<?php

namespace Tests\Integration;

use PHPUnit\Framework\Attributes\Group;
use PHPUnit\Framework\Attributes\Test;
use Libs\Model;
use Tests\Models\User;
use Tests\TestCase;

/**
 * ModelFilterTest - DuckBrain integration matrix
 *
 * Family: select, from, where, and, or, whereIn, whereNotIn, whereNull,
 * whereNotNull, whereExists, whereNotExists, limit, orderBy, count, plus
 * resetQuery/buildQuery observed through behavior (state must not leak
 * between executed queries).
 */
#[Group('integration')]
final class ModelFilterTest extends TestCase
{
    /** @var list<int> ids of alice, bob, carol, dave */
    private static array $ids = [];

    public static function setUpBeforeClass(): void
    {
        self::createTable('users', [
            'id'         => 'pk',
            'username'   => 'string',
            'email'      => 'string',
            'bio'        => 'text',
            'age'        => 'number',
            'is_active'  => 'bool',
            'last_login' => 'timestamp',
        ]);
        self::createTable('posts', [
            'id'      => 'pk',
            'user_id' => 'number',
            'title'   => 'string',
            'content' => 'text',
            'rating'  => 'number',
        ]);

        $rows = [
            ['alice', 'alice@duckbrain.dev', 'first', 20, true],
            ['bob', 'bob@duckbrain.dev', 'second', 30, true],
            ['carol', null, 'third', 40, false],
            ['dave', 'dave@duckbrain.dev', null, 50, true],
        ];

        foreach ($rows as [$username, $email, $bio, $age, $active]) {
            $user = new User();
            $user->username = $username;
            $user->email    = $email;
            $user->bio      = $bio;
            $user->age      = $age;
            $user->isActive = $active;
            $user->save();
            self::$ids[] = (int) $user->id;
        }

        // A post owned by alice only, for the EXISTS tests.
        $post = new \Tests\Models\Post();
        $post->userId  = self::$ids[0];
        $post->title   = 'hello world';
        $post->content = 'body';
        $post->rating  = 4.5;
        $post->save();
    }

    /** @return list<int> */
    private static function sortedIds(array $instances): array
    {
        $ids = array_map(static fn (Model $m): int => (int) $m->id, $instances);
        sort($ids);

        return $ids;
    }

    #[Test]

    public function whereEqualityAndOperatorForms(): void
    {
        $this->assertSame(
            [self::$ids[1]],
            self::sortedIds(User::where('username', 'bob')->get())
        );
        $this->assertSame(
            [self::$ids[2], self::$ids[3]],
            self::sortedIds(User::where('age', '>', '35')->get())
        );
    }

    #[Test]

    public function andNestsConditions(): void
    {
        $this->assertSame(
            [self::$ids[3]],
            self::sortedIds(User::where('age', '>', '25')->and('username', 'dave')->get())
        );
    }

    #[Test]

    public function orCombinesAlternativeConditions(): void
    {
        $this->assertSame(
            [self::$ids[0], self::$ids[3]],
            self::sortedIds(User::where('username', 'alice')->or('username', 'dave')->get())
        );
    }

    #[Test]

    public function whereInAndWhereNotIn(): void
    {
        $in = self::sortedIds(User::whereIn('username', ['alice', 'carol'])->get());
        $this->assertSame([self::$ids[0], self::$ids[2]], $in);

        $notIn = self::sortedIds(User::whereNotIn('username', ['alice', 'carol'])->get());
        $this->assertSame([self::$ids[1], self::$ids[3]], $notIn);
    }

    #[Test]

    public function whereNullAndWhereNotNull(): void
    {
        $this->assertSame(
            [self::$ids[3]],
            self::sortedIds(User::whereNull('bio')->get())
        );
        $this->assertSame(
            [self::$ids[2]],
            self::sortedIds(User::whereNull('email')->get())
        );
        $this->assertCount(3, User::whereNotNull('email')->get());
    }

    #[Test]

    public function whereExistsAndWhereNotExists(): void
    {
        $correlated = 'SELECT 1 FROM posts WHERE posts.user_id = users.id';

        $this->assertSame(
            [self::$ids[0]],
            self::sortedIds(User::whereExists($correlated)->get())
        );
        $this->assertSame(
            [self::$ids[1], self::$ids[2], self::$ids[3]],
            self::sortedIds(User::whereNotExists($correlated)->get())
        );
    }

    #[Test]

    public function selectAndFromRestrictTheProjection(): void
    {
        $rows = User::select('username')->from('users')->where('username', 'bob')->get();

        $this->assertCount(1, $rows);
        $this->assertSame('bob', $rows[0]->username);
    }

    #[Test]

    public function limitSingleAndOffsetForms(): void
    {
        $firstTwo = User::orderBy('id', 'ASC')->limit(2)->get();
        $this->assertSame(
            [self::$ids[0], self::$ids[1]],
            array_map(static fn (Model $m): int => (int) $m->id, $firstTwo)
        );

        // limit(offset, quantity) -> skip the first two.
        $lastTwo = User::orderBy('id', 'ASC')->limit(2, 2)->get();
        $this->assertSame(
            [self::$ids[2], self::$ids[3]],
            array_map(static fn (Model $m): int => (int) $m->id, $lastTwo)
        );
    }

    #[Test]

    public function orderByColumnAscendingAndDescending(): void
    {
        $asc = array_map(static fn (Model $m): string => (string) $m->age, User::orderBy('age', 'ASC')->get());
        $this->assertSame(['20', '30', '40', '50'], array_map('strval', array_map('intval', $asc)));

        $descFirst = User::orderBy('age', 'DESC')->getFirst();
        $this->assertSame('dave', $descFirst->username);
    }

    #[Test]

    public function countWithAndWithoutConditions(): void
    {
        $this->assertSame(4, User::count());
        $this->assertSame(3, User::where('age', '>', '25')->count());
    }

    #[Test]

    public function countWithUseLimit(): void
    {
        $this->assertSame(2, User::orderBy('id', 'ASC')->limit(2)->count(true, true));
    }

    #[Test]

    public function countWithoutResetKeepsTheOriginalQuery(): void
    {
        User::where('age', '>', '25');
        $count = User::count(false);

        $this->assertSame(3, $count);
        $this->assertSame(
            [self::$ids[1], self::$ids[2], self::$ids[3]],
            self::sortedIds(User::get()),
            'count(false) must leave the where active; get() consumes it'
        );
    }

    #[Test]

    public function queryStateResetsAfterExecution(): void
    {
        $one = User::where('id', self::$ids[0])->getFirst();
        $this->assertSame('alice', $one->username);

        $this->assertCount(4, User::all(), 'where must not leak into the next query');
        $this->assertCount(4, User::get());
    }

    #[Test]

    public function orderByRandReturnsEveryRow(): void
    {
        // The readme matrix promises orderBy ok on the three engines.
        // Model emits literal RAND(); sqlite and PostgreSQL know RANDOM().
        // This test documents the promise; failures are findings, not noise.
        $this->assertCount(4, User::orderBy('RAND')->get());
    }
}