package service

import (
	"crypto/rand"
	"database/sql"
	"log"
	"net/http"
	"net/mail"
	"strings"

	"me-fit/template"
	"me-fit/template/auth"

	"github.com/google/uuid"
	"golang.org/x/crypto/argon2"
)

func SignInPage(w http.ResponseWriter, r *http.Request) {
	signIn := auth.SignInOrUp(true)
	template.Layout(signIn).Render(r.Context(), w)
}

func SignUpPage(w http.ResponseWriter, r *http.Request) {
	signIn := auth.SignInOrUp(false)
	template.Layout(signIn).Render(r.Context(), w)
}

func SignUp(db *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {

	}
}

// var (
// 	metricsAuthSignUp = promauto.NewCounterVec(
// 		prometheus.CounterOpts{
// 			Name: "mefit_api_auth_signup_total",
// 			Help: "The total number of auth signup api requests processed",
// 		},
// 		[]string{"result"},
// 	)
//
// 	metricsError = promauto.NewCounterVec(
// 		prometheus.CounterOpts{
// 			Name: "mefit_api_error_total",
// 			Help: "The total number of errors",
// 		},
// 		[]string{"result"},
// 	)
//
// 	// metricsAuthSignIn = promauto.NewCounterVec(
// 	// 	prometheus.CounterOpts{
// 	// 		Name: "mefit_api_auth_signin_total",
// 	// 	},
// 	// 	[]string{"result"},
// 	// )
//
// 	privateKey = func() *ecdsa.PrivateKey {
// 		keyBase64 := os.Getenv("PRIVATE_KEY")
// 		if keyBase64 == "" {
// 			log.Fatal("PRIVATE_KEY not defined")
// 		}
// 		keyData, err := base64.StdEncoding.DecodeString(keyBase64)
// 		if err != nil {
// 			log.Fatalf("Could not decode private key: %v", err)
// 		}
// 		key, err := x509.ParseECPrivateKey(keyData)
// 		if err != nil {
// 			log.Fatalf("Could not parse private key: %v", err)
// 		}
// 		log.Println("Successfully imported private key")
// 		return key
// 	}()
// )

func PostSignup(db *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {

		var email = r.FormValue("email")
		var password = r.FormValue("password")

		_, err := mail.ParseAddress(email)
		if err != nil {
			http.Error(w, "Invalid email", http.StatusBadRequest)
			return
		}

		if len(password) < 8 ||
			!strings.ContainsAny(password, "0123456789") ||
			!strings.ContainsAny(password, "ABCDEFGHIJKLMNOPQRSTUVWXYZ") ||
			!strings.ContainsAny(password, "abcdefghijklmnopqrstuvwxyz") ||
			!strings.ContainsAny(password, "!@#$%^&*()_+-=[]{}\\|;:'\",.<>/?") {
			http.Error(w, "Password needs to be 8 characters long, contain at least one number, one special, one uppercase and one lowercase character", http.StatusBadRequest)
			return
		}

		user_uuid, err := uuid.NewRandom()
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			log.Printf("Could not generate UUID: %v", err)
			return
		}

		salt := make([]byte, 16)
		rand.Read(salt)

		hash := argon2.IDKey([]byte(password), salt, 1, 64*1024, 1, 16)

		_, err = db.Exec("INSERT INTO user (user_uuid, email, email_verified, is_admin, password, salt, created_at) VALUES (?, ?, FALSE, FALSE, ?, ?, datetime())", user_uuid, email, hash, salt)
		if err != nil {
			if strings.Contains(err.Error(), "email") {
				http.Error(w, "Email already exists", http.StatusBadRequest)
				return
			}

			http.Error(w, err.Error(), http.StatusInternalServerError)
			log.Printf("Could not insert user: %v", err)
			return
		}

		w.WriteHeader(http.StatusOK)
		// w.Write([]byte(token))
	}
}