import * as React from 'react';
import { TextField } from 'office-ui-fabric-react/lib/TextField';
import { Toggle } from 'office-ui-fabric-react/lib/Toggle';
import { Fabric } from 'office-ui-fabric-react/lib/Fabric';
import { Announced } from 'office-ui-fabric-react/lib/Announced';
import { DetailsList, DetailsListLayoutMode, Selection, SelectionMode, IColumn } from 'office-ui-fabric-react/lib/DetailsList';
import { MarqueeSelection } from 'office-ui-fabric-react/lib/MarqueeSelection';
import { mergeStyleSets } from 'office-ui-fabric-react/lib/Styling';

const classNames = mergeStyleSets({
  fileIconHeaderIcon: {
    padding: 0,
    fontSize: '16px'
  },
  fileIconCell: {
    textAlign: 'center',
    selectors: {
      '&:before': {
        content: '.',
        display: 'inline-block',
        verticalAlign: 'middle',
        height: '100%',
        width: '0px',
        visibility: 'hidden'
      }
    }
  },
  fileIconImg: {
    verticalAlign: 'middle',
    maxHeight: '16px',
    maxWidth: '16px'
  },
  controlWrapper: {
    display: 'flex',
    flexWrap: 'wrap'
  },
  exampleToggle: {
    display: 'inline-block',
    marginBottom: '10px',
    marginRight: '30px'
  },
  selectionDetails: {
    marginBottom: '20px'
  }
});
const controlStyles = {
  root: {
    margin: '0 30px 20px 0',
    maxWidth: '300px'
  }
};

export interface IDetailsListDocumentsExampleState {
  columns: IColumn[];
  items: IDocument[];
  selectionDetails: string;
  isModalSelection: boolean;
  isCompactMode: boolean;
  announcedMessage?: string;
}

export interface IDocument {
  key: string;
  name: string;
  value: string;
  iconName: string;
  fileType: string;
  modifiedBy: string;
  dateModified: string;
  dateModifiedValue: number;
  fileSize: string;
  fileSizeRaw: number;
}

export class DetailsListDocumentsExample extends React.Component<{}, IDetailsListDocumentsExampleState> {
  private _selection: Selection;
  private _allItems: IDocument[];

  constructor(props: {}) {
    super(props);

    this._allItems = _generateDocuments();

    const columns: IColumn[] = [
      {
        key: 'column1',
        name: 'File Type',
        className: classNames.fileIconCell,
        iconClassName: classNames.fileIconHeaderIcon,
        ariaLabel: 'Column operations for File type, Press to sort on File type',
        iconName: 'Page',
        isIconOnly: true,
        fieldName: 'name',
        minWidth: 16,
        maxWidth: 16,
        onColumnClick: this._onColumnClick,
        onRender: (item: IDocument) => {
          return <img src={item.iconName} className={classNames.fileIconImg} alt={item.fileType + ' file icon'} />;
        }
      },
      {
        key: 'column2',
        name: 'Name',
        fieldName: 'name',
        minWidth: 210,
        maxWidth: 350,
        isRowHeader: true,
        isResizable: true,
        isSorted: true,
        isSortedDescending: false,
        sortAscendingAriaLabel: 'Sorted A to Z',
        sortDescendingAriaLabel: 'Sorted Z to A',
        onColumnClick: this._onColumnClick,
        data: 'string',
        isPadded: true
      },
      {
        key: 'column3',
        name: 'Date Modified',
        fieldName: 'dateModifiedValue',
        minWidth: 70,
        maxWidth: 90,
        isResizable: true,
        onColumnClick: this._onColumnClick,
        data: 'number',
        onRender: (item: IDocument) => {
          return <span>{item.dateModified}</span>;
        },
        isPadded: true
      },
      {
        key: 'column4',
        name: 'Modified By',
        fieldName: 'modifiedBy',
        minWidth: 70,
        maxWidth: 90,
        isResizable: true,
        isCollapsible: true,
        data: 'string',
        onColumnClick: this._onColumnClick,
        onRender: (item: IDocument) => {
          return <span>{item.modifiedBy}</span>;
        },
        isPadded: true
      },
      {
        key: 'column5',
        name: 'File Size',
        fieldName: 'fileSizeRaw',
        minWidth: 70,
        maxWidth: 90,
        isResizable: true,
        isCollapsible: true,
        data: 'number',
        onColumnClick: this._onColumnClick,
        onRender: (item: IDocument) => {
          return <span>{item.fileSize}</span>;
        }
      }
    ];

    this._selection = new Selection({
      onSelectionChanged: () => {
        this.setState({
          selectionDetails: this._getSelectionDetails()
        });
      }
    });

    this.state = {
      items: this._allItems,
      columns: columns,
      selectionDetails: this._getSelectionDetails(),
      isModalSelection: false,
      isCompactMode: false,
      announcedMessage: undefined
    };
  }

  public render() {
    const { columns, isCompactMode, items, selectionDetails, isModalSelection, announcedMessage } = this.state;

    return (
      <Fabric>
        <div className={classNames.controlWrapper}>
          <Toggle
            label="Enable compact mode"
            checked={isCompactMode}
            onChange={this._onChangeCompactMode}
            onText="Compact"
            offText="Normal"
            styles={controlStyles}
          />
          <Toggle
            label="Enable modal selection"
            checked={isModalSelection}
            onChange={this._onChangeModalSelection}
            onText="Modal"
            offText="Normal"
            styles={controlStyles}
          />
          <TextField label="Filter by name:" onChange={this._onChangeText} styles={controlStyles} />
        </div>
        <div className={classNames.selectionDetails}>{selectionDetails}</div>
        {announcedMessage ? <Announced message={announcedMessage} /> : undefined}
        {isModalSelection ? (
          <MarqueeSelection selection={this._selection}>
            <DetailsList
              items={items}
              compact={isCompactMode}
              columns={columns}
              selectionMode={SelectionMode.multiple}
              getKey={this._getKey}
              setKey="multiple"
              layoutMode={DetailsListLayoutMode.justified}
              isHeaderVisible={true}
              selection={this._selection}
              selectionPreservedOnEmptyClick={true}
              onItemInvoked={this._onItemInvoked}
              enterModalSelectionOnTouch={true}
              ariaLabelForSelectionColumn="Toggle selection"
              ariaLabelForSelectAllCheckbox="Toggle selection for all items"
              checkButtonAriaLabel="Row checkbox"
            />
          </MarqueeSelection>
        ) : (
          <DetailsList
            items={items}
            compact={isCompactMode}
            columns={columns}
            selectionMode={SelectionMode.none}
            getKey={this._getKey}
            setKey="none"
            layoutMode={DetailsListLayoutMode.justified}
            isHeaderVisible={true}
            onItemInvoked={this._onItemInvoked}
          />
        )}
      </Fabric>
    );
  }

  public componentDidUpdate(previousProps: any, previousState: IDetailsListDocumentsExampleState) {
    if (previousState.isModalSelection !== this.state.isModalSelection && !this.state.isModalSelection) {
      this._selection.setAllSelected(false);
    }
  }

  private _getKey(item: any, index?: number): string {
    return item.key;
  }

  private _onChangeCompactMode = (ev: React.MouseEvent<HTMLElement>, checked: boolean): void => {
    this.setState({ isCompactMode: checked });
  };

  private _onChangeModalSelection = (ev: React.MouseEvent<HTMLElement>, checked: boolean): void => {
    this.setState({ isModalSelection: checked });
  };

  private _onChangeText = (ev: React.FormEvent<HTMLInputElement | HTMLTextAreaElement>, text: string): void => {
    this.setState({
      items: text ? this._allItems.filter(i => i.name.toLowerCase().indexOf(text) > -1) : this._allItems
    });
  };

  private _onItemInvoked(item: any): void {
    alert(`Item invoked: ${item.name}`);
  }

  private _getSelectionDetails(): string {
    const selectionCount = this._selection.getSelectedCount();

    switch (selectionCount) {
      case 0:
        return 'No items selected';
      case 1:
        return '1 item selected: ' + (this._selection.getSelection()[0] as IDocument).name;
      default:
        return `${selectionCount} items selected`;
    }
  }

  private _onColumnClick = (ev: React.MouseEvent<HTMLElement>, column: IColumn): void => {
    const { columns, items } = this.state;
    const newColumns: IColumn[] = columns.slice();
    const currColumn: IColumn = newColumns.filter(currCol => column.key === currCol.key)[0];
    newColumns.forEach((newCol: IColumn) => {
      if (newCol === currColumn) {
        currColumn.isSortedDescending = !currColumn.isSortedDescending;
        currColumn.isSorted = true;
        this.setState({
          announcedMessage: `${currColumn.name} is sorted ${currColumn.isSortedDescending ? 'descending' : 'ascending'}`
        });
      } else {
        newCol.isSorted = false;
        newCol.isSortedDescending = true;
      }
    });
    const newItems = _copyAndSort(items, currColumn.fieldName!, currColumn.isSortedDescending);
    this.setState({
      columns: newColumns,
      items: newItems
    });
  };
}

function _copyAndSort<T>(items: T[], columnKey: string, isSortedDescending?: boolean): T[] {
  const key = columnKey as keyof T;
  return items.slice(0).sort((a: T, b: T) => ((isSortedDescending ? a[key] < b[key] : a[key] > b[key]) ? 1 : -1));
}

function _generateDocuments() {
  const items: IDocument[] = [];
  for (let i = 0; i < 500; i++) {
    const randomDate = _randomDate(new Date(2012, 0, 1), new Date());
    const randomFileSize = _randomFileSize();
    const randomFileType = _randomFileIcon();
    let fileName = _lorem(2);
    fileName = fileName.charAt(0).toUpperCase() + fileName.slice(1).concat(`.${randomFileType.docType}`);
    let userName = _lorem(2);
    userName = userName
      .split(' ')
      .map((name: string) => name.charAt(0).toUpperCase() + name.slice(1))
      .join(' ');
    items.push({
      key: i.toString(),
      name: fileName,
      value: fileName,
      iconName: randomFileType.url,
      fileType: randomFileType.docType,
      modifiedBy: userName,
      dateModified: randomDate.dateFormatted,
      dateModifiedValue: randomDate.value,
      fileSize: randomFileSize.value,
      fileSizeRaw: randomFileSize.rawSize
    });
  }
  return items;
}

function _randomDate(start: Date, end: Date): { value: number; dateFormatted: string } {
  const date: Date = new Date(start.getTime() + Math.random() * (end.getTime() - start.getTime()));
  return {
    value: date.valueOf(),
    dateFormatted: date.toLocaleDateString()
  };
}

const FILE_ICONS: { name: string }[] = [
  { name: 'accdb' },
  { name: 'csv' },
  { name: 'docx' },
  { name: 'dotx' },
  { name: 'mpt' },
  { name: 'odt' },
  { name: 'one' },
  { name: 'onepkg' },
  { name: 'onetoc' },
  { name: 'pptx' },
  { name: 'pub' },
  { name: 'vsdx' },
  { name: 'xls' },
  { name: 'xlsx' },
  { name: 'xsn' }
];

function _randomFileIcon(): { docType: string; url: string } {
  const docType: string = FILE_ICONS[Math.floor(Math.random() * FILE_ICONS.length)].name;
  return {
    docType,
    url: `https://static2.sharepointonline.com/files/fabric/assets/brand-icons/document/svg/${docType}_16x1.svg`
  };
}

function _randomFileSize(): { value: string; rawSize: number } {
  const fileSize: number = Math.floor(Math.random() * 100) + 30;
  return {
    value: `${fileSize} KB`,
    rawSize: fileSize
  };
}

const LOREM_IPSUM = (
  'lorem ipsum dolor sit amet consectetur adipiscing elit sed do eiusmod tempor incididunt ut ' +
  'labore et dolore magna aliqua ut enim ad minim veniam quis nostrud exercitation ullamco laboris nisi ut ' +
  'aliquip ex ea commodo consequat duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore ' +
  'eu fugiat nulla pariatur excepteur sint occaecat cupidatat non proident sunt in culpa qui officia deserunt '
).split(' ');
let loremIndex = 0;
function _lorem(wordCount: number): string {
  const startIndex = loremIndex + wordCount > LOREM_IPSUM.length ? 0 : loremIndex;
  loremIndex = startIndex + wordCount;
  return LOREM_IPSUM.slice(startIndex, loremIndex).join(' ');
}
