<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\WordPress\Status;

use Brain\Monkey\Functions;
use LIT\MCP\Abilities\WriteFailed;
use LIT\MCP\Integrations\WordPress\Status\PostCloner;
use LIT\MCP\Integrations\WordPress\Status\ReplaceFailed;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use RuntimeException;
use WP_Error;
use WP_Post;

final class PostClonerTest extends TestCase
{
    /** @var array<int, array<string, list<string|null>>> Stored meta by post ID, as meta_value strings. */
    private array $meta = [];

    /** @var list<array{0: int, 1: string, 2: string|null}> Raw postmeta inserts. */
    private array $inserts = [];

    private bool $insertFails = false;

    /** Post IDs whose meta SELECT fails: 'null' returns null, 'error' sets $wpdb->last_error. */
    private array $metaReadFails = [];

    protected function setUp(): void
    {
        parent::setUp();
        Functions\when('wp_cache_delete')->justReturn(true);
        Functions\when('get_post')->justReturn(null);
    }

    private function cloner(): PostCloner
    {
        $db = Mockery::mock(\wpdb::class)->makePartial();
        $db->allows('get_results')->andReturnUsing(function (string $sql) use ($db): ?array {
            preg_match('/post_id = (\d+)/', $sql, $match);
            $db->last_error = '';
            $failure = $this->metaReadFails[(int) $match[1]] ?? null;
            if ($failure === 'null') {
                return null;
            }
            if ($failure === 'error') {
                $db->last_error = 'Table wp_postmeta is marked as crashed';
                return [];
            }
            $rows = [];
            foreach ($this->meta[(int) $match[1]] ?? [] as $key => $values) {
                foreach ($values as $value) {
                    $rows[] = ['meta_key' => $key, 'meta_value' => $value];
                }
            }

            return $rows;
        });
        $db->allows('insert')->andReturnUsing(function (string $table, array $data, array $format) {
            self::assertSame('wp_postmeta', $table);
            self::assertSame(['%d', '%s', '%s'], $format);
            $this->inserts[] = [$data['post_id'], $data['meta_key'], $data['meta_value']];

            return $this->insertFails ? false : 1;
        });

        return new PostCloner($db);
    }

    private function original(): WP_Post
    {
        return new WP_Post([
            'ID' => 5,
            'post_type' => 'page',
            'post_title' => 'Team',
            'post_content' => '<!-- wp:divi/section /-->',
            'post_excerpt' => 'Kurz',
            'post_parent' => 2,
            'menu_order' => 3,
        ]);
    }

    private function copy(): WP_Post
    {
        return new WP_Post([
            'ID' => 77,
            'post_type' => 'page',
            'post_title' => 'Team (Kopie)',
            'post_content' => 'neu',
            'post_excerpt' => 'Neu kurz',
        ]);
    }

    public function testDuplicateCopiesContentMetaAndTermsAsDraft(): void
    {
        Functions\when('get_current_user_id')->justReturn(4);
        Functions\expect('wp_insert_post')->once()->with($this->draftMatcher('Team (Kopie)'), true)->andReturn(77);
        $this->meta = [
            5 => [
                '_edit_lock' => ['123:1'],
                '_edit_last' => ['1'],
                '_wp_old_slug' => ['team-alt'],
                '_lit_mcp_backup_of' => ['3'],
                '_et_pb_use_builder' => ['on'],
                '_et_pb_use_divi_5' => ['on'],
                '_wp_page_template' => ['page-template-blank.php'],
                '_thumbnail_id' => ['31'],
                'role' => ['Leitung'],
            ],
            // Meta a save hook put on the fresh copy is replaced by the original's.
            77 => ['_edit_lock' => ['999:4'], '_et_pb_use_builder' => ['off']],
        ];
        Functions\expect('delete_post_meta')->once()->with(77, '_et_pb_use_builder');
        Functions\when('get_object_taxonomies')->justReturn(['category']);
        Functions\when('wp_get_object_terms')->justReturn([4, 9]);
        Functions\expect('wp_set_object_terms')->once()->with(77, [4, 9], 'category', false);
        Functions\expect('update_post_meta')->once()->with(77, '_lit_mcp_copy_of', 5);

        self::assertSame(77, $this->cloner()->duplicate($this->original()));
        self::assertSame([
            [77, '_et_pb_use_builder', 'on'],
            [77, '_et_pb_use_divi_5', 'on'],
            [77, '_wp_page_template', 'page-template-blank.php'],
            [77, '_thumbnail_id', '31'],
            [77, 'role', 'Leitung'],
        ], $this->inserts);
    }

    public function testMetaIsCopiedByteExact(): void
    {
        Functions\when('get_current_user_id')->justReturn(4);
        Functions\when('wp_insert_post')->justReturn(77);
        Functions\when('get_object_taxonomies')->justReturn([]);
        Functions\when('update_post_meta')->justReturn(true);
        $raw = [
            'path' => ['a:1:{s:1:"p";s:9:"C:\\new\\x\\";}'],
            'quoted' => ['Er sagte \\"hallo\\"'],
            'flag' => ['b:0;'],
            'object' => ['O:8:"stdClass":1:{s:1:"a";i:1;}'],
            'empty' => [''],
            'null' => [null],
        ];
        $this->meta = [5 => $raw];

        $this->cloner()->duplicate($this->original());

        self::assertSame([
            [77, 'path', 'a:1:{s:1:"p";s:9:"C:\\new\\x\\";}'],
            [77, 'quoted', 'Er sagte \\"hallo\\"'],
            [77, 'flag', 'b:0;'],
            [77, 'object', 'O:8:"stdClass":1:{s:1:"a";i:1;}'],
            [77, 'empty', ''],
            [77, 'null', null],
        ], $this->inserts);
    }

    public function testDuplicateFailureThrows(): void
    {
        Functions\when('get_current_user_id')->justReturn(4);
        Functions\when('wp_insert_post')->justReturn(new WP_Error('x', 'kaputt'));

        $this->expectException(RuntimeException::class);

        $this->cloner()->duplicate($this->original());
    }

    public function testDuplicateFailingAfterInsertDeletesTheNewDraft(): void
    {
        Functions\when('get_current_user_id')->justReturn(4);
        Functions\when('wp_insert_post')->justReturn(77);
        $this->meta = [5 => ['role' => ['Leitung']]];
        $this->insertFails = true;
        Functions\expect('wp_delete_post')->once()->with(77, true)->andReturn(new WP_Post(['ID' => 77]));

        try {
            $this->cloner()->duplicate($this->original());
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
        }
    }

    public function testDuplicateReportsALeftoverDraftWhenItCannotBeDeleted(): void
    {
        Functions\when('get_current_user_id')->justReturn(4);
        Functions\when('wp_insert_post')->justReturn(77);
        Functions\when('get_object_taxonomies')->justReturn(['category']);
        Functions\when('wp_get_object_terms')->justReturn(new WP_Error('x', 'kaputt'));
        Functions\when('wp_delete_post')->justReturn(false);

        try {
            $this->cloner()->duplicate($this->original());
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertFalse($e->rolledBack);
            self::assertSame(77, $e->postId);
        }
    }

    public function testBackupIsAFullCloneInTheTrash(): void
    {
        Functions\when('get_current_user_id')->justReturn(4);
        Functions\expect('wp_insert_post')->once()->with($this->draftMatcher('Team (Sicherung)'), true)->andReturn(88);
        $this->meta = [5 => ['_et_pb_use_builder' => ['on'], '_lit_mcp_copy_of' => ['1']]];
        Functions\when('get_object_taxonomies')->justReturn(['category']);
        Functions\when('wp_get_object_terms')->justReturn([4]);
        Functions\expect('wp_set_object_terms')->once()->with(88, [4], 'category', false);
        Functions\expect('update_post_meta')->once()->with(88, '_lit_mcp_backup_of', 5)->andReturn(12);
        Functions\expect('wp_trash_post')->once()->with(88)->andReturn(new WP_Post(['ID' => 88]));
        Functions\when('get_post_status')->justReturn('trash');
        Functions\expect('wp_delete_post')->never();

        self::assertSame(88, $this->cloner()->backup($this->original()));
        self::assertSame([[88, '_et_pb_use_builder', 'on']], $this->inserts);
    }

    public function testABackupThatCannotBeTrashedIsDeletedAgain(): void
    {
        Functions\when('get_current_user_id')->justReturn(4);
        Functions\when('wp_insert_post')->justReturn(88);
        Functions\when('get_object_taxonomies')->justReturn([]);
        Functions\when('update_post_meta')->justReturn(12);
        Functions\when('wp_trash_post')->justReturn(new WP_Post(['ID' => 88]));
        Functions\when('get_post_status')->justReturn('draft');
        Functions\expect('wp_delete_post')->once()->with(88, true)->andReturn(new WP_Post(['ID' => 88]));

        try {
            $this->cloner()->backup($this->original());
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
            self::assertToolError($e->toError(), 'write_failed');
        }
    }

    public function testReplaceOverwritesContentMetaAndTermsButKeepsTheOriginalsIdentity(): void
    {
        Functions\expect('wp_update_post')->once()->with([
            'ID' => 5,
            'post_title' => 'Team',
            'post_content' => 'neu',
            'post_excerpt' => 'Neu kurz',
        ], true)->andReturn(5);
        $this->meta = [
            5 => ['_edit_lock' => ['1'], '_wp_old_slug' => ['alt'], 'role' => ['Alt'], 'city' => ['Trier']],
            77 => ['_lit_mcp_copy_of' => ['5'], '_edit_last' => ['4'], 'role' => ['Neu']],
        ];
        Functions\expect('delete_post_meta')->once()->with(5, 'role');
        Functions\expect('delete_post_meta')->once()->with(5, 'city');
        Functions\when('get_object_taxonomies')->justReturn(['category']);
        Functions\when('wp_get_object_terms')->justReturn([12]);
        Functions\expect('wp_set_object_terms')->once()->with(5, [12], 'category', false);

        $this->cloner()->replace($this->original(), $this->copy());

        self::assertSame([[5, 'role', 'Neu']], $this->inserts);
    }

    public function testAReplaceRejectedByWordPressNamesOnlyThePostRow(): void
    {
        Functions\when('get_object_taxonomies')->justReturn([]);
        Functions\when('wp_update_post')->justReturn(new WP_Error('x', 'kaputt'));
        Functions\expect('delete_post_meta')->never();

        try {
            $this->cloner()->replace($this->original(), $this->copy());
            self::fail('ReplaceFailed expected');
        } catch (ReplaceFailed $e) {
            self::assertSame(['post'], $e->parts);
        }
    }

    public function testAFailingTermStepNamesAllParts(): void
    {
        Functions\when('wp_update_post')->justReturn(5);
        Functions\when('get_object_taxonomies')->justReturn(['category']);
        Functions\when('wp_get_object_terms')->justReturn([12]);
        Functions\when('wp_set_object_terms')->justReturn(new WP_Error('x', 'kaputt'));

        try {
            $this->cloner()->replace($this->original(), $this->copy());
            self::fail('ReplaceFailed expected');
        } catch (ReplaceFailed $e) {
            self::assertSame(['post', 'meta', 'terms'], $e->parts);
        }
    }

    /** @return array<string, array{0: string}> */
    public function metaReadFailures(): array
    {
        return ['null result' => ['null'], 'database error' => ['error']];
    }

    /** @dataProvider metaReadFailures */
    public function testAFailedMetaReadIsAnErrorNotEmptyMeta(string $failure): void
    {
        $this->metaReadFails = [5 => $failure];
        Functions\when('get_object_taxonomies')->justReturn([]);

        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessage('Meta of post 5 could not be read');

        $this->cloner()->snapshot($this->original());
    }

    /** @dataProvider metaReadFailures */
    public function testReplaceReadsTheCopyBeforeWritingAnything(string $failure): void
    {
        $this->metaReadFails = [77 => $failure];
        Functions\when('get_object_taxonomies')->justReturn([]);
        Functions\expect('wp_update_post')->never();
        Functions\expect('delete_post_meta')->never();

        try {
            $this->cloner()->replace($this->original(), $this->copy());
            self::fail('ReplaceFailed expected');
        } catch (ReplaceFailed $e) {
            self::assertSame([], $e->parts);
            self::assertStringContainsString('Meta of post 77 could not be read', $e->getMessage());
        }
    }

    public function testADuplicateWithAFailedMetaReadIsDeletedAgain(): void
    {
        $this->metaReadFails = [5 => 'error'];
        Functions\when('get_current_user_id')->justReturn(3);
        Functions\when('wp_insert_post')->justReturn(90);
        Functions\expect('wp_delete_post')->once()->with(90, true)->andReturn(new WP_Post(['ID' => 90]));

        try {
            $this->cloner()->duplicate($this->original());
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
        }
    }

    private function missedSchedule(): void
    {
        Functions\when('get_post')->justReturn(new WP_Post([
            'ID' => 5,
            'post_type' => 'page',
            'post_status' => 'future',
            'post_date_gmt' => gmdate('Y-m-d H:i:s', time() - 60),
        ]));
    }

    public function testReplaceRefusesAMissedScheduleBeforeWriting(): void
    {
        $this->missedSchedule();
        Functions\when('get_object_taxonomies')->justReturn([]);
        Functions\expect('wp_update_post')->never();

        try {
            $this->cloner()->replace($this->original(), $this->copy());
            self::fail('ReplaceFailed expected');
        } catch (ReplaceFailed $e) {
            self::assertSame([], $e->parts);
            self::assertStringContainsString('missed schedule', $e->getMessage());
        }
    }

    public function testRestoreNeverRewritesTheRowOfAMissedSchedule(): void
    {
        $this->missedSchedule();
        Functions\expect('wp_update_post')->never();

        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessage('missed schedule');

        $this->cloner()->restore($this->original(), [
            'post' => ['post_title' => 'Team', 'post_content' => '', 'post_excerpt' => ''],
            'meta' => [],
            'terms' => [],
        ], ['post']);
    }

    public function testSnapshotAndRestoreBringBackRowMetaAndTerms(): void
    {
        $this->meta = [5 => ['_edit_lock' => ['1'], 'role' => ['b:0;']]];
        Functions\when('get_object_taxonomies')->justReturn(['category']);
        Functions\when('wp_get_object_terms')->justReturn([4]);

        $cloner = $this->cloner();
        $snapshot = $cloner->snapshot($this->original());

        self::assertSame(['post_title' => 'Team', 'post_content' => '<!-- wp:divi/section /-->', 'post_excerpt' => 'Kurz'], $snapshot['post']);
        self::assertSame(['role' => ['b:0;']], $snapshot['meta']);
        self::assertSame(['category' => [4]], $snapshot['terms']);

        $this->meta = [5 => ['_edit_lock' => ['1'], 'role' => ['Neu'], 'city' => ['Trier']]];
        Functions\expect('wp_update_post')->once()
            ->with(array_merge(['ID' => 5], $snapshot['post']), true)->andReturn(5);
        Functions\expect('delete_post_meta')->once()->with(5, 'role');
        Functions\expect('delete_post_meta')->once()->with(5, 'city');
        Functions\expect('wp_set_object_terms')->once()->with(5, [4], 'category', false);

        $cloner->restore($this->original(), $snapshot);

        self::assertSame([[5, 'role', 'b:0;']], $this->inserts);
    }

    public function testRestoreWritesOnlyThePartsReached(): void
    {
        Functions\expect('wp_update_post')->once()->andReturn(5);
        Functions\expect('delete_post_meta')->never();
        Functions\expect('wp_set_object_terms')->never();

        $this->cloner()->restore($this->original(), [
            'post' => ['post_title' => 'Team', 'post_content' => '', 'post_excerpt' => ''],
            'meta' => ['role' => ['Alt']],
            'terms' => ['category' => [4]],
        ], ['post']);

        self::assertSame([], $this->inserts);
    }

    public function testRestoreTriesEveryPartAndReportsFailures(): void
    {
        Functions\when('wp_update_post')->justReturn(new WP_Error('x', 'kaputt'));
        Functions\expect('wp_set_object_terms')->once()->with(5, [4], 'category', false);

        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessage('Restore incomplete');

        $this->cloner()->restore($this->original(), [
            'post' => ['post_title' => 'Team', 'post_content' => '', 'post_excerpt' => ''],
            'meta' => [],
            'terms' => ['category' => [4]],
        ]);
    }

    private function draftMatcher(string $title): \Mockery\Matcher\Closure
    {
        return Mockery::on(static fn (array $data): bool => $data['post_status'] === 'draft'
            && $data['post_type'] === 'page'
            && $data['post_title'] === $title
            && $data['post_content'] === '<!-- wp:divi/section /-->'
            && $data['post_excerpt'] === 'Kurz'
            && $data['post_parent'] === 2
            && $data['menu_order'] === 3
            && $data['post_author'] === 4);
    }
}