// -- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2013 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See doc/COPYRIGHT.rdoc for more details.
// ++

import {Moment} from 'moment';
import {openprojectModule} from '../../../../angular-modules';
import {scopeDestroyed$} from '../../../../helpers/angular-rx-utils';
import {debugLog, timeOutput} from '../../../../helpers/debug_output';
import {TypeResource} from '../../../api/api-v3/hal-resources/type-resource.service';
import {WorkPackageResourceInterface} from '../../../api/api-v3/hal-resources/work-package-resource.service';
import {States} from '../../../states.service';
import {WorkPackageNotificationService} from '../../../wp-edit/wp-notification.service';
import {RenderedRow} from '../../../wp-fast-table/builders/primary-render-pass';
import {WorkPackageTableHierarchiesService} from '../../../wp-fast-table/state/wp-table-hierarchy.service';
import {WorkPackageTableTimelineService} from '../../../wp-fast-table/state/wp-table-timeline.service';
import {WorkPackageTable} from '../../../wp-fast-table/wp-fast-table';
import {WorkPackageTableTimelineState} from '../../../wp-fast-table/wp-table-timeline';
import {WorkPackageRelationsService} from '../../../wp-relations/wp-relations.service';

import {selectorTimelineSide} from '../../wp-table-scroll-sync';
import {WorkPackagesTableController} from '../../wp-table.directive';
import {WorkPackageTimelineCell} from '../cells/wp-timeline-cell';
import {WorkPackageTimelineCellsRenderer} from '../cells/wp-timeline-cells-renderer';
import {
  calculateDaySpan,
  getPixelPerDayForZoomLevel,
  timelineElementCssClass,
  timelineLeftSpacingInDays,
  timelineMarkerSelectionStartClass,
  TimelineViewParameters,
  zoomLevelOrder
} from '../wp-timeline';
import moment = require('moment');


export class WorkPackageTimelineTableController {

  public wpTableDirective:WorkPackagesTableController;

  public workPackageTable:WorkPackageTable;

  private _viewParameters:TimelineViewParameters = new TimelineViewParameters();

  public disableViewParamsCalculation = false;

  public workPackageIdOrder:RenderedRow[] = [];

  private renderers:{ [name:string]:(vp:TimelineViewParameters) => void } = {};

  private cellsRenderer = new WorkPackageTimelineCellsRenderer(this);

  public outerContainer:JQuery;

  public timelineBody:JQuery;

  private selectionParams = {
    notification: null
  };

  private text:{ selectionMode:string };

  private debouncedRefresh:() => any;

  constructor(private $scope:angular.IScope,
              private $element:angular.IAugmentedJQuery,
              private states:States,
              private NotificationsService:any,
              private wpTableTimeline:WorkPackageTableTimelineService,
              private wpNotificationsService:WorkPackageNotificationService,
              private wpRelations:WorkPackageRelationsService,
              private wpTableHierarchies:WorkPackageTableHierarchiesService,
              private I18n:op.I18n) {
    'ngInject';
  }

  $onInit() {
    this.text = {
      selectionMode: this.I18n.t('js.timelines.selection_mode.notification')
    };

    // Get the outer container for width computation
    this.outerContainer = this.$element.find('.wp-table-timeline--outer');
    this.timelineBody = this.$element.find('.wp-table-timeline--body');

    // Debounced refresh function
    this.debouncedRefresh = _.debounce(
      () => {
        debugLog('Refreshing view in debounce.');
        this.refreshView();
      },
      500,
      {leading: true}
    );

    // Register this instance to the table
    this.wpTableDirective.registerTimeline(this, this.timelineBody[0]);

    // Refresh on changes to work packages
    this.updateOnWorkPackageChanges();

    // Refresh timeline view after table rendered
    this.states.table.rendered.values$()
      .takeUntil(this.states.table.stopAllSubscriptions)
      .filter(() => this.initialized)
      .subscribe((orderedRows) => {
        // Remember all visible rows in their order of appearance.
        this.workPackageIdOrder = orderedRows.filter(row => !row.hidden);
        this.refreshView();
      });

    this.states.table.timelineAutoZoom.values$()
      .takeUntil(this.states.table.stopAllSubscriptions)
      .filter(() => this.initialized)
      .filter((enabled:boolean) => enabled)
      .subscribe(() => {
        this.refreshView();
      });

    // Refresh timeline view when becoming visible
    this.states.table.timelineVisible.values$()
      .filter((timelineState:WorkPackageTableTimelineState) => timelineState.isVisible)
      .takeUntil(scopeDestroyed$(this.$scope))
      .subscribe((timelineState:WorkPackageTableTimelineState) => {
        this.viewParameters.settings.zoomLevel = timelineState.zoomLevel;
        this.debouncedRefresh();
      });

    // Load the types whenever the timeline is first visible
    // TODO: Load only necessary types from API
    this.states.table.timelineVisible.values$()
      .filter((timelineState) => timelineState.isVisible)
      .take(1)
      .subscribe(() => {
        TypeResource.loadAll().then(() => {
          this.debouncedRefresh();
        });
      });
  }

  workPackageInView(wpId:string):boolean {
    return this.cellsRenderer.hasCell(wpId);
  }

  workPackageCells(wpId:string):WorkPackageTimelineCell[] {
    return this.cellsRenderer.getCellsFor(wpId);
  }

  /**
   * Return the index of a given row by its class identifier
   */
  workPackageIndex(classIdentifier:string):number {
    return this.workPackageIdOrder.findIndex((el) => el.classIdentifier === classIdentifier);
  }

  onRefreshRequested(name:string, callback:(vp:TimelineViewParameters) => void) {
    this.renderers[name] = callback;
  }

  getAbsoluteLeftCoordinates():number {
    return this.$element.offset().left;
  }

  getParentScrollContainer() {
    return this.outerContainer.closest(selectorTimelineSide)[0];
  }

  get viewParameters():TimelineViewParameters {
    return this._viewParameters;
  }

  get inHierarchyMode():boolean {
    return this.wpTableHierarchies.isEnabled;
  }

  get initialized():boolean {
    return this.workPackageTable && this.states.table.rendered.hasValue();
  }

  refreshView() {
    if (!this.wpTableTimeline.isVisible) {
      debugLog('refreshView() requested, but TL is invisible.');
      return;
    }

    timeOutput('refreshView() in timeline container', () => {
      // Reset the width of the outer container if its content shrinks
      this.outerContainer.css('width', 'auto');

      if (this.states.table.timelineAutoZoom.value!) {
        this.applyAutoZoomLevel();
      }

      this.calculateViewParams(this._viewParameters);

      // Update all cells
      this.cellsRenderer.refreshAllCells();

      _.each(this.renderers, (cb, key) => {
        debugLog(`Refreshing timeline member ${key}`);
        cb(this._viewParameters);
      });

      // Calculate overflowing width to set to outer container
      // required to match width in all child divs
      const currentWidth = this.getParentScrollContainer().scrollWidth;
      this.outerContainer.width(currentWidth);
    });
  }

  updateOnWorkPackageChanges() {
    this.states.workPackages.observeChange()
      .withLatestFrom(this.states.table.timelineVisible.values$())
      .takeUntil(scopeDestroyed$(this.$scope))
      .filter(([, timelineState]) => this.initialized && timelineState.isVisible)
      .map(([[wpId]]) => wpId)
      .filter((wpId) => this.cellsRenderer.hasCell(wpId))
      .subscribe((wpId) => {
        const viewParamsChanged = this.calculateViewParams(this._viewParameters);
        if (viewParamsChanged) {
          this.debouncedRefresh();
        } else {
          // Refresh the single cell
          this.cellsRenderer.refreshCellsFor(wpId);
        }
      });
  }

  startAddRelationPredecessor(start:WorkPackageResourceInterface) {
    this.activateSelectionMode(start.id, end => {
      this.wpRelations
        .addCommonRelation(start as any, 'follows', end.id)
        .catch((error:any) => this.wpNotificationsService.handleErrorResponse(error, end));
    });
  }

  startAddRelationFollower(start:WorkPackageResourceInterface) {
    this.activateSelectionMode(start.id, end => {
      this.wpRelations
        .addCommonRelation(start as any, 'precedes', end.id)
        .catch((error:any) => this.wpNotificationsService.handleErrorResponse(error, end));
    });
  }

  getFirstDayInViewport() {
    const outerContainer = this.getParentScrollContainer();
    const scrollLeft = outerContainer.scrollLeft;
    const nonVisibleDaysLeft = Math.floor(scrollLeft / this.viewParameters.pixelPerDay);
    return this.viewParameters.dateDisplayStart.clone().add(nonVisibleDaysLeft, 'days');
  }

  getLastDayInViewport() {
    const outerContainer = this.getParentScrollContainer();
    const scrollLeft = outerContainer.scrollLeft;
    const width = outerContainer.offsetWidth;
    const viewPortRight = scrollLeft + width;
    const daysUntilViewPortEnds = Math.ceil(viewPortRight / this.viewParameters.pixelPerDay) + 1;
    return this.viewParameters.dateDisplayStart.clone().add(daysUntilViewPortEnds, 'days');
  }

  forceCursor(cursor:string) {
    jQuery('.' + timelineElementCssClass).css('cursor', cursor);
    jQuery('.wp-timeline-cell').css('cursor', cursor);
    jQuery('.hascontextmenu').css('cursor', cursor);
    jQuery('.leftHandle').css('cursor', cursor);
    jQuery('.rightHandle').css('cursor', cursor);
  }

  resetCursor() {
    jQuery('.' + timelineElementCssClass).css('cursor', '');
    jQuery('.wp-timeline-cell').css('cursor', '');
    jQuery('.hascontextmenu').css('cursor', '');
    jQuery('.leftHandle').css('cursor', '');
    jQuery('.rightHandle').css('cursor', '');
  }

  private resetSelectionMode() {
    this._viewParameters.activeSelectionMode = null;
    this._viewParameters.selectionModeStart = null;

    this.NotificationsService.remove(this.selectionParams.notification);

    Mousetrap.unbind('esc');

    this.$element.removeClass('active-selection-mode');
    jQuery('.' + timelineMarkerSelectionStartClass).removeClass(timelineMarkerSelectionStartClass);
    this.refreshView();
  }

  private activateSelectionMode(start:string, callback:(wp:WorkPackageResourceInterface) => any) {
    start = start.toString(); // old system bug: ID can be a 'number'

    this._viewParameters.activeSelectionMode = (wp:WorkPackageResourceInterface) => {
      callback(wp);
      this.resetSelectionMode();
    };

    this._viewParameters.selectionModeStart = start;
    Mousetrap.bind('esc', () => this.resetSelectionMode());
    this.selectionParams.notification = this.NotificationsService.addNotice(this.text.selectionMode);

    this.$element.addClass('active-selection-mode');
    this.refreshView();
  }

  private calculateViewParams(currentParams:TimelineViewParameters):boolean {
    if (this.disableViewParamsCalculation) {
      return false;
    }

    const newParams = new TimelineViewParameters();
    let changed = false;

    // Calculate view parameters
    this.workPackageIdOrder.forEach((renderedRow) => {
      const wpId = renderedRow.workPackageId;

      // Not all rendered rows are work packages
      if (!wpId || this.states.workPackages.get(wpId).isPristine()) {
        return;
      }

      // We may still have a reference to a row that, e.g., just got deleted
      const workPackage = this.states.workPackages.get(wpId).value!;
      const startDate = workPackage.startDate ? moment(workPackage.startDate) : currentParams.now;
      const dueDate = workPackage.dueDate ? moment(workPackage.dueDate) : currentParams.now;
      const date = workPackage.date ? moment(workPackage.date) : currentParams.now;

      // start date
      newParams.dateDisplayStart = moment.min(
        newParams.dateDisplayStart,
        currentParams.now,
        startDate,
        date);

      // due date
      newParams.dateDisplayEnd = moment.max(
        newParams.dateDisplayEnd,
        currentParams.now,
        dueDate,
        date);
    });

    // left spacing
    newParams.dateDisplayStart.subtract(timelineLeftSpacingInDays, 'days');

    // right spacing
    const width = this.$element.width();
    const pixelPerDay = currentParams.pixelPerDay;
    const visibleDays = Math.ceil((width / pixelPerDay) * 1.5);
    newParams.dateDisplayEnd.add(visibleDays, 'days');

    // Check if view params changed:

    // start date
    if (!newParams.dateDisplayStart.isSame(this._viewParameters.dateDisplayStart)) {
      changed = true;
      this._viewParameters.dateDisplayStart = newParams.dateDisplayStart;
    }

    // end date
    if (!newParams.dateDisplayEnd.isSame(this._viewParameters.dateDisplayEnd)) {
      changed = true;
      this._viewParameters.dateDisplayEnd = newParams.dateDisplayEnd;
    }

    // Calculate the visible viewport
    const firstDayInViewport = this.getFirstDayInViewport();
    const lastDayInViewport = this.getLastDayInViewport();
    const viewport:[Moment, Moment] = [firstDayInViewport, lastDayInViewport];
    this._viewParameters.visibleViewportAtCalculationTime = viewport;

    return changed;
  }

  private applyAutoZoomLevel() {
    const daysSpan = calculateDaySpan(this.workPackageIdOrder, this.states.workPackages);
    const timelineWidthInPx = this.outerContainer.width();

    for (let zoomLevel of zoomLevelOrder) {
      const pixelPerDay = getPixelPerDayForZoomLevel(zoomLevel);
      const visibleDays = timelineWidthInPx / pixelPerDay;

      if (visibleDays >= daysSpan || zoomLevel === _.last(zoomLevelOrder)) {
        // Zoom level is enough
        const previousZoomLevel = this._viewParameters.settings.zoomLevel;

        // did the zoom level changed?
        if (previousZoomLevel !== zoomLevel) {
          this.wpTableTimeline.setZoomLevel(zoomLevel);
          this.wpTableDirective.timeline.scrollLeft = 0;
        }
        return;
      }
    }
  }

}

openprojectModule.component('wpTimelineContainer', {
  controller: WorkPackageTimelineTableController,
  templateUrl: '/components/wp-table/timeline/container/wp-timeline-container.html',
  require: {
    wpTableDirective: '^wpTable'
  }
});