<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('banners', function (Blueprint $table) {
            $table->id();
            $table->string('type', 16)->comment('course=课程 activity=活动 custom=自定义');
            $table->unsignedBigInteger('course_id')->nullable();
            $table->unsignedBigInteger('activity_id')->nullable();
            $table->string('title', 255)->nullable()->comment('自定义标题');
            $table->string('cover_url', 512)->nullable()->comment('自定义封面图 URL');
            $table->longText('content_html')->nullable()->comment('自定义富文本内容');
            $table->unsignedInteger('sort')->default(0);
            $table->unsignedTinyInteger('status')->default(1)->comment('1=启用 0=停用');
            $table->timestamps();
            $table->softDeletes();

            $table->foreign('course_id')->references('id')->on('courses')->nullOnDelete();
            $table->foreign('activity_id')->references('id')->on('activities')->nullOnDelete();
            $table->index(['type', 'status', 'sort']);
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('banners');
    }
};