<?php
namespace Incoviba\Service\Money;

use Exception;
use DateTimeInterface;
use DateTimeImmutable;
use DateInterval;
use Psr\Http\Client\ClientInterface;
use GuzzleHttp\Exception\GuzzleException;
use Incoviba\Common\Implement\Exception\EmptyResponse;
use Incoviba\Common\Ideal;
use Incoviba\Service\Money;

class Ine extends Ideal\Money\Provider
{
    protected string $uri = 'https://api-calculadora.ine.cl/ServiciosCalculadoraVariacion';
    public function __construct(protected ClientInterface $client) {}

    /**
     * @throws EmptyResponse
     * @throws Exception
     */
    public function get(string $money_symbol, ?DateTimeInterface $dateTime = null): float
    {
        if (!$this->supported($money_symbol)) {
            throw new EmptyResponse($money_symbol);
        }
        if ($dateTime === null) {
            $dateTime = new DateTimeImmutable();
        }
        $end = new DateTimeImmutable($dateTime->format('Y-m-1'));
        $start = $end->sub(new DateInterval('P1M'));
        return $this->getVar($start, $end);
    }

    protected array $supportedMap = [
        Money::IPC => 'ipc'
    ];

    /**
     * @throws EmptyResponse
     */
    public function getVar(DateTimeInterface $start, DateTimeInterface $end): float
    {
        $base = 1000000000;
        $request_query = [
            'mesInicio' => $start->format('m'),
            'AnioInicio' => $start->format('Y'),
            'mesTermino' => $end->format('m'),
            'AnioTermino' => $end->format('Y'),
            'valor_a_ajustar' => $base
        ];
        $request_uri = implode('?', [
            $this->uri,
            http_build_query($request_query),
        ]);
        try {
            $response = $this->client->get($request_uri);
        } catch (GuzzleException $exception) {
            throw new EmptyResponse($request_uri, $exception);
        }
        $body = $response->getBody();
        $json = json_decode($body->getContents());
        if (empty($json)) {
            throw new EmptyResponse($request_uri);
        }
        return ((int) str_replace('.', '', $json[0]->valorajustado) - $base) / $base;
    }
}