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

namespace PowderCoating.Infrastructure.Services;

public partial class SeedDataService
{
    /// <summary>
    /// Seeds seven standard appointment status lookup rows for a company:
    /// Scheduled, Confirmed, In Progress, Completed, Cancelled, No Show, and Rescheduled.
    /// </summary>
    /// <remarks>
    /// Appointment statuses follow the same lookup-table pattern as job statuses: the
    /// <c>StatusCode</c> strings are referenced by application code; the display name, colour,
    /// and icon are cosmetic and operator-customisable.
    ///
    /// Terminal statuses (Completed, Cancelled, No Show) set <c>IsTerminalStatus = true</c>
    /// so the calendar and scheduler can filter them out of the "active" appointment view
    /// without hard-coding status codes.
    ///
    /// System-defined statuses (Scheduled, Completed, Cancelled) are marked
    /// <c>IsSystemDefined = true</c> to prevent operators from deleting them, as the
    /// appointment-creation workflow always defaults to "SCHEDULED" on new records.
    ///
    /// Idempotency: bails early if 7 or more rows already exist for the company.
    /// </remarks>
    /// <param name="company">The tenant company to seed appointment statuses for.</param>
    /// <returns>The number of status rows created (7), or 0 if already seeded.</returns>
    private async Task<int> SeedAppointmentStatusLookupsAsync(Company company)
    {
        // Check if appointment statuses already exist for this company
        var existingCount = await _context.Set<AppointmentStatusLookup>()
            .IgnoreQueryFilters()
            .CountAsync(s => s.CompanyId == company.Id && !s.IsDeleted);

        if (existingCount >= 7)
        {
            return 0; // Already seeded
        }

        var statuses = new List<AppointmentStatusLookup>
        {
            new AppointmentStatusLookup
            {
                StatusCode = "SCHEDULED",
                DisplayName = "Scheduled",
                DisplayOrder = 1,
                ColorClass = "primary",
                IconClass = "bi-calendar-check",
                IsActive = true,
                IsSystemDefined = true,
                IsTerminalStatus = false,
                Description = "Appointment has been scheduled",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentStatusLookup
            {
                StatusCode = "CONFIRMED",
                DisplayName = "Confirmed",
                DisplayOrder = 2,
                ColorClass = "success",
                IconClass = "bi-check-circle",
                IsActive = true,
                IsSystemDefined = false,
                IsTerminalStatus = false,
                Description = "Customer has confirmed the appointment",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentStatusLookup
            {
                StatusCode = "IN_PROGRESS",
                DisplayName = "In Progress",
                DisplayOrder = 3,
                ColorClass = "warning",
                IconClass = "bi-hourglass-split",
                IsActive = true,
                IsSystemDefined = false,
                IsTerminalStatus = false,
                Description = "Appointment is currently in progress",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentStatusLookup
            {
                StatusCode = "COMPLETED",
                DisplayName = "Completed",
                DisplayOrder = 4,
                ColorClass = "success",
                IconClass = "bi-check2-all",
                IsActive = true,
                IsSystemDefined = true,
                IsTerminalStatus = true,
                Description = "Appointment was completed successfully",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentStatusLookup
            {
                StatusCode = "CANCELLED",
                DisplayName = "Cancelled",
                DisplayOrder = 5,
                ColorClass = "danger",
                IconClass = "bi-x-circle",
                IsActive = true,
                IsSystemDefined = true,
                IsTerminalStatus = true,
                Description = "Appointment was cancelled",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentStatusLookup
            {
                StatusCode = "NO_SHOW",
                DisplayName = "No Show",
                DisplayOrder = 6,
                ColorClass = "secondary",
                IconClass = "bi-person-x",
                IsActive = true,
                IsSystemDefined = false,
                IsTerminalStatus = true,
                Description = "Customer did not show up for appointment",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentStatusLookup
            {
                StatusCode = "RESCHEDULED",
                DisplayName = "Rescheduled",
                DisplayOrder = 7,
                ColorClass = "info",
                IconClass = "bi-arrow-repeat",
                IsActive = true,
                IsSystemDefined = false,
                IsTerminalStatus = false,
                Description = "Appointment has been rescheduled to a different time",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            }
        };

        await _context.Set<AppointmentStatusLookup>().AddRangeAsync(statuses);
        await _context.SaveChangesAsync();

        return statuses.Count;
    }

    /// <summary>
    /// Seeds four standard appointment type lookup rows for a company:
    /// Customer Drop-Off, Customer Pick-Up, Consultation/Quote, and Scheduled Job Work.
    /// </summary>
    /// <remarks>
    /// Appointment types categorise the purpose of a calendar entry and control optional UI
    /// behaviour via <c>RequiresJobLink</c>: the JOB_WORK type sets this to <c>true</c>,
    /// prompting the calendar UI to show a mandatory job selector when scheduling that type.
    /// All other types leave it <c>false</c> because drop-offs, pick-ups, and consultations
    /// may exist before a job has been created.
    ///
    /// The <c>TypeCode</c> strings are referenced by <see cref="SeedAppointmentsAsync"/>
    /// when building appointment titles and determining job-link probability, so they must
    /// not be changed after initial seeding.
    ///
    /// Colour classes (purple, green, blue, orange) map to custom CSS variables in the
    /// calendar stylesheet — they are distinct from Bootstrap's standard colour palette to
    /// give each appointment type a unique calendar stripe colour.
    ///
    /// Idempotency: bails early if 4 or more rows already exist for the company.
    /// </remarks>
    /// <param name="company">The tenant company to seed appointment types for.</param>
    /// <returns>The number of type rows created (4), or 0 if already seeded.</returns>
    private async Task<int> SeedAppointmentTypeLookupsAsync(Company company)
    {
        // Check if appointment types already exist for this company
        var existingCount = await _context.Set<AppointmentTypeLookup>()
            .IgnoreQueryFilters()
            .CountAsync(t => t.CompanyId == company.Id && !t.IsDeleted);

        if (existingCount >= 4)
        {
            return 0; // Already seeded
        }

        var types = new List<AppointmentTypeLookup>
        {
            new AppointmentTypeLookup
            {
                TypeCode = "DROP_OFF",
                DisplayName = "Customer Drop-Off",
                DisplayOrder = 1,
                ColorClass = "purple",
                IconClass = "bi-box-arrow-in-down",
                RequiresJobLink = false,
                IsActive = true,
                IsSystemDefined = true,
                Description = "Customer dropping off items for coating",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentTypeLookup
            {
                TypeCode = "PICK_UP",
                DisplayName = "Customer Pick-Up",
                DisplayOrder = 2,
                ColorClass = "green",
                IconClass = "bi-box-arrow-up",
                RequiresJobLink = false,
                IsActive = true,
                IsSystemDefined = true,
                Description = "Customer picking up completed items",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentTypeLookup
            {
                TypeCode = "CONSULTATION",
                DisplayName = "Consultation/Quote",
                DisplayOrder = 3,
                ColorClass = "blue",
                IconClass = "bi-chat-dots",
                RequiresJobLink = false,
                IsActive = true,
                IsSystemDefined = true,
                Description = "Consultation meeting or quote discussion",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            },
            new AppointmentTypeLookup
            {
                TypeCode = "JOB_WORK",
                DisplayName = "Scheduled Job Work",
                DisplayOrder = 4,
                ColorClass = "orange",
                IconClass = "bi-tools",
                RequiresJobLink = true,
                IsActive = true,
                IsSystemDefined = true,
                Description = "Scheduled work time for a specific job",
                CompanyId = company.Id,
                CreatedAt = DateTime.UtcNow
            }
        };

        await _context.Set<AppointmentTypeLookup>().AddRangeAsync(types);
        await _context.SaveChangesAsync();

        return types.Count;
    }

    /// <summary>
    /// Seeds up to 50 sample appointments for a company, distributed across weekdays over
    /// the next ~60 days, with randomised types, customers, durations, statuses, and optional
    /// job links and worker assignments.
    /// </summary>
    /// <remarks>
    /// <b>Purpose:</b> Provides a realistic-looking calendar on first login so that the
    /// Appointments / Calendar feature is immediately useful to evaluate in a demo environment.
    ///
    /// <b>Randomisation:</b> A seeded <see cref="Random"/> with seed 42 is used so that the
    /// generated appointments are deterministic — re-seeding the same company always produces
    /// the same schedule, which simplifies support and testing reproducibility.
    ///
    /// <b>Weekend exclusion:</b> Saturday and Sunday are skipped to match typical shop hours.
    /// The loop iterates calendar days (up to a 90-day safety cap) rather than counting
    /// business days directly because the simpler approach avoids edge cases around month
    /// boundaries and holidays.
    ///
    /// <b>Job links:</b> JOB_WORK type appointments have a 40% chance of linking to an
    /// existing job; other types have a 20% chance.  Jobs and customers must already be seeded
    /// (via <see cref="SeedJobsAsync"/> and <see cref="SeedCustomersAsync"/>) for links to
    /// be available — if either collection is empty, the method still seeds appointments but
    /// without links.
    ///
    /// <b>Worker assignments:</b> 50% of appointments are assigned to a random active company
    /// user.  Workers are loaded without <c>IgnoreQueryFilters</c> because the global
    /// filter for users is identity-based, not company-scoped, and the check
    /// <c>u.CompanyId == company.Id</c> is applied in the LINQ predicate instead.
    ///
    /// <b>Prerequisites:</b> Requires appointment types and statuses to already be seeded;
    /// returns 0 without creating any records if either collection is empty.
    ///
    /// Idempotency: returns 0 if 10 or more appointments already exist for the company.
    /// The threshold is 10 (not 50) so that a previously partial seed is detected and skipped
    /// rather than doubled up.
    /// </remarks>
    /// <param name="company">The tenant company to seed appointments for.</param>
    /// <returns>The number of appointment records created (up to 50), or 0 if skipped.</returns>
    private async Task<int> SeedAppointmentsAsync(Company company)
    {
        // Check if appointments already exist for this company
        var existingCount = await _context.Set<Appointment>()
            .IgnoreQueryFilters()
            .CountAsync(a => a.CompanyId == company.Id && !a.IsDeleted);

        if (existingCount >= 10)
        {
            return 0; // Already seeded (at least some appointments exist)
        }

        // Get required lookup data
        var appointmentTypes = await _context.Set<AppointmentTypeLookup>()
            .IgnoreQueryFilters()
            .Where(t => t.CompanyId == company.Id)
            .OrderBy(t => t.DisplayOrder)
            .ToListAsync();

        var appointmentStatuses = await _context.Set<AppointmentStatusLookup>()
            .IgnoreQueryFilters()
            .Where(s => s.CompanyId == company.Id)
            .OrderBy(s => s.DisplayOrder)
            .ToListAsync();

        var customers = await _context.Set<Customer>()
            .IgnoreQueryFilters()
            .Where(c => c.CompanyId == company.Id)
            .OrderBy(c => c.Id)
            .ToListAsync();

        var jobs = await _context.Set<Job>()
            .IgnoreQueryFilters()
            .Where(j => j.CompanyId == company.Id)
            .OrderBy(j => j.Id)
            .ToListAsync();

        var workers = await _context.Set<ApplicationUser>()
            .Where(u => u.CompanyId == company.Id && u.IsActive)
            .OrderBy(u => u.Id)
            .ToListAsync();

        if (!appointmentTypes.Any() || !appointmentStatuses.Any() || !customers.Any())
        {
            return 0; // Can't seed appointments without required data
        }

        var random = new Random(42); // Deterministic for consistency
        var appointments = new List<Appointment>();
        var startDate = DateTime.Today;
        var appointmentTitles = new Dictionary<string, string[]>
        {
            ["DROP_OFF"] = new[] { "Customer Drop-Off", "Parts Delivery", "Item Drop-Off", "Material Drop-Off" },
            ["PICK_UP"] = new[] { "Customer Pick-Up", "Collection Appointment", "Order Pick-Up", "Completed Items Pick-Up" },
            ["CONSULTATION"] = new[] { "Quote Discussion", "Project Consultation", "Initial Consultation", "Color Selection Meeting" },
            ["JOB_WORK"] = new[] { "Sandblasting Session", "Coating Work", "Quality Inspection", "Final Finishing" }
        };

        // Get status IDs by code for easy assignment
        var scheduledStatusId = appointmentStatuses.First(s => s.StatusCode == "SCHEDULED").Id;
        var confirmedStatusId = appointmentStatuses.First(s => s.StatusCode == "CONFIRMED").Id;

        // Generate 50 appointments across next 60 days (weekdays only)
        int appointmentsCreated = 0;
        int daysChecked = 0;
        var currentDate = startDate;

        while (appointmentsCreated < 50 && daysChecked < 90) // Safety limit
        {
            currentDate = startDate.AddDays(daysChecked);
            daysChecked++;

            // Skip weekends
            if (currentDate.DayOfWeek == DayOfWeek.Saturday || currentDate.DayOfWeek == DayOfWeek.Sunday)
            {
                continue;
            }

            // Create 1-3 appointments per weekday (varied distribution)
            int appointmentsToday = random.Next(1, 4);

            for (int i = 0; i < appointmentsToday && appointmentsCreated < 50; i++)
            {
                // Random type
                var appointmentType = appointmentTypes[random.Next(appointmentTypes.Count)];

                // Random customer
                var customer = customers[random.Next(customers.Count)];

                // Random time during business hours (8 AM - 4 PM for start times)
                int startHour = random.Next(8, 17);
                int startMinute = random.Next(0, 4) * 15; // 0, 15, 30, 45
                var scheduledStart = new DateTime(currentDate.Year, currentDate.Month, currentDate.Day,
                    startHour, startMinute, 0, DateTimeKind.Utc);

                // Duration: 30 min to 2 hours
                int durationMinutes = random.Next(1, 5) * 30; // 30, 60, 90, or 120 minutes
                var scheduledEnd = scheduledStart.AddMinutes(durationMinutes);

                // Status: 80% SCHEDULED, 20% CONFIRMED (for future appointments)
                int statusId = random.Next(100) < 80 ? scheduledStatusId : confirmedStatusId;

                // Title
                string title = $"{customer.CompanyName} - {appointmentTitles[appointmentType.TypeCode][random.Next(appointmentTitles[appointmentType.TypeCode].Length)]}";

                // Optional job link (40% chance if type is JOB_WORK, 20% for others)
                int? jobId = null;
                if (jobs.Any())
                {
                    int jobLinkChance = appointmentType.TypeCode == "JOB_WORK" ? 40 : 20;
                    if (random.Next(100) < jobLinkChance)
                    {
                        jobId = jobs[random.Next(jobs.Count)].Id;
                    }
                }

                // Optional user assignment (50% chance)
                string? assignedWorkerId = null;
                if (workers.Any() && random.Next(100) < 50)
                {
                    assignedWorkerId = workers[random.Next(workers.Count)].Id;
                }

                // Location (60% chance)
                string? location = null;
                if (random.Next(100) < 60)
                {
                    var locations = new[] { "Main Office", "Loading Dock", "Shop Floor", "Coating Area", "Reception" };
                    location = locations[random.Next(locations.Length)];
                }

                var appointment = new Appointment
                {
                    AppointmentNumber = $"APT-{currentDate:yyMM}-{(appointmentsCreated + 1):D4}",
                    CustomerId = customer.Id,
                    JobId = jobId,
                    AppointmentStatusId = statusId,
                    AppointmentTypeId = appointmentType.Id,
                    AssignedUserId = assignedWorkerId,
                    Title = title,
                    Description = random.Next(100) < 40 ? $"Scheduled appointment for {appointmentType.DisplayName.ToLower()}" : null,
                    ScheduledStartTime = scheduledStart,
                    ScheduledEndTime = scheduledEnd,
                    IsAllDay = false,
                    Location = location,
                    IsReminderEnabled = random.Next(100) < 70, // 70% have reminders
                    ReminderMinutesBefore = 30,
                    Notes = random.Next(100) < 30 ? "Auto-generated demo appointment" : null,
                    CompanyId = company.Id,
                    CreatedAt = DateTime.UtcNow
                };

                appointments.Add(appointment);
                appointmentsCreated++;
            }
        }

        await _context.Set<Appointment>().AddRangeAsync(appointments);
        await _context.SaveChangesAsync();

        return appointments.Count;
    }
}