<?php
declare(strict_types=1);

namespace Tests\Post;

use App\Post\Post;
use App\Post\PostRepository;
use PDO;
use PDOStatement;
use PHPUnit\Framework\MockObject\MockObject;
use PHPUnit\Framework\TestCase;

/**
 * Tests unitaires pour PostRepository.
 *
 * Vérifie que chaque méthode du dépôt construit le bon SQL,
 * lie les bons paramètres et retourne les bonnes valeurs.
 *
 * PDO et PDOStatement sont mockés pour isoler complètement
 * le dépôt de la base de données.
 */
final class PostRepositoryTest extends TestCase
{
    /** @var PDO&MockObject */
    private PDO $db;

    private PostRepository $repository;

    /**
     * Données représentant une ligne article en base de données (avec JOINs).
     *
     * @var array<string, mixed>
     */
    private array $rowPost;

    protected function setUp(): void
    {
        $this->db         = $this->createMock(PDO::class);
        $this->repository = new PostRepository($this->db);

        $this->rowPost = [
            'id'              => 1,
            'title'           => 'Introduction à PHP',
            'content'         => '<p>Contenu de test</p>',
            'slug'            => 'introduction-a-php',
            'author_id'       => 2,
            'author_username' => 'alice',
            'category_id'     => 3,
            'category_name'   => 'PHP',
            'category_slug'   => 'php',
            'created_at'      => '2024-01-01 00:00:00',
            'updated_at'      => '2024-01-02 00:00:00',
        ];
    }

    // ── Helpers ────────────────────────────────────────────────────

    /**
     * Crée un PDOStatement mock préconfiguré pour les requêtes de lecture.
     *
     * @param list<array<string,mixed>> $rows Lignes retournées par fetchAll()
     * @param array<string,mixed>|false $row  Ligne retournée par fetch()
     */
    private function stmtForRead(array $rows = [], array|false $row = false): PDOStatement&MockObject
    {
        $stmt = $this->createMock(PDOStatement::class);
        $stmt->method('execute')->willReturn(true);
        $stmt->method('fetchAll')->willReturn($rows);
        $stmt->method('fetch')->willReturn($row);

        return $stmt;
    }

    /**
     * Crée un PDOStatement mock préconfiguré pour les requêtes d'écriture.
     */
    private function stmtForWrite(int $rowCount = 1): PDOStatement&MockObject
    {
        $stmt = $this->createMock(PDOStatement::class);
        $stmt->method('execute')->willReturn(true);
        $stmt->method('rowCount')->willReturn($rowCount);

        return $stmt;
    }


    // ── findAll ────────────────────────────────────────────────────

    /**
     * findAll() sans filtre utilise query() (pas de paramètre à lier)
     * et retourne un tableau vide si aucun article n'existe.
     */
    public function testFindAllReturnsEmptyArrayWhenNone(): void
    {
        $stmt = $this->stmtForRead([]);
        $this->db->method('query')->willReturn($stmt);

        $this->assertSame([], $this->repository->findAll());
    }

    /**
     * findAll() retourne des instances Post hydratées.
     */
    public function testFindAllReturnsPostInstances(): void
    {
        $stmt = $this->stmtForRead([$this->rowPost]);
        $this->db->method('query')->willReturn($stmt);

        $result = $this->repository->findAll();

        $this->assertCount(1, $result);
        $this->assertInstanceOf(Post::class, $result[0]);
        $this->assertSame('Introduction à PHP', $result[0]->getTitle());
        $this->assertSame('alice', $result[0]->getAuthorUsername());
    }

    /**
     * findAll() sans filtre appelle query() et non prepare()
     * (pas de paramètre à lier).
     */
    public function testFindAllWithoutFilterUsesQueryNotPrepare(): void
    {
        $stmt = $this->stmtForRead([]);
        $this->db->expects($this->once())->method('query')->willReturn($stmt);
        $this->db->expects($this->never())->method('prepare');

        $this->repository->findAll();
    }

    /**
     * findAll() avec categoryId prépare un SQL contenant la clause WHERE category_id
     * et exécute avec le bon paramètre.
     */
    public function testFindAllWithCategoryIdPassesFilterCorrectly(): void
    {
        $stmt = $this->stmtForRead([]);

        $this->db->expects($this->once())
            ->method('prepare')
            ->with($this->stringContains('category_id'))
            ->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with($this->callback(fn (array $p): bool =>
                isset($p[':category_id']) && $p[':category_id'] === 3
            ));

        $this->repository->findAll(3);
    }


    // ── findRecent ─────────────────────────────────────────────────

    /**
     * findRecent() retourne un tableau vide si aucun article n'existe.
     */
    public function testFindRecentReturnsEmptyArray(): void
    {
        $stmt = $this->stmtForRead([]);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertSame([], $this->repository->findRecent(5));
    }

    /**
     * findRecent() lie la limite via bindValue() avec le bon entier.
     */
    public function testFindRecentPassesLimitCorrectly(): void
    {
        $stmt = $this->stmtForRead([]);
        $this->db->method('prepare')->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('bindValue')
            ->with(':limit', 10, PDO::PARAM_INT);

        $this->repository->findRecent(10);
    }

    /**
     * findRecent() retourne des instances Post hydratées.
     */
    public function testFindRecentReturnsPostInstances(): void
    {
        $stmt = $this->stmtForRead([$this->rowPost]);
        $this->db->method('prepare')->willReturn($stmt);

        $result = $this->repository->findRecent(1);

        $this->assertCount(1, $result);
        $this->assertInstanceOf(Post::class, $result[0]);
    }


    // ── findByUserId ───────────────────────────────────────────────

    /**
     * findByUserId() retourne un tableau vide si l'utilisateur n'a aucun article.
     */
    public function testFindByUserIdReturnsEmptyArray(): void
    {
        $stmt = $this->stmtForRead([]);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertSame([], $this->repository->findByUserId(99));
    }

    /**
     * findByUserId() exécute avec le bon author_id.
     */
    public function testFindByUserIdPassesCorrectParameters(): void
    {
        $stmt = $this->stmtForRead([]);
        $this->db->method('prepare')->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with($this->callback(fn (array $p): bool =>
                isset($p[':author_id']) && $p[':author_id'] === 7
            ));

        $this->repository->findByUserId(7);
    }

    /**
     * findByUserId() avec categoryId exécute avec les deux filtres.
     */
    public function testFindByUserIdWithCategoryIdPassesBothFilters(): void
    {
        $stmt = $this->stmtForRead([]);
        $this->db->method('prepare')->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with($this->callback(fn (array $p): bool =>
                isset($p[':author_id'], $p[':category_id'])
                    && $p[':author_id']   === 7
                    && $p[':category_id'] === 3
            ));

        $this->repository->findByUserId(7, 3);
    }


    // ── findBySlug ─────────────────────────────────────────────────

    /**
     * findBySlug() retourne null si le slug est absent.
     */
    public function testFindBySlugReturnsNullWhenMissing(): void
    {
        $stmt = $this->stmtForRead(row: false);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertNull($this->repository->findBySlug('inexistant'));
    }

    /**
     * findBySlug() retourne une instance Post si le slug existe.
     */
    public function testFindBySlugReturnsPostWhenFound(): void
    {
        $stmt = $this->stmtForRead(row: $this->rowPost);
        $this->db->method('prepare')->willReturn($stmt);

        $result = $this->repository->findBySlug('introduction-a-php');

        $this->assertInstanceOf(Post::class, $result);
        $this->assertSame('introduction-a-php', $result->getStoredSlug());
    }

    /**
     * findBySlug() exécute avec le bon slug.
     */
    public function testFindBySlugQueriesWithCorrectSlug(): void
    {
        $stmt = $this->stmtForRead(row: false);
        $this->db->method('prepare')->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with([':slug' => 'mon-article']);

        $this->repository->findBySlug('mon-article');
    }


    // ── findById ───────────────────────────────────────────────────

    /**
     * findById() retourne null si l'article est absent.
     */
    public function testFindByIdReturnsNullWhenMissing(): void
    {
        $stmt = $this->stmtForRead(row: false);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertNull($this->repository->findById(999));
    }

    /**
     * findById() retourne une instance Post si l'article existe.
     */
    public function testFindByIdReturnsPostWhenFound(): void
    {
        $stmt = $this->stmtForRead(row: $this->rowPost);
        $this->db->method('prepare')->willReturn($stmt);

        $result = $this->repository->findById(1);

        $this->assertInstanceOf(Post::class, $result);
        $this->assertSame(1, $result->getId());
    }

    /**
     * findById() exécute avec le bon identifiant.
     */
    public function testFindByIdQueriesWithCorrectId(): void
    {
        $stmt = $this->stmtForRead(row: false);
        $this->db->method('prepare')->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with([':id' => 12]);

        $this->repository->findById(12);
    }


    // ── create ─────────────────────────────────────────────────────

    /**
     * create() prépare un INSERT avec les bonnes colonnes.
     */
    public function testCreateCallsInsertWithCorrectData(): void
    {
        $post = Post::fromArray($this->rowPost);
        $stmt = $this->stmtForWrite();

        $this->db->method('prepare')
            ->with($this->stringContains('INSERT INTO posts'))
            ->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with($this->callback(function (array $data) use ($post): bool {
                return $data[':title']       === $post->getTitle()
                    && $data[':content']     === $post->getContent()
                    && $data[':slug']        === 'introduction-a-php'
                    && $data[':author_id']   === 5
                    && $data[':category_id'] === 3
                    && isset($data[':created_at'], $data[':updated_at']);
            }));

        $this->db->method('lastInsertId')->willReturn('1');

        $this->repository->create($post, 'introduction-a-php', 5, 3);
    }

    /**
     * create() retourne l'identifiant généré par la base de données.
     */
    public function testCreateReturnsGeneratedId(): void
    {
        $post = Post::fromArray($this->rowPost);
        $stmt = $this->stmtForWrite();
        $this->db->method('prepare')->willReturn($stmt);
        $this->db->method('lastInsertId')->willReturn('42');

        $this->assertSame(42, $this->repository->create($post, 'slug', 1, null));
    }

    /**
     * create() accepte un categoryId null (article sans catégorie).
     */
    public function testCreateAcceptsCategoryIdNull(): void
    {
        $post = Post::fromArray($this->rowPost);
        $stmt = $this->stmtForWrite();
        $this->db->method('prepare')->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with($this->callback(fn (array $data): bool =>
                array_key_exists(':category_id', $data) && $data[':category_id'] === null
            ));

        $this->db->method('lastInsertId')->willReturn('1');

        $this->repository->create($post, 'slug', 1, null);
    }


    // ── update ─────────────────────────────────────────────────────

    /**
     * update() prépare un UPDATE avec les bonnes colonnes et le bon identifiant.
     */
    public function testUpdateCallsUpdateWithCorrectData(): void
    {
        $post = Post::fromArray($this->rowPost);
        $stmt = $this->stmtForWrite(1);

        $this->db->method('prepare')
            ->with($this->stringContains('UPDATE posts'))
            ->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with($this->callback(function (array $data) use ($post): bool {
                return $data[':title']       === $post->getTitle()
                    && $data[':content']     === $post->getContent()
                    && $data[':slug']        === 'nouveau-slug'
                    && $data[':category_id'] === 3
                    && $data[':id']          === 1
                    && isset($data[':updated_at']);
            }));

        $this->repository->update(1, $post, 'nouveau-slug', 3);
    }

    /**
     * update() retourne le nombre de lignes affectées.
     */
    public function testUpdateReturnsAffectedRowCount(): void
    {
        $post = Post::fromArray($this->rowPost);
        $stmt = $this->stmtForWrite(1);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertSame(1, $this->repository->update(1, $post, 'slug', null));
    }

    /**
     * update() retourne 0 si aucune ligne n'est modifiée (article supprimé entre-temps).
     */
    public function testUpdateReturnsZeroWhenNoRowAffected(): void
    {
        $post = Post::fromArray($this->rowPost);
        $stmt = $this->stmtForWrite(0);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertSame(0, $this->repository->update(1, $post, 'slug', null));
    }


    // ── delete ─────────────────────────────────────────────────────

    /**
     * delete() prépare un DELETE avec le bon identifiant.
     */
    public function testDeleteCallsDeleteWithCorrectId(): void
    {
        $stmt = $this->stmtForWrite(1);

        $this->db->expects($this->once())
            ->method('prepare')
            ->with($this->stringContains('DELETE FROM posts'))
            ->willReturn($stmt);

        $stmt->expects($this->once())
            ->method('execute')
            ->with([':id' => 6]);

        $this->repository->delete(6);
    }

    /**
     * delete() retourne le nombre de lignes supprimées.
     */
    public function testDeleteReturnsDeletedRowCount(): void
    {
        $stmt = $this->stmtForWrite(1);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertSame(1, $this->repository->delete(6));
    }

    /**
     * delete() retourne 0 si l'article n'existait plus.
     */
    public function testDeleteReturnsZeroWhenNotFound(): void
    {
        $stmt = $this->stmtForWrite(0);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertSame(0, $this->repository->delete(99));
    }


    // ── slugExists ─────────────────────────────────────────────────

    /**
     * slugExists() retourne false si le slug n'existe pas en base.
     */
    public function testSlugExistsReturnsFalseWhenMissing(): void
    {
        $stmt = $this->createMock(PDOStatement::class);
        $stmt->method('execute')->willReturn(true);
        $stmt->method('fetchColumn')->willReturn(false);
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertFalse($this->repository->slugExists('slug-libre'));
    }

    /**
     * slugExists() retourne true si le slug est pris par un autre article.
     */
    public function testSlugExistsReturnsTrueWhenTaken(): void
    {
        $stmt = $this->createMock(PDOStatement::class);
        $stmt->method('execute')->willReturn(true);
        $stmt->method('fetchColumn')->willReturn('1');
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertTrue($this->repository->slugExists('slug-pris'));
    }

    /**
     * slugExists() retourne false si le slug appartient à l'article exclu (mise à jour).
     */
    public function testSlugExistsReturnsFalseForExcludedPost(): void
    {
        $stmt = $this->createMock(PDOStatement::class);
        $stmt->method('execute')->willReturn(true);
        $stmt->method('fetchColumn')->willReturn('5');
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertFalse($this->repository->slugExists('mon-slug', 5));
    }

    /**
     * slugExists() retourne true si le slug appartient à un article différent de l'exclu.
     */
    public function testSlugExistsReturnsTrueForOtherPost(): void
    {
        $stmt = $this->createMock(PDOStatement::class);
        $stmt->method('execute')->willReturn(true);
        $stmt->method('fetchColumn')->willReturn('3');
        $this->db->method('prepare')->willReturn($stmt);

        $this->assertTrue($this->repository->slugExists('mon-slug', 5));
    }
}