package cmd

import (
	"fmt"
	"log/slog"
	"net"
	"os"
	"os/signal"
	"path/filepath"
	"runtime/debug"
	"syscall"
	"time"

	"git.oblat.lv/alex/triggerssmith/api"
	application "git.oblat.lv/alex/triggerssmith/internal/app"
	"git.oblat.lv/alex/triggerssmith/internal/config"
	"git.oblat.lv/alex/triggerssmith/internal/server"
	"git.oblat.lv/alex/triggerssmith/internal/vars"
	"github.com/spf13/cobra"
)

var optsServeCmd = struct {
	ConfigPath    *string
	Debug         *bool
	HideGreetings *bool
}{}

// // simple middleware for request logging
// func loggingMiddleware(next http.Handler) http.Handler {
// 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// 		start := time.Now()

// 		slog.Info("HTTP request",
// 			slog.String("method", r.Method),
// 			slog.String("path", r.URL.Path),
// 			slog.String("remote", r.RemoteAddr),
// 		)

// 		next.ServeHTTP(w, r)

// 		slog.Debug("HTTP request finished",
// 			slog.String("method", r.Method),
// 			slog.String("path", r.URL.Path),
// 			slog.Duration("latency", time.Since(start)),
// 		)
// 	})
// }

func writePID(path string) error {
	dir := filepath.Dir(path)
	err := os.MkdirAll(dir, 0644)
	if err != nil {
		return nil
	}
	pid := os.Getpid()

	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		return err
	}
	defer f.Close()

	_, err = fmt.Fprintf(f, "%d\n", pid)
	return err
}

var serveCmd = &cobra.Command{
	Use:   "serve",
	Short: "Start the server",
	Run: func(cmd *cobra.Command, args []string) {
		text := fmt.Sprintf(`
  _______ _____ 
 |__   __/ ____|
    | | | (___  
    | |  \___ \ 
    | |  ____) |
    |_| |_____/ 
                
 TriggerSmith - v%s                                                                  
		`, vars.Version)
		if !*optsServeCmd.HideGreetings {
			fmt.Println(text)
		}
		defer func() {
			if r := recover(); r != nil {
				slog.Debug("panic recovered: preparing panic.log", slog.Any("error", r))
				stack := debug.Stack()

				f, err := os.OpenFile("panic.log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
				if err != nil {
					slog.Error("Failed to open panic.log", slog.Any("error", err))
				} else {
					defer f.Close()
					slog.Debug("flushing stack in to panic.log")
					fmt.Fprintln(f, "\n--------------------------------------------------------\n")
					fmt.Fprintf(f, "Time: %s\n", time.Now().Format(time.RFC3339))
					fmt.Fprintln(f, "If this is unexpected, please report: https://git.oblat.lv/alex/triggerssmith/issues")
					fmt.Fprintln(f, "\n--------------------------------------------------------\n")
					fmt.Fprintf(f, "Panic: %v\n", r)
					f.Write(stack)
					f.WriteString("\n\n")
				}

				slog.Error("Application panicked: the stack is flushed to disk", slog.Any("error", r))

				os.Exit(-1)
			}
		}()

		// configure logger
		if *optsServeCmd.Debug {
			slog.SetDefault(slog.New(slog.NewTextHandler(cmd.OutOrStdout(), &slog.HandlerOptions{Level: slog.LevelDebug, AddSource: true})))
		} else {
			slog.SetDefault(slog.New(slog.NewTextHandler(cmd.OutOrStdout(), &slog.HandlerOptions{Level: slog.LevelInfo})))
		}

		pid := os.Getpid()
		slog.Debug("Starting server", slog.Int("pid", pid))
		if err := writePID(vars.PID_PATH); err != nil {
			panic(err)
		}
		slog.Debug("created pid file", slog.String("path", vars.PID_PATH))
		defer os.Remove(vars.PID_PATH)

		// load config
		slog.Debug("Reading configuration", slog.String("path", *optsServeCmd.ConfigPath))
		cfg, err := config.LoadConfig(*optsServeCmd.ConfigPath)
		if err != nil {
			slog.Error("Failed to load configuration", slog.String("path", *optsServeCmd.ConfigPath), slog.String("error", err.Error()))
			return
		}
		slog.Debug("Configuration loaded", slog.Any("config", cfg))

		// init app
		app, err := application.NewApp()
		if err != application.ErrNilPointerWarn && err != nil {
			slog.Error("Failed to create app instance", slog.String("error", err.Error()))
			return
		}
		app.LoadConfiguration(cfg)

		srv := app.Server()
		

		router := api.NewRouter(cfg)

		srv.SetHandler(router.MustRoute())
		srv.Init()

		var addr = net.JoinHostPort(cfg.Server.Addr, fmt.Sprintf("%d", cfg.Server.Port))
		slog.Debug("Binding listener", slog.String("address", addr))
		err = srv.Start(addr)
		if err != nil {
			slog.Error("Failed to start server", slog.String("error", err.Error()))
			return
		} else {
			slog.Info("Server started", slog.String("address", net.JoinHostPort(cfg.Server.Addr, fmt.Sprintf("%d", cfg.Server.Port))))
		}

		sigch := make(chan os.Signal, 1)
		signal.Notify(sigch, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
		for true {
			sig := <-sigch
			slog.Debug("got signal", slog.Any("os.Signal", sig))
			switch sig {
			case syscall.SIGHUP:
				if err := config.ReloadConfig(cfg); err != nil {
					slog.Error("Failed to reload configuration", slog.String("error", err.Error()))
				} else {
					slog.Info("Configuration reloaded")
					var addr = net.JoinHostPort(cfg.Server.Addr, fmt.Sprintf("%d", cfg.Server.Port))
					slog.Debug("New configuration", slog.Any("config", cfg))
					err = srv.Reload(addr)
					if err != nil {
						slog.Error("Failed to restart server with new configuration", slog.String("error", err.Error()))
					}
				}
			case syscall.SIGINT:
				slog.Info("Stopping server by SIGINT")
				os.Remove(vars.PID_PATH)
				_ = server.StopAll()
				//err := srv.Stop()
				// if err != nil {
				// 	slog.Error("Failed to stop server", slog.String("err", err.Error()))
				// 	os.Exit(1)
				// }
				return
			case syscall.SIGTERM:
				slog.Info("Stopping server by SIGTERM")
				os.Remove(vars.PID_PATH)
				_ = server.StopAll()
				//err := srv.Stop()
				// if err != nil {
				// 	slog.Error("Failed to stop server", slog.String("err", err.Error()))
				// 	os.Exit(1)
				// }
				return
			}
		}
	},
}

func init() {
	optsServeCmd.Debug = serveCmd.Flags().BoolP("debug", "d", false, "Enable debug logs")
	optsServeCmd.ConfigPath = serveCmd.Flags().StringP("config", "c", "config.yaml", "Path to configuration file")
	optsServeCmd.HideGreetings = serveCmd.Flags().BoolP("hide-greetings", "g", false, "Hide the welcome message and version when starting the server")
	rootCmd.AddCommand(serveCmd)
}