package proxy

import (
	"context"
	"fmt"
	"log"
	"net"
	"net/http"

	"forge.cadoles.com/Cadoles/go-proxy"
	bouncerChi "forge.cadoles.com/cadoles/bouncer/internal/chi"
	"forge.cadoles.com/cadoles/bouncer/internal/config"
	"forge.cadoles.com/cadoles/bouncer/internal/proxy/director"
	"forge.cadoles.com/cadoles/bouncer/internal/store"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/pkg/errors"
	"gitlab.com/wpetit/goweb/logger"
)

type Server struct {
	serverConfig    config.ProxyServerConfig
	redisConfig     config.RedisConfig
	directorLayers  []director.Layer
	proxyRepository store.ProxyRepository
	layerRepository store.LayerRepository
}

func (s *Server) Start(ctx context.Context) (<-chan net.Addr, <-chan error) {
	errs := make(chan error)
	addrs := make(chan net.Addr)

	go s.run(ctx, addrs, errs)

	return addrs, errs
}

func (s *Server) run(parentCtx context.Context, addrs chan net.Addr, errs chan error) {
	defer func() {
		close(errs)
		close(addrs)
	}()

	ctx, cancel := context.WithCancel(parentCtx)
	defer cancel()

	if err := s.initRepositories(ctx); err != nil {
		errs <- errors.WithStack(err)

		return
	}

	listener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", s.serverConfig.HTTP.Host, s.serverConfig.HTTP.Port))
	if err != nil {
		errs <- errors.WithStack(err)

		return
	}

	addrs <- listener.Addr()

	defer func() {
		if err := listener.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
			errs <- errors.WithStack(err)
		}
	}()

	go func() {
		<-ctx.Done()

		if err := listener.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
			log.Printf("%+v", errors.WithStack(err))
		}
	}()

	router := chi.NewRouter()

	logger.Info(ctx, "http server listening")

	director := director.New(
		s.proxyRepository,
		s.layerRepository,
		s.directorLayers...,
	)

	router.Use(middleware.RequestLogger(bouncerChi.NewLogFormatter()))
	router.Use(director.Middleware())

	handler := proxy.New(
		proxy.WithRequestTransformers(
			director.RequestTransformer(),
		),
		proxy.WithResponseTransformers(
			director.ResponseTransformer(),
		),
	)

	router.Handle("/*", handler)

	if err := http.Serve(listener, router); err != nil && !errors.Is(err, net.ErrClosed) {
		errs <- errors.WithStack(err)
	}

	logger.Info(ctx, "http server exiting")
}

func NewServer(funcs ...OptionFunc) *Server {
	opt := defaultOption()
	for _, fn := range funcs {
		fn(opt)
	}

	return &Server{
		serverConfig:   opt.ServerConfig,
		redisConfig:    opt.RedisConfig,
		directorLayers: opt.DirectorLayers,
	}
}