// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
 * @unrestricted
 */
export default class NetworkOverview extends PerfUI.TimelineOverviewBase {
  constructor() {
    super();
    this._selectedFilmStripTime = -1;
    this.element.classList.add('network-overview');

    /** @type {number} */
    this._numBands = 1;
    /** @type {boolean} */
    this._updateScheduled = false;
    this._highlightedRequest = null;

    SDK.targetManager.addModelListener(
        SDK.ResourceTreeModel, SDK.ResourceTreeModel.Events.Load, this._loadEventFired, this);
    SDK.targetManager.addModelListener(
        SDK.ResourceTreeModel, SDK.ResourceTreeModel.Events.DOMContentLoaded, this._domContentLoadedEventFired, this);

    this.reset();
  }

  setHighlightedRequest(request) {
    this._highlightedRequest = request;
    this.scheduleUpdate();
  }

  /**
   * @param {?SDK.FilmStripModel} filmStripModel
   */
  setFilmStripModel(filmStripModel) {
    this._filmStripModel = filmStripModel;
    this.scheduleUpdate();
  }

  /**
   * @param {number} time
   */
  selectFilmStripFrame(time) {
    this._selectedFilmStripTime = time;
    this.scheduleUpdate();
  }

  clearFilmStripFrame() {
    this._selectedFilmStripTime = -1;
    this.scheduleUpdate();
  }

  /**
   * @param {!Common.Event} event
   */
  _loadEventFired(event) {
    const time = /** @type {number} */ (event.data.loadTime);
    if (time) {
      this._loadEvents.push(time * 1000);
    }
    this.scheduleUpdate();
  }

  /**
   * @param {!Common.Event} event
   */
  _domContentLoadedEventFired(event) {
    const data = /** @type {number} */ (event.data);
    if (data) {
      this._domContentLoadedEvents.push(data * 1000);
    }
    this.scheduleUpdate();
  }

  /**
   * @param {string} connectionId
   * @return {number}
   */
  _bandId(connectionId) {
    if (!connectionId || connectionId === '0') {
      return -1;
    }
    if (this._bandMap.has(connectionId)) {
      return /** @type {number} */ (this._bandMap.get(connectionId));
    }
    const result = this._nextBand++;
    this._bandMap.set(connectionId, result);
    return result;
  }

  /**
   * @param {!SDK.NetworkRequest} request
   */
  updateRequest(request) {
    if (!this._requestsSet.has(request)) {
      this._requestsSet.add(request);
      this._requestsList.push(request);
    }
    this.scheduleUpdate();
  }

  /**
   * @override
   */
  wasShown() {
    this.onResize();
  }

  /**
   * @override
   */
  onResize() {
    const width = this.element.offsetWidth;
    const height = this.element.offsetHeight;
    this.calculator().setDisplayWidth(width);
    this.resetCanvas();
    const numBands = (((height - _padding - 1) / _bandHeight) - 1) | 0;
    this._numBands = (numBands > 0) ? numBands : 1;
    this.scheduleUpdate();
  }

  /**
   * @override
   */
  reset() {
    /** @type {?SDK.FilmStripModel} */
    this._filmStripModel = null;

    /** @type {number} */
    this._span = 1;
    /** @type {?Network.NetworkTimeBoundary} */
    this._lastBoundary = null;
    /** @type {number} */
    this._nextBand = 0;
    /** @type {!Map.<string, number>} */
    this._bandMap = new Map();
    /** @type {!Array.<!SDK.NetworkRequest>} */
    this._requestsList = [];
    /** @type {!Set.<!SDK.NetworkRequest>} */
    this._requestsSet = new Set();
    /** @type {!Array.<number>} */
    this._loadEvents = [];
    /** @type {!Array.<number>} */
    this._domContentLoadedEvents = [];

    // Clear screen.
    this.resetCanvas();
  }

  /**
   * @protected
   */
  scheduleUpdate() {
    if (this._updateScheduled || !this.isShowing()) {
      return;
    }
    this._updateScheduled = true;
    this.element.window().requestAnimationFrame(this.update.bind(this));
  }

  /**
   * @override
   */
  update() {
    this._updateScheduled = false;

    const calculator = this.calculator();

    const newBoundary = new Network.NetworkTimeBoundary(calculator.minimumBoundary(), calculator.maximumBoundary());
    if (!this._lastBoundary || !newBoundary.equals(this._lastBoundary)) {
      const span = calculator.boundarySpan();
      while (this._span < span) {
        this._span *= 1.25;
      }

      calculator.setBounds(calculator.minimumBoundary(), calculator.minimumBoundary() + this._span);
      this._lastBoundary = new Network.NetworkTimeBoundary(calculator.minimumBoundary(), calculator.maximumBoundary());
    }

    const context = this.context();
    const linesByType = {};
    const paddingTop = _padding;

    /**
     * @param {string} type
     */
    function drawLines(type) {
      const lines = linesByType[type];
      if (!lines) {
        return;
      }
      const n = lines.length;
      context.beginPath();
      context.strokeStyle = RequestTimeRangeNameToColor[type];
      for (let i = 0; i < n;) {
        const y = lines[i++] * _bandHeight + paddingTop;
        const startTime = lines[i++];
        let endTime = lines[i++];
        if (endTime === Number.MAX_VALUE) {
          endTime = calculator.maximumBoundary();
        }
        context.moveTo(calculator.computePosition(startTime), y);
        context.lineTo(calculator.computePosition(endTime) + 1, y);
      }
      context.stroke();
    }

    /**
     * @param {string} type
     * @param {number} y
     * @param {number} start
     * @param {number} end
     */
    function addLine(type, y, start, end) {
      let lines = linesByType[type];
      if (!lines) {
        lines = [];
        linesByType[type] = lines;
      }
      lines.push(y, start, end);
    }

    const requests = this._requestsList;
    const n = requests.length;
    for (let i = 0; i < n; ++i) {
      const request = requests[i];
      const band = this._bandId(request.connectionId);
      const y = (band === -1) ? 0 : (band % this._numBands + 1);
      const timeRanges =
          Network.RequestTimingView.calculateRequestTimeRanges(request, this.calculator().minimumBoundary());
      for (let j = 0; j < timeRanges.length; ++j) {
        const type = timeRanges[j].name;
        if (band !== -1 || type === Network.RequestTimeRangeNames.Total) {
          addLine(type, y, timeRanges[j].start * 1000, timeRanges[j].end * 1000);
        }
      }
    }

    context.clearRect(0, 0, this.width(), this.height());
    context.save();
    context.scale(window.devicePixelRatio, window.devicePixelRatio);
    context.lineWidth = 2;
    drawLines(Network.RequestTimeRangeNames.Total);
    drawLines(Network.RequestTimeRangeNames.Blocking);
    drawLines(Network.RequestTimeRangeNames.Connecting);
    drawLines(Network.RequestTimeRangeNames.ServiceWorker);
    drawLines(Network.RequestTimeRangeNames.ServiceWorkerPreparation);
    drawLines(Network.RequestTimeRangeNames.Push);
    drawLines(Network.RequestTimeRangeNames.Proxy);
    drawLines(Network.RequestTimeRangeNames.DNS);
    drawLines(Network.RequestTimeRangeNames.SSL);
    drawLines(Network.RequestTimeRangeNames.Sending);
    drawLines(Network.RequestTimeRangeNames.Waiting);
    drawLines(Network.RequestTimeRangeNames.Receiving);

    if (this._highlightedRequest) {
      const size = 5;
      const borderSize = 2;

      const request = this._highlightedRequest;
      const band = this._bandId(request.connectionId);
      const y = ((band === -1) ? 0 : (band % this._numBands + 1)) * _bandHeight + paddingTop;
      const timeRanges =
          Network.RequestTimingView.calculateRequestTimeRanges(request, this.calculator().minimumBoundary());

      // This is the value of var(--selection-bg-color)
      // to match the selection color used in the performance panel
      context.fillStyle = '#1a73e8';

      const start = timeRanges[0].start * 1000;
      const end = timeRanges[0].end * 1000;
      context.fillRect(
          calculator.computePosition(start) - borderSize, y - size / 2 - borderSize,
          calculator.computePosition(end) - calculator.computePosition(start) + 1 + 2 * borderSize, size * borderSize);

      for (let j = 0; j < timeRanges.length; ++j) {
        const type = timeRanges[j].name;
        if (band !== -1 || type === Network.RequestTimeRangeNames.Total) {
          context.beginPath();
          context.strokeStyle = RequestTimeRangeNameToColor[type];
          context.lineWidth = size;

          const start = timeRanges[j].start * 1000;
          const end = timeRanges[j].end * 1000;
          context.moveTo(calculator.computePosition(start) - 0, y);
          context.lineTo(calculator.computePosition(end) + 1, y);
          context.stroke();
        }
      }
    }

    const height = this.element.offsetHeight;
    context.lineWidth = 1;
    context.beginPath();
    context.strokeStyle = Network.NetworkLogView.getDCLEventColor();
    for (let i = this._domContentLoadedEvents.length - 1; i >= 0; --i) {
      const x = Math.round(calculator.computePosition(this._domContentLoadedEvents[i])) + 0.5;
      context.moveTo(x, 0);
      context.lineTo(x, height);
    }
    context.stroke();

    context.beginPath();
    context.strokeStyle = Network.NetworkLogView.getLoadEventColor();
    for (let i = this._loadEvents.length - 1; i >= 0; --i) {
      const x = Math.round(calculator.computePosition(this._loadEvents[i])) + 0.5;
      context.moveTo(x, 0);
      context.lineTo(x, height);
    }
    context.stroke();

    if (this._selectedFilmStripTime !== -1) {
      context.lineWidth = 2;
      context.beginPath();
      context.strokeStyle = '#FCCC49';  // Keep in sync with .network-frame-divider CSS rule.
      const x = Math.round(calculator.computePosition(this._selectedFilmStripTime));
      context.moveTo(x, 0);
      context.lineTo(x, height);
      context.stroke();
    }
    context.restore();
  }
}

export const RequestTimeRangeNameToColor = {
  [Network.RequestTimeRangeNames.Total]: '#CCCCCC',
  [Network.RequestTimeRangeNames.Blocking]: '#AAAAAA',
  [Network.RequestTimeRangeNames.Connecting]: '#FF9800',
  [Network.RequestTimeRangeNames.ServiceWorker]: '#FF9800',
  [Network.RequestTimeRangeNames.ServiceWorkerPreparation]: '#FF9800',
  [Network.RequestTimeRangeNames.Push]: '#8CDBff',
  [Network.RequestTimeRangeNames.Proxy]: '#A1887F',
  [Network.RequestTimeRangeNames.DNS]: '#009688',
  [Network.RequestTimeRangeNames.SSL]: '#9C27B0',
  [Network.RequestTimeRangeNames.Sending]: '#B0BEC5',
  [Network.RequestTimeRangeNames.Waiting]: '#00C853',
  [Network.RequestTimeRangeNames.Receiving]: '#03A9F4',
};

/** @type {number} */
export const _bandHeight = 3;

/** @type {number} */
export const _padding = 5;

/* Legacy exported object */
self.Network = self.Network || {};

/* Legacy exported object */
Network = Network || {};

/**
 * @constructor
 */
Network.NetworkOverview = NetworkOverview;

/** @typedef {{start: number, end: number}} */
Network.NetworkOverview.Window;

Network.NetworkOverview.RequestTimeRangeNameToColor = RequestTimeRangeNameToColor;

/** @type {number} */
Network.NetworkOverview._bandHeight = _bandHeight;

/** @type {number} */
Network.NetworkOverview._padding = _padding;