package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"path/filepath"
)

var (
	cfg        *Config
	templates  *TemplateRenderer
	sessionMgr *SessionManager
	ptyMgr     *PTYSessionManager
)

func main() {
	var err error

	cfg, err = LoadConfig("config.json")
	if err != nil {
		log.Fatalf("Config: %v", err)
	}

	templates, err = NewTemplateRenderer("templates")
	if err != nil {
		log.Fatalf("Templates: %v", err)
	}

	sessionMgr = NewSessionManager(cfg.SessionSecret)
	ptyMgr = NewPTYSessionManager()
	defer ptyMgr.Stop()

	wsHandler := NewTerminalHandler(ptyMgr)

	mux := http.NewServeMux()

	// Static files
	mux.Handle("GET /static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))

	// Public routes
	mux.HandleFunc("GET /login", handleLoginPage)
	mux.HandleFunc("POST /login", handleLogin)
	mux.HandleFunc("GET /logout", handleLogout)

	// Protected routes
	mux.Handle("GET /projects", AuthMiddleware(sessionMgr, http.HandlerFunc(handleProjects)))
	mux.Handle("POST /projects/create", AuthMiddleware(sessionMgr, http.HandlerFunc(handleCreateProject)))
	mux.Handle("GET /chat/{project}", AuthMiddleware(sessionMgr, http.HandlerFunc(handleChat)))
	mux.Handle("GET /ws", AuthMiddleware(sessionMgr, wsHandler))
	mux.Handle("GET /api/file", AuthMiddleware(sessionMgr, http.HandlerFunc(handleFileAPI)))
	mux.Handle("GET /change-password", AuthMiddleware(sessionMgr, http.HandlerFunc(handleChangePasswordPage)))
	mux.Handle("POST /change-password", AuthMiddleware(sessionMgr, http.HandlerFunc(handleChangePassword)))

	// Root redirect (exact match only)
	mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) {
		http.Redirect(w, r, "/projects", http.StatusSeeOther)
	})

	addr := fmt.Sprintf(":%d", cfg.Port)
	log.Printf("Claude Web Chat pokrenut na http://0.0.0.0%s (mod: %s)", addr, cfg.Mode)
	log.Fatal(http.ListenAndServe(addr, mux))
}

func handleLoginPage(w http.ResponseWriter, r *http.Request) {
	// If already logged in, redirect
	if cookie, err := r.Cookie(sessionCookieName); err == nil {
		if sessionMgr.Get(cookie.Value) != nil {
			http.Redirect(w, r, "/projects", http.StatusSeeOther)
			return
		}
	}
	templates.Render(w, "login.html", map[string]string{"Error": ""})
}

func handleLogin(w http.ResponseWriter, r *http.Request) {
	username := r.FormValue("username")
	password := r.FormValue("password")

	if username != cfg.Username || !cfg.CheckPassword(password) {
		w.WriteHeader(http.StatusUnauthorized)
		templates.Render(w, "login.html", map[string]string{"Error": "Pogrešno korisničko ime ili lozinka"})
		return
	}

	sess := sessionMgr.Create(username)
	SetSessionCookie(w, sess)
	http.Redirect(w, r, "/projects", http.StatusSeeOther)
}

func handleLogout(w http.ResponseWriter, r *http.Request) {
	if cookie, err := r.Cookie(sessionCookieName); err == nil {
		sessionMgr.Delete(cookie.Value)
	}
	ClearSessionCookie(w)
	http.Redirect(w, r, "/login", http.StatusSeeOther)
}

func handleProjects(w http.ResponseWriter, r *http.Request) {
	projects, err := ListProjects(cfg.ProjectsPath)
	if err != nil {
		log.Printf("ListProjects error: %v", err)
		http.Error(w, "Greška pri čitanju projekata", http.StatusInternalServerError)
		return
	}

	data := map[string]any{
		"Projects":     projects,
		"ProjectsPath": cfg.ProjectsPath,
	}
	templates.Render(w, "projects.html", data)
}

func handleCreateProject(w http.ResponseWriter, r *http.Request) {
	name := r.FormValue("name")

	if err := CreateProject(cfg.ProjectsPath, name); err != nil {
		projects, _ := ListProjects(cfg.ProjectsPath)
		data := map[string]any{
			"Projects":     projects,
			"ProjectsPath": cfg.ProjectsPath,
			"Error":        err.Error(),
		}
		w.WriteHeader(http.StatusBadRequest)
		templates.Render(w, "projects.html", data)
		return
	}

	http.Redirect(w, r, "/projects", http.StatusSeeOther)
}

func handleChat(w http.ResponseWriter, r *http.Request) {
	project := r.PathValue("project")
	if project == "" {
		http.Redirect(w, r, "/projects", http.StatusSeeOther)
		return
	}

	projectDir := filepath.Join(cfg.ProjectsPath, project)

	files, err := ListMarkdownFiles(projectDir)
	if err != nil {
		log.Printf("ListMarkdownFiles error: %v", err)
		files = nil
	}

	data := map[string]any{
		"Project":    project,
		"ProjectDir": projectDir,
		"Files":      files,
	}
	templates.Render(w, "chat.html", data)
}

func handleChangePasswordPage(w http.ResponseWriter, r *http.Request) {
	templates.Render(w, "change-password.html", map[string]string{"Error": "", "Success": ""})
}

func handleChangePassword(w http.ResponseWriter, r *http.Request) {
	currentPassword := r.FormValue("current_password")
	newPassword := r.FormValue("new_password")
	confirmPassword := r.FormValue("confirm_password")

	data := map[string]string{"Error": "", "Success": ""}

	if !cfg.CheckPassword(currentPassword) {
		data["Error"] = "Pogrešna trenutna lozinka"
		w.WriteHeader(http.StatusBadRequest)
		templates.Render(w, "change-password.html", data)
		return
	}

	if len(newPassword) < 6 {
		data["Error"] = "Nova lozinka mora imati najmanje 6 karaktera"
		w.WriteHeader(http.StatusBadRequest)
		templates.Render(w, "change-password.html", data)
		return
	}

	if newPassword != confirmPassword {
		data["Error"] = "Nova lozinka i potvrda se ne poklapaju"
		w.WriteHeader(http.StatusBadRequest)
		templates.Render(w, "change-password.html", data)
		return
	}

	if err := cfg.SetPassword(newPassword); err != nil {
		log.Printf("SetPassword error: %v", err)
		data["Error"] = "Greška pri čuvanju lozinke"
		w.WriteHeader(http.StatusInternalServerError)
		templates.Render(w, "change-password.html", data)
		return
	}

	data["Success"] = "Lozinka je uspešno promenjena"
	templates.Render(w, "change-password.html", data)
}

func handleFileAPI(w http.ResponseWriter, r *http.Request) {
	project := r.URL.Query().Get("project")
	relPath := r.URL.Query().Get("path")

	if project == "" || relPath == "" {
		http.Error(w, "missing params", http.StatusBadRequest)
		return
	}

	projectDir := filepath.Join(cfg.ProjectsPath, project)
	htmlContent, err := RenderMarkdownFile(projectDir, relPath)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{
		"name": relPath,
		"html": htmlContent,
	})
}