<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Media;

use Brain\Monkey\Functions;
use LIT\MCP\Abilities\WriteFailed;
use LIT\MCP\ChangeLog\ChangeLog;
use LIT\MCP\Integrations\Media\MediaUpdateAbility;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use RuntimeException;
use WP_Error;
use WP_Post;

final class MediaUpdateAbilityTest extends TestCase
{
    /** @var list<array<string, mixed>> */
    private array $postUpdates = [];

    /** @var list<array{int, string}> */
    private array $altUpdates = [];

    protected function setUp(): void
    {
        parent::setUp();
        $this->postUpdates = [];
        $this->altUpdates = [];

        $posts = [
            33 => new WP_Post(['ID' => 33, 'post_type' => 'attachment', 'post_status' => 'inherit', 'post_title' => 'Foto',
                'post_excerpt' => 'Alt-Unterschrift', 'post_modified_gmt' => '2026-09-25 08:00:00']),
            34 => new WP_Post(['ID' => 34, 'post_type' => 'attachment', 'post_status' => 'inherit', 'post_title' => 'Logo',
                'post_modified_gmt' => '2026-09-25 09:00:00']),
            35 => new WP_Post(['ID' => 35, 'post_type' => 'attachment', 'post_status' => 'trash', 'post_title' => 'Alt']),
            5 => new WP_Post(['ID' => 5, 'post_type' => 'page', 'post_title' => 'Seite']),
        ];
        Functions\when('get_post')->alias(static fn ($id) => $posts[(int) $id] ?? null);
        Functions\when('current_user_can')->justReturn(true);
        Functions\when('wp_kses_post')->alias(static fn ($value): string => strip_tags((string) $value, '<a><em><strong>'));
        Functions\when('metadata_exists')->justReturn(true);
        Functions\when('get_post_meta')->justReturn('alter Alt-Text');
        Functions\when('wp_update_post')->alias(function (array $data, bool $wpError) {
            $this->postUpdates[] = $data;

            return (int) $data['ID'];
        });
        Functions\when('update_post_meta')->alias(function (int $id, string $key, $value) {
            $this->altUpdates[] = [$id, $value];

            return true;
        });
    }

    private function log(int ...$ids): ChangeLog
    {
        $log = Mockery::mock(ChangeLog::class);
        if ($ids !== []) {
            $log->expects('record')->times(count($ids))->andReturn(...$ids);
        }

        return $log;
    }

    public function testUpdatesEveryItemAndReportsPerItem(): void
    {
        $log = Mockery::mock(ChangeLog::class);
        $log->expects('record')
            ->with('lit/media-update', 'attachment', '33', 'Metadaten von "Foto" geändert: alt, caption')
            ->andReturn(41);
        $log->expects('record')
            ->with('lit/media-update', 'attachment', '34', 'Metadaten von "Logo" geändert: title')
            ->andReturn(42);

        $result = (new MediaUpdateAbility($log))->execute(['items' => [
            ['id' => 33, 'alt' => 'Team vor dem Haus', 'caption' => 'Unser <script>x</script>Team'],
            ['id' => 34, 'title' => '<b>Firmen</b>logo', 'modified' => '2026-09-25 09:00:00'],
        ]]);

        self::assertSame([['post_excerpt' => 'Unser xTeam', 'ID' => 33], ['post_title' => 'Firmenlogo', 'ID' => 34]], $this->postUpdates);
        self::assertSame([[33, 'Team vor dem Haus']], $this->altUpdates);
        self::assertSame(['id' => 33, 'ok' => true, 'error' => null, 'log_id' => 41, 'modified' => '2026-09-25 08:00:00'], $result['results'][0]);
        self::assertSame(42, $result['results'][1]['log_id']);
        self::assertSame(['id' => '34', 'type' => 'attachment', 'action' => 'updated', 'label' => 'Firmenlogo'], $result['changed'][1]);
        self::assertSame('2 von 2 Medien aktualisiert.', $result['summary']);
    }

    public function testAnInvalidItemRefusesTheWholeBatchAndNamesEveryFailure(): void
    {
        $result = (new MediaUpdateAbility($this->log()))->execute(['items' => [
            ['id' => 33, 'alt' => 'ok'],
            ['id' => 99, 'alt' => 'x'],
            ['id' => 5, 'alt' => 'x'],
            ['id' => 35, 'alt' => 'x'],
        ]]);

        self::assertInstanceOf(WP_Error::class, $result);
        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertStringContainsString('3 von 4', $result->get_error_message());
        self::assertStringContainsString('nichts wurde gespeichert', $result->get_error_message());
        $failures = $result->get_error_data()['failures'];
        self::assertSame([1, 2, 3], array_column($failures, 'index'));
        self::assertSame(['not_found', 'not_found', 'validation_failed'], array_column($failures, 'code'));
        self::assertSame([99, 5, 35], array_column($failures, 'id'));
        self::assertStringContainsString('nicht gefunden', $failures[0]['error']);
        self::assertStringContainsString('Papierkorb', $failures[2]['error']);
        self::assertSame([], $this->postUpdates);
        self::assertSame([], $this->altUpdates);
    }

    public function testFailuresOfOneKindKeepTheirCodeAndReportTheNormalizedId(): void
    {
        $result = (new MediaUpdateAbility($this->log()))->execute(['items' => [['id' => '99', 'alt' => 'x']]]);

        self::assertSame('lit_not_found', $result->get_error_code());
        self::assertSame(99, $result->get_error_data()['failures'][0]['id']);
    }

    public function testRejectsEmptyDuplicateAndOverlongItems(): void
    {
        $result = (new MediaUpdateAbility($this->log()))->execute(['items' => [
            ['id' => 33],
            ['id' => 34, 'alt' => str_repeat('a', 501)],
            ['id' => 34, 'title' => 'doppelt'],
            ['id' => 33, 'caption' => ['kein', 'Text']],
        ]]);

        $failures = $result->get_error_data()['failures'];
        self::assertSame([0, 1, 2, 3], array_column($failures, 'index'));
        self::assertStringContainsString('Nichts zu ändern', $failures[0]['error']);
        self::assertStringContainsString('alt', $failures[1]['error']);
        self::assertStringContainsString('mehrfach', $failures[2]['error']);
        self::assertStringContainsString('caption', $failures[3]['error']);
        self::assertSame([], $this->postUpdates);
    }

    public function testStaleModifiedRefusesTheBatchWithRevMismatch(): void
    {
        $result = (new MediaUpdateAbility($this->log()))->execute(['items' => [
            ['id' => 33, 'alt' => 'neu', 'modified' => '2026-09-25 08:00:00'],
            ['id' => 34, 'alt' => 'neu', 'modified' => '2026-09-24 07:00:00'],
        ]]);

        self::assertSame('lit_rev_mismatch', $result->get_error_code());
        self::assertSame(1, $result->get_error_data()['failures'][0]['index']);
        self::assertStringContainsString('lit/media-get', $result->get_error_data()['hint']);
        self::assertSame([], $this->altUpdates);
    }

    public function testAFailedWriteRestoresTheItemsAlreadyChanged(): void
    {
        Functions\when('wp_update_post')->alias(function (array $data, bool $wpError) {
            $this->postUpdates[] = $data;

            return $data['ID'] === 34 && ($data['post_title'] ?? '') === 'Neu'
                ? new WP_Error('db', 'Datenbankfehler')
                : (int) $data['ID'];
        });

        try {
            (new MediaUpdateAbility($this->log()))->execute(['items' => [
                ['id' => 33, 'alt' => 'neu', 'caption' => 'neu'],
                ['id' => 34, 'title' => 'Neu'],
            ]]);
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
            self::assertSame('lit_write_failed', $e->toError()->get_error_code());
            self::assertStringContainsString('neu lesen', $e->toError()->get_error_data()['hint']);
            self::assertStringContainsString('Datenbankfehler', $e->getMessage());
        }

        // Item 34 was refused before anything was written; item 33 gets caption and alt back.
        self::assertSame([
            ['post_excerpt' => 'neu', 'ID' => 33],
            ['post_title' => 'Neu', 'ID' => 34],
            ['post_excerpt' => 'Alt-Unterschrift', 'ID' => 33],
        ], $this->postUpdates);
        self::assertSame([[33, 'neu'], [33, 'alter Alt-Text']], $this->altUpdates);
    }

    public function testAHookThrowingAfterTheWriteAlsoRestoresThatItem(): void
    {
        Functions\when('wp_update_post')->alias(function (array $data, bool $wpError) {
            $this->postUpdates[] = $data;
            if (($data['post_title'] ?? '') === 'Neu') {
                throw new RuntimeException('save_post hook failed');
            }

            return (int) $data['ID'];
        });

        $this->expectException(WriteFailed::class);
        try {
            (new MediaUpdateAbility($this->log()))->execute(['items' => [['id' => 34, 'title' => 'Neu']]]);
        } finally {
            self::assertSame([['post_title' => 'Neu', 'ID' => 34], ['post_title' => 'Logo', 'ID' => 34]], $this->postUpdates);
        }
    }

    public function testRestoreRemovesAnAltTextThatDidNotExistBefore(): void
    {
        Functions\when('metadata_exists')->justReturn(false);
        Functions\when('wp_update_post')->alias(static fn (array $data) => $data['ID'] === 34
            ? new WP_Error('db', 'Datenbankfehler')
            : (int) $data['ID']);
        Functions\expect('delete_post_meta')->once()->with(33, '_wp_attachment_image_alt')->andReturn(true);

        $this->expectException(WriteFailed::class);
        (new MediaUpdateAbility($this->log()))->execute(['items' => [
            ['id' => 33, 'alt' => 'neu'],
            ['id' => 34, 'title' => 'Neu'],
        ]]);
    }

    public function testAFailedRestoreIsAPartialWriteNamingTheChangedIds(): void
    {
        Functions\when('wp_update_post')->alias(static fn (array $data) => $data['ID'] === 34
            ? new WP_Error('db', 'Datenbankfehler')
            : (int) $data['ID']);
        Functions\when('update_post_meta')->alias(static function (int $id, string $key, $value) {
            if ($value === 'alter Alt-Text') {
                throw new RuntimeException('meta write failed');
            }

            return true;
        });
        $log = Mockery::mock(ChangeLog::class);
        $log->expects('recordPartial')->once()->with('lit/media-update', 'attachment', '33', Mockery::type('string'));

        try {
            (new MediaUpdateAbility($log))->execute(['items' => [
                ['id' => 33, 'alt' => 'neu'],
                ['id' => 34, 'title' => 'Neu'],
            ]]);
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            $error = $e->toError();
            self::assertSame('lit_partial_write', $error->get_error_code());
            self::assertSame([33], $error->get_error_data()['changed_ids']);
            self::assertStringContainsString('33', $error->get_error_message());
        }
    }

    public function testChangeLogFailureIsOnlyAWarning(): void
    {
        $log = Mockery::mock(ChangeLog::class);
        $log->expects('record')->andThrow(new RuntimeException('db down'));
        // error_log() is a PHP internal and cannot be stubbed; redirect it to a temp file instead.
        $file = (string) tempnam(sys_get_temp_dir(), 'lit-mcp-log');
        $previous = ini_set('error_log', $file);
        try {
            $result = (new MediaUpdateAbility($log))->execute(['items' => [['id' => 33, 'alt' => 'neu']]]);
        } finally {
            ini_set('error_log', (string) $previous);
            unlink($file);
        }

        self::assertTrue($result['results'][0]['ok']);
        self::assertNull($result['results'][0]['log_id']);
        self::assertCount(1, $result['warnings']);
    }

    public function testIsIdempotentIndirectAndNotDestructive(): void
    {
        $ability = new MediaUpdateAbility($this->log());

        self::assertSame(['readonly' => false, 'destructive' => false, 'idempotent' => true], $ability->annotations());
        self::assertFalse($ability->isDirect());
        self::assertSame(50, $ability->inputSchema()['properties']['items']['maxItems']);
        self::assertStringContainsString('modified', $ability->description());
    }
}