import { captchaPlugins } from '../middleware/captcha';
import { createErrorResponse, createSuccessResponse } from '../utils';

export const onRequestPost = [
  ...captchaPlugins,
  async (context) => {
    try {
      const { request, env } = context;
      let payload;
      
      try {
        const formData = await request.formData();
        payload = JSON.parse(formData.get('payload'));
      } catch (e) {
        console.error("Payload parsing error:", e);
        return createErrorResponse("Invalid payload", 400);
      }

      const { username, password } = payload;

      if (!username || !password) {
        return createErrorResponse("Missing username or password", 400);
      }

      if (username.length < 3) {
        return createErrorResponse("Username must be at least 3 characters", 400);
      }

      if (password.length < 8) {
        return createErrorResponse("Password must be at least 8 characters", 400);
      }

      if (!/^[a-zA-Z0-9]+$/.test(username)) {
        return createErrorResponse("Username must be alphanumeric", 400);
      }

      // Check if the username already exists
      const { results: existingUsers } = await env.DB.prepare("SELECT id FROM users WHERE username = ?").bind(username).all();
      if (existingUsers.length > 0) {
        return createErrorResponse("Username already exists", 400);
      }

      // Store the username and password in D1
      await env.DB.prepare("INSERT INTO users (username, password, avatar) VALUES (?, ?, ?)").bind(username, password, "avatars/default.png").run();

      // Registration successful, return success response
      return createSuccessResponse("Registration successful", 201);
    } catch (error) {
      console.error("Registration error:", error);
      return createErrorResponse("Server Error", 500);
    }
  },
];