import type React from 'react';
import { useState, useRef, useMemo, useCallback } from 'react';
import {
  IconVideoFilled,
  Dialog,
  useUIKit,
} from '@tencentcloud/uikit-base-component-react';
import cs from 'classnames';
import {
  View,
  UserPicker,
  ConversationType,
  useChatContext,
  useLoginStore,
} from 'tuikit-atomicx-react/chat';
import { startCall } from '../../../utils/call';
import classes from './VideoCallPicker.module.scss';
import type { GroupMember, IUserPickerRef } from 'tuikit-atomicx-react/chat';

interface VideoCallPickerProps {
  /**
   * Label text for the button
   */
  label?: string;
  /**
   * Icon size in pixels
   */
  iconSize?: number;
  /**
   * Whether the button is disabled
   */
  disabled?: boolean;
  /**
   * Custom className for the button
   */
  className?: string;
  /**
   * Custom style for the button
   */
  style?: React.CSSProperties;
  /**
   * Custom icon slot
   */
  children?: React.ReactNode;
}

interface GroupMemberOption {
  key: string;
  label: string;
  avatarUrl?: string;
}

const VIDEO_CALL_TYPE = 2;
const MAX_GROUP_CALL_MEMBERS = 8;
const MIN_GROUP_CALL_MEMBERS = 1;

const VideoCallPicker = (props: VideoCallPickerProps) => {
  const {
    label = '',
    iconSize = 20,
    disabled = false,
    className,
    style,
    children,
  } = props;

  const { t } = useUIKit();
  const { loginUserInfo } = useLoginStore();
  const {
    activeConversation,
    memberList,
    hasMoreMembers,
    loadMembers,
    loadMoreMembers,
  } = useChatContext();

  const [isGroupCallDialogVisible, setIsGroupCallDialogVisible] = useState(false);
  const groupMemberPickerRef = useRef<IUserPickerRef>(null);

  const selfUserId = useMemo(() => loginUserInfo?.userID, [loginUserInfo]);

  const isPrivateConversation = useMemo(() => activeConversation?.type === ConversationType.C2C, [activeConversation]);

  const groupMemberOptions = useMemo<GroupMemberOption[]>(() => memberList?.map((member: GroupMember) => ({
    key: member.userID,
    label: member.nameCard || member.nickname || member.userID,
    ...(member.avatarURL ? { avatarUrl: member.avatarURL } : {}),
  })) ?? [], [memberList]);

  const canStartCall = useMemo(() => {
    if (!activeConversation || disabled) {
      return false;
    }
    return true;
  }, [activeConversation, disabled]);

  const initiatePrivateCall = useCallback((): void => {
    const peerUserId = activeConversation?.conversationID?.startsWith('C2C')
      ? activeConversation.conversationID.slice(3)
      : '';
    if (!peerUserId) {
      console.warn('No peer user ID found for C2C call');
      return;
    }

    try {
      startCall({
        userIDList: [peerUserId],
        type: VIDEO_CALL_TYPE,
      });
    } catch (error) {
      console.error('Failed to start private video call:', error);
    }
  }, [activeConversation?.conversationID]);

  const loadMoreGroupMembers = useCallback((): void => {
    if (activeConversation?.type !== ConversationType.Group) {
      return;
    }
    if (memberList.length === 0) {
      loadMembers();
      return;
    }
    if (hasMoreMembers) {
      loadMoreMembers();
    }
  }, [activeConversation?.type, memberList.length, hasMoreMembers, loadMembers, loadMoreMembers]);

  const showGroupCallDialog = useCallback((): void => {
    loadMoreGroupMembers();
    setIsGroupCallDialogVisible(true);
  }, [loadMoreGroupMembers]);

  const handleCloseGroupCallDialog = useCallback(() => {
    setIsGroupCallDialogVisible(false);
  }, []);

  const initiateGroupCall = useCallback((): void => {
    const currentGroupId = activeConversation?.conversationID?.startsWith('GROUP')
      ? activeConversation.conversationID.slice(5)
      : '';
    if (!groupMemberPickerRef.current || !currentGroupId) {
      console.warn('Missing group information for group call');
      return;
    }

    const selectedMembers = groupMemberPickerRef.current.getSelectedItems();
    if (!Array.isArray(selectedMembers) || selectedMembers.length === 0) {
      console.warn('No members selected for group call');
      return;
    }

    const selectedUserIds = selectedMembers.map(member => member.key);

    try {
      startCall({
        userIDList: selectedUserIds,
        chatGroupID: currentGroupId,
        type: VIDEO_CALL_TYPE,
      });

      handleCloseGroupCallDialog();
    } catch (error) {
      console.error('Failed to start group video call:', error);
    }
  }, [activeConversation, handleCloseGroupCallDialog]);

  const handleVideoCallClick = useCallback(() => {
    if (!canStartCall) {
      console.warn('Cannot start video call');
      return;
    }

    if (isPrivateConversation) {
      initiatePrivateCall();
    } else {
      showGroupCallDialog();
    }
  }, [canStartCall, isPrivateConversation, initiatePrivateCall, showGroupCallDialog]);

  const handleConfirmGroupCall = useCallback(() => {
    initiateGroupCall();
  }, [initiateGroupCall]);

  return (
    <>
      <View>
        <button
          type="button"
          className={cs(
            classes['video-call-picker__button'],
            {
              [classes['video-call-picker__button--disabled']]: disabled,
            },
            className,
          )}
          style={style}
          onClick={handleVideoCallClick}
          disabled={disabled}
          aria-label={label || 'Video Call'}
        >
          {children || (
            <IconVideoFilled
              className={classes['video-call-picker__icon']}
              size={`${iconSize}px`}
            />
          )}
        </button>

        <Dialog
          visible={isGroupCallDialogVisible}
          title={t('MessageInput.select_call_members')}
          cancelText={t('MessageInput.cancel')}
          onCancel={handleCloseGroupCallDialog}
          onClose={handleCloseGroupCallDialog}
          confirmText={t('MessageInput.initiate_call')}
          onConfirm={handleConfirmGroupCall}
          className={classes['group-call-dialog']}
        >
          <UserPicker
            ref={groupMemberPickerRef}
            displayMode="list"
            dataSource={groupMemberOptions}
            lockedItems={selfUserId ? [{ key: selfUserId }] : []}
            maxCount={MAX_GROUP_CALL_MEMBERS}
            minCount={MIN_GROUP_CALL_MEMBERS}
            onReachEnd={loadMoreGroupMembers}
          />
        </Dialog>
      </View>
    </>
  );
};

export { VideoCallPicker };
export type { VideoCallPickerProps };