import React, { useMemo } from 'react';
import { Button, Flex, message, Modal } from 'antd';
import { useSelector } from 'react-redux';
import { RootState, useAppDispatch } from '@/states/store';
import {
  selectGridLayout,
  selectSelectedViewers,
} from '@/states/view/viewerContainerSlice';
import { 
  judgeImageThunk,
  saveImageAsThunk 
} from '@/states/exam/bodyPositionListSlice';
import { getDcmImageUrl } from '@/API/bodyPosition';
import Icon from '@/components/Icon';
import { useButtonAvailability } from '@/utils/useButtonAvailability';

/**
 * 图像状态控制组件
 * 
 * 功能：
 * - 拒绝按钮：将图像标记为拒绝状态
 * - 恢复按钮：将已拒绝的图像恢复为接受状态
 * - 另存为按钮：预留功能（当前禁用）
 * 
 * 业务规则：
 * - 仅在单分格模式（1x1）下显示拒绝/恢复按钮
 * - 拒绝和恢复按钮互斥显示，基于 judged_status
 * - 另存为按钮始终可见但禁用
 */
const ImageStateControl: React.FC = () => {
  const dispatch = useAppDispatch();
  const { disabled:ofReject } = useButtonAvailability('拒绝');
  const { disabled:ofRecover } = useButtonAvailability('恢复');
  const { disabled:ofSaveAs } = useButtonAvailability('另存为');
  // 获取必要的状态
  const selectedViewers = useSelector(selectSelectedViewers);
  const gridLayout = useSelector(selectGridLayout);
  const bodyPositionList = useSelector(
    (state: RootState) => state.bodyPositionList.bodyPositions
  );
  const loading = useSelector(
    (state: RootState) => state.bodyPositionList.loading
  );

  // 查找当前选中的图像
  const selectedImage = useMemo(() => {
    if (selectedViewers.length === 0) return null;
    const imageUrl = selectedViewers[0];
    return bodyPositionList.find(
      (bp) => getDcmImageUrl(bp.sop_instance_uid) === imageUrl
    );
  }, [selectedViewers, bodyPositionList]);

  // 判断按钮可见性
  const isSingleGrid = gridLayout === '1x1';
  const judgedStatus = selectedImage?.dview?.judged_status || '';
  const showRejectButton = isSingleGrid && judgedStatus !== 'Reject';
  const showRestoreButton = isSingleGrid && judgedStatus === 'Reject';

  // 拒绝按钮处理函数
  const handleReject = async () => {
    if (!selectedImage) return;
    Modal.confirm({
      title: '确认拒绝',
      content: `确定要拒绝选中的图像吗？`,
      okText: '确认拒绝',
      cancelText: '取消',
      okButtonProps: {
        danger: true,
        'data-testid': 'modal-confirm-delete'
      },
      cancelButtonProps: {
        'data-testid': 'modal-cancel-delete'
      },
      centered: true,
      onOk: async () => {
        try {
          await dispatch(
            judgeImageThunk({
              sopInstanceUid: selectedImage.sop_instance_uid,
              accept: false,
            })
          ).unwrap();
          message.success('图像已拒绝');
        } catch (err) {
          console.error('拒绝图像失败:', err);
          message.error('拒绝图像失败');
        }
      },
    });
  };

  // 恢复按钮处理函数
  const handleRestore = async () => {
    if (!selectedImage) return;

    try {
      await dispatch(
        judgeImageThunk({
          sopInstanceUid: selectedImage.sop_instance_uid,
          accept: true,
        })
      ).unwrap();

      message.success('图像已恢复');
    } catch (err) {
      console.error('恢复图像失败:', err);
      message.error('恢复图像失败');
    }
  };

  // 另存为按钮处理函数
  const handleSaveAs = async () => {
    if (!selectedImage) return;

    Modal.confirm({
      title: '确认另存为',
      content: `确定要复制选中的图像吗？`,
      okText: '确认',
      cancelText: '取消',
      centered: true,
      onOk: async () => {
        try {
          await dispatch(
            saveImageAsThunk({
              sopInstanceUid: selectedImage.sop_instance_uid,
              studyId: selectedImage.study_id || '',
            })
          ).unwrap();
          message.success('图像另存为成功，体位列表已更新');
        } catch (err) {
          console.error('图像另存为失败:', err);
          message.error('图像另存为失败');
        }
      },
    });
  };

  // 另存为按钮显示条件：单分格 + 有选中图像 + 图像已曝光
  const showSaveAsButton = 
    isSingleGrid && 
    selectedImage !== null && 
    selectedImage?.dview?.expose_status === 'Exposed';

  return (
    <Flex gap="small" align="center" justify="start">
      {showRejectButton && (
        <Button
          onClick={handleReject}
          loading={loading}
          icon={
            <Icon
              module="module-process"
              name="RejectImage"
              userId="base"
              theme="default"
              size="2x"
              state="normal"
            />
          }
          style={{
            width: '1.5rem',
            height: '1.5rem',
            padding: 0,
          }}
          disabled={ofReject}
          title="拒绝"
        />
      )}
      {showRestoreButton && (
        <Button
          onClick={handleRestore}
          loading={loading}
          icon={
            <Icon
              module="module-process"
              name="RestoreImage"
              userId="base"
              theme="default"
              size="2x"
              state="normal"
            />
          }
          style={{
            width: '1.5rem',
            height: '1.5rem',
            padding: 0,
          }}
          title="恢复"
          disabled={ofRecover}
        />
      )}
      {showSaveAsButton && (
        <Button
          onClick={handleSaveAs}
          loading={loading}
          icon={
            <Icon
              module="module-process"
              name="SaveAs"
              userId="base"
              theme="default"
              size="2x"
              state="normal"
            />
          }
          style={{
            width: '1.5rem',
            height: '1.5rem',
            padding: 0,
          }}
          title="另存为"
          disabled={ofSaveAs}
        />
      )}
    </Flex>
  );
};

export default ImageStateControl;