package main

import (
	"flag"
	"fmt"
	"log"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"
	"time"

	"Moonshark/modules/http"
	"Moonshark/modules/sql"
	"Moonshark/state"
)

var (
	watchFlag = flag.Bool("watch", false, "Watch script files for changes and restart")
	wFlag     = flag.Bool("w", false, "Watch script files for changes and restart")
)

func main() {
	flag.Parse()

	if flag.NArg() < 1 {
		fmt.Fprintf(os.Stderr, "Usage: %s [--watch|-w] <script.lua>\n", filepath.Base(os.Args[0]))
		os.Exit(1)
	}

	scriptPath := flag.Arg(0)
	watchMode := *watchFlag || *wFlag

	if watchMode {
		runWithWatcher(scriptPath)
	} else {
		runOnce(scriptPath)
	}
}

func runOnce(scriptPath string) {
	luaState, err := state.NewFromScript(scriptPath)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}
	defer luaState.Close()

	if err := luaState.ExecuteFile(scriptPath); err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}

	if http.HasActiveServers() {
		sigChan := make(chan os.Signal, 1)
		signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

		fmt.Println("HTTP servers running. Press Ctrl+C to exit.")

		go func() {
			<-sigChan
			fmt.Println("\nShutting down...")

			// Close main state first (saves KV stores)
			luaState.Close()
			// Then stop servers (closes worker states)
			http.StopAllServers()
			sql.CloseAllConnections()
			os.Exit(0)
		}()

		http.WaitForServers()
	}
}

func runWithWatcher(scriptPath string) {
	watcher, err := NewFileWatcher(500) // 500ms debounce
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to create file watcher: %v\n", err)
		os.Exit(1)
	}
	defer watcher.Close()

	if err := watcher.DiscoverRequiredFiles(scriptPath); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to watch files: %v\n", err)
		os.Exit(1)
	}

	restartCh := watcher.Start()
	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

	fmt.Printf("Starting %s in watch mode...\n", scriptPath)

	var hadError bool
	firstRun := true

	for {
		// If we had an error on the last run and this isn't the first run,
		// wait for file changes before retrying
		if hadError && !firstRun {
			fmt.Println("Waiting for file changes before retrying...")
			select {
			case <-restartCh:
				fmt.Println("Files changed, retrying...")
			case <-sigChan:
				fmt.Println("\nExiting...")
				return
			}
		}

		firstRun = false
		hadError = false

		// Clear cache before each run
		state.ClearCache()

		// Create and run state
		luaState, err := state.NewFromScript(scriptPath)
		if err != nil {
			log.Printf("Error creating state: %v", err)
			hadError = true
			continue
		}

		if err := luaState.ExecuteFile(scriptPath); err != nil {
			log.Printf("Execution error: %v", err)
			luaState.Close()
			hadError = true
			continue
		}

		// If not a long-running process, wait for changes and restart
		if !http.HasActiveServers() {
			fmt.Println("Script completed. Waiting for changes...")
			luaState.Close()

			select {
			case <-restartCh:
				fmt.Println("Files changed, restarting...")
				continue
			case <-sigChan:
				fmt.Println("\nExiting...")
				return
			}
		}

		// Long-running process - wait for restart signal or exit signal
		fmt.Println("HTTP servers running. Watching for file changes...")

		select {
		case <-restartCh:
			fmt.Println("Files changed, restarting...")
			http.StopAllServers()
			luaState.Close()
			sql.CloseAllConnections()
			time.Sleep(100 * time.Millisecond) // Brief pause for cleanup
			continue

		case <-sigChan:
			fmt.Println("\nShutting down...")
			http.StopAllServers()
			luaState.Close()
			sql.CloseAllConnections()
			return
		}
	}
}