const { query } = require('../config/database')

async function getAddresses(ctx) {
  const userId = ctx.query.user_id
  if (!userId) {
    ctx.body = { code: 400, message: '缺少 user_id 参数' }
    return
  }

  const rows = await query(
    'SELECT * FROM addresses WHERE user_id = ? ORDER BY is_default DESC, created_at DESC',
    [userId]
  )

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

async function getAddressById(ctx) {
  const id = ctx.params.id
  const rows = await query('SELECT * FROM addresses WHERE id = ?', [id])

  if (rows.length > 0) {
    ctx.body = { code: 200, data: rows[0] }
  } else {
    ctx.body = { code: 404, message: '地址不存在' }
  }
}

async function createAddress(ctx) {
  const { user_id, name, phone, region, detail, is_default = 0 } = ctx.request.body

  if (!user_id || !name || !phone || !detail) {
    ctx.body = { code: 400, message: '缺少必填参数' }
    return
  }

  if (is_default) {
    await query('UPDATE addresses SET is_default = 0 WHERE user_id = ?', [user_id])
  }

  const result = await query(
    'INSERT INTO addresses (user_id, name, phone, region, detail, is_default) VALUES (?, ?, ?, ?, ?, ?)',
    [user_id, name, phone, region || '', detail, is_default ? 1 : 0]
  )

  ctx.body = { code: 200, data: { id: result.insertId } }
}

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

  const current = await query('SELECT * FROM addresses WHERE id = ?', [id])
  if (!current.length) {
    ctx.body = { code: 404, message: '地址不存在' }
    return
  }

  if (updates.is_default) {
    await query('UPDATE addresses SET is_default = 0 WHERE user_id = ?', [current[0].user_id])
  }

  const fields = []
  const params = []
  for (const key of ['name', 'phone', 'region', 'detail', 'is_default']) {
    if (updates[key] !== undefined) {
      fields.push(`${key} = ?`)
      params.push(key === 'is_default' ? (updates[key] ? 1 : 0) : updates[key])
    }
  }

  if (fields.length > 0) {
    params.push(id)
    await query(`UPDATE addresses SET ${fields.join(', ')} WHERE id = ?`, params)
  }

  const updated = await query('SELECT * FROM addresses WHERE id = ?', [id])
  ctx.body = { code: 200, data: updated[0] }
}

async function deleteAddress(ctx) {
  const id = ctx.params.id
  await query('DELETE FROM addresses WHERE id = ?', [id])
  ctx.body = { code: 200, message: '删除成功' }
}

async function setDefault(ctx) {
  const id = ctx.params.id
  const rows = await query('SELECT * FROM addresses WHERE id = ?', [id])

  if (!rows.length) {
    ctx.body = { code: 404, message: '地址不存在' }
    return
  }

  await query('UPDATE addresses SET is_default = 0 WHERE user_id = ?', [rows[0].user_id])
  await query('UPDATE addresses SET is_default = 1 WHERE id = ?', [id])

  ctx.body = { code: 200, message: '设置成功' }
}

module.exports = {
  getAddresses,
  getAddressById,
  createAddress,
  updateAddress,
  deleteAddress,
  setDefault
}