<?php
namespace Incoviba\Service\Money;

use DateTimeInterface;
use DateTimeImmutable;
use JsonException;
use Psr\Http\Client\ClientExceptionInterface;
use Psr\Http\Client\ClientInterface;
use Psr\Log\LoggerInterface;
use Incoviba\Common\Ideal;
use Incoviba\Common\Implement\Exception\EmptyResponse;
use Incoviba\Service\Money;

class Findic extends Ideal\Money\Provider
{
    public function __construct(LoggerInterface $logger, protected ClientInterface $client)
    {
        parent::__construct($logger);
    }

    protected string $url = 'https://findic.cl/api/';

    public function get(string $money_symbol, ?DateTimeInterface $dateTime = null): float
    {
        if (!$this->supported($money_symbol)) {
            throw new EmptyResponse($money_symbol);
        }
        if ($dateTime === null) {
            $dateTime = new DateTimeImmutable();
        }
        return match (strtolower($money_symbol)) {
            Money::UF, Money::USD => $this->getDate(strtolower($money_symbol), $dateTime),
            Money::IPC => $this->getSum(strtolower($money_symbol), $dateTime,
                DateTimeImmutable::createFromFormat('Y-m-d',
                    $dateTime->modify('-1 year')->format('Y-11-01'))),
            default => throw new EmptyResponse($money_symbol),
        };
    }

    protected array $supportedMap = [
        Money::UF => 'uf',
        Money::IPC => 'ipc',
        Money::USD => 'dolar'
    ];

    /**
     * @param string $request_uri
     * @return float
     * @throws EmptyResponse
     */
    protected function sendRequest(string $request_uri): array
    {
        try {
            $response = $this->client->get($request_uri);
        } catch (ClientExceptionInterface $exception) {
            throw new EmptyResponse($request_uri, $exception);
        }

        if ((int) floor($response->getStatusCode() / 100) !== 2) {
            throw new EmptyResponse($request_uri);
        }
        $body = $response->getBody();
        try {
            $json = json_decode($body->getContents(), true, 512, JSON_THROW_ON_ERROR);
        } catch (JsonException $exception) {
            throw new EmptyResponse($request_uri, $exception);
        }

        if (!array_key_exists('serie', $json) or count($json['serie']) === 0) {
            throw new EmptyResponse($request_uri);
        }
        return $json['serie'];
    }

    /**
     * @param string $symbol
     * @param DateTimeInterface $dateTime
     * @return float
     * @throws EmptyResponse
     */
    protected function getDate(string $symbol, DateTimeInterface $dateTime): float
    {
        $request_uri = "{$this->supportedMap[strtolower($symbol)]}/{$dateTime->format('d-m-Y')}";
        return (float) $this->sendRequest($request_uri)[0]['valor'];
    }

    /**
     * @param string $symbol
     * @param DateTimeInterface $dateTime
     * @param DateTimeInterface|null $fromDateTime
     * @return float
     * @throws EmptyResponse
     */
    protected function getSum(string $symbol, DateTimeInterface $dateTime, ?DateTimeInterface $fromDateTime = null): float
    {
        $dateTime = $dateTime->modify('last day of this month');
        $requestUri = "{$this->supportedMap[strtolower($symbol)]}/{$dateTime->format('Y')}";
        $serie = $this->sendRequest($requestUri);
        $values = array_filter($serie, fn($month) => DateTimeImmutable::createFromFormat('Y-m-d', $month['fecha']) <= $dateTime);
        $value = array_reduce($values, fn($value, $month) => $value + ((float) $month['valor']), 0.0);

        if ($fromDateTime === null) {
            $fromDateTime = $dateTime->modify('-1 year');
        } else {
            $fromDateTime = $fromDateTime->modify('last day of this month');
        }
        $requestUri = "{$this->supportedMap[strtolower($symbol)]}/{$fromDateTime->format('Y')}";
        $serie = $this->sendRequest($requestUri);
        $values = array_filter($serie, fn($month) => DateTimeImmutable::createFromFormat('Y-m-d', $month['fecha']) > $fromDateTime);
        return array_reduce($values, fn($value, $month) => $value + ((float) $month['valor']), $value);
    }
}