/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { Range } from '../../../../vs/editor/common/core/range';
import { Selection } from '../../../../vs/editor/common/core/selection';
import {
  IViewModel,
  IViewWhitespaceViewportData,
  ViewLineRenderingData,
  ViewModelDecoration,
} from '../../../../vs/editor/common/viewModel/viewModel';
import { IPosition, Position } from '../core/position';

export interface IPartialViewLinesViewportData {
  /**
   * Value to be substracted from `scrollTop` (in order to vertical offset numbers < 1MM)
   */
  readonly bigNumbersDelta: number;
  /**
   * The first (partially) visible line number.
   */
  readonly startLineNumber: number;
  /**
   * The last (partially) visible line number.
   */
  readonly endLineNumber: number;
  /**
   * relativeVerticalOffset[i] is the `top` position for line at `i` + `startLineNumber`.
   */
  readonly relativeVerticalOffset: number[];
  /**
   * The centered line in the viewport.
   */
  readonly centeredLineNumber: number;
  /**
   * The first completely visible line number.
   */
  readonly completelyVisibleStartLineNumber: number;
  /**
   * The last completely visible line number.
   */
  readonly completelyVisibleEndLineNumber: number;
}

/**
 * Contains all data needed to render at a specific viewport.
 */
export class ViewportData {
  public readonly selections: Selection[];

  /**
   * The line number at which to start rendering (inclusive).
   */
  public readonly startLineNumber: number;

  /**
   * The line number at which to end rendering (inclusive).
   */
  public readonly endLineNumber: number;

  /**
   * relativeVerticalOffset[i] is the `top` position for line at `i` + `startLineNumber`.
   */
  public readonly relativeVerticalOffset: number[];

  /**
   * The viewport as a range (startLineNumber,1) -> (endLineNumber,maxColumn(endLineNumber)).
   */
  public readonly visibleRange: Range;

  /**
   * Value to be substracted from `scrollTop` (in order to vertical offset numbers < 1MM)
   */
  public readonly bigNumbersDelta: number;

  /**
   * Positioning information about gaps whitespace.
   */
  public readonly whitespaceViewportData: IViewWhitespaceViewportData[];

  private readonly _model: IViewModel;

  constructor(
    selections: Selection[],
    partialData: IPartialViewLinesViewportData,
    whitespaceViewportData: IViewWhitespaceViewportData[],
    model: IViewModel
  ) {
    this.selections = selections;
    this.startLineNumber = partialData.startLineNumber | 0;
    this.endLineNumber = partialData.endLineNumber | 0;
    this.relativeVerticalOffset = partialData.relativeVerticalOffset;
    this.bigNumbersDelta = partialData.bigNumbersDelta | 0;
    this.whitespaceViewportData = whitespaceViewportData;

    this._model = model;

    this.visibleRange = new Range(
      partialData.startLineNumber,
      this._model.getLineMinColumn(partialData.startLineNumber),
      partialData.endLineNumber,
      this._model.getLineMaxColumn(partialData.endLineNumber)
    );
  }

  public getViewModel() {
    return this._model;
  }

  public getViewLineRenderingData(lineNumber: number): ViewLineRenderingData {
    return this._model.getViewLineRenderingData(this.visibleRange, lineNumber);
  }

  public getDecorationsInViewport(): ViewModelDecoration[] {
    return this._model.getDecorationsInViewport(this.visibleRange);
  }
  public convertViewPositionToModelPosition(
    viewLineNumber: number,
    viewColumn = 1
  ) {
    return this._model.coordinatesConverter.convertViewPositionToModelPosition(
      new Position(viewLineNumber, viewColumn)
    );
  }
  public convertModelPositionToViewPosition(
    modelLineNumber: number,
    modelColumn: number
  ) {
    return this._model.coordinatesConverter.convertModelPositionToViewPosition(
      new Position(modelLineNumber, modelColumn)
    );
  }
}