package controllers

import (
	"net/http"
	"rate-it-api/models"
	"rate-it-api/utils"
	"time"

	"github.com/auth0/go-jwt-middleware"
	"github.com/dgrijalva/jwt-go"
	"golang.org/x/crypto/bcrypt"
)

// AuthToken return a JWT token
func AuthToken(w http.ResponseWriter, r *http.Request) {

	r.ParseForm()

	user, err := models.UserGetByEmail(r.Form.Get("email"))

	if err != nil {

		utils.SendJSONErrorResponse(w, "This user doesn't exist", http.StatusBadRequest)
		return
	}

	if user.Verify != 1 {

		utils.SendJSONErrorResponse(w, "Email must be verify", http.StatusUnauthorized)
		return
	}

	password := r.Form.Get("password")

	err = bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password))

	if err != nil {

		utils.SendJSONErrorResponse(w, "Invalid password", http.StatusUnauthorized)
		return
	}

	/* Create the token */
	token := jwt.New(jwt.SigningMethodHS256)
	config := utils.GetConfig()

	/* Set token claims */
	claims := make(jwt.MapClaims)
	claims["email"] = user.Email
	claims["expiresAt "] = time.Now().Add(time.Duration(config.JWT.Expiration)).Unix()

	token.Claims = claims

	/* Sign the token with our secret */
	tokenString, _ := token.SignedString([]byte(config.JWT.Secret))
	tokenResponse := utils.TokenResponseStruct{
		Token:      tokenString,
		Expiration: config.JWT.Expiration / (1000 * 1000 * 1000),
	}

	/* Finally, write the token to the browser window */
	utils.SendJSONTokenAcknowledgeResponse(w, tokenResponse, http.StatusOK)
}

func jwtErrorHandler(w http.ResponseWriter, r *http.Request, err string) {

	utils.SendJSONErrorResponse(w, err, http.StatusUnauthorized)
}

// JwtMiddleware check JWT signature
var JwtMiddleware = jwtmiddleware.New(jwtmiddleware.Options{
	ValidationKeyGetter: func(token *jwt.Token) (interface{}, error) {
		config := utils.GetConfig()
		return []byte(config.JWT.Secret), nil
	},
	// When set, the middleware verifies that tokens are signed with the specific signing algorithm
	// If the signing method is not constant the ValidationKeyGetter callback can be used to implement additional checks
	// Important to avoid security issues described here: https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/
	SigningMethod: jwt.SigningMethodHS256,
	ErrorHandler:  jwtErrorHandler,
})