package handlers

import (
	"encoding/json"
	"net/http"

	"server/database"
	"server/helper"
)

type loginRequest struct {
	Email    string
	Password string
}

func Login(writer http.ResponseWriter, request *http.Request) {
	if request.Method != "POST" {
		helper.WriteErrorJson("expected POST method", writer, http.StatusBadRequest)
		return
	}

	var login_request loginRequest
	err := json.NewDecoder(request.Body).Decode(&login_request)
	if err != nil {
		helper.WriteErrorJson(err.Error(), writer, http.StatusBadRequest)
		return
	}

	user, err := database.MaybeGetUser(login_request.Email)
	if err != nil {
		helper.WriteInternalErrorJson(err, writer)
		return
	}
	if user == nil {
		helper.WriteErrorJson("incorrect email or password", writer, http.StatusForbidden)
		return
	}

	hash, err := helper.GenerateHash(login_request.Password, user.Password_salt)
	if err != nil {
		helper.WriteInternalErrorJson(err, writer)
		return
	}
	if hash != user.Password_hash {
		helper.WriteErrorJson("incorrect email or password", writer, http.StatusForbidden)
		return
	}

	// Login is successful, issue a valid jwt.
	err = helper.IssueToken(user.Uid, writer)
	if err != nil {
		helper.WriteInternalErrorJson(err, writer)
		return
	}
}