// Copyright (C) 2018 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * A plain js object, holding objects of type |Class| keyed by string id.
 * We use this instead of using |Map| object since it is simpler and faster to
 * serialize for use in postMessage.
 */
export interface ObjectById<Class extends{id: string}> { [id: string]: Class; }

export interface TrackState {
  id: string;
  engineId: string;
  maxDepth: number;
  kind: string;
  name: string;
  // TODO: These need to be nested into track kind spesific state.
  // cpu slice state:
  cpu: number;
  // chrome slice state:
  upid?: number;
  utid?: number;
  dataReq?: TrackDataRequest;
}

export interface TrackDataRequest {
  start: number;
  end: number;
  resolution: number;
}

export interface EngineConfig {
  id: string;
  ready: boolean;
  source: string|File;
}

export interface QueryConfig {
  id: string;
  engineId: string;
  query: string;
}

export interface PermalinkConfig {
  requestId?: string;  // Set by the frontend to request a new permalink.
  hash?: string;       // Set by the controller when the link has been created.
}

export interface TraceTime {
  startSec: number;
  endSec: number;
  lastUpdate: number;  // Epoch in seconds (Date.now() / 1000).
}

export interface Status {
  msg: string;
  timestamp: number;  // Epoch in seconds (Date.now() / 1000).
}

export interface State {
  route: string|null;
  nextId: number;

  /**
   * Open traces.
   */
  engines: ObjectById<EngineConfig>;
  traceTime: TraceTime;
  visibleTraceTime: TraceTime;
  tracks: ObjectById<TrackState>;
  scrollingTracks: string[];
  pinnedTracks: string[];
  queries: ObjectById<QueryConfig>;
  permalink: PermalinkConfig;
  status: Status;
}

export function createEmptyState(): State {
  return {
    route: null,
    nextId: 0,
    engines: {},
    traceTime: {startSec: 0, endSec: 10, lastUpdate: 0},
    visibleTraceTime: {startSec: 0, endSec: 10, lastUpdate: 0},
    tracks: {},
    pinnedTracks: [],
    scrollingTracks: [],
    queries: {},
    permalink: {},
    status: {msg: '', timestamp: 0},
  };
}