package hwsauth

import (
	"net/http"
	"time"

	"git.haelnorr.com/h/golib/hws"
	"github.com/pkg/errors"
)

// LoginReq returns a middleware that requires the user to be authenticated.
// If the user is not authenticated, it returns a 401 Unauthorized error page.
//
// Example:
//
//	protectedHandler := auth.LoginReq(http.HandlerFunc(dashboardHandler))
//	server.AddRoute("GET", "/dashboard", protectedHandler)
func (auth *Authenticator[T, TX]) LoginReq(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, ok := getAuthorizedModel[T](r.Context())
		if !ok {
			auth.server.ThrowError(w, r, hws.HWSError{
				Error:           errors.New("Login required"),
				Message:         "Please login to view this page",
				StatusCode:      http.StatusUnauthorized,
				RenderErrorPage: true,
			})
			return
		}
		next.ServeHTTP(w, r)
	})
}

// LogoutReq returns a middleware that redirects authenticated users to the landing page.
// Use this for login and registration pages to prevent logged-in users from accessing them.
//
// Example:
//
//	loginPageHandler := auth.LogoutReq(http.HandlerFunc(showLoginPage))
//	server.AddRoute("GET", "/login", loginPageHandler)
func (auth *Authenticator[T, TX]) LogoutReq(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, ok := getAuthorizedModel[T](r.Context())
		if ok {
			http.Redirect(w, r, auth.LandingPage, http.StatusFound)
			return
		}
		next.ServeHTTP(w, r)
	})
}

// FreshReq returns a middleware that requires a fresh authentication token.
// If the token is not fresh (recently issued), it returns a 444 status code.
// Use this for sensitive operations like password changes or account deletions.
//
// Example:
//
//	changePasswordHandler := auth.FreshReq(http.HandlerFunc(handlePasswordChange))
//	server.AddRoute("POST", "/change-password", changePasswordHandler)
//
// The 444 status code can be used by the client to prompt for re-authentication.
func (auth *Authenticator[T, TX]) FreshReq(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		model, ok := getAuthorizedModel[T](r.Context())
		if !ok {
			auth.server.ThrowError(w, r, hws.HWSError{
				Error:           errors.New("Login required"),
				Message:         "Please login to view this page",
				StatusCode:      http.StatusUnauthorized,
				RenderErrorPage: true,
			})
			return
		}
		isFresh := time.Now().Before(time.Unix(model.fresh, 0))
		if !isFresh {
			w.WriteHeader(444)
			return
		}
		next.ServeHTTP(w, r)
	})
}