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

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,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params;
    const houses = await readHouses();
    const house = houses.find(h => h.id === id);
    
    if (!house) {
      return NextResponse.json({ error: '房屋不存在' }, { status: 404 });
    }
    
    return NextResponse.json({ house });
  } catch (error) {
    console.error('Get house error:', error);
    return NextResponse.json({ error: '获取房屋信息失败' }, { status: 500 });
  }
}

export async function PUT(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  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 { id } = await params;
    const houses = await readHouses();
    const houseIndex = houses.findIndex(h => h.id === id);
    
    if (houseIndex === -1) {
      return NextResponse.json({ error: '房屋不存在' }, { status: 404 });
    }
    
    if (houses[houseIndex].owner !== user.username) {
      return NextResponse.json({ error: '无权修改此房屋' }, { status: 403 });
    }
    
    const body = await request.json();
    const { title, description, price, district, address, phone, images } = body;
    
    houses[houseIndex] = {
      ...houses[houseIndex],
      title: title || houses[houseIndex].title,
      description: description ?? houses[houseIndex].description,
      price: price !== undefined ? Number(price) : houses[houseIndex].price,
      district: district || houses[houseIndex].district,
      address: address || houses[houseIndex].address,
      phone: phone || houses[houseIndex].phone,
      images: images || houses[houseIndex].images
    };
    
    await writeHouses(houses);
    
    return NextResponse.json({ success: true, house: houses[houseIndex] });
  } catch (error) {
    console.error('Update house error:', error);
    return NextResponse.json({ error: '更新房屋失败' }, { status: 500 });
  }
}

export async function DELETE(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  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 { id } = await params;
    const houses = await readHouses();
    const house = houses.find(h => h.id === id);
    
    if (!house) {
      return NextResponse.json({ error: '房屋不存在' }, { status: 404 });
    }
    
    if (house.owner !== user.username) {
      return NextResponse.json({ error: '无权删除此房屋' }, { status: 403 });
    }
    
    const newHouses = houses.filter(h => h.id !== id);
    await writeHouses(newHouses);
    
    return NextResponse.json({ success: true });
  } catch (error) {
    console.error('Delete house error:', error);
    return NextResponse.json({ error: '删除房屋失败' }, { status: 500 });
  }
}