<?php

declare(strict_types=1);

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

use InvalidArgumentException;
use LIT\MCP\Integrations\Divi\Compose\AttrWriter;
use LIT\MCP\Integrations\Divi\Compose\ValueCleaner;
use LIT\MCP\Integrations\Divi\Schema\ModuleCatalog;
use LIT\MCP\Tests\Support\ComposeFixture;
use LIT\MCP\Tests\Support\DiviFixtures;
use PHPUnit\Framework\TestCase;

final class AttrWriterTest extends TestCase
{
    private const HEADING = [
        'title' => [
            'innerContent' => ['desktop' => ['value' => 'Alt']],
            'decoration' => ['font' => ['font' => [
                'desktop' => ['value' => ['headingLevel' => 'h2', 'color' => '#111111']],
                'phone' => ['value' => ['size' => '22px']],
            ]]],
        ],
        'builderVersion' => '5.2.1',
    ];

    private const TEXT = [
        'content' => ['innerContent' => ['desktop' => ['value' => '<p>Alt</p>']]],
        'builderVersion' => '5.2.1',
    ];

    public function testMergesShortAndRawBreakpointsAndKeepsTheRest(): void
    {
        $result = ComposeFixture::attrWriter()->apply('divi/heading', self::HEADING, [
            'title.decoration.font.font' => [
                'desktop' => ['value' => ['headingLevel' => 'h3'], 'hover' => ['color' => '{{color:primary}}']],
                'tablet' => ['size' => '26px'],
            ],
            'title.innerContent' => ['desktop' => '<b>Neu</b>'],
        ], 'attrs');

        self::assertSame([], $result['errors']);
        self::assertSame(
            [
                'desktop' => [
                    'value' => ['headingLevel' => 'h3'],
                    'hover' => ['color' => '$variable({"type":"color","value":{"name":"gcid-primary-color","settings":{}}})$'],
                ],
                'phone' => ['value' => ['size' => '22px']],
                'tablet' => ['value' => ['size' => '26px']],
            ],
            $result['attrs']['title']['decoration']['font']['font']
        );
        // Heading title is kind "text" in the catalog (ruling S3): tags are stripped.
        self::assertSame('Neu', $result['attrs']['title']['innerContent']['desktop']['value']);
        self::assertSame('5.2.1', $result['attrs']['builderVersion']);
    }

    public function testNullRemovesPathsAndStatesAndTopLevelHoverMeansDesktop(): void
    {
        $writer = ComposeFixture::attrWriter();

        $removed = $writer->apply('divi/heading', self::HEADING, ['title.decoration.font.font' => null], 'attrs');
        self::assertArrayNotHasKey('decoration', $removed['attrs']['title']);

        $phoneGone = $writer->apply('divi/heading', self::HEADING, [
            'title.decoration.font.font' => ['phone' => ['value' => null], 'hover' => ['color' => '#000000']],
        ], 'attrs');
        self::assertSame(
            ['desktop' => ['value' => ['headingLevel' => 'h2', 'color' => '#111111'], 'hover' => ['color' => '#000000']]],
            $phoneGone['attrs']['title']['decoration']['font']['font']
        );
    }

    public function testUnknownPathsGetSuggestions(): void
    {
        $result = ComposeFixture::attrWriter()->apply('divi/heading', self::HEADING, [
            'title.decoration.font' => ['desktop' => ['color' => '#fff']],
            'title.innerContent' => ['mobile' => 'x'],
        ], 'changes[0].attrs');

        self::assertSame(['title.decoration.font'], $result['invalid_paths']);
        self::assertStringContainsString(
            'title.decoration.font.font',
            $result['errors']['changes[0].attrs.title.decoration.font']
        );
        self::assertStringContainsString('unbekannter Breakpoint "mobile"', $result['errors']['changes[0].attrs.title.innerContent']);
        self::assertSame(self::HEADING, $result['attrs']);
    }

    public function testSanitizesByPlace(): void
    {
        $cleaner = ComposeFixture::cleaner();

        self::assertSame('', $cleaner->clean('divi/button', 'button.innerContent', 'javascript:alert(1)', 'linkUrl'));
        self::assertSame('<p>x</p>', $cleaner->clean('divi/text', 'content.innerContent', '<p>x</p><script>y</script>'));
        self::assertSame('<script>ok()</script>', $cleaner->clean('divi/code', 'content.innerContent', '<script>ok()</script>'));
        self::assertSame('10px', $cleaner->clean('divi/text', 'module.decoration.spacing', '<b>10px</b>'));
        self::assertSame(
            '$variable({"type":"color","value":{"name":"gcid-a1b2","settings":{}}})$',
            $cleaner->clean('divi/text', 'module.decoration.background', '$variable({"type":"color","value":{"name":"gcid-a1b2","settings":{}}})$')
        );
        self::assertSame(['desktop' => ['value' => 'x']], AttrWriter::normalize(['desktop' => 'x']));
    }

    /**
     * Ruling S6: each malicious reference fails and nothing is stored (as an editor without
     * unfiltered_html).
     *
     * @return array<string, array{string, string, array<string, mixed>, array<string, mixed>}>
     */
    public static function malicious(): array
    {
        $cases = [];
        foreach (DiviFixtures::maliciousRefs() as $name => [$value]) {
            $cases[$name] = ['divi/text', 'content.innerContent', ['desktop' => $value], self::TEXT];
        }

        $cases['embedded reference in rich text'] = [
            'divi/text',
            'content.innerContent',
            ['desktop' => '<p>Hallo $variable({"type":"content","value":{"name":"post_title","settings":{}}})$</p>'],
            self::TEXT,
        ];
        $cases['embedded reference deep in a value'] = [
            'divi/text',
            'module.decoration.background',
            ['desktop' => ['image' => ['url' => 'https://a.test/$variable({"type":"content","value":{"name":"post_title","settings":{}}})$']]],
            self::TEXT,
        ];
        // S28: markers a real sanitizer rebuilds after the raw check (verified in DDEV).
        $reference = '({"type":"content","value":{"name":"post_title","settings":{"before":"<script>alert(1)</script>","after":""}}})$';
        $cases['tag-split marker in rich text'] = [
            'divi/text', 'content.innerContent', ['desktop' => '$variable<x>' . $reference], self::TEXT,
        ];
        $cases['octet-split marker in a text title'] = [
            'divi/heading', 'title.innerContent', ['desktop' => '$variable%41' . $reference], self::HEADING,
        ];
        $cases['tag-split marker deep in a value'] = [
            'divi/text', 'module.decoration.background', ['desktop' => ['color' => '$variable<x>' . $reference]], self::TEXT,
        ];
        $cases['sanitizer-built valid reference'] = [
            'divi/text',
            'content.innerContent',
            ['desktop' => '$variable<x>({"type":"color","value":{"name":"gcid-a1b2","settings":{}}})$'],
            self::TEXT,
        ];
        $cases['javascript via a reference in a URL field'] = [
            'divi/fullwidth-header',
            'buttonOne.innerContent',
            ['desktop' => [
                'text' => 'Los',
                'linkUrl' => '$variable({"type":"content","value":{"name":"post_link_url","settings":{"before":"javascript:alert(1)//","after":""}}})$',
            ]],
            [],
        ];
        $cases['javascript via a reference in a URL key'] = [
            'divi/text',
            'module.advanced.link',
            ['desktop' => ['url' => '$variable({"type":"content","value":{"name":"custom_meta_ziel","settings":{"before":"javascript:","after":""}}})$']],
            self::TEXT,
        ];

        return $cases;
    }

    /**
     * @dataProvider malicious
     * @param array<string, mixed> $map
     * @param array<string, mixed> $attrs
     */
    public function testRejectsMaliciousReferencesAndStoresNothing(string $module, string $path, array $map, array $attrs): void
    {
        $result = ComposeFixture::attrWriter()->apply($module, $attrs, [$path => $map], 'attrs');

        self::assertArrayHasKey('attrs.' . $path, $result['errors']);
        self::assertSame($attrs, $result['attrs']);
    }

    /** S28: the split-marker rows carry no marker before sanitizing, but the sanitizer rebuilds one. */
    public function testSplitMarkersAreRebuiltBySanitizing(): void
    {
        $sanitizer = ComposeFixture::sanitizer();
        $rows = ['tag-split marker in rich text', 'octet-split marker in a text title',
            'tag-split marker deep in a value'];
        foreach (array_intersect_key(self::malicious(), array_flip($rows)) as $name => [, , $map]) {
            $raw = (string) json_encode($map, JSON_UNESCAPED_SLASHES);
            $value = is_array($map['desktop']) ? $map['desktop']['color'] : $map['desktop'];
            self::assertStringNotContainsString('$variable(', $value, $name);
            self::assertStringContainsString('$variable(', $sanitizer->text($value) . $sanitizer->html($value), $name . ' ' . $raw);
        }
    }

    /** Ruling S21: an editor's script in before/after is cleaned out, the reference re-serialized. */
    public function testReferenceSettingsAreCleanedForEditors(): void
    {
        $sent = '$variable({"type":"content","value":{"name":"post_title","settings":{"after":"","before":"<script>alert(1)</script>Titel: "}}})$';
        $result = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, ['content.innerContent' => ['desktop' => $sent]], 'attrs');

        self::assertSame([], $result['errors']);
        self::assertSame(
            '$variable({"type":"content","value":{"name":"post_title","settings":{"after":"","before":"Titel: "}}})$',
            $result['attrs']['content']['innerContent']['desktop']['value']
        );
    }

    /** Ruling S7: Divi's own HTML/attribute fields only for users with unfiltered_html. */
    public function testHtmlAndAttributeFieldsNeedUnfilteredHtml(): void
    {
        $changes = [
            'module.decoration.attributes' => ['desktop' => ['attributes' => [['name' => 'data-x', 'value' => '1']]]],
            'module.advanced.html' => ['desktop' => ['elementType' => 'section']],
        ];

        $editor = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, $changes, 'attrs');
        self::assertSame(self::TEXT, $editor['attrs']);
        self::assertStringContainsString('nur im Divi-Builder', $editor['errors']['attrs.module.decoration.attributes']);
        self::assertStringContainsString('nur im Divi-Builder', $editor['errors']['attrs.module.advanced.html']);

        $removal = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, ['module.advanced.html' => null], 'attrs');
        self::assertArrayHasKey('attrs.module.advanced.html', $removal['errors']);

        $admin = ComposeFixture::attrWriter(true)->apply('divi/text', self::TEXT, $changes, 'attrs');
        self::assertSame([], $admin['errors']);
        self::assertSame('section', $admin['attrs']['module']['advanced']['html']['desktop']['value']['elementType']);
        self::assertSame('data-x', $admin['attrs']['module']['decoration']['attributes']['desktop']['value']['attributes'][0]['name']);

        // Deeper paths and the canvas portal's custom CSS are gated too (fix round 1, M-2).
        foreach (['module.advanced.html.htmlBefore', 'module.decoration.attributes.desktop', 'css.advanced.customCss'] as $path) {
            try {
                ComposeFixture::cleaner()->clean('divi/canvas-portal', $path, 'x');
                self::fail('Accepted for an editor: ' . $path);
            } catch (InvalidArgumentException $e) {
                self::assertStringContainsString('nur im Divi-Builder', $e->getMessage());
            }
        }
        self::assertSame('x', ComposeFixture::cleaner(true)->clean('divi/canvas-portal', 'css.advanced.customCss', 'x'));
        self::assertSame('x', ComposeFixture::cleaner()->clean('divi/text', 'module.advanced.htmlish', 'x'));

        $this->expectException(InvalidArgumentException::class);
        $this->expectExceptionMessage('nur im Divi-Builder');
        ComposeFixture::cleaner()->clean('divi/button', 'module.decoration.attributes', ['attributes' => []]);
    }

    /** Ruling S13: keys inside value maps are plain identifiers. */
    public function testRejectsOddKeysInsideValues(): void
    {
        $result = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, [
            'module.decoration.spacing' => ['desktop' => ['<img src=x onerror=1>' => '1px']],
        ], 'attrs');

        self::assertStringContainsString('Schlüssel', $result['errors']['attrs.module.decoration.spacing']);
        self::assertSame(self::TEXT, $result['attrs']);
    }

    public function testRejectsInvalidUtf8(): void
    {
        $result = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, [
            'content.innerContent' => ['desktop' => "<p>\xC3\x28</p>"],
        ], 'attrs');

        self::assertStringContainsString('UTF-8', $result['errors']['attrs.content.innerContent']);
    }

    public function testReferencesFromAnEarlierReadAreReserialized(): void
    {
        $result = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, [
            'module.decoration.background' => ['desktop' => [
                'color' => '$variable({"value":{"name":"gcid-a1b2","settings":[]},"type":"color"})$',
            ]],
        ], 'attrs');

        self::assertSame([], $result['errors']);
        self::assertSame(
            '$variable({"type":"color","value":{"name":"gcid-a1b2","settings":{}}})$',
            $result['attrs']['module']['decoration']['background']['desktop']['value']['color']
        );
    }

    /**
     * Ruling S32a: "<" followed by VT/FF is a literal "<" for strip_tags / sanitize_text_field;
     * stripping the control character only after the sanitizer would build a real tag. Controls
     * go on the RAW value, so the sanitizer sees – and removes – the tag.
     */
    public function testControlCharactersGoBeforeTheSanitizer(): void
    {
        $writer = ComposeFixture::attrWriter();
        $cleaner = ComposeFixture::cleaner();
        $img = '<' . chr(11) . 'img src=x onerror=alert(1)>';
        $script = '<' . chr(12) . 'script>alert(1)</script>';
        // The fake reproduces the WordPress behaviour the attack relies on.
        self::assertStringContainsString('<' . chr(11) . 'img', ComposeFixture::sanitizer()->text($img));

        foreach ([$img . 'Titel', $script . 'Titel'] as $value) {
            $result = $writer->apply('divi/heading', self::HEADING, ['title.innerContent' => ['desktop' => $value]], 'attrs');
            self::assertSame([], $result['errors']);
            $stored = $result['attrs']['title']['innerContent']['desktop']['value'];
            self::assertStringNotContainsString('<', $stored);

            $button = $cleaner->clean('divi/button', 'button.innerContent', $value, 'text');
            self::assertStringNotContainsString('<', $button);
        }
    }

    /** Ruling S34: value keys are whole identifiers – "$" must not match before a trailing newline. */
    public function testValueKeysRejectATrailingNewline(): void
    {
        $result = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, [
            'module.decoration.spacing' => ['desktop' => ['padding' => ["top\n" => '1px']]],
        ], 'attrs');

        self::assertStringContainsString('Schlüssel', $result['errors']['attrs.module.decoration.spacing']);
    }

    /**
     * Ruling S35: controls go once at the entry of apply(), before placeholder resolution – a
     * control-split placeholder is the placeholder (resolved and checked), never literal text
     * that slipped past the placeholder check. Also deep inside values.
     */
    public function testControlCharactersGoBeforePlaceholderResolution(): void
    {
        $writer = ComposeFixture::attrWriter();
        $reference = '$variable({"type":"content","value":{"name":"post_title","settings":{"before":"","after":""}}})$';

        foreach ([chr(0), chr(1), chr(11), chr(127)] as $control) {
            $result = $writer->apply(
                'divi/heading',
                [],
                ['title.innerContent' => ['desktop' => '{' . $control . '{post:title}}']],
                'attrs'
            );
            self::assertSame([], $result['errors'], (string) ord($control));
            self::assertSame($reference, $result['attrs']['title']['innerContent']['desktop']['value']);

            // Embedded: refused like "{{post:title}}" inside text.
            $embedded = $writer->apply(
                'divi/heading',
                [],
                ['title.innerContent' => ['desktop' => 'Hallo {' . $control . '{post:title}}']],
                'attrs'
            );
            self::assertStringContainsString('allein im Wert', $embedded['errors']['attrs.title.innerContent']);
            self::assertSame([], $embedded['attrs']);

            $deep = $writer->apply(
                'divi/button',
                [],
                ['button.innerContent' => ['desktop' => ['text' => "{{post:ti" . $control . "tle}}"]]],
                'attrs'
            );
            self::assertSame([], $deep['errors']);
            self::assertSame($reference, $deep['attrs']['button']['innerContent']['desktop']['value']['text']);
        }
    }

    /** Ruling S41: structure attributes are refused whatever the catalog says (also for admins, also null). */
    public function testStructureAttributesAreRefused(): void
    {
        foreach ([
            ['divi/section', 'module.advanced.type', ['desktop' => 'specialty']],
            ['divi/section', 'module.advanced.type', null],
            ['divi/section', 'module.advanced', ['desktop' => ['type' => 'fullwidth']]],
            ['divi/column', 'module.advanced.specialtyColumns', ['desktop' => '2']],
        ] as [$module, $path, $map]) {
            $result = ComposeFixture::attrWriter(true)->apply($module, [], [$path => $map], 'attrs');

            self::assertStringContainsString('Struktur', $result['errors']['attrs.' . $path] ?? '', $module . ' ' . $path);
            self::assertSame([], $result['invalid_paths'], $path);
            self::assertSame([], $result['attrs'], $path);
        }

        $column = ComposeFixture::attrWriter()->apply('divi/column', [], ['module.advanced.specialtyColumns' => null], 'attrs');
        self::assertStringNotContainsString('section_type', $column['errors']['attrs.module.advanced.specialtyColumns']);
        $section = ComposeFixture::attrWriter()->apply('divi/section', [], ['module.advanced.type' => null], 'attrs');
        self::assertStringContainsString('section_type', $section['errors']['attrs.module.advanced.type']);

        $heading = ComposeFixture::attrWriter()->apply('divi/heading', [], ['module.meta.adminLabel' => ['desktop' => 'x']], 'attrs');
        self::assertSame([], $heading['errors'], 'only section type and specialty columns are structure');
    }

    /** Ruling P16: interactions (setAttribute on the frontend) only with unfiltered_html – set and removal. */
    public function testInteractionsNeedUnfilteredHtml(): void
    {
        $interaction = ['interactions' => [[
            'trigger' => 'click',
            'effect' => 'addAttribute',
            'attributeName' => 'data-probe',
            'attributeValue' => '1',
        ]]];
        $changes = ['module.decoration.interactions' => ['desktop' => $interaction]];

        $editor = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, $changes, 'attrs');
        self::assertSame(self::TEXT, $editor['attrs']);
        $key = 'attrs.module.decoration.interactions';
        self::assertStringContainsString('nur im Divi-Builder', $editor['errors'][$key]);

        $remove = ['module.decoration.interactions' => null];
        $removal = ComposeFixture::attrWriter()->apply('divi/text', self::TEXT, $remove, 'attrs');
        self::assertStringContainsString('nur im Divi-Builder', $removal['errors'][$key]);

        $admin = ComposeFixture::attrWriter(true)->apply('divi/text', self::TEXT, $changes, 'attrs');
        self::assertSame([], $admin['errors']);
        $stored = $admin['attrs']['module']['decoration']['interactions']['desktop']['value']['interactions'];
        self::assertSame('data-probe', $stored[0]['attributeName']);
        $adminRemoval = ComposeFixture::attrWriter(true)->apply('divi/text', $admin['attrs'], $remove, 'attrs');
        self::assertSame([], $adminRemoval['errors']);
        self::assertArrayNotHasKey('interactions', $adminRemoval['attrs']['module']['decoration'] ?? []);
    }

    /**
     * The Lottie module of Divi 5.2.1 (excerpt of lottie/module.json: the animation source group) –
     * the sample metadata has no Lottie module.
     */
    private static function lottieWriter(bool $unfiltered): AttrWriter
    {
        $catalog = new ModuleCatalog([[
            'name' => 'divi/lottie',
            'title' => 'Lottie',
            'category' => 'module',
            'attributes' => ['lottie' => ['type' => 'object', 'settings' => ['innerContent' => [
                'groupType' => 'group-item',
                'item' => [
                    'attrName' => 'lottie.innerContent',
                    'component' => ['type' => 'field', 'name' => 'divi/lottie'],
                ],
            ]]]],
        ]]);
        $cleaner = new ValueCleaner($catalog, ComposeFixture::references(), ComposeFixture::sanitizer($unfiltered));

        return new AttrWriter($catalog, ComposeFixture::placeholders(), $cleaner);
    }

    /** Ruling P19: the Lottie source only with unfiltered_html – set and removal. */
    public function testLottieSourceNeedsUnfilteredHtml(): void
    {
        $changes = ['lottie.innerContent' => ['desktop' => ['src' => 'https://probe.example/anim.json']]];
        $remove = ['lottie.innerContent' => null];
        $key = 'attrs.lottie.innerContent';

        $editor = self::lottieWriter(false)->apply('divi/lottie', [], $changes, 'attrs');
        self::assertSame([], $editor['attrs']);
        self::assertStringContainsString('nur im Divi-Builder', $editor['errors'][$key]);

        $removal = self::lottieWriter(false)->apply('divi/lottie', [], $remove, 'attrs');
        self::assertStringContainsString('nur im Divi-Builder', $removal['errors'][$key]);

        $admin = self::lottieWriter(true)->apply('divi/lottie', [], $changes, 'attrs');
        self::assertSame([], $admin['errors']);
        self::assertSame(
            'https://probe.example/anim.json',
            $admin['attrs']['lottie']['innerContent']['desktop']['value']['src']
        );
        $adminRemoval = self::lottieWriter(true)->apply('divi/lottie', $admin['attrs'], $remove, 'attrs');
        self::assertSame([], $adminRemoval['errors']);
        self::assertArrayNotHasKey('lottie', $adminRemoval['attrs']);
    }
}