using Microsoft.EntityFrameworkCore;
using PowderCoating.Core.Entities;
using PowderCoating.Core.Enums;

namespace PowderCoating.Infrastructure.Services;

public partial class SeedDataService
{
    /// <summary>
    /// Seeds a default chart of accounts for a newly onboarded company, covering all five
    /// standard double-entry categories: Assets, Liabilities, Equity, Revenue (with separate
    /// powder coating and sandblasting lines), Cost of Goods Sold, and Expenses.
    /// </summary>
    /// <remarks>
    /// <para>
    /// Idempotency: returns 0 immediately if any non-deleted accounts already exist for this
    /// company, so re-running seed does not produce duplicate account numbers.
    /// </para>
    /// <para>
    /// Several accounts are marked <c>IsSystem = true</c> (Checking, AR, AP, and main Powder
    /// Coating Revenue). System accounts are referenced by account number in other seeders
    /// (e.g. <c>SeedInvoicesAsync</c> looks up account "4000" for invoice line items) and
    /// should not be renamed or deleted by end users.
    /// </para>
    /// <para>
    /// Account numbers follow a conventional small-business numbering scheme:
    /// 1xxx = Assets, 2xxx = Liabilities, 3xxx = Equity, 4xxx = Revenue,
    /// 5xxx = Cost of Goods Sold, 6xxx = Expenses. This makes the chart immediately
    /// recognisable to accountants without custom configuration.
    /// </para>
    /// </remarks>
    /// <param name="company">The tenant company to seed the chart of accounts for.</param>
    /// <returns>Number of account records inserted, or 0 if already seeded.</returns>
    private async Task<int> SeedDefaultChartOfAccountsAsync(Company company)
    {
        var existingCount = await _context.Set<Account>()
            .IgnoreQueryFilters()
            .CountAsync(a => a.CompanyId == company.Id && !a.IsDeleted);

        if (existingCount > 0)
            return 0; // Already seeded

        var now = DateTime.UtcNow;
        var accounts = new List<Account>
        {
            // ── ASSETS ────────────────────────────────────────────────────────
            new Account { AccountNumber = "1000", Name = "Checking Account",          AccountType = AccountType.Asset,      AccountSubType = AccountSubType.Checking,            IsSystem = true,  IsActive = true, Description = "Primary business checking account",          CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "1010", Name = "Savings Account",           AccountType = AccountType.Asset,      AccountSubType = AccountSubType.Savings,             IsSystem = false, IsActive = true, Description = "Business savings account",                   CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "1100", Name = "Accounts Receivable",       AccountType = AccountType.Asset,      AccountSubType = AccountSubType.AccountsReceivable,  IsSystem = true,  IsActive = true, Description = "Amounts owed by customers for services",     CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "1200", Name = "Inventory - Powder",        AccountType = AccountType.Asset,      AccountSubType = AccountSubType.Inventory,           IsSystem = false, IsActive = true, Description = "Powder coating materials in stock",          CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "1210", Name = "Inventory - Consumables",   AccountType = AccountType.Asset,      AccountSubType = AccountSubType.Inventory,           IsSystem = false, IsActive = true, Description = "Masking, tape, and other consumables",       CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "1300", Name = "Equipment",                 AccountType = AccountType.Asset,      AccountSubType = AccountSubType.FixedAsset,          IsSystem = false, IsActive = true, Description = "Ovens, booths, sandblasters, and equipment", CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "1310", Name = "Accumulated Depreciation",  AccountType = AccountType.Asset,      AccountSubType = AccountSubType.FixedAsset,          IsSystem = false, IsActive = true, Description = "Accumulated depreciation on equipment",      CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "1400", Name = "Prepaid Expenses",          AccountType = AccountType.Asset,      AccountSubType = AccountSubType.OtherCurrentAsset,   IsSystem = false, IsActive = true, Description = "Prepaid insurance, rent, and other items",   CompanyId = company.Id, CreatedAt = now },

            // ── LIABILITIES ───────────────────────────────────────────────────
            new Account { AccountNumber = "2000", Name = "Accounts Payable",          AccountType = AccountType.Liability,  AccountSubType = AccountSubType.AccountsPayable,     IsSystem = true,  IsActive = true, Description = "Amounts owed to suppliers and vendors",      CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "2100", Name = "Credit Card Payable",       AccountType = AccountType.Liability,  AccountSubType = AccountSubType.CreditCard,          IsSystem = false, IsActive = true, Description = "Business credit card balance",               CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "2200", Name = "Sales Tax Payable",         AccountType = AccountType.Liability,  AccountSubType = AccountSubType.OtherCurrentLiability, IsSystem = false, IsActive = true, Description = "Sales tax collected and owed to government", CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "2300", Name = "Payroll Liabilities",       AccountType = AccountType.Liability,  AccountSubType = AccountSubType.OtherCurrentLiability, IsSystem = false, IsActive = true, Description = "Payroll taxes and withholdings owed",       CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "2900", Name = "Business Loan",             AccountType = AccountType.Liability,  AccountSubType = AccountSubType.LongTermLiability,   IsSystem = false, IsActive = true, Description = "Long-term equipment or business loan",       CompanyId = company.Id, CreatedAt = now },

            // ── EQUITY ────────────────────────────────────────────────────────
            new Account { AccountNumber = "3000", Name = "Owner's Equity",            AccountType = AccountType.Equity,     AccountSubType = AccountSubType.OwnersEquity,        IsSystem = false, IsActive = true, Description = "Owner's invested capital",                   CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "3100", Name = "Retained Earnings",         AccountType = AccountType.Equity,     AccountSubType = AccountSubType.RetainedEarnings,    IsSystem = false, IsActive = true, Description = "Cumulative net income retained in business", CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "3200", Name = "Owner's Draw",              AccountType = AccountType.Equity,     AccountSubType = AccountSubType.OwnersEquity,        IsSystem = false, IsActive = true, Description = "Withdrawals by owner",                       CompanyId = company.Id, CreatedAt = now },

            // ── REVENUE ───────────────────────────────────────────────────────
            new Account { AccountNumber = "4000", Name = "Powder Coating Revenue",    AccountType = AccountType.Revenue,    AccountSubType = AccountSubType.Sales,               IsSystem = true,  IsActive = true, Description = "Revenue from powder coating services",       CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "4100", Name = "Sandblasting Revenue",      AccountType = AccountType.Revenue,    AccountSubType = AccountSubType.ServiceRevenue,      IsSystem = false, IsActive = true, Description = "Revenue from sandblasting services",         CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "4200", Name = "Other Service Revenue",     AccountType = AccountType.Revenue,    AccountSubType = AccountSubType.ServiceRevenue,      IsSystem = false, IsActive = true, Description = "Revenue from other shop services",           CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "4900", Name = "Other Income",              AccountType = AccountType.Revenue,    AccountSubType = AccountSubType.OtherIncome,         IsSystem = false, IsActive = true, Description = "Miscellaneous income",                       CompanyId = company.Id, CreatedAt = now },

            // ── COST OF GOODS SOLD ────────────────────────────────────────────
            new Account { AccountNumber = "5000", Name = "Cost of Goods Sold",        AccountType = AccountType.CostOfGoods, AccountSubType = AccountSubType.CostOfGoodsSold,   IsSystem = false, IsActive = true, Description = "Direct cost of services delivered",          CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "5100", Name = "Powder & Materials",        AccountType = AccountType.CostOfGoods, AccountSubType = AccountSubType.CostOfGoodsSold,   IsSystem = false, IsActive = true, Description = "Powder coatings and direct materials used",  CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "5200", Name = "Consumables & Shop Supplies", AccountType = AccountType.CostOfGoods, AccountSubType = AccountSubType.CostOfGoodsSold, IsSystem = false, IsActive = true, Description = "Masking, tape, and other job supplies",      CompanyId = company.Id, CreatedAt = now },

            // ── EXPENSES ──────────────────────────────────────────────────────
            new Account { AccountNumber = "6000", Name = "Advertising & Marketing",   AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Advertising,         IsSystem = false, IsActive = true, Description = "Advertising, marketing, and promotions",     CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6100", Name = "Equipment & Repairs",       AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Equipment,           IsSystem = false, IsActive = true, Description = "Equipment maintenance and repair costs",      CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6200", Name = "Insurance",                 AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Insurance,           IsSystem = false, IsActive = true, Description = "Business, liability, and equipment insurance", CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6300", Name = "Payroll & Labor",           AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Payroll,             IsSystem = false, IsActive = true, Description = "Wages, salaries, and payroll taxes",         CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6400", Name = "Professional Fees",         AccountType = AccountType.Expense,    AccountSubType = AccountSubType.ProfessionalFees,    IsSystem = false, IsActive = true, Description = "Accounting, legal, and consulting fees",     CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6500", Name = "Rent & Facilities",         AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Rent,                IsSystem = false, IsActive = true, Description = "Shop rent and facility costs",               CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6600", Name = "Utilities",                 AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Utilities,           IsSystem = false, IsActive = true, Description = "Electric, gas, water, and internet",         CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6700", Name = "Vehicle & Transportation",  AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Vehicle,             IsSystem = false, IsActive = true, Description = "Fuel, vehicle maintenance, and transport",   CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6800", Name = "Office Supplies",           AccountType = AccountType.Expense,    AccountSubType = AccountSubType.OfficeSupplies,      IsSystem = false, IsActive = true, Description = "General office and administrative supplies",  CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6900", Name = "Bank Charges & Fees",       AccountType = AccountType.Expense,    AccountSubType = AccountSubType.BankCharges,         IsSystem = false, IsActive = true, Description = "Bank fees, merchant processing, and wire fees", CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6950", Name = "Depreciation Expense",      AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Depreciation,        IsSystem = false, IsActive = true, Description = "Depreciation on fixed assets",               CompanyId = company.Id, CreatedAt = now },
            new Account { AccountNumber = "6990", Name = "Other Expenses",            AccountType = AccountType.Expense,    AccountSubType = AccountSubType.Other,               IsSystem = false, IsActive = true, Description = "Miscellaneous business expenses",            CompanyId = company.Id, CreatedAt = now },
        };

        await _context.Set<Account>().AddRangeAsync(accounts);
        await _context.SaveChangesAsync();

        return accounts.Count;
    }
}