/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

const { TelemetryTestUtils } = ChromeUtils.importESModule(
  "resource://testing-common/TelemetryTestUtils.sys.mjs"
);
const { UrlbarTestUtils } = ChromeUtils.importESModule(
  "resource://testing-common/UrlbarTestUtils.sys.mjs"
);

const TEST_ROOT = getRootDirectory(gTestPath).replace(
  "chrome://mochitests/content",
  "http://example.com"
);

const TEST_PAGE = TEST_ROOT + "test-page.html";
const SHORT_TEST_PAGE = TEST_ROOT + "short-test-page.html";
const LARGE_TEST_PAGE = TEST_ROOT + "large-test-page.html";

const MAX_CAPTURE_DIMENSION = 32767;
const MAX_CAPTURE_AREA = 124925329;

const gScreenshotUISelectors = {
  panelButtons: "#screenshotsPagePanel",
  fullPageButton: "button.full-page",
  visiblePageButton: "button.visible-page",
  copyButton: "button.#copy",
};

// MouseEvents is for the mouse events on the Anonymous content
const MouseEvents = {
  mouse: new Proxy(
    {},
    {
      get: (target, name) =>
        async function (x, y, selector = ":root") {
          if (name === "click") {
            this.down(x, y);
            this.up(x, y);
          } else {
            await safeSynthesizeMouseEventInContentPage(selector, x, y, {
              type: "mouse" + name,
            });
          }
        },
    }
  ),
};

const { mouse } = MouseEvents;

class ScreenshotsHelper {
  constructor(browser) {
    this.browser = browser;
    this.selector = gScreenshotUISelectors;
  }

  get toolbarButton() {
    return document.getElementById("screenshot-button");
  }

  /**
   * Click the screenshots button in the toolbar
   */
  triggerUIFromToolbar() {
    let button = this.toolbarButton;
    ok(
      BrowserTestUtils.is_visible(button),
      "The screenshot toolbar button is visible"
    );
    button.click();
  }

  async waitForPanel() {
    let panel = this.browser.ownerDocument.querySelector(
      "#screenshotsPagePanel"
    );
    await BrowserTestUtils.waitForCondition(async () => {
      if (!panel) {
        panel = this.browser.ownerDocument.querySelector(
          "#screenshotsPagePanel"
        );
      }
      return panel?.state === "open" && BrowserTestUtils.is_visible(panel);
    });
    return panel;
  }

  async waitForOverlay() {
    const panel = await this.waitForPanel();
    ok(BrowserTestUtils.is_visible(panel), "Panel buttons are visible");

    await BrowserTestUtils.waitForCondition(async () => {
      let init = await this.isOverlayInitialized();
      return init;
    });
    info("Overlay is visible");
  }

  async waitForOverlayClosed() {
    let panel = this.browser.ownerDocument.querySelector(
      "#screenshotsPagePanel"
    );
    if (!panel) {
      panel = await this.waitForPanel();
    }
    await BrowserTestUtils.waitForMutationCondition(
      panel,
      { attributes: true },
      () => {
        return BrowserTestUtils.is_hidden(panel);
      }
    );
    ok(BrowserTestUtils.is_hidden(panel), "Panel buttons are hidden");

    await BrowserTestUtils.waitForCondition(async () => {
      let init = !(await this.isOverlayInitialized());
      info("Is overlay initialized: " + !init);
      return init;
    });
    info("Overlay is not visible");
  }

  async isOverlayInitialized() {
    return SpecialPowers.spawn(this.browser, [], () => {
      let screenshotsChild = content.windowGlobalChild.getActor(
        "ScreenshotsComponent"
      );
      return screenshotsChild?._overlay?._initialized;
    });
  }

  async getOverlayState() {
    return ContentTask.spawn(this.browser, null, async () => {
      let screenshotsChild = content.windowGlobalChild.getActor(
        "ScreenshotsComponent"
      );
      return screenshotsChild._overlay.stateHandler.getState();
    });
  }

  async waitForStateChange(newState) {
    await BrowserTestUtils.waitForCondition(async () => {
      let state = await this.getOverlayState();
      return state === newState;
    }, `Waiting for state change to ${newState}`);
  }

  async getHoverElementRect() {
    return ContentTask.spawn(this.browser, null, async () => {
      let screenshotsChild = content.windowGlobalChild.getActor(
        "ScreenshotsComponent"
      );
      return screenshotsChild._overlay.stateHandler.getHoverElementBoxRect();
    });
  }

  async waitForHoverElementRect() {
    return TestUtils.waitForCondition(async () => {
      let rect = await this.getHoverElementRect();
      return rect;
    });
  }

  async waitForSelectionBoxSizeChange(currentWidth) {
    await ContentTask.spawn(
      this.browser,
      [currentWidth],
      async ([currWidth]) => {
        let screenshotsChild = content.windowGlobalChild.getActor(
          "ScreenshotsComponent"
        );

        let dimensions =
          screenshotsChild._overlay.screenshotsContainer.getSelectionLayerDimensions();
        // return dimensions.boxWidth;
        await ContentTaskUtils.waitForCondition(() => {
          dimensions =
            screenshotsChild._overlay.screenshotsContainer.getSelectionLayerDimensions();
          return dimensions.boxWidth !== currWidth;
        }, "Wait for selection box width change");
      }
    );
  }

  /**
   * This will drag an overlay starting at the given startX and startY coordinates and ending
   * at the given endX and endY coordinates.
   *
   * endY should be at least 70px from the bottom of window and endX should be at least
   * 265px from the left of the window. If these requirements are not met then the
   * overlay buttons (cancel, copy, download) will be positioned different from the default
   * and the methods to click the overlay buttons will not work unless the updated
   * position coordinates are supplied.
   * See https://searchfox.org/mozilla-central/rev/af78418c4b5f2c8721d1a06486cf4cf0b33e1e8d/browser/components/screenshots/ScreenshotsOverlayChild.sys.mjs#1789,1798
   * for how the overlay buttons are positioned when the overlay rect is near the bottom or
   * left edge of the window.
   *
   * Note: The distance of the rect should be greater than 40 to enter in the "dragging" state.
   * See https://searchfox.org/mozilla-central/rev/af78418c4b5f2c8721d1a06486cf4cf0b33e1e8d/browser/components/screenshots/ScreenshotsOverlayChild.sys.mjs#809
   * @param {Number} startX The starting X coordinate. The left edge of the overlay rect.
   * @param {Number} startY The starting Y coordinate. The top edge of the overlay rect.
   * @param {Number} endX The end X coordinate. The right edge of the overlay rect.
   * @param {Number} endY The end Y coordinate. The bottom edge of the overlay rect.
   */
  async dragOverlay(startX, startY, endX, endY) {
    await this.waitForStateChange("crosshairs");
    let state = await this.getOverlayState();
    Assert.equal(state, "crosshairs", "The overlay is in the crosshairs state");

    mouse.down(startX, startY);

    await this.waitForStateChange("draggingReady");
    state = await this.getOverlayState();
    Assert.equal(
      state,
      "draggingReady",
      "The overlay is in the draggingReady state"
    );

    mouse.move(endX, endY);

    await this.waitForStateChange("dragging");
    state = await this.getOverlayState();
    Assert.equal(state, "dragging", "The overlay is in the dragging state");

    mouse.up(endX, endY);

    await this.waitForStateChange("selected");
    state = await this.getOverlayState();
    Assert.equal(state, "selected", "The overlay is in the selected state");

    this.endX = endX;
    this.endY = endY;
  }

  async scrollContentWindow(x, y) {
    let promise = BrowserTestUtils.waitForContentEvent(this.browser, "scroll");
    await ContentTask.spawn(this.browser, [x, y], async ([xPos, yPos]) => {
      content.window.scroll(xPos, yPos);

      await ContentTaskUtils.waitForCondition(() => {
        return (
          content.window.scrollX === xPos && content.window.scrollY === yPos
        );
      }, `Waiting for window to scroll to ${xPos}, ${yPos}`);
    });
    await promise;
  }

  getWindowPosition() {
    return ContentTask.spawn(this.browser, [], () => {
      return {
        scrollX: content.window.scrollX,
        scrollY: content.window.scrollY,
      };
    });
  }

  async waitForScrollTo(x, y) {
    await ContentTask.spawn(this.browser, [x, y], async ([xPos, yPos]) => {
      await ContentTaskUtils.waitForCondition(() => {
        info(
          `Got scrollX: ${content.window.scrollX}. scrollY: ${content.window.scrollY}`
        );
        return (
          content.window.scrollX === xPos && content.window.scrollY === yPos
        );
      }, `Waiting for window to scroll to ${xPos}, ${yPos}`);
    });
  }

  clickDownloadButton() {
    // Click the download button with last x and y position from dragOverlay.
    // The middle of the copy button is last X - 70 and last Y + 36.
    // Ex. 500, 500 would be 530, 536
    mouse.click(this.endX - 70, this.endY + 36);
  }

  clickCopyButton(overrideX = null, overrideY = null) {
    // Click the copy button with last x and y position from dragOverlay.
    // The middle of the copy button is last X - 183 and last Y + 36.
    // Ex. 500, 500 would be 317, 536
    if (overrideX && overrideY) {
      mouse.click(overrideX - 183, overrideY + 36);
    } else {
      mouse.click(this.endX - 183, this.endY + 36);
    }
  }

  clickCancelButton() {
    // Click the cancel button with last x and y position from dragOverlay.
    // The middle of the copy button is last X - 259 and last Y + 36.
    // Ex. 500, 500 would be 241, 536
    mouse.click(this.endX - 259, this.endY + 36);
  }

  async clickTestPageElement() {
    let rect = await ContentTask.spawn(this.browser, [], async () => {
      let ele = content.document.getElementById("testPageElement");
      return ele.getBoundingClientRect();
    });

    let x = Math.floor(rect.x + rect.width / 2);
    let y = Math.floor(rect.y + rect.height / 2);

    mouse.move(x, y);
    await this.waitForHoverElementRect();
    mouse.down(x, y);
    await this.waitForStateChange("draggingReady");
    mouse.up(x, y);
    await this.waitForStateChange("selected");
  }

  async zoomBrowser(zoom) {
    await SpecialPowers.spawn(this.browser, [zoom], zoomLevel => {
      const { Layout } = ChromeUtils.importESModule(
        "chrome://mochitests/content/browser/accessible/tests/browser/Layout.sys.mjs"
      );
      Layout.zoomDocument(content.document, zoomLevel);
    });
  }

  /**
   * Gets the dialog box
   * @returns The dialog box
   */
  getDialog() {
    let currDialogBox = this.browser.tabDialogBox;
    let manager = currDialogBox.getTabDialogManager();
    let dialogs = manager.hasDialogs && manager.dialogs;
    return dialogs[0];
  }

  assertPanelVisible() {
    let panel = this.browser.ownerDocument.querySelector(
      "#screenshotsPagePanel"
    );
    Assert.ok(
      BrowserTestUtils.is_visible(panel),
      "Screenshots panel is visible"
    );
  }

  assertPanelNotVisible() {
    let panel = this.browser.ownerDocument.querySelector(
      "#screenshotsPagePanel"
    );
    Assert.ok(
      BrowserTestUtils.is_hidden(panel),
      "Screenshots panel is not visible"
    );
  }

  /**
   * Copied from screenshots extension
   * Returns a promise that resolves when the clipboard data has changed
   * Otherwise rejects
   */
  waitForRawClipboardChange() {
    const initialClipboardData = Date.now().toString();
    SpecialPowers.clipboardCopyString(initialClipboardData);

    let promiseChanged = TestUtils.waitForCondition(() => {
      let data;
      try {
        data = getRawClipboardData("image/png");
      } catch (e) {
        console.log("Failed to get image/png clipboard data:", e);
        return false;
      }
      return data && initialClipboardData !== data;
    });
    return promiseChanged;
  }

  /**
   * Gets the client and scroll demensions on the window
   * @returns { Object }
   *   clientHeight The visible height
   *   clientWidth The visible width
   *   scrollHeight The scrollable height
   *   scrollWidth The scrollable width
   */
  getContentDimensions() {
    return SpecialPowers.spawn(this.browser, [], async function () {
      let { innerWidth, innerHeight, scrollMaxX, scrollMaxY } = content.window;
      let width = innerWidth + scrollMaxX;
      let height = innerHeight + scrollMaxY;

      const scrollbarHeight = {};
      const scrollbarWidth = {};
      content.window.windowUtils.getScrollbarSize(
        false,
        scrollbarWidth,
        scrollbarHeight
      );
      width -= scrollbarWidth.value;
      height -= scrollbarHeight.value;
      innerWidth -= scrollbarWidth.value;
      innerHeight -= scrollbarHeight.value;

      return {
        clientHeight: innerHeight,
        clientWidth: innerWidth,
        scrollHeight: height,
        scrollWidth: width,
      };
    });
  }

  getSelectionLayerDimensions() {
    return ContentTask.spawn(this.browser, null, async () => {
      let screenshotsChild = content.windowGlobalChild.getActor(
        "ScreenshotsComponent"
      );
      Assert.ok(screenshotsChild._overlay._initialized, "The overlay exists");

      return screenshotsChild._overlay.screenshotsContainer.getSelectionLayerDimensions();
    });
  }

  async waitForSelectionLayerDimensionChange(oldWidth, oldHeight) {
    await ContentTask.spawn(
      this.browser,
      [oldWidth, oldHeight],
      async ([prevWidth, prevHeight]) => {
        let screenshotsChild = content.windowGlobalChild.getActor(
          "ScreenshotsComponent"
        );

        await ContentTaskUtils.waitForCondition(() => {
          let dimensions =
            screenshotsChild._overlay.screenshotsContainer.getSelectionLayerDimensions();
          info(
            `old height: ${prevHeight}. new height: ${dimensions.scrollHeight}.\nold width: ${prevWidth}. new width: ${dimensions.scrollWidth}`
          );
          return (
            dimensions.scrollHeight !== prevHeight &&
            dimensions.scrollWidth !== prevWidth
          );
        }, "Wait for selection box width change");
      }
    );
  }

  getSelectionBoxDimensions() {
    return ContentTask.spawn(this.browser, null, async () => {
      let screenshotsChild = content.windowGlobalChild.getActor(
        "ScreenshotsComponent"
      );
      Assert.ok(screenshotsChild._overlay._initialized, "The overlay exists");

      return screenshotsChild._overlay.screenshotsContainer.getSelectionLayerBoxDimensions();
    });
  }

  /**
   * Clicks an element on the screen
   * @param eleSel The selector for the element to click
   */
  async clickUIElement(eleSel) {
    await SpecialPowers.spawn(
      this.browser,
      [eleSel],
      async function (eleSelector) {
        info(
          `in clickScreenshotsUIElement content function, eleSelector: ${eleSelector}`
        );
        const EventUtils = ContentTaskUtils.getEventUtils(content);
        let ele = content.document.querySelector(eleSelector);
        info(`Found the thing to click: ${eleSelector}: ${!!ele}`);

        EventUtils.synthesizeMouseAtCenter(ele, {});
        // wait a frame for the screenshots UI to finish any init
        await new content.Promise(res => content.requestAnimationFrame(res));
      }
    );
  }

  /**
   * Copied from screenshots extension
   * A helper that returns the size of the image that was just put into the clipboard by the
   * :screenshot command.
   * @return The {width, height, color} dimension and color object.
   */
  async getImageSizeAndColorFromClipboard() {
    let flavor = "image/png";
    let image = getRawClipboardData(flavor);
    ok(image, "screenshot data exists on the clipboard");

    // Due to the differences in how images could be stored in the clipboard the
    // checks below are needed. The clipboard could already provide the image as
    // byte streams or as image container. If it's not possible obtain a
    // byte stream, the function throws.

    if (image instanceof Ci.imgIContainer) {
      image = Cc["@mozilla.org/image/tools;1"]
        .getService(Ci.imgITools)
        .encodeImage(image, flavor);
    }

    if (!(image instanceof Ci.nsIInputStream)) {
      throw new Error("Unable to read image data");
    }

    const binaryStream = Cc["@mozilla.org/binaryinputstream;1"].createInstance(
      Ci.nsIBinaryInputStream
    );
    binaryStream.setInputStream(image);
    const available = binaryStream.available();
    const buffer = new ArrayBuffer(available);
    is(
      binaryStream.readArrayBuffer(available, buffer),
      available,
      "Read expected amount of data"
    );

    // We are going to load the image in the content page to measure its size.
    // We don't want to insert the image directly in the browser's document
    // which could mess all sorts of things up
    return SpecialPowers.spawn(
      this.browser,
      [buffer],
      async function (_buffer) {
        const img = content.document.createElement("img");
        const loaded = new Promise(r => {
          img.addEventListener("load", r, { once: true });
        });
        const url = content.URL.createObjectURL(
          new Blob([_buffer], { type: "image/png" })
        );

        img.src = url;
        content.document.documentElement.appendChild(img);

        info("Waiting for the clipboard image to load in the content page");
        await loaded;

        let canvas = content.document.createElementNS(
          "http://www.w3.org/1999/xhtml",
          "html:canvas"
        );
        let context = canvas.getContext("2d");
        canvas.width = img.width;
        canvas.height = img.height;
        context.drawImage(img, 0, 0);
        let topLeft = context.getImageData(0, 0, 1, 1);
        let topRight = context.getImageData(img.width - 1, 0, 1, 1);
        let bottomLeft = context.getImageData(0, img.height - 1, 1, 1);
        let bottomRight = context.getImageData(
          img.width - 1,
          img.height - 1,
          1,
          1
        );

        img.remove();
        content.URL.revokeObjectURL(url);

        return {
          width: img.width,
          height: img.height,
          color: {
            topLeft: topLeft.data,
            topRight: topRight.data,
            bottomLeft: bottomLeft.data,
            bottomRight: bottomRight.data,
          },
        };
      }
    );
  }
}

/**
 * Get the raw clipboard data
 * @param flavor Type of data to get from clipboard
 * @returns The data from the clipboard
 */
function getRawClipboardData(flavor) {
  const whichClipboard = Services.clipboard.kGlobalClipboard;
  const xferable = Cc["@mozilla.org/widget/transferable;1"].createInstance(
    Ci.nsITransferable
  );
  xferable.init(null);
  xferable.addDataFlavor(flavor);
  Services.clipboard.getData(xferable, whichClipboard);
  let data = {};
  try {
    // xferable.getTransferData(flavor, data);
    xferable.getAnyTransferData({}, data);
    info(JSON.stringify(data, null, 2));
  } catch (e) {
    info(e);
  }
  data = data.value || null;
  return data;
}

/**
 * Synthesize a mouse event on an element, after ensuring that it is visible
 * in the viewport.
 *
 * @param {String} selector: The node selector to get the node target for the event.
 * @param {number} x
 * @param {number} y
 * @param {object} options: Options that will be passed to BrowserTestUtils.synthesizeMouse
 */
async function safeSynthesizeMouseEventInContentPage(
  selector,
  x,
  y,
  options = {}
) {
  let context = gBrowser.selectedBrowser.browsingContext;
  BrowserTestUtils.synthesizeMouse(selector, x, y, options, context);
}

add_setup(async () => {
  CustomizableUI.addWidgetToArea(
    "screenshot-button",
    CustomizableUI.AREA_NAVBAR
  );
  let screenshotBtn = document.getElementById("screenshot-button");
  Assert.ok(screenshotBtn, "The screenshots button was added to the nav bar");
});

function getContentDevicePixelRatio(browser) {
  return SpecialPowers.spawn(browser, [], async function () {
    return content.window.devicePixelRatio;
  });
}

async function clearAllTelemetryEvents() {
  // Clear everything.
  info("Clearing all telemetry events");
  await TestUtils.waitForCondition(() => {
    Services.telemetry.clearEvents();
    let events = Services.telemetry.snapshotEvents(
      Ci.nsITelemetry.DATASET_PRERELEASE_CHANNELS,
      true
    );
    let content = events.content;
    let parent = events.parent;

    return (!content && !parent) || (!content.length && !parent.length);
  });
}

async function waitForScreenshotsEventCount(count, process = "parent") {
  await TestUtils.waitForCondition(
    () => {
      let events = TelemetryTestUtils.getEvents(
        { category: "screenshots" },
        { process }
      );

      info(`Got ${events?.length} event(s)`);
      info(`Actual events: ${JSON.stringify(events, null, 2)}`);
      return events.length === count ? events : null;
    },
    `Waiting for ${count} ${process} event(s).`,
    200,
    100
  );
}

async function assertScreenshotsEvents(expectedEvents, process = "parent") {
  info(`Expected events: ${JSON.stringify(expectedEvents, null, 2)}`);
  // Make sure we have recorded the correct number of events
  await waitForScreenshotsEventCount(expectedEvents.length, process);

  TelemetryTestUtils.assertEvents(
    expectedEvents,
    { category: "screenshots", clear: true },
    { process }
  );
}