<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Divi\ThemeBuilder;

use Brain\Monkey\Functions;
use LIT\MCP\Integrations\Divi\BlockTree\Block;
use LIT\MCP\Integrations\Divi\Compose\VariableRef;
use LIT\MCP\Integrations\Divi\BlockTree\NodeIndex;
use LIT\MCP\Integrations\Divi\BlockTree\Parser;
use LIT\MCP\Integrations\Divi\Pages\DiviChange;
use LIT\MCP\Integrations\Divi\Pages\DiviPage;
use LIT\MCP\Integrations\Divi\Pages\DynamicFields;
use LIT\MCP\Integrations\Divi\Pages\SaveScope;
use LIT\MCP\Integrations\Divi\Pages\VisibleEdits;
use LIT\MCP\Integrations\Divi\ThemeBuilder\Template;
use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderEdits;
use LIT\MCP\Abilities\Errors;
use LIT\MCP\Tests\Support\ThemeBuilderFixtures;
use LIT\MCP\Tests\Unit\Integrations\Divi\Pages\VisibleEditsTest;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use WP_Post;

final class ThemeBuilderEditsTest extends TestCase
{
    private int $backups = 0;

    private bool $trash = true;

    protected function setUp(): void
    {
        parent::setUp();
        Functions\when('wp_revisions_enabled')->justReturn(true);
        Functions\when('current_user_can')->justReturn(true);
    }

    private static function page(int $id, string $area): DiviPage
    {
        $post = ThemeBuilderFixtures::layout($id);
        $document = (new Parser())->parse((string) $post->post_content);

        return new DiviPage($post, $document, NodeIndex::build($document), false, $area);
    }

    /** @param list<Template> $templates */
    private static function edits(array $templates): ThemeBuilderEdits
    {
        return new ThemeBuilderEdits(ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store($templates)));
    }

    /**
     * With a recording backup (ID 1071) and the trash switch of $this->trash.
     *
     * @param list<Template> $templates
     */
    private function recording(array $templates): ThemeBuilderEdits
    {
        return new ThemeBuilderEdits(
            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store($templates)),
            new VisibleEdits(
                function (WP_Post $post): int {
                    ++$this->backups;

                    return 1071;
                },
                fn (): bool => $this->trash
            )
        );
    }

    public function testLiveLayoutNeedsConfirmAndNamesTheTemplates(): void
    {
        $edits = self::edits([ThemeBuilderFixtures::template(1066, ['enabled' => true])]);
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');

        $dry = $edits->prepare($page, []);
        self::assertToolError($dry, 'confirm_required');
        self::assertStringContainsString('sichtbar', self::clientError($dry)['message']);
        self::assertSame(
            [['id' => 1066, 'title' => '[Fixture] Vorlage Globale Instanzen', 'use_on' => ['singular:post_type:page:id:1053']]],
            $dry->get_error_data()['templates']
        );

        $confirmed = $edits->prepare($page, ['confirm' => true]);
        self::assertSame(SaveScope::ThemeBuilderLayout, $confirmed['scope']);
        self::assertCount(1, $confirmed['details']['templates']);
    }

    /** The global header: the default template shows it once it is enabled. */
    public function testTheDefaultTemplatesHeaderIsLiveWhenItIsEnabled(): void
    {
        $page = self::page(ThemeBuilderFixtures::HEADER, 'header');

        self::assertSame(['templates' => [], 'hidden' => 0], self::edits([ThemeBuilderFixtures::template(1065)])->showing($page));
        self::assertCount(
            1,
            self::edits([ThemeBuilderFixtures::template(1065, ['enabled' => true])])->showing($page)['templates']
        );
    }

    public function testLayoutsOfDisabledOrDetachedTemplatesSaveAtOnce(): void
    {
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $prepared = self::edits([
            ThemeBuilderFixtures::template(1066),
            ThemeBuilderFixtures::template(1067, ['enabled' => true, 'attached' => false]),
        ])->prepare($page, []);

        self::assertSame(SaveScope::ThemeBuilderLayout, $prepared['scope']);
        self::assertSame(['templates' => []], $prepared['details']);
    }

    /** Ruling Q8: attached and enabled is live, whatever the template's post status (fail closed). */
    public function testATrashedButEnabledTemplateStillNeedsConfirm(): void
    {
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $edits = self::edits([ThemeBuilderFixtures::template(1066, ['enabled' => true, 'status' => 'trash'])]);

        self::assertToolError($edits->prepare($page, []), 'confirm_required');
    }

    /**
     * Ruling Q22 (Q21 pattern): a live template the user may not edit is only counted – never its ID, title or
     * conditions – but still decides that confirm is needed.
     */
    public function testLiveTemplatesTheUserMayNotEditAreOnlyCounted(): void
    {
        Functions\when('current_user_can')->alias(static fn (string $cap, mixed $id = null): bool => $id !== 1067);
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $mine = ThemeBuilderFixtures::template(1066, ['enabled' => true]);
        $theirs = ThemeBuilderFixtures::template(1067, ['enabled' => true, 'title' => 'Geheim', 'use_on' => ['singular:post_type:page:id:4711']]);

        $dry = self::edits([$mine, $theirs])->prepare($page, []);

        self::assertToolError($dry, 'confirm_required');
        $data = $dry->get_error_data();
        self::assertSame([1066], array_column($data['templates'], 'id'));
        self::assertSame(1, $data['hidden_templates']);
        self::assertStringContainsString('2 aktive Vorlagen, davon 1 ohne Berechtigung', self::clientError($dry)['message']);
        $json = (string) json_encode($data) . self::clientError($dry)['message'];
        self::assertStringNotContainsString('1067', $json);
        self::assertStringNotContainsString('Geheim', $json);
        self::assertStringNotContainsString('4711', $json);
    }

    /** Ruling Q22: a layout shown only by templates the user may not edit still needs confirm (fail closed, F1/Q9). */
    public function testALayoutShownOnlyByHiddenTemplatesStillNeedsConfirm(): void
    {
        Functions\when('current_user_can')->alias(static fn (string $cap, mixed $id = null): bool => $id !== 1067);
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $edits = self::edits([ThemeBuilderFixtures::template(1067, ['enabled' => true])]);

        $dry = $edits->prepare($page, []);
        self::assertToolError($dry, 'confirm_required');
        self::assertSame([], $dry->get_error_data()['templates']);
        self::assertSame(1, $dry->get_error_data()['hidden_templates']);

        $confirmed = $edits->prepare($page, ['confirm' => true]);
        self::assertSame(SaveScope::ThemeBuilderLayout, $confirmed['scope']);
        self::assertSame(['templates' => [], 'hidden_templates' => 1], $confirmed['details']);

        $own = Errors::confirmRequired('3 Knoten löschen? Nichts wurde gelöscht.', ['ids' => ['s0']]);
        $merged = $edits->notice($page, $own);
        self::assertStringContainsString('sichtbar', self::clientError($merged)['message']);
        self::assertSame([], $merged->get_error_data()['templates']);
        self::assertSame(1, $merged->get_error_data()['hidden_templates']);
    }

    public function testNoticeExtendsAToolsOwnConfirm(): void
    {
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $own = Errors::confirmRequired('3 Knoten löschen? Nichts wurde gelöscht.', ['ids' => ['s0']]);

        $merged = self::edits([ThemeBuilderFixtures::template(1066, ['enabled' => true])])->notice($page, $own);

        self::assertToolError($merged, 'confirm_required');
        self::assertStringContainsString('3 Knoten löschen?', self::clientError($merged)['message']);
        self::assertStringContainsString('sichtbar', self::clientError($merged)['message']);
        self::assertSame(['s0'], $merged->get_error_data()['ids']);
        self::assertCount(1, $merged->get_error_data()['templates']);
        self::assertSame($own, self::edits([])->notice($page, $own));
    }

    /** Ruling Q2: a confirmed live edit gets a backup when revisions are off, like a global entry. */
    public function testWithoutRevisionsAConfirmedLiveEditMakesABackupFirst(): void
    {
        Functions\when('wp_revisions_enabled')->justReturn(false);
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $edits = $this->recording([ThemeBuilderFixtures::template(1066, ['enabled' => true])]);

        self::assertToolError($edits->prepare($page, []), 'confirm_required');
        self::assertSame(0, $this->backups, 'no backup in the dry run');

        $confirmed = $edits->prepare($page, ['confirm' => true]);
        self::assertSame(1071, $confirmed['details']['backup_id']);
        self::assertSame(1, $this->backups);
    }

    public function testWithRevisionsNoBackupIsMade(): void
    {
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $confirmed = $this->recording([ThemeBuilderFixtures::template(1066, ['enabled' => true])])
            ->prepare($page, ['confirm' => true]);

        self::assertArrayNotHasKey('backup_id', $confirmed['details']);
        self::assertSame(0, $this->backups);
    }

    /** A layout nobody sees needs no backup (like a plain library entry): the revision, if any, is enough. */
    public function testALayoutNobodySeesGetsNoBackup(): void
    {
        Functions\when('wp_revisions_enabled')->justReturn(false);
        $prepared = $this->recording([ThemeBuilderFixtures::template(1066)])
            ->prepare(self::page(ThemeBuilderFixtures::BODY, 'body'), []);

        self::assertSame(['templates' => []], $prepared['details']);
        self::assertSame(0, $this->backups);
    }

    /** Ruling P9 via Q2: the backup must be faithful (unfiltered_html) and must survive (trash). */
    public function testWithoutRevisionsUnfaithfulOrLostBackupsAreRefused(): void
    {
        Functions\when('wp_revisions_enabled')->justReturn(false);
        $page = self::page(ThemeBuilderFixtures::BODY, 'body');
        $live = [ThemeBuilderFixtures::template(1066, ['enabled' => true])];

        Functions\when('current_user_can')->alias(static fn (string $cap): bool => $cap !== 'unfiltered_html');
        $hint = 'Revisionen aktivieren (WP_POST_REVISIONS) oder das Layout im Divi Theme Builder bearbeiten.';
        $filtered = $this->recording($live)->prepare($page, ['confirm' => true]);
        self::assertToolError($filtered, 'unsupported');
        self::assertSame(sprintf(VisibleEditsTest::UNFAITHFUL, 'Theme-Builder-Layout 1062'), Errors::clientMessage($filtered));
        self::assertSame($hint, self::clientError($filtered)['hint']);

        Functions\when('current_user_can')->justReturn(true);
        $this->trash = false;
        $trash = $this->recording($live)->prepare($page, ['confirm' => true]);
        self::assertToolError($trash, 'unsupported');
        self::assertSame(sprintf(VisibleEditsTest::NO_TRASH, 'Theme-Builder-Layout 1062'), Errors::clientMessage($trash));
        self::assertSame($hint, self::clientError($trash)['hint']);

        self::assertSame(0, $this->backups);
    }

    /** @param array<string, mixed> $settings */
    private static function textWith(string $option, array $settings = ['before' => '', 'after' => '']): Block
    {
        return Block::create('divi/text', ['content' => ['innerContent' => ['desktop' => [
            'value' => VariableRef::serialize('content', $option, $settings),
        ]]]]);
    }

    /** Divi's dialog form of a Pods field (stage3b README finding 12, ruling Q11). */
    private static function dialogText(string $key): Block
    {
        return self::textWith('post_meta_key', [
            'before' => '',
            'after' => '',
            'select_meta_key' => 'custom_meta_' . $key,
            'meta_key' => '',
            'date_format' => 'default',
            'custom_date_format' => '',
            'enable_html' => 'off',
        ]);
    }

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

    private function fields(): DynamicFields
    {
        $fields = Mockery::mock(DynamicFields::class);
        $fields->allows('reason')->andReturnUsing(function (string $type, string $key): ?string {
            $this->asked[] = [$type, $key];

            return match ($key) {
                'role', 'level' => null,
                'mentor' => 'Beziehungs- oder Dateifeld – Divi zeigt davon nur IDs',
                default => 'kein bekanntes Feld dieses Inhaltstyps',
            };
        });
        $fields->allows('note')->andReturnUsing(static fn (string $type, string $key): ?string => $key === 'level'
            ? 'Auswahlfeld – Divi zeigt den gespeicherten Wert, nicht die Beschriftung'
            : null);

        return $fields;
    }

    /** @param list<Template> $templates */
    private function checking(array $templates): ThemeBuilderEdits
    {
        return new ThemeBuilderEdits(
            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store($templates)),
            fields: $this->fields()
        );
    }

    /** E12 / answer F4: fields are checked against the post types of the templates that use the body. */
    public function testFieldWarningsNameUnsuitableFieldsOfTheTemplatesPostTypes(): void
    {
        $edits = $this->checking([ThemeBuilderFixtures::template(1066, ['use_on' => ['singular:post_type:lit_person:all']])]);
        $change = (new DiviChange('2 Divi-Knoten eingefügt'))
            ->record(self::textWith('custom_meta_role'), 'inserted')
            ->record(self::textWith('custom_meta_mentor'), 'inserted');

        $warnings = $edits->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $change);

        self::assertCount(1, $warnings);
        self::assertStringContainsString('„mentor“', $warnings[0]);
        self::assertStringContainsString('lit_person: Beziehungs', $warnings[0]);
        self::assertSame([], $edits->fieldWarnings(self::page(ThemeBuilderFixtures::HEADER, 'header'), $change));
    }

    /** Ruling Q11: Divi's dialog form (post_meta_key + select_meta_key) is checked like custom_meta_<key>. */
    public function testTheDialogFormIsCheckedToo(): void
    {
        $edits = $this->checking([ThemeBuilderFixtures::template(1066, ['use_on' => ['singular:post_type:lit_person:all']])]);
        $change = (new DiviChange('x'))
            ->record(self::dialogText('role'), 'changed')
            ->record(self::dialogText('telefon'), 'changed');

        $warnings = $edits->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $change);

        self::assertCount(1, $warnings);
        self::assertStringContainsString('„telefon“', $warnings[0]);
        self::assertSame([['lit_person', 'role'], ['lit_person', 'telefon']], $this->asked);
    }

    /** Answer F4: a choice field shows its stored value – said once per field, with the post type. */
    public function testChoiceFieldsNameTheStoredValue(): void
    {
        $edits = $this->checking([ThemeBuilderFixtures::template(1066, ['use_on' => ['singular:post_type:lit_person:all']])]);
        $change = (new DiviChange('x'))->record(self::dialogText('level'), 'changed');

        $warnings = $edits->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $change);

        self::assertCount(1, $warnings);
        self::assertStringContainsString('„level“', $warnings[0]);
        self::assertStringContainsString('lit_person: Auswahlfeld – Divi zeigt den gespeicherten Wert', $warnings[0]);
    }

    public function testWithoutAPostTypeConditionTheFieldsAreUnchecked(): void
    {
        $edits = $this->checking([ThemeBuilderFixtures::template(1066, ['use_on' => ['homepage']])]);
        $change = (new DiviChange('x'))->record(self::textWith('custom_meta_role'), 'inserted');

        $warnings = $edits->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $change);

        self::assertCount(1, $warnings);
        self::assertStringContainsString('ungeprüft', $warnings[0]);
        self::assertSame([], $this->asked);
    }

    public function testNodesWithoutFieldsOrWithoutAFieldSourceGiveNoWarning(): void
    {
        $template = ThemeBuilderFixtures::template(1066, ['use_on' => ['singular:post_type:lit_person:all']]);
        $plain = (new DiviChange('x'))->record(self::textWith('post_title'), 'inserted');
        self::assertSame([], $this->checking([$template])->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $plain));

        $fields = (new DiviChange('x'))->record(self::textWith('custom_meta_telefon'), 'inserted');
        self::assertSame([], self::edits([$template])->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $fields));
    }

    /** Ruling Q21 pattern: templates the user may not edit are counted, never their post types. */
    public function testTemplatesTheUserMayNotEditLeakNoPostType(): void
    {
        Functions\when('current_user_can')->alias(static fn (string $cap, mixed $id = null): bool => $id !== 1067);
        $mine = ThemeBuilderFixtures::template(1066, ['use_on' => ['singular:post_type:lit_person:all']]);
        $theirs = ThemeBuilderFixtures::template(1067, ['use_on' => ['singular:post_type:geheim:all']]);
        $change = (new DiviChange('x'))->record(self::textWith('custom_meta_telefon'), 'inserted');

        $warnings = $this->checking([$mine, $theirs])->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $change);

        self::assertSame([['lit_person', 'telefon']], $this->asked);
        self::assertStringNotContainsString('geheim', implode(' ', $warnings));
        self::assertStringNotContainsString('1067', implode(' ', $warnings));
        self::assertStringContainsString('ohne Berechtigung', implode(' ', $warnings));

        $this->asked = [];
        $only = $this->checking([$theirs])->fieldWarnings(self::page(ThemeBuilderFixtures::BODY, 'body'), $change);
        self::assertSame([], $this->asked);
        self::assertCount(1, $only);
        self::assertStringContainsString('ungeprüft', $only[0]);
        self::assertStringContainsString('ohne Berechtigung', $only[0]);
        self::assertStringNotContainsString('geheim', $only[0]);
    }
}