package server

import (
	"fmt"
	"net"
	"net/http"
	"os"
	"strings"

	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"
	"github.com/urfave/cli/v2"

	"pages-server/config"
	"pages-server/server/cache"
	"pages-server/server/gitea"
	"pages-server/server/handler"
)

// Serve sets up and starts the web server.
func Serve(ctx *cli.Context) error {
	// initialize logger with Trace, overridden later with actual level
	log.Logger = zerolog.New(zerolog.ConsoleWriter{Out: os.Stderr}).With().Timestamp().Logger().Level(zerolog.TraceLevel)

	cfg, err := config.ReadConfig(ctx)
	if err != nil {
		log.Error().Err(err).Msg("could not read config")
	}

	config.MergeConfig(ctx, cfg)

	// Initialize the logger.
	logLevel, err := zerolog.ParseLevel(cfg.LogLevel)
	if err != nil {
		return err
	}
	log.Logger = zerolog.New(zerolog.ConsoleWriter{Out: os.Stderr}).With().Timestamp().Logger().Level(logLevel)

	listeningHTTPAddress := fmt.Sprintf("%s:%d", cfg.Server.Host, cfg.Server.Port)

	if cfg.Server.RawDomain != "" {
		cfg.Server.AllowedCorsDomains = append(cfg.Server.AllowedCorsDomains, cfg.Server.RawDomain)
	}

	// Make sure MainDomain has a leading dot
	if !strings.HasPrefix(cfg.Server.MainDomain, ".") {
		// TODO make this better
		cfg.Server.MainDomain = "." + cfg.Server.MainDomain
	}

	if len(cfg.Server.PagesBranches) == 0 {
		return fmt.Errorf("no default branches set (PAGES_BRANCHES)")
	}

	// canonicalDomainCache stores canonical domains
	canonicalDomainCache := cache.NewInMemoryCache()
	// redirectsCache stores redirects in _redirects files
	redirectsCache := cache.NewInMemoryCache()
	// clientResponseCache stores responses from the Gitea server
	clientResponseCache := cache.NewInMemoryCache()

	giteaClient, err := gitea.NewClient(cfg.Forge, clientResponseCache)
	if err != nil {
		return fmt.Errorf("could not create new gitea client: %v", err)
	}

	// Create listener
	log.Info().Msgf("Create TCP listener on %s", listeningHTTPAddress)
	listener, err := net.Listen("tcp", listeningHTTPAddress)
	if err != nil {
		return fmt.Errorf("couldn't create listener: %v", err)
	}

	// // Create listener for http and start listening
	// go func() {
	// 	log.Info().Msgf("Start HTTP server listening on %s", listeningHTTPAddress)
	// 	err := http.ListenAndServe(listeningHTTPAddress, nil)
	// 	if err != nil {
	// 		log.Error().Err(err).Msg("Couldn't start HTTP server")
	// 	}
	// }()

	if ctx.IsSet("enable-profiling") {
		StartProfilingServer(ctx.String("profiling-address"))
	}

	// Create handler based on settings
	httpHandler := handler.Handler(cfg.Server, giteaClient, canonicalDomainCache, redirectsCache)

	// Start the listener
	log.Info().Msgf("Start server using TCP listener on %s", listener.Addr())

	return http.Serve(listener, httpHandler)
}