<?php

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

/**
 * Maintenance windows: create once, assign to many hosts. Active/completed are
 * DERIVED from state + starts_at/ends_at + now — never persisted as status.
 */
return new class extends Migration
{
    public function up(): void
    {
        Schema::create('maintenance_windows', function (Blueprint $table) {
            $table->id();
            $table->uuid('uuid')->unique();
            $table->string('title');
            $table->text('public_description')->nullable();
            $table->text('internal_notes')->nullable();
            $table->timestamp('starts_at');
            $table->timestamp('ends_at');
            $table->string('state')->default('draft'); // draft | scheduled | cancelled
            $table->foreignId('created_by')->nullable()->constrained('users')->nullOnDelete();
            $table->timestamp('published_at')->nullable();
            $table->timestamp('cancelled_at')->nullable();
            $table->string('cancellation_reason')->nullable();
            $table->timestamps();
        });

        Schema::create('host_maintenance_window', function (Blueprint $table) {
            $table->id();
            $table->foreignId('host_id')->constrained()->cascadeOnDelete();
            $table->foreignId('maintenance_window_id')->constrained()->cascadeOnDelete();
            $table->unique(['host_id', 'maintenance_window_id']);
        });

        // Idempotent notification ledger — one row per (window, customer, event).
        Schema::create('maintenance_notifications', function (Blueprint $table) {
            $table->id();
            $table->foreignId('maintenance_window_id')->constrained()->cascadeOnDelete();
            $table->foreignId('customer_id')->constrained()->cascadeOnDelete();
            $table->string('event'); // announcement | cancelled
            $table->string('email');
            $table->timestamp('sent_at')->nullable();
            $table->timestamps();
            $table->unique(['maintenance_window_id', 'customer_id', 'event'], 'mw_notif_unique');
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('maintenance_notifications');
        Schema::dropIfExists('host_maintenance_window');
        Schema::dropIfExists('maintenance_windows');
    }
};