<?php

namespace Akky\Money;

class UsdFormatter
{
    /**
     * convert number expressions to value
     *
     * @assert ("34000", 'en') == "$34,000"
     * @assert ("123456.789", 'en') == "$123,457"
     * @assert ("1234567890", 'en') == "$1,234,567,890"
     */
    public static function format($value, $locale = "en") {
        switch($locale) {
        case 'ja':
            return self::formatInJapanese($value);
            break;
        case 'en':
        default:
            if ($locale = 'en') { $locale = 'en-US'; }
            if (class_exists('\NumberFormatter')) {
                $numberFormatter = new \NumberFormatter($locale, \NumberFormatter::CURRENCY);
                // 'en' can not omit decimal places even with this, so set 'en-US'
                $numberFormatter->setAttribute(\NumberFormatter::FRACTION_DIGITS, 0); 
                return $numberFormatter->formatCurrency($value, 'USD');
            } else {
                return $value;
            }
        }
    }
    /**
     * convert number expressions to value
     *
     * @assert ("34000") == "3万4000ドル"
     * @assert ("123456.789") == "12万3457ドル"
     * @assert ("1234567890") == "12億3456万7890ドル"
     * @assert ("17円") == "0.15ドル"
     */
    public static function formatInJapanese($value) {
        $isApproximate = false;
        $formatted = '';
        if ($value > 1000000000000) {
            if ($value % 1000000000000 !== 0) {
                $isApproximate = true;
            }
            $unitValue = floor($value / 1000000000000);
            $formatted .= $unitValue . '兆';
            $value -= $unitValue * 1000000000000;
        }
        if ($value > 100000000) {
            if ($value % 100000000 !== 0
                && !$isApproximate) {
                $isApproximate = true;
            }
            $unitValue = floor($value / 100000000);
            $formatted .= $unitValue . '億';
            $value -= $unitValue * 100000000;
        }
        if ($value > 10000) {
            if ($value % 10000 !== 0
                && !$isApproximate) {
                $isApproximate = true;
            }
            $unitValue = floor($value / 10000);
            $formatted .= $unitValue . '万';
            $value -= $unitValue * 10000;
        }
        if ($value >= 1) {
            $formatted .= round($value);
        } else if ($formatted === '') {
            $formatted .= round($value, 2);
        }
        return $formatted . 'ドル';
    }
}