<?php

declare(strict_types=1);

namespace Tests\Feature;

use Illuminate\Database\Migrations\Migration;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Tests\TestCase;

class DropUsersMigrationTest extends TestCase
{
    use RefreshDatabase;

    // Each require returns a fresh anonymous-class instance; there is no name to collide.
    private function migration(): Migration
    {
        return require __DIR__.'/../../database/migrations/2026_08_15_000004_drop_users_and_sessions.php';
    }

    public function test_the_migrated_schema_has_no_user_tables(): void
    {
        $this->assertFalse(Schema::hasTable('users'));
        $this->assertFalse(Schema::hasTable('sessions'));
        $this->assertFalse(Schema::hasTable('password_reset_tokens'));
        $this->assertFalse(Schema::hasColumn('trackers', 'user_id'));
    }

    public function test_down_restores_the_tables_and_column(): void
    {
        $this->migration()->down();

        $this->assertTrue(Schema::hasTable('users'));
        $this->assertTrue(Schema::hasTable('sessions'));
        $this->assertTrue(Schema::hasTable('password_reset_tokens'));
        $this->assertTrue(Schema::hasColumn('trackers', 'user_id'));
    }

    public function test_restored_user_id_is_nullable_so_existing_trackers_survive(): void
    {
        DB::table('trackers')->insert([
            'label' => 'Counter',
            'unit' => 'units',
            'count' => 3,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        $this->migration()->down();

        $nullable = DB::selectOne(
            'select is_nullable from information_schema.columns
             where table_schema = database() and table_name = ? and column_name = ?',
            ['trackers', 'user_id']
        );

        $this->assertSame('YES', $nullable->is_nullable ?? $nullable->IS_NULLABLE);
    }

    public function test_up_drops_them_again_respecting_foreign_keys(): void
    {
        $this->migration()->down();
        $this->migration()->up();

        $this->assertFalse(Schema::hasTable('users'));
        $this->assertFalse(Schema::hasColumn('trackers', 'user_id'));
    }

    public function test_the_counter_survives_the_round_trip(): void
    {
        $trackerId = DB::table('trackers')->insertGetId([
            'label' => 'Counter',
            'unit' => 'units',
            'count' => 77,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        $this->migration()->down();
        $this->migration()->up();

        $this->assertSame(77, (int) DB::table('trackers')->where('id', $trackerId)->value('count'));
    }
}