package request

import (
	"fmt"
	"io"
	"net/http"
	"strings"
)

type RequestService struct {
	api    string
	apiKey string
}

func NewRequestService(api, apiKey string) RequestService {
	return RequestService{
		api:    api,
		apiKey: apiKey,
	}
}

func getPayload(employeeIDList []string) (string, error) {
	employees := strings.Builder{}
	_, err := employees.Write([]byte(`<EmployeeWorkInformationQuery xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><EmployeeNumbers>`))
	if err != nil {
		return "", fmt.Errorf("error while write headers: %s", err)
	}

	for _, employeeID := range employeeIDList {
		employees.Write([]byte("<string>" + employeeID + "</string>"))
	}
	_, err = employees.Write([]byte("</EmployeeNumbers></EmployeeWorkInformationQuery>"))
	if err != nil {
		return "", fmt.Errorf("error while write footer: %s", err)
	}

	return employees.String(), nil
}

func (r RequestService) EmployeeWorkInformation(data *[]byte, employeeIDList []string, from, to string) error {
	url := r.api + "/EmployeeWorkInformation/Search/" + from + "/" + to + "/"

	stringPayload, err := getPayload(employeeIDList)
	if err != nil {
		return fmt.Errorf("getPayload: %s", err)
	}

	payload := strings.NewReader(stringPayload)
	client := &http.Client{}
	req, err := http.NewRequest("POST", url, payload)

	if err != nil {
		return fmt.Errorf("http.NewRequest: %s", err)
	}
	req.Header.Add("Cache-Control", "no-cache")
	req.Header.Add("Authorization", r.apiKey)
	req.Header.Add("Content-Type", "application/xml")

	res, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("client.Do: %s", err)
	}
	defer res.Body.Close()

	for {
		if len(*data) == cap(*data) {
			// Add more capacity (let append pick how much).
			*data = append(*data, 0)[:len(*data)]
		}
		n, err := res.Body.Read((*data)[len(*data):cap(*data)])
		*data = (*data)[:len(*data)+n]
		if err != nil {
			if err == io.EOF {
				err = nil
			}
			return err
		}
	}

	// data, err = io.ReadAll(res.Body)
	// if err != nil {
	// 	return fmt.Errorf("ioutil.ReadAll: %s", err)
	// }

	//log.Println("readed", string(body))
	return nil
}