package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"

	"github.com/julienschmidt/httprouter"
)

func init() {
	router.GET("/auth", authHandler(apiHandler(validateAuthToken, printStudent)))
	router.POST("/auth", apiHandler(checkAuth))
}

func printStudent(std *Student, r *http.Request) error {
	if std != nil {
		return errors.New(fmt.Sprintf("%s", *std))
	} else {
		return nil
	}
}

func validateAuthToken(_ httprouter.Params, _ []byte) (interface{}, error) {
	return false, nil
}

type loginForm struct {
	Username string
	Password string
}

func checkAuth(_ httprouter.Params, body []byte) (interface{}, error) {
	var lf loginForm
	if err := json.Unmarshal(body, &lf); err != nil {
		return nil, err
	}

	if r, err := http.NewRequest("GET", "https://owncloud.srs.epita.fr/remote.php/webdav/", nil); err != nil {
		return nil, err
	} else {
		r.SetBasicAuth(lf.Username, lf.Password)

		if resp, err := http.DefaultClient.Do(r); err != nil {
			return nil, err
		} else {
			defer resp.Body.Close()

			if resp.StatusCode == http.StatusOK {
				var std Student
				if !studentExists(lf.Username) {
					if std, err = NewStudent(lf.Username); err != nil {
						return nil, err
					}
				} else if std, err = getStudentByLogin(lf.Username); err != nil {
					return nil, err
				}

				session, err := std.NewSession()
				if err != nil {
					return nil, err
				}

				res := map[string]interface{}{}
				res["status"] = "OK"
				res["id_session"] = session.Id

				return res, nil
			} else {
				return nil, errors.New(`{"status": "Invalid username or password"}`)
			}
		}

		return nil, nil
	}
}