// 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.

import {assertExists} from '../base/logging';
import {Actions, DeferredAction} from '../common/actions';
import {AggregateData} from '../common/aggregation_data';
import {Args, ArgsTree} from '../common/arg_types';
import {
  ConversionJobName,
  ConversionJobStatus,
} from '../common/conversion_jobs';
import {createEmptyState} from '../common/empty_state';
import {Engine} from '../common/engine';
import {MetricResult} from '../common/metric_data';
import {CurrentSearchResults, SearchSummary} from '../common/search_data';
import {CallsiteInfo, EngineConfig, ProfileType, State} from '../common/state';
import {fromNs, toNs} from '../common/time';

import {Analytics, initAnalytics} from './analytics';
import {BottomTabList} from './bottom_tab';
import {FrontendLocalState} from './frontend_local_state';
import {RafScheduler} from './raf_scheduler';
import {Router} from './router';
import {ServiceWorkerController} from './service_worker_controller';

type Dispatch = (action: DeferredAction) => void;
type TrackDataStore = Map<string, {}>;
type QueryResultsStore = Map<string, {}|undefined>;
type AggregateDataStore = Map<string, AggregateData>;
type Description = Map<string, string>;

export interface SliceDetails {
  ts?: number;
  absTime?: string;
  dur?: number;
  threadTs?: number;
  threadDur?: number;
  priority?: number;
  endState?: string|null;
  cpu?: number;
  id?: number;
  threadStateId?: number;
  utid?: number;
  wakeupTs?: number;
  wakerUtid?: number;
  wakerCpu?: number;
  category?: string;
  name?: string;
  tid?: number;
  threadName?: string;
  pid?: number;
  processName?: string;
  uid?: number;
  packageName?: string;
  versionCode?: number;
  args?: Args;
  argsTree?: ArgsTree;
  description?: Description;
}

export interface FlowPoint {
  trackId: number;

  sliceName: string;
  sliceCategory: string;
  sliceId: number;
  sliceStartTs: number;
  sliceEndTs: number;
  // Thread and process info. Only set in sliceSelected not in areaSelected as
  // the latter doesn't display per-flow info and it'd be a waste to join
  // additional tables for undisplayed info in that case. Nothing precludes
  // adding this in a future iteration however.
  threadName: string;
  processName: string;

  depth: number;

  // TODO(altimin): Ideally we should have a generic mechanism for allowing to
  // customise the name here, but for now we are hardcording a few
  // Chrome-specific bits in the query here.
  sliceChromeCustomName?: string;
}

export interface Flow {
  id: number;

  begin: FlowPoint;
  end: FlowPoint;
  dur: number;

  category?: string;
  name?: string;
}

export interface CounterDetails {
  startTime?: number;
  value?: number;
  delta?: number;
  duration?: number;
  name?: string;
}

export interface ThreadStateDetails {
  ts?: number;
  dur?: number;
}

export interface FlamegraphDetails {
  type?: ProfileType;
  id?: number;
  startNs?: number;
  durNs?: number;
  pids?: number[];
  upids?: number[];
  flamegraph?: CallsiteInfo[];
  expandedCallsite?: CallsiteInfo;
  viewingOption?: string;
  expandedId?: number;
  // isInAreaSelection is true if a flamegraph is part of the current area
  // selection.
  isInAreaSelection?: boolean;
  // When heap_graph_non_finalized_graph has a count >0, we mark the graph
  // as incomplete.
  graphIncomplete?: boolean;
}

export interface CpuProfileDetails {
  id?: number;
  ts?: number;
  utid?: number;
  stack?: CallsiteInfo[];
}

export interface QuantizedLoad {
  startSec: number;
  endSec: number;
  load: number;
}
type OverviewStore = Map<string, QuantizedLoad[]>;

export interface ThreadDesc {
  utid: number;
  tid: number;
  threadName: string;
  pid?: number;
  procName?: string;
  cmdline?: string;
}
type ThreadMap = Map<number, ThreadDesc>;

export interface FtraceEvent {
  id: number;
  ts: number;
  name: string;
  cpu: number;
  thread: string|null;
  process: string|null;
  args: string;
}

export interface FtracePanelData {
  events: FtraceEvent[];
  offset: number;
  numEvents: number;  // Number of events in the visible window
}

export interface FtraceStat {
  name: string;
  count: number;
}

function getRoot() {
  // Works out the root directory where the content should be served from
  // e.g. `http://origin/v1.2.3/`.
  const script = document.currentScript as HTMLScriptElement;

  // Needed for DOM tests, that do not have script element.
  if (script === null) {
    return '';
  }

  let root = script.src;
  root = root.substr(0, root.lastIndexOf('/') + 1);
  return root;
}

/**
 * Global accessors for state/dispatch in the frontend.
 */
class Globals {
  readonly root = getRoot();

  bottomTabList?: BottomTabList = undefined;

  private _testing = false;
  private _dispatch?: Dispatch = undefined;
  private _state?: State = undefined;
  private _frontendLocalState?: FrontendLocalState = undefined;
  private _rafScheduler?: RafScheduler = undefined;
  private _serviceWorkerController?: ServiceWorkerController = undefined;
  private _logging?: Analytics = undefined;
  private _isInternalUser: boolean|undefined = undefined;

  // TODO(hjd): Unify trackDataStore, queryResults, overviewStore, threads.
  private _trackDataStore?: TrackDataStore = undefined;
  private _queryResults?: QueryResultsStore = undefined;
  private _overviewStore?: OverviewStore = undefined;
  private _aggregateDataStore?: AggregateDataStore = undefined;
  private _threadMap?: ThreadMap = undefined;
  private _sliceDetails?: SliceDetails = undefined;
  private _threadStateDetails?: ThreadStateDetails = undefined;
  private _connectedFlows?: Flow[] = undefined;
  private _selectedFlows?: Flow[] = undefined;
  private _visibleFlowCategories?: Map<string, boolean> = undefined;
  private _counterDetails?: CounterDetails = undefined;
  private _flamegraphDetails?: FlamegraphDetails = undefined;
  private _cpuProfileDetails?: CpuProfileDetails = undefined;
  private _numQueriesQueued = 0;
  private _bufferUsage?: number = undefined;
  private _recordingLog?: string = undefined;
  private _traceErrors?: number = undefined;
  private _metricError?: string = undefined;
  private _metricResult?: MetricResult = undefined;
  private _jobStatus?: Map<ConversionJobName, ConversionJobStatus> = undefined;
  private _router?: Router = undefined;
  private _embeddedMode?: boolean = undefined;
  private _hideSidebar?: boolean = undefined;
  private _ftraceCounters?: FtraceStat[] = undefined;
  private _ftracePanelData?: FtracePanelData = undefined;

  // TODO(hjd): Remove once we no longer need to update UUID on redraw.
  private _publishRedraw?: () => void = undefined;

  private _currentSearchResults: CurrentSearchResults = {
    sliceIds: new Float64Array(0),
    tsStarts: new Float64Array(0),
    utids: new Float64Array(0),
    trackIds: [],
    sources: [],
    totalResults: 0,
  };
  searchSummary: SearchSummary = {
    tsStarts: new Float64Array(0),
    tsEnds: new Float64Array(0),
    count: new Uint8Array(0),
  };

  engines = new Map<string, Engine>();

  initialize(dispatch: Dispatch, router: Router) {
    this._dispatch = dispatch;
    this._router = router;
    this._state = createEmptyState();
    this._frontendLocalState = new FrontendLocalState();
    this._rafScheduler = new RafScheduler();
    this._serviceWorkerController = new ServiceWorkerController();
    this._testing =
        self.location && self.location.search.indexOf('testing=1') >= 0;
    this._logging = initAnalytics();

    // TODO(hjd): Unify trackDataStore, queryResults, overviewStore, threads.
    this._trackDataStore = new Map<string, {}>();
    this._queryResults = new Map<string, {}>();
    this._overviewStore = new Map<string, QuantizedLoad[]>();
    this._aggregateDataStore = new Map<string, AggregateData>();
    this._threadMap = new Map<number, ThreadDesc>();
    this._sliceDetails = {};
    this._connectedFlows = [];
    this._selectedFlows = [];
    this._visibleFlowCategories = new Map<string, boolean>();
    this._counterDetails = {};
    this._threadStateDetails = {};
    this._flamegraphDetails = {};
    this._cpuProfileDetails = {};
    this.engines.clear();
  }

  get router(): Router {
    return assertExists(this._router);
  }

  get publishRedraw(): () => void {
    return this._publishRedraw || (() => {});
  }

  set publishRedraw(f: () => void) {
    this._publishRedraw = f;
  }

  get state(): State {
    return assertExists(this._state);
  }

  set state(state: State) {
    this._state = assertExists(state);
  }

  get dispatch(): Dispatch {
    return assertExists(this._dispatch);
  }

  dispatchMultiple(actions: DeferredAction[]): void {
    const dispatch = this.dispatch;
    for (const action of actions) {
      dispatch(action);
    }
  }

  get frontendLocalState() {
    return assertExists(this._frontendLocalState);
  }

  get rafScheduler() {
    return assertExists(this._rafScheduler);
  }

  get logging() {
    return assertExists(this._logging);
  }

  get serviceWorkerController() {
    return assertExists(this._serviceWorkerController);
  }

  // TODO(hjd): Unify trackDataStore, queryResults, overviewStore, threads.
  get overviewStore(): OverviewStore {
    return assertExists(this._overviewStore);
  }

  get trackDataStore(): TrackDataStore {
    return assertExists(this._trackDataStore);
  }

  get queryResults(): QueryResultsStore {
    return assertExists(this._queryResults);
  }

  get threads() {
    return assertExists(this._threadMap);
  }

  get sliceDetails() {
    return assertExists(this._sliceDetails);
  }

  set sliceDetails(click: SliceDetails) {
    this._sliceDetails = assertExists(click);
  }

  get threadStateDetails() {
    return assertExists(this._threadStateDetails);
  }

  set threadStateDetails(click: ThreadStateDetails) {
    this._threadStateDetails = assertExists(click);
  }

  get connectedFlows() {
    return assertExists(this._connectedFlows);
  }

  set connectedFlows(connectedFlows: Flow[]) {
    this._connectedFlows = assertExists(connectedFlows);
  }

  get selectedFlows() {
    return assertExists(this._selectedFlows);
  }

  set selectedFlows(selectedFlows: Flow[]) {
    this._selectedFlows = assertExists(selectedFlows);
  }

  get visibleFlowCategories() {
    return assertExists(this._visibleFlowCategories);
  }

  set visibleFlowCategories(visibleFlowCategories: Map<string, boolean>) {
    this._visibleFlowCategories = assertExists(visibleFlowCategories);
  }

  get counterDetails() {
    return assertExists(this._counterDetails);
  }

  set counterDetails(click: CounterDetails) {
    this._counterDetails = assertExists(click);
  }

  get aggregateDataStore(): AggregateDataStore {
    return assertExists(this._aggregateDataStore);
  }

  get flamegraphDetails() {
    return assertExists(this._flamegraphDetails);
  }

  set flamegraphDetails(click: FlamegraphDetails) {
    this._flamegraphDetails = assertExists(click);
  }

  get traceErrors() {
    return this._traceErrors;
  }

  setTraceErrors(arg: number) {
    this._traceErrors = arg;
  }

  get metricError() {
    return this._metricError;
  }

  setMetricError(arg: string) {
    this._metricError = arg;
  }

  get metricResult() {
    return this._metricResult;
  }

  setMetricResult(result: MetricResult) {
    this._metricResult = result;
  }

  get cpuProfileDetails() {
    return assertExists(this._cpuProfileDetails);
  }

  set cpuProfileDetails(click: CpuProfileDetails) {
    this._cpuProfileDetails = assertExists(click);
  }

  set numQueuedQueries(value: number) {
    this._numQueriesQueued = value;
  }

  get numQueuedQueries() {
    return this._numQueriesQueued;
  }

  get bufferUsage() {
    return this._bufferUsage;
  }

  get recordingLog() {
    return this._recordingLog;
  }

  get currentSearchResults() {
    return this._currentSearchResults;
  }

  set currentSearchResults(results: CurrentSearchResults) {
    this._currentSearchResults = results;
  }

  get hasFtrace(): boolean {
    return Boolean(this._ftraceCounters && this._ftraceCounters.length > 0);
  }

  get ftraceCounters(): FtraceStat[]|undefined {
    return this._ftraceCounters;
  }

  set ftraceCounters(value: FtraceStat[]|undefined) {
    this._ftraceCounters = value;
  }

  getConversionJobStatus(name: ConversionJobName): ConversionJobStatus {
    return this.getJobStatusMap().get(name) || ConversionJobStatus.NotRunning;
  }

  setConversionJobStatus(name: ConversionJobName, status: ConversionJobStatus) {
    const map = this.getJobStatusMap();
    if (status === ConversionJobStatus.NotRunning) {
      map.delete(name);
    } else {
      map.set(name, status);
    }
  }

  private getJobStatusMap(): Map<ConversionJobName, ConversionJobStatus> {
    if (!this._jobStatus) {
      this._jobStatus = new Map();
    }
    return this._jobStatus;
  }

  get embeddedMode(): boolean {
    return !!this._embeddedMode;
  }

  set embeddedMode(value: boolean) {
    this._embeddedMode = value;
  }

  get hideSidebar(): boolean {
    return !!this._hideSidebar;
  }

  set hideSidebar(value: boolean) {
    this._hideSidebar = value;
  }

  setBufferUsage(bufferUsage: number) {
    this._bufferUsage = bufferUsage;
  }

  setTrackData(id: string, data: {}) {
    this.trackDataStore.set(id, data);
  }

  setRecordingLog(recordingLog: string) {
    this._recordingLog = recordingLog;
  }

  setAggregateData(kind: string, data: AggregateData) {
    this.aggregateDataStore.set(kind, data);
  }

  getCurResolution() {
    // Truncate the resolution to the closest power of 2 (in nanosecond space).
    // We choose to work in ns space because resolution is consumed be track
    // controllers for quantization and they rely on resolution to be a power
    // of 2 in nanosecond form. This is property does not hold if we work in
    // second space.
    //
    // This effectively means the resolution changes approximately every 6 zoom
    // levels. Logic: each zoom level represents a delta of 0.1 * (visible
    // window span). Therefore, zooming out by six levels is 1.1^6 ~= 2.
    // Similarily, zooming in six levels is 0.9^6 ~= 0.5.
    const pxToSec = this.frontendLocalState.timeScale.deltaPxToDuration(1);
    // TODO(b/186265930): Remove once fixed:
    if (!isFinite(pxToSec)) {
      // Resolution is in pixels per second so 1000 means 1px = 1ms.
      console.error(`b/186265930: Bad pxToSec suppressed ${pxToSec}`);
      return fromNs(Math.pow(2, Math.floor(Math.log2(toNs(1000)))));
    }
    const pxToNs = Math.max(toNs(pxToSec), 1);
    const resolution = fromNs(Math.pow(2, Math.floor(Math.log2(pxToNs))));
    const log2 = Math.log2(toNs(resolution));
    if (log2 % 1 !== 0) {
      throw new Error(`Resolution should be a power of two.
        pxToSec: ${pxToSec},
        pxToNs: ${pxToNs},
        resolution: ${resolution},
        log2: ${Math.log2(toNs(resolution))}`);
    }
    return resolution;
  }

  getCurrentEngine(): EngineConfig|undefined {
    return this.state.engine;
  }

  get ftracePanelData(): FtracePanelData|undefined {
    return this._ftracePanelData;
  }

  set ftracePanelData(data: FtracePanelData|undefined) {
    this._ftracePanelData = data;
  }

  makeSelection(action: DeferredAction<{}>, tabToOpen = 'current_selection') {
    // A new selection should cancel the current search selection.
    globals.dispatch(Actions.setSearchIndex({index: -1}));
    const tab = action.type === 'deselect' ? undefined : tabToOpen;
    globals.dispatch(Actions.setCurrentTab({tab}));
    globals.dispatch(action);
  }

  resetForTesting() {
    this._dispatch = undefined;
    this._state = undefined;
    this._frontendLocalState = undefined;
    this._rafScheduler = undefined;
    this._serviceWorkerController = undefined;

    // TODO(hjd): Unify trackDataStore, queryResults, overviewStore, threads.
    this._trackDataStore = undefined;
    this._queryResults = undefined;
    this._overviewStore = undefined;
    this._threadMap = undefined;
    this._sliceDetails = undefined;
    this._threadStateDetails = undefined;
    this._aggregateDataStore = undefined;
    this._numQueriesQueued = 0;
    this._metricResult = undefined;
    this._currentSearchResults = {
      sliceIds: new Float64Array(0),
      tsStarts: new Float64Array(0),
      utids: new Float64Array(0),
      trackIds: [],
      sources: [],
      totalResults: 0,
    };
  }

  // This variable is set by the is_internal_user.js script if the user is a
  // googler. This is used to avoid exposing features that are not ready yet
  // for public consumption. The gated features themselves are not secret.
  // If a user has been detected as a Googler once, make that sticky in
  // localStorage, so that we keep treating them as such when they connect over
  // public networks.
  get isInternalUser() {
    if (this._isInternalUser === undefined) {
      this._isInternalUser = localStorage.getItem('isInternalUser') === '1';
    }
    return this._isInternalUser;
  }

  set isInternalUser(value: boolean) {
    localStorage.setItem('isInternalUser', value ? '1' : '0');
    this._isInternalUser = value;
  }

  get testing() {
    return this._testing;
  }

  // Used when switching to the legacy TraceViewer UI.
  // Most resources are cleaned up by replacing the current |window| object,
  // however pending RAFs and workers seem to outlive the |window| and need to
  // be cleaned up explicitly.
  shutdown() {
    this._rafScheduler!.shutdown();
  }
}

export const globals = new Globals();