const { query, transaction } = require('../config/database')
const { paginate } = require('../utils/pagination')
const orderService = require('../services/orderService')

async function getOrders(ctx) {
  const { page, pageSize, status } = ctx.query
  let sql = 'SELECT * FROM orders WHERE 1=1'
  const params = []
  if (status) {
    sql += ' AND status = ?'
    params.push(status)
  }
  sql += ' ORDER BY created_at DESC'
  const result = await paginate(query, sql, params, page, pageSize)

  const rows = result.data || []
  await orderService.attachOrderItems(rows)

  ctx.body = {
    code: 200,
    ...result
  }
}

async function getOrderById(ctx) {
  const orderId = ctx.params.id
  const orders = await query('SELECT * FROM orders WHERE id = ?', [orderId])

  if (orders.length > 0) {
    const order = orders[0]
    order.items = await orderService.getOrderItems(orderId)
    ctx.body = {
      code: 200,
      data: order
    }
  } else {
    ctx.body = {
      code: 404,
      message: '订单不存在'
    }
  }
}

async function createOrder(ctx) {
  const { id, userId, totalPrice, cart, remark, customerName, customerPhone, orderType, status } = ctx.request.body

  const orderId = id || `order_${Date.now()}_${Math.floor(Math.random() * 1000)}`

  const userInfo = JSON.stringify({
    remark: remark || '',
    customerName: customerName || '',
    customerPhone: customerPhone || '',
    orderType: orderType || 'customer'
  })

  await transaction(async (conn) => {
    await conn.execute(
      'INSERT INTO orders (id, user_id, status, total_price, cart, user_info) VALUES (?, ?, ?, ?, ?, ?)',
      [orderId, userId || null, status || 'pending', totalPrice, typeof cart === 'string' ? cart : JSON.stringify(cart), userInfo]
    )
    await orderService.insertOrderItems(conn, orderId, cart)
  })

  const orders = await query('SELECT * FROM orders WHERE id = ?', [orderId])
  const created = orders[0]
  created.items = await orderService.getOrderItems(orderId)

  if (created.status === 'completed') {
    setImmediate(() => orderService.processOrderComplete(created))
  }

  ctx.body = {
    code: 200,
    data: created
  }
}

async function updateOrder(ctx) {
  const orderId = ctx.params.id
  const updates = ctx.request.body

  const orders = await query('SELECT * FROM orders WHERE id = ?', [orderId])

  if (orders.length > 0) {
    const prevStatus = orders[0].status
    const updateFields = []
    const updateParams = []

    if (updates.status !== undefined) {
      updateFields.push('status = ?')
      updateParams.push(updates.status)
    }
    const totalPrice = updates.total_price !== undefined ? updates.total_price : updates.totalPrice
    if (totalPrice !== undefined) {
      updateFields.push('total_price = ?')
      updateParams.push(totalPrice)
    }
    if (updates.cart !== undefined) {
      const cartStr = typeof updates.cart === 'string' ? updates.cart : JSON.stringify(updates.cart)
      updateFields.push('cart = ?')
      updateParams.push(cartStr)
    }

    if (updateFields.length > 0) {
      updateParams.push(orderId)
      await query(`UPDATE orders SET ${updateFields.join(', ')} WHERE id = ?`, updateParams)
    }

    if (updates.cart !== undefined) {
      await transaction(async (conn) => {
        await conn.execute('DELETE FROM order_items WHERE order_id = ?', [orderId])
        await orderService.insertOrderItems(conn, orderId, updates.cart)
      })
    }

    const updatedOrders = await query('SELECT * FROM orders WHERE id = ?', [orderId])
    const completed = updatedOrders[0]
    completed.items = await orderService.getOrderItems(orderId)

    if (completed.status === 'completed' && prevStatus !== 'completed') {
      setImmediate(() => orderService.processOrderComplete(completed))
    }

    ctx.body = {
      code: 200,
      data: completed
    }
  } else {
    ctx.body = {
      code: 404,
      message: '订单不存在'
    }
  }
}

module.exports = {
  getOrders,
  getOrderById,
  createOrder,
  updateOrder
}