package api

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"log"
	"mime/multipart"
	"net/http"
)

type API struct {
	Protocol string
	Host     string
	Port     int
	Opts     APIOptions
}

type APIOptions struct {
	KeyAuth   bool
	Key       string
	BasicAuth bool
	Username  string
	Password  string
}

func New(protocol, host string, port int, opts APIOptions) (*API, error) {
	api := API{
		Protocol: protocol,
		Host:     host,
		Port:     port,
		Opts:     opts,
	}

	return &api, nil
}

// Call returns a []byte representing a response body.
// Can be used for GET or DELETE methods
func (a *API) Call(method, route string) ([]byte, error) {
	endpoint := fmt.Sprintf("%s://%s:%d",
		a.Protocol,
		a.Host,
		a.Port,
	)
	request := fmt.Sprintf("%s%s", endpoint, route)

	switch method {
	case http.MethodGet:
		// Create client
		client := &http.Client{}

		// Create request
		request, err := http.NewRequest(http.MethodGet, request, nil)
		if err != nil {
			return nil, err
		}

		if a.Opts.KeyAuth {
			request.Header.Add("Authorization", fmt.Sprintf("Bearer %s", a.Opts.Key))
		}

		// Fetch Request
		response, err := client.Do(request)
		if err != nil {
			return nil, err
		}

		defer response.Body.Close()

		body, err := ioutil.ReadAll(response.Body)
		if err != nil {
			return nil, err
		}

		return body, nil
	case http.MethodDelete:
		// Create client
		client := &http.Client{}

		// Create request
		req, err := http.NewRequest(http.MethodDelete, request, nil)
		if err != nil {
			return nil, err
		}

		if a.Opts.KeyAuth {
			req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", a.Opts.Key))
		}

		// Fetch Request
		resp, err := client.Do(req)
		if err != nil {
			return nil, err
		}
		defer resp.Body.Close()

		// Read Response Body
		respBody, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			return nil, err
		}
		return respBody, nil
	}

	//return nil, errors.New(fmt.Sprintf("method must be 'GET' or 'DELETE', got '%s'", method))
	return nil, errors.New(fmt.Sprintf("method must be 'GET' or 'DELETE', got '%s'", method))
}

func (a *API) UploadDocument(bucket string, file_header *multipart.FileHeader) (string, error) {
	endpoint := fmt.Sprintf("%s://%s:%d",
		a.Protocol,
		a.Host,
		a.Port,
	)

	route := fmt.Sprintf("/v1/bucket/%s", bucket)

	request := fmt.Sprintf("%s%s", endpoint, route)

	client := &http.Client{}

	// set the HTTP method, url, and request body
	req, err := http.NewRequest(http.MethodPost, request, nil)
	if err != nil {
		return "", err
	}

	if a.Opts.KeyAuth {
		req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", a.Opts.Key))
	}

	req.Header.Add("Content-Type", "multipart/form-data")

	// CreateFormFile with multipart.NewWriter
	//TODO
	/*
	   buf := new(bytes.Buffer)
	   form := multipart.NewWriter(buf)
	   form.CreateFormFile("document", )
	*/

	//TODO
	log.Println("req: ", req)

	file, file_header, err := req.FormFile("document")
	if err != nil {
		log.Println("Error during http#Request.Formfile")
		return "", err
	}

	log.Println("file: ", file, "file_header: ", file_header)
	log.Println("file_header: ", file_header)

	resp, err := client.Do(req)
	if err != nil {
		log.Println("Error during http#Client.Do")
		return "", err
	}

	var res map[string]interface{}

	json.NewDecoder(resp.Body).Decode(&res)
	return fmt.Sprintf("%s", res), nil
}

// CallWithData takes data and returns a string representing a response body.
// Can be used for POST or PUT methods
func (a *API) CallWithData(method, route string, data []byte) (string, error) {
	endpoint := fmt.Sprintf("%s://%s:%d",
		a.Protocol,
		a.Host,
		a.Port,
	)
	request := fmt.Sprintf("%s%s", endpoint, route)

	switch method {
	case http.MethodPost:
		// initialize http client
		client := &http.Client{}

		// set the HTTP method, url, and request body
		req, err := http.NewRequest(http.MethodPost, request, bytes.NewBuffer(data))
		if err != nil {
			return "", err
		}

		if a.Opts.KeyAuth {
			req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", a.Opts.Key))
		}

		// set the request header Content-Type for json
		req.Header.Set("Content-Type", "application/json; charset=utf-8")
		resp, err := client.Do(req)
		if err != nil {
			return "", err
		}

		var res map[string]interface{}

		json.NewDecoder(resp.Body).Decode(&res)
		return fmt.Sprintf("%s\n", res["message"]), nil
		/*
			case http.MethodPut:
				// initialize http client
				client := &http.Client{}

				// set the HTTP method, url, and request body
				req, err := http.NewRequest(http.MethodPut, request, bytes.NewBuffer(data))
				if err != nil {
					return "", err
				}

				if a.Opts.KeyAuth {
					req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", a.Opts.Key))
				}

				// set the request header Content-Type for json
				//req.Header.Set("Content-Type", "application/json; charset=utf-8")
				resp, err := client.Do(req)
				if err != nil {
					return "", err
				}

				var res map[string]interface{}

				json.NewDecoder(resp.Body).Decode(&res)
				return fmt.Sprintf("%s\n", res["message"]), nil
		*/
	}

	//return "", errors.New(fmt.Sprintf("method must be 'POST' or 'PUT', got '%s'", method))
	return "", errors.New(fmt.Sprintf("method must be 'POST', got '%s'", method))
}