package handler

import (
	"fmt"
	"log"
	"net/http"
	"time"

	"github.com/alberdjuniawan/anput-api/repository"
	"github.com/alberdjuniawan/anput-api/util"
	chiMiddleware "github.com/go-chi/chi/v5/middleware"
	"golang.org/x/crypto/bcrypt"
)

type AuthHandler struct {
	Repo repository.Repository
}

func NewAuthHandler(repo repository.Repository) *AuthHandler {
	return &AuthHandler{Repo: repo}
}

func (h *AuthHandler) GenerateSandboxKey(w http.ResponseWriter, r *http.Request) {
	reqID := chiMiddleware.GetReqID(r.Context())
	ctx := r.Context()

	randSuffix, _ := util.GenerateRandomString(4)
	guestEmail := fmt.Sprintf("guest_%d_%s@anput.temp", time.Now().Unix(), randSuffix)

	userID, err := h.Repo.CreateUser(ctx, guestEmail)
	if err != nil {
		log.Printf("[%s] Error creating guest user: %v", reqID, err)
		util.WriteError(w, http.StatusInternalServerError, "Failed to initialize session", reqID)
		return
	}

	prefix := "anput_live"

	publicID, err := util.GenerateRandomString(8)
	if err != nil {
		log.Printf("[%s] Random string gen error (publicID): %v", reqID, err)
		util.WriteError(w, http.StatusInternalServerError, "Key generation failed", reqID)
		return
	}

	secret, err := util.GenerateRandomString(16)
	if err != nil {
		log.Printf("[%s] Random string gen error (secret): %v", reqID, err)
		util.WriteError(w, http.StatusInternalServerError, "Key generation failed", reqID)
		return
	}

	hashedSecret, err := bcrypt.GenerateFromPassword([]byte(secret), bcrypt.DefaultCost)
	if err != nil {
		log.Printf("[%s] Hashing error: %v", reqID, err)
		util.WriteError(w, http.StatusInternalServerError, "Security processing failed", reqID)
		return
	}

	expiresAt := time.Now().Add(30 * time.Minute)

	err = h.Repo.CreateAPIKey(ctx, userID, "Guest Sandbox Session", prefix, publicID, string(hashedSecret), expiresAt)
	if err != nil {
		log.Printf("[%s] Repo CreateAPIKey error: %v", reqID, err)
		util.WriteError(w, http.StatusInternalServerError, "Failed to save credentials", reqID)
		return
	}

	fullApiKey := fmt.Sprintf("%s_%s_%s", prefix, publicID, secret)

	responseData := map[string]interface{}{
		"api_key":    fullApiKey,
		"expires_at": expiresAt,
		"message":    "Ephemeral sandbox session created. Valid for 30 minutes.",
	}

	util.WriteSuccess(w, http.StatusCreated, responseData, reqID)
}