<?php

declare(strict_types=1);

namespace LIT\MCP\Integrations\Divi\Design;

use ET\Builder\Framework\UserRole\UserRole;
use ET\Builder\Packages\Conversion\Conversion;
use ET\Builder\Packages\GlobalData\GlobalPreset;
use ET\Builder\Packages\ModuleLibrary\ModuleRegistration;
use LIT\MCP\Compatibility\Call;
use LIT\MCP\Integrations\Divi\Release\DiviAdapter;
use LIT\MCP\Integrations\Divi\Release\DiviAreas;
use LIT\MCP\Integrations\Divi\Release\DiviFeature;
use LIT\MCP\Integrations\Divi\Release\DiviLocked;
use LIT\MCP\Compatibility\Manifest;
use LIT\MCP\Compatibility\Mirror;
use LIT\MCP\Integrations\Divi\Release\ReleaseGate;
use RuntimeException;
use WP_Error;

defined('ABSPATH') || exit;

/**
 * Adapter "Designsystem" (spec §3) for writing (Etappe 4): presets are saved the way Divi's own sync route does it
 * (mirror preset-sync of GlobalPresetController::sync, formats "Nachtrag 5.15.1"): prepare_data() sanitizes the REST
 * format, validate_preset_count() refuses a smaller inventory unless presets may be removed, removed presets leave
 * Divi's Divi-4 legacy option, save_data() writes the option and clears the static CSS. Chunks and the route's nonce
 * are not needed in-process; the tools check the rights themselves (spec §10). Also Divi's preset attribute mapping
 * (which attributes a preset may carry) and the Visual Builder role right. Not final so abilities can be tested with
 * a mock.
 */
class DesignSystemWriter implements DiviAdapter
{
    public const ACTION_SAVE = 'ADD_NEW_MODULE_PRESET';

    public const ACTION_DELETE_MODULE = 'DELETE_MODULE_PRESET';

    public const ACTION_DELETE_GROUP = 'DELETE_OPTION_GROUP_PRESET';

    /** Preset attribute types Divi copies into a preset (Conversion::get_preset_attrs). */
    public const PRESET_TYPES = ['style', 'html', 'script'];

    public static function manifest(): Manifest
    {
        return new Manifest(
            DiviAreas::DESIGN,
            calls: [
                // Read by the preset tools as well as by the design system tool.
                new Call(GlobalPreset::class . '::get_data', 0, [DiviFeature::DesignRead, DiviFeature::PresetWrite]),
                new Call(GlobalPreset::class . '::prepare_data', 1),
                new Call(GlobalPreset::class . '::validate_preset_count', 3),
                new Call(GlobalPreset::class . '::get_deleted_preset_ids', 3),
                new Call(GlobalPreset::class . '::remove_preset_from_legacy_option', 2),
                new Call(GlobalPreset::class . '::save_data', 1),
                new Call(Conversion::class . '::get_preset_attrs_mapping', 1),
                new Call(Conversion::class . '::get_preset_attrs', 3),
                // groupsOf(): also used by the composer for group presets (insert/update/assign), so Catalog too.
                new Call(
                    GlobalPreset::class . '::get_group_preset_default_attr',
                    1,
                    [DiviFeature::Catalog, DiviFeature::PresetWrite]
                ),
                new Call(
                    ModuleRegistration::class . '::get_module_settings',
                    1,
                    [DiviFeature::Catalog, DiviFeature::PresetWrite]
                ),
                new Call(UserRole::class . '::can_current_user_use_visual_builder', 0),
            ],
            mirrors: [
                new Mirror(
                    'preset-sync',
                    'includes/builder-5/server/Packages/GlobalData/GlobalPresetController.php',
                    'sync',
                    'GlobalPresetController',
                    'Speicherablauf der Presets (prepare_data, validate_preset_count, Bereinigung der Divi-4-Option '
                        . 'beim Löschen, save_data)'
                ),
            ],
            features: [DiviFeature::PresetWrite]
        );
    }

    /**
     * Audit L5: GlobalPreset::get_data() keeps a static copy that can be older than another writer's finished save
     * (the option cache is dropped by DesignLock). Called under the lock, before reading.
     */
    public function refresh(): void
    {
        try {
            (new \ReflectionProperty(GlobalPreset::class, '_data'))->setValue(null, null);
        } catch (\ReflectionException) {
            // Divi without that property: its reads are not cached this way.
        }
    }

    /** @return array<array-key, mixed> The stored inventory (GlobalPreset::get_data(), formats §3). */
    public function presets(): array
    {
        $data = GlobalPreset::get_data();

        return is_array($data) ? $data : [];
    }

    /**
     * @param array<array-key, mixed> $rest      REST/sync format, see PresetBook::toRest().
     * @param bool                    $mayRemove Deleting or restoring: fewer presets are allowed and removed ones
     *                                           leave Divi's legacy option (like a DELETE_* sync).
     * @return array<array-key, mixed> The inventory Divi stored.
     * @throws DiviLocked When preset-write is not released – before anything is written.
     * @throws RuntimeException When Divi refuses the inventory.
     */
    public function savePresets(array $rest, bool $mayRemove): array
    {
        ReleaseGate::assertFeature(DiviFeature::PresetWrite);
        $prepared = GlobalPreset::prepare_data($rest);
        $current = GlobalPreset::get_data();
        $refusal = GlobalPreset::validate_preset_count(
            $current,
            $prepared,
            $mayRemove ? self::ACTION_DELETE_MODULE : self::ACTION_SAVE
        );
        if ($refusal instanceof WP_Error) {
            throw new RuntimeException('preset sync refused: ' . $refusal->get_error_code() . ' '
                . $refusal->get_error_message());
        }

        if ($mayRemove) {
            foreach (['module', 'group'] as $kind) {
                foreach (GlobalPreset::get_deleted_preset_ids($current, $prepared, $kind) as $deleted) {
                    GlobalPreset::remove_preset_from_legacy_option(
                        (string) ($deleted['id'] ?? ''),
                        (string) ($deleted['moduleName'] ?? '')
                    );
                }
            }
        }

        $saved = GlobalPreset::save_data($prepared);

        return is_array($saved) ? $saved : [];
    }

    /**
     * The option groups of $moduleName that take group presets: attribute path (groupId) => group name, e.g.
     * "module.decoration.spacing" => "divi/spacing" (formats §3). [] without Divi or for an unknown module.
     *
     * @return array<string, string>
     */
    public function groupsOf(string $moduleName): array
    {
        if (! class_exists(ModuleRegistration::class)) {
            return [];
        }

        $settings = ModuleRegistration::get_module_settings($moduleName);
        if ($settings === null) {
            return [];
        }

        $groups = [];
        foreach (GlobalPreset::get_group_preset_default_attr($settings) as $groupId => $group) {
            if (is_array($group) && is_string($group['groupName'] ?? null)) {
                $groups[(string) $groupId] = $group['groupName'];
            }
        }

        return $groups;
    }

    /**
     * The parts of $attrs a preset of $moduleName carries (Divi's preset attribute mapping): all, style
     * (styleAttrs) and render (renderAttrs: html + script).
     *
     * @param array<string, mixed> $attrs
     * @return array{all: array<string, mixed>, style: array<string, mixed>, render: array<string, mixed>}
     */
    public function presetAttrs(string $moduleName, array $attrs): array
    {
        $map = Conversion::get_preset_attrs_mapping($moduleName);

        return [
            'all' => (array) Conversion::get_preset_attrs($attrs, self::PRESET_TYPES, $map),
            'style' => (array) Conversion::get_preset_attrs($attrs, ['style'], $map),
            'render' => (array) Conversion::get_preset_attrs($attrs, ['html', 'script'], $map),
        ];
    }

    /** Divi's role right "Visual Builder verwenden"; fail closed without Divi. */
    public function canUseVisualBuilder(): bool
    {
        return class_exists(UserRole::class) && UserRole::can_current_user_use_visual_builder();
    }
}