DRS9.Dashboard/src/DRS9.Dashboard.Infrastructure/Data/DashboardDbContext.cs

using DRS9.Dashboard.Domain.Entities;
using Microsoft.EntityFrameworkCore;

namespace DRS9.Dashboard.Infrastructure.Data;

public class DashboardDbContext : DbContext
{
    public DashboardDbContext(DbContextOptions<DashboardDbContext> options) : base(options)
    {
    }

    public DbSet<Device> Devices { get; set; }
    public DbSet<DeviceGroup> DeviceGroups { get; set; }
    public DbSet<Application> Applications { get; set; }
    public DbSet<DeviceAssignment> DeviceAssignments { get; set; }
    public DbSet<User> Users { get; set; }
    public DbSet<AuditLog> AuditLogs { get; set; }
    public DbSet<Playlist> Playlists { get; set; }
    public DbSet<PlaylistItem> PlaylistItems { get; set; }
    public DbSet<AppVersion> AppVersions { get; set; }
    public DbSet<RotatorItem> RotatorItems { get; set; }

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

        // DeviceGroup 配置
        modelBuilder.Entity<DeviceGroup>(entity =>
        {
            entity.HasIndex(e => e.Name).IsUnique();
        });

        // Device 配置
        modelBuilder.Entity<Device>(entity =>
        {
            entity.HasIndex(e => e.DeviceCode).IsUnique();
            entity.HasOne(e => e.DeviceGroup)
                .WithMany(g => g.Devices)
                .HasForeignKey(e => e.DeviceGroupId)
                .OnDelete(DeleteBehavior.SetNull);
        });

        // Application 配置
        modelBuilder.Entity<Application>(entity =>
        {
            entity.HasIndex(e => e.Name);
        });

        // DeviceAssignment 配置（多对多关系的中间表）
        modelBuilder.Entity<DeviceAssignment>(entity =>
        {
            entity.HasOne(e => e.Device)
                .WithMany(d => d.Assignments)
                .HasForeignKey(e => e.DeviceId)
                .OnDelete(DeleteBehavior.Cascade);

            entity.HasOne(e => e.Application)
                .WithMany(a => a.Assignments)
                .HasForeignKey(e => e.ApplicationId)
                .OnDelete(DeleteBehavior.Cascade);

            // 确保同一设备的同一应用只有一个分配
            entity.HasIndex(e => new { e.DeviceId, e.ApplicationId }).IsUnique();
        });

        // User 配置
        modelBuilder.Entity<User>(entity =>
        {
            entity.HasIndex(e => e.Username).IsUnique();
            entity.HasIndex(e => e.Email).IsUnique();
        });

        // Playlist 配置
        modelBuilder.Entity<Playlist>(entity =>
        {
            entity.HasIndex(e => e.Name);
            entity.HasOne(e => e.DeviceGroup)
                .WithMany()
                .HasForeignKey(e => e.DeviceGroupId)
                .OnDelete(DeleteBehavior.SetNull);
        });

        // PlaylistItem 配置
        modelBuilder.Entity<PlaylistItem>(entity =>
        {
            entity.HasOne(e => e.Playlist)
                .WithMany(p => p.Items)
                .HasForeignKey(e => e.PlaylistId)
                .OnDelete(DeleteBehavior.Cascade);

            entity.HasOne(e => e.Application)
                .WithMany()
                .HasForeignKey(e => e.ApplicationId)
                .OnDelete(DeleteBehavior.Cascade);

            // 同一播放列表中的项目按 Order 排序
            entity.HasIndex(e => new { e.PlaylistId, e.Order });
        });

        // AppVersion 配置
        modelBuilder.Entity<AppVersion>(entity =>
        {
            entity.HasIndex(e => new { e.Platform, e.Version });
        });

        // RotatorItem 配置
        modelBuilder.Entity<RotatorItem>(entity =>
        {
            entity.HasKey(e => e.Id);

            // 不配置关系，只配置索引，避免 EF Core 创建影子属性
            // 外键约束在迁移中已定义，这里不再重复配置

            // 同一应用中的轮播项按 Order 排序
            entity.HasIndex(e => new { e.ApplicationId, e.Order });
        });
    }
}