package v1

import (
	"code.vikunja.io/api/pkg/models"
	"code.vikunja.io/api/pkg/routes/crud"
	"crypto/md5"
	"encoding/hex"
	"github.com/dgrijalva/jwt-go"
	"github.com/labstack/echo"
	"github.com/spf13/viper"
	"net/http"
	"time"
)

// Token represents an authentification token
type Token struct {
	Token string `json:"token"`
}

// Login is the login handler
// @Summary Login
// @Description Logs a user in. Returns a JWT-Token to authenticate further requests.
// @tags user
// @Accept json
// @Produce json
// @Param credentials body models.UserLogin true "The login credentials"
// @Success 200 {object} v1.Token
// @Failure 400 {object} models.Message "Invalid user password model."
// @Failure 403 {object} models.Message "Invalid username or password."
// @Router /login [post]
func Login(c echo.Context) error {
	u := models.UserLogin{}
	if err := c.Bind(&u); err != nil {
		return c.JSON(http.StatusBadRequest, models.Message{"Please provide a username and password."})
	}

	// Check user
	user, err := models.CheckUserCredentials(&u)
	if err != nil {
		return crud.HandleHTTPError(err)
	}

	// Create token
	token := jwt.New(jwt.SigningMethodHS256)

	// Set claims
	claims := token.Claims.(jwt.MapClaims)
	claims["username"] = user.Username
	claims["email"] = user.Email
	claims["id"] = user.ID
	claims["exp"] = time.Now().Add(time.Hour * 72).Unix()

	avatar := md5.Sum([]byte(user.Email))
	claims["avatar"] = hex.EncodeToString(avatar[:])

	// Generate encoded token and send it as response.
	t, err := token.SignedString([]byte(viper.GetString("service.JWTSecret")))
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, Token{Token: t})
}
