using Microsoft.EntityFrameworkCore;
using Tiku.Application.Security;
using Tiku.Domain.Common;
using Tiku.Domain.Operations;
using Tiku.Domain.Platform;
using Tiku.Domain.Tenancy;
using Tiku.Infrastructure.Persistence;

namespace Tiku.Infrastructure.Bootstrap;

public sealed class BuiltinBackofficeCatalogSeeder(TikuDbContext dbContext)
{
    private static readonly BuiltinFeature[] Features =
    [
        new(SaasFeatureCatalog.CoreBackoffice, "后台基础能力", "core", true, 0),
        new(SaasFeatureCatalog.PrivateQuestionBank, "私有题库", "question_bank", false, 10),
        new(SaasFeatureCatalog.Practice, "题库练习", "learning", false, 20),
        new(SaasFeatureCatalog.Assignment, "作业", "learning", false, 30),
        new(SaasFeatureCatalog.Exam, "考试", "learning", false, 40),
        new(SaasFeatureCatalog.Vocabulary, "词汇", "content", false, 50),
        new(SaasFeatureCatalog.Handbook, "知识手册", "content", false, 60),
        new(SaasFeatureCatalog.Video, "视频", "content", false, 70),
        new(SaasFeatureCatalog.Scoreline, "分数线", "content", false, 80),
        new(SaasFeatureCatalog.SiteContent, "站点运营内容", "marketing", false, 90),
        new(SaasFeatureCatalog.StudentManagement, "学生管理", "student", false, 100),
        new(SaasFeatureCatalog.StudentStore, "学生商城", "commerce", false, 110),
        new(SaasFeatureCatalog.Crm, "学生跟进", "crm", false, 120),
        new(SaasFeatureCatalog.ReferralCommission, "推广与分佣", "growth", false, 130),
        new(SaasFeatureCatalog.TeacherAi, "教师 AI 助手", "ai", false, 140)
    ];

    private static readonly BuiltinPermissionModule[] PermissionModules =
    [
        new("tenant_dashboard", "租户总览", BackendPermissionArea.Tenant, null, 10),
        new("tenant_staff", "员工与角色", BackendPermissionArea.Tenant, null, 20),
        new("tenant_settings", "租户设置", BackendPermissionArea.Tenant, null, 30),
        new("tenant_provider", "外部服务", BackendPermissionArea.Tenant, null, 40),
        new("tenant_job", "后台任务", BackendPermissionArea.Tenant, null, 50),
        new("tenant_billing", "SaaS 账务", BackendPermissionArea.Tenant, null, 60),
        new("tenant_student", "学生管理", BackendPermissionArea.Tenant, SaasFeatureCatalog.StudentManagement, 100),
        new("tenant_question_bank", "私有题库", BackendPermissionArea.Tenant, SaasFeatureCatalog.PrivateQuestionBank, 110),
        new("tenant_vocabulary", "词汇", BackendPermissionArea.Tenant, SaasFeatureCatalog.Vocabulary, 120),
        new("tenant_handbook", "知识手册", BackendPermissionArea.Tenant, SaasFeatureCatalog.Handbook, 130),
        new("tenant_video", "视频", BackendPermissionArea.Tenant, SaasFeatureCatalog.Video, 140),
        new("tenant_scoreline", "分数线", BackendPermissionArea.Tenant, SaasFeatureCatalog.Scoreline, 150),
        new("tenant_site_content", "站点运营内容", BackendPermissionArea.Tenant, SaasFeatureCatalog.SiteContent, 160),
        new("tenant_commerce", "学生商城", BackendPermissionArea.Tenant, SaasFeatureCatalog.StudentStore, 170),
        new("tenant_crm", "学生跟进", BackendPermissionArea.Tenant, SaasFeatureCatalog.Crm, 180),
        new("tenant_commission", "推广分佣", BackendPermissionArea.Tenant, SaasFeatureCatalog.ReferralCommission, 190),
        new("platform_dashboard", "平台总览", BackendPermissionArea.Platform, null, 200),
        new("platform_tenant", "平台租户", BackendPermissionArea.Platform, null, 210),
        new("platform_staff", "平台员工", BackendPermissionArea.Platform, null, 220),
        new("platform_content", "公共题库", BackendPermissionArea.Platform, null, 230),
        new("platform_audit", "平台审计", BackendPermissionArea.Platform, null, 240),
        new("platform_billing", "平台 SaaS 商城", BackendPermissionArea.Platform, null, 250),
        new("platform_crm", "CRM 接入代管", BackendPermissionArea.Platform, null, 260),
        new("platform_sms", "短信服务", BackendPermissionArea.Platform, null, 270),
        new("platform_payment", "支付设置", BackendPermissionArea.Platform, null, 280),
        new("commerce", "交易运营", BackendPermissionArea.Both, SaasFeatureCatalog.StudentStore, 300)
    ];

    private static readonly BuiltinPermission[] Permissions =
    [
        new(BackendPermissions.TenantDashboardView, "租户总览", BackendPermissionArea.Tenant, "tenant_dashboard"),
        new(BackendPermissions.TenantStaffManage, "租户员工管理", BackendPermissionArea.Tenant, "tenant_staff"),
        new(BackendPermissions.TenantRoleManage, "租户角色权限管理", BackendPermissionArea.Tenant, "tenant_staff"),
        new(BackendPermissions.TenantStudentManage, "学生与班级管理", BackendPermissionArea.Tenant, "tenant_student"),
        new(BackendPermissions.TenantContentManage, "租户题库管理", BackendPermissionArea.Tenant, "tenant_question_bank"),
        new(BackendPermissions.TenantVocabularyManage, "租户词汇管理", BackendPermissionArea.Tenant, "tenant_vocabulary"),
        new(BackendPermissions.TenantHandbookManage, "租户手册管理", BackendPermissionArea.Tenant, "tenant_handbook"),
        new(BackendPermissions.TenantVideoManage, "租户视频管理", BackendPermissionArea.Tenant, "tenant_video"),
        new(BackendPermissions.TenantScorelineManage, "租户分数线管理", BackendPermissionArea.Tenant, "tenant_scoreline"),
        new(BackendPermissions.TenantSiteContentManage, "租户运营内容管理", BackendPermissionArea.Tenant, "tenant_site_content"),
        new(BackendPermissions.TenantSettingsManage, "租户设置管理", BackendPermissionArea.Tenant, "tenant_settings"),
        new(BackendPermissions.TenantProviderManage, "租户外部服务配置", BackendPermissionArea.Tenant, "tenant_provider"),
        new(BackendPermissions.TenantCommerceOperate, "租户交易运营", BackendPermissionArea.Tenant, "tenant_commerce"),
        new(BackendPermissions.TenantCrmManage, "租户客户管理", BackendPermissionArea.Tenant, "tenant_crm"),
        new(BackendPermissions.TenantCommissionManage, "租户佣金管理", BackendPermissionArea.Tenant, "tenant_commission"),
        new(BackendPermissions.TenantJobManage, "租户任务管理", BackendPermissionArea.Tenant, "tenant_job"),
        new(BackendPermissions.TenantBillingManage, "租户 SaaS 账务", BackendPermissionArea.Tenant, "tenant_billing"),
        new(BackendPermissions.PlatformDashboardView, "平台总览", BackendPermissionArea.Platform, "platform_dashboard"),
        new(BackendPermissions.PlatformTenantManage, "平台租户管理", BackendPermissionArea.Platform, "platform_tenant"),
        new(BackendPermissions.PlatformStaffManage, "平台员工管理", BackendPermissionArea.Platform, "platform_staff"),
        new(BackendPermissions.PlatformRoleManage, "平台角色权限管理", BackendPermissionArea.Platform, "platform_staff"),
        new(BackendPermissions.PlatformQuestionBankManage, "平台公共题库运营", BackendPermissionArea.Platform, "platform_content"),
        new(BackendPermissions.PlatformAuditView, "平台审计查询", BackendPermissionArea.Platform, "platform_audit"),
        new(BackendPermissions.PlatformBillingNotification, "平台催缴通知", BackendPermissionArea.Platform, "platform_billing"),
        new(BackendPermissions.PlatformSaasCatalogManage, "SaaS 商品管理", BackendPermissionArea.Platform, "platform_billing"),
        new(BackendPermissions.PlatformSaasBillingManage, "SaaS 交易管理", BackendPermissionArea.Platform, "platform_billing"),
        new(BackendPermissions.PlatformCrmRead, "平台 CRM 查询", BackendPermissionArea.Platform, "platform_crm"),
        new(BackendPermissions.PlatformCrmWrite, "平台 CRM 管理", BackendPermissionArea.Platform, "platform_crm"),
        new(BackendPermissions.PlatformSmsRead, "平台短信查询", BackendPermissionArea.Platform, "platform_sms"),
        new(BackendPermissions.PlatformSmsWrite, "平台短信管理", BackendPermissionArea.Platform, "platform_sms"),
        new(BackendPermissions.PlatformPaymentRead, "平台支付查询", BackendPermissionArea.Platform, "platform_payment"),
        new(BackendPermissions.PlatformPaymentWrite, "平台支付管理", BackendPermissionArea.Platform, "platform_payment"),
        new("commerce:refund:approve", "退款审核", BackendPermissionArea.Both, "commerce"),
        new("commerce:reconciliation:manage", "对账管理", BackendPermissionArea.Both, "commerce"),
        new("commerce:adjustment:manage", "调账管理", BackendPermissionArea.Both, "commerce")
    ];

    private static readonly BuiltinMenu[] Menus =
    [
        new("tenant.dashboard", null, "租户总览", BackendPermissionArea.Tenant, "/tenant/dashboard", "tenant:dashboard:view", 10),
        new("tenant.staff", null, "员工与权限", BackendPermissionArea.Tenant, "/tenant/staff", "tenant:staff:manage", 20),
        new("tenant.students", null, "班级与学生", BackendPermissionArea.Tenant, "/tenant/students", "tenant:student:manage", 30),
        new("tenant.question-bank", null, "私有题库", BackendPermissionArea.Tenant, "/tenant/question-bank", BackendPermissions.TenantContentManage, 40),
        new("tenant.vocabulary", null, "词汇", BackendPermissionArea.Tenant, "/tenant/vocabulary", BackendPermissions.TenantVocabularyManage, 50),
        new("tenant.handbook", null, "知识手册", BackendPermissionArea.Tenant, "/tenant/handbook", BackendPermissions.TenantHandbookManage, 60),
        new("tenant.video", null, "视频", BackendPermissionArea.Tenant, "/tenant/video", BackendPermissions.TenantVideoManage, 70),
        new("tenant.scoreline", null, "分数线", BackendPermissionArea.Tenant, "/tenant/scoreline", BackendPermissions.TenantScorelineManage, 80),
        new("tenant.site-content", null, "运营内容", BackendPermissionArea.Tenant, "/tenant/site-content", BackendPermissions.TenantSiteContentManage, 90),
        new("tenant.providers", null, "外部服务", BackendPermissionArea.Tenant, "/tenant/providers", BackendPermissions.TenantProviderManage, 100),
        new("tenant.commerce", null, "交易运营", BackendPermissionArea.Tenant, "/tenant/commerce", BackendPermissions.TenantCommerceOperate, 110),
        new("tenant.billing", null, "SaaS 账务", BackendPermissionArea.Tenant, "/tenant/billing", BackendPermissions.TenantBillingManage, 120),
        new("platform.dashboard", null, "平台总览", BackendPermissionArea.Platform, "/platform/dashboard", "platform:dashboard:view", 10),
        new("platform.tenants", null, "租户管理", BackendPermissionArea.Platform, "/platform/tenants", "platform:tenant:manage", 20),
        new("platform.staff", null, "平台员工", BackendPermissionArea.Platform, "/platform/staff", "platform:staff:manage", 30),
        new("platform.content", null, "公共题库", BackendPermissionArea.Platform, "/platform/question-banks", "platform:question-bank:manage", 40),
        new("platform.audit", null, "平台审计", BackendPermissionArea.Platform, "/platform/audit", "platform:audit:view", 50),
        new("platform.saas", null, "SaaS 商城", BackendPermissionArea.Platform, "/platform/saas", "platform:saas-catalog:manage", 60),
        new("platform.crm", null, "CRM 接入", BackendPermissionArea.Platform, "/platform/crm", BackendPermissions.PlatformCrmRead, 70),
        new("platform.sms", null, "短信服务", BackendPermissionArea.Platform, "/platform/sms", BackendPermissions.PlatformSmsRead, 80),
        new("platform.payment", null, "支付设置", BackendPermissionArea.Platform, "/platform/payment-settings", BackendPermissions.PlatformPaymentRead, 90)
    ];

    public async Task SeedAsync(CancellationToken cancellationToken = default)
    {
        var platformOwnedTenant = await dbContext.Tenants
            .SingleOrDefaultAsync(item => item.Mode == TenantMode.PlatformOwned, cancellationToken);
        if (platformOwnedTenant is null)
        {
            dbContext.Tenants.Add(new Tenant
            {
                Slug = "platform-public-content",
                Name = "平台公共内容",
                Status = TenantStatus.Active,
                Mode = TenantMode.PlatformOwned,
                BillingStatus = BillingStatus.Active,
                Metadata = JsonDefaults.Object()
            });
        }

        var featureCodes = Features.Select(item => item.Code).ToArray();
        var existingFeatureCodes = await dbContext.SaasFeatures.AsNoTracking()
            .Where(item => featureCodes.Contains(item.Code))
            .Select(item => item.Code)
            .ToHashSetAsync(StringComparer.Ordinal, cancellationToken);

        var moduleCodes = PermissionModules.Select(item => item.Code).ToArray();
        var existingModuleCodes = await dbContext.PermissionModules.AsNoTracking()
            .Where(item => moduleCodes.Contains(item.Code))
            .Select(item => item.Code)
            .ToHashSetAsync(StringComparer.Ordinal, cancellationToken);

        var permissionCodes = Permissions.Select(item => item.Code).ToArray();
        var existingPermissionCodes = await dbContext.BackendPermissions.AsNoTracking()
            .Where(item => permissionCodes.Contains(item.Code))
            .Select(item => item.Code)
            .ToHashSetAsync(StringComparer.Ordinal, cancellationToken);

        var menuCodes = Menus.Select(item => item.Code).ToArray();
        var existingMenuCodes = await dbContext.BackendMenus.AsNoTracking()
            .Where(item => menuCodes.Contains(item.Code))
            .Select(item => item.Code)
            .ToHashSetAsync(StringComparer.Ordinal, cancellationToken);

        dbContext.SaasFeatures.AddRange(Features
            .Where(item => !existingFeatureCodes.Contains(item.Code))
            .Select(item => new SaasFeature
            {
                Code = item.Code,
                Name = item.Name,
                Category = item.Category,
                IsCore = item.IsCore,
                Status = SaasFeatureStatus.Active,
                SortOrder = item.SortOrder
            }));
        dbContext.PermissionModules.AddRange(PermissionModules
            .Where(item => !existingModuleCodes.Contains(item.Code))
            .Select(item => new PermissionModule
            {
                Code = item.Code,
                Name = item.Name,
                Area = item.Area,
                RequiredFeatureCode = item.RequiredFeatureCode,
                SortOrder = item.SortOrder
            }));
        dbContext.BackendPermissions.AddRange(Permissions
            .Where(item => !existingPermissionCodes.Contains(item.Code))
            .Select(item => new BackendPermission
            {
                Code = item.Code,
                Name = item.Name,
                Area = item.Area,
                PermissionModuleCode = item.PermissionModuleCode,
                IsSystem = true
            }));
        dbContext.BackendMenus.AddRange(Menus
            .Where(item => !existingMenuCodes.Contains(item.Code))
            .Select(item => new BackendMenu
            {
                Code = item.Code,
                ParentCode = item.ParentCode,
                Title = item.Title,
                Area = item.Area,
                Path = item.Path,
                PermissionCode = item.PermissionCode,
                SortOrder = item.SortOrder,
                IsActive = true
            }));

        var superAdminRoleId = await dbContext.PlatformBackendRoles.AsNoTracking()
            .Where(role => role.Code == PlatformAdminBootstrapper.SuperAdminRoleCode && role.IsSystem)
            .Select(role => (Guid?)role.Id)
            .SingleOrDefaultAsync(cancellationToken);
        if (superAdminRoleId.HasValue)
        {
            var boundPermissionCodes = await dbContext.PlatformBackendRolePermissions.AsNoTracking()
                .Where(binding => binding.RoleId == superAdminRoleId.Value)
                .Select(binding => binding.PermissionCode)
                .ToHashSetAsync(StringComparer.Ordinal, cancellationToken);
            dbContext.PlatformBackendRolePermissions.AddRange(BackendPermissions.Platform
                .Where(code => !boundPermissionCodes.Contains(code))
                .Select(code => new PlatformBackendRolePermission
                {
                    RoleId = superAdminRoleId.Value,
                    PermissionCode = code
                }));
        }

        await dbContext.SaveChangesAsync(cancellationToken);
    }

    private sealed record BuiltinFeature(string Code, string Name, string Category, bool IsCore, int SortOrder);
    private sealed record BuiltinPermissionModule(string Code, string Name, BackendPermissionArea Area, string? RequiredFeatureCode, int SortOrder);
    private sealed record BuiltinPermission(string Code, string Name, BackendPermissionArea Area, string PermissionModuleCode);
    private sealed record BuiltinMenu(string Code, string? ParentCode, string Title, BackendPermissionArea Area, string Path, string PermissionCode, int SortOrder);
}
