<?php

/**
 * IFNEX — Helpers for compact Persian-friendly number formatting.
 *
 * File: app/Helpers/number.php
 * Registered in composer.json under autoload.files so the helpers
 * below are globally available across the Laravel app (no namespace).
 */

if (!function_exists('ifnex_format_number')) {
    /**
     * Format a (potentially huge) integer into a compact Persian-friendly string.
     *
     * Examples:
     *   950                       → "۹۵۰"
     *   1500                      → "۲ هزار"
     *   2_400_000                 → "۲.۴ میلیون"
     *   1_019_406_902             → "۱.۰۲ میلیارد"
     *
     * @param int|float|string $number
     * @param string $currency Optional currency suffix (default: ریال). Pass '' to skip.
     * @return string
     */
    function ifnex_format_number(int|float|string $number, string $currency = 'ریال'): string
    {
        $number = (float) $number;
        $abs = abs($number);

        if ($abs >= 1_000_000_000) {
            $formatted = number_format($number / 1_000_000_000, 2);
        } elseif ($abs >= 1_000_000) {
            $formatted = number_format($number / 1_000_000, 1);
        } elseif ($abs >= 1_000) {
            $formatted = number_format($number / 1_000, 0);
        } else {
            $formatted = number_format($number);
        }

        // Convert Latin digits to Persian (fa-IR)
        $formatted = ifnex_persian_digits($formatted);

        // Append compact unit if applicable
        if ($abs >= 1_000_000_000) {
            $formatted .= ' میلیارد';
        } elseif ($abs >= 1_000_000) {
            $formatted .= ' میلیون';
        } elseif ($abs >= 1_000) {
            $formatted .= ' هزار';
        }

        if ($currency !== '' && $currency !== null) {
            $formatted .= ' ' . $currency;
        }

        return trim($formatted);
    }
}

if (!function_exists('ifnex_persian_digits')) {
    /**
     * Replace Latin (0-9) digits in a string with Persian digits (۰-۹).
     * Keeps other characters intact.
     */
    function ifnex_persian_digits(string $text): string
    {
        return strtr($text, [
            '0' => '۰',
            '1' => '۱',
            '2' => '۲',
            '3' => '۳',
            '4' => '۴',
            '5' => '۵',
            '6' => '۶',
            '7' => '۷',
            '8' => '۸',
            '9' => '۹',
        ]);
    }
}

if (!function_exists('ifnex_english_digits')) {
    /**
     * Replace Persian digits back to Latin — handy for form input parsing.
     */
    function ifnex_english_digits(string $text): string
    {
        return strtr($text, [
            '۰' => '0',
            '۱' => '1',
            '۲' => '2',
            '۳' => '3',
            '۴' => '4',
            '۵' => '5',
            '۶' => '6',
            '۷' => '7',
            '۸' => '8',
            '۹' => '9',
            '٠' => '0',
            '١' => '1',
            '٢' => '2',
            '٣' => '3',
            '٤' => '4',
            '٥' => '5',
            '٦' => '6',
            '٧' => '7',
            '٨' => '8',
            '٩' => '9',
        ]);
    }
}

if (!function_exists('ifnex_trend_percent')) {
    /**
     * Compute the percent change between two values and return a tuple of
     * [percent_value, direction ('up'|'down'|'flat'), formatted Persian string].
     *
     * @param float|int|null $current
     * @param float|int|null $previous
     * @return array{0: float, 1: string, 2: string}
     */
    function ifnex_trend_percent(float|int|null $current, float|int|null $previous): array
    {
        $current = (float) ($current ?? 0);
        $previous = (float) ($previous ?? 0);

        if ($previous == 0) {
            return [0.0, $current > 0 ? 'up' : 'flat', '—'];
        }

        $diff = $current - $previous;
        $percent = ($diff / abs($previous)) * 100;

        if ($percent > 0.05) {
            $direction = 'up';
        } elseif ($percent < -0.05) {
            $direction = 'down';
        } else {
            $direction = 'flat';
        }

        $formatted = ifnex_persian_digits(number_format(abs($percent), 1)) . '%';

        return [$percent, $direction, $formatted];
    }
}