# app/services/ProductService.coffee
{ Product } = require 'app/types/data'

class ProductService
  constructor: ->
    @pouchService = require 'app/utils/pouch'
    @initialized = false

  init: ->
    return Promise.resolve() if @initialized
    
    try
      await @pouchService.init()
      @initialized = true
      log '✅ ProductService инициализирован'
      return Promise.resolve()
    catch error
      log '❌ Ошибка инициализации ProductService:', error
      return Promise.reject(error)

  getAllProducts: (options = {}) ->
    await @ensureInit()
    
    try
      opts = 
        include_docs: true
        startkey: ['product']
        endkey: ['product', {}]
      
      result = await @pouchService.queryView('products', 'by_category', opts)
      
      products = result.rows.map (row) ->
        new Product(row.doc)
      
      log '📦 Загружены товары:', products.length
      return products
    catch error
      log '❌ Ошибка загрузки товаров:', error
      throw error

  getProductsByCategory: (category, options = {}) ->
    await @ensureInit()
    
    try
      opts = 
        include_docs: true
        key: [category]
      
      result = await @pouchService.queryView('products', 'by_category', opts)
      
      products = result.rows.map (row) ->
        new Product(row.doc)
      
      log "📦 Загружены товары категории #{category}:", products.length
      return products
    catch error
      log "❌ Ошибка загрузки товаров категории #{category}:", error
      throw error

  getProductBySku: (sku) ->
    await @ensureInit()
    
    try
      result = await @pouchService.queryView('products', 'by_sku', {
        key: sku
        include_docs: true
      })
      
      if result.rows.length > 0
        product = new Product(result.rows[0].doc)
        log "📦 Загружен товар по SKU: #{sku}"
        return product
      else
        log "⚠️ Товар не найден по SKU: #{sku}"
        return null
    catch error
      log "❌ Ошибка поиска товара по SKU #{sku}:", error
      throw error

  searchProducts: (query, options = {}) ->
    await @ensureInit()
    
    try
      # Простой поиск по индексу
      searchTerms = query.toLowerCase().split(/\s+/).filter (term) -> term.length > 2
      
      if searchTerms.length == 0
        return []
      
      # Здесь будет реализация полнотекстового поиска
      # Временная реализация - поиск по всем товарам и фильтрация
      allProducts = await @getAllProducts()
      
      filteredProducts = allProducts.filter (product) ->
        searchable = [
          product.name
          product.brand
          product.category
          product.description
        ].join(' ').toLowerCase()
        
        searchTerms.every (term) -> searchable.includes(term)
      
      log "🔍 Результаты поиска '#{query}':", filteredProducts.length
      return filteredProducts
    catch error
      log "❌ Ошибка поиска товаров '#{query}':", error
      throw error

  saveProduct: (productData) ->
    await @ensureInit()
    
    try
      product = new Product(productData)
      
      # Генерация ID если не установлен
      if not product._id
        product._id = "product:#{product.sku}"
      
      result = await @pouchService.saveDocument(product)
      log "💾 Товар сохранен: #{product.name}"
      return result
    catch error
      log "❌ Ошибка сохранения товара:", error
      throw error

  ensureInit: ->
    unless @initialized
      throw new Error('ProductService не инициализирован. Вызовите init() сначала.')

module.exports = new ProductService()