import express from 'express';
import mysql from 'mysql2/promise';
import cors from 'cors';
import dotenv from 'dotenv';

dotenv.config();

const app = express();
const PORT = process.env.PORT || 3000;

app.use(cors());
app.use(express.json({ limit: '50mb' }));

// DB 연결 풀 생성
const pool = mysql.createPool({
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  password: process.env.DB_PASS,
  database: process.env.DB_NAME,
  port: parseInt(process.env.DB_PORT || '3306'),
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0
});

// --- API Routes ---

// 1. 하드웨어 자산 조회
app.get('/api/hw', async (req, res) => {
  try {
    const [rows] = await pool.query('SELECT * FROM hw_assets');
    // DB 컬럼명을 프론트엔드 인터페이스(한글)에 맞게 매핑
    const mapped = rows.map(r => ({
      id: r.id,
      type: r.type,
      법인: r.corp,
      자산코드: r.asset_code,
      명칭: r.asset_name,
      위치: r.location,
      현사용조직: r.current_org,
      이전사용조직: r.prev_org,
      담당자_정: r.manager_main,
      관리자: r.manager_main,
      담당자_부: r.manager_sub,
      IP주소: r.ip_address,
      IP2: r.ip_address2,
      MACaddress: r.mac_address,
      OS: r.os,
      CPU: r.cpu,
      RAM: r.ram,
      SSD1: r.storage1,
      SSD2: r.storage2,
      모델명: r.model_name,
      구매일: r.purchase_date,
      금액: r.price,
      납품업체: r.vendor,
      품의서명: r.doc_name,
      용도: r.asset_name, // 서버의 경우 명칭을 용도로 사용
      상세: r.remarks,
      원격접속: r.remote_tool,
      서버ID: r.server_id,
      서버PW: r.server_pw,
      모니터링: r.monitoring,
      비고: r.remarks
    }));
    res.json(mapped);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// 2. 하드웨어 자산 일괄 저장 (항상 덮어쓰기)
app.post('/api/hw/batch', async (req, res) => {
  const assets = req.body;
  const connection = await pool.getConnection();
  try {
    await connection.beginTransaction();
    
    await connection.query('DELETE FROM hw_assets');
    
    if (assets.length > 0) {
      const sql = `
        INSERT INTO hw_assets (
          id, type, corp, asset_code, asset_name, location, current_org, prev_org,
          manager_main, manager_sub, ip_address, ip_address2, mac_address, os,
          cpu, ram, storage1, storage2, model_name, purchase_date, price,
          vendor, doc_name, remote_tool, server_id, server_pw, monitoring, remarks
        ) VALUES ?
      `;
      const values = assets.map(a => [
        a.id, a.type, a.법인, a.자산코드, a.명칭 || a.용도, a.위치, a.현사용조직, a.이전사용조직,
        a.담당자_정 || a.관리자, a.담당자_부, a.IP주소, a.IP2, a.MACaddress, a.OS,
        a.CPU, a.RAM, a.SSD1, a.SSD2, a.모델명, a.구매일, a.금액,
        a.납품업체, a.품의서명, a.원격접속, a.서버ID, a.서버PW, a.모니터링, a.비고 || a.상세
      ]);
      await connection.query(sql, [values]);
    }
    
    await connection.commit();
    res.json({ success: true, count: assets.length, mode: 'overwrite' });
  } catch (err) {
    await connection.rollback();
    res.status(500).json({ error: err.message });
  } finally {
    connection.release();
  }
});

// 3. 소프트웨어 자산 조회
app.get('/api/sw', async (req, res) => {
  try {
    const [rows] = await pool.query('SELECT * FROM sw_assets');
    const mapped = rows.map(r => ({
      id: r.id,
      type: r.type,
      분야: r.category,
      법인: r.corp,
      부서: r.dept,
      제품명: r.product_name,
      구매일: r.purchase_date,
      구독일: r.subscription_date,
      유지보수여부: !!r.maintenance_status,
      금액: r.price,
      수량: r.quantity,
      계정명: r.account_id,
      납품업체: r.vendor,
      비고: r.remarks
    }));
    res.json(mapped);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// 4. 소프트웨어 자산 일괄 저장 (항상 덮어쓰기)
app.post('/api/sw/batch', async (req, res) => {
  const assets = req.body;
  const connection = await pool.getConnection();
  try {
    await connection.beginTransaction();
    
    await connection.query('DELETE FROM sw_assets');
    
    if (assets.length > 0) {
      const sql = `
        INSERT INTO sw_assets (
          id, type, category, corp, dept, product_name, purchase_date,
          subscription_date, maintenance_status, price, quantity,
          account_id, vendor, remarks
        ) VALUES ?
      `;
      const values = assets.map(a => [
        a.id, a.type, a.분야, a.법인, a.부서, a.제품명, a.구매일,
        a.구독일, a.유지보수여부 ? 1 : 0, a.금액, a.수량,
        a.계정명, a.납품업체, a.비고
      ]);
      await connection.query(sql, [values]);
    }
    
    await connection.commit();
    res.json({ success: true, count: assets.length, mode: 'overwrite' });
  } catch (err) {
    await connection.rollback();
    res.status(500).json({ error: err.message });
  } finally {
    connection.release();
  }
});

// 5. SW 사용자 매핑 조회
app.get('/api/sw-users', async (req, res) => {
  try {
    const [rows] = await pool.query('SELECT * FROM sw_users');
    const mapped = rows.map(r => ({
      id: r.id,
      swId: r.sw_id,
      법인: r.corp,
      부서: r.dept,
      팀: r.team,
      직위: r.position,
      이름: r.name,
      사용기간: r.usage_period,
      신청서명: r.doc_name
    }));
    res.json(mapped);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// 6. SW 사용자 일괄 저장 (항상 덮어쓰기)
app.post('/api/sw-users/batch', async (req, res) => {
  const users = req.body;
  const connection = await pool.getConnection();
  try {
    await connection.beginTransaction();
    
    await connection.query('DELETE FROM sw_users');
    
    if (users.length > 0) {
      const sql = `
        INSERT INTO sw_users (
          id, sw_id, corp, dept, team, position, name, usage_period, doc_name
        ) VALUES ?
      `;
      const values = users.map(u => [
        u.id, u.swId, u.법인, u.부서, u.팀, u.직위, u.이름, u.사용기간, u.신청서명
      ]);
      await connection.query(sql, [values]);
    }
    
    await connection.commit();
    res.json({ success: true, count: users.length, mode: 'overwrite' });
  } catch (err) {
    await connection.rollback();
    res.status(500).json({ error: err.message });
  } finally {
    connection.release();
  }
});

app.listen(PORT, () => {
  console.log(`📡 ITAM API Server running on http://localhost:${PORT}`);
});