using Fitness_core_BE.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;

namespace Fitness_core_BE
{
    // Central database: data that is inherently cross-tenant -- customer identity, the
    // client/gym registry, admin data, admin-authored plan templates, and platform billing.
    // See docs/AppDBContext split rationale in the migration plan. Row-split entities
    // (MealPlan/WorkoutPlan family, PaymentTransactions) also live here for template /
    // platform-billing rows -- TenantDbContext holds the same entity types for the
    // client-owned / member-payment rows.
    public class CentralDbContext : DbContext
    {
        public CentralDbContext(DbContextOptions<CentralDbContext> options) : base(options) { }

        // Identity & tenant registry
        public DbSet<User> Users => Set<User>();
        public DbSet<Admin> Admins => Set<Admin>();
        public DbSet<Customer> Customer => Set<Customer>();
        public DbSet<Client> Client => Set<Client>();
        public DbSet<ClientBusiness> ClientBusiness => Set<ClientBusiness>();
        // Agent/PairingCode stay central: Agent authenticates purely via X-Api-Key (no JWT at
        // all), and PairingCode is created by platform Admin and consumed by an anonymous agent
        // enroll call -- neither has any tenant-scoping mechanism to key off of.
        public DbSet<Agent> Agents => Set<Agent>();
        public DbSet<PairingCode> PairingCodes => Set<PairingCode>();

        // Background-job run history (SubscriptionRenewalJob, etc.) -- central because it's
        // not gym-operational data, just an audit trail of what each sweep did.
        public DbSet<JobRunLog> JobRunLogs => Set<JobRunLog>();

        // Customer-follows-you-everywhere data
        public DbSet<CustomerHealth> CustomerHealth => Set<CustomerHealth>();
        public DbSet<CustomerTarget> CustomerTargets => Set<CustomerTarget>();
        public DbSet<CusWeightLossProgress> CusWeightLossProgress => Set<CusWeightLossProgress>();
        public DbSet<CustomerNotification> CustomerNotifications => Set<CustomerNotification>();

        // Admin-authored plan templates (IsTemplate=true / FKClientId=null rows only)
        public DbSet<MealCategory> MealCategories => Set<MealCategory>();
        public DbSet<MealPlan> MealPlans => Set<MealPlan>();
        public DbSet<Meal> Meal => Set<Meal>();
        public DbSet<WorkoutCategory> WorkoutCategories => Set<WorkoutCategory>();
        public DbSet<WorkoutPlan> WorkoutPlans => Set<WorkoutPlan>();
        public DbSet<WorkoutItem> WorkoutItems => Set<WorkoutItem>();
        public DbSet<WorkoutExercise> WorkoutExercises => Set<WorkoutExercise>();

        // Support / global catalog
        public DbSet<Ticket> Tickets => Set<Ticket>();
        public DbSet<TicketCategory> TicketCategories => Set<TicketCategory>();
        public DbSet<TicketMessage> TicketMessages => Set<TicketMessage>();
        public DbSet<NavItem> NavItems => Set<NavItem>();
        public DbSet<UserDocument> UserDocuments => Set<UserDocument>();
        public DbSet<DocumentTypes> DocumentTypes => Set<DocumentTypes>();

        // Platform billing (HexaFitness -> gym)
        public DbSet<ClientInvoice> ClientInvoices => Set<ClientInvoice>();
        public DbSet<ClientCard> ClientCard => Set<ClientCard>();
        public DbSet<ClientInvoiceItem> ClientInvoiceItems => Set<ClientInvoiceItem>();
        public DbSet<ClientSubscription> ClientSubscriptions => Set<ClientSubscription>();
        public DbSet<ClientSubItems> ClientSubItems => Set<ClientSubItems>();
        public DbSet<ClientPackage> ClientPackages => Set<ClientPackage>();
        public DbSet<ClientPayoutKyc> ClientPayoutKycs => Set<ClientPayoutKyc>();
        public DbSet<ClientWallet> ClientWallets => Set<ClientWallet>();
        public DbSet<WalletLedgerEntry> WalletLedgerEntries => Set<WalletLedgerEntry>();
        public DbSet<PayoutBatch> PayoutBatches => Set<PayoutBatch>();
        public DbSet<DevicePricingConfig> DevicePricingConfigs => Set<DevicePricingConfig>();
        public DbSet<ClientDeviceBilling> ClientDeviceBillings => Set<ClientDeviceBilling>();
        // Row-split: only rows with FK_ClientInvoiceId set (platform billing payments) live
        // here -- member payments (FK_CustomerInvoiceId set) live in TenantDbContext instead.
        public DbSet<PaymentTransaction> PaymentTransactions => Set<PaymentTransaction>();

        // Ambiguous scope today (no FKClientId on the model) -- kept central pending the
        // Phase-2 confirmation spike called out in the migration plan.
        public DbSet<FeedPost> FeedPosts => Set<FeedPost>();
        public DbSet<FeedLike> FeedLikes => Set<FeedLike>();
        public DbSet<ActivityLog> ActivityLogs => Set<ActivityLog>();
        public DbSet<Chat> Chat => Set<Chat>();
        public DbSet<ChatMessages> ChatMessages => Set<ChatMessages>();

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            // Tenant-only entity types must never be part of this model at all. Ignoring
            // individual navigations (below) isn't enough on its own: an unignored tenant
            // collection/reference nav anywhere in the reachable graph (e.g.
            // CustomerSubscription.AutoChargeCard -> CustomerCards, CustomerInvoice.
            // CustomerSubscription) pulls the whole type into this context's model via EF's
            // reachability-based discovery, which can then invent a bogus shadow-FK
            // relationship between that type and whatever OTHER entity also happens to have
            // a real FK to it -- breaking queries with "Unknown column" once EF tries to
            // select a column that doesn't exist in the central schema. Same failure mode
            // proven and fixed on the TenantDbContext side (see its OnModelCreating) --
            // mirrored here in the opposite direction. Row-split entities (MealPlan/
            // WorkoutPlan family, PaymentTransaction) are deliberately NOT in this list --
            // they have real DbSets in both contexts.
            modelBuilder.Ignore<TenantCustomerLink>();
            modelBuilder.Ignore<Staff>();
            modelBuilder.Ignore<StaffPayRate>();
            modelBuilder.Ignore<StaffPayment>();
            modelBuilder.Ignore<GymRole>();
            modelBuilder.Ignore<GymRolePermission>();
            modelBuilder.Ignore<CustomerPlan>();
            modelBuilder.Ignore<CustomerSubscription>();
            modelBuilder.Ignore<SubscriptionMember>();
            modelBuilder.Ignore<SubscriptionInstallment>();
            modelBuilder.Ignore<CustomerSubItem>();
            modelBuilder.Ignore<CustomerInvoice>();
            modelBuilder.Ignore<CustomerInvoiceItem>();
            modelBuilder.Ignore<CustomerCards>();
            modelBuilder.Ignore<LedgerEntry>();
            modelBuilder.Ignore<ClientTerms>();
            modelBuilder.Ignore<CustomerTermsAcceptance>();
            modelBuilder.Ignore<AccessDevice>();
            modelBuilder.Ignore<AccessDeviceBinding>();
            modelBuilder.Ignore<AccessProfile>();
            modelBuilder.Ignore<UnlinkedDeviceEnrollment>();
            modelBuilder.Ignore<CustomerAccess>();
            modelBuilder.Ignore<DeviceCommand>();
            modelBuilder.Ignore<Attendance>();
            modelBuilder.Ignore<CustomerMeal>();
            modelBuilder.Ignore<CustomerWorkout>();
            modelBuilder.Ignore<CustomerWorkoutExerciseCompletion>();

            modelBuilder.Entity<Agent>()
                .HasIndex(a => a.ApiKeyHash)
                .IsUnique();
            modelBuilder.Entity<JobRunLog>()
                .HasIndex(r => new { r.JobName, r.RunAtUtc });

            // Row-split entities: no FKClientId relationship enforced here (template rows
            // have FKClientId = null; the rare non-null value on a row that ended up in this
            // DB isn't a real cross-schema FK once tenants split out).
            modelBuilder.Entity<MealPlan>().Ignore(p => p.Client);
            modelBuilder.Entity<WorkoutPlan>().Ignore(p => p.Client);
            modelBuilder.Entity<PaymentTransaction>().Ignore(p => p.Client);
            modelBuilder.Entity<PaymentTransaction>().Ignore(p => p.Customer);
            modelBuilder.Entity<PaymentTransaction>().Ignore(p => p.CustomerCard);
            modelBuilder.Entity<PaymentTransaction>().Ignore(p => p.CustomerInvoice);

            // Customer's collection navigations into tenant-only entities -- not resolvable
            // here; load those separately from TenantDbContext and merge in the caller.
            modelBuilder.Entity<Customer>().Ignore(c => c.CustomerWorkouts);
            modelBuilder.Entity<Customer>().Ignore(c => c.CustomerMeals);
            modelBuilder.Entity<Customer>().Ignore(c => c.CustomerSubscriptions);

            modelBuilder.Entity<NavItem>().HasData(
                new NavItem { Key = "dashboard", Label = "Dashboard", ShortLabel = "Home", Href = "/dashboard", Icon = "LayoutDashboard", SortOrder = 0, IsOwnerOnly = false },
                new NavItem { Key = "attendance", Label = "Attendance", Href = "/dashboard/attendance", Icon = "CalendarCheck", SortOrder = 1, IsOwnerOnly = false },
                new NavItem { Key = "members", Label = "Members", Href = "/dashboard/members", Icon = "Users", SortOrder = 2, IsOwnerOnly = false },
                new NavItem { Key = "memberships", Label = "Memberships", Href = "/dashboard/memberships", Icon = "CreditCard", SortOrder = 3, IsOwnerOnly = false },
                new NavItem { Key = "bookings", Label = "Bookings", Href = "/dashboard/bookings", Icon = "CalendarClock", SortOrder = 4, IsOwnerOnly = false },
                new NavItem { Key = "customer-payments", Label = "Customer Payments", ShortLabel = "Payments", Href = "/dashboard/customer-payments", Icon = "Receipt", SortOrder = 5, IsOwnerOnly = false },
                new NavItem { Key = "inventory", Label = "Inventory", Href = "/dashboard/inventory", Icon = "Package", SortOrder = 6, IsOwnerOnly = false },
                new NavItem { Key = "workout-plans", Label = "Workout Plans", Href = "/dashboard/workout-plans", Icon = "Activity", SortOrder = 7, IsOwnerOnly = false },
                new NavItem { Key = "meal-plans", Label = "Meal Plans", Href = "/dashboard/meal-plans", Icon = "Utensils", SortOrder = 8, IsOwnerOnly = false },
                new NavItem { Key = "staff", Label = "Staff", Href = "/dashboard/staff", Icon = "UsersRound", SortOrder = 9, IsOwnerOnly = false },
                new NavItem { Key = "feed", Label = "Feed", Href = "/dashboard/feed", Icon = "Rss", SortOrder = 10, IsOwnerOnly = false },
                new NavItem { Key = "tickets", Label = "Tickets", Href = "/dashboard/tickets", Icon = "TicketIcon", SortOrder = 11, IsOwnerOnly = false },
                new NavItem { Key = "reports", Label = "Reports", Href = "/dashboard/reports", Icon = "BarChart3", SortOrder = 12, IsOwnerOnly = false },
                new NavItem { Key = "settings", Label = "Gym Profile", Href = "/dashboard/settings", Icon = "Settings", SortOrder = 13, IsOwnerOnly = true }
            );

            modelBuilder.Entity<DocumentTypes>().HasData(
                new DocumentTypes { DocumentId = 1001, DocumentType = "NIC_FRONT" },
                new DocumentTypes { DocumentId = 1002, DocumentType = "NIC_BACK" },
                new DocumentTypes { DocumentId = 1003, DocumentType = "BR_CERTIFICATE" },
                new DocumentTypes { DocumentId = 1004, DocumentType = "BANK_PROOF" },
                // Images/video attached to a feed post -- FeedService.CreateFeed tags its
                // uploads with this id, so the row has to exist or the UserDocuments FK fails.
                new DocumentTypes { DocumentId = 1005, DocumentType = "FEED_POST" },
                // Profile picture uploads (CustomerController/ClientController) tag with this id.
                new DocumentTypes { DocumentId = 1006, DocumentType = "PROFILE_IMAGE" }
            );

            modelBuilder.Entity<User>().HasData(
                new User
                {
                    UserId = AIAgents.MealAgentId,
                    UserName = "MealPlan AI",
                    Email = "meal.ai@system.local",
                    PhoneNumber = null,
                    IsActive = true,
                    CreateDate = new DateTime(2025, 1, 1, 0, 0, 0, DateTimeKind.Utc)
                },
                new User
                {
                    UserId = AIAgents.WorkoutAgentId,
                    UserName = "WorkoutPlan AI",
                    Email = "workout.ai@system.local",
                    PhoneNumber = null,
                    IsActive = true,
                    CreateDate = new DateTime(2025, 1, 1, 0, 0, 0, DateTimeKind.Utc)
                }
            );

            // Platform-wide "coach guided" suggested workout plans -- admin templates.
            modelBuilder.Entity<WorkoutCategory>().HasData(Data.WorkoutPlanSeedData.Categories());
            modelBuilder.Entity<WorkoutPlan>().HasData(Data.WorkoutPlanSeedData.Plans());
            modelBuilder.Entity<WorkoutItem>().HasData(Data.WorkoutPlanSeedData.Items());
            modelBuilder.Entity<WorkoutExercise>().HasData(Data.WorkoutPlanSeedData.Exercises());
        }
    }

    public class CentralDbContextFactory : IDesignTimeDbContextFactory<CentralDbContext>
    {
        public CentralDbContext CreateDbContext(string[] args)
        {
            var env = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Development";
            var config = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", optional: false)
                .AddJsonFile($"appsettings.{env}.json", optional: true)
                .Build();

            var optionsBuilder = new DbContextOptionsBuilder<CentralDbContext>();
            var connectionString = config.GetConnectionString("DefaultConnection");
            optionsBuilder.UseMySql(connectionString, new MySqlServerVersion(new Version(8, 0, 0)));

            return new CentralDbContext(optionsBuilder.Options);
        }
    }
}