package api

import (
	"encoding/json"
	"fmt"
	"github.com/google/uuid"
	"go-nkode/models"
	"net/http"
)

const (
	CreateNewCustomer       = "/create-new-customer"
	GenerateSignupInterface = "/generate-signup-interface"
	SetNKode                = "/set-nkode"
	ConfirmNKode            = "/confirm-nkode"
	GetLoginInterface       = "/get-login-interface"
	Login                   = "/login"
	RenewAttributes         = "/renew-attributes"
)

type NKodeHandler struct {
	Api NKodeAPI
}

type NewCustomerPost struct {
	KeypadSize  models.KeypadSize  `json:"keypad_size"`
	NKodePolicy models.NKodePolicy `json:"nkode_policy"`
}

type GenerateSignupInterfacePost struct {
	CustomerId uuid.UUID `json:"customer_id"`
}

type SetNKodePost struct {
	Username     string    `json:"username"`
	CustomerId   uuid.UUID `json:"customer_id"`
	KeySelection []int     `json:"key_selection"`
	SessionId    uuid.UUID `json:"session_id"`
}

type ConfirmNKodePost struct {
	CustomerId   uuid.UUID `json:"customer_id"`
	KeySelection []int     `json:"key_selection"`
	SessionId    uuid.UUID `json:"session_id"`
}

type GetLoginInterfacePost struct {
	Username   string    `json:"username"`
	CustomerId uuid.UUID `json:"customer_id"`
}

type LoginPost struct {
	CustomerId   uuid.UUID `json:"customer_id"`
	Username     string    `json:"username"`
	KeySelection []int     `json:"key_selection"`
}

type RenewAttributesPost struct {
	CustomerId uuid.UUID `json:"customer_id"`
}

func (h *NKodeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	switch r.URL.Path {
	case CreateNewCustomer:
		h.CreateNewCustomerHandler(w, r)
		return
	case GenerateSignupInterface:
		h.GenerateSignupInterfaceHandler(w, r)
	case SetNKode:
		if r.Method != http.MethodPost {
			methodNotAllowed(w)
			return
		}
		h.SetNKodeHandler(w, r)
	case ConfirmNKode:

		if r.Method != http.MethodPost {
			methodNotAllowed(w)
			return
		}
	case GetLoginInterface:
		if r.Method != http.MethodPost {
			methodNotAllowed(w)
			return
		}

	case Login:
		if r.Method != http.MethodPost {
			methodNotAllowed(w)
			return
		}

	case RenewAttributes:
		if r.Method != http.MethodPost {
			methodNotAllowed(w)
			return
		}

	default:
		w.WriteHeader(http.StatusNotFound)
		w.Write([]byte("404 not found"))
	}
}

func internalServerErrorHandler(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusInternalServerError)
	w.Write([]byte("500 Internal Server Error"))
}

func methodNotAllowed(w http.ResponseWriter) {
	w.WriteHeader(http.StatusMethodNotAllowed)
	w.Write([]byte("405 method not allowed"))
}

func (h *NKodeHandler) CreateNewCustomerHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	var customerPost NewCustomerPost

	if err := json.NewDecoder(r.Body).Decode(&customerPost); err != nil {
		internalServerErrorHandler(w, r)
		return
	}
	customerId, err := h.Api.CreateNewCustomer(customerPost.KeypadSize, customerPost.NKodePolicy)
	if err != nil {
		internalServerErrorHandler(w, r)
		return
	}
	data := map[string]interface{}{
		"customer_id": customerId,
	}
	jsonBytes, err := json.Marshal(data)

	w.WriteHeader(http.StatusOK)
	w.Write(jsonBytes)
}

func (h *NKodeHandler) GenerateSignupInterfaceHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}

	var signupPost GenerateSignupInterfacePost
	if err := json.NewDecoder(r.Body).Decode(&signupPost); err != nil {
		internalServerErrorHandler(w, r)
		return
	}
	fmt.Println("Customer Id: ", signupPost.CustomerId)
}

func (h *NKodeHandler) SetNKodeHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
}