using foodmarket.Domain.Catalog;
using foodmarket.Domain.Organizations;
using foodmarket.Infrastructure.Identity;
using foodmarket.Infrastructure.Persistence;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;

namespace foodmarket.Api.Seed;

public class DevDataSeeder : IHostedService
{
    private readonly IServiceProvider _services;
    private readonly IHostEnvironment _env;

    public DevDataSeeder(IServiceProvider services, IHostEnvironment env)
    {
        _services = services;
        _env = env;
    }

    public async Task StartAsync(CancellationToken ct)
    {
        // Idempotent — runs in all envs to bootstrap a usable admin + demo org.
        // Once first real user/org is set up via UI, rename/disable demo.
        // (Wired regardless of env so stage/prod first-deploy lands a working
        //  admin, otherwise nobody can log in.)

        using var scope = _services.CreateScope();
        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
        var userMgr = scope.ServiceProvider.GetRequiredService<UserManager<User>>();
        var roleMgr = scope.ServiceProvider.GetRequiredService<RoleManager<Role>>();

        foreach (var role in new[] { SystemRoles.SuperAdmin, SystemRoles.Admin, SystemRoles.Manager, SystemRoles.Cashier, SystemRoles.Storekeeper })
        {
            if (!await roleMgr.RoleExistsAsync(role))
            {
                await roleMgr.CreateAsync(new Role { Name = role });
            }
        }

        var kzt = await db.Currencies.FirstOrDefaultAsync(c => c.Code == "KZT", ct);
        var demoOrg = await db.Organizations.FirstOrDefaultAsync(o => o.Name == "Demo Market", ct);
        if (demoOrg is null)
        {
            demoOrg = new Organization
            {
                Name = "Demo Market",
                CountryCode = "KZ",
                Bin = "000000000000",
                Address = "Алматы, ул. Пример 1",
                Phone = "+7 (777) 000-00-00",
                Email = "demo@food-market.local",
                DefaultCurrencyId = kzt?.Id,
            };
            db.Organizations.Add(demoOrg);
            await db.SaveChangesAsync(ct);
        }
        else if (demoOrg.DefaultCurrencyId is null && kzt is not null)
        {
            demoOrg.DefaultCurrencyId = kzt.Id;
            await db.SaveChangesAsync(ct);
        }

        await SeedTenantReferencesAsync(db, demoOrg.Id, ct);

        const string adminEmail = "admin@food-market.local";
        var admin = await userMgr.FindByEmailAsync(adminEmail);
        if (admin is null)
        {
            admin = new User
            {
                UserName = adminEmail,
                Email = adminEmail,
                EmailConfirmed = true,
                FullName = "System Admin",
                OrganizationId = demoOrg.Id,
            };
            var result = await userMgr.CreateAsync(admin, "Admin12345!");
            if (result.Succeeded)
            {
                await userMgr.AddToRoleAsync(admin, SystemRoles.Admin);
            }
        }

        await SeedAdminEmployeeAsync(db, demoOrg.Id, admin?.Id, ct);
    }

    /// <summary>Привязывает существующего admin@food-market.local к
    /// Employee-записи с системной ролью «Администратор» — чтобы UI «Сотрудники»
    /// сразу показывал учётку с правильной ролью, а не пустой список.</summary>
    private static async Task SeedAdminEmployeeAsync(AppDbContext db, Guid orgId, Guid? adminUserId, CancellationToken ct)
    {
        if (adminUserId is null) return;
        var existing = await db.Employees.IgnoreQueryFilters()
            .FirstOrDefaultAsync(e => e.OrganizationId == orgId && e.UserId == adminUserId, ct);
        if (existing is not null) return;
        var adminRole = await db.EmployeeRoles.IgnoreQueryFilters()
            .FirstOrDefaultAsync(r => r.OrganizationId == orgId && r.IsSystem && r.Name == "Администратор", ct);
        if (adminRole is null) return;
        db.Employees.Add(new Employee
        {
            OrganizationId = orgId,
            UserId = adminUserId,
            LastName = "Admin",
            FirstName = "System",
            Position = "Администратор",
            Email = "admin@food-market.local",
            RoleId = adminRole.Id,
            IsActive = true,
        });
        await db.SaveChangesAsync(ct);
    }

    private static async Task SeedTenantReferencesAsync(AppDbContext db, Guid orgId, CancellationToken ct)
    {
        var anyUnit = await db.UnitsOfMeasure.IgnoreQueryFilters().AnyAsync(u => u.OrganizationId == orgId, ct);
        if (!anyUnit)
        {
            db.UnitsOfMeasure.AddRange(
                new UnitOfMeasure { OrganizationId = orgId, Code = "796", Name = "штука" },
                new UnitOfMeasure { OrganizationId = orgId, Code = "166", Name = "килограмм" },
                new UnitOfMeasure { OrganizationId = orgId, Code = "112", Name = "литр" },
                new UnitOfMeasure { OrganizationId = orgId, Code = "006", Name = "метр" },
                new UnitOfMeasure { OrganizationId = orgId, Code = "625", Name = "упаковка" }
            );
        }

        // Сидируем PriceType ТОЛЬКО если у организации не было ни одной записи.
        // Если есть — никогда не создаём «системную копию», корректность IsSystem
        // обеспечивает миграция Phase3b_FixPriceTypeIsSystem (выбор по факту:
        // запись с максимумом ProductPrice).
        var anyPriceType = await db.PriceTypes.IgnoreQueryFilters().AnyAsync(p => p.OrganizationId == orgId, ct);
        if (!anyPriceType)
        {
            db.PriceTypes.AddRange(
                new PriceType { OrganizationId = orgId, Name = "Розничная цена", IsSystem = true, IsRequired = true, IsRetail = true, SortOrder = 0 },
                new PriceType { OrganizationId = orgId, Name = "Оптовая", SortOrder = 1 }
            );
        }

        var mainStore = await db.Stores.IgnoreQueryFilters().FirstOrDefaultAsync(s => s.OrganizationId == orgId && s.IsMain, ct);
        if (mainStore is null)
        {
            mainStore = new Store
            {
                OrganizationId = orgId,
                Name = "Основной склад",
                Code = "MAIN",
                IsMain = true,
                Address = "Алматы, ул. Пример 1",
            };
            db.Stores.Add(mainStore);
            await db.SaveChangesAsync(ct);
        }

        var anyRetail = await db.RetailPoints.IgnoreQueryFilters().AnyAsync(r => r.OrganizationId == orgId, ct);
        if (!anyRetail)
        {
            db.RetailPoints.Add(new RetailPoint
            {
                OrganizationId = orgId,
                Name = "Касса 1",
                Code = "POS-1",
                StoreId = mainStore.Id,
            });
        }

        await db.SaveChangesAsync(ct);

        await SeedEmployeeRolesAsync(db, orgId, ct);
    }

    /// <summary>Системные роли (IsSystem=true): Администратор / Менеджер /
    /// Кладовщик / Кассир / Закупщик / Бухгалтер. Сидируется один раз
    /// per организацию; обновлять не пытаемся, чтобы не сбросить кастомные
    /// правки галок которые админ мог сделать.</summary>
    private static async Task SeedEmployeeRolesAsync(AppDbContext db, Guid orgId, CancellationToken ct)
    {
        var anyRole = await db.EmployeeRoles.IgnoreQueryFilters().AnyAsync(r => r.OrganizationId == orgId, ct);
        if (anyRole) return;

        var admin = new EmployeeRole
        {
            OrganizationId = orgId,
            Name = "Администратор",
            Description = "Полный доступ ко всем разделам организации",
            IsSystem = true, SortOrder = 0,
            Permissions = RolePermissions.All(),
        };
        // Менеджер/Кладовщик/Закупщик/Бухгалтер — кастомные шаблоны (IsSystem=false),
        // юзер может удалить или подкрутить под себя. Системные только Администратор + Кассир.
        var manager = new EmployeeRole
        {
            OrganizationId = orgId,
            Name = "Менеджер",
            Description = "Управление каталогом, документами и контрагентами",
            IsSystem = false, SortOrder = 10,
            Permissions = new RolePermissions
            {
                ProductsView = true, ProductsEdit = true, ProductGroupsManage = true, PriceTypesManage = true,
                SuppliesView = true, SuppliesEdit = true, SuppliesPost = true,
                CounterpartiesView = true, CounterpartiesEdit = true,
                ReportsView = true, StocksView = true,
            },
        };
        var keeper = new EmployeeRole
        {
            OrganizationId = orgId,
            Name = "Кладовщик",
            Description = "Приёмки, инвентаризация, остатки",
            IsSystem = false, SortOrder = 20,
            Permissions = new RolePermissions
            {
                ProductsView = true,
                SuppliesView = true, SuppliesEdit = true, SuppliesPost = true,
                StocksView = true,
            },
        };
        var cashier = new EmployeeRole
        {
            OrganizationId = orgId,
            Name = "Кассир",
            Description = "Только работа на кассе. Без доступа к веб-админке.",
            IsSystem = true, SortOrder = 30,
            Permissions = new RolePermissions
            {
                ProductsView = true,
                StocksView = true,
                RetailSalesOperate = true,
                // RetailSalesRefund по умолчанию false — админ включит при необходимости
            },
        };
        var buyer = new EmployeeRole
        {
            OrganizationId = orgId,
            Name = "Закупщик",
            Description = "Заказы поставщикам и приёмка товара",
            IsSystem = false, SortOrder = 40,
            Permissions = new RolePermissions
            {
                ProductsView = true,
                SuppliesView = true, SuppliesEdit = true,
                CounterpartiesView = true, CounterpartiesEdit = true,
            },
        };
        var accountant = new EmployeeRole
        {
            OrganizationId = orgId,
            Name = "Бухгалтер",
            Description = "Просмотр всех данных и отчётов, без редактирования",
            IsSystem = false, SortOrder = 50,
            Permissions = new RolePermissions
            {
                ProductsView = true,
                SuppliesView = true,
                CounterpartiesView = true,
                ReportsView = true, StocksView = true,
            },
        };

        db.EmployeeRoles.AddRange(admin, manager, keeper, cashier, buyer, accountant);
        await db.SaveChangesAsync(ct);
    }

    public Task StopAsync(CancellationToken ct) => Task.CompletedTask;
}