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

async function getHomeCategories(ctx) {
  const sql = `
    SELECT 
      hc.id,
      hc.sort_order,
      c.id as category_id,
      c.name as category_name,
      c.icon as category_icon
    FROM home_categories hc
    LEFT JOIN categories c ON hc.category_id = c.id
    WHERE hc.is_enabled = 1 AND c.is_show = 1
    ORDER BY hc.sort_order ASC
  `
  
  const categories = await query(sql)
  
  const data = categories.map(item => ({
    id: item.category_id,
    name: item.category_name,
    icon: item.category_icon,
    sortOrder: item.sort_order
  }))
  
  ctx.body = {
    code: 200,
    data
  }
}

async function updateHomeCategories(ctx) {
  const { categories } = ctx.request.body
  
  if (!Array.isArray(categories)) {
    ctx.body = {
      code: 400,
      message: '分类数据格式错误'
    }
    return
  }
  
  await query('UPDATE home_categories SET is_enabled = 0')
  
  for (const item of categories) {
    if (item.categoryId && item.isEnabled) {
      await query(
        'UPDATE home_categories SET is_enabled = 1, sort_order = ? WHERE category_id = ?',
        [item.sortOrder, item.categoryId]
      )
    }
  }
  
  ctx.body = {
    code: 200,
    message: '更新成功'
  }
}

async function getAllCategoriesForConfig(ctx) {
  const categories = await query('SELECT id, name, icon, image FROM categories WHERE is_show = 1 ORDER BY sort_order ASC')
  const homeCategories = await query('SELECT category_id, sort_order, is_enabled FROM home_categories')
  
  const homeMap = {}
  for (const hc of homeCategories) {
    homeMap[hc.category_id] = {
      sortOrder: hc.sort_order,
      isEnabled: hc.is_enabled === 1
    }
  }
  
  const data = categories.map(cat => ({
    id: cat.id,
    name: cat.name,
    icon: cat.icon,
    image: cat.image,
    ...(homeMap[cat.id] || { sortOrder: 999, isEnabled: false })
  }))
  
  ctx.body = {
    code: 200,
    data
  }
}

module.exports = {
  getHomeCategories,
  updateHomeCategories,
  getAllCategoriesForConfig
}