<?php

namespace App\Models;

use Exception;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class Pricing extends Model
{
    use HasFactory;

    protected $fillable = ['service_id', 'service_type', 'currency', 'price', 'term', 'as_usd', 'usd_per_month', 'next_due_date'];

    private static function refreshRates(): object
    {
        if (Cache::has("currency_rates")) {
            return Cache::get("currency_rates");
        }
        $response_json = file_get_contents("https://open.er-api.com/v6/latest/USD");
        if (false === $response_json) {
            Log::error("do file_get_contents failed");
            return (object)null;
        }
        try {
            $response = json_decode($response_json);
            if ('success' === $response->result) {
                return Cache::remember("currency_rates", now()->addWeek(1), function () use ($response) {
                    return $response->rates;
                });
            }
            Log::error("server response is " . $response->result . ", expecting success");
        } catch (Exception $e) {
            Log::error("failed to request v6.exchangerate-api.com", ['err' => $e]);
        }
        return (object)null;
    }

    private static function getRates($currency): float
    {
        $rate = self::refreshRates()->$currency;
        return $rate === null ? 1.00 : $rate;
    }

    public static function getCurrencyList(): array
    {
        return array_keys((array)self::refreshRates());
    }

    public static function convertFromUSD(string $amount, string $convert_to): float
    {
        return $amount * self::getRates($convert_to);
    }

    public function convertToUSD(string $amount, string $convert_from): float
    {
        return $amount / self::getRates($convert_from);
    }

    public function costAsPerMonth(string $cost, int $term): float
    {
        if ($term === 1) {
            return $cost;
        } elseif ($term === 2) {
            return ($cost / 3);
        } elseif ($term === 3) {
            return ($cost / 6);
        } elseif ($term === 4) {
            return ($cost / 12);
        } elseif ($term === 5) {
            return ($cost / 24);
        } elseif ($term === 6) {
            return ($cost / 36);
        } else {
            return $cost;
        }
    }

    public function termAsMonths(int $term): int
    {
        if ($term === 1) {
            return 1;
        } elseif ($term === 2) {
            return 3;
        } elseif ($term === 3) {
            return 6;
        } elseif ($term === 4) {
            return 12;
        } elseif ($term === 5) {
            return 24;
        } elseif ($term === 6) {
            return 36;
        } else {
            return 62;
        }
    }

    public function deletePricing($id): void
    {
        DB::table('pricings')->where('service_id', '=', $id)->delete();
    }

    public function insertPricing(int $type, string $service_id, string $currency, float $price, int $term, string $next_due_date, int $is_active = 1)
    {
        $as_usd = $this->convertToUSD($price, $currency);
        return self::create([
            'service_type' => $type,
            'service_id' => $service_id,
            'currency' => $currency,
            'price' => $price,
            'term' => $term,
            'as_usd' => $as_usd,
            'usd_per_month' => $this->costAsPerMonth($as_usd, $term),
            'next_due_date' => $next_due_date,
            'active' => $is_active
        ]);
    }

    public function updatePricing(string $service_id, string $currency, float $price, int $term, float $as_usd, string $next_due_date, int $is_active = 1)
    {
        return DB::table('pricings')
            ->where('service_id', $service_id)
            ->update([
                'currency' => $currency,
                'price' => $price,
                'term' => $term,
                'as_usd' => $as_usd,
                'usd_per_month' => $this->costAsPerMonth($as_usd, $term),
                'next_due_date' => $next_due_date,
                'active' => ($is_active) ? 1 : 0
            ]);
    }

    public static function allPricing()
    {
        return Cache::remember('all_pricing', now()->addWeek(1), function () {
            return DB::table('pricings')
                ->get();
        });
    }

}