package Api

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

	"git.tovijaeschke.xyz/tovi/SuddenImpactRecords/Api/Auth"
	"git.tovijaeschke.xyz/tovi/SuddenImpactRecords/Api/JsonSerialization"
	"git.tovijaeschke.xyz/tovi/SuddenImpactRecords/Database"
	"git.tovijaeschke.xyz/tovi/SuddenImpactRecords/Models"
	"git.tovijaeschke.xyz/tovi/SuddenImpactRecords/Util"
)

func getUsers(w http.ResponseWriter, r *http.Request) {
	var (
		users          []Models.User
		returnJson     []byte
		values         url.Values
		page, pageSize int
		err            error
	)

	_, err = Auth.CheckCookie(r)
	if err != nil {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	values = r.URL.Query()

	page, err = strconv.Atoi(values.Get("page"))
	if err != nil {
		log.Println("Could not parse page url argument")
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	page, err = strconv.Atoi(values.Get("pageSize"))
	if err != nil {
		log.Println("Could not parse pageSize url argument")
		Util.JsonReturn(w, 500, "An error occured")
		return
	}
	users, err = Database.GetUsers(page, pageSize)
	if err != nil {
		log.Printf("An error occured: %s\n", err.Error())
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	returnJson, err = json.MarshalIndent(users, "", "  ")
	if err != nil {
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	// Return updated json
	w.WriteHeader(http.StatusOK)
	w.Write(returnJson)
}

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

	_, err = Auth.CheckCookie(r)
	if err != nil {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	userData, err = Util.GetUserById(w, r)
	if err != nil {
		return
	}

	returnJson, err = json.MarshalIndent(userData, "", "  ")
	if err != nil {
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	// Return updated json
	w.WriteHeader(http.StatusOK)
	w.Write(returnJson)
}

func createUser(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())
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	userData, err = JsonSerialization.DeserializeUser(requestBody, []string{
		"id",
		"last_login",
	}, false)
	if err != nil {
		log.Printf("Invalid data provided to user API: %s\n", err.Error())
		Util.JsonReturn(w, 405, "Invalid data")
		return
	}

	err = Database.CheckUniqueEmail(userData.Email)
	if err != nil {
		Util.JsonReturn(w, 405, "invalid_email")
		return
	}

	if userData.Password != userData.ConfirmPassword {
		Util.JsonReturn(w, 405, "invalid_password")
		return
	}

	userData.Password, err = Auth.HashPassword(userData.Password)
	if err != nil {
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	err = Database.CreateUser(&userData)
	if err != nil {
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	// Return updated json
	w.WriteHeader(http.StatusOK)
}

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

	currentUserData, err = Auth.CheckCookieCurrentUser(w, r)
	if err != nil {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	requestBody, err = ioutil.ReadAll(r.Body)
	if err != nil {
		log.Printf("Error encountered reading POST body: %s\n", err.Error())
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	userData, err = JsonSerialization.DeserializeUser(requestBody, []string{}, true)
	if err != nil {
		log.Printf("Invalid data provided to users API: %s\n", err.Error())
		Util.JsonReturn(w, 405, "Invalid data")
		return
	}

	err = Database.UpdateUser(currentUserData.ID.String(), &userData)
	if err != nil {
		log.Printf("An error occured: %s\n", err.Error())
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	returnJson, err = json.MarshalIndent(userData, "", "  ")
	if err != nil {
		log.Printf("An error occured: %s\n", err.Error())
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	// Return updated json
	w.WriteHeader(http.StatusOK)
	w.Write(returnJson)
}

func deleteUser(w http.ResponseWriter, r *http.Request) {
	var (
		userData Models.User
		err      error
	)

	_, err = Auth.CheckCookie(r)
	if err != nil {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	userData, err = Util.GetUserById(w, r)
	if err != nil {
		w.WriteHeader(http.StatusNotFound)
		return
	}

	err = Database.DeleteUser(&userData)
	if err != nil {
		log.Printf("An error occured: %s\n", err.Error())
		Util.JsonReturn(w, 500, "An error occured")
		return
	}

	// Return updated json
	w.WriteHeader(http.StatusOK)
}