<?php

declare(strict_types=1);

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

use InvalidArgumentException;
use LIT\MCP\Integrations\Divi\Compose\DynamicContentRules;
use LIT\MCP\Integrations\Divi\Compose\LoopScope;
use LIT\MCP\Integrations\Divi\Compose\Placeholders;
use LIT\MCP\Integrations\Divi\Compose\VariableRef;
use LIT\MCP\Integrations\Divi\Pages\DynamicContentMap;
use LIT\MCP\Tests\Support\ComposeFixture;
use LIT\MCP\Tests\Support\DiviFixtures;
use LIT\MCP\Tests\Unit\TestCase;
use RuntimeException;

final class DynamicContentMapTest extends TestCase
{
    public function testFlattensTheRegistryToOptionNameAndFieldTypes(): void
    {
        $map = DynamicContentMap::fromOptions(DiviFixtures::dynamicContentRegistry());

        // before/after: rich text (Divi outputs them as HTML; text() would trim "Von ").
        self::assertSame(['before' => 'richtext', 'after' => 'richtext'], $map['post_title']);
        self::assertSame(
            ['before' => 'richtext', 'after' => 'richtext', 'date_format' => 'select', 'custom_date_format' => 'text'],
            $map['post_date']
        );
        self::assertSame(['post_id' => 'select_post'], $map['post_link_url_page']);
        self::assertSame([], $map['post_link_url']);
        self::assertSame('select', $map['post_meta_key']['select_meta_key']);
        // Fields without a readable type become '' – VariableRef's strictest branch (scalar, no markup).
        self::assertSame(['a' => '', 'b' => ''], $map['broken_fields']);
        self::assertSame([], $map['no_fields']);
        self::assertArrayNotHasKey('not_an_array', $map);
        self::assertArrayNotHasKey(7, $map);
    }

    public function testLoopOptionsNeverEnterTheMap(): void
    {
        $map = DynamicContentMap::fromOptions(DiviFixtures::dynamicContentRegistry());

        self::assertSame([], array_filter(array_keys($map), static fn (string $name): bool => str_starts_with($name, 'loop_')));
    }

    public function testPlaceholderOptionsAreAlwaysThere(): void
    {
        // The map replaces VariableRef's default: every {{post:…}} placeholder must stay usable
        // with the settings it writes (before/after), also where the registry lacks the option.
        $map = DynamicContentMap::fromOptions(DiviFixtures::dynamicContentRegistry());

        foreach (Placeholders::POST as $option) {
            self::assertArrayHasKey($option, $map, $option);
            foreach (array_keys(DynamicContentRules::DEFAULT_DYNAMIC_CONTENT[$option]) as $setting) {
                self::assertArrayHasKey($setting, $map[$option], "$option.$setting");
            }
        }
        // Supplemented with the default settings.
        self::assertSame(['before' => 'richtext', 'after' => 'richtext'], $map['post_categories']);
        // Live fields win.
        self::assertSame('select', $map['post_date']['date_format']);
        self::assertSame('text', $map['post_excerpt']['words']);

        $placeholders = new Placeholders(DiviFixtures::designSystem());
        $references = new VariableRef(DiviFixtures::designSystem(), $map);
        foreach (array_keys(Placeholders::POST) as $key) {
            $reference = $placeholders->resolve('{{post:' . $key . '}}');
            self::assertSame(
                $reference,
                $references->canonical($reference, ComposeFixture::sanitizer()),
                $key
            );
        }
    }

    public function testTheMapWorksInVariableRef(): void
    {
        $references = new VariableRef(DiviFixtures::designSystem(), DynamicContentMap::fromOptions(DiviFixtures::dynamicContentRegistry()));
        $sanitizer = ComposeFixture::sanitizer();
        $ref = static fn (string $name, array $settings): string => VariableRef::serialize('content', $name, $settings);

        // An option only the live registry knows.
        $site = $ref('site_title', ['before' => 'Willkommen bei ', 'after' => '']);
        self::assertSame($site, $references->canonical($site, $sanitizer));
        // before/after are cleaned as rich text (kses for editors) and re-serialized; spaces stay.
        self::assertSame(
            $ref('post_title', ['before' => 'Neu: ', 'after' => '']),
            $references->canonical($ref('post_title', ['before' => '<script>x()</script>Neu: ', 'after' => '']), $sanitizer)
        );
        // Other text fields go through text().
        self::assertSame(
            $ref('post_excerpt', ['words' => '20']),
            $references->canonical($ref('post_excerpt', ['words' => '<b>20</b>']), $sanitizer)
        );
        // Meta keys still obey S29/S30, also through the live map.
        $meta = $ref('post_meta_key', ['select_meta_key' => 'custom_meta__wp_page_template']);
        self::assertRejected(static fn () => $references->canonical($meta, $sanitizer), 'Meta-Schlüssel');
        $ok = $ref('post_meta_key', ['meta_key' => 'telefon']);
        self::assertSame($ok, $references->canonical($ok, $sanitizer));
        // enable_html stays forbidden even though the registry lists it.
        $html = $ref('post_meta_key', ['enable_html' => 'on']);
        self::assertRejected(static fn () => $references->canonical($html, $sanitizer), 'enable_html');
        // Loop content: Divi offers it only inside loops – never through the tools.
        $loop = $ref('loop_post_title', []);
        self::assertRejected(static fn () => $references->canonical($loop, $sanitizer), 'Schleifen');
    }

    public function testLiveRegistryForThePost(): void
    {
        $seen = [];
        $map = (new DynamicContentMap(static function (int $postId) use (&$seen): array {
            $seen[] = $postId;

            return DiviFixtures::dynamicContentRegistry();
        }))->forPost(42);

        self::assertSame([42], $seen);
        self::assertSame(['before' => 'richtext', 'after' => 'richtext'], $map['site_title'] ?? null);
    }

    public function testUnavailableRegistryFallsBackToTheDefault(): void
    {
        self::assertNull((new DynamicContentMap(static fn (): array => []))->forPost(7), 'empty (recursion guard)');
        self::assertNull((new DynamicContentMap(static fn (): string => 'x'))->forPost(7), 'no array');

        $log = (string) tempnam(sys_get_temp_dir(), 'lit-log');
        $previous = ini_set('error_log', $log);
        try {
            $map = (new DynamicContentMap(static function (): array {
                throw new RuntimeException('filter exploded');
            }))->forPost(7);
        } finally {
            ini_set('error_log', (string) $previous);
        }
        self::assertNull($map);
        self::assertStringContainsString('filter exploded', (string) file_get_contents($log));
        // The message only – no stack trace in the log (review M-4).
        self::assertStringNotContainsString('#0 ', (string) file_get_contents($log));
        self::assertStringNotContainsString('RuntimeException', (string) file_get_contents($log));
        unlink($log);

        // Without Divi (no DynamicContentOptions class, as in these unit tests).
        self::assertNull((new DynamicContentMap())->forPost(7));
    }

    public function testOptionsCarryLabelGroupAndSettingTypesWithoutLoops(): void
    {
        $map = new DynamicContentMap(static fn (int $id): array => DiviFixtures::dynamicContentRegistry());

        $options = $map->options(831);

        self::assertSame(['post_id' => 'select_post'], $options['post_link_url_page']['settings']);
        self::assertSame('post_meta_key', $options['post_meta_key']['label']);
        self::assertSame('Standard', $options['post_meta_key']['group']);
        self::assertArrayNotHasKey('loop_post_title', $options);
        self::assertNull((new DynamicContentMap(static fn (int $id): array => []))->options(831));
    }

    public function testOptionsUseTheSameNamesAndTypesAsTheAllowMap(): void
    {
        $map = new DynamicContentMap(static fn (int $id): array => DiviFixtures::dynamicContentRegistry());

        $options = $map->options(831);

        self::assertSame(array_keys((array) $map->forPost(831)), array_keys((array) $options));
        $settings = array_map(static fn (array $option): array => $option['settings'], (array) $options);
        self::assertSame($map->forPost(831), $settings);
        // Placeholder options the registry lacks: name as label, no group.
        self::assertSame(['label' => 'post_tags', 'group' => ''], array_slice($options['post_tags'], 0, 2));
    }

    public function testOptionsNeverNameProtectedMetaKeys(): void
    {
        // A third-party filter may register per-key options (D4 style custom_meta_<key>).
        $registry = DiviFixtures::dynamicContentRegistry() + [
            'custom_meta__edit_lock' => ['label' => '_edit_lock', 'group' => 'Custom', 'fields' => []],
            'custom_meta_custom_meta__secret' => ['label' => 'x', 'group' => 'Custom', 'fields' => []],
            'custom_meta_telefon' => ['label' => 'Telefon', 'group' => 'Custom', 'fields' => []],
        ];
        $map = new DynamicContentMap(static fn (int $id): array => $registry);

        $options = (array) $map->options(831);

        self::assertArrayNotHasKey('custom_meta__edit_lock', $options);
        self::assertArrayNotHasKey('custom_meta_custom_meta__secret', $options);
        self::assertSame('Telefon', $options['custom_meta_telefon']['label']);
        // The allow map itself is unchanged: VariableRef refuses those names by its own rules (S12/S30).
        self::assertArrayHasKey('custom_meta__edit_lock', (array) $map->forPost(831));
    }

    public function testTheAllowMapIsUnchangedByTheRawLookupRefactor(): void
    {
        // Snapshot of forPost() for the live-like registry, taken before forPost() moved onto raw()
        // (Task 15): the security allow map must stay exactly the same (rulings S22/S29/S30/S37).
        $before = '{"post_title":{"before":"richtext","after":"richtext"},"post_excerpt":{"before":"richtext",'
            . '"after":"richtext","words":"text","read_more_label":"text"},"post_date":{"before":"richtext",'
            . '"after":"richtext","date_format":"select","custom_date_format":"text"},"post_author":{"before":'
            . '"richtext","after":"richtext","name_format":"select","link":"yes_no_button"},"site_title":{"before":'
            . '"richtext","after":"richtext"},"post_link_url":[],"post_link_url_page":{"post_id":"select_post"},'
            . '"post_featured_image":[],"post_meta_key":{"before":"richtext","after":"richtext","select_meta_key":'
            . '"select","meta_key":"text","enable_html":"yes_no_button"},"broken_fields":{"a":"","b":""},'
            . '"no_fields":[],"post_modified_date":{"before":"richtext","after":"richtext","date_format":"select",'
            . '"custom_date_format":"text"},"post_categories":{"before":"richtext","after":"richtext"},'
            . '"post_tags":{"before":"richtext","after":"richtext"}}';

        $map = new DynamicContentMap(static fn (int $id): array => DiviFixtures::dynamicContentRegistry());
        $after = $map->forPost(831);

        self::assertSame(json_decode($before, true), $after);
        self::assertSame($before, json_encode($after));
    }

    /** Ruling X2: loop_* options stay, grouped by kind – by group, the three meta options by name. */
    public function testLoopFieldsGroupTheLoopOptionsByKind(): void
    {
        $map = new DynamicContentMap(static fn (int $id): array => DiviFixtures::dynamicContentRegistry());

        self::assertSame(
            [
                'loop_post_title', 'loop_post_date', 'loop_post_featured_image',
                'loop_post_meta_key_manual_custom_field', 'loop_product_title',
            ],
            array_keys($map->loopFields(LoopScope::POST))
        );
        self::assertSame(
            ['loop_term_name', 'loop_term_meta_key_manual_custom_field'],
            array_keys($map->loopFields(LoopScope::TERM))
        );
        self::assertSame(
            ['loop_user_name', 'loop_user_meta_key_manual_custom_field'],
            array_keys($map->loopFields(LoopScope::USER))
        );
        self::assertSame(['loop_menu_text'], array_keys($map->loopFields(LoopScope::MENU)));
        // ACF repeater rows have no kind (X2/X7e); an unknown kind has no options.
        self::assertSame([], $map->loopFields('repeater_team'));
        self::assertSame([], $map->loopFields(''));
    }

    public function testLoopFieldsHaveTheShapeOfTheAllowMap(): void
    {
        $map = new DynamicContentMap(static fn (int $id): array => DiviFixtures::dynamicContentRegistry());

        $post = $map->loopFields(LoopScope::POST);

        self::assertSame(
            [
                'before' => 'richtext', 'after' => 'richtext', 'loop_position' => 'text',
                'date_format' => 'select', 'custom_date_format' => 'text',
            ],
            $post['loop_post_date']
        );
        self::assertSame(['loop_position' => 'text', 'thumbnail_size' => 'select'], $post['loop_post_featured_image']);
        self::assertSame(
            ['select', 'text', 'yes_no_button'],
            [
                $post['loop_post_meta_key_manual_custom_field']['select_loop_meta_key'],
                $post['loop_post_meta_key_manual_custom_field']['loop_meta_key'],
                $post['loop_post_meta_key_manual_custom_field']['enable_html'],
            ]
        );
    }

    /** The custom field groups are translated ("Loop %s Custom Fields", esc_html__) – their name decides. */
    public function testTheMetaOptionsFollowTheirNameNotTheirGroup(): void
    {
        $registry = DiviFixtures::dynamicContentRegistry();
        $registry['loop_user_meta_key_manual_custom_field']['group'] = 'Schleife: Benutzer-Felder';
        $registry['loop_term_meta_key_manual_custom_field']['group'] = 'Loop';
        $registry['loop_post_meta_key_manual_custom_field']['group'] = 'Loop Users';
        $map = new DynamicContentMap(static fn (int $id): array => $registry);

        self::assertArrayHasKey('loop_user_meta_key_manual_custom_field', $map->loopFields(LoopScope::USER));
        self::assertArrayHasKey('loop_term_meta_key_manual_custom_field', $map->loopFields(LoopScope::TERM));
        self::assertArrayHasKey('loop_post_meta_key_manual_custom_field', $map->loopFields(LoopScope::POST));
        self::assertArrayNotHasKey('loop_post_meta_key_manual_custom_field', $map->loopFields(LoopScope::USER));
    }

    public function testLoopFieldsReadTheRegistryOfThePostAndAreEmptyWithoutIt(): void
    {
        $seen = [];
        $map = new DynamicContentMap(static function (int $postId) use (&$seen): array {
            $seen[] = $postId;

            return DiviFixtures::dynamicContentRegistry();
        });

        $map->loopFields(LoopScope::POST, 42);
        $map->loopFields(LoopScope::TERM);

        self::assertSame([42, 0], $seen);
        self::assertSame([], (new DynamicContentMap(static fn (): array => []))->loopFields(LoopScope::POST));
        self::assertSame([], (new DynamicContentMap())->loopFields(LoopScope::POST), 'without Divi');
    }

    private static function assertRejected(callable $call, string $fragment): void
    {
        try {
            $call();
            self::fail('InvalidArgumentException expected');
        } catch (InvalidArgumentException $e) {
            self::assertStringContainsString($fragment, $e->getMessage());
        }
    }
}