package main

import (
	"context"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"
	"time"

	"github.com/mathieu/personotes/internal/api"
	"github.com/mathieu/personotes/internal/i18n"
	"github.com/mathieu/personotes/internal/indexer"
	"github.com/mathieu/personotes/internal/watcher"
)

func main() {
	// Vérifier si une sous-commande est demandée
	if len(os.Args) > 1 && os.Args[1] == "list-public" {
		cmdListPublic()
		return
	}

	addr := flag.String("addr", ":8080", "Adresse d ecoute HTTP")
	notesDir := flag.String("notes-dir", "./notes", "Repertoire contenant les notes Markdown")
	flag.Parse()

	logger := log.New(os.Stdout, "[server] ", log.LstdFlags)

	runServer(*addr, *notesDir, logger)
}

// cmdListPublic liste les notes publiques
func cmdListPublic() {
	notesDir := "./notes"
	if len(os.Args) > 2 && os.Args[2] != "" {
		notesDir = os.Args[2]
	}

	publicFile := filepath.Join(notesDir, ".public.json")

	// Lire le fichier .public.json
	data, err := os.ReadFile(publicFile)
	if err != nil {
		if os.IsNotExist(err) {
			fmt.Println("Aucune note publique trouvée.")
			fmt.Printf("Le fichier %s n'existe pas.\n", publicFile)
			os.Exit(0)
		}
		fmt.Fprintf(os.Stderr, "Erreur de lecture: %v\n", err)
		os.Exit(1)
	}

	var publicNotes struct {
		Notes []struct {
			Path        string    `json:"path"`
			Title       string    `json:"title"`
			PublishedAt time.Time `json:"published_at"`
		} `json:"notes"`
	}

	if err := json.Unmarshal(data, &publicNotes); err != nil {
		fmt.Fprintf(os.Stderr, "Erreur de parsing JSON: %v\n", err)
		os.Exit(1)
	}

	if len(publicNotes.Notes) == 0 {
		fmt.Println("Aucune note publique.")
		os.Exit(0)
	}

	fmt.Printf("\n📚 Notes publiques (%d):\n\n", len(publicNotes.Notes))
	for _, note := range publicNotes.Notes {
		filename := filepath.Base(note.Path)
		htmlFile := filename[:len(filename)-3] + ".html"

		fmt.Printf("• %s\n", note.Title)
		fmt.Printf("  Source: %s\n", note.Path)
		fmt.Printf("  Public: public/%s\n", htmlFile)
		fmt.Printf("  Date:   %s\n\n", note.PublishedAt.Format("2006-01-02 15:04:05"))
	}
}

func runServer(addr, notesDir string, logger *log.Logger) {
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()

	if err := ensureDir(notesDir); err != nil {
		logger.Fatalf("repertoire notes invalide: %v", err)
	}

	idx := indexer.New()
	if err := idx.Load(notesDir); err != nil {
		logger.Fatalf("echec de l indexation initiale: %v", err)
	}

	// Load translations
	translator := i18n.New("en") // Default language: English
	if err := translator.LoadFromDir("./locales"); err != nil {
		logger.Fatalf("echec du chargement des traductions: %v", err)
	}
	logger.Printf("traductions chargees: %v", translator.GetAvailableLanguages())

	w, err := watcher.Start(ctx, notesDir, idx, logger)
	if err != nil {
		logger.Fatalf("echec du watcher: %v", err)
	}
	defer w.Close()

	// Pre-parse templates
	templates, err := template.ParseGlob("templates/*.html")
	if err != nil {
		logger.Fatalf("echec de l analyse des templates: %v", err)
	}

	mux := http.NewServeMux()

	// Servir les fichiers statiques
	mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("./static"))))
	mux.Handle("/frontend/", http.StripPrefix("/frontend/", http.FileServer(http.Dir("./frontend"))))

	// Servir les fichiers HTML publics (notes exportées)
	publicDir := filepath.Join(notesDir, "..", "public")
	if _, err := os.Stat(publicDir); err == nil {
		mux.Handle("/public/", http.StripPrefix("/public/", http.FileServer(http.Dir(publicDir))))
	}

	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/" {
			http.NotFound(w, r)
			return
		}
		data := map[string]interface{}{
			"Now": time.Now(),
		}
		if err := templates.ExecuteTemplate(w, "index.html", data); err != nil {
			logger.Printf("erreur d execution du template index: %v", err)
			http.Error(w, "erreur interne", http.StatusInternalServerError)
		}
	})

	apiHandler := api.NewHandler(notesDir, idx, templates, logger, translator)
	mux.Handle("/api/i18n/", apiHandler)         // I18n translations
	mux.Handle("/api/v1/notes", apiHandler)      // REST API v1
	mux.Handle("/api/v1/notes/", apiHandler)     // REST API v1
	mux.Handle("/api/search", apiHandler)
	mux.Handle("/api/folders/create", apiHandler)
	mux.Handle("/api/files/move", apiHandler)
	mux.Handle("/api/files/delete-multiple", apiHandler)
	mux.Handle("/api/home", apiHandler)
	mux.Handle("/api/about", apiHandler)         // About page
	mux.Handle("/api/daily", apiHandler)         // Daily notes
	mux.Handle("/api/daily/", apiHandler)        // Daily notes
	mux.Handle("/api/favorites", apiHandler)     // Favorites
	mux.Handle("/api/folder/", apiHandler)       // Folder view
	mux.Handle("/api/notes/", apiHandler)
	mux.Handle("/api/tree", apiHandler)
	mux.Handle("/api/public/list", apiHandler)   // List public notes
	mux.Handle("/api/public/toggle", apiHandler) // Toggle public status (génère HTML statique)

	srv := &http.Server{
		Addr:         addr,
		Handler:      mux,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	logger.Printf("demarrage du serveur sur %s", addr)

	go func() {
		<-ctx.Done()
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		if err := srv.Shutdown(shutdownCtx); err != nil {
			logger.Printf("erreur durant l arret du serveur: %v", err)
		}
	}()

	if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
		logger.Fatalf("arret inattendu du serveur: %v", err)
	}
}

func ensureDir(path string) error {
	info, err := os.Stat(path)
	if err != nil {
		if os.IsNotExist(err) {
			return fmt.Errorf("le chemin %s n existe pas", path)
		}
		return err
	}
	if !info.IsDir() {
		return fmt.Errorf("%s n est pas un repertoire", path)
	}
	return nil
}