package router

import (
	"context"
	"net/http"

	"code.gitea.io/sdk/gitea"
	"github.com/gorilla/sessions"
	"github.com/markbates/goth/gothic"
)

const sessionCookie = "_invitea_session"

type SessionStore struct {
	Store    sessions.Store
	GiteaURL string
}

func (s *SessionStore) Middleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		sess, err := s.Store.Get(r, sessionCookie)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		r = r.WithContext(context.WithValue(r.Context(), "isAdmin", sess.Values["isAdmin"]))
		r = r.WithContext(context.WithValue(r.Context(), "username", sess.Values["username"]))
		next.ServeHTTP(w, r)
	})
}

func (s *SessionStore) RequireAuth(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		sess, err := s.Store.Get(r, sessionCookie)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if _, ok := sess.Values["authenticated"]; !ok {
			gothic.BeginAuthHandler(w, r)
			return
		}

		next.ServeHTTP(w, r)
	})
}

func (s *SessionStore) Auth(w http.ResponseWriter, r *http.Request, token string) error {
	client, err := gitea.NewClient(s.GiteaURL, gitea.SetToken(token))
	if err != nil {
		return err
	}
	profile, _, err := client.GetMyUserInfo()
	if err != nil {
		return err
	}

	sess, err := s.Store.New(r, sessionCookie)
	if err != nil {
		return err
	}
	sess.Values["authenticated"] = true
	sess.Values["isAdmin"] = profile.IsAdmin
	sess.Values["username"] = profile.UserName
	return s.Store.Save(r, w, sess)
}

func (s *SessionStore) Logout(w http.ResponseWriter, r *http.Request) error {
	sess, err := s.Store.Get(r, sessionCookie)
	if err != nil {
		return err
	}
	sess.Options.MaxAge = -1
	return s.Store.Save(r, w, sess)
}

func NewSessionStore(sessionSecret, giteURL string) *SessionStore {
	store := sessions.NewCookieStore([]byte(sessionSecret))
	store.MaxAge(0)
	return &SessionStore{
		Store:    store,
		GiteaURL: giteURL,
	}
}