package helper

import (
	"bytes"
	"context"
	"fmt"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"time"
)

func SendRequest(method string, endpoint string, values []byte, authKey string, isCouchDbReq bool) ([]byte, error) {

	const ConnectMaxWaitTime = 30 * time.Second
	const RequestMaxWaitTime = 60 * time.Second

	client := http.Client{
		Transport: &http.Transport{
			DialContext: (&net.Dialer{
				Timeout: ConnectMaxWaitTime,
			}).DialContext,
		},
	}

	ctx, cancel := context.WithTimeout(context.Background(), RequestMaxWaitTime)
	defer cancel()

	emptyBody := []byte{}

	req, err := http.NewRequestWithContext(ctx, method, endpoint, bytes.NewBuffer(values))
	req.Proto = "HTTP/2.0"
	if err != nil {
		log.Println(err.Error())
		return emptyBody, err
	}

	q := req.URL.Query()
	req.URL.RawQuery = q.Encode()
	req.Header.Set("Connection", "close")
	req.Header.Add("Authorization", authKey)
	req.Close = true
	client.CloseIdleConnections()

	response, err := client.Do(req)

	if e, ok := err.(net.Error); ok && e.Timeout() {
		if response != nil {
			response.Body.Close()
		}
		log.Println(err.Error())
		return emptyBody, err
	} else if err != nil {
		if response != nil {
			response.Body.Close()
		}
		log.Println(err.Error())
		return emptyBody, err
	}

	// 200 OK
	// 201 Created
	// 202 Accepted
	// 404 Not Found
	// 409 Conflict

	if isCouchDbReq {
		// fmt.Printf("responseStatusCode: %d\n", response.StatusCode)
		if response.StatusCode == http.StatusNotFound {
			if response != nil {
				response.Body.Close()
			}
			return emptyBody, nil
		}
		// TODO: handle conflict error
	} else {
		if response.StatusCode != http.StatusOK {
			if response != nil {
				response.Body.Close()
			}
			err := fmt.Errorf("response: code: %d, body: %v", response.StatusCode, response.Body)
			log.Println(err.Error())
			return emptyBody, err
		}
	}

	body, err := ioutil.ReadAll(response.Body)
	if err != nil {
		log.Println(err.Error())
		if response != nil {
			response.Body.Close()
		}
		return emptyBody, nil
	}

	// if you call it in loop, don't use defer
	response.Body.Close()

	return body, nil
}