import { NextRequest, NextResponse } from 'next/server';
import fs from 'fs/promises';
import path from 'path';
import crypto from 'crypto';

const DATA_DIR = path.join(process.cwd(), 'data');
const HOUSES_FILE = path.join(DATA_DIR, 'houses.json');
const USERS_FILE = path.join(DATA_DIR, 'users.json');

interface House {
  id: string;
  owner: string;
  title: string;
  description: string;
  price: number;
  district: string;
  address: string;
  phone: string;
  images: string[];
  createdAt: string;
}

interface User {
  id: string;
  username: string;
  token: string;
}

async function readFile<T>(filePath: string, defaultValue: T): Promise<T> {
  try {
    const data = await fs.readFile(filePath, 'utf-8');
    return JSON.parse(data);
  } catch {
    return defaultValue;
  }
}

async function getUserFromToken(token: string): Promise<User | null> {
  const users = await readFile<User[]>(USERS_FILE, []);
  return users.find(u => u.token === token) || null;
}

async function readHouses(): Promise<House[]> {
  return readFile<House[]>(HOUSES_FILE, []);
}

async function writeHouses(houses: House[]): Promise<void> {
  await fs.writeFile(HOUSES_FILE, JSON.stringify(houses, null, 2));
}

export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const district = searchParams.get('district');
    const keyword = searchParams.get('keyword');
    
    let houses = await readHouses();
    
    if (district && district !== '全部') {
      houses = houses.filter(h => h.district === district);
    }
    
    if (keyword) {
      const kw = keyword.toLowerCase();
      houses = houses.filter(h => 
        h.title.toLowerCase().includes(kw) ||
        h.address.toLowerCase().includes(kw) ||
        h.description.toLowerCase().includes(kw)
      );
    }
    
    houses.sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime());
    
    return NextResponse.json({ houses });
  } catch (error) {
    console.error('Get houses error:', error);
    return NextResponse.json({ error: '获取房屋列表失败' }, { status: 500 });
  }
}

export async function POST(request: NextRequest) {
  try {
    const token = request.cookies.get('auth_token')?.value;
    
    if (!token) {
      return NextResponse.json({ error: '请先登录' }, { status: 401 });
    }
    
    const user = await getUserFromToken(token);
    if (!user) {
      return NextResponse.json({ error: '用户不存在' }, { status: 401 });
    }
    
    const body = await request.json();
    const { title, description, price, district, address, phone, images } = body;
    
    if (!title || !price || !district || !address || !phone) {
      return NextResponse.json({ error: '请填写完整信息' }, { status: 400 });
    }
    
    const house: House = {
      id: crypto.randomUUID(),
      owner: user.username,
      title,
      description: description || '',
      price: Number(price),
      district,
      address,
      phone,
      images: images || [],
      createdAt: new Date().toISOString()
    };
    
    const houses = await readHouses();
    houses.push(house);
    await writeHouses(houses);
    
    return NextResponse.json({ success: true, house });
  } catch (error) {
    console.error('Create house error:', error);
    return NextResponse.json({ error: '创建房屋失败' }, { status: 500 });
  }
}