/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @implements {Bindings.CSSWorkspaceBinding.SourceMapping}
 * @unrestricted
 */
export default class StylesSourceMapping {
  /**
   * @param {!SDK.CSSModel} cssModel
   * @param {!Workspace.Workspace} workspace
   */
  constructor(cssModel, workspace) {
    this._cssModel = cssModel;
    const target = this._cssModel.target();
    this._project = new Bindings.ContentProviderBasedProject(
        workspace, 'css:' + target.id(), Workspace.projectTypes.Network, '', false /* isServiceProject */);
    Bindings.NetworkProject.setTargetForProject(this._project, target);

    /** @type {!Map.<string, !StyleFile>} */
    this._styleFiles = new Map();
    this._eventListeners = [
      this._cssModel.addEventListener(SDK.CSSModel.Events.StyleSheetAdded, this._styleSheetAdded, this),
      this._cssModel.addEventListener(SDK.CSSModel.Events.StyleSheetRemoved, this._styleSheetRemoved, this),
      this._cssModel.addEventListener(SDK.CSSModel.Events.StyleSheetChanged, this._styleSheetChanged, this),
    ];
  }

  /**
   * @override
   * @param {!SDK.CSSLocation} rawLocation
   * @return {?Workspace.UILocation}
   */
  rawLocationToUILocation(rawLocation) {
    const header = rawLocation.header();
    if (!header || !this._acceptsHeader(header)) {
      return null;
    }
    const styleFile = this._styleFiles.get(header.resourceURL());
    if (!styleFile) {
      return null;
    }
    let lineNumber = rawLocation.lineNumber;
    let columnNumber = rawLocation.columnNumber;
    if (header.isInline && header.hasSourceURL) {
      lineNumber -= header.lineNumberInSource(0);
      columnNumber -= header.columnNumberInSource(lineNumber, 0);
    }
    return styleFile._uiSourceCode.uiLocation(lineNumber, columnNumber);
  }

  /**
   * @override
   * @param {!Workspace.UILocation} uiLocation
   * @return {!Array<!SDK.CSSLocation>}
   */
  uiLocationToRawLocations(uiLocation) {
    const styleFile = uiLocation.uiSourceCode[StyleFile._symbol];
    if (!styleFile) {
      return [];
    }
    const rawLocations = [];
    for (const header of styleFile._headers) {
      let lineNumber = uiLocation.lineNumber;
      let columnNumber = uiLocation.columnNumber;
      if (header.isInline && header.hasSourceURL) {
        columnNumber = header.columnNumberInSource(lineNumber, columnNumber);
        lineNumber = header.lineNumberInSource(lineNumber);
      }
      rawLocations.push(new SDK.CSSLocation(header, lineNumber, columnNumber));
    }
    return rawLocations;
  }

  /**
   * @param {!SDK.CSSStyleSheetHeader} header
   */
  _acceptsHeader(header) {
    if (header.isInline && !header.hasSourceURL && header.origin !== 'inspector') {
      return false;
    }
    if (!header.resourceURL()) {
      return false;
    }
    return true;
  }

  /**
   * @param {!Common.Event} event
   */
  _styleSheetAdded(event) {
    const header = /** @type {!SDK.CSSStyleSheetHeader} */ (event.data);
    if (!this._acceptsHeader(header)) {
      return;
    }

    const url = header.resourceURL();
    let styleFile = this._styleFiles.get(url);
    if (!styleFile) {
      styleFile = new StyleFile(this._cssModel, this._project, header);
      this._styleFiles.set(url, styleFile);
    } else {
      styleFile.addHeader(header);
    }
  }

  /**
   * @param {!Common.Event} event
   */
  _styleSheetRemoved(event) {
    const header = /** @type {!SDK.CSSStyleSheetHeader} */ (event.data);
    if (!this._acceptsHeader(header)) {
      return;
    }
    const url = header.resourceURL();
    const styleFile = this._styleFiles.get(url);
    if (styleFile._headers.size === 1) {
      styleFile.dispose();
      this._styleFiles.delete(url);
    } else {
      styleFile.removeHeader(header);
    }
  }

  /**
   * @param {!Common.Event} event
   */
  _styleSheetChanged(event) {
    const header = this._cssModel.styleSheetHeaderForId(event.data.styleSheetId);
    if (!header || !this._acceptsHeader(header)) {
      return;
    }
    const styleFile = this._styleFiles.get(header.resourceURL());
    styleFile._styleSheetChanged(header);
  }

  dispose() {
    for (const styleFile of this._styleFiles.values()) {
      styleFile.dispose();
    }
    this._styleFiles.clear();
    Common.EventTarget.removeEventListeners(this._eventListeners);
    this._project.removeProject();
  }
}

/**
 * @implements {Common.ContentProvider}
 * @unrestricted
 */
export class StyleFile {
  /**
   * @param {!SDK.CSSModel} cssModel
   * @param {!Bindings.ContentProviderBasedProject} project
   * @param {!SDK.CSSStyleSheetHeader} header
   */
  constructor(cssModel, project, header) {
    this._cssModel = cssModel;
    this._project = project;
    /** @type {!Set<!SDK.CSSStyleSheetHeader>} */
    this._headers = new Set([header]);

    const target = cssModel.target();

    const url = header.resourceURL();
    const metadata = Bindings.metadataForURL(target, header.frameId, url);

    this._uiSourceCode = this._project.createUISourceCode(url, header.contentType());
    this._uiSourceCode[StyleFile._symbol] = this;
    Bindings.NetworkProject.setInitialFrameAttribution(this._uiSourceCode, header.frameId);
    this._project.addUISourceCodeWithProvider(this._uiSourceCode, this, metadata, 'text/css');

    this._eventListeners = [
      this._uiSourceCode.addEventListener(
          Workspace.UISourceCode.Events.WorkingCopyChanged, this._workingCopyChanged, this),
      this._uiSourceCode.addEventListener(
          Workspace.UISourceCode.Events.WorkingCopyCommitted, this._workingCopyCommitted, this)
    ];
    this._throttler = new Common.Throttler(StyleFile.updateTimeout);
    this._terminated = false;
  }

  /**
   * @param {!SDK.CSSStyleSheetHeader} header
   */
  addHeader(header) {
    this._headers.add(header);
    Bindings.NetworkProject.addFrameAttribution(this._uiSourceCode, header.frameId);
  }

  /**
   * @param {!SDK.CSSStyleSheetHeader} header
   */
  removeHeader(header) {
    this._headers.delete(header);
    Bindings.NetworkProject.removeFrameAttribution(this._uiSourceCode, header.frameId);
  }

  /**
   * @param {!SDK.CSSStyleSheetHeader} header
   */
  _styleSheetChanged(header) {
    console.assert(this._headers.has(header));
    if (this._isUpdatingHeaders || !this._headers.has(header)) {
      return;
    }
    const mirrorContentBound = this._mirrorContent.bind(this, header, true /* majorChange */);
    this._throttler.schedule(mirrorContentBound, false /* asSoonAsPossible */);
  }

  /**
   * @param {!Common.Event} event
   */
  _workingCopyCommitted(event) {
    if (this._isAddingRevision) {
      return;
    }
    const mirrorContentBound = this._mirrorContent.bind(this, this._uiSourceCode, true /* majorChange */);
    this._throttler.schedule(mirrorContentBound, true /* asSoonAsPossible */);
  }

  /**
   * @param {!Common.Event} event
   */
  _workingCopyChanged(event) {
    if (this._isAddingRevision) {
      return;
    }
    const mirrorContentBound = this._mirrorContent.bind(this, this._uiSourceCode, false /* majorChange */);
    this._throttler.schedule(mirrorContentBound, false /* asSoonAsPossible */);
  }

  /**
   * @param {!Common.ContentProvider} fromProvider
   * @param {boolean} majorChange
   * @return {!Promise}
   */
  async _mirrorContent(fromProvider, majorChange) {
    if (this._terminated) {
      this._styleFileSyncedForTest();
      return;
    }

    let newContent = null;
    if (fromProvider === this._uiSourceCode) {
      newContent = this._uiSourceCode.workingCopy();
    } else {
      const deferredContent = await fromProvider.requestContent();
      newContent = deferredContent.content;
    }

    if (newContent === null || this._terminated) {
      this._styleFileSyncedForTest();
      return;
    }

    if (fromProvider !== this._uiSourceCode) {
      this._isAddingRevision = true;
      this._uiSourceCode.addRevision(newContent);
      this._isAddingRevision = false;
    }

    this._isUpdatingHeaders = true;
    const promises = [];
    for (const header of this._headers) {
      if (header === fromProvider) {
        continue;
      }
      promises.push(this._cssModel.setStyleSheetText(header.id, newContent, majorChange));
    }
    // ------ ASYNC ------
    await Promise.all(promises);
    this._isUpdatingHeaders = false;
    this._styleFileSyncedForTest();
  }

  _styleFileSyncedForTest() {
  }

  dispose() {
    if (this._terminated) {
      return;
    }
    this._terminated = true;
    this._project.removeFile(this._uiSourceCode.url());
    Common.EventTarget.removeEventListeners(this._eventListeners);
  }

  /**
   * @override
   * @return {string}
   */
  contentURL() {
    return this._headers.firstValue().originalContentProvider().contentURL();
  }

  /**
   * @override
   * @return {!Common.ResourceType}
   */
  contentType() {
    return this._headers.firstValue().originalContentProvider().contentType();
  }

  /**
   * @override
   * @return {!Promise<boolean>}
   */
  contentEncoded() {
    return this._headers.firstValue().originalContentProvider().contentEncoded();
  }

  /**
   * @override
   * @return {!Promise<!Common.DeferredContent>}
   */
  requestContent() {
    return this._headers.firstValue().originalContentProvider().requestContent();
  }

  /**
   * @override
   * @param {string} query
   * @param {boolean} caseSensitive
   * @param {boolean} isRegex
   * @return {!Promise<!Array<!Common.ContentProvider.SearchMatch>>}
   */
  searchInContent(query, caseSensitive, isRegex) {
    return this._headers.firstValue().originalContentProvider().searchInContent(query, caseSensitive, isRegex);
  }
}

StyleFile._symbol = Symbol('Bindings.StyleFile._symbol');

StyleFile.updateTimeout = 200;

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

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

/** @constructor */
Bindings.StylesSourceMapping = StylesSourceMapping;

/** @constructor */
Bindings.StyleFile = StyleFile;