<?php

declare(strict_types=1);

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

use Brain\Monkey\Functions;
use LIT\MCP\Integrations\WordPress\Content\PostWriter;
use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
use LIT\MCP\Integrations\WordPress\Schema\FieldDefinition;
use LIT\MCP\Integrations\WordPress\Schema\FieldSource;
use LIT\MCP\Integrations\WordPress\Schema\FieldValidator;
use LIT\MCP\Integrations\WordPress\Schema\RegisteredMetaSource;
use LIT\MCP\Integrations\WordPress\Schema\TermAssigner;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use RuntimeException;
use WP_Post;

final class PostWriterTest extends TestCase
{
    private function stubTheme(): void
    {
        $theme = Mockery::mock();
        $theme->allows('get_page_templates')->with(null, 'lit_person')->andReturn(['tpl-wide.php' => 'Breit']);
        Functions\when('wp_get_theme')->justReturn($theme);
    }

    public function testPrepareCollectsAllErrorsWithPaths(): void
    {
        $this->stubTheme();
        Functions\when('get_object_taxonomies')->justReturn([]);
        Functions\when('post_type_supports')->justReturn(false);
        Functions\when('get_post')->justReturn(new WP_Post(['ID' => 3, 'post_type' => 'post']));
        Functions\when('is_post_type_hierarchical')->justReturn(true);
        Functions\when('get_post_ancestors')->justReturn([]);
        Functions\when('current_user_can')->justReturn(true);
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn([
            'role' => new FieldDefinition('role', 'Funktion', 'string', 'pods', 'writable', true),
        ]);
        $writer = new PostWriter($schema, new FieldValidator(), new TermAssigner());

        $result = $writer->prepare('lit_person', [
            'terms' => ['genre' => [1]],
            'featured_image' => 9,
            'parent' => 3,
            'template' => 'fehlt.php',
        ], true);

        $fields = $result->get_error_data()['fields'];
        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertSame('Pflichtfeld fehlt.', $fields['fields.role']);
        self::assertSame('Taxonomie gehört nicht zu diesem Inhaltstyp.', $fields['terms.genre']);
        self::assertSame('Inhaltstyp unterstützt kein Beitragsbild.', $fields['featured_image']);
        self::assertStringContainsString('denselben Inhaltstyp', $fields['parent']);
        self::assertStringContainsString('tpl-wide.php', $fields['template']);
    }

    private function writerWithoutFields(): PostWriter
    {
        Functions\when('get_object_taxonomies')->justReturn([]);
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn([]);

        return new PostWriter($schema, new FieldValidator(), new TermAssigner());
    }

    /** @param array<string, mixed> $input */
    private function errorFor(PostWriter $writer, array $input, string $path): string
    {
        $result = $writer->prepare('page', $input, false);
        self::assertFalse(is_array($result), $path . ' should be rejected');

        return (string) $result->get_error_data()['fields'][$path];
    }

    public function testParentMustBeAReadableNonDescendantEntryOfAHierarchicalType(): void
    {
        $writer = $this->writerWithoutFields();
        Functions\when('get_post')->justReturn(new WP_Post(['ID' => 8, 'post_type' => 'page']));
        Functions\when('get_post_ancestors')->justReturn([5, 1]);
        Functions\when('current_user_can')->justReturn(true);

        Functions\when('is_post_type_hierarchical')->justReturn(false);
        self::assertStringContainsString('hierarchisch', $this->errorFor($writer, ['parent' => 8], 'parent'));

        Functions\when('is_post_type_hierarchical')->justReturn(true);
        self::assertStringContainsString('selbst', $this->errorFor($writer, ['post_id' => 8, 'parent' => 8], 'parent'));
        self::assertStringContainsString('untergeordnet', $this->errorFor($writer, ['post_id' => 5, 'parent' => 8], 'parent'));
        self::assertIsArray($writer->prepare('page', ['post_id' => 9, 'parent' => 8], false));

        Functions\when('current_user_can')->justReturn(false);
        self::assertStringContainsString('Berechtigung', $this->errorFor($writer, ['parent' => 8], 'parent'));
    }

    public function testFeaturedImageMustBeReadable(): void
    {
        $writer = $this->writerWithoutFields();
        Functions\when('post_type_supports')->justReturn(true);
        Functions\when('wp_attachment_is_image')->justReturn(true);
        Functions\expect('current_user_can')->once()->with('read_post', 9)->andReturn(false);

        self::assertStringContainsString('Berechtigung', $this->errorFor($writer, ['featured_image' => 9], 'featured_image'));
    }

    public function testKnownDefaultAndEmptyTemplatesAreValid(): void
    {
        $this->stubTheme();
        Functions\when('get_object_taxonomies')->justReturn([]);
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn([]);
        $writer = new PostWriter($schema, new FieldValidator(), new TermAssigner());

        foreach (['tpl-wide.php', 'default', ''] as $template) {
            self::assertIsArray($writer->prepare('lit_person', ['template' => $template], false), $template);
        }
    }

    public function testPrepareReturnsValuesTermsAndWarnings(): void
    {
        Functions\when('get_object_taxonomies')->justReturn([]);
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn(['city' => new FieldDefinition('city', 'city', 'unknown', 'sample', 'unknown')]);

        $result = (new PostWriter($schema, new FieldValidator(), new TermAssigner()))
            ->prepare('page', ['fields' => ['city' => 'Trier']], false);

        self::assertSame(['city' => 'Trier'], $result['fields']);
        self::assertSame([], $result['terms']);
        self::assertCount(1, $result['warnings']);
    }

    public function testPostDataMapsOnlyGivenKeys(): void
    {
        $writer = new PostWriter(Mockery::mock(ContentSchema::class), new FieldValidator(), new TermAssigner());

        // wp_insert_post() ignores an empty page_template, so "empty = default template" is sent as 'default'.
        self::assertSame(
            ['post_title' => 'Team', 'post_name' => 'team', 'page_template' => 'default'],
            $writer->postData(['title' => 'Team', 'slug' => 'team', 'template' => '', 'fields' => []])
        );
        self::assertTrue($writer->hasExtras(['featured_image' => null]));
        self::assertFalse($writer->hasExtras(['title' => 'x', 'fields' => []]));
    }

    public function testWriteExtrasGroupsFieldsBySourceAndHandlesTheFeaturedImage(): void
    {
        $role = new FieldDefinition('role', 'Funktion', 'string', 'pods', 'writable');
        $city = new FieldDefinition('city', 'city', 'unknown', 'sample', 'unknown');
        $definitions = ['city' => $city, 'role' => $role];
        $pods = Mockery::mock(FieldSource::class);
        $pods->expects('write')->with(5, 'lit_person', ['role' => 'Leitung'], $definitions);
        $sample = Mockery::mock(FieldSource::class);
        $sample->expects('write')->with(5, 'lit_person', ['city' => 'Trier'], $definitions);
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn($definitions);
        $schema->allows('sourceOf')->andReturnUsing(static fn (FieldDefinition $f) => $f->source === 'pods' ? $pods : $sample);
        Functions\expect('delete_post_thumbnail')->once()->with(5);

        (new PostWriter($schema, new FieldValidator(), new TermAssigner()))->writeExtras(
            5,
            'lit_person',
            ['fields' => ['role' => 'Leitung', 'city' => 'Trier'], 'terms' => [], 'warnings' => []],
            ['featured_image' => 0]
        );
    }

    public function testAFeaturedImageThatDidNotStickThrows(): void
    {
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn([]);
        Functions\when('set_post_thumbnail')->justReturn(false);
        Functions\when('get_post_thumbnail_id')->justReturn(0);

        $this->expectException(RuntimeException::class);
        (new PostWriter($schema, new FieldValidator(), new TermAssigner()))->writeExtras(
            5,
            'lit_person',
            ['fields' => [], 'terms' => [], 'warnings' => []],
            ['featured_image' => 9]
        );
    }

    public function testSnapshotKeepsTheOldValuesOfEverythingThatWillBeWrittenAndRestoreWritesThemBack(): void
    {
        $role = new FieldDefinition('role', 'Funktion', 'string', 'pods', 'writable');
        $city = new FieldDefinition('city', 'city', 'unknown', 'sample', 'unknown');
        $definitions = ['city' => $city, 'role' => $role];
        $pods = Mockery::mock(FieldSource::class);
        $pods->allows('read')->with(5, $role)->andReturn('Alt');
        $pods->expects('write')->with(5, 'lit_person', ['role' => 'Alt'], $definitions);
        $sample = Mockery::mock(FieldSource::class);
        $sample->allows('read')->with(5, $city)->andReturn('');
        $sample->expects('write')->with(5, 'lit_person', ['city' => ''], $definitions);
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn($definitions);
        $schema->allows('sourceOf')->andReturnUsing(static fn (FieldDefinition $f) => $f->source === 'pods' ? $pods : $sample);
        Functions\expect('wp_get_object_terms')->once()->with(5, 'category', ['fields' => 'ids'])->andReturn(['2', 3]);
        Functions\when('get_post_thumbnail_id')->justReturn(7);
        $writer = new PostWriter($schema, new FieldValidator(), new TermAssigner());

        $snapshot = $writer->snapshot(
            5,
            'lit_person',
            ['fields' => ['role' => 'Neu', 'city' => 'Trier'], 'terms' => ['category' => [4]], 'warnings' => []],
            ['featured_image' => 9]
        );

        self::assertSame(
            ['fields' => ['role' => 'Alt', 'city' => ''], 'terms' => ['category' => [2, 3]], 'featured_image' => 7],
            $snapshot
        );

        Functions\expect('wp_set_object_terms')->once()->with(5, [2, 3], 'category', false)->andReturn([2, 3]);
        Functions\expect('set_post_thumbnail')->once()->with(5, 7)->andReturn(true);
        $writer->restore(5, 'lit_person', $snapshot);
    }

    public function testSnapshotTellsAbsentMetaFromStoredEmptyValues(): void
    {
        $kept = new FieldDefinition('kept', 'kept', 'string', 'meta', 'writable');
        $absent = new FieldDefinition('absent', 'absent', 'string', 'meta', 'writable');
        $flag = new FieldDefinition('flag', 'flag', 'boolean', 'pods', 'writable');
        $pods = Mockery::mock(FieldSource::class);
        $pods->allows('read')->andReturn(false);
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn(['absent' => $absent, 'flag' => $flag, 'kept' => $kept]);
        $schema->allows('sourceOf')->andReturnUsing(
            static fn (FieldDefinition $f) => $f->source === 'pods' ? $pods : new RegisteredMetaSource()
        );
        Functions\when('get_post_meta')->justReturn('');
        Functions\when('metadata_exists')->alias(static fn (string $type, int $id, string $key): bool => $key === 'kept');

        $snapshot = (new PostWriter($schema, new FieldValidator(), new TermAssigner()))->snapshot(
            5,
            'lit_person',
            ['fields' => ['kept' => 'x', 'absent' => 'y', 'flag' => true], 'terms' => [], 'warnings' => []],
            []
        );

        self::assertSame(['kept' => '', 'absent' => null, 'flag' => false], $snapshot['fields']);
    }

    public function testTermsCreatedByWriteExtrasCanBeDeletedAgain(): void
    {
        $role = new FieldDefinition('role', 'Funktion', 'string', 'pods', 'writable');
        $pods = Mockery::mock(FieldSource::class);
        $pods->allows('write')->andThrow(new RuntimeException('pods kaputt'));
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn(['role' => $role]);
        $schema->allows('sourceOf')->andReturn($pods);
        Functions\when('wp_insert_term')->justReturn(['term_id' => 15]);
        Functions\when('wp_set_object_terms')->justReturn([15]);
        $writer = new PostWriter($schema, new FieldValidator(), new TermAssigner());

        try {
            $writer->writeExtras(
                5,
                'lit_person',
                ['fields' => ['role' => 'x'], 'terms' => ['category' => ['Neu']], 'warnings' => []],
                []
            );
            self::fail('RuntimeException expected');
        } catch (RuntimeException $e) {
            self::assertSame('pods kaputt', $e->getMessage());
        }

        Functions\expect('wp_delete_term')->once()->with(15, 'category')->andReturn(true);
        $writer->deleteCreatedTerms();
        $writer->deleteCreatedTerms(); // nothing left – no second call
    }

    public function testRestoreTriesEveryStepAndReportsFailures(): void
    {
        $role = new FieldDefinition('role', 'Funktion', 'string', 'pods', 'writable');
        $pods = Mockery::mock(FieldSource::class);
        $pods->expects('write')->andThrow(new RuntimeException('pods kaputt'));
        $schema = Mockery::mock(ContentSchema::class);
        $schema->allows('fields')->andReturn(['role' => $role]);
        $schema->allows('sourceOf')->andReturn($pods);
        Functions\expect('wp_set_object_terms')->once()->andReturn([2]);
        Functions\expect('delete_post_thumbnail')->once()->andReturn(true);

        try {
            (new PostWriter($schema, new FieldValidator(), new TermAssigner()))->restore(
                5,
                'lit_person',
                ['fields' => ['role' => 'Alt'], 'terms' => ['category' => [2]], 'featured_image' => 0]
            );
            self::fail('RuntimeException expected');
        } catch (RuntimeException $e) {
            self::assertStringContainsString('pods kaputt', $e->getMessage());
        }
    }
}