import { useEffect } from "react";
import { useDebouncedCallback } from "use-debounce";
import _camelCase from "lodash/camelCase";

import _sortBy from "lodash/sortBy";

import useDoc, { DocActions } from "../useDoc";
import { FieldType } from "constants/fields";
import { arrayMover, formatPath } from "../../utils/fns";
import { db, deleteField } from "../../firebase";

export type ColumnConfig = {
  fieldName: string;
  key: string;
  name: string;
  type: FieldType;
  index: number;
  width?: number;
  editable?: boolean;
  config: { [key: string]: any };
  [key: string]: any;
};

const useTableConfig = (tablePath?: string) => {
  const [tableConfigState, documentDispatch] = useDoc({
    path: tablePath ? formatPath(tablePath) : "",
  });

  useEffect(() => {
    const { doc, columns, rowHeight } = tableConfigState;
    // TODO: REMOVE THIS
    // Copy columns, rowHeight to tableConfigState
    if (doc && columns !== doc.columns) {
      documentDispatch({ columns: doc.columns });
    }
    if (doc && rowHeight !== doc.rowHeight) {
      documentDispatch({ rowHeight: doc.rowHeight });
    }
  }, [tableConfigState.doc]);
  /**  used for specifying the table in use
   *  @param table firestore collection path
   */
  const setTable = (table: string) => {
    documentDispatch({
      path: formatPath(table),
      columns: [],
      doc: null,
      ref: db.doc(formatPath(table)),
      loading: true,
    });
  };
  /**  used for creating a new column
   *  @param name of column.
   *  @param type of column
   *  @param data additional column properties
   */
  const addColumn = (name: string, type: FieldType, data?: any) => {
    //TODO: validation
    const { columns } = tableConfigState;
    const newIndex = Object.keys(columns).length ?? 0;
    let updatedColumns = { ...columns };
    const key = _camelCase(name);
    updatedColumns[key] = { name, key, type, ...data, index: newIndex ?? 0 };
    documentDispatch({
      action: DocActions.update,
      data: { columns: updatedColumns },
    });
  };

  /**  used for updating the width of column
   *  @param index of column.
   *  @param width number of pixels, eg: 120
   */
  const [resize] = useDebouncedCallback((index: number, width: number) => {
    const { columns } = tableConfigState;
    const numberOfFixedColumns = Object.values(columns).filter(
      (col: any) => col.fixed && !col.hidden
    ).length;
    const columnsArray = _sortBy(
      Object.values(columns).filter((col: any) => !col.hidden && !col.fixed),
      "index"
    );
    let column: any = columnsArray[index - numberOfFixedColumns];
    column.width = width;
    let updatedColumns = columns;
    updatedColumns[column.key] = column;
    documentDispatch({
      action: DocActions.update,
      data: { columns: updatedColumns },
    });
  }, 1000);
  // type updatable = { field: string; value: unknown };

  /**  used for updating column properties such as type,name etc.
   *  @param index of column.
   *  @param {updatable[]} updatables properties to be updated
   */
  const updateColumn = (key: string, updates: any) => {
    const { columns } = tableConfigState;

    const updatedColumns = {
      ...columns,
      [key]: { ...columns[key], ...updates },
    };

    documentDispatch({
      action: DocActions.update,
      data: { columns: updatedColumns },
    });
  };
  /** remove column by index
   *  @param index of column.
   */
  const remove = (key: string) => {
    const { columns } = tableConfigState;
    let updatedColumns = columns;
    updatedColumns[key] = deleteField();
    documentDispatch({
      action: DocActions.update,
      data: { columns: updatedColumns },
    });
  };
  /** reorder columns by key
   * @param draggedColumnKey column being repositioned.
   * @param droppedColumnKey column being .
   */
  const reorder = (draggedColumnKey: string, droppedColumnKey: string) => {
    const { columns } = tableConfigState;
    const oldIndex = columns[draggedColumnKey].index;
    const newIndex = columns[droppedColumnKey].index;
    const columnsArray = _sortBy(Object.values(columns), "index");
    arrayMover(columnsArray, oldIndex, newIndex);
    let updatedColumns = columns;

    columnsArray
      .filter((c) => c) // arrayMover has a bug creating undefined items
      .forEach((column: any, index) => {
        updatedColumns[column.key] = { ...column, index };
      });
    documentDispatch({
      action: DocActions.update,
      data: { columns: updatedColumns },
    });
  };
  /** changing table configuration used for things such as row height
   * @param key name of parameter eg. rowHeight
   * @param value new value eg. 65
   */
  const updateConfig = (key: string, value: unknown) => {
    documentDispatch({
      action: DocActions.update,
      data: { [key]: value },
    });
  };
  const actions = {
    updateColumn,
    updateConfig,
    addColumn,
    resize,
    setTable,
    remove,
    reorder,
  };
  return [tableConfigState, actions];
};

export default useTableConfig;