package main

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

// RegistrationRequest represents the incoming registration request.
type RegistrationRequest struct {
	Email   string `json:"email"`
	Captcha string `json:"captcha"`
}

func registerHandler(w http.ResponseWriter, r *http.Request) {
	// Allow only POST method
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// Parse the request body into the RegistrationRequest struct
	var req RegistrationRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	// Validate reCAPTCHA token
	valid, err := validateRecaptcha(req.Captcha)
	if err != nil {
		http.Error(w, fmt.Sprintf("CAPTCHA validation failed: %v", err), http.StatusInternalServerError)
		return
	}
	if !valid {
		http.Error(w, "Invalid CAPTCHA", http.StatusUnauthorized)
		return
	}

	// Initialize Overleaf instance
	overleaf := NewOverleaf("http://localhost:3000") // Replace with the actual Overleaf base URL

	// Optional: Log in as admin (if needed for user creation)
	adminEmail := "admin@example.com" // Replace with actual admin email
	adminPassword := "adminpassword"  // Replace with actual admin password
	if err := overleaf.Login(adminEmail, adminPassword); err != nil {
		http.Error(w, fmt.Sprintf("Admin login failed: %v", err), http.StatusInternalServerError)
		return
	}

	// Create the user in Overleaf
	if err := overleaf.RegisterUser(req.Email); err != nil {
		http.Error(w, fmt.Sprintf("Failed to create user: %v", err), http.StatusInternalServerError)
		return
	}

	// Respond with success
	w.WriteHeader(http.StatusOK)
	w.Write([]byte("User registered successfully. Please check your email to set your password."))
}