package Auth

import (
	"encoding/json"
	"io/ioutil"
	"log"
	"net/http"

	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Api/JsonSerialization"
	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Database"
	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Models"
)

type signupResponse struct {
	Status  string `json:"status"`
	Message string `json:"message"`
}

func makeSignupResponse(w http.ResponseWriter, code int, message string) {
	var (
		status     string = "error"
		returnJson []byte
		err        error
	)
	if code > 200 && code < 300 {
		status = "success"
	}

	returnJson, err = json.MarshalIndent(signupResponse{
		Status:  status,
		Message: message,
	}, "", "  ")
	if err != nil {
		http.Error(w, "Error", http.StatusInternalServerError)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	// Return updated json
	w.WriteHeader(code)
	w.Write(returnJson)

}

func Signup(w http.ResponseWriter, r *http.Request) {
	var (
		userData    Models.User
		requestBody []byte
		err         error
	)

	requestBody, err = ioutil.ReadAll(r.Body)
	if err != nil {
		log.Printf("Error encountered reading POST body: %s\n", err.Error())
		makeSignupResponse(w, http.StatusInternalServerError, "An error occurred")
		return
	}

	userData, err = JsonSerialization.DeserializeUser(requestBody, []string{
		"id",
	}, false)
	if err != nil {
		log.Printf("Invalid data provided to Signup: %s\n", err.Error())
		makeSignupResponse(w, http.StatusUnprocessableEntity, "Invalid data provided")
		return
	}

	if userData.Username == "" ||
		userData.Password == "" ||
		userData.ConfirmPassword == "" ||
		len(userData.AsymmetricPrivateKey) == 0 ||
		len(userData.AsymmetricPublicKey) == 0 {
		makeSignupResponse(w, http.StatusUnprocessableEntity, "Invalid data provided")
		return
	}

	err = Database.CheckUniqueUsername(userData.Username)
	if err != nil {
		makeSignupResponse(w, http.StatusUnprocessableEntity, "Invalid data provided")
		return
	}

	userData.Password, err = HashPassword(userData.Password)
	if err != nil {
		makeSignupResponse(w, http.StatusInternalServerError, "An error occurred")
		return
	}

	err = Database.CreateUser(&userData)
	if err != nil {
		makeSignupResponse(w, http.StatusInternalServerError, "An error occurred")
		return
	}

	makeSignupResponse(w, http.StatusCreated, "Successfully signed up")
}