<?php

namespace Picea\Extension;

use Picea\Compiler\Context;

class JsonExtension implements Extension, FunctionExtension {

    public array $token = [ "json", "json.pretty", "json.html" ];
    
    public int $flags =  JSON_HEX_TAG | \JSON_HEX_QUOT | \JSON_THROW_ON_ERROR | \JSON_UNESCAPED_UNICODE;
   
    public function parse(/*\Picae\Compiler\Context*/ &$context, ?string $arguments, string $token)
    {
        $flag = $this->flags;

        switch ($token) {
            case "json.pretty":
                $flag |= \JSON_PRETTY_PRINT;
                break;

            case "json.html":
                return "<?php echo htmlentities(json_encode($arguments, {$this->flags}), ENT_QUOTES, 'UTF-8') ?>";
        }

        $cls = static::class;

        return "<?php echo json_encode(\\$cls::utf8($arguments), $flag) ?>";
    }

    public function exportFunctions(): array
    {
        return [
            'json' => function($arguments, ? int $flags = null) {
                return json_encode($arguments, \JSON_FORCE_OBJECT);
            },
        ];
    }

    public static function utf8($src) {

        if (is_array($src)) {
            foreach ($src as $key => $value) {
                $src[$key] = static::utf8($value);
            }
        }
        elseif (is_string($src)) {
            return mb_convert_encoding($src, "UTF-8", "UTF-8");
        }

        return $src;
    }

}