package api

import (
	"context"
	stdtls "crypto/tls"
	"net"
	"net/http"
	"time"

	"git.giftfish.de/ston1th/haproxy-lb/pkg/alloc"
	"git.giftfish.de/ston1th/haproxy-lb/pkg/api/types"
	serverv1 "git.giftfish.de/ston1th/haproxy-lb/pkg/api/v1/server"
	"git.giftfish.de/ston1th/haproxy-lb/pkg/config"
	"git.giftfish.de/ston1th/haproxy-lb/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

	Alloc *alloc.Alloc
	DB    *db.DB
	cidrs []string
	gw    string
	Auth  []config.BasicAuth

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

	cert  string
	key   string
	laddr string
}

type notFoundHandler struct {
	s *Server
}

func (nf *notFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	types.NewContext(w, r, nf.s).NotFound()
}

// NewHTTPServer returns a new HTTPServer
func NewServer(c *config.Config, log logr.Logger) *Server {
	s := &Server{
		mux:   mux.NewRouter(),
		log:   log.WithName("api"),
		cidrs: c.VIP.VirtualIPs,
		gw:    c.VIP.Gateway,
		Auth:  c.Server.BasicAuth,

		init:         make(chan struct{}),
		stop:         make(chan struct{}),
		stopKeyReset: make(chan struct{}),

		cert:  c.Server.TLS.Cert,
		key:   c.Server.TLS.Key,
		laddr: c.Server.Listen,
	}
	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
}

func (s *Server) UpdateDB(db *db.DB) error {
	s.db = db
	if s.Alloc == nil {
		alloc, err := alloc.NewAlloc(db, s.cidrs, s.gw)
		if err != nil {
			return err
		}
		s.alloc = alloc
		close(s.init)
	} else {
		s.Alloc.UpdateDB(db)
	}
	return nil
}

func (s *Server) start() error {
	<-s.init
	l, err := net.Listen("tcp", h.laddr)
	if err != nil {
		return err
	}
	// TODO tls config
	h.srv = &http.Server{
		Handler:      h.mux,
		TLSConfig:    cfg,
		ReadTimeout:  10 * time.Second,
		WriteTimeout: 10 * time.Second,
	}
	go func() {
		err := h.srv.Serve(l)
		if err != nil {
			s.log.Error(err, "")
		}
	}()
	return nil
}

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

// 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 := h.srv.Shutdown(ctx)
	if err != nil {
		s.log.Error(err, "")
	}
	s.log.Info("stopped")
}