using MetaCourse.Api.Entities;
using Microsoft.EntityFrameworkCore;

namespace MetaCourse.Api.Data;

public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
{

    public DbSet<User> Users => Set<User>();
    public DbSet<Course> Courses => Set<Course>();
    public DbSet<Topic> Topics => Set<Topic>();
    public DbSet<Resource> Resources => Set<Resource>();
    public DbSet<TopicResource> TopicResources => Set<TopicResource>();
    public DbSet<UserCourse> UserCourses => Set<UserCourse>();
    public DbSet<UserTopicProgress> UserTopicProgresses => Set<UserTopicProgress>();
    public DbSet<UserResourceProgress> UserResourceProgresses => Set<UserResourceProgress>();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // TopicResource composite key
        modelBuilder.Entity<TopicResource>()
            .HasKey(tr => new { tr.TopicId, tr.ResourceId });

        modelBuilder.Entity<TopicResource>()
            .HasOne(tr => tr.Topic)
            .WithMany(t => t.TopicResources)
            .HasForeignKey(tr => tr.TopicId);

        modelBuilder.Entity<TopicResource>()
            .HasOne(tr => tr.Resource)
            .WithMany(r => r.TopicResources)
            .HasForeignKey(tr => tr.ResourceId);

        // UserCourse composite key
        modelBuilder.Entity<UserCourse>()
            .HasKey(uc => new { uc.UserId, uc.CourseId });

        modelBuilder.Entity<UserCourse>()
            .HasOne(uc => uc.User)
            .WithMany(u => u.UserCourses)
            .HasForeignKey(uc => uc.UserId);

        modelBuilder.Entity<UserCourse>()
            .HasOne(uc => uc.Course)
            .WithMany(c => c.UserCourses)
            .HasForeignKey(uc => uc.CourseId);

        // UserTopicProgress composite key
        modelBuilder.Entity<UserTopicProgress>()
            .HasKey(utp => new { utp.UserId, utp.TopicId });

        modelBuilder.Entity<UserTopicProgress>()
            .HasOne(utp => utp.User)
            .WithMany(u => u.TopicProgresses)
            .HasForeignKey(utp => utp.UserId);

        modelBuilder.Entity<UserTopicProgress>()
            .HasOne(utp => utp.Topic)
            .WithMany(t => t.UserProgresses)
            .HasForeignKey(utp => utp.TopicId);

        // UserResourceProgress composite key
        modelBuilder.Entity<UserResourceProgress>()
            .HasKey(urp => new { urp.UserId, urp.ResourceId });

        modelBuilder.Entity<UserResourceProgress>()
            .HasOne(urp => urp.User)
            .WithMany(u => u.ResourceProgresses)
            .HasForeignKey(urp => urp.UserId);

        modelBuilder.Entity<UserResourceProgress>()
            .HasOne(urp => urp.Resource)
            .WithMany(r => r.UserProgresses)
            .HasForeignKey(urp => urp.ResourceId);

        // Unique email
        modelBuilder.Entity<User>()
            .HasIndex(u => u.Email)
            .IsUnique();

        // Course -> Creator (restrict delete to avoid cascade)
        modelBuilder.Entity<Course>()
            .HasOne(c => c.Creator)
            .WithMany(u => u.CreatedCourses)
            .HasForeignKey(c => c.CreatorId)
            .OnDelete(DeleteBehavior.Restrict);

        // Enum stored as string
        modelBuilder.Entity<Course>()
            .Property(c => c.Status)
            .HasConversion<string>();

        modelBuilder.Entity<Resource>()
            .Property(r => r.Type)
            .HasConversion<string>();

        SeedData(modelBuilder);
    }

    private static void SeedData(ModelBuilder modelBuilder)
    {
        var userId1 = Guid.Parse("11111111-1111-1111-1111-111111111111");
        var userId2 = Guid.Parse("22222222-2222-2222-2222-222222222222");

        var courseId1 = Guid.Parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa");
        var courseId2 = Guid.Parse("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb");

        var topicId1 = Guid.Parse("cccccccc-cccc-cccc-cccc-cccccccccccc");
        var topicId2 = Guid.Parse("dddddddd-dddd-dddd-dddd-dddddddddddd");
        var topicId3 = Guid.Parse("eeeeeeee-eeee-eeee-eeee-eeeeeeeeeeee");

        var resourceId1 = Guid.Parse("ffffffff-ffff-ffff-ffff-ffffffffffff");
        var resourceId2 = Guid.Parse("00000000-0000-0000-aaaa-000000000001");
        var resourceId3 = Guid.Parse("00000000-0000-0000-aaaa-000000000002");

        var now = new DateTime(2025, 1, 1, 0, 0, 0, DateTimeKind.Utc);

        modelBuilder.Entity<User>().HasData(
            new User
            {
                Id = userId1,
                Name = "Alice Dupont",
                Email = "alice@metacourse.io",
                PasswordHash = "$2a$11$EuQ5pngrcHnxS6BhcMo6Mut73tAaJSDYB7K9TxahwJa5wAnJCF2o6",
                CreatedAt = now
            },
            new User
            {
                Id = userId2,
                Name = "Bob Martin",
                Email = "bob@metacourse.io",
                PasswordHash = "$2a$11$4.r72zZul8Pj.QJ5kmVNE.0dRJuAmIefGvZtt9xZ1.fAzztjGKqtS",
                CreatedAt = now
            }
        );

        modelBuilder.Entity<Course>().HasData(
            new Course
            {
                Id = courseId1,
                Title = "Développement Web Moderne avec React",
                Description = "Maîtrisez React, Tailwind CSS et TypeScript pour créer des applications web performantes.",
                Status = CourseStatus.Published,
                CreatorId = userId1,
                CreatedAt = now,
                UpdatedAt = now
            },
            new Course
            {
                Id = courseId2,
                Title = "API REST avec .NET et FastEndpoints",
                Description = "Apprenez à construire des APIs REST robustes avec ASP.NET Core et FastEndpoints.",
                Status = CourseStatus.Draft,
                CreatorId = userId2,
                CreatedAt = now,
                UpdatedAt = now
            }
        );

        modelBuilder.Entity<Topic>().HasData(
            new Topic { Id = topicId1, Title = "Introduction à React", Description = "Les bases de React : composants, JSX, props.", Position = 1, CourseId = courseId1 },
            new Topic { Id = topicId2, Title = "Hooks et State", Description = "useState, useEffect et hooks personnalisés.", Position = 2, CourseId = courseId1 },
            new Topic { Id = topicId3, Title = "Fondamentaux REST", Description = "Principes REST et verbes HTTP.", Position = 1, CourseId = courseId2 }
        );

        modelBuilder.Entity<Resource>().HasData(
            new Resource { Id = resourceId1, Type = ResourceType.Video, Title = "React en 30 minutes", Content = "https://youtube.com/watch?v=example1", CreatedAt = now },
            new Resource { Id = resourceId2, Type = ResourceType.Text, Title = "Guide des Hooks", Content = "Les hooks permettent d'utiliser le state et d'autres fonctionnalités React dans des composants fonctionnels.", CreatedAt = now },
            new Resource { Id = resourceId3, Type = ResourceType.Url, Title = "Documentation officielle React", Content = "https://react.dev", CreatedAt = now }
        );

        modelBuilder.Entity<TopicResource>().HasData(
            new TopicResource { TopicId = topicId1, ResourceId = resourceId1, Position = 1 },
            new TopicResource { TopicId = topicId1, ResourceId = resourceId3, Position = 2 },
            new TopicResource { TopicId = topicId2, ResourceId = resourceId2, Position = 1 }
        );

        modelBuilder.Entity<UserCourse>().HasData(
            new UserCourse { UserId = userId2, CourseId = courseId1, EnrolledAt = now }
        );
    }
}