<?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('ad_metrics', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->bigInteger('ad_campaign_id')->unsigned();
            $table->string('platform', 20);
            $table->date('date');
            $table->bigInteger('impressions')->default(0);
            $table->bigInteger('clicks')->default(0);
            $table->decimal('spend', 12, 2)->default(0);
            $table->integer('conversions')->default(0);
            $table->decimal('ctr', 8, 4)->default(0);     // click-through rate %
            $table->decimal('cpc', 8, 2)->default(0);      // cost per click
            $table->decimal('cpm', 8, 2)->default(0);      // cost per 1000 impressions
            $table->decimal('roas', 8, 2)->default(0);     // return on ad spend
            $table->json('custom')->nullable();
            $table->timestamps();

            $table->foreign('ad_campaign_id')->references('id')->on('ad_campaigns')->onDelete('cascade');
            $table->unique(['ad_campaign_id', 'platform', 'date'], 'uniq_metric_campaign_platform_date');
        });
    }

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