/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {Platform} from '@angular/cdk/platform';
import {ViewportRuler} from '@angular/cdk/scrolling';
import {DOCUMENT} from '@angular/common';
import {ElementRef, Inject, Injectable} from '@angular/core';

import {OverlayContainer} from '../overlay-container';

import {OriginConnectionPosition, OverlayConnectionPosition} from './connected-position';
import {ConnectedPositionStrategy} from './connected-position-strategy';
import {
  FlexibleConnectedPositionStrategy,
  FlexibleConnectedPositionStrategyOrigin,
} from './flexible-connected-position-strategy';
import {GlobalPositionStrategy} from './global-position-strategy';


/** Builder for overlay position strategy. */
@Injectable({providedIn: 'root'})
export class OverlayPositionBuilder {
  constructor(
      private _viewportRuler: ViewportRuler, @Inject(DOCUMENT) private _document: any,
      private _platform: Platform, private _overlayContainer: OverlayContainer) {}

  /**
   * Creates a global position strategy.
   */
  global(): GlobalPositionStrategy {
    return new GlobalPositionStrategy();
  }

  /**
   * Creates a relative position strategy.
   * @param elementRef
   * @param originPos
   * @param overlayPos
   * @deprecated Use `flexibleConnectedTo` instead.
   * @breaking-change 8.0.0
   */
  connectedTo(
      elementRef: ElementRef,
      originPos: OriginConnectionPosition,
      overlayPos: OverlayConnectionPosition): ConnectedPositionStrategy {
    return new ConnectedPositionStrategy(
        originPos, overlayPos, elementRef, this._viewportRuler, this._document, this._platform,
        this._overlayContainer);
  }

  /**
   * Creates a flexible position strategy.
   * @param origin Origin relative to which to position the overlay.
   */
  flexibleConnectedTo(origin: FlexibleConnectedPositionStrategyOrigin):
    FlexibleConnectedPositionStrategy {
    return new FlexibleConnectedPositionStrategy(origin, this._viewportRuler, this._document,
        this._platform, this._overlayContainer);
  }

}