import { useState, useMemo, useEffect } from 'react';
import {
  Box,
  Checkbox,
  Typography,
  TextField,
  Popover,
  InputAdornment,
} from '@mui/material';
import { ExpandMore, ChevronRight, ArrowDropDown } from '@mui/icons-material';
import { SimpleTreeView, TreeItem } from '@mui/x-tree-view';
import {
  CheckBoxOutlineBlank,
  CheckBox,
  IndeterminateCheckBox,
} from '@mui/icons-material';

const CollapsibleTree = ({
  columnTree,
  placeholder = 'Скрыть столбцы',
  placeholderSelect = 'Скрыто столбцов: ',
  selectedIds = [],
  onSelectNode,
}) => {
  const [expandedItems, setExpandedItems] = useState([]);
  const [anchorEl, setAnchorEl] = useState(null);
  const [selectedNodes, setSelectedNodes] = useState([]);

  useEffect(() => {
    setSelectedNodes(selectedIds);
  }, [selectedIds]);

  const handleExpandedItemsChange = (event, itemIds) => {
    setExpandedItems(itemIds);
  };

  const handleSelectAll = (isSelected) => {
    for (const col of columnTree) {
      onSelectNode?.(col, !isSelected);
    }
  };

  const getChildrenIds = (node) => {
    const getLeafColumn = (col) => {
      const hasColumns = col.columns && Array.isArray(col.columns);

      if (!hasColumns || col.columns.length === 0) {
        return [col];
      }

      const allChildrenAreLeaves = col.columns.every(
        child => !child.columns || !Array.isArray(child.columns) || child.columns.length === 0
      );

      if (allChildrenAreLeaves) {
        return col.columns;
      }

      return col.columns.flatMap((childCol) => getLeafColumn(childCol));
    };

    const leafColumns = getLeafColumn(node);
    return leafColumns.map((c) => c.id || c.accessorKey);
  };

  const isNodeChecked = (node) => {
    const childrenIds = getChildrenIds(node);
    const selectedChildren = childrenIds.filter((id) =>
      selectedNodes.includes(id)

      ,
    );

    if (selectedChildren.length === 0) return false;
    if (selectedChildren.length === childrenIds.length) return true;
    return 'indeterminate';
  };

  const handleNodeCheck = (node, isSelected) => {
    onSelectNode?.(node, !isSelected);
  };

  const getId = (column) => {
    const getFullColumnPath = (column) => {
      const ancestors = [];
      let current = column;

      while (current) {
        ancestors.unshift(current.id || current.accessorKey);
        current = current.parent;
      }

      return ancestors;
    };
    return getFullColumnPath(column).join('_');
  };

  const renderTree = (nodes) => {
    if (!nodes || nodes.length === 0) return null;

    return nodes.map((node) => {
      const checkStatus = isNodeChecked(node);
      return (
        <TreeItem
          key={node.id || node.accessorKey}
          itemId={String(getId(node))}
          label={
            <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
              <Checkbox
                onClick={(e) => e.stopPropagation()}
                checked={checkStatus === true}
                indeterminate={checkStatus === 'indeterminate'}
                onChange={() =>
                  handleNodeCheck(
                    node,
                    checkStatus === 'indeterminate' ? true : !checkStatus,
                  )
                }
                icon={<CheckBoxOutlineBlank />}
                checkedIcon={<CheckBox />}
                indeterminateIcon={<IndeterminateCheckBox />}
              />
              <Typography variant="body2">
                {node.columnDef?.header || node.name || node.header || 'Без названия'}
              </Typography>
            </Box>
          }
        >
          {node.columns && node.columns.length > 0 && renderTree(node.columns)}
        </TreeItem>
      );
    });
  };

  const treeElements = useMemo(() => {
    return columnTree ? renderTree(columnTree) : null;
  }, [columnTree, selectedNodes]);

  const handleOpen = (event) => {
    setAnchorEl(event.currentTarget);
  };

  const handleClose = () => {
    setAnchorEl(null);
  };

  const selectedCount = selectedNodes.length - 1; //1 колонка всегда скрыта

  const isAllSelected = () => {
    if (!columnTree) return false;
    let isSelect = true;
    for (const col of columnTree) {
      const isChecked = isNodeChecked(col);
      isSelect = isChecked === 'indeterminate' ? false : isChecked && isSelect;
    }
    return isSelect;
  };

  const open = Boolean(anchorEl);
  const id = open ? 'tree-popover' : undefined;

  const getDisplayValue = () => {
    if (selectedCount === 0) {
      return '';
    }
    return `${placeholderSelect} ${selectedCount}`;
  };

  return (
    <>
      <Box
        sx={{
          position: 'relative',
          width: '100%',
        }}
      >
        <TextField
          fullWidth
          placeholder={placeholder}
          value={getDisplayValue()}
          onClick={handleOpen}
          slotProps={{
            input: {
              readOnly: true,
              endAdornment: (
                <InputAdornment position="end">
                  <ArrowDropDown
                    sx={{
                      transform: open ? 'rotate(180deg)' : 'none',
                      transition: 'transform 0.2s',
                    }}
                  />
                </InputAdornment>
              ),
            },
          }}
          sx={{
            cursor: 'pointer',
            height: '2.5rem',
            padding: 0,
            '& .MuiInputBase-root': {
              cursor: 'pointer',
              height: '2.5rem',
            },
            '& input': {
              cursor: 'pointer',
            },
          }}
        />
      </Box>

      <Popover
        id={id}
        open={open}
        anchorEl={anchorEl}
        onClose={handleClose}
        anchorOrigin={{
          vertical: 'bottom',
          horizontal: 'left',
        }}
        transformOrigin={{
          vertical: 'top',
          horizontal: 'left',
        }}
        PaperProps={{
          sx: {
            width: anchorEl ? anchorEl.clientWidth : 300,
            maxHeight: 400,
            mt: 1,
            overflow: 'hidden',
          },
        }}
      >
        <Box sx={{ p: 1, borderBottom: '1px solid #e0e0e0' }}>
          <Checkbox
            checked={isAllSelected()}
            indeterminate={selectedCount > 0 && !isAllSelected()}
            onChange={(e) => handleSelectAll(e.target.checked)}
            icon={<CheckBoxOutlineBlank />}
            checkedIcon={<CheckBox />}
            indeterminateIcon={<IndeterminateCheckBox />}
          />
          <Typography variant="body2" component="span" sx={{ ml: 1 }}>
            Выбрать все
          </Typography>
        </Box>

        <SimpleTreeView
          expandedItems={expandedItems}
          onExpandedItemsChange={handleExpandedItemsChange}
          slots={{
            collapseIcon: ExpandMore,
            expandIcon: ChevronRight,
          }}
          sx={{
            maxHeight: 350,
            overflow: 'auto',
            p: 1,
          }}
        >
          {treeElements}
        </SimpleTreeView>
      </Popover>
    </>
  );
};

export default CollapsibleTree;