using Microsoft.EntityFrameworkCore;

namespace MangaReader.Core.Data;

public class MangaContext(DbContextOptions options) : DbContext(options)
{
    public DbSet<Manga> Mangas { get; set; }
    public DbSet<MangaCover> MangaCovers { get; set; }
    public DbSet<MangaTitle> MangaTitles { get; set; }
    public DbSet<MangaDescription> MangaDescriptions { get; set; }
    public DbSet<Source> Sources { get; set; }
    public DbSet<MangaSource> MangaSources { get; set; }
    public DbSet<Contributor> Contributors { get; set; }
    public DbSet<MangaContributor> MangaContributors { get; set; }
    public DbSet<Genre> Genres { get; set; }
    public DbSet<MangaGenre> MangaGenres { get; set; }
    //public DbSet<MangaChapter> MangaChapters { get; set; }
    //public DbSet<ChapterSource> ChapterSources { get; set; }
    //public DbSet<ChapterPage> ChapterPages { get; set; }

    public DbSet<SourceTitle> SourceTitles { get; set; }
    public DbSet<SourceDescription> SourceDescriptions { get; set; }
    public DbSet<SourceCover> SourceCovers { get; set; }
    public DbSet<SourceChapter> SourceChapters { get; set; }
    public DbSet<SourcePage> SourcePages { get; set; }

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

        ConfigureManga(modelBuilder);
        ConfigureMangaCover(modelBuilder);
        ConfigureMangaTitle(modelBuilder);
        ConfigureMangaDescription(modelBuilder);
        ConfigureSource(modelBuilder);
        ConfigureMangaSource(modelBuilder);
        ConfigureContributor(modelBuilder);
        ConfigureMangaContributor(modelBuilder);
        ConfigureGenre(modelBuilder);
        ConfigureMangaGenre(modelBuilder);
        //ConfigureMangaChapter(modelBuilder);
        //ConfigureChapterSource(modelBuilder);
        //ConfigureChapterPage(modelBuilder);
        ConfigureSourceTitle(modelBuilder);
        ConfigureSourceDescription(modelBuilder);
        ConfigureMangaSourceCover(modelBuilder);
        ConfigureMangaSourceChapter(modelBuilder);
        ConfigureSourcePage(modelBuilder);
    }

    private static void ConfigureManga(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<Manga>()
            .HasKey(x => x.MangaId);

        //modelBuilder.Entity<Manga>()
        //    .HasIndex(x => x.Title)
        //    .IsUnique();

        modelBuilder.Entity<Manga>()
            .HasIndex(x => x.Slug)
            .IsUnique();
    }

    private static void ConfigureMangaCover(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<MangaCover>()
            .HasKey(x => x.MangaCoverId);

        modelBuilder
            .Entity<MangaCover>()
            .HasOne(x => x.Manga)
            .WithMany(x => x.Covers)
            .HasForeignKey(x => x.MangaId)
            .OnDelete(DeleteBehavior.Cascade);

        modelBuilder.Entity<MangaCover>()
            .HasIndex(x => x.Guid)
            .IsUnique();

        //modelBuilder
        //    .Entity<MangaCover>()
        //    .HasIndex(x => new { x.MangaId, x.IsPrimary })
        //    .IsUnique()
        //    .HasFilter("[IsPrimary] = 1"); // Enforce only one primary cover per manga
    }

    private static void ConfigureMangaTitle(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<MangaTitle>()
            .HasKey(mangaTitle => mangaTitle.MangaTitleId);

        modelBuilder.Entity<MangaTitle>()
            .Property(mt => mt.Name)
            .IsRequired();

        modelBuilder.Entity<MangaTitle>()
            .Property(mt => mt.Language)
            .IsRequired();

        modelBuilder.Entity<MangaTitle>()
            .HasIndex(mangaTitle => new { mangaTitle.MangaId, mangaTitle.Name, mangaTitle.Language })
            .IsUnique();

        modelBuilder
            .Entity<MangaTitle>()
            .HasIndex(mangaTitle => mangaTitle.Name);

        modelBuilder
            .Entity<MangaTitle>()
            .HasOne(x => x.Manga)
            .WithMany(x => x.Titles)
            .HasForeignKey(x => x.MangaId)
            .OnDelete(DeleteBehavior.Cascade);
    }

    private static void ConfigureMangaDescription(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<MangaDescription>()
            .HasKey(mangaDescription => mangaDescription.MangaDescriptionId);

        modelBuilder.Entity<MangaDescription>()
            .Property(mangaDescription => mangaDescription.Text)
            .IsRequired();

        modelBuilder.Entity<MangaDescription>()
            .Property(mangaDescription => mangaDescription.Language)
            .IsRequired();

        modelBuilder.Entity<MangaDescription>()
            .HasIndex(mangaDescription => new { mangaDescription.MangaId, mangaDescription.Text, mangaDescription.Language })
            .IsUnique();

        modelBuilder
            .Entity<MangaDescription>()
            .HasIndex(mangaDescription => mangaDescription.Text);

        modelBuilder
            .Entity<MangaDescription>()
            .HasOne(x => x.Manga)
            .WithMany(x => x.Descriptions)
            .HasForeignKey(x => x.MangaId)
            .OnDelete(DeleteBehavior.Cascade);
    }

    private static void ConfigureSource(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<Source>()
            .HasKey(x => x.SourceId);

        modelBuilder
            .Entity<Source>()
            .HasIndex(x => x.Name)
            .IsUnique(true);
    }

    private static void ConfigureMangaSource(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<MangaSource>()
            .HasKey(mangaSource => mangaSource.MangaSourceId);

        //modelBuilder
        //    .Entity<MangaSource>()
        //    .HasKey(mangaSource => new { mangaSource.MangaId, mangaSource.SourceId });

        modelBuilder.Entity<MangaSource>()
            .HasIndex(x => x.Url)
            .IsUnique();

        modelBuilder
            .Entity<MangaSource>()
            .HasOne(x => x.Manga)
            .WithMany(x => x.Sources)
            .HasForeignKey(x => x.MangaId)
            .OnDelete(DeleteBehavior.Cascade);
    }

    private static void ConfigureContributor(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<Contributor>()
            .HasKey(x => x.ContributorId);

        modelBuilder
            .Entity<Contributor>()
            .HasIndex(x => x.Name)
            .IsUnique(true);
    }

    private static void ConfigureMangaContributor(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<MangaContributor>()
            .HasKey(mc => new { mc.MangaId, mc.ContributorId, mc.Role });

        modelBuilder
            .Entity<MangaContributor>()
            .HasOne(x => x.Manga)
            .WithMany(x => x.Contributors)
            .HasForeignKey(x => x.MangaId)
            .OnDelete(DeleteBehavior.Cascade);
    }

    private static void ConfigureGenre(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<Genre>()
            .HasKey(x => x.GenreId);

        modelBuilder
            .Entity<Genre>()
            .HasIndex(x => x.Name)
            .IsUnique(true);
    }

    private static void ConfigureMangaGenre(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<MangaGenre>()
            .HasKey(mangaGenre => new { mangaGenre.MangaId, mangaGenre.GenreId });

        modelBuilder
            .Entity<MangaGenre>()
            .HasOne(x => x.Manga)
            .WithMany(x => x.Genres)
            .HasForeignKey(x => x.MangaId)
            .OnDelete(DeleteBehavior.Cascade);
    }

    //private static void ConfigureMangaChapter(ModelBuilder modelBuilder)
    //{
    //    modelBuilder
    //        .Entity<MangaChapter>()
    //        .HasKey(x => x.MangaChapterId);

    //    modelBuilder
    //        .Entity<MangaChapter>()
    //        .HasOne(x => x.Manga)
    //        .WithMany(x => x.Chapters)
    //        .HasForeignKey(x => x.MangaId)
    //        .OnDelete(DeleteBehavior.Cascade);
    //}

    //private static void ConfigureChapterSource(ModelBuilder modelBuilder)
    //{
    //    modelBuilder
    //        .Entity<ChapterSource>()
    //        .HasKey(chapterSource => new { chapterSource.MangaChapterId, chapterSource.SourceId });

    //    modelBuilder
    //        .Entity<ChapterSource>()
    //        .HasOne(x => x.Chapter)
    //        .WithMany(x => x.Sources)
    //        .HasForeignKey(x => x.MangaChapterId)
    //        .OnDelete(DeleteBehavior.Cascade);
    //}

    //private static void ConfigureChapterPage(ModelBuilder modelBuilder)
    //{
    //    modelBuilder
    //        .Entity<ChapterPage>()
    //        .HasKey(chapterPage => chapterPage.ChapterPageId);

    //    modelBuilder
    //        .Entity<ChapterPage>()
    //        .HasIndex(chapterPage => new { chapterPage.MangaChapterId, chapterPage.PageNumber })
    //        .IsUnique(true);

    //    modelBuilder
    //        .Entity<ChapterPage>()
    //        .HasOne(x => x.MangaChapter)
    //        .WithMany(x => x.Pages)
    //        .HasForeignKey(x => x.MangaChapterId)
    //        .OnDelete(DeleteBehavior.Cascade);
    //}

    private static void ConfigureSourceTitle(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<SourceTitle>()
            .HasKey(x => x.SourceTitleId);

        modelBuilder
           .Entity<SourceTitle>()
           .Property(x => x.Name)
           .IsRequired()
           .HasMaxLength(512);

        // Avoid duplicate rows coming from the same source record
        modelBuilder
            .Entity<SourceTitle>()
            .HasIndex(x => new { x.MangaSourceId, x.Language, x.Name })
            .IsUnique();

        modelBuilder
           .Entity<SourceTitle>()
           .HasOne(x => x.MangaSource)
           .WithMany(x => x.Titles)
           .HasForeignKey(x => x.MangaSourceId)
           .OnDelete(DeleteBehavior.Cascade);
    }

    private static void ConfigureSourceDescription(ModelBuilder modelBuilder)
    {
        modelBuilder
           .Entity<SourceDescription>()
           .HasKey(x => x.SourceDescriptionId);

        modelBuilder
           .Entity<SourceDescription>()
           .Property(x => x.Text)
           .IsRequired();

        // If sources can emit multiple descriptions per language, keep it non-unique.
        // If not, uncomment:
        //modelBuilder
        //    .Entity<SourceDescription>()
        //    .HasIndex(x => new { x.MangaSourceId, x.Language })
        //    .IsUnique();

        modelBuilder
          .Entity<SourceDescription>()
          .HasOne(x => x.MangaSource)
          .WithMany(x => x.Descriptions)
          .HasForeignKey(x => x.MangaSourceId)
          .OnDelete(DeleteBehavior.Cascade);
    }

    private static void ConfigureMangaSourceCover(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<SourceCover>()
            .HasKey(sourceCover => sourceCover.SourceCoverId);

        modelBuilder
            .Entity<SourceCover>()
            .Property(x => x.Url)
            .IsRequired()
            .HasMaxLength(2048);

        modelBuilder
            .Entity<SourceCover>()
            .HasIndex(sourceCover => new { sourceCover.MangaSourceId, sourceCover.Url })
            .IsUnique(true);

        modelBuilder
            .Entity<SourceCover>()
            .HasOne(x => x.MangaSource)
            .WithMany(x => x.Covers)
            .HasForeignKey(x => x.MangaSourceId)
            .OnDelete(DeleteBehavior.Cascade);

        modelBuilder
           .Entity<SourceCover>()
           .HasOne(x => x.MangaCover)
           .WithMany() // or .WithMany(c => c.SourceCovers) if you add a collection nav on MangaCover
           .HasForeignKey(x => x.MangaCoverId)
           .OnDelete(DeleteBehavior.SetNull);

        // Helpful for lookups when you dedupe/file-link after download
        modelBuilder
          .Entity<SourceCover>()
          .HasIndex(x => x.MangaCoverId);
    }

    private static void ConfigureMangaSourceChapter(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<SourceChapter>()
            .HasKey(sourceChapter => sourceChapter.SourceChapterId);

        modelBuilder
            .Entity<SourceChapter>()
            .HasIndex(sourceChapter => new { sourceChapter.MangaSourceId, sourceChapter.ChapterNumber, sourceChapter.Url })
            .IsUnique(true);

        modelBuilder
            .Entity<SourceChapter>()
            .HasOne(x => x.MangaSource)
            .WithMany(x => x.Chapters)
            .HasForeignKey(x => x.MangaSourceId)
            .OnDelete(DeleteBehavior.Cascade);
    }

    private static void ConfigureSourcePage(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<SourcePage>()
            .HasKey(sourcePage => sourcePage.SourcePageId);

        modelBuilder
            .Entity<SourcePage>()
            .HasIndex(sourcePage => new { sourcePage.SourceChapterId, sourcePage.PageNumber })
            .IsUnique(true);

        modelBuilder
            .Entity<SourcePage>()
            .HasOne(x => x.Chapter)
            .WithMany(x => x.Pages)
            .HasForeignKey(x => x.SourceChapterId)
            .OnDelete(DeleteBehavior.Cascade);
    }
}