import type { IncompatibleRule } from '~/types'
import { computed, onMounted, readonly, ref } from 'vue'
import incompatibleFoodsData from '~/data/incompatible-foods.json'

/**
 * 食物相克检测 composable
 */
export function useIncompatibleFoods() {
  // 用于存储从 JSON 加载的相克规则
  const incompatibleRules = ref<IncompatibleRule[]>([])
  // 用于存储并显示给用户的警告信息
  const warningMessage = ref<string>('')
  // 加载状态
  const isLoading = ref(true)

  /**
   * 在组件挂载后，加载食物相克数据
   */
  onMounted(() => {
    try {
      // 直接使用导入的数据
      incompatibleRules.value = incompatibleFoodsData as IncompatibleRule[]
    }
    catch (error) {
      console.error('Failed to load incompatible foods data:', error)
    }
    finally {
      isLoading.value = false
    }
  })

  /**
   * 核心检测函数：检查当前选择的食材是否存在相克组合
   * @param ingredients - 当前已选的食材列表
   */
  const checkIncompatibility = (ingredients: string[]) => {
    // 重置警告信息
    warningMessage.value = ''

    // 如果食材少于2个或规则还没加载完成，无需检测
    if (ingredients.length < 2 || isLoading.value) {
      return
    }

    const foundRules: IncompatibleRule[] = []

    const ingredientSet = new Set(ingredients)

    for (const rule of incompatibleRules.value) {
      // 检查规则中的两种食物是否都存在于我们的食材 Set 中
      if (ingredientSet.has(rule.foodA) && ingredientSet.has(rule.foodB)) {
        foundRules.push(rule)
      }
    }

    // 如果找到相克组合，生成警告信息
    if (foundRules.length > 0) {
      if (foundRules.length === 1) {
        const rule = foundRules[0]!
        warningMessage.value
          = `🚨 危险组合！\n`
            + `【${rule.foodA}】+ 【${rule.foodB}】= 有毒？！\n`
            + `${rule.reason}\n`
            + `换个搭配会更安全哦～`
      }
      else {
        const warnings = foundRules.map(rule =>
          `【${rule.foodA}】+ 【${rule.foodB}】（${rule.reason}）\n`,
        ).join('')
        warningMessage.value
          = `🚨 发现 ${foundRules.length} 个危险组合！\n`
            + `${warnings}`
            + `建议调整搭配哦～`
      }
    }
  }

  // 计算属性：是否有警告信息
  const hasWarning = computed(() => Boolean(warningMessage.value))

  return {
    incompatibleRules: readonly(incompatibleRules),
    warningMessage: readonly(warningMessage),
    hasWarning,
    isLoading: readonly(isLoading),
    checkIncompatibility,
  }
}