package handlers

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

	"go-backend/internal/auth"
)

type LoginRequest struct {
	Username string `json:"username"`
	Password string `json:"password"`
}

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

	var req LoginRequest

	decoder := json.NewDecoder(r.Body)
	err := decoder.Decode(&req)
	if err != nil {
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	if req.Username == "" || req.Password == "" {
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	user, err := h.users.FindByUsername(r.Context(), req.Username)
	if err != nil {
		log.Printf("Error finding user: %v", err)
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		return
	}

	if user == nil {
		http.Error(w, "Invalid username", http.StatusBadRequest)
		return
	}

	if !auth.VerifyPassword(user.PasswordHash, req.Password) {
		http.Error(w, "Invalid username or password", http.StatusBadRequest)
		return
	}

	session, err := h.auth.CreateSession(r.Context(), user.ID)
	if err != nil {
		log.Printf("Error creating session: %v", err)
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		return
	}

	cookie := &http.Cookie{
		Name:     "session",
		Value:    session.Token,
		HttpOnly: true,
		SameSite: http.SameSiteLaxMode,
		MaxAge:   86400, // 24 hours
		Path:     "/",
	}
	http.SetCookie(w, cookie)

	w.WriteHeader(http.StatusOK)
	w.Write([]byte("Success"))
}