<?php

declare(strict_types=1);

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

use Brain\Monkey\Functions;
use LIT\MCP\Abilities\Rev;
use LIT\MCP\Abilities\WriteFailed;
use LIT\MCP\ChangeLog\ChangeLog;
use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
use LIT\MCP\Integrations\WordPress\Status\PostCloner;
use LIT\MCP\Integrations\WordPress\Status\PostReplaceWithCopyAbility;
use LIT\MCP\Integrations\WordPress\Status\ReplaceFailed;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use RuntimeException;
use WP_Post;

final class PostReplaceWithCopyAbilityTest extends TestCase
{
    private const SNAPSHOT = ['post' => ['post_title' => 'Team'], 'meta' => [], 'terms' => []];

    private WP_Post $original;
    private WP_Post $copy;

    protected function setUp(): void
    {
        parent::setUp();
        $this->original = new WP_Post(['ID' => 5, 'post_type' => 'page', 'post_title' => 'Team', 'post_status' => 'publish']);
        $this->copy = new WP_Post(['ID' => 77, 'post_type' => 'page', 'post_title' => 'Team (Kopie)', 'post_status' => 'draft']);
        Functions\when('get_post')->alias(fn (int $id) => $id === 5 ? $this->original : $this->copy);
        Functions\when('current_user_can')->justReturn(true);
        Functions\when('get_post_type_object')->justReturn((object) ['cap' => (object) ['create_posts' => 'edit_pages']]);
        Functions\when('get_post_meta')->justReturn('5');
        Functions\when('get_permalink')->justReturn('https://kunde.de/team/');
        Functions\when('get_edit_post_link')->justReturn('https://kunde.de/wp-admin/post.php?post=5&action=edit');
    }

    private function ability(PostCloner $cloner, ChangeLog $log, bool $trash = true): PostReplaceWithCopyAbility
    {
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('isManaged')->andReturn(true);

        return new PostReplaceWithCopyAbility($schema, $cloner, $log, static fn (): bool => $trash);
    }

    /** @return array<string, mixed> */
    private function input(array $extra = []): array
    {
        return array_merge(
            ['original_id' => 5, 'copy_id' => 77, 'rev' => Rev::ofPost($this->original), 'confirm' => true],
            $extra
        );
    }

    private function revisionAt900(): void
    {
        Functions\when('wp_save_post_revision')->justReturn(900);
        Functions\when('wp_get_post_revisions')->justReturn([900 => new WP_Post(['ID' => 900])]);
    }

    public function testRequiresConfirmation(): void
    {
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('replace')->never();

        $result = $this->ability($cloner, Mockery::mock(ChangeLog::class))
            ->execute(['original_id' => 5, 'copy_id' => 77, 'rev' => Rev::ofPost($this->original)]);

        self::assertSame('lit_confirm_required', $result->get_error_code());
    }

    public function testCopyMustStemFromTheOriginal(): void
    {
        Functions\when('get_post_meta')->justReturn('12');
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('replace')->never();

        $result = $this->ability($cloner, Mockery::mock(ChangeLog::class))->execute($this->input());

        self::assertSame('lit_validation_failed', $result->get_error_code());
    }

    /** @return list<array{0: string, 1: string}> */
    public function refusedStatuses(): array
    {
        return [
            'trashed copy' => ['copy', 'trash'],
            'published copy' => ['copy', 'publish'],
            'scheduled copy' => ['copy', 'future'],
            'trashed original' => ['original', 'trash'],
        ];
    }

    /** @dataProvider refusedStatuses */
    public function testRefusesCopiesThatAreNoDraftAndTrashedOriginals(string $which, string $status): void
    {
        $this->{$which}->post_status = $status;
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('backup')->never();
        $cloner->expects('replace')->never();

        $result = $this->ability($cloner, Mockery::mock(ChangeLog::class))->execute($this->input());

        self::assertSame('lit_validation_failed', $result->get_error_code());
    }

    public function testAMissedScheduleOfTheOriginalIsRefused(): void
    {
        $this->original->post_status = 'future';
        $this->original->post_date_gmt = gmdate('Y-m-d H:i:s', time() - 600);
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('backup')->never();
        $cloner->expects('replace')->never();

        $result = $this->ability($cloner, Mockery::mock(ChangeLog::class))->execute($this->input());

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertArrayHasKey('original_id', $result->get_error_data()['fields']);
    }

    public function testAPendingCopyIsAccepted(): void
    {
        $this->copy->post_status = 'pending';
        $this->revisionAt900();
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->allows('snapshot')->andReturn(self::SNAPSHOT);
        $cloner->allows('backup')->andReturn(88);
        $cloner->expects('replace');
        Functions\when('wp_trash_post')->justReturn(new WP_Post(['ID' => 77]));
        $log = Mockery::mock(ChangeLog::class);
        $log->allows('record')->andReturn(11);

        self::assertTrue($this->ability($cloner, $log)->execute($this->input())['ok']);
    }

    public function testAStaleRevOfTheOriginalIsRefused(): void
    {
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('replace')->never();
        Functions\expect('wp_save_post_revision')->never();

        $result = $this->ability($cloner, Mockery::mock(ChangeLog::class))->execute($this->input(['rev' => 'veraltet']));

        self::assertSame('lit_rev_mismatch', $result->get_error_code());
    }

    public function testDisabledTrashIsRefusedBeforeAnyChange(): void
    {
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('replace')->never();

        $result = $this->ability($cloner, Mockery::mock(ChangeLog::class), false)->execute($this->input());

        self::assertSame('lit_unsupported', $result->get_error_code());
    }

    public function testRevisionThenReplaceThenTrashTheCopy(): void
    {
        $order = [];
        Functions\expect('wp_save_post_revision')->once()->with(5)->andReturnUsing(static function () use (&$order) {
            $order[] = 'revision';
            return 900;
        });
        Functions\when('wp_get_post_revisions')->justReturn([900 => new WP_Post(['ID' => 900])]);
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('snapshot')->with($this->original)->andReturnUsing(static function () use (&$order): array {
            $order[] = 'snapshot';
            return self::SNAPSHOT;
        });
        $cloner->expects('backup')->with($this->original)->andReturnUsing(static function () use (&$order): int {
            $order[] = 'backup';
            return 88;
        });
        $cloner->expects('replace')->with($this->original, $this->copy)->andReturnUsing(static function () use (&$order): void {
            $order[] = 'replace';
        });
        $cloner->expects('restore')->never();
        Functions\expect('wp_trash_post')->once()->with(77)->andReturnUsing(static function () use (&$order): WP_Post {
            $order[] = 'trash';
            return new WP_Post(['ID' => 77]);
        });
        $log = Mockery::mock(ChangeLog::class);
        $log->expects('record')->with('lit/post-replace-with-copy', 'page', '5', Mockery::type('string'), 900)->andReturn(11);

        $result = $this->ability($cloner, $log)->execute($this->input());

        self::assertSame(['snapshot', 'backup', 'revision', 'replace', 'trash'], $order);
        self::assertSame(88, $result['backup_id']);
        self::assertStringContainsString('Sicherung ID 88 im Papierkorb', $result['summary']);
        self::assertSame(900, $result['revision_id']);
        self::assertSame(11, $result['log_id']);
        self::assertSame(Rev::ofPost($this->original), $result['rev']);
        self::assertSame(['replaced', 'trashed'], array_column($result['changed'], 'action'));
        self::assertSame([], $result['warnings']);
    }

    public function testAFailedTrashOfTheCopyIsAWarningOnly(): void
    {
        $this->revisionAt900();
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->allows('snapshot')->andReturn(self::SNAPSHOT);
        $cloner->allows('backup')->andReturn(88);
        $cloner->expects('replace');
        Functions\when('wp_trash_post')->justReturn(false);
        $log = Mockery::mock(ChangeLog::class);
        $log->allows('record')->andReturn(11);

        $result = $this->ability($cloner, $log)->execute($this->input());

        self::assertTrue($result['ok']);
        self::assertSame(['replaced'], array_column($result['changed'], 'action'));
        self::assertSame(['Kopie 77 konnte nicht in den Papierkorb gelegt werden'], $result['warnings']);
    }

    public function testAFailedReplaceRestoresTheOriginal(): void
    {
        $this->revisionAt900();
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->allows('snapshot')->andReturn(self::SNAPSHOT);
        $cloner->allows('backup')->andReturn(88);
        $cloner->expects('replace')->andThrow(new ReplaceFailed(['post'], new RuntimeException('row kaputt')));
        $cloner->expects('restore')->with($this->original, self::SNAPSHOT, ['post']);
        Functions\expect('wp_trash_post')->never();

        try {
            $this->ability($cloner, Mockery::mock(ChangeLog::class))->execute($this->input());
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
            self::assertSame('lit_write_failed', $e->toError()->get_error_code());
            self::assertSame(88, $e->toError()->get_error_data()['backup_id']);
            $message = $e->toError()->get_error_message();
            self::assertStringNotContainsString('Nichts wurde gespeichert', $message);
            self::assertStringContainsString('Die Änderung wurde nicht gespeichert (Sicherung 88', $message);
        }
    }

    public function testAnIncompleteRestoreIsAPartialWrite(): void
    {
        $this->revisionAt900();
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->allows('snapshot')->andReturn(self::SNAPSHOT);
        $cloner->allows('backup')->andReturn(88);
        $cloner->expects('replace')->andThrow(new RuntimeException('hook kaputt'));
        $cloner->expects('restore')->with($this->original, self::SNAPSHOT, PostCloner::PARTS)->andThrow(new RuntimeException('Restore incomplete: terms'));
        Functions\expect('wp_trash_post')->never();
        $log = Mockery::mock(ChangeLog::class);
        $log->expects('recordPartial')
            ->with('lit/post-replace-with-copy', 'page', '5', Mockery::type('string'), 900)
            ->andReturn(12);

        try {
            $this->ability($cloner, $log)->execute($this->input());
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertFalse($e->rolledBack);
            self::assertSame(5, $e->postId);
            self::assertSame(900, $e->revisionId);
            $error = $e->toError();
            self::assertSame('lit_partial_write', $error->get_error_code());
            self::assertSame(88, $error->get_error_data()['backup_id']);
            self::assertStringContainsString('Sicherung', $error->get_error_message());
            self::assertStringContainsString('88', $error->get_error_message());
        }
    }

    public function testNeedsTheRightToCreateEntriesForTheBackup(): void
    {
        Functions\when('current_user_can')->alias(static fn (string $cap): bool => $cap !== 'edit_pages');
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->expects('backup')->never();
        $cloner->expects('replace')->never();
        $ability = $this->ability($cloner, Mockery::mock(ChangeLog::class));

        self::assertSame('lit_forbidden', $ability->permission($this->input())->get_error_code());
        self::assertSame('lit_forbidden', $ability->execute($this->input())->get_error_code());
    }

    public function testAFailedBackupAbortsBeforeTheOriginalIsTouched(): void
    {
        $cloner = Mockery::mock(PostCloner::class);
        $cloner->allows('snapshot')->andReturn(self::SNAPSHOT);
        $cloner->expects('backup')->andThrow(WriteFailed::rolledBack('Die Sicherung konnte nicht angelegt werden.'));
        $cloner->expects('replace')->never();
        $cloner->expects('restore')->never();
        Functions\expect('wp_save_post_revision')->never();
        Functions\expect('wp_trash_post')->never();

        try {
            $this->ability($cloner, Mockery::mock(ChangeLog::class))->execute($this->input());
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertSame('lit_write_failed', $e->toError()->get_error_code());
        }
    }

    public function testRequiresRevAndIsDestructive(): void
    {
        $ability = $this->ability(Mockery::mock(PostCloner::class), Mockery::mock(ChangeLog::class));

        self::assertContains('rev', $ability->inputSchema()['required']);
        self::assertContains('backup_id', $ability->outputSchema()['required']);
        self::assertTrue($ability->annotations()['destructive']);
        self::assertFalse($ability->annotations()['idempotent']);
        self::assertFalse($ability->isDirect());
    }
}