package routes

import (
	"fmt"
	"github.com/gorilla/schema"
	conf "github.com/muety/wakapi/config"
	"github.com/muety/wakapi/middlewares"
	"github.com/muety/wakapi/models"
	"github.com/muety/wakapi/models/view"
	"github.com/muety/wakapi/services"
	"github.com/muety/wakapi/utils"
	"net/http"
	"net/url"
	"time"
)

type HomeHandler struct {
	config   *conf.Config
	userSrvc *services.UserService
}

var loginDecoder = schema.NewDecoder()
var signupDecoder = schema.NewDecoder()

func NewHomeHandler(userService *services.UserService) *HomeHandler {
	return &HomeHandler{
		config:   conf.Get(),
		userSrvc: userService,
	}
}

func (h *HomeHandler) GetIndex(w http.ResponseWriter, r *http.Request) {
	if h.config.IsDev() {
		loadTemplates()
	}

	if cookie, err := r.Cookie(models.AuthCookieKey); err == nil && cookie.Value != "" {
		http.Redirect(w, r, fmt.Sprintf("%s/summary", h.config.Server.BasePath), http.StatusFound)
		return
	}

	templates[conf.IndexTemplate].Execute(w, h.buildViewModel(r))
}

func (h *HomeHandler) PostLogin(w http.ResponseWriter, r *http.Request) {
	if h.config.IsDev() {
		loadTemplates()
	}

	if cookie, err := r.Cookie(models.AuthCookieKey); err == nil && cookie.Value != "" {
		http.Redirect(w, r, fmt.Sprintf("%s/summary", h.config.Server.BasePath), http.StatusFound)
		return
	}

	var login models.Login
	if err := r.ParseForm(); err != nil {
		w.WriteHeader(http.StatusBadRequest)
		templates[conf.IndexTemplate].Execute(w, h.buildViewModel(r).WithError("missing parameters"))
		return
	}
	if err := loginDecoder.Decode(&login, r.PostForm); err != nil {
		w.WriteHeader(http.StatusBadRequest)
		templates[conf.IndexTemplate].Execute(w, h.buildViewModel(r).WithError("missing parameters"))
		return
	}

	user, err := h.userSrvc.GetUserById(login.Username)
	if err != nil {
		w.WriteHeader(http.StatusNotFound)
		templates[conf.IndexTemplate].Execute(w, h.buildViewModel(r).WithError("resource not found"))
		return
	}

	// TODO: depending on middleware package here is a hack
	if !middlewares.CheckAndMigratePassword(user, &login, h.config.Security.PasswordSalt, h.userSrvc) {
		w.WriteHeader(http.StatusUnauthorized)
		templates[conf.IndexTemplate].Execute(w, h.buildViewModel(r).WithError("invalid credentials"))
		return
	}

	encoded, err := h.config.Security.SecureCookie.Encode(models.AuthCookieKey, login)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		templates[conf.IndexTemplate].Execute(w, h.buildViewModel(r).WithError("internal server error"))
		return
	}

	user.LastLoggedInAt = models.CustomTime(time.Now())
	h.userSrvc.Update(user)

	cookie := &http.Cookie{
		Name:     models.AuthCookieKey,
		Value:    encoded,
		Path:     "/",
		Secure:   !h.config.Security.InsecureCookies,
		HttpOnly: true,
	}
	http.SetCookie(w, cookie)
	http.Redirect(w, r, fmt.Sprintf("%s/summary", h.config.Server.BasePath), http.StatusFound)
}

func (h *HomeHandler) PostLogout(w http.ResponseWriter, r *http.Request) {
	if h.config.IsDev() {
		loadTemplates()
	}

	utils.ClearCookie(w, models.AuthCookieKey, !h.config.Security.InsecureCookies)
	http.Redirect(w, r, fmt.Sprintf("%s/", h.config.Server.BasePath), http.StatusFound)
}

func (h *HomeHandler) GetSignup(w http.ResponseWriter, r *http.Request) {
	if h.config.IsDev() {
		loadTemplates()
	}

	if cookie, err := r.Cookie(models.AuthCookieKey); err == nil && cookie.Value != "" {
		http.Redirect(w, r, fmt.Sprintf("%s/summary", h.config.Server.BasePath), http.StatusFound)
		return
	}

	templates[conf.SignupTemplate].Execute(w, h.buildViewModel(r))
}

func (h *HomeHandler) PostSignup(w http.ResponseWriter, r *http.Request) {
	if h.config.IsDev() {
		loadTemplates()
	}

	if cookie, err := r.Cookie(models.AuthCookieKey); err == nil && cookie.Value != "" {
		http.Redirect(w, r, fmt.Sprintf("%s/summary", h.config.Server.BasePath), http.StatusFound)
		return
	}

	var signup models.Signup
	if err := r.ParseForm(); err != nil {
		w.WriteHeader(http.StatusBadRequest)
		templates[conf.SignupTemplate].Execute(w, h.buildViewModel(r).WithError("missing parameters"))
		return
	}
	if err := signupDecoder.Decode(&signup, r.PostForm); err != nil {
		w.WriteHeader(http.StatusBadRequest)
		templates[conf.SignupTemplate].Execute(w, h.buildViewModel(r).WithError("missing parameters"))
		return
	}

	if !signup.IsValid() {
		w.WriteHeader(http.StatusBadRequest)
		templates[conf.SignupTemplate].Execute(w, h.buildViewModel(r).WithError("invalid parameters"))
		return
	}

	_, created, err := h.userSrvc.CreateOrGet(&signup)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		templates[conf.SignupTemplate].Execute(w, h.buildViewModel(r).WithError("failed to create new user"))
		return
	}
	if !created {
		w.WriteHeader(http.StatusConflict)
		templates[conf.SignupTemplate].Execute(w, h.buildViewModel(r).WithError("user already existing"))
		return
	}

	msg := url.QueryEscape("account created successfully")
	http.Redirect(w, r, fmt.Sprintf("%s/?success=%s", h.config.Server.BasePath, msg), http.StatusFound)
}

func (h *HomeHandler) buildViewModel(r *http.Request) *view.HomeViewModel {
	return &view.HomeViewModel{
		Success: r.URL.Query().Get("success"),
		Error:   r.URL.Query().Get("error"),
	}
}