package handlers

import (
	"encoding/json"
	"net/http"

	"go-backend/internal/auth"
)

type UserResponse struct {
	ID       string `json:"id"`
	Username string `json:"username"`
	Email    string `json:"email"`
}

func (h *Handler) UserHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// Get session token from cookie
	cookies := auth.ParseCookies(r.Header.Get("Cookie"))
	sessionToken, exists := cookies["session"]
	if !exists {
		http.Error(w, "Unauthorized, no session token", http.StatusUnauthorized)
		return
	}

	// Validate session
	session, err := h.auth.ValidateSessionToken(r.Context(), sessionToken)
	if err != nil {
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		return
	}
	if session == nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	// Get user info
	user, err := h.users.FindByID(r.Context(), session.UserID)
	if err != nil {
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		return
	}
	if user == nil {
		http.Error(w, "User not found", http.StatusNotFound)
		return
	}

	resp := UserResponse{
		ID:       user.ID,
		Username: user.Username,
		Email:    user.Email,
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(resp)
}