package sessions

import (
	"context"
	"net/http"
)

func StartSession(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// is there a session_token cookie?
		scookie, err := r.Cookie("session_token")
		if err != nil || scookie.Value == "" {
			// no session value or cookie
			next.ServeHTTP(w, r)
			return
		}
		// check for existing session
		cvalue := scookie.Value
		vsession, ok := GetSession(cvalue)
		if !ok {
			// no session
			next.ServeHTTP(w, r)
			return
		}
		// set session
		ctx := context.WithValue(r.Context(), SessionCtxKey("session"), vsession)
		next.ServeHTTP(w, r.WithContext(ctx))
	})
}

func GuestSession(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// if SessionKey does exist then redirect to `/u/me` as this is an auth session
		if v := r.Context().Value(SessionCtxKey("session")); v != nil {
			http.Redirect(w, r, "/u/me", http.StatusSeeOther)
			return
		}
		// else this is a valid guest request
		next.ServeHTTP(w, r)
	})
}

func AuthSession(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// if session key exists then this is a valid auth request
		if v := r.Context().Value(SessionCtxKey("session")); v != nil {
			next.ServeHTTP(w, r)
			return
		}

		// else this is a guest session request, redirect to login
		http.Redirect(w, r, "/u/auth", http.StatusSeeOther)
	})
}