<?php

declare(strict_types=1);

namespace LIT\MCP\Integrations\Divi\Design;

use ET\Builder\Packages\GlobalData\GlobalData;
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\Integrations\Divi\Release\ReleaseGate;
use RuntimeException;
use WP_Error;

defined('ABSPATH') || exit;

/**
 * Adapter "Designsystem" (spec §3) for the global variables (formats §2, plan 4c V7): reads them through
 * GlobalData::get_global_variables() back into the stored form and writes them through set_global_variables() with
 * the inventory the change was planned on (Divi's own stale check). Without edit_theme_options or Divi's role right
 * "Variables Manager" Divi silently saves nothing – DesignRights::variables() asks canManage() first. Not final so
 * the variable area can be tested with a mock.
 */
class GlobalVariablesAdapter implements DiviAdapter
{
    public static function manifest(): Manifest
    {
        return new Manifest(
            DiviAreas::DESIGN,
            calls: [
                new Call(GlobalData::class . '::get_global_variables', 0),
                new Call(GlobalData::class . '::set_global_variables', 2),
                new Call('et_pb_is_allowed', 1),
            ],
            features: [DiviFeature::VariableWrite]
        );
    }

    /**
     * The stored form: type => ID => entry as arrays, without allowedActions, without the customizer fonts and the
     * group "colors" (both are not stored there), empty groups left out.
     *
     * @return array<string, array<string, array<string, mixed>>>
     */
    public function read(): array
    {
        $data = [];
        foreach (GlobalData::get_global_variables() as $type => $items) {
            if ($type === 'colors' || (! is_array($items) && ! is_object($items))) {
                continue;
            }
            foreach ((array) $items as $id => $item) {
                // Divi's sanitizing keeps gvid- IDs only; the customizer fonts (--et_global_*_font) are not stored.
                if (! str_starts_with((string) $id, 'gvid-') || (! is_array($item) && ! is_object($item))) {
                    continue;
                }
                $entry = (array) $item;
                unset($entry['allowedActions']);
                $data[(string) $type][(string) $id] = $entry;
            }
        }

        return $data;
    }

    /**
     * @param array<string, array<string, array<string, mixed>>> $data     The whole new inventory (stored form).
     * @param array<string, array<string, array<string, mixed>>> $expected The inventory the change was planned on.
     * @throws DiviLocked When variable-write is not released – before anything is written.
     * @throws RuntimeException When Divi refuses the inventory (stale, missing IDs, invalid entries).
     */
    public function save(array $data, array $expected): void
    {
        ReleaseGate::assertFeature(DiviFeature::VariableWrite);
        $refusal = GlobalData::set_global_variables($data, $expected);
        if ($refusal instanceof WP_Error) {
            throw new RuntimeException('global variables refused: ' . $refusal->get_error_code() . ' '
                . $refusal->get_error_message());
        }
    }

    /** Divi's role right "Variables Manager"; fail closed without Divi. */
    public function canManage(): bool
    {
        return function_exists('et_pb_is_allowed') && (bool) et_pb_is_allowed('variables_manager');
    }

    /**
     * Audit L5: GlobalData keeps a static copy of the variables 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
    {
        self::forgetCached('variables');
    }

    /** Resets one entry of GlobalData's static runtime cache (private, so by reflection; gone = nothing to reset). */
    private static function forgetCached(string $key): void
    {
        try {
            $cache = new \ReflectionProperty(GlobalData::class, '_cached_data');
            $data = $cache->getValue();
            if (is_array($data) && array_key_exists($key, $data)) {
                $data[$key] = null;
                $cache->setValue(null, $data);
            }
        } catch (\ReflectionException) {
            // Divi without that property: its reads are not cached this way.
        }
    }
}