package controllers

import (
	"net/http"

	"git.kirsle.net/apps/gophertype/pkg/authentication"
	"git.kirsle.net/apps/gophertype/pkg/console"
	"git.kirsle.net/apps/gophertype/pkg/constants"
	"git.kirsle.net/apps/gophertype/pkg/glue"
	"git.kirsle.net/apps/gophertype/pkg/models"
	"git.kirsle.net/apps/gophertype/pkg/ratelimit"
	"git.kirsle.net/apps/gophertype/pkg/responses"
	"git.kirsle.net/apps/gophertype/pkg/session"
	"github.com/albrow/forms"
)

func init() {
	glue.Register(glue.Endpoint{
		Path:    "/login",
		Methods: []string{"GET", "POST"},
		Handler: func(w http.ResponseWriter, r *http.Request) {
			// Template variables.
			v := responses.NewTemplateVars(w, r)

			// POST handler: create the admin account.
			for r.Method == http.MethodPost {
				form, _ := forms.Parse(r)
				v.FormValues = form.Values

				// Validate form parameters.
				val := form.Validator()
				val.Require("email")
				val.MatchEmail("email")
				val.Require("password")
				if val.HasErrors() {
					v.ValidationError = val.ErrorMap()
					break
				}

				// Rate limit failed login attempts.
				limiter := &ratelimit.Limiter{
					Namespace:  "login",
					ID:         form.Get("email"),
					Limit:      constants.LoginRateLimit,
					Window:     constants.LoginRateLimitWindow,
					CooldownAt: constants.LoginRateLimitCooldownAt,
					Cooldown:   constants.LoginRateLimitCooldown,
				}

				// Check authentication.
				user, err := models.Users.AuthenticateUser(form.Get("email"), form.Get("password"))
				if err != nil {
					if err := limiter.Ping(); err != nil {
						v.Error = err
						break
					}
					v.Error = err
					break
				}

				if err := limiter.Clear(); err != nil {
					console.Error("Failed to clear the login rate limiter: %s", err)
				}

				_ = user

				authentication.Login(w, r, user)
				session.Flash(w, r, "Signed in!")
				responses.Redirect(w, r, "/") // TODO: next URL
				return
			}

			responses.RenderTemplate(w, r, "_builtin/users/login.gohtml", v)
		},
	})

	glue.Register(glue.Endpoint{
		Path: "/logout",
		Handler: func(w http.ResponseWriter, r *http.Request) {
			authentication.Logout(w, r)
			session.Flash(w, r, "Signed out!")
			responses.Redirect(w, r, "/")
		},
	})
}