package webutility

  // TODO(marko): If DecodeJSON() returns io.EOF treat it as if there is no response body, since response content length can sometimes be -1.

  import (
  	"bytes"
  	"encoding/json"

  	"io"

  	"net/http"
  	"net/url"
  )

  // DecodeJSON decodes JSON data from r to v.
  // Returns an error if it fails.
  func DecodeJSON(r io.Reader, v interface{}) error {
  	return json.NewDecoder(r).Decode(v)
  }

  func GetJSON(url string, v interface{}, params url.Values, headers http.Header) (status int, err error) {
  	p := params.Encode()
  	if p != "" {
  		url += "?" + p
  	}
  
  	req, err := http.NewRequest(http.MethodGet, url, nil)
  	if err != nil {
  		return 0, err
  	}
  
  	if headers != nil {
  		for k, head := range headers {
  			for i, h := range head {
  				if i == 0 {
  					req.Header.Set(k, h)
  				} else {
  					req.Header.Add(k, h)
  				}
  			}
  		}
  	}
  
  	resp, err := http.DefaultClient.Do(req)
  	if err != nil {
  		return 0, err
  	}

  	defer resp.Body.Close()

  	status = resp.StatusCode

  	if status != http.StatusOK {
  		return status, err
  	}

  	if err = DecodeJSON(resp.Body, v); err == io.EOF {
  		err = nil
  	}
  
  	return status, err

  }
  
  func PostJSON(url string, v, r interface{}, params url.Values, headers http.Header) (status int, err error) {
  	buffer := bytes.NewBuffer(make([]byte, 0))
  	json.NewEncoder(buffer).Encode(v)
  
  	p := params.Encode()
  	if p != "" {
  		url += "?" + p
  	}
  
  	req, err := http.NewRequest(http.MethodPost, url, buffer)
  	if err != nil {
  		return 0, err
  	}
  
  	if headers != nil {
  		for k, head := range headers {
  			for i, h := range head {
  				if i == 0 {
  					req.Header.Set(k, h)
  				} else {
  					req.Header.Add(k, h)
  				}
  			}
  		}
  	}
  	req.Header.Set("Content-Type", "application/json")
  
  	resp, err := http.DefaultClient.Do(req)
  	if err != nil {
  		return 0, err
  	}
  	status = resp.StatusCode

  	defer resp.Body.Close()

  	if status != http.StatusOK && status != http.StatusCreated {
  		return status, err
  	}

  	if err = DecodeJSON(resp.Body, v); err == io.EOF {
  		err = nil
  	}

  	return status, err

  }