import * as React from 'react';
import { useState, useCallback, useMemo } from 'react';
import DownOutlined from '@ant-design/icons/DownOutlined';
import { convertDataToEntities } from 'rc-tree/lib/utils/treeUtil';
import { conductCheck } from 'rc-tree/lib/utils/conductUtil';
import { arrAdd, arrDel } from 'rc-tree/lib/util';
import { DataNode, GetCheckDisabled } from 'rc-tree/lib/interface';
import { INTERNAL_COL_DEFINE } from 'rc-table';
import { FixedType } from 'rc-table/lib/interface';
import useMergedState from 'rc-util/lib/hooks/useMergedState';
import Checkbox, { CheckboxProps } from '../../checkbox';
import Dropdown from '../../dropdown';
import Menu from '../../menu';
import Radio from '../../radio';
import devWarning from '../../_util/devWarning';
import {
  TableRowSelection,
  Key,
  ColumnsType,
  ColumnType,
  GetRowKey,
  TableLocale,
  SelectionItem,
  TransformColumns,
  ExpandType,
  GetPopupContainer,
} from '../interface';

// TODO: warning if use ajax!!!

export const SELECTION_COLUMN = {} as const;
export const SELECTION_ALL = 'SELECT_ALL' as const;
export const SELECTION_INVERT = 'SELECT_INVERT' as const;
export const SELECTION_NONE = 'SELECT_NONE' as const;

const EMPTY_LIST: React.Key[] = [];

interface UseSelectionConfig<RecordType> {
  prefixCls: string;
  pageData: RecordType[];
  data: RecordType[];
  getRowKey: GetRowKey<RecordType>;
  getRecordByKey: (key: Key) => RecordType;
  expandType: ExpandType;
  childrenColumnName: string;
  locale: TableLocale;
  getPopupContainer?: GetPopupContainer;
}

export type INTERNAL_SELECTION_ITEM =
  | SelectionItem
  | typeof SELECTION_ALL
  | typeof SELECTION_INVERT
  | typeof SELECTION_NONE;

function flattenData<RecordType>(
  data: RecordType[] | undefined,
  childrenColumnName: string,
): RecordType[] {
  let list: RecordType[] = [];
  (data || []).forEach(record => {
    list.push(record);

    if (record && typeof record === 'object' && childrenColumnName in record) {
      list = [
        ...list,
        ...flattenData<RecordType>((record as any)[childrenColumnName], childrenColumnName),
      ];
    }
  });

  return list;
}

export default function useSelection<RecordType>(
  rowSelection: TableRowSelection<RecordType> | undefined,
  config: UseSelectionConfig<RecordType>,
): [TransformColumns<RecordType>, Set<Key>] {
  const {
    preserveSelectedRowKeys,
    selectedRowKeys,
    defaultSelectedRowKeys,
    getCheckboxProps,
    onChange: onSelectionChange,
    onSelect,
    onSelectAll,
    onSelectInvert,
    onSelectNone,
    onSelectMultiple,
    columnWidth: selectionColWidth,
    type: selectionType,
    selections,
    fixed,
    renderCell: customizeRenderCell,
    hideSelectAll,
    checkStrictly = true,
  } = rowSelection || {};

  const {
    prefixCls,
    data,
    pageData,
    getRecordByKey,
    getRowKey,
    expandType,
    childrenColumnName,
    locale: tableLocale,
    getPopupContainer,
  } = config;

  // ========================= Keys =========================
  const [mergedSelectedKeys, setMergedSelectedKeys] = useMergedState(
    selectedRowKeys || defaultSelectedRowKeys || EMPTY_LIST,
    {
      value: selectedRowKeys,
    },
  );

  // ======================== Caches ========================
  const preserveRecordsRef = React.useRef(new Map<Key, RecordType>());

  const updatePreserveRecordsCache = useCallback(
    (keys: Key[]) => {
      if (preserveSelectedRowKeys) {
        const newCache = new Map<Key, RecordType>();
        // Keep key if mark as preserveSelectedRowKeys
        keys.forEach(key => {
          let record = getRecordByKey(key);

          if (!record && preserveRecordsRef.current.has(key)) {
            record = preserveRecordsRef.current.get(key)!;
          }

          newCache.set(key, record);
        });
        // Refresh to new cache
        preserveRecordsRef.current = newCache;
      }
    },
    [getRecordByKey, preserveSelectedRowKeys],
  );

  // Update cache with selectedKeys
  React.useEffect(() => {
    updatePreserveRecordsCache(mergedSelectedKeys);
  }, [mergedSelectedKeys]);

  const { keyEntities } = useMemo(
    () =>
      checkStrictly
        ? { keyEntities: null }
        : convertDataToEntities(data as unknown as DataNode[], {
            externalGetKey: getRowKey as any,
            childrenPropName: childrenColumnName,
          }),
    [data, getRowKey, checkStrictly, childrenColumnName],
  );

  // Get flatten data
  const flattedData = useMemo(
    () => flattenData(pageData, childrenColumnName),
    [pageData, childrenColumnName],
  );

  // Get all checkbox props
  const checkboxPropsMap = useMemo(() => {
    const map = new Map<Key, Partial<CheckboxProps>>();
    flattedData.forEach((record, index) => {
      const key = getRowKey(record, index);
      const checkboxProps = (getCheckboxProps ? getCheckboxProps(record) : null) || {};
      map.set(key, checkboxProps);

      if (
        process.env.NODE_ENV !== 'production' &&
        ('checked' in checkboxProps || 'defaultChecked' in checkboxProps)
      ) {
        devWarning(
          false,
          'Table',
          'Do not set `checked` or `defaultChecked` in `getCheckboxProps`. Please use `selectedRowKeys` instead.',
        );
      }
    });
    return map;
  }, [flattedData, getRowKey, getCheckboxProps]);

  const isCheckboxDisabled: GetCheckDisabled<RecordType> = useCallback(
    (r: RecordType) => !!checkboxPropsMap.get(getRowKey(r))?.disabled,
    [checkboxPropsMap, getRowKey],
  );

  const [derivedSelectedKeys, derivedHalfSelectedKeys] = useMemo(() => {
    if (checkStrictly) {
      return [mergedSelectedKeys || [], []];
    }
    const { checkedKeys, halfCheckedKeys } = conductCheck(
      mergedSelectedKeys,
      true,
      keyEntities as any,
      isCheckboxDisabled as any,
    );
    return [checkedKeys || [], halfCheckedKeys];
  }, [mergedSelectedKeys, checkStrictly, keyEntities, isCheckboxDisabled]);

  const derivedSelectedKeySet: Set<Key> = useMemo(() => {
    const keys = selectionType === 'radio' ? derivedSelectedKeys.slice(0, 1) : derivedSelectedKeys;
    return new Set(keys);
  }, [derivedSelectedKeys, selectionType]);
  const derivedHalfSelectedKeySet = useMemo(
    () => (selectionType === 'radio' ? new Set() : new Set(derivedHalfSelectedKeys)),
    [derivedHalfSelectedKeys, selectionType],
  );

  // Save last selected key to enable range selection
  const [lastSelectedKey, setLastSelectedKey] = useState<Key | null>(null);

  // Reset if rowSelection reset
  React.useEffect(() => {
    if (!rowSelection) {
      setMergedSelectedKeys(EMPTY_LIST);
    }
  }, [!!rowSelection]);

  const setSelectedKeys = useCallback(
    (keys: Key[]) => {
      let availableKeys: Key[];
      let records: RecordType[];

      updatePreserveRecordsCache(keys);

      if (preserveSelectedRowKeys) {
        availableKeys = keys;
        records = keys.map(key => preserveRecordsRef.current.get(key)!);
      } else {
        // Filter key which not exist in the `dataSource`
        availableKeys = [];
        records = [];

        keys.forEach(key => {
          const record = getRecordByKey(key);
          if (record !== undefined) {
            availableKeys.push(key);
            records.push(record);
          }
        });
      }

      setMergedSelectedKeys(availableKeys);

      onSelectionChange?.(availableKeys, records);
    },
    [setMergedSelectedKeys, getRecordByKey, onSelectionChange, preserveSelectedRowKeys],
  );

  // ====================== Selections ======================
  // Trigger single `onSelect` event
  const triggerSingleSelection = useCallback(
    (key: Key, selected: boolean, keys: Key[], event: Event) => {
      if (onSelect) {
        const rows = keys.map(k => getRecordByKey(k));
        onSelect(getRecordByKey(key), selected, rows, event);
      }

      setSelectedKeys(keys);
    },
    [onSelect, getRecordByKey, setSelectedKeys],
  );

  const mergedSelections = useMemo<SelectionItem[] | null>(() => {
    if (!selections || hideSelectAll) {
      return null;
    }

    const selectionList: INTERNAL_SELECTION_ITEM[] =
      selections === true ? [SELECTION_ALL, SELECTION_INVERT, SELECTION_NONE] : selections;

    return selectionList.map((selection: INTERNAL_SELECTION_ITEM) => {
      if (selection === SELECTION_ALL) {
        return {
          key: 'all',
          text: tableLocale.selectionAll,
          onSelect() {
            setSelectedKeys(
              data
                .map((record, index) => getRowKey(record, index))
                .filter(key => {
                  const checkProps = checkboxPropsMap.get(key);
                  return !checkProps?.disabled || derivedSelectedKeySet.has(key);
                }),
            );
          },
        };
      }
      if (selection === SELECTION_INVERT) {
        return {
          key: 'invert',
          text: tableLocale.selectInvert,
          onSelect() {
            const keySet = new Set(derivedSelectedKeySet);
            pageData.forEach((record, index) => {
              const key = getRowKey(record, index);
              const checkProps = checkboxPropsMap.get(key);

              if (!checkProps?.disabled) {
                if (keySet.has(key)) {
                  keySet.delete(key);
                } else {
                  keySet.add(key);
                }
              }
            });

            const keys = Array.from(keySet);
            if (onSelectInvert) {
              devWarning(
                false,
                'Table',
                '`onSelectInvert` will be removed in future. Please use `onChange` instead.',
              );
              onSelectInvert(keys);
            }

            setSelectedKeys(keys);
          },
        };
      }
      if (selection === SELECTION_NONE) {
        return {
          key: 'none',
          text: tableLocale.selectNone,
          onSelect() {
            onSelectNone?.();
            setSelectedKeys(
              Array.from(derivedSelectedKeySet).filter(key => {
                const checkProps = checkboxPropsMap.get(key);
                return checkProps?.disabled;
              }),
            );
          },
        };
      }
      return selection as SelectionItem;
    });
  }, [selections, derivedSelectedKeySet, pageData, getRowKey, onSelectInvert, setSelectedKeys]);

  // ======================= Columns ========================
  const transformColumns = useCallback(
    (columns: ColumnsType<RecordType>): ColumnsType<RecordType> => {
      // >>>>>>>>>>> Skip if not exists `rowSelection`
      if (!rowSelection) {
        if (process.env.NODE_ENV !== 'production') {
          devWarning(
            !columns.includes(SELECTION_COLUMN),
            'Table',
            '`rowSelection` is not config but `SELECTION_COLUMN` exists in the `columns`.',
          );
        }

        return columns.filter(col => col !== SELECTION_COLUMN);
      }

      // >>>>>>>>>>> Support selection
      let cloneColumns = [...columns];
      const keySet = new Set(derivedSelectedKeySet);

      // Record key only need check with enabled
      const recordKeys = flattedData
        .map(getRowKey)
        .filter(key => !checkboxPropsMap.get(key)!.disabled);
      const checkedCurrentAll = recordKeys.every(key => keySet.has(key));
      const checkedCurrentSome = recordKeys.some(key => keySet.has(key));

      const onSelectAllChange = () => {
        const changeKeys: Key[] = [];

        if (checkedCurrentAll) {
          recordKeys.forEach(key => {
            keySet.delete(key);
            changeKeys.push(key);
          });
        } else {
          recordKeys.forEach(key => {
            if (!keySet.has(key)) {
              keySet.add(key);
              changeKeys.push(key);
            }
          });
        }

        const keys = Array.from(keySet);

        onSelectAll?.(
          !checkedCurrentAll,
          keys.map(k => getRecordByKey(k)),
          changeKeys.map(k => getRecordByKey(k)),
        );

        setSelectedKeys(keys);
      };

      // ===================== Render =====================
      // Title Cell
      let title: React.ReactNode;
      if (selectionType !== 'radio') {
        let customizeSelections: React.ReactNode;
        if (mergedSelections) {
          const menu = (
            <Menu getPopupContainer={getPopupContainer}>
              {mergedSelections.map((selection, index) => {
                const { key, text, onSelect: onSelectionClick } = selection;
                return (
                  <Menu.Item
                    key={key || index}
                    onClick={() => {
                      onSelectionClick?.(recordKeys);
                    }}
                  >
                    {text}
                  </Menu.Item>
                );
              })}
            </Menu>
          );
          customizeSelections = (
            <div className={`${prefixCls}-selection-extra`}>
              <Dropdown overlay={menu} getPopupContainer={getPopupContainer}>
                <span>
                  <DownOutlined />
                </span>
              </Dropdown>
            </div>
          );
        }

        const allDisabledData = flattedData
          .map((record, index) => {
            const key = getRowKey(record, index);
            const checkboxProps = checkboxPropsMap.get(key) || {};
            return { checked: keySet.has(key), ...checkboxProps };
          })
          .filter(({ disabled }) => disabled);

        const allDisabled =
          !!allDisabledData.length && allDisabledData.length === flattedData.length;

        const allDisabledAndChecked =
          allDisabled && allDisabledData.every(({ checked }) => checked);
        const allDisabledSomeChecked =
          allDisabled && allDisabledData.some(({ checked }) => checked);

        title = !hideSelectAll && (
          <div className={`${prefixCls}-selection`}>
            <Checkbox
              checked={
                !allDisabled ? !!flattedData.length && checkedCurrentAll : allDisabledAndChecked
              }
              indeterminate={
                !allDisabled
                  ? !checkedCurrentAll && checkedCurrentSome
                  : !allDisabledAndChecked && allDisabledSomeChecked
              }
              onChange={onSelectAllChange}
              disabled={flattedData.length === 0 || allDisabled}
              skipGroup
            />
            {customizeSelections}
          </div>
        );
      }

      // Body Cell
      let renderCell: (
        _: RecordType,
        record: RecordType,
        index: number,
      ) => { node: React.ReactNode; checked: boolean };
      if (selectionType === 'radio') {
        renderCell = (_, record, index) => {
          const key = getRowKey(record, index);
          const checked = keySet.has(key);

          return {
            node: (
              <Radio
                {...checkboxPropsMap.get(key)}
                checked={checked}
                onClick={e => e.stopPropagation()}
                onChange={event => {
                  if (!keySet.has(key)) {
                    triggerSingleSelection(key, true, [key], event.nativeEvent);
                  }
                }}
              />
            ),
            checked,
          };
        };
      } else {
        renderCell = (_, record, index) => {
          const key = getRowKey(record, index);
          const checked = keySet.has(key);
          const indeterminate = derivedHalfSelectedKeySet.has(key);
          const checkboxProps = checkboxPropsMap.get(key);
          let mergedIndeterminate: boolean;
          if (expandType === 'nest') {
            mergedIndeterminate = indeterminate;
            devWarning(
              typeof checkboxProps?.indeterminate !== 'boolean',
              'Table',
              'set `indeterminate` using `rowSelection.getCheckboxProps` is not allowed with tree structured dataSource.',
            );
          } else {
            mergedIndeterminate = checkboxProps?.indeterminate ?? indeterminate;
          }
          // Record checked
          return {
            node: (
              <Checkbox
                {...checkboxProps}
                indeterminate={mergedIndeterminate}
                checked={checked}
                skipGroup
                onClick={e => e.stopPropagation()}
                onChange={({ nativeEvent }) => {
                  const { shiftKey } = nativeEvent;

                  let startIndex: number = -1;
                  let endIndex: number = -1;

                  // Get range of this
                  if (shiftKey && checkStrictly) {
                    const pointKeys = new Set([lastSelectedKey, key]);

                    recordKeys.some((recordKey, recordIndex) => {
                      if (pointKeys.has(recordKey)) {
                        if (startIndex === -1) {
                          startIndex = recordIndex;
                        } else {
                          endIndex = recordIndex;
                          return true;
                        }
                      }

                      return false;
                    });
                  }

                  if (endIndex !== -1 && startIndex !== endIndex && checkStrictly) {
                    // Batch update selections
                    const rangeKeys = recordKeys.slice(startIndex, endIndex + 1);
                    const changedKeys: Key[] = [];

                    if (checked) {
                      rangeKeys.forEach(recordKey => {
                        if (keySet.has(recordKey)) {
                          changedKeys.push(recordKey);
                          keySet.delete(recordKey);
                        }
                      });
                    } else {
                      rangeKeys.forEach(recordKey => {
                        if (!keySet.has(recordKey)) {
                          changedKeys.push(recordKey);
                          keySet.add(recordKey);
                        }
                      });
                    }

                    const keys = Array.from(keySet);
                    onSelectMultiple?.(
                      !checked,
                      keys.map(recordKey => getRecordByKey(recordKey)),
                      changedKeys.map(recordKey => getRecordByKey(recordKey)),
                    );

                    setSelectedKeys(keys);
                  } else {
                    // Single record selected
                    const originCheckedKeys = derivedSelectedKeys;
                    if (checkStrictly) {
                      const checkedKeys = checked
                        ? arrDel(originCheckedKeys, key)
                        : arrAdd(originCheckedKeys, key);
                      triggerSingleSelection(key, !checked, checkedKeys, nativeEvent);
                    } else {
                      // Always fill first
                      const result = conductCheck(
                        [...originCheckedKeys, key],
                        true,
                        keyEntities as any,
                        isCheckboxDisabled as any,
                      );
                      const { checkedKeys, halfCheckedKeys } = result;
                      let nextCheckedKeys = checkedKeys;

                      // If remove, we do it again to correction
                      if (checked) {
                        const tempKeySet = new Set(checkedKeys);
                        tempKeySet.delete(key);
                        nextCheckedKeys = conductCheck(
                          Array.from(tempKeySet),
                          { checked: false, halfCheckedKeys },
                          keyEntities as any,
                          isCheckboxDisabled as any,
                        ).checkedKeys;
                      }

                      triggerSingleSelection(key, !checked, nextCheckedKeys, nativeEvent);
                    }
                  }

                  setLastSelectedKey(key);
                }}
              />
            ),
            checked,
          };
        };
      }

      const renderSelectionCell = (_: any, record: RecordType, index: number) => {
        const { node, checked } = renderCell(_, record, index);

        if (customizeRenderCell) {
          return customizeRenderCell(checked, record, index, node);
        }

        return node;
      };

      // Insert selection column if not exist
      if (!cloneColumns.includes(SELECTION_COLUMN)) {
        // Always after expand icon
        if (
          cloneColumns.findIndex(
            (col: any) => col[INTERNAL_COL_DEFINE]?.columnType === 'EXPAND_COLUMN',
          ) === 0
        ) {
          const [expandColumn, ...restColumns] = cloneColumns;
          cloneColumns = [expandColumn, SELECTION_COLUMN, ...restColumns];
        } else {
          // Normal insert at first column
          cloneColumns = [SELECTION_COLUMN, ...cloneColumns];
        }
      }

      // Deduplicate selection column
      const selectionColumnIndex = cloneColumns.indexOf(SELECTION_COLUMN);
      if (
        process.env.NODE_ENV !== 'production' &&
        cloneColumns.filter(col => col === SELECTION_COLUMN).length > 1
      ) {
        devWarning(false, 'Table', 'Multiple `SELECTION_COLUMN` exist in `columns`.');
      }
      cloneColumns = cloneColumns.filter(
        (column, index) => column !== SELECTION_COLUMN || index === selectionColumnIndex,
      );

      // Fixed column logic
      const prevCol: ColumnType<RecordType> & Record<string, any> =
        cloneColumns[selectionColumnIndex - 1];
      const nextCol: ColumnType<RecordType> & Record<string, any> =
        cloneColumns[selectionColumnIndex + 1];

      let mergedFixed: FixedType | undefined = fixed;

      if (mergedFixed === undefined) {
        if (nextCol?.fixed !== undefined) {
          mergedFixed = nextCol.fixed;
        } else if (prevCol?.fixed !== undefined) {
          mergedFixed = prevCol.fixed;
        }
      }

      if (
        mergedFixed &&
        prevCol &&
        prevCol[INTERNAL_COL_DEFINE]?.columnType === 'EXPAND_COLUMN' &&
        prevCol.fixed === undefined
      ) {
        prevCol.fixed = mergedFixed;
      }

      // Replace with real selection column
      const selectionColumn = {
        fixed: mergedFixed,
        width: selectionColWidth,
        className: `${prefixCls}-selection-column`,
        title: rowSelection.columnTitle || title,
        render: renderSelectionCell,
        [INTERNAL_COL_DEFINE]: {
          className: `${prefixCls}-selection-col`,
        },
      };

      return cloneColumns.map(col => (col === SELECTION_COLUMN ? selectionColumn : col));
    },
    [
      getRowKey,
      flattedData,
      rowSelection,
      derivedSelectedKeys,
      derivedSelectedKeySet,
      derivedHalfSelectedKeySet,
      selectionColWidth,
      mergedSelections,
      expandType,
      lastSelectedKey,
      checkboxPropsMap,
      onSelectMultiple,
      triggerSingleSelection,
      isCheckboxDisabled,
    ],
  );

  return [transformColumns, derivedSelectedKeySet];
}