using FileShare_EFCore.Models;
using Microsoft.EntityFrameworkCore;

namespace FileShare_EFCore.Database
{
    /// <summary>
    /// 应用数据库上下文 —— 继承自 FileShare-EFCore 的 AppDbContext。
    /// 所有业务实体在此注册 DbSet。
    /// 这是 FileShare-API 和 FileShare-PC 共用的具体数据上下文。
    /// </summary>
    public class AppDataContext(DatabaseConfiguration dbConfig) : AppDbContext(dbConfig)
    {
        /// <summary>天气预报数据</summary>
        public DbSet<WeatherForecastEntity> WeatherForecasts => Set<WeatherForecastEntity>();

        /// <summary>用户数据</summary>
        public DbSet<UserEntity> Users => Set<UserEntity>();

        /// <summary>API refresh token 数据</summary>
        public DbSet<ApiRefreshTokenEntity> ApiRefreshTokens => Set<ApiRefreshTokenEntity>();

        /// <summary>文件库根目录数据</summary>
        public DbSet<ManagedLibraryRoot> ManagedLibraryRoots => Set<ManagedLibraryRoot>();

        /// <summary>文件库文件记录数据</summary>
        public DbSet<ManagedFileRecord> ManagedFileRecords => Set<ManagedFileRecord>();

        /// <summary>文件缩略图映射数据</summary>
        public DbSet<ManagedThumbnailMap> ManagedThumbnailMaps => Set<ManagedThumbnailMap>();

        /// <summary>
        /// 配置实体映射，包括主键、索引和属性约束。
        /// </summary>
        /// <param name="modelBuilder">模型构建器。</param>
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            modelBuilder.Entity<WeatherForecastEntity>(entity =>
            {
                entity.HasKey(e => e.Id).HasName("pk-weather-forecast");
                entity.Property(e => e.Summary).HasMaxLength(200);
            });

            modelBuilder.Entity<UserEntity>(entity =>
            {
                entity.HasKey(e => e.Id).HasName("pk-user");
                entity.Property(e => e.Email).HasMaxLength(200);
            });

            modelBuilder.Entity<ApiRefreshTokenEntity>(entity =>
            {
                entity.HasKey(e => e.Id).HasName("pk-api-refresh-token");
                entity.HasIndex(e => e.TokenHash).IsUnique().HasDatabaseName("idx-api-refresh-token-hash");
                entity.HasIndex(e => e.UserId).HasDatabaseName("idx-api-refresh-token-user-id");
            });

            modelBuilder.Entity<ManagedLibraryRoot>(entity =>
            {
                entity.HasKey(e => e.Id).HasName("pk-managed-library-root");
                entity.HasIndex(e => e.Path).IsUnique().HasDatabaseName("idx-managed-library-root-path");
                entity.Property(e => e.Path).HasMaxLength(1024);
                entity.Property(e => e.DisplayName).HasMaxLength(200);
                entity.Property(e => e.LastScanError).HasMaxLength(2000);
                entity.Property(e => e.IsAvailable).HasDefaultValue(true);
            });

            modelBuilder.Entity<ManagedFileRecord>(entity =>
            {
                entity.HasKey(e => e.Id).HasName("pk-managed-file-record");
                entity.HasIndex(e => e.LibraryRootId).HasDatabaseName("idx-managed-file-record-root-id");
                entity.HasIndex(e => e.ThumbnailId).HasDatabaseName("idx-managed-file-record-thumbnail-id");
                entity.HasIndex(e => e.AbsolutePath).IsUnique().HasDatabaseName("idx-managed-file-record-absolute-path");
                entity.HasIndex(e => new { e.MediaType, e.Exists }).HasDatabaseName("idx-managed-file-record-media-type-exists");
                entity.HasIndex(e => e.LastPlayedAt).HasDatabaseName("idx-managed-file-record-last-played-at");
                entity.Property(e => e.FileName).HasMaxLength(260);
                entity.Property(e => e.RelativePath).HasMaxLength(1024);
                entity.Property(e => e.AbsolutePath).HasMaxLength(2048);
                entity.Property(e => e.Extension).HasMaxLength(32);
                entity.Property(e => e.MediaType).HasMaxLength(20);
                entity.Property(e => e.ContentType).HasMaxLength(100);
                entity.HasOne(e => e.LibraryRoot)
                    .WithMany(e => e.Files)
                    .HasForeignKey(e => e.LibraryRootId)
                    .OnDelete(DeleteBehavior.Cascade);
                entity.HasOne(e => e.Thumbnail)
                    .WithMany(e => e.Files)
                    .HasForeignKey(e => e.ThumbnailId)
                    .OnDelete(DeleteBehavior.SetNull);
            });

            modelBuilder.Entity<ManagedThumbnailMap>(entity =>
            {
                entity.HasKey(e => e.Id).HasName("pk-managed-thumbnail-map");
                entity.HasIndex(e => e.LibraryRootId).HasDatabaseName("idx-managed-thumbnail-map-root-id");
                entity.HasIndex(e => e.RelativePath).IsUnique().HasDatabaseName("idx-managed-thumbnail-map-relative-path");
                entity.Property(e => e.RelativePath).HasMaxLength(1024);
                entity.Property(e => e.ContentType).HasMaxLength(100);
                entity.HasOne(e => e.LibraryRoot)
                    .WithMany(e => e.Thumbnails)
                    .HasForeignKey(e => e.LibraryRootId)
                    .OnDelete(DeleteBehavior.Cascade);
            });
        }
    }
}