using Microsoft.AspNetCore.Identity;
using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
using PowderCoating.Application.Interfaces;
using PowderCoating.Core.Entities;
using PowderCoating.Infrastructure.Data;
using PowderCoating.Shared.Constants;

namespace PowderCoating.Infrastructure.Services;

public partial class SeedDataService : ISeedDataService
{
    private readonly ApplicationDbContext _context;
    private readonly UserManager<ApplicationUser> _userManager;
    private readonly RoleManager<IdentityRole> _roleManager;

    public SeedDataService(
        ApplicationDbContext context,
        UserManager<ApplicationUser> userManager,
        RoleManager<IdentityRole> roleManager)
    {
        _context = context;
        _userManager = userManager;
        _roleManager = roleManager;
    }

    /// <summary>
    /// Extracts a human-readable error message from a <see cref="DbUpdateException"/>,
    /// decoding SQL Server error codes into plain language.
    /// </summary>
    /// <remarks>
    /// SQL Server error 2601/2627 = unique-constraint violation; 547 = foreign-key violation.
    /// The method tries to pull the constraint name and duplicate key value out of the raw
    /// SQL message so the Platform Management UI can surface a meaningful alert instead of a
    /// stack-trace dump.  Falls back to a generic message for any other exception type.
    /// </remarks>
    /// <param name="ex">The exception thrown by <c>SaveChangesAsync</c>.</param>
    /// <param name="entityName">Friendly name of the entity being saved, used in fallback messages.</param>
    /// <returns>A single-sentence, user-readable error description.</returns>
    private string GetFriendlyErrorMessage(Exception ex, string entityName = "record")
    {
        if (ex is DbUpdateException dbEx && dbEx.InnerException is SqlException sqlEx)
        {
            // Extract the specific constraint or column information
            var message = sqlEx.Message;

            // Handle unique constraint violations (Error 2601 or 2627)
            if (sqlEx.Number == 2601 || sqlEx.Number == 2627)
            {
                // Try to extract the duplicate key value
                var keyStart = message.IndexOf("The duplicate key value is (");
                if (keyStart > 0)
                {
                    var keyEnd = message.IndexOf(").", keyStart);
                    if (keyEnd > keyStart)
                    {
                        var duplicateValue = message.Substring(keyStart + 28, keyEnd - keyStart - 28);

                        // Try to extract the constraint name
                        var constraintStart = message.IndexOf("'IX_");
                        if (constraintStart > 0)
                        {
                            var constraintEnd = message.IndexOf("'", constraintStart + 1);
                            if (constraintEnd > constraintStart)
                            {
                                var constraintName = message.Substring(constraintStart + 1, constraintEnd - constraintStart - 1);

                                // Extract field name from constraint (e.g., IX_Customers_Email -> Email)
                                var parts = constraintName.Split('_');
                                if (parts.Length >= 3)
                                {
                                    var fieldName = parts[2];
                                    return $"Duplicate {fieldName}: {duplicateValue} already exists";
                                }
                            }
                        }

                        return $"Duplicate value {duplicateValue} already exists";
                    }
                }

                return $"A {entityName} with this information already exists in the database";
            }

            // Handle foreign key constraint violations (Error 547)
            if (sqlEx.Number == 547)
            {
                if (message.Contains("FOREIGN KEY"))
                {
                    return $"Cannot add {entityName}: Referenced data does not exist";
                }
            }

            // Handle other SQL errors
            return $"Database error: {message.Split('\n')[0]}";
        }

        // Generic exception
        return $"Error adding {entityName}: {ex.Message}";
    }

    /// <summary>
    /// Returns all non-deleted companies in the platform, ordered by name.
    /// </summary>
    /// <remarks>
    /// Uses <c>IgnoreQueryFilters</c> so that the global multi-tenancy filter (which would
    /// otherwise restrict results to the current tenant) is bypassed — this method is called
    /// from the SuperAdmin Platform Management UI and must see every tenant.
    /// Soft-deleted companies are excluded explicitly via <c>!c.IsDeleted</c>.
    /// </remarks>
    public async Task<List<Company>> GetCompaniesAsync()
    {
        return await _context.Companies
            .IgnoreQueryFilters()
            .Where(c => !c.IsDeleted)
            .OrderBy(c => c.CompanyName)
            .ToListAsync();
    }

    /// <summary>
    /// Seeds platform-wide, one-time system data: the default DEMO company, ASP.NET Identity
    /// roles, the break-glass SuperAdmin account, manufacturer lookup patterns, and release notes.
    /// </summary>
    /// <remarks>
    /// This method is called manually via Platform Management → Seed Data and is safe to call
    /// repeatedly — each sub-seeder checks for existing records before inserting.
    /// It is intentionally NOT called automatically on startup so that platform operators
    /// control when the database is initialized.
    /// Individual sub-seeders are called sequentially; a failure in one does not abort the rest
    /// because each is try/caught internally.
    /// </remarks>
    /// <returns>
    /// A <see cref="SeedDataResult"/> summarising what was created, with
    /// <see cref="SeedDataResult.Success"/> = <c>false</c> only if an unrecoverable error occurs.
    /// </returns>
    public async Task<SeedDataResult> SeedSystemDataAsync()
    {
        var result = new SeedDataResult { Success = true };
        var details = new List<string>();

        try
        {
            // Seed default company
            var defaultCompany = await SeedDefaultCompanyAsync();
            if (defaultCompany != null)
            {
                details.Add("✓ Default company created/verified");
                result.ItemsSeeded++;
            }

            // Seed roles
            var rolesCreated = await SeedRolesAsync();
            if (rolesCreated > 0)
            {
                details.Add($"✓ {rolesCreated} role(s) created");
                result.ItemsSeeded += rolesCreated;
            }

            // Seed SuperAdmin users
            var adminsCreated = await SeedSuperAdminUsersAsync(defaultCompany!);
            if (adminsCreated > 0)
            {
                details.Add($"✓ {adminsCreated} SuperAdmin user(s) created");
                result.ItemsSeeded += adminsCreated;
            }

            // Seed global manufacturer lookup patterns
            var patternsSeeded = await SeedManufacturerPatternsAsync();
            if (patternsSeeded > 0)
            {
                details.Add($"✓ {patternsSeeded} manufacturer lookup pattern(s) created");
                result.ItemsSeeded += patternsSeeded;
            }

            // Seed release notes
            var notesSeeded = await SeedReleaseNotesAsync();
            if (notesSeeded > 0)
            {
                details.Add($"✓ {notesSeeded} release note(s) created");
                result.ItemsSeeded += notesSeeded;
            }

            result.Details = details;
            result.Message = "System data seeded successfully";
        }
        catch (Exception ex)
        {
            result.Success = false;
            result.Message = $"Error seeding system data: {ex.Message}";
        }

        return result;
    }

    /// <summary>
    /// Seeds the minimum required lookup tables for a newly created company: job statuses,
    /// job priorities, quote statuses, appointment statuses/types, inventory categories,
    /// prep services, and the default chart of accounts.
    /// </summary>
    /// <remarks>
    /// This is called automatically by the company-creation workflow (not manually) to ensure
    /// every new tenant has valid lookup data before any jobs or quotes are created.
    /// It intentionally seeds only lookups — not demo data — so the company starts clean.
    /// Each sub-seeder is idempotent: it checks for existing rows before inserting.
    /// </remarks>
    /// <param name="companyId">The primary key of the company to initialise.</param>
    /// <returns>
    /// A <see cref="SeedDataResult"/> listing which tables were populated.
    /// Returns a failure result if the company is not found.
    /// </returns>
    public async Task<SeedDataResult> SeedCompanyLookupsAsync(int companyId)
    {
        var result = new SeedDataResult { Success = true };
        var details = new List<string>();

        try
        {
            var company = await _context.Companies
                .IgnoreQueryFilters()
                .FirstOrDefaultAsync(c => c.Id == companyId && !c.IsDeleted);

            if (company == null)
            {
                result.Success = false;
                result.Message = "Company not found";
                return result;
            }

            // Seed lookup tables
            var jobStatusesSeeded = await SeedJobStatusLookupsAsync(company);
            if (jobStatusesSeeded > 0)
            {
                details.Add($"✓ {jobStatusesSeeded} job status(es) created");
                result.ItemsSeeded += jobStatusesSeeded;
            }

            var jobPrioritiesSeeded = await SeedJobPriorityLookupsAsync(company);
            if (jobPrioritiesSeeded > 0)
            {
                details.Add($"✓ {jobPrioritiesSeeded} job priority/priorities created");
                result.ItemsSeeded += jobPrioritiesSeeded;
            }

            var quoteStatusesSeeded = await SeedQuoteStatusLookupsAsync(company);
            if (quoteStatusesSeeded > 0)
            {
                details.Add($"✓ {quoteStatusesSeeded} quote status(es) created");
                result.ItemsSeeded += quoteStatusesSeeded;
            }

            var appointmentStatusesSeeded = await SeedAppointmentStatusLookupsAsync(company);
            if (appointmentStatusesSeeded > 0)
            {
                details.Add($"✓ {appointmentStatusesSeeded} appointment status(es) created");
                result.ItemsSeeded += appointmentStatusesSeeded;
            }

            var appointmentTypesSeeded = await SeedAppointmentTypeLookupsAsync(company);
            if (appointmentTypesSeeded > 0)
            {
                details.Add($"✓ {appointmentTypesSeeded} appointment type(s) created");
                result.ItemsSeeded += appointmentTypesSeeded;
            }

            var inventoryCategoriesSeeded = await SeedInventoryCategoryLookupsAsync(company);
            if (inventoryCategoriesSeeded > 0)
            {
                details.Add($"✓ {inventoryCategoriesSeeded} inventory category/categories created");
                result.ItemsSeeded += inventoryCategoriesSeeded;
            }

            var prepServicesSeeded = await SeedPrepServicesAsync(company);
            if (prepServicesSeeded > 0)
            {
                details.Add($"✓ {prepServicesSeeded} prep service(s) created");
                result.ItemsSeeded += prepServicesSeeded;
            }

            var accountsSeeded = await SeedDefaultChartOfAccountsAsync(company);
            if (accountsSeeded > 0)
            {
                details.Add($"✓ {accountsSeeded} chart of account(s) created");
                result.ItemsSeeded += accountsSeeded;
            }

            // Backfill any system accounts added after the initial seed (idempotent).
            var systemAccountsAdded = await EnsureSystemAccountsAsync(company);
            if (systemAccountsAdded > 0)
            {
                details.Add($"✓ {systemAccountsAdded} missing system account(s) added");
                result.ItemsSeeded += systemAccountsAdded;
            }

            result.Message = $"Lookup tables initialized for {company.CompanyName}";
            result.Details = details;
        }
        catch (Exception ex)
        {
            result.Success = false;
            result.Message = $"Error seeding lookup tables: {ex.Message}";
        }

        return result;
    }

    /// <summary>
    /// Seeds a full set of demo data for the specified company: lookup tables, inventory,
    /// operating costs, pricing tiers, customers, equipment, vendors, named ovens, catalog
    /// items, quotes, jobs, job history, inventory transactions, invoices, vendor bills,
    /// expenses, and appointments. Also seeds demo user accounts when the company code is "DEMO".
    /// </summary>
    /// <remarks>
    /// Triggered manually via Platform Management → Seed Data; never called on startup.
    /// Each sub-seeder is wrapped in its own try/catch so that one failure (e.g., a duplicate
    /// SKU) does not prevent the remaining seeders from running — errors are collected into
    /// <see cref="SeedDataResult.Warnings"/> and reported at the end.
    /// The EF ChangeTracker is cleared after each failure so bad entity state does not bleed
    /// into subsequent seeders.
    /// Inventory items and customers use a separate tuple-returning path because they can
    /// produce per-item warnings (e.g., duplicate SKU) rather than an all-or-nothing result.
    /// </remarks>
    /// <param name="companyId">The primary key of the company to seed.</param>
    /// <returns>
    /// A <see cref="SeedDataResult"/> summarising counts, warnings, and any errors.
    /// <see cref="SeedDataResult.Success"/> is always <c>true</c>; errors appear in Warnings.
    /// </returns>
    public async Task<SeedDataResult> SeedCompanyDataAsync(int companyId)
    {
        var result = new SeedDataResult { Success = true };
        var details = new List<string>();
        var errors = new List<string>();

        var company = await _context.Companies
            .IgnoreQueryFilters()
            .FirstOrDefaultAsync(c => c.Id == companyId && !c.IsDeleted);

        if (company == null)
        {
            result.Success = false;
            result.Message = "Company not found";
            return result;
        }

        // Each seeder is wrapped in its own try/catch so one failure doesn't
        // abort the rest. Re-running is safe — each seeder checks for existing
        // data before inserting.

        await RunSeeder("Job statuses",       details, errors, result,
            () => SeedJobStatusLookupsAsync(company));
        await RunSeeder("Job priorities",     details, errors, result,
            () => SeedJobPriorityLookupsAsync(company));
        await RunSeeder("Quote statuses",     details, errors, result,
            () => SeedQuoteStatusLookupsAsync(company));
        await RunSeeder("Inventory categories", details, errors, result,
            () => SeedInventoryCategoryLookupsAsync(company));
        await RunSeeder("Appointment statuses", details, errors, result,
            () => SeedAppointmentStatusLookupsAsync(company));
        await RunSeeder("Appointment types",  details, errors, result,
            () => SeedAppointmentTypeLookupsAsync(company));

        // Inventory items (returns tuple — handle separately)
        try
        {
            var (inventorySeeded, inventoryWarnings) = await SeedInventoryItemsAsync(company);
            if (inventorySeeded > 0)
            {
                details.Add($"✓ {inventorySeeded} inventory item(s) created");
                result.ItemsSeeded += inventorySeeded;
            }
            else if (inventoryWarnings.Count == 0)
            {
                details.Add("• Inventory items already exist (skipped)");
            }
            if (inventoryWarnings.Any())
            {
                result.Warnings.AddRange(inventoryWarnings);
                result.ItemsSkipped += inventoryWarnings.Count;
            }
        }
        catch (Exception ex) { errors.Add($"✗ Inventory items: {ex.Message}"); _context.ChangeTracker.Clear(); }

        // Operating costs (returns bool)
        try
        {
            var costsSeeded = await SeedOperatingCostsAsync(company);
            details.Add(costsSeeded ? "✓ Operating costs created" : "• Operating costs already exist (skipped)");
            if (costsSeeded) result.ItemsSeeded++;
        }
        catch (Exception ex) { errors.Add($"✗ Operating costs: {ex.Message}"); _context.ChangeTracker.Clear(); }

        await RunSeeder("Pricing tiers",  details, errors, result, () => SeedPricingTiersAsync(company));

        // Customers (returns tuple)
        try
        {
            var (customersSeeded, customerWarnings) = await SeedCustomersAsync(company);
            if (customersSeeded > 0)
            {
                details.Add($"✓ {customersSeeded} customer(s) created");
                result.ItemsSeeded += customersSeeded;
            }
            else if (customerWarnings.Count == 0)
            {
                details.Add("• Customers already exist (skipped)");
            }
            if (customerWarnings.Any())
            {
                result.Warnings.AddRange(customerWarnings);
                result.ItemsSkipped += customerWarnings.Count;
            }
        }
        catch (Exception ex) { errors.Add($"✗ Customers: {ex.Message}"); _context.ChangeTracker.Clear(); }

        await RunSeeder("Equipment",      details, errors, result, () => SeedEquipmentAsync(company));
        await RunSeeder("Vendors",        details, errors, result, () => SeedVendorsAsync(company));
        await RunSeeder("Named ovens",    details, errors, result, () => SeedOvenCostsAsync(company));
        await RunSeeder("Catalog",        details, errors, result, () => SeedCatalogAsync(company));
        await RunSeeder("Quotes",         details, errors, result, () => SeedQuotesAsync(company));
        await RunSeeder("Jobs",           details, errors, result, () => SeedJobsAsync(company));
        await RunSeeder("Job history",    details, errors, result, () => SeedJobStatusHistoryAsync(company));
        await RunSeeder("Inv. txns",      details, errors, result, () => SeedInventoryTransactionsAsync(company));
        await RunSeeder("Invoices",       details, errors, result, () => SeedInvoicesAsync(company));
        await RunSeeder("Vendor bills",   details, errors, result, () => SeedBillsAsync(company));
        await RunSeeder("Expenses",       details, errors, result, () => SeedExpensesAsync(company));
        await RunSeeder("Appointments",   details, errors, result, () => SeedAppointmentsAsync(company));

        if (company.CompanyCode == "DEMO")
        {
            try
            {
                var demoUsersCreated = await SeedDemoCompanyUsersAsync(company);
                details.Add(demoUsersCreated > 0
                    ? $"✓ {demoUsersCreated} demo user(s) created"
                    : "• Demo users already exist (skipped)");
                result.ItemsSeeded += demoUsersCreated;
            }
            catch (Exception ex) { errors.Add($"✗ Demo users: {ex.Message}"); _context.ChangeTracker.Clear(); }
        }

        if (errors.Any())
        {
            details.AddRange(errors);
            result.Warnings.AddRange(errors);
            result.Message = $"Seeding completed with {errors.Count} error(s) for {company.CompanyName}. Re-run to retry failed steps.";
        }
        else
        {
            result.Message = $"Company data seeded successfully for {company.CompanyName}";
        }

        result.Details = details;
        return result;
    }

    /// <summary>
    /// Executes a single seeder delegate that returns an integer count of rows created,
    /// appending a success or skip message to <paramref name="details"/> and accumulating
    /// any exception into <paramref name="errors"/>.
    /// </summary>
    /// <remarks>
    /// This helper exists so that <see cref="SeedCompanyDataAsync"/> can call every
    /// count-returning seeder with uniform error isolation in a single line of code.
    /// When the seeder throws, the EF ChangeTracker is cleared immediately to prevent
    /// partially-tracked entities from corrupting the context state for subsequent seeders.
    /// Seeders that return a tuple (e.g., inventory items, customers) are not routed through
    /// here because they need to surface per-item warnings rather than a single count.
    /// </remarks>
    /// <param name="label">Short display name used in status messages (e.g., "Job statuses").</param>
    /// <param name="details">Running list of success/skip lines shown in the UI result.</param>
    /// <param name="errors">Running list of error lines appended on exception.</param>
    /// <param name="result">The overall result object whose <c>ItemsSeeded</c> is incremented on success.</param>
    /// <param name="seeder">The seeder delegate to invoke.</param>
    private async Task RunSeeder(
        string label,
        List<string> details,
        List<string> errors,
        SeedDataResult result,
        Func<Task<int>> seeder)
    {
        try
        {
            var count = await seeder();
            details.Add(count > 0
                ? $"✓ {count} {label.ToLower()} created"
                : $"• {label} already exist (skipped)");
            result.ItemsSeeded += count;
        }
        catch (Exception ex)
        {
            errors.Add($"✗ {label}: {ex.Message}");
            // Clear the change tracker so EF doesn't carry over bad state to the next seeder
            _context.ChangeTracker.Clear();
        }
    }

    /// <summary>
    /// Ensures the platform's default "DEMO" company exists, creating it if not found.
    /// </summary>
    /// <remarks>
    /// The DEMO company is the anchor tenant used by seeded SuperAdmin accounts and demo data.
    /// After inserting, <c>CompanyId</c> is set equal to <c>Id</c> — this is intentional:
    /// the Company entity doubles as a BaseEntity tenant and must reference itself so that
    /// global query filters (which filter on CompanyId) do not accidentally exclude the record.
    /// Returns <c>null</c> (not a new object) when the company already exists, which lets
    /// <see cref="SeedSystemDataAsync"/> distinguish "created" from "already present".
    /// </remarks>
    /// <returns>The newly created <see cref="Company"/>, or <c>null</c> if it already existed.</returns>
    private async Task<Company?> SeedDefaultCompanyAsync()
    {
        var defaultCompany = await _context.Companies
            .IgnoreQueryFilters()
            .FirstOrDefaultAsync(c => c.CompanyCode == "DEMO");

        if (defaultCompany == null)
        {
            defaultCompany = new Company
            {
                CompanyName = "Demo Company",
                CompanyCode = "DEMO",
                PrimaryContactName = "Admin User",
                PrimaryContactEmail = "admin@demo.com",
                Phone = "(555) 123-4567",
                Address = "123 Demo Street",
                City = "Demo City",
                State = "CA",
                ZipCode = "90210",
                IsActive = true,
                SubscriptionStartDate = DateTime.UtcNow,
                SubscriptionPlan = 2, // Enterprise
                TimeZone = "America/New_York",
                CreatedAt = DateTime.UtcNow,
                CompanyId = 0
            };

            await _context.Companies.AddAsync(defaultCompany);
            await _context.SaveChangesAsync();

            defaultCompany.CompanyId = defaultCompany.Id;
            await _context.SaveChangesAsync();

            return defaultCompany;
        }

        return null;
    }

    /// <summary>
    /// Ensures all six ASP.NET Identity application roles exist:
    /// SuperAdmin, Administrator, Manager, Employee, ShopFloor, and ReadOnly.
    /// </summary>
    /// <remarks>
    /// Roles are checked individually via <see cref="RoleManager{TRole}.RoleExistsAsync"/>
    /// rather than in bulk so that this method can be re-run safely without duplicates.
    /// Role names are sourced from <see cref="AppConstants.Roles"/> to keep them in sync
    /// with authorization policies defined throughout the application.
    /// </remarks>
    /// <returns>The number of new roles created (0 if all already existed).</returns>
    private async Task<int> SeedRolesAsync()
    {
        string[] roles = new[]
        {
            AppConstants.Roles.SuperAdmin,
            AppConstants.Roles.Administrator,
            AppConstants.Roles.Manager,
            AppConstants.Roles.Employee,
            AppConstants.Roles.ShopFloor,
            AppConstants.Roles.ReadOnly
        };

        int created = 0;
        foreach (var role in roles)
        {
            if (!await _roleManager.RoleExistsAsync(role))
            {
                await _roleManager.CreateAsync(new IdentityRole(role));
                created++;
            }
        }

        return created;
    }

    /// <summary>
    /// Ensures the primary break-glass SuperAdmin account exists
    /// (<c>artemis@powdercoatinglogix.com</c>).
    /// </summary>
    /// <remarks>
    /// This account is the "break glass" owner account — intentional guards in
    /// <c>PlatformUsersController</c> prevent it from being deleted or demoted.
    /// It is assigned to the default DEMO company but has <c>CompanyRole = null</c>,
    /// which is the signal used by the multi-tenancy middleware to grant cross-company access.
    /// All granular permission flags are set to <c>true</c> because SuperAdmin must be able
    /// to perform any operation on behalf of any tenant for support purposes.
    /// Additional SuperAdmin accounts can be created via Platform Management → Platform Users.
    /// </remarks>
    /// <param name="defaultCompany">The DEMO company the account is anchored to.</param>
    /// <returns>The number of new SuperAdmin users created (0 or 1).</returns>
    private async Task<int> SeedSuperAdminUsersAsync(Company defaultCompany)
    {
        int created = 0;

        // SuperAdmin 1
        const string superAdminEmail = "artemis@powdercoatinglogix.com";
        const string superAdminPassword = "SuperAdmin123!";

        var superAdmin = await _userManager.FindByEmailAsync(superAdminEmail);
        if (superAdmin == null)
        {
            superAdmin = new ApplicationUser
            {
                UserName = superAdminEmail,
                Email = superAdminEmail,
                FirstName = "Artemis",
                LastName = "PCL",
                EmployeeNumber = "SA-001",
                EmailConfirmed = true,
                HireDate = DateTime.UtcNow,
                IsActive = true,
                Department = "Platform",
                Position = "Super Administrator",
                CompanyId = defaultCompany.Id,
                CompanyRole = null,
                CanManageJobs = true,
                CanManageInventory = true,
                CanManageCustomers = true,
                CanCreateQuotes = true,
                CanApproveQuotes = true,
                CanManageCalendar = true,
                CanManageProducts = true,
                CanManageEquipment = true,
                CanManageVendors = true,
                CanManageMaintenance = true
            };

            var result = await _userManager.CreateAsync(superAdmin, superAdminPassword);
            if (result.Succeeded)
            {
                await _userManager.AddToRoleAsync(superAdmin, AppConstants.Roles.SuperAdmin);
                created++;
            }
        }

        return created;
    }

    /// <summary>
    /// Seeds demo login accounts for the DEMO company: a Company Administrator
    /// (<c>demo@powdercoatinglogix.com</c>) and a Manager (<c>manager@demo.com</c>).
    /// </summary>
    /// <remarks>
    /// Only called when <c>company.CompanyCode == "DEMO"</c> — other tenants do not get
    /// pre-seeded user accounts because their operators create real users themselves.
    /// The Company Administrator mirrors real-world usage: all permissions enabled,
    /// <c>CompanyRole = CompanyAdmin</c>, system role = Administrator.
    /// The Manager account intentionally has <c>CanApproveQuotes = false</c> to demonstrate
    /// the role-based permission model in the demo environment.
    /// </remarks>
    /// <param name="company">The DEMO company record.</param>
    /// <returns>The number of new user accounts created (0–2).</returns>
    private async Task<int> SeedDemoCompanyUsersAsync(Company company)
    {
        int created = 0;

        // Company Admin
        const string companyAdminEmail = "demo@powdercoatinglogix.com";
        const string companyAdminPassword = "CompanyAdmin123!";

        var companyAdmin = await _userManager.FindByEmailAsync(companyAdminEmail);
        if (companyAdmin == null)
        {
            companyAdmin = new ApplicationUser
            {
                UserName = companyAdminEmail,
                Email = companyAdminEmail,
                FirstName = "Demo",
                LastName = "User",
                EmployeeNumber = "CA-001",
                EmailConfirmed = true,
                HireDate = DateTime.UtcNow,
                IsActive = true,
                Department = "Management",
                Position = "Company Administrator",
                CompanyId = company.Id,
                CompanyRole = AppConstants.CompanyRoles.CompanyAdmin,
                CanManageJobs = true,
                CanManageInventory = true,
                CanManageCustomers = true,
                CanCreateQuotes = true,
                CanApproveQuotes = true,
                CanManageCalendar = true,
                CanManageProducts = true,
                CanManageEquipment = true,
                CanManageVendors = true,
                CanManageMaintenance = true
            };

            var result = await _userManager.CreateAsync(companyAdmin, companyAdminPassword);
            if (result.Succeeded)
            {
                await _userManager.AddToRoleAsync(companyAdmin, AppConstants.Roles.Administrator);
                created++;
            }
        }

        // Manager
        const string managerEmail = "manager@demo.com";
        const string managerPassword = "Manager123!";

        var manager = await _userManager.FindByEmailAsync(managerEmail);
        if (manager == null)
        {
            manager = new ApplicationUser
            {
                UserName = managerEmail,
                Email = managerEmail,
                FirstName = "Demo",
                LastName = "Manager",
                EmployeeNumber = "MGR-001",
                EmailConfirmed = true,
                HireDate = DateTime.UtcNow,
                IsActive = true,
                Department = "Operations",
                Position = "Operations Manager",
                CompanyId = company.Id,
                CompanyRole = AppConstants.CompanyRoles.Manager,
                CanManageJobs = true,
                CanManageInventory = true,
                CanManageCustomers = true,
                CanCreateQuotes = true,
                CanApproveQuotes = false
            };

            var result = await _userManager.CreateAsync(manager, managerPassword);
            if (result.Succeeded)
            {
                await _userManager.AddToRoleAsync(manager, AppConstants.Roles.Manager);
                created++;
            }
        }

        return created;
    }

    /// <summary>
    /// Seeds ten representative inventory items (eight powder colours, one cleaner, one
    /// masking tape roll) for the company, linking each to the appropriate category lookup.
    /// </summary>
    /// <remarks>
    /// Returns a tuple rather than a plain int because each item is saved individually
    /// (one <c>SaveChangesAsync</c> call per item) so that a duplicate-SKU error on one
    /// item does not roll back the entire batch.  Failed items are captured as per-item
    /// warning strings rather than aborting the seeder.
    ///
    /// SKUs are prefixed with the company's <see cref="Company.CompanyCode"/> to guarantee
    /// uniqueness across tenants in a shared database — e.g., <c>DEMO-PWD-BLK-001</c>.
    /// A missing or empty CompanyCode throws <see cref="InvalidOperationException"/> because
    /// SKU collisions would violate the unique index on the InventoryItems table.
    ///
    /// Category IDs are resolved by <c>CategoryCode</c> (e.g., "POWDER", "CLEANER") rather
    /// than hard-coded IDs because lookup IDs differ per company and per environment.
    ///
    /// All powder items default to <c>CoverageSqFtPerLb = 30</c> and
    /// <c>TransferEfficiency = 65</c>, which are industry-standard starting values used by
    /// the pricing engine when calculating powder needed per coat.
    /// </remarks>
    /// <param name="company">The tenant company to seed inventory for.</param>
    /// <returns>
    /// A tuple of (count of items successfully inserted, list of per-item warning messages
    /// for skipped or failed items).
    /// </returns>
    private async Task<(int seededCount, List<string> warnings)> SeedInventoryItemsAsync(Company company)
    {
        var warnings = new List<string>();
        int seededCount = 0;

        // Validate company code
        if (string.IsNullOrWhiteSpace(company.CompanyCode))
        {
            throw new InvalidOperationException($"Company {company.CompanyName} (ID: {company.Id}) has no CompanyCode. Cannot seed inventory with unique SKUs.");
        }

        var skuPrefix = company.CompanyCode;

        // Get category lookups to link items properly
        var categories = await _context.InventoryCategoryLookups
            .IgnoreQueryFilters()
            .Where(c => c.CompanyId == company.Id && !c.IsDeleted)
            .ToListAsync();

        var powderCategory = categories.FirstOrDefault(c => c.CategoryCode == "POWDER");
        var cleanerCategory = categories.FirstOrDefault(c => c.CategoryCode == "CLEANER");
        var maskingCategory = categories.FirstOrDefault(c => c.CategoryCode == "MASKING");

        // Use company code prefix to ensure unique SKUs across companies

        var inventoryItems = new List<InventoryItem>
        {
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-BLK-001",
                Name = "Matte Black Powder",
                Description = "High-quality matte black powder coating",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Matte Black",
                ColorCode = "RAL 9005",
                Finish = "Matte",
                Manufacturer = "Tiger Drylac",
                ManufacturerPartNumber = "TG-MB-001",
                QuantityOnHand = 500,
                UnitOfMeasure = "lbs",
                ReorderPoint = 100,
                ReorderQuantity = 250,
                MinimumStock = 50,
                MaximumStock = 1000,
                UnitCost = 4.50m,
                AverageCost = 4.50m,
                LastPurchasePrice = 4.50m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-30),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-WHT-001",
                Name = "Gloss White Powder",
                Description = "High-gloss white powder coating",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Gloss White",
                ColorCode = "RAL 9010",
                Finish = "Gloss",
                Manufacturer = "Tiger Drylac",
                ManufacturerPartNumber = "TG-GW-001",
                QuantityOnHand = 400,
                UnitOfMeasure = "lbs",
                ReorderPoint = 100,
                ReorderQuantity = 250,
                MinimumStock = 50,
                MaximumStock = 1000,
                UnitCost = 4.25m,
                AverageCost = 4.25m,
                LastPurchasePrice = 4.25m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-25),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-RED-001",
                Name = "Gloss Red Powder",
                Description = "Vibrant gloss red powder coating",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Traffic Red",
                ColorCode = "RAL 3020",
                Finish = "Gloss",
                Manufacturer = "Tiger Drylac",
                ManufacturerPartNumber = "TG-GR-001",
                QuantityOnHand = 150,
                UnitOfMeasure = "lbs",
                ReorderPoint = 50,
                ReorderQuantity = 100,
                MinimumStock = 25,
                MaximumStock = 500,
                UnitCost = 5.75m,
                AverageCost = 5.75m,
                LastPurchasePrice = 5.75m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-20),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-BLU-001",
                Name = "Metallic Blue Powder",
                Description = "Metallic blue powder coating with shimmer",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Metallic Blue",
                ColorCode = "RAL 5002",
                Finish = "Metallic",
                Manufacturer = "Axalta",
                ManufacturerPartNumber = "AX-MB-001",
                QuantityOnHand = 200,
                UnitOfMeasure = "lbs",
                ReorderPoint = 75,
                ReorderQuantity = 150,
                MinimumStock = 25,
                MaximumStock = 500,
                UnitCost = 6.25m,
                AverageCost = 6.25m,
                LastPurchasePrice = 6.25m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-15),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-GRY-001",
                Name = "Textured Gray Powder",
                Description = "Textured gray powder coating for industrial use",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Textured Gray",
                ColorCode = "RAL 7037",
                Finish = "Textured",
                Manufacturer = "Axalta",
                ManufacturerPartNumber = "AX-TG-001",
                QuantityOnHand = 300,
                UnitOfMeasure = "lbs",
                ReorderPoint = 75,
                ReorderQuantity = 150,
                MinimumStock = 50,
                MaximumStock = 600,
                UnitCost = 5.00m,
                AverageCost = 5.00m,
                LastPurchasePrice = 5.00m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-10),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-YEL-001",
                Name = "Safety Yellow Powder",
                Description = "High-visibility safety yellow powder coating",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Safety Yellow",
                ColorCode = "RAL 1003",
                Finish = "Gloss",
                Manufacturer = "Tiger Drylac",
                ManufacturerPartNumber = "TG-SY-001",
                QuantityOnHand = 125,
                UnitOfMeasure = "lbs",
                ReorderPoint = 50,
                ReorderQuantity = 100,
                MinimumStock = 25,
                MaximumStock = 400,
                UnitCost = 5.50m,
                AverageCost = 5.50m,
                LastPurchasePrice = 5.50m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-5),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-ORG-001",
                Name = "Orange Powder",
                Description = "Bright orange powder coating",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Pure Orange",
                ColorCode = "RAL 2004",
                Finish = "Gloss",
                Manufacturer = "Axalta",
                ManufacturerPartNumber = "AX-PO-001",
                QuantityOnHand = 100,
                UnitOfMeasure = "lbs",
                ReorderPoint = 40,
                ReorderQuantity = 80,
                MinimumStock = 20,
                MaximumStock = 300,
                UnitCost = 5.85m,
                AverageCost = 5.85m,
                LastPurchasePrice = 5.85m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-12),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-PWD-GRN-001",
                Name = "Forest Green Powder",
                Description = "Deep forest green powder coating",
                Category = "Powder",
                InventoryCategoryId = powderCategory?.Id,
                ColorName = "Forest Green",
                ColorCode = "RAL 6009",
                Finish = "Matte",
                Manufacturer = "Tiger Drylac",
                ManufacturerPartNumber = "TG-FG-001",
                QuantityOnHand = 175,
                UnitOfMeasure = "lbs",
                ReorderPoint = 60,
                ReorderQuantity = 120,
                MinimumStock = 30,
                MaximumStock = 400,
                UnitCost = 5.25m,
                AverageCost = 5.25m,
                LastPurchasePrice = 5.25m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-8),
                CoverageSqFtPerLb = 30m,
                TransferEfficiency = 65m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-CLN-001",
                Name = "Pre-Treatment Cleaner",
                Description = "Industrial degreaser and cleaner",
                Category = "Cleaner",
                InventoryCategoryId = cleanerCategory?.Id,
                QuantityOnHand = 50,
                UnitOfMeasure = "gallons",
                ReorderPoint = 10,
                ReorderQuantity = 25,
                MinimumStock = 5,
                MaximumStock = 100,
                UnitCost = 12.50m,
                AverageCost = 12.50m,
                LastPurchasePrice = 12.50m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-20),
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new InventoryItem
            {
                SKU = $"{skuPrefix}-MSK-001",
                Name = "High-Temp Masking Tape",
                Description = "Heat-resistant masking tape for powder coating",
                Category = "Masking",
                InventoryCategoryId = maskingCategory?.Id,
                QuantityOnHand = 200,
                UnitOfMeasure = "rolls",
                ReorderPoint = 50,
                ReorderQuantity = 100,
                MinimumStock = 25,
                MaximumStock = 500,
                UnitCost = 8.75m,
                AverageCost = 8.75m,
                LastPurchasePrice = 8.75m,
                LastPurchaseDate = DateTime.UtcNow.AddDays(-15),
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            }
        };

        // Add inventory items one at a time to handle duplicates gracefully
        foreach (var item in inventoryItems)
        {
            try
            {
                // Check if item already exists by SKU
                var existingItem = await _context.InventoryItems
                    .IgnoreQueryFilters()
                    .FirstOrDefaultAsync(i => i.SKU == item.SKU && i.CompanyId == company.Id);

                if (existingItem != null)
                {
                    warnings.Add($"⊘ Skipped: {item.Name} (SKU: {item.SKU}) - Already exists");
                    continue;
                }

                await _context.InventoryItems.AddAsync(item);
                await _context.SaveChangesAsync();
                seededCount++;
            }
            catch (Exception ex)
            {
                var friendlyError = GetFriendlyErrorMessage(ex, "inventory item");
                warnings.Add($"⊘ Skipped: {item.Name} (SKU: {item.SKU}) - {friendlyError}");

                // Detach the failed entity
                if (_context.Entry(item).State != EntityState.Detached)
                {
                    _context.Entry(item).State = EntityState.Detached;
                }
            }
        }

        return (seededCount, warnings);
    }

    /// <summary>
    /// Creates a single <see cref="CompanyOperatingCosts"/> record for the company with
    /// industry-typical default rates if none exists yet.
    /// </summary>
    /// <remarks>
    /// There is a 1:1 relationship between a company and its operating costs record, so the
    /// seeder checks for any existing row (ignoring soft-deletes) and skips creation if found.
    /// The default values — $25/hr labour, $15/hr oven, 30% markup, 7.5% tax — are reasonable
    /// starting points that operators are expected to customise through Company Settings.
    /// The <c>OvenOperatingCostPerHour</c> here may later be overwritten by
    /// <see cref="SeedOvenCostsAsync"/> if it finds the value is still 0.
    /// </remarks>
    /// <param name="company">The tenant company to create operating costs for.</param>
    /// <returns><c>true</c> if a new record was created; <c>false</c> if one already existed.</returns>
    private async Task<bool> SeedOperatingCostsAsync(Company company)
    {
        var existingCosts = await _context.CompanyOperatingCosts
            .IgnoreQueryFilters()
            .FirstOrDefaultAsync(c => c.CompanyId == company.Id && !c.IsDeleted);

        if (existingCosts != null)
        {
            return false;
        }

        var operatingCosts = new CompanyOperatingCosts
        {
            CompanyId = company.Id,
            StandardLaborRate = 25.00m,
            OvenOperatingCostPerHour = 15.00m,
            SandblasterCostPerHour = 12.00m,
            CoatingBoothCostPerHour = 10.00m,
            PowderCoatingCostPerSqFt = 0.85m,
            GeneralMarkupPercentage = 30.00m,
            TaxPercent = 7.50m,
            RushChargeType = "Percentage",
            RushChargePercentage = 25.00m,
            RushChargeFixedAmount = 0m,
            CreatedAt = DateTime.UtcNow
        };

        await _context.CompanyOperatingCosts.AddAsync(operatingCosts);
        await _context.SaveChangesAsync();

        return true;
    }

    /// <summary>
    /// Seeds four customer pricing tiers (Standard, Silver, Gold, Platinum) with discount
    /// percentages of 0%, 5%, 10%, and 15% respectively, if none exist for the company.
    /// </summary>
    /// <remarks>
    /// Pricing tiers drive the automatic discount applied to quotes when a customer belongs
    /// to a tier — the pricing engine reads <c>PricingTier.DiscountPercent</c> at quote-
    /// calculation time.  The Standard tier at 0% acts as the default "no discount" tier.
    /// All four tiers are inserted in a single <c>AddRangeAsync</c> / <c>SaveChangesAsync</c>
    /// call (unlike inventory items) because there is no per-item uniqueness constraint that
    /// could cause a partial failure — tier names are not globally unique.
    /// </remarks>
    /// <param name="company">The tenant company to seed pricing tiers for.</param>
    /// <returns>The number of tiers created (4), or 0 if tiers already existed.</returns>
    private async Task<int> SeedPricingTiersAsync(Company company)
    {
        // Check if pricing tiers already exist
        var existingTiers = await _context.Set<PricingTier>()
            .IgnoreQueryFilters()
            .AnyAsync(pt => pt.CompanyId == company.Id && !pt.IsDeleted);

        if (existingTiers)
        {
            return 0;
        }

        var pricingTiers = new List<PricingTier>
        {
            new PricingTier
            {
                TierName = "Standard",
                Description = "Standard pricing for regular customers",
                DiscountPercent = 0m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new PricingTier
            {
                TierName = "Silver",
                Description = "5% discount for valued customers",
                DiscountPercent = 5.00m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new PricingTier
            {
                TierName = "Gold",
                Description = "10% discount for high-volume customers",
                DiscountPercent = 10.00m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new PricingTier
            {
                TierName = "Platinum",
                Description = "15% discount for premium customers",
                DiscountPercent = 15.00m,
                IsActive = true,
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            }
        };

        await _context.Set<PricingTier>().AddRangeAsync(pricingTiers);
        await _context.SaveChangesAsync();

        return pricingTiers.Count;
    }

    /// <summary>
    /// Seeds five real-world powder-coating suppliers as demo vendor records for the company
    /// (Prismatic Powders, Columbia Coatings, Sherwin-Williams Industrial, Ace Hardware, Fastenal).
    /// </summary>
    /// <remarks>
    /// Uses an all-or-nothing <c>AddRangeAsync</c> approach (vs. per-item saves) because
    /// vendors have no globally-unique constraint — uniqueness is only enforced per company.
    /// The seeder bails early if any vendors already exist for the company, so re-running
    /// will not double-up entries.
    /// These vendor records are referenced by <see cref="SeedBillsAsync"/> and
    /// <see cref="SeedExpensesAsync"/> by name match (e.g., "Prismatic", "Columbia"), so the
    /// names must not be changed without also updating the bills seeder's lookup logic.
    /// </remarks>
    /// <param name="company">The tenant company to seed vendors for.</param>
    /// <returns>The number of vendors created (5), or 0 if vendors already existed.</returns>
    private async Task<int> SeedVendorsAsync(Company company)
    {
        var exists = await _context.Set<Vendor>()
            .IgnoreQueryFilters()
            .AnyAsync(v => v.CompanyId == company.Id && !v.IsDeleted);
        if (exists) return 0;

        var vendors = new List<Vendor>
        {
            new Vendor { CompanyId = company.Id, CompanyName = "Prismatic Powders", ContactName = "Sales", Email = "sales@prismaticpowders.com", Phone = "800-867-4445", Website = "https://www.prismaticpowders.com", IsActive = true, Country = "USA", CreatedAt = DateTime.UtcNow },
            new Vendor { CompanyId = company.Id, CompanyName = "Columbia Coatings", ContactName = "Sales", Email = "info@columbiacoatings.com", Phone = "888-265-8247", Website = "https://www.columbiacoatings.com", IsActive = true, Country = "USA", CreatedAt = DateTime.UtcNow },
            new Vendor { CompanyId = company.Id, CompanyName = "Sherwin-Williams Industrial", ContactName = "Account Rep", Email = "industrial@sherwin-williams.com", Phone = "800-524-5979", Website = "https://www.sherwin-williams.com", IsActive = true, Country = "USA", CreatedAt = DateTime.UtcNow },
            new Vendor { CompanyId = company.Id, CompanyName = "Ace Hardware Supply", ContactName = "Purchasing", Email = "supply@acehardware.com", Phone = "630-990-6600", Website = "https://www.acehardware.com", IsActive = true, Country = "USA", CreatedAt = DateTime.UtcNow },
            new Vendor { CompanyId = company.Id, CompanyName = "Fastenal Industrial", ContactName = "Sales Team", Email = "sales@fastenal.com", Phone = "507-454-5374", Website = "https://www.fastenal.com", IsActive = true, Country = "USA", CreatedAt = DateTime.UtcNow },
        };

        await _context.Set<Vendor>().AddRangeAsync(vendors);
        await _context.SaveChangesAsync();
        return vendors.Count;
    }

    /// <summary>
    /// Seeds two named oven configurations ("Main Oven" and "Small Oven") with hourly cost,
    /// capacity (sq ft), and default cycle time (minutes) for the Oven Scheduler feature.
    /// </summary>
    /// <remarks>
    /// Named ovens are stored in the <c>OvenCost</c> entity (not <c>Equipment</c>) because
    /// the Oven Scheduler batches jobs by oven cost record, not by equipment record — this
    /// allows multiple logical "ovens" to share the same physical equipment with different
    /// cost/capacity profiles.
    ///
    /// After inserting the ovens, the method checks the company's
    /// <see cref="CompanyOperatingCosts.OvenOperatingCostPerHour"/> field: if it is still 0
    /// (meaning <see cref="SeedOperatingCostsAsync"/> did not run or set a non-zero value),
    /// it is synced to the Main Oven's rate.  This prevents the pricing engine from
    /// calculating $0 oven cost on newly seeded companies.
    ///
    /// The <c>MaxLoadSqFt</c> and <c>DefaultCycleMinutes</c> fields are used by the
    /// Oven Scheduler's capacity-planning and suggested-batch logic.
    /// </remarks>
    /// <param name="company">The tenant company to seed oven configurations for.</param>
    /// <returns>The number of oven records created (2), or 0 if any already existed.</returns>
    private async Task<int> SeedOvenCostsAsync(Company company)
    {
        var exists = await _context.Set<OvenCost>()
            .IgnoreQueryFilters()
            .AnyAsync(o => o.CompanyId == company.Id && !o.IsDeleted);
        if (exists) return 0;

        var ovens = new List<OvenCost>
        {
            new OvenCost { CompanyId = company.Id, Label = "Main Oven",   CostPerHour = 15.00m, MaxLoadSqFt = 120m, DefaultCycleMinutes = 50, IsActive = true, DisplayOrder = 1, CreatedAt = DateTime.UtcNow },
            new OvenCost { CompanyId = company.Id, Label = "Small Oven",  CostPerHour = 8.00m,  MaxLoadSqFt = 40m,  DefaultCycleMinutes = 45, IsActive = true, DisplayOrder = 2, CreatedAt = DateTime.UtcNow },
        };

        await _context.Set<OvenCost>().AddRangeAsync(ovens);
        await _context.SaveChangesAsync();

        // Set operating cost to first oven's rate if not already set
        var costs = await _context.Set<CompanyOperatingCosts>()
            .FirstOrDefaultAsync(c => c.CompanyId == company.Id);
        if (costs != null && costs.OvenOperatingCostPerHour == 0)
        {
            costs.OvenOperatingCostPerHour = ovens[0].CostPerHour;
            await _context.SaveChangesAsync();
        }

        return ovens.Count;
    }
}