/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const Services = require("Services");
const MarkupContainer = require("devtools/client/inspector/markup/views/markup-container");
const ElementEditor = require("devtools/client/inspector/markup/views/element-editor");
const { ELEMENT_NODE } = require("devtools/shared/dom-node-constants");
const { extend } = require("devtools/shared/extend");

loader.lazyRequireGetter(
  this,
  "EventTooltip",
  "devtools/client/shared/widgets/tooltip/EventTooltipHelper",
  true
);
loader.lazyRequireGetter(
  this,
  ["setImageTooltip", "setBrokenImageTooltip"],
  "devtools/client/shared/widgets/tooltip/ImageTooltipHelper",
  true
);
loader.lazyRequireGetter(
  this,
  "clipboardHelper",
  "devtools/shared/platform/clipboard"
);

const PREVIEW_MAX_DIM_PREF = "devtools.inspector.imagePreviewTooltipSize";

/**
 * An implementation of MarkupContainer for Elements that can contain
 * child nodes.
 * Allows editing of tag name, attributes, expanding / collapsing.
 *
 * @param  {MarkupView} markupView
 *         The markup view that owns this container.
 * @param  {NodeFront} node
 *         The node to display.
 */
function MarkupElementContainer(markupView, node) {
  MarkupContainer.prototype.initialize.call(
    this,
    markupView,
    node,
    "elementcontainer"
  );

  if (node.nodeType === ELEMENT_NODE) {
    this.editor = new ElementEditor(this, node);
  } else {
    throw new Error("Invalid node for MarkupElementContainer");
  }

  this.tagLine.appendChild(this.editor.elt);
}

MarkupElementContainer.prototype = extend(MarkupContainer.prototype, {
  onContainerClick: function(event) {
    if (!event.target.hasAttribute("data-event")) {
      return;
    }

    this._buildEventTooltipContent(event.target);
  },

  async _buildEventTooltipContent(target) {
    const tooltip = this.markup.eventDetailsTooltip;
    await tooltip.hide();

    const listenerInfo = await this.node.getEventListenerInfo();

    const toolbox = this.markup.toolbox;

    // Create the EventTooltip which will populate the tooltip content.
    const eventTooltip = new EventTooltip(
      tooltip,
      listenerInfo,
      toolbox,
      this.node
    );

    // Add specific styling to the "event" badge when at least one event is disabled.
    // The eventTooltip will take care of clearing the event listener when it's destroyed.
    eventTooltip.on(
      "event-tooltip-listener-toggled",
      ({ hasDisabledEventListeners }) => {
        const className = "has-disabled-events";
        if (hasDisabledEventListeners) {
          this.editor._eventBadge.classList.add(className);
        } else {
          this.editor._eventBadge.classList.remove(className);
        }
      }
    );

    // Disable the image preview tooltip while we display the event details
    this.markup._disableImagePreviewTooltip();
    tooltip.once("hidden", () => {
      eventTooltip.destroy();

      // Enable the image preview tooltip after closing the event details
      this.markup._enableImagePreviewTooltip();

      // Allow clicks on the event badge to display the event popup again
      // (but allow the currently queued click event to run first).
      this.markup.win.setTimeout(() => {
        if (this.editor._eventBadge) {
          this.editor._eventBadge.style.pointerEvents = "auto";
        }
      }, 0);
    });

    // Prevent clicks on the event badge to display the event popup again.
    if (this.editor._eventBadge) {
      this.editor._eventBadge.style.pointerEvents = "none";
    }
    tooltip.show(target);
  },

  /**
   * Generates the an image preview for this Element. The element must be an
   * image or canvas (@see isPreviewable).
   *
   * @return {Promise} that is resolved with an object of form
   *         { data, size: { naturalWidth, naturalHeight, resizeRatio } } where
   *         - data is the data-uri for the image preview.
   *         - size contains information about the original image size and if
   *         the preview has been resized.
   *
   * If this element is not previewable or the preview cannot be generated for
   * some reason, the Promise is rejected.
   */
  _getPreview: function() {
    if (!this.isPreviewable()) {
      return Promise.reject("_getPreview called on a non-previewable element.");
    }

    if (this.tooltipDataPromise) {
      // A preview request is already pending. Re-use that request.
      return this.tooltipDataPromise;
    }

    // Fetch the preview from the server.
    this.tooltipDataPromise = async function() {
      const maxDim = Services.prefs.getIntPref(PREVIEW_MAX_DIM_PREF);
      const preview = await this.node.getImageData(maxDim);
      const data = await preview.data.string();

      // Clear the pending preview request. We can't reuse the results later as
      // the preview contents might have changed.
      this.tooltipDataPromise = null;
      return { data, size: preview.size };
    }.bind(this)();

    return this.tooltipDataPromise;
  },

  /**
   * Executed by MarkupView._isImagePreviewTarget which is itself called when
   * the mouse hovers over a target in the markup-view.
   * Checks if the target is indeed something we want to have an image tooltip
   * preview over and, if so, inserts content into the tooltip.
   *
   * @return {Promise} that resolves when the tooltip content is ready. Resolves
   * true if the tooltip should be displayed, false otherwise.
   */
  async isImagePreviewTarget(target, tooltip) {
    // Is this Element previewable.
    if (!this.isPreviewable()) {
      return false;
    }

    // If the Element has an src attribute, the tooltip is shown when hovering
    // over the src url. If not, the tooltip is shown when hovering over the tag
    // name.
    const src = this.editor.getAttributeElement("src");
    const expectedTarget = src ? src.querySelector(".link") : this.editor.tag;
    if (target !== expectedTarget) {
      return false;
    }

    try {
      const { data, size } = await this._getPreview();
      // The preview is ready.
      const options = {
        naturalWidth: size.naturalWidth,
        naturalHeight: size.naturalHeight,
        maxDim: Services.prefs.getIntPref(PREVIEW_MAX_DIM_PREF),
      };

      setImageTooltip(tooltip, this.markup.doc, data, options);
    } catch (e) {
      // Indicate the failure but show the tooltip anyway.
      setBrokenImageTooltip(tooltip, this.markup.doc);
    }
    return true;
  },

  copyImageDataUri: function() {
    // We need to send again a request to gettooltipData even if one was sent
    // for the tooltip, because we want the full-size image
    this.node.getImageData().then(data => {
      data.data.string().then(str => {
        clipboardHelper.copyString(str);
      });
    });
  },

  setInlineTextChild: function(inlineTextChild) {
    this.inlineTextChild = inlineTextChild;
    this.editor.updateTextEditor();
  },

  clearInlineTextChild: function() {
    this.inlineTextChild = undefined;
    this.editor.updateTextEditor();
  },

  /**
   * Trigger new attribute field for input.
   */
  addAttribute: function() {
    this.editor.newAttr.editMode();
  },

  /**
   * Trigger attribute field for editing.
   */
  editAttribute: function(attrName) {
    this.editor.attrElements.get(attrName).editMode();
  },

  /**
   * Remove attribute from container.
   * This is an undoable action.
   */
  removeAttribute: function(attrName) {
    const doMods = this.editor._startModifyingAttributes();
    const undoMods = this.editor._startModifyingAttributes();
    this.editor._saveAttribute(attrName, undoMods);
    doMods.removeAttribute(attrName);
    this.undo.do(
      () => {
        doMods.apply();
      },
      () => {
        undoMods.apply();
      }
    );
  },
});

module.exports = MarkupElementContainer;
