<?php

declare(strict_types=1);

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

use InvalidArgumentException;
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\Unit\Integrations\Divi\Compose\ComposeFixture;
use LIT\MCP\Tests\Unit\Integrations\Divi\Design\DesignSystemTest;
use LIT\MCP\Tests\Unit\TestCase;
use RuntimeException;

final class DynamicContentMapTest extends TestCase
{
    /**
     * Shape of DynamicContentOptions::get_options($pageId, 'edit') in Divi 5.2.1 (excerpt of a
     * live dump for a page: no post_categories/post_tags – pages have no such taxonomies).
     *
     * @return array<string, array<string, mixed>>
     */
    public static function registry(): array
    {
        $text = static fn (): array => ['label' => 'x', 'type' => 'text', 'default' => ''];
        $option = static fn (string $id, string $group, array $fields): array => [
            'id' => $id, 'label' => $id, 'type' => 'text', 'custom' => false, 'group' => $group, 'fields' => $fields,
        ];

        return [
            'post_title' => $option('post_title', 'Default', ['before' => $text(), 'after' => $text()]),
            'post_excerpt' => $option('post_excerpt', 'Default', [
                'before' => $text(), 'after' => $text(), 'words' => $text(), 'read_more_label' => $text(),
            ]),
            'post_date' => $option('post_date', 'Default', [
                'before' => $text(),
                'after' => $text(),
                'date_format' => ['label' => 'x', 'type' => 'select', 'default' => 'default'],
                'custom_date_format' => $text(),
            ]),
            'post_author' => $option('post_author', 'Default', [
                'before' => $text(),
                'after' => $text(),
                'name_format' => ['type' => 'select'],
                'link' => ['type' => 'yes_no_button'],
            ]),
            'site_title' => $option('site_title', 'Default', ['before' => $text(), 'after' => $text()]),
            'post_link_url' => $option('post_link_url', 'Default', []),
            'post_link_url_page' => $option('post_link_url_page', 'Default', ['post_id' => ['type' => 'select_post']]),
            'post_featured_image' => $option('post_featured_image', 'Default', []),
            'post_meta_key' => $option('post_meta_key', 'Standard', [
                'before' => $text(),
                'after' => $text(),
                'select_meta_key' => ['type' => 'select'],
                'meta_key' => $text(),
                'enable_html' => ['type' => 'yes_no_button'],
            ]),
            'loop_post_title' => $option('loop_post_title', 'Loop', [
                'before' => $text(), 'after' => $text(), 'loop_position' => $text(),
            ]),
            'loop_post_meta_key_manual_custom_field' => $option('loop_post_meta_key_manual_custom_field', 'Loop', [
                'loop_meta_key' => $text(),
            ]),
            // Odd entries a third-party filter could add.
            'broken_fields' => $option('broken_fields', 'Default', ['a' => 'not-an-array', 'b' => ['type' => 3]]),
            'no_fields' => ['id' => 'no_fields', 'type' => 'text'],
            7 => $option('7', 'Default', []),
            'not_an_array' => 'x',
        ];
    }

    public function testFlattensTheRegistryToOptionNameAndFieldTypes(): void
    {
        $map = DynamicContentMap::fromOptions(self::registry());

        // 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(self::registry());

        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(self::registry());

        foreach (Placeholders::POST as $option) {
            self::assertArrayHasKey($option, $map, $option);
            foreach (array_keys(VariableRef::DEFAULT_DYNAMIC_CONTENT[$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(DesignSystemTest::sample(), $map);
        foreach (array_keys(Placeholders::POST) as $key) {
            $reference = $placeholders->resolve('{{post:' . $key . '}}');
            self::assertSame(
                $reference,
                $placeholders->references()->canonical($reference, ComposeFixture::sanitizer()),
                $key
            );
        }
    }

    public function testTheMapWorksInVariableRef(): void
    {
        $references = new VariableRef(DesignSystemTest::sample(), DynamicContentMap::fromOptions(self::registry()));
        $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 DynamicContentMapTest::registry();
        }))->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));
    }

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