<?php

declare(strict_types=1);

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

use Brain\Monkey\Functions;
use LIT\MCP\Abilities\WriteFailed;
use LIT\MCP\Integrations\Divi\ThemeBuilder\DiviThemeBuilder;
use LIT\MCP\Integrations\Divi\ThemeBuilder\TbAssignAbility;
use LIT\MCP\Integrations\Divi\ThemeBuilder\Template;
use LIT\MCP\Integrations\Divi\ThemeBuilder\TemplateConditions;
use LIT\MCP\Tests\Support\DiviWriterFixture;
use LIT\MCP\Tests\Support\FakeChangeLog;
use LIT\MCP\Tests\Support\LibraryFixtures;
use LIT\MCP\Tests\Support\ThemeBuilderFixtures;
use LIT\MCP\Tests\Unit\TestCase;
use RuntimeException;

final class TbAssignAbilityTest extends TestCase
{
    private const PERSONS = 'singular:post_type:lit_person:all';

    protected function setUp(): void
    {
        parent::setUp();
        self::givenPosts();
        Functions\when('admin_url')->alias(static fn (string $path): string => 'https://kunde.test/wp-admin/' . $path);
    }

    /** @param array<string, mixed> $bodyFields */
    private static function givenPosts(array $bodyFields = []): void
    {
        LibraryFixtures::given([
            ThemeBuilderFixtures::templatePost(1066),
            ThemeBuilderFixtures::templatePost(1065),
            ThemeBuilderFixtures::layout(1061),
            ThemeBuilderFixtures::layout(1062, $bodyFields),
            ThemeBuilderFixtures::layout(1063),
        ]);
    }

    private static function ability(DiviThemeBuilder $store, ?FakeChangeLog $log = null): TbAssignAbility
    {
        return new TbAssignAbility(
            ThemeBuilderFixtures::access([], true, $store),
            new TemplateConditions($store),
            $log ?? DiviWriterFixture::log()
        );
    }

    /** @return array<string, mixed> */
    private static function input(Template $template, array $extra = []): array
    {
        return array_merge(
            ['template_id' => $template->id, 'template_rev' => $template->rev(), 'use_on' => [self::PERSONS]],
            $extra
        );
    }

    public function testSetsConditionsOfADisabledTemplateAtOnce(): void
    {
        $template = ThemeBuilderFixtures::template(1066);
        $store = ThemeBuilderFixtures::store([ThemeBuilderFixtures::template(1065), $template]);
        $store->shouldReceive('setConditions')->once()->with(1066, [self::PERSONS], []);
        $store->shouldReceive('clearCaches')->never();

        $result = self::ability($store)->execute(self::input($template));

        self::assertTrue($result['ok']);
        self::assertFalse($result['live']);
        self::assertSame(['use_on' => ['singular:post_type:page:id:1053'], 'exclude_from' => []], $result['previous']);
        self::assertStringContainsString('ohne Wirkung auf die Website', $result['summary']);
    }

    /** Ruling Q9/B22: live → dry run + confirm; ruling Q3/B3: the dry run shows both lists before and after. */
    public function testActiveTemplateNeedsConfirm(): void
    {
        $template = ThemeBuilderFixtures::template(1066, ['enabled' => true]);
        $other = ThemeBuilderFixtures::template(1070, ['enabled' => true, 'title' => 'Personen alt', 'use_on' => [self::PERSONS]]);
        $store = ThemeBuilderFixtures::store([$template, $other]);
        $calls = 0;
        $store->shouldReceive('setConditions')->andReturnUsing(static function () use (&$calls): void {
            ++$calls;
        });
        $store->shouldReceive('clearCaches')->once();

        $dry = self::ability($store)->execute(self::input($template));
        self::assertToolError($dry, 'confirm_required');
        self::assertSame(0, $calls);
        self::assertSame(['use_on' => ['Bestimmte Seiten: 1053'], 'exclude_from' => []], $dry->get_error_data()['before']);
        self::assertSame(['use_on' => ['Alle Personen'], 'exclude_from' => []], $dry->get_error_data()['after']);
        self::assertSame(
            [['id' => 1070, 'title' => 'Personen alt', 'conditions' => [self::PERSONS]]],
            $dry->get_error_data()['overlaps']
        );

        $result = self::ability($store)->execute(self::input($template, ['confirm' => true]));
        self::assertTrue($result['ok']);
        self::assertTrue($result['live']);
        self::assertStringContainsString('wirkt sofort', $result['summary']);
        self::assertSame(1, $calls);
    }

    /** Ruling Q3/B3: an omitted exclude_from stays as it is; an explicit [] clears it – shown in the dry run. */
    public function testOmittedExcludeFromStaysAndAnEmptyListClearsIt(): void
    {
        $template = ThemeBuilderFixtures::template(1066, ['exclude_from' => ['singular:post_type:page:id:1054']]);
        $store = ThemeBuilderFixtures::store([$template]);
        $written = [];
        $store->shouldReceive('setConditions')->andReturnUsing(
            static function (int $id, array $useOn, array $excludeFrom) use (&$written): void {
                $written[] = $excludeFrom;
            }
        );

        self::ability($store)->execute(self::input($template));
        self::ability($store)->execute(self::input($template, ['exclude_from' => []]));
        self::ability($store)->execute(self::input($template, ['exclude_from' => ['homepage']]));

        self::assertSame([['singular:post_type:page:id:1054'], [], ['homepage']], $written);

        $live = ThemeBuilderFixtures::template(1066, ['enabled' => true, 'exclude_from' => ['singular:post_type:page:id:1054']]);
        $dry = self::ability(ThemeBuilderFixtures::store([$live]))->execute(self::input($live, ['exclude_from' => []]));
        self::assertToolError($dry, 'confirm_required');
        self::assertSame(['Bestimmte Seiten: 1054'], $dry->get_error_data()['before']['exclude_from']);
        self::assertSame([], $dry->get_error_data()['after']['exclude_from']);
        self::assertStringContainsString('Ausnahmen', self::clientError($dry)['message']);
    }

    /** Ruling Q8/B9: other live templates of the same family are named as possible overlaps. */
    public function testDryRunNamesPossibleOverlaps(): void
    {
        $template = ThemeBuilderFixtures::template(1066, ['enabled' => true]);
        $pages = ThemeBuilderFixtures::template(1070, [
            'enabled' => true,
            'title' => 'Alle Seiten',
            'use_on' => ['singular:post_type:page:all'],
        ]);
        $store = ThemeBuilderFixtures::store([$template, $pages]);

        $dry = self::ability($store)->execute(self::input($template, ['use_on' => ['homepage']]));

        self::assertSame([], $dry->get_error_data()['overlaps']);
        self::assertSame(
            [['id' => 1070, 'title' => 'Alle Seiten', 'conditions' => ['singular:post_type:page:all']]],
            $dry->get_error_data()['possible_overlaps']
        );
    }

    public function testReattachKeepsTheTemplateDisabledAndUnmarksItsLayouts(): void
    {
        $detached = ThemeBuilderFixtures::template(1066, [
            'enabled' => true,
            'attached' => false,
            'marked_unused' => '2026-09-20 08:00:00',
        ]);
        $store = ThemeBuilderFixtures::store([ThemeBuilderFixtures::template(1065)], 0, [$detached]);

        $refused = self::ability($store)->execute(self::input($detached));
        self::assertToolError($refused, 'validation_failed');
        self::assertArrayHasKey('reattach', self::errorFields($refused));
        self::assertStringContainsString('2026-09-20', self::clientError($refused)['message']);

        $store->shouldReceive('setEnabled')->once()->with(1066, false);
        $store->shouldReceive('attach')->once()->with(1064, 1066);
        $unmarked = [];
        $store->shouldReceive('unmarkUnused')->andReturnUsing(static function (int $id) use (&$unmarked): void {
            $unmarked[] = $id;
        });
        $store->shouldReceive('setConditions')->once()->with(1066, [self::PERSONS], []);

        $log = DiviWriterFixture::log();
        $result = self::ability($store, $log)->execute(self::input($detached, ['reattach' => true]));

        self::assertTrue($result['ok']);
        self::assertSame([1066, 1061, 1062, 1063], $unmarked);
        self::assertStringContainsString('wieder zugeordnet', $log->summaries()[0]);
    }

    /** Ruling Q8/B10: a layout Divi trashed meanwhile blocks the reattach; nothing is written. */
    public function testReattachNeedsPublishedLayouts(): void
    {
        self::givenPosts(['post_status' => 'trash']);
        $detached = ThemeBuilderFixtures::template(1066, ['attached' => false]);
        $store = ThemeBuilderFixtures::store([], 0, [$detached]);
        foreach (['setEnabled', 'attach', 'unmarkUnused', 'setConditions'] as $method) {
            $store->shouldReceive($method)->never();
        }

        $refused = self::ability($store, FakeChangeLog::forbidden())->execute(self::input($detached, ['reattach' => true]));

        self::assertToolError($refused, 'validation_failed');
        self::assertSame(['layouts.body'], array_keys(self::errorFields($refused)));
    }

    public function testFailedReattachDetachesAndRestoresTheFlag(): void
    {
        $detached = ThemeBuilderFixtures::template(1066, ['enabled' => true, 'attached' => false]);
        $store = ThemeBuilderFixtures::store([], 0, [$detached]);
        $steps = [];
        $store->shouldReceive('setEnabled')->andReturnUsing(static function (int $id, bool $on) use (&$steps): void {
            $steps[] = 'enabled:' . ($on ? '1' : '0');
        });
        $store->shouldReceive('attach')->andReturnUsing(static function () use (&$steps): void {
            $steps[] = 'attach';
        });
        $store->shouldReceive('unmarkUnused');
        $store->shouldReceive('setConditions')->andReturnUsing(static function (int $id, array $useOn) use (&$steps): void {
            $steps[] = 'conditions:' . implode(',', $useOn);
            if ($useOn === [self::PERSONS]) {
                throw new RuntimeException('add_post_meta failed');
            }
        });
        $store->shouldReceive('detach')->once()->with(1064, 1066)->andReturnUsing(static function () use (&$steps): void {
            $steps[] = 'detach';
        });

        try {
            self::ability($store, FakeChangeLog::forbidden())->execute(self::input($detached, ['reattach' => true]));
            self::fail('no WriteFailed');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
        }
        self::assertSame(
            ['enabled:0', 'attach', 'conditions:' . self::PERSONS, 'conditions:singular:post_type:page:id:1053', 'detach', 'enabled:1'],
            $steps
        );
    }

    public function testFailureRestoresThePreviousConditions(): void
    {
        $template = ThemeBuilderFixtures::template(1066);
        $store = ThemeBuilderFixtures::store([$template]);
        $calls = [];
        $store->shouldReceive('setConditions')->andReturnUsing(static function (int $id, array $useOn) use (&$calls): void {
            $calls[] = $useOn;
            if (count($calls) === 1) {
                throw new RuntimeException('add_post_meta failed');
            }
        });

        try {
            self::ability($store, FakeChangeLog::forbidden())->execute(self::input($template));
            self::fail('no WriteFailed');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
        }
        self::assertSame([[self::PERSONS], ['singular:post_type:page:id:1053']], $calls);
    }

    public function testFailedRestoreIsAPartialWrite(): void
    {
        $template = ThemeBuilderFixtures::template(1066);
        $store = ThemeBuilderFixtures::store([$template]);
        $store->shouldReceive('setConditions')->andThrow(new RuntimeException('database gone'));
        $log = FakeChangeLog::partialsOnly();

        try {
            self::ability($store, $log)->execute(self::input($template));
            self::fail('no WriteFailed');
        } catch (WriteFailed $e) {
            self::assertFalse($e->rolledBack);
        }
        $log->assertPartials(['ability' => 'lit/tb-assign', 'object_type' => 'et_template', 'object_id' => '1066']);
    }

    public function testChangeLogKeepsThePreviousConditions(): void
    {
        $template = ThemeBuilderFixtures::template(1066, ['exclude_from' => ['homepage']]);
        $store = ThemeBuilderFixtures::store([$template]);
        $store->shouldReceive('setConditions');
        $log = DiviWriterFixture::log();

        $result = self::ability($store, $log)->execute(self::input($template));

        self::assertStringContainsString('singular:post_type:page:id:1053', $log->summaries()[0]);
        self::assertStringContainsString('homepage', $log->summaries()[0]);
        self::assertSame(['use_on' => ['singular:post_type:page:id:1053'], 'exclude_from' => ['homepage']], $result['previous']);
    }

    public function testInvalidConditionsAndMissingUseOnWriteNothing(): void
    {
        $template = ThemeBuilderFixtures::template(1066);
        $store = ThemeBuilderFixtures::store([$template]);
        $store->shouldReceive('setConditions')->never();

        self::assertToolError(self::ability($store)->execute(self::input($template, ['use_on' => ['erfunden']])), 'validation_failed');
        self::assertToolError(
            self::ability($store)->execute(self::input($template, ['exclude_from' => ['erfunden']])),
            'validation_failed'
        );
        $noList = self::input($template);
        unset($noList['use_on']);
        self::assertToolError(self::ability($store)->execute($noList), 'validation_failed');
        self::assertTrue(self::ability($store)->annotations()['destructive']);
        self::assertFalse(self::ability($store)->isDirect());
    }

    public function testPermissionUsesTheSameGate(): void
    {
        $template = ThemeBuilderFixtures::template(1066);
        $store = ThemeBuilderFixtures::store([$template]);

        self::assertTrue(self::ability($store)->permission(self::input($template)));
        self::assertToolError(self::ability($store)->permission(self::input($template, ['template_rev' => 'x'])), 'rev_mismatch');
        self::assertToolError(self::ability($store)->permission(self::input($template, ['template_id' => 4711])), 'not_found');
    }
}