import { View, ScrollView } from '@tarojs/components'
import { useEffect, useState } from 'react'
import Taro, { navigateTo } from '@tarojs/taro'
import { useAppDispatch, useAppSelector } from '../../hooks/redux'
import { selectTemplates } from '../../selectors/template'
import { initTemplates } from '../../actions/template'
import { Template } from '../../store/types'
import TemplateCard from '../../components/TemplateCard'
import { useSdk, useServerSdk } from '../../hooks/index'
import { useImageDetectionTaskManager, ImageAuditResult, AuditConclusion } from '../../hooks/useImageDetectionTaskManager'

import './index.css'

// 定义详细的加载状态类型
type LoadingState = false | 'uploading' | 'auditing' | 'processing'

export default function Home() {
  const dispatch = useAppDispatch()
  const templates = useAppSelector(selectTemplates)
  const sdk = useSdk()
  const serverSdk = useServerSdk()
  const { submitAuditTask } = useImageDetectionTaskManager()
  const [loadingState, setLoadingState] = useState<LoadingState>(false)
  const [refreshing, setRefreshing] = useState(false)

  const loadTemplates = async () => {
    try {
      const templates = await serverSdk.getAllTemplates()
      console.log(templates)
      dispatch(initTemplates(templates))
    } catch (error) {
      console.error('加载模板失败:', error)
      Taro.showToast({
        title: '加载模板失败',
        icon: 'error',
        duration: 2000
      })
    }
  }

  // 下拉刷新处理
  const handleRefresh = async () => {
    setRefreshing(true)
    try {
      await loadTemplates()
      Taro.showToast({
        title: '刷新成功',
        icon: 'success',
        duration: 1500
      })
    } catch (error) {
      console.error('刷新失败:', error)
    } finally {
      setRefreshing(false)
    }
  }

  useEffect(() => {
    // 需要先检查是否有模板配置文件
    loadTemplates()
  }, [dispatch])

  // 获取加载状态的显示文本
  const getLoadingText = (state: LoadingState): string => {
    switch (state) {
      default:
        return '请稍后...'
    }
  }

  // 处理审核失败
  const handleAuditFailure = (auditResult: ImageAuditResult) => {
    const messages: Record<AuditConclusion, string> = {
      [AuditConclusion.REJECT]: '图片内容不符合规范，请重新选择符合规范的图片',
      [AuditConclusion.REVIEW]: '图片需要人工审核，请稍后重试或更换其他图片',
      [AuditConclusion.UNCERTAIN]: '图片审核结果不确定，请重新选择图片',
      [AuditConclusion.PASS]: '图片审核通过' // 虽然不会用到，但为了类型完整性
    }

    const message = auditResult.conclusion ? messages[auditResult.conclusion] : '图片审核失败，请重新选择图片'

    Taro.showModal({
      title: '图片审核未通过',
      content: message,
      confirmText: '我知道了',
      showCancel: false,
      success: () => {
        console.log('用户确认审核失败信息')
      }
    })
  }

  const handleTemplateClick = async (template: Template) => {
    if (loadingState) return // 防止重复点击

    try {
      // 第一步：选择并上传图片
      Taro.showLoading({
        title: getLoadingText('uploading'),
        mask: true
      })

      const imageUrl = await sdk.chooseAndUploadImage({
        onImageSelected: () => {
          console.log('用户选择了图片')
        },
        onProgress: () => {
          Taro.showLoading({
            title: `请稍后...`,
            mask: true
          })
        }
      })

      // 第二步：图片内容审核
      setLoadingState('auditing')
      Taro.showLoading({
        title: getLoadingText('auditing'),
        mask: true
      })

      const auditResult = await new Promise<ImageAuditResult>((resolve, reject) => {
        submitAuditTask(
          {
            imageUrl,
            options: {
              enableCache: true,
              timeout: 30000
            }
          },
          (status, progress) => {
            console.log('审核进度:', status, progress)
          },
          (result) => {
            console.log('审核成功:', result)
            resolve(result)
          },
          (error) => {
            console.error('审核失败:', error)
            reject(error)
          }
        )
      })

      // 第三步：检查审核结果
      if (auditResult.conclusion === AuditConclusion.PASS) {
        // 短暂延迟后继续业务处理
        await new Promise(resolve => setTimeout(resolve, 1000))
        // 第四步：执行业务逻辑
        setLoadingState('processing')
        Taro.showLoading({
          title: getLoadingText('processing'),
          mask: true
        })

        try {
          const taskId = await serverSdk.executeTemplate({
            imageUrl,
            templateCode: template.code
          })

          // 隐藏loading
          Taro.hideLoading()

          // 跳转到生成页面
          navigateTo({
            url: `/pages/generate/index?taskId=${taskId}&templateCode=${template.code}`
          })

        } catch (businessError) {
          // 业务处理失败
          Taro.hideLoading()
          Taro.showToast({
            title: '请等待生成中的任务完成后再尝试',
            icon: 'none',
            duration: 2000
          })
        }

      } else {
        // 审核不通过
        Taro.hideLoading()
        handleAuditFailure(auditResult)
      }

    } catch (error) {
      // 统一错误处理
      Taro.hideLoading()

      if (typeof loadingState === 'string' && loadingState === 'uploading') {
        Taro.showToast({
          title: '图片上传失败，请重试',
          icon: 'error',
          duration: 2000
        })
      } else if (typeof loadingState === 'string' && loadingState === 'auditing') {
        Taro.showToast({
          title: '图片审核失败，请重试',
          icon: 'error',
          duration: 2000
        })
      } else {
        Taro.showToast({
          title: error instanceof Error ? error.message : '处理失败',
          icon: 'error',
          duration: 2000
        })
      }

      console.error('模板处理错误:', error)
    } finally {
      setLoadingState(false)
    }
  }

  return (
    <View className='home'>
      <ScrollView
        className='home-scroll'
        scrollY
        enhanced
        showScrollbar={false}
        enablePassive
        bounces
        scrollWithAnimation={false}
        refresherEnabled
        refresherTriggered={refreshing}
        onRefresherRefresh={handleRefresh}
        refresherBackground='#f8f9fa'
        refresherDefaultStyle='black'
      >
        <View className='template-grid'>
          {templates.map((template) => (
            <TemplateCard
              key={template.code}
              template={template}
              onClick={handleTemplateClick}
            />
          ))}
        </View>
      </ScrollView>
    </View>
  )
}