import { View, ScrollView, Canvas } 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 [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) => {
    try {
      // 第一步：选择并上传图片
      const imageCount = template.templateType === '2image-to-video' ? 2 : 1;
      const imageUrl = await sdk.chooseAndUploadImage({
        count: imageCount,
        onImageSelected: () => {
          Taro.showLoading({
            title: getLoadingText('uploading'),
            mask: true,
          });
        },
        onProgress: () => {
          Taro.showLoading({
            title: `请稍后...`,
            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
        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/result/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
        handleAuditFailure(auditResult);
      }
    } catch (error: any) {
      if (error.errMsg.includes('chooseImage:fail cancel')) {
        return;
      }
      // 统一错误处理
      Taro.hideLoading();
      Taro.showToast({
        title: '图片审核失败，请重试',
        icon: 'error',
        duration: 2000,
      });
    } finally {
    }
  };

  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>
  );
}