<?php

namespace Picea\Extension;

use Picea\Compiler\Context;

class NumberExtension implements Extension, FunctionExtension {

    public string $locale;

    public \NumberFormatter $formatter;

    public function __construct(
        public string|array $token = [ "money", "format", "format_zero" ],
        public string $title = "",
    ) {
        $this->locale = explode('.', \Locale::getDefault())[0];
    }

    public function exportFunctions(): array
    {
        return [
            "money" => [ $this, 'money' ],
            "format" => [ $this, 'format' ],
            "format_zero" => [ $this, 'formatZero' ],
        ];
    }

    public function parse(\Picea\Compiler\Context &$context, ?string $arguments, string $token, array $options = []) : string
    {
        switch($token) {
            case "format":
                return "<?php echo format($arguments) ?>";

            case "format_zero":
                return "<?php echo format_zero($arguments) ?>";

            case "money":
                return "<?php echo money($arguments) ?>";

        }

        return "";
    }

    public function format(int|float $num, int $decimals = 0, null|string $decimalSeparator = ".", null|string $thousandsSeparator = ",") : string
    {
        return number_format($num, $decimals, $decimalSeparator, $thousandsSeparator);
    }

    public function formatZero(int $num, int $length) : string
    {
        return sprintf("%0{$length}d", $num);
    }

    public function money(float $money, ? string $currency = null) /* : string|false */
    {
        $this->formatter ??= new \NumberFormatter($this->locale, \NumberFormatter::CURRENCY);

        $this->formatter->setTextAttribute(\NumberFormatter::CURRENCY_CODE, 'CAD');

        $this->formatter->setPattern( str_replace('¤#','¤ #', $this->formatter->getPattern() ) );

        return $this->formatter->formatCurrency($money, $currency ?? $this->formatter->getTextAttribute(\NumberFormatter::CURRENCY_CODE));
    }

}