import {Timespan, TimespanModel} from './timespan.factory'
import {Gantt} from '../gantt.factory'

export class GanttTimespansManager {
  static GanttTimespan: { new(gantt: Gantt, model: TimespanModel): Timespan }

  private gantt: Gantt
  private timespansMap: {} = {}
  private timespans: Timespan[] = []

  constructor (gantt) {
    this.gantt = gantt

    this.gantt.$scope.$watchCollection('timespans', (newValue: TimespanModel[]) => {
      this.clearTimespans()
      this.loadTimespans(newValue)
    })

    this.gantt.api.registerMethod('timespans', 'load', this.loadTimespans, this)
    this.gantt.api.registerMethod('timespans', 'remove', this.removeTimespans, this)
    this.gantt.api.registerMethod('timespans', 'clear', this.clearTimespans, this)

    this.gantt.api.registerEvent('timespans', 'add')
    this.gantt.api.registerEvent('timespans', 'remove')
    this.gantt.api.registerEvent('timespans', 'change')
  }

  /**
   * Adds or updates timespans
   * @param timespans
   */
  loadTimespans (timespans: TimespanModel | TimespanModel[]) {
    if (!Array.isArray(timespans)) {
      timespans = timespans !== undefined ? [timespans] : []
    }

    this.gantt.$scope.timespans = timespans
    // tslint:disable:one-variable-per-declaration
    for (let i = 0, l = timespans.length; i < l; i++) {
      let timespanModel = timespans[i]
      this.gantt.objectModel.cleanTimespan(timespanModel)
      this.loadTimespan(timespanModel)
    }
  }

  /**
   * Adds a timespan or merges the timespan if there is already one with the same id
   * @param timespanModel
   * @returns {boolean}
   */
  loadTimespan (timespanModel: TimespanModel) {
    // Copy to new timespan (add) or merge with existing (update)
    let timespan: Timespan
    let isUpdate = false

    if (timespanModel.id in this.timespansMap) {
      timespan = this.timespansMap[timespanModel.id]
      timespan.model = timespanModel
      isUpdate = true;
      (this.gantt.api as any).timespans.raise.change(timespan)
    } else {
      timespan = new GanttTimespansManager.GanttTimespan(this.gantt, timespanModel)
      this.timespansMap[timespanModel.id] = timespan
      this.timespans.push(timespan);
      (this.gantt.api as any).timespans.raise.add(timespan)
    }

    timespan.updatePosAndSize()
    return isUpdate
  }

  removeTimespans (timespans: TimespanModel | TimespanModel[]) {
    if (!Array.isArray(timespans)) {
      timespans = [timespans]
    }

    for (let i = 0, l = timespans.length; i < l; i++) {
      let timespanData = timespans[i]
      this.removeTimespan(timespanData.id)
    }
  }

  removeTimespan (timespanId: string) {
    if (timespanId in this.timespansMap) {
      delete this.timespansMap[timespanId] // Remove from map

      let removedTimespan
      let timespan
      for (let i = this.timespans.length - 1; i >= 0; i--) {
        timespan = this.timespans[i]
        if (timespan.model.id === timespanId) {
          removedTimespan = timespan
          this.timespans.splice(i, 1) // Remove from array
          break
        }
      }

      (this.gantt.api as any).timespans.raise.remove(removedTimespan)
      return removedTimespan
    }

    return undefined
  }

  /**
   * Removes all timespans
   */
  clearTimespans () {
    this.timespansMap = {}
    this.timespans = []
  }

  updateTimespansPosAndSize () {
    for (let i = 0, l = this.timespans.length; i < l; i++) {
      this.timespans[i].updatePosAndSize()
    }
  }
}

export default function (GanttTimespan: { new(gantt: Gantt, model: TimespanModel): Timespan }) {
  'ngInject'

  GanttTimespansManager.GanttTimespan = GanttTimespan
  return GanttTimespansManager
}