<?php

/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://www.elastic.co/licensing/elastic-license
 */

namespace App\Utils;

use App\Models\Client;
use App\Utils\Traits\MakesDates;
use Carbon\Carbon;
use Illuminate\Support\Str;
use stdClass;

class Helpers
{
    use MakesDates;

    public static function sharedEmailVariables(?Client $client, array $settings = null): array
    {
        if (!$client) {
            $elements['signature'] = '';
            $elements['settings'] = new stdClass;
            $elements['whitelabel'] = true;
            $elements['company'] = '';
            return $elements;
        }

        $_settings = is_null($settings) ? $client->getMergedSettings() : $settings;

        $elements['signature'] = $_settings->email_signature;
        $elements['settings'] = $_settings;
        $elements['whitelabel'] = $client->company->account->isPaid() ? true : false;
        $elements['company'] = $client->company;
        
        return $elements;
    }

    /**
     * A centralised method to format the custom fields content.
     *
     * @param mixed|null $custom_fields
     * @param mixed $field
     * @param mixed $value
     * @param \App\Models\Client|null $client
     *
     * @return null|string
     */
    public function formatCustomFieldValue($custom_fields, $field, $value, Client $client = null): ?string
    {
        $custom_field = '';

        if ($custom_fields && property_exists($custom_fields, $field)) {
            $custom_field = $custom_fields->{$field};
            $custom_field_parts = explode('|', $custom_field);

            if (count($custom_field_parts) >= 2) {
                $custom_field = $custom_field_parts[1];
            }
        }

        switch ($custom_field) {
            case 'date':
                return is_null($client) ? $value : $this->translateDate($value, $client->date_format(), $client->locale());
                break;

            case 'switch':
                return trim($value) == 'yes' ? ctrans('texts.yes') : ctrans('texts.no');
                break;

            default:
                return is_null($value) ? '' : $value;
                break;
        }
    }

    /**
     * A centralised method to make custom field.
     * @param mixed|null $custom_fields
     * @param mixed $field
     *
     * @return string
     */
    public function makeCustomField($custom_fields, $field): string
    {
        if ($custom_fields && property_exists($custom_fields, $field)) {
            $custom_field = $custom_fields->{$field};

            $custom_field_parts = explode('|', $custom_field);

            return $custom_field_parts[0];
        }

        return '';
    }

    /**
     * Process reserved keywords on PDF.
     *  
     * @param string $value 
     * @param Client $client 
     * @return null|string 
     */
    public static function processReservedKeywords(?string $value, Client $client): ?string
    {
        if(!$value)
            return '';
        
        Carbon::setLocale($client->locale());

        $replacements = [
            'literal' => [
                ':MONTH' => Carbon::createFromDate(now()->year, now()->month)->translatedFormat('F'),
                ':YEAR' => now()->year,
                ':QUARTER' => 'Q' . now()->quarter,
                ':WEEK_BEFORE' => \sprintf(
                    '%s %s %s',
                    Carbon::now()->subDays(7)->translatedFormat($client->date_format()),
                    ctrans('texts.to'),
                    Carbon::now()->translatedFormat($client->date_format())
                ),
                ':WEEK_AHEAD' => \sprintf(
                    '%s %s %s',
                    Carbon::now()->addDays(7)->translatedFormat($client->date_format()),
                    ctrans('texts.to'),
                    Carbon::now()->addDays(14)->translatedFormat($client->date_format())
                ),
                ':WEEK' => \sprintf(
                    '%s %s %s', 
                    Carbon::now()->translatedFormat($client->date_format()), 
                    ctrans('texts.to'), 
                    Carbon::now()->addDays(7)->translatedFormat($client->date_format())
                ),
            ],
            'raw' => [
                ':MONTH' => now()->month,
                ':YEAR' => now()->year,
                ':QUARTER' => now()->quarter,
            ],
            'ranges' => [
              'MONTHYEAR' => Carbon::createFromDate(now()->year, now()->month),
            ],
            'ranges_raw' => [
                'MONTH' => now()->month,
                'YEAR' => now()->year,
            ],
        ];

        // First case, with ranges.
        preg_match_all('/\[(.*?)]/', $value, $ranges);

        $matches = array_shift($ranges);

        foreach ($matches as $match) {
            if (!Str::contains($match, '|')) {
                continue;
            }

            if (Str::contains($match, '|')) {
                $parts = explode('|', $match); // [ '[MONTH', 'MONTH+2]' ]

                $left = substr($parts[0], 1); // 'MONTH'
                $right = substr($parts[1], 0, -1); // MONTH+2

                // If left side is not part of replacements, skip.
                if (!array_key_exists($left, $replacements['ranges'])) {
                    continue;
                }

                $_left = Carbon::createFromDate(now()->year, now()->month)->translatedFormat('F Y');
                $_right = '';

                // If right side doesn't have any calculations, replace with raw ranges keyword.
                if (!Str::contains($right, ['-', '+', '/', '*'])) {
                    $_right = Carbon::createFromDate(now()->year, now()->month)->translatedFormat('F Y');
                }

                // If right side contains one of math operations, calculate.
                if (Str::contains($right, ['+'])) {
                    $operation = preg_match_all('/(?!^-)[+*\/-](\s?-)?/', $right, $_matches);

                    $_operation = array_shift($_matches)[0]; // + -

                    $_value = explode($_operation, $right); // [MONTHYEAR, 4]

                    $_right = Carbon::createFromDate(now()->year, now()->month)->addMonths($_value[1])->translatedFormat('F Y');
                }

                $replacement = sprintf('%s to %s', $_left, $_right);

                $value = preg_replace(
                    sprintf('/%s/', preg_quote($match)), $replacement, $value, 1
                );
            }
        }


        // Second case with more common calculations.
        preg_match_all('/:([^:\s]+)/', $value, $common);

        $matches = array_shift($common);

        foreach ($matches as $match) {
            $matches = collect($replacements['literal'])->filter(function ($value, $key) use ($match) {
                return Str::startsWith($match, $key);
            });

            if ($matches->count() === 0) {
                continue;
            }

            if (!Str::contains($match, ['-', '+', '/', '*'])) {
                $value = preg_replace(
                    sprintf('/%s/', $matches->keys()->first()), $replacements['literal'][$matches->keys()->first()], $value, 1
                );
            }

            if (Str::contains($match, ['-', '+', '/', '*'])) {
                $operation = preg_match_all('/(?!^-)[+*\/-](\s?-)?/', $match, $_matches);

                $_operation = array_shift($_matches)[0];

                $_value = explode($_operation, $match); // [:MONTH, 4]

                $raw = strtr($matches->keys()->first(), $replacements['raw']); // :MONTH => 1

                $number = $res = preg_replace("/[^0-9]/", '', $_value[1]); // :MONTH+1. || :MONTH+2! => 1 || 2

                $target = "/{$matches->keys()->first()}\\{$_operation}{$number}/"; // /:$KEYWORD\\$OPERATION$VALUE => /:MONTH\\+1

                $output = (int) $raw + (int)$_value[1];

                if ($operation == '+') {
                    $output = (int) $raw + (int)$_value[1]; // 1 (:MONTH) + 4
                }

                if ($_operation == '-') {
                    $output = (int)$raw - (int)$_value[1]; // 1 (:MONTH) - 4
                }

                if ($_operation == '/' && (int)$_value[1] != 0) {
                    $output = (int)$raw / (int)$_value[1]; // 1 (:MONTH) / 4
                }

                if ($_operation == '*') {
                    $output = (int)$raw * (int)$_value[1]; // 1 (:MONTH) * 4
                }

                if ($matches->keys()->first() == ':MONTH') {
                    $output = \Carbon\Carbon::create()->month($output)->translatedFormat('F');
                }

                $value = preg_replace(
                    $target, $output, $value, 1
                );
            }
        }

        return $value;
    }

    /**
     * Resolve the font from the supported fonts array.
     * 
     * @param string $font 
     * @return array 
     */
    public static function resolveFont(string $font = 'Arial'): array
    {
        return $font
            ? ['name' => str_replace('_', ' ', $font), 'url' => sprintf('https://fonts.googleapis.com/css2?family=%s&display=swap', str_replace('_', '+', $font))]
            : ['name' => 'Arial', 'url' => ''];
    }
}