// Copyright (C) 2023 Marius Schellenberger

package api

import (
	"context"
	"net"
	"net/http"
	"time"

	"git.giftfish.de/ston1th/keyctl/pkg/api/types"
	serverv1 "git.giftfish.de/ston1th/keyctl/pkg/api/v1/server"
	"git.giftfish.de/ston1th/keyctl/pkg/db"

	"github.com/go-logr/logr"
	"github.com/gorilla/mux"
)

// Server is the webapp and api server
type Server struct {
	srv *http.Server
	mux *mux.Router
	log logr.Logger

	Data *types.ContextData

	init         chan struct{}
	stop         chan struct{}
	stopKeyReset chan struct{}

	listen net.Listener

	db *db.DB
}

type notFoundHandler struct {
	s *Server
}

func (nf *notFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	types.NewContext(w, r, nf.s.Data, nf.s.log).Err(types.ErrInvalidAPIRoute)
}

// NewHTTPServer returns a new HTTPServer
func NewServer(log logr.Logger, listen string) (*Server, error) {
	s := &Server{
		mux:  mux.NewRouter(),
		log:  log,
		Data: &types.ContextData{},

		init:         make(chan struct{}),
		stop:         make(chan struct{}),
		stopKeyReset: make(chan struct{}),
	}
	l, err := net.Listen("tcp", listen)
	if err != nil {
		return nil, err
	}
	s.listen = l

	s.mux.NotFoundHandler = &notFoundHandler{s}
	for _, v := range serverv1.Routes {
		s.mux.HandleFunc(v.Path, s.contextWrapper(v.Handler)).Methods(v.Methods...)
	}
	s.start()
	return s, nil
}

func (s *Server) start() {
	s.srv = &http.Server{
		Handler:      s.mux,
		ReadTimeout:  10 * time.Second,
		WriteTimeout: 10 * time.Second,
	}
	go func() {
		<-s.init
		err := s.srv.Serve(s.listen)
		if err != nil {
			s.log.Error(err, "")
		}
	}()
	return
}

func (s *Server) contextWrapper(h types.CtxHandler) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		h(types.NewContext(w, r, s.Data, s.log))
	}
}

// Stop stops listening for incoming connections and closes currently open connections
func (s *Server) Stop() {
	s.log.Info("stopping")
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	defer cancel()
	err := s.srv.Shutdown(ctx)
	if err != nil {
		s.log.Error(err, "")
	}
	s.log.Info("stopped")
}