import React, {PropTypes, PureComponent} from 'react';
import autobind from 'autobind-decorator';
import ReactDOM from 'react-dom';
import {DragSource, DropTarget} from 'react-dnd';
import classnames from 'classnames';
import RequestGroupActionsDropdown from '../dropdowns/request-group-actions-dropdown';
import SidebarRequestRow from './sidebar-request-row';
import {trackEvent} from '../../../analytics/index';
import * as misc from '../../../common/misc';

@autobind
class SidebarRequestGroupRow extends PureComponent {
  constructor (props) {
    super(props);
    this.state = {
      dragDirection: 0
    };
  }

  _setRequestGroupActionsDropdownRef (n) {
    this._requestGroupActionsDropdown = n;
  }

  _handleCollapse () {
    const {requestGroup, handleSetRequestGroupCollapsed, isCollapsed} = this.props;
    handleSetRequestGroupCollapsed(requestGroup._id, !isCollapsed);
    trackEvent('Folder', 'Toggle Visible', !isCollapsed ? 'Close' : 'Open');
  }

  _handleShowActions (e) {
    e.preventDefault();
    this._requestGroupActionsDropdown.show();
  }

  setDragDirection (dragDirection) {
    if (dragDirection !== this.state.dragDirection) {
      this.setState({dragDirection});
    }
  }

  render () {
    const {
      connectDragSource,
      connectDropTarget,
      moveDoc,
      children,
      requestGroup,
      isCollapsed,
      isActive,
      handleCreateRequest,
      handleCreateRequestGroup,
      handleDuplicateRequestGroup,
      isDragging,
      isDraggingOver,
      workspace
    } = this.props;

    const {dragDirection} = this.state;

    let folderIconClass = 'fa-folder';

    folderIconClass += isCollapsed ? '' : '-open';
    folderIconClass += isActive ? '' : '-o';

    const classes = classnames('sidebar__row', {
      'sidebar__row--dragging': isDragging,
      'sidebar__row--dragging-above': isDraggingOver && dragDirection > 0,
      'sidebar__row--dragging-below': isDraggingOver && dragDirection < 0
    });

    // NOTE: We only want the button draggable, not the whole container (ie. no children)
    const button = connectDragSource(connectDropTarget(
      <button onClick={this._handleCollapse} onContextMenu={this._handleShowActions}>
        <div className="sidebar__clickable">
          <i className={'sidebar__item__icon fa ' + folderIconClass}></i>
          <span>{requestGroup.name}</span>
        </div>
      </button>
    ));

    return (
      <li key={requestGroup._id} className={classes}>
        <div className={classnames(
          'sidebar__item sidebar__item--big', {'sidebar__item--active': isActive}
        )}>
          {button}

          <div className="sidebar__actions">
            <RequestGroupActionsDropdown
              ref={this._setRequestGroupActionsDropdownRef}
              handleCreateRequest={handleCreateRequest}
              handleCreateRequestGroup={handleCreateRequestGroup}
              handleDuplicateRequestGroup={handleDuplicateRequestGroup}
              workspace={workspace}
              requestGroup={requestGroup}
              right
            />
          </div>
        </div>

        <ul className={classnames('sidebar__list', {'sidebar__list--collapsed': isCollapsed})}>
          {children.length > 0 ? children : (
            <SidebarRequestRow
              handleActivateRequest={misc.nullFn}
              handleDuplicateRequest={misc.nullFn}
              handleGenerateCode={misc.nullFn}
              moveDoc={moveDoc}
              isActive={false}
              request={null}
              requestGroup={requestGroup}
              workspace={workspace}
              requestCreate={handleCreateRequest}
            />
          )}
        </ul>
      </li>
    );
  }
}

SidebarRequestGroupRow.propTypes = {
  // Functions
  handleSetRequestGroupCollapsed: PropTypes.func.isRequired,
  handleDuplicateRequestGroup: PropTypes.func.isRequired,
  moveDoc: PropTypes.func.isRequired,
  handleActivateRequest: PropTypes.func.isRequired,
  handleCreateRequest: PropTypes.func.isRequired,
  handleCreateRequestGroup: PropTypes.func.isRequired,

  // Other
  isActive: PropTypes.bool.isRequired,
  isCollapsed: PropTypes.bool.isRequired,
  workspace: PropTypes.object.isRequired,
  requestGroup: PropTypes.object.isRequired,

  // React DnD
  isDragging: PropTypes.bool,
  isDraggingOver: PropTypes.bool,
  connectDragSource: PropTypes.func,
  connectDropTarget: PropTypes.func,

  // Optional
  children: PropTypes.node
};

/**
 * Implements the drag source contract.
 */
const dragSource = {
  beginDrag (props) {
    trackEvent('Folder', 'Drag', 'Begin');
    return {
      requestGroup: props.requestGroup
    };
  }
};

function isAbove (monitor, component) {
  const hoveredNode = ReactDOM.findDOMNode(component);

  const hoveredTop = hoveredNode.getBoundingClientRect().top;
  const draggedTop = monitor.getSourceClientOffset().y;

  return hoveredTop > draggedTop;
}

const dragTarget = {
  drop (props, monitor, component) {
    const movingDoc = monitor.getItem().requestGroup || monitor.getItem().request;
    const parentId = props.requestGroup.parentId;
    const targetId = props.requestGroup._id;

    if (isAbove(monitor, component)) {
      props.moveDoc(movingDoc, parentId, targetId, 1);
    } else {
      props.moveDoc(movingDoc, parentId, targetId, -1);
    }
  },
  hover (props, monitor, component) {
    if (isAbove(monitor, component)) {
      component.decoratedComponentInstance.setDragDirection(1);
    } else {
      component.decoratedComponentInstance.setDragDirection(-1);
    }
  }
};

function sourceCollect (connect, monitor) {
  return {
    connectDragSource: connect.dragSource(),
    isDragging: monitor.isDragging()
  };
}

function targetCollect (connect, monitor) {
  return {
    connectDropTarget: connect.dropTarget(),
    isDraggingOver: monitor.isOver()
  };
}

const source = DragSource('SIDEBAR_REQUEST_ROW', dragSource, sourceCollect)(SidebarRequestGroupRow);
export default DropTarget('SIDEBAR_REQUEST_ROW', dragTarget, targetCollect)(source);