using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using ROLAC.API.Entities;

namespace ROLAC.API.Data;

public static class DbSeeder
{
    private static readonly (string En, string Zh, int Sort)[] GivingCategorySeed =
    [
        ("Tithe",            "什一奉獻", 1),
        ("General Offering", "一般奉獻", 2),
        ("Special Offering", "特別奉獻", 3),
        ("Building Fund",    "建堂基金", 4),
        ("Mission",          "宣教奉獻", 5),
    ];

    private static readonly (string En, string Zh, int Sort)[] MinistrySeed =
    [
        ("Administration", "行政",     1),
        ("Preaching",      "講道",     2),
        ("Emcee",          "司會",     3),
        ("Worship",        "敬拜",     4),
        ("PPT/Media",      "PPT/影音", 5),
        ("Sound",          "音控",     6),
        ("Facility",       "場地組",   7),
        ("Hospitality",    "招待",     8),
        ("Children",       "兒牧",     9),
        ("Catering",       "餐飲",    10),
    ];

    // (GroupEn, GroupZh, Sort, SubItems[(SubEn, SubZh)])
    private static readonly (string En, string Zh, int Sort, (string En, string Zh)[] Subs)[] ExpenseCategorySeed =
    [
        ("Equipment", "設備", 1, [("Purchase","購置"),("Rental","租借"),("Maintenance & Repair","維修")]),
        ("Consumables", "消耗品", 2, [("Batteries","電池"),("Accessories","配件"),("Cleaning Supplies","清潔用品"),("Office Supplies","文具")]),
        ("Food & Beverage", "餐飲", 3, [("Catering","出餐費用"),("Food Ingredients","食材採購"),("Utensils","器具"),("Consumables","消耗品")]),
        ("Training", "培訓", 4, [("Course Fees","課程費用"),("Books","書籍"),("Conference","研討會"),("Travel","差旅")]),
        ("Materials", "教材", 5, [("Printing","印刷費用"),("Craft Supplies","手工材料"),("Copyright & Licensing","版權購買")]),
        ("Facility", "場地", 6, [("Rent","場地租金"),("Utilities","水電"),("Property Insurance","財產保險"),("Decoration","裝飾")]),
        ("Printing", "印刷", 7, [("Bulletins","週報"),("Order of Service","程序單"),("Posters","海報")]),
        ("Missions", "宣教", 8, [("Offering Transfer","奉獻轉帳"),("Missionary Support","宣教士支援"),("Travel","差旅")]),
        ("Benevolence", "關懷救助", 9, [("Emergency Aid","急難救助"),("Condolence Gifts","慰問禮品"),("Visit Expenses","探訪費用")]),
        ("Other", "其他", 10, [("Miscellaneous","雜支")]),
        ("Personnel", "人事", 11, [("Salary & Wages","薪資"),("Payroll Taxes","薪資稅費"),("Employee Benefits","員工福利"),("Workers Compensation","勞工保險"),("Honorarium","酬庸"),("Staff Training","同工進修"),("Contract Labor","外包勞務")]),
    ];

    private static readonly (string Name, string Description)[] Roles =
    [
        ("super_admin",     "System administrator — full access"),
        ("pastor",          "Pastor — full member and financial overview"),
        ("board_member",    "Board member — church governance"),
        ("coworker_chair",  "Coworker chair — coordinates ministry leaders"),
        ("ministry_leader", "Ministry leader — scoped to own ministry"),
        ("district_leader", "District leader — manages multiple cell groups"),
        ("cell_leader",     "Cell leader — scoped to own cell group"),
        ("coworker",        "Coworker — general worker in assigned ministry"),
        ("finance",         "Finance — manages giving and expense reports"),
        ("secretary",       "Secretary — manages member data and scheduling"),
        ("worship_leader",  "Worship leader — manages song library and setlists (Phase deferred)"),
        ("member",          "Member — views own profile and service roster"),
        ("visitor",         "Visitor — public pages only"),
    ];

    public static async Task SeedRolesAsync(RoleManager<AppRole> roleManager)
    {
        foreach (var (name, description) in Roles)
        {
            if (!await roleManager.RoleExistsAsync(name))
            {
                await roleManager.CreateAsync(new AppRole
                {
                    Name        = name,
                    Description = description,
                });
            }
        }
    }

    public static async Task SeedGivingCategoriesAsync(AppDbContext db)
    {
        foreach (var (en, zh, sort) in GivingCategorySeed)
        {
            if (!await db.GivingCategories.AnyAsync(c => c.Name_en == en))
            {
                db.GivingCategories.Add(new GivingCategory
                {
                    Name_en   = en,
                    Name_zh   = zh,
                    SortOrder = sort,
                    IsActive  = true,
                    // Audit fields are stamped by AuditSaveChangesInterceptor on save.
                });
            }
        }
        await db.SaveChangesAsync();
    }

    public static async Task SeedMinistriesAsync(AppDbContext db)
    {
        foreach (var (en, zh, sort) in MinistrySeed)
        {
            if (!await db.Ministries.AnyAsync(m => m.Name_en == en))
                db.Ministries.Add(new Ministry { Name_en = en, Name_zh = zh, SortOrder = sort, IsActive = true });
        }
        await db.SaveChangesAsync();
    }

    public static async Task SeedExpenseCategoriesAsync(AppDbContext db)
    {
        foreach (var (gEn, gZh, gSort, subs) in ExpenseCategorySeed)
        {
            var group = await db.ExpenseCategoryGroups.FirstOrDefaultAsync(g => g.Name_en == gEn);
            if (group is null)
            {
                group = new ExpenseCategoryGroup { Name_en = gEn, Name_zh = gZh, SortOrder = gSort, IsActive = true };
                db.ExpenseCategoryGroups.Add(group);
                await db.SaveChangesAsync(); // assign group.Id
            }

            var sub = 1;
            foreach (var (sEn, sZh) in subs)
            {
                if (!await db.ExpenseSubCategories.AnyAsync(s => s.GroupId == group.Id && s.Name_en == sEn))
                    db.ExpenseSubCategories.Add(new ExpenseSubCategory
                        { GroupId = group.Id, Name_en = sEn, Name_zh = sZh, SortOrder = sub, IsActive = true });
                sub++;
            }
        }
        await db.SaveChangesAsync();
    }

    public static async Task SeedChurchProfileAsync(AppDbContext db)
    {
        // Singleton row used by the disbursement module (issuer info + check counter).
        if (!await db.ChurchProfiles.AnyAsync())
        {
            db.ChurchProfiles.Add(new ChurchProfile
            {
                Name            = "River Of Life Christian Church",
                City            = "Arcadia",
                State           = "CA",
                NextCheckNumber = 1001,
            });
            await db.SaveChangesAsync();
        }
    }

    /// <summary>
    /// Seeds roles and (in Development) the default admin account.
    /// Called once on application startup after migrations have been applied.
    /// </summary>
    public static async Task SeedAsync(IServiceProvider services)
    {
        var roleManager = services.GetRequiredService<RoleManager<AppRole>>();
        var userManager = services.GetRequiredService<UserManager<AppUser>>();
        var env         = services.GetRequiredService<IWebHostEnvironment>();

        await SeedRolesAsync(roleManager);

        var db = services.GetRequiredService<AppDbContext>();
        await SeedGivingCategoriesAsync(db);
        await SeedMinistriesAsync(db);
        await SeedExpenseCategoriesAsync(db);
        await SeedChurchProfileAsync(db);

        if (env.IsDevelopment())
            await SeedAdminUserAsync(userManager);
    }

    /// <summary>
    /// Creates a super_admin test account for local development.
    /// DO NOT call this in production — remove or guard with IsDevelopment().
    /// Credentials: admin@rolac.org / Admin1234!
    /// </summary>
    public static async Task SeedAdminUserAsync(UserManager<AppUser> userManager)
    {
        const string adminEmail    = "admin@rolac.org";
        const string adminPassword = "Admin1234!";

        if (await userManager.FindByEmailAsync(adminEmail) is null)
        {
            var admin = new AppUser
            {
                UserName           = adminEmail,
                Email              = adminEmail,
                EmailConfirmed     = true,
                IsActive           = true,
                LanguagePreference = "en",
                CreatedAt          = DateTime.UtcNow,
            };

            var result = await userManager.CreateAsync(admin, adminPassword);
            if (result.Succeeded)
                await userManager.AddToRoleAsync(admin, "super_admin");
        }
    }
}