<?php
namespace Contabilidad\Common\Service;

use Carbon\Carbon;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\ConnectException;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Exception\ServerException;
use ProVM\Common\Factory\Model as Factory;
use Contabilidad\Moneda;
use Contabilidad\TipoCambio;

class TiposCambios {
    protected $client;
    protected $factory;
    protected $base_url;
    protected $key;
    public function __construct(Client $client, Factory $factory, $api_url, $api_key) {
        $this->client = $client;
        $this->factory = $factory;
        $this->base_url = $api_url;
        $this->key = $api_key;
    }
    protected function getWeekday(\DateTimeInterface $fecha) {
        if ($fecha->weekday() == 0) {
            return $fecha->subWeek()->weekday(5);
        }
        if ($fecha->weekday() == 6) {
            return $fecha->weekday(5);
        }
        return $fecha;
    }
    protected function getValor(\DateTimeInterface $fecha, string $moneda_codigo) {
        $data = [
            'fecha' => $fecha->format('Y-m-d'),
            'desde' => $moneda_codigo
        ];
        $headers = [
            'Authorization' => "Bearer {$this->key}"
        ];
        $url = implode('/', [
            $this->base_url,
            'cambio',
            'get'
        ]);
        try {
            $response = $this->client->request('POST', $url, ['json' => $data, 'headers' => $headers]);
        } catch (ConnectException | RequestException | ServerException $e) {
            error_log($e);
            return null;
        }
        if ($response->getStatusCode() !== 200) {
            error_log('Could not connect to python API.');
            return null;
        }
        $result = json_decode($response->getBody());
        if (isset($result->message) and $result->message === 'Not Authorized') {
            error_log('Not authorized for connecting to python API.');
            return null;
        }
        return $result->serie[0]->valor;
    }
    public function get(string $fecha, int $moneda_id) {
        $fecha = Carbon::parse($fecha);
        $moneda = $this->factory->find(Moneda::class)->one($moneda_id);
        if ($moneda->codigo == 'USD') {
            $fecha = $this->getWeekday($fecha);
        }
        // If a value exists in the database
        $cambio = $moneda->cambio($fecha);
        if ($cambio !== null) {
            if ($cambio->desde()->id != $moneda->id) {
                return 1 / $cambio->valor;
            }
            return $cambio->valor;
        }
        $valor = $this->getValor($fecha, $moneda->codigo);
        if ($valor === null) {
            return 1;
        }
        $data = [
            'fecha' => $fecha->format('Y-m-d H:i:s'),
            'desde_id' => $moneda->id,
            'hasta_id' => 1,
            'valor' => $valor
        ];
        $tipo = TipoCambio::add($this->factory, $data);
        if ($tipo !== false and $tipo->is_new()) {
            $tipo->save();
        }
        return $valor;
    }
}