/* Copyright 2020 Mozilla Foundation
 *
 * 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 os from "os";
const isMac = os.platform() === "darwin";

function loadAndWait(filename, selector, zoom, pageSetup) {
  return Promise.all(
    global.integrationSessions.map(async session => {
      const page = await session.browser.newPage();

      // In order to avoid errors because of checks which depend on
      // a locale.
      await page.evaluateOnNewDocument(() => {
        Object.defineProperty(navigator, "language", {
          get() {
            return "en-US";
          },
        });
        Object.defineProperty(navigator, "languages", {
          get() {
            return ["en-US", "en"];
          },
        });
      });

      const url = `${
        global.integrationBaseUrl
      }?file=/test/pdfs/${filename}#zoom=${zoom ?? "page-fit"}`;

      await page.goto(url);
      if (pageSetup) {
        await pageSetup(page);
      }

      await page.bringToFront();
      await page.waitForSelector(selector, {
        timeout: 0,
      });
      return [session.name, page];
    })
  );
}

function closePages(pages) {
  return Promise.all(
    pages.map(async ([_, page]) => {
      // Avoid to keep something from a previous test.
      await page.evaluate(() => window.localStorage.clear());
      await page.close();
    })
  );
}

async function clearInput(page, selector) {
  await page.click(selector);
  await kbSelectAll(page);
  await page.keyboard.press("Backspace");
  await page.waitForTimeout(10);
}

function getSelector(id) {
  return `[data-element-id="${id}"]`;
}

function getQuerySelector(id) {
  return `document.querySelector('${getSelector(id)}')`;
}

function getComputedStyleSelector(id) {
  return `getComputedStyle(${getQuerySelector(id)})`;
}

function getEditorSelector(n) {
  return `#pdfjs_internal_editor_${n}`;
}

function getSelectedEditors(page) {
  return page.evaluate(() => {
    const elements = document.querySelectorAll(".selectedEditor");
    const results = [];
    for (const { id } of elements) {
      results.push(parseInt(id.split("_").at(-1)));
    }
    results.sort();
    return results;
  });
}

async function waitForEvent(page, eventName, timeout = 5000) {
  const hasTimedout = await Promise.race([
    // add event listener and wait for event to fire before returning
    page.evaluate(
      name =>
        new Promise(resolve => {
          document.addEventListener(name, () => resolve(false), { once: true });
        }),
      eventName
    ),
    page.evaluate(
      timeOut =>
        new Promise(resolve => {
          setTimeout(() => resolve(true), timeOut);
        }),
      timeout
    ),
  ]);
  if (hasTimedout === true) {
    console.log(`waitForEvent: timeout waiting for ${eventName}`);
  }
}

async function waitForStorageEntries(page, nEntries) {
  return page.waitForFunction(
    n => window.PDFViewerApplication.pdfDocument.annotationStorage.size === n,
    {},
    nEntries
  );
}

async function waitForSerialized(page, nEntries) {
  return page.waitForFunction(
    n =>
      (window.PDFViewerApplication.pdfDocument.annotationStorage.serializable
        .map?.size ?? 0) === n,
    {},
    nEntries
  );
}

async function waitForSelectedEditor(page, selector) {
  return page.waitForSelector(`${selector}.selectedEditor`);
}

async function waitForUnselectedEditor(page, selector) {
  return page.waitForSelector(`${selector}:not(.selectedEditor)`);
}

async function mockClipboard(pages) {
  return Promise.all(
    pages.map(async ([_, page]) => {
      await page.evaluate(() => {
        let data = null;
        const clipboard = {
          writeText: async text => (data = text),
          readText: async () => data,
        };
        Object.defineProperty(navigator, "clipboard", { value: clipboard });
      });
    })
  );
}

async function getSerialized(page, filter = undefined) {
  const values = await page.evaluate(() => {
    const { map } =
      window.PDFViewerApplication.pdfDocument.annotationStorage.serializable;
    return map ? [...map.values()] : [];
  });
  return filter ? values.map(filter) : values;
}

async function getFirstSerialized(page, filter = undefined) {
  return (await getSerialized(page, filter))[0];
}

function getEditors(page, kind) {
  return page.evaluate(aKind => {
    const elements = document.querySelectorAll(`.${aKind}Editor`);
    const results = [];
    for (const { id } of elements) {
      results.push(id);
    }
    return results;
  }, kind);
}

function getEditorDimensions(page, id) {
  return page.evaluate(n => {
    const element = document.getElementById(`pdfjs_internal_editor_${n}`);
    const { style } = element;
    return {
      left: style.left,
      top: style.top,
      width: style.width,
      height: style.height,
    };
  }, id);
}

async function serializeBitmapDimensions(page) {
  await page.waitForFunction(() => {
    try {
      const map =
        window.PDFViewerApplication.pdfDocument.annotationStorage.serializable
          .map;
      return !!map;
    } catch {
      return false;
    }
  });

  return page.evaluate(() => {
    const { map } =
      window.PDFViewerApplication.pdfDocument.annotationStorage.serializable;
    return map
      ? Array.from(map.values(), x => {
          return { width: x.bitmap.width, height: x.bitmap.height };
        })
      : [];
  });
}

async function dragAndDropAnnotation(page, startX, startY, tX, tY) {
  await page.mouse.move(startX, startY);
  await page.mouse.down();
  await page.waitForTimeout(10);
  await page.mouse.move(startX + tX, startY + tY);
  await page.mouse.up();
  await page.waitForSelector("#viewer:not(.noUserSelect)");
}

async function waitForAnnotationEditorLayer(page) {
  return page.evaluate(() => {
    return new Promise(resolve => {
      window.PDFViewerApplication.eventBus.on(
        "annotationeditorlayerrendered",
        resolve
      );
    });
  });
}

async function waitForTextLayer(page) {
  return page.evaluate(() => {
    return new Promise(resolve => {
      window.PDFViewerApplication.eventBus.on("textlayerrendered", resolve);
    });
  });
}

async function scrollIntoView(page, selector) {
  await page.evaluate(sel => {
    const element = document.querySelector(sel);
    element.scrollIntoView({ behavior: "instant", block: "start" });
    return new Promise(resolve => {
      document
        .getElementById("viewerContainer")
        .addEventListener("scrollend", resolve, { once: true });
    });
  }, selector);
}

async function hover(page, selector) {
  const rect = await page.$eval(selector, el => {
    const { x, y, width, height } = el.getBoundingClientRect();
    return { x, y, width, height };
  });
  await page.mouse.move(rect.x + rect.width / 2, rect.y + rect.height / 2);
}

const modifier = isMac ? "Meta" : "Control";
async function kbCopy(page) {
  await page.keyboard.down(modifier);
  await page.keyboard.press("c", { commands: ["Copy"] });
  await page.keyboard.up(modifier);
}
async function kbPaste(page) {
  await page.keyboard.down(modifier);
  await page.keyboard.press("v", { commands: ["Paste"] });
  await page.keyboard.up(modifier);
}
async function kbUndo(page) {
  await page.keyboard.down(modifier);
  await page.keyboard.press("z");
  await page.keyboard.up(modifier);
}
async function kbRedo(page) {
  if (isMac) {
    await page.keyboard.down("Meta");
    await page.keyboard.down("Shift");
    await page.keyboard.press("z");
    await page.keyboard.up("Shift");
    await page.keyboard.up("Meta");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("y");
    await page.keyboard.up("Control");
  }
}
async function kbSelectAll(page) {
  await page.keyboard.down(modifier);
  await page.keyboard.press("a", { commands: ["SelectAll"] });
  await page.keyboard.up(modifier);
}
async function kbModifierDown(page) {
  await page.keyboard.down(modifier);
}
async function kbModifierUp(page) {
  await page.keyboard.up(modifier);
}
async function kbGoToEnd(page) {
  if (isMac) {
    await page.keyboard.down("Meta");
    await page.keyboard.press("ArrowDown", {
      commands: ["MoveToEndOfDocument"],
    });
    await page.keyboard.up("Meta");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("End");
    await page.keyboard.up("Control");
  }
}
async function kbGoToBegin(page) {
  if (isMac) {
    await page.keyboard.down("Meta");
    await page.keyboard.press("ArrowUp", {
      commands: ["MoveToBeginningOfDocument"],
    });
    await page.keyboard.up("Meta");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("Home");
    await page.keyboard.up("Control");
  }
}
async function kbBigMoveLeft(page) {
  if (isMac) {
    await page.keyboard.down("Shift");
    await page.keyboard.press("ArrowLeft");
    await page.keyboard.up("Shift");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("ArrowLeft");
    await page.keyboard.up("Control");
  }
}
async function kbBigMoveRight(page) {
  if (isMac) {
    await page.keyboard.down("Shift");
    await page.keyboard.press("ArrowRight");
    await page.keyboard.up("Shift");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("ArrowRight");
    await page.keyboard.up("Control");
  }
}
async function kbBigMoveUp(page) {
  if (isMac) {
    await page.keyboard.down("Shift");
    await page.keyboard.press("ArrowUp");
    await page.keyboard.up("Shift");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("ArrowUp");
    await page.keyboard.up("Control");
  }
}
async function kbBigMoveDown(page) {
  if (isMac) {
    await page.keyboard.down("Shift");
    await page.keyboard.press("ArrowDown");
    await page.keyboard.up("Shift");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("ArrowDown");
    await page.keyboard.up("Control");
  }
}

async function kbDeleteLastWord(page) {
  if (isMac) {
    await page.keyboard.down("Alt");
    await page.keyboard.press("Backspace");
    await page.keyboard.up("Alt");
  } else {
    await page.keyboard.down("Control");
    await page.keyboard.press("Backspace");
    await page.keyboard.up("Control");
  }
}

export {
  clearInput,
  closePages,
  dragAndDropAnnotation,
  getComputedStyleSelector,
  getEditorDimensions,
  getEditors,
  getEditorSelector,
  getFirstSerialized,
  getQuerySelector,
  getSelectedEditors,
  getSelector,
  getSerialized,
  hover,
  kbBigMoveDown,
  kbBigMoveLeft,
  kbBigMoveRight,
  kbBigMoveUp,
  kbCopy,
  kbDeleteLastWord,
  kbGoToBegin,
  kbGoToEnd,
  kbModifierDown,
  kbModifierUp,
  kbPaste,
  kbRedo,
  kbSelectAll,
  kbUndo,
  loadAndWait,
  mockClipboard,
  scrollIntoView,
  serializeBitmapDimensions,
  waitForAnnotationEditorLayer,
  waitForEvent,
  waitForSelectedEditor,
  waitForSerialized,
  waitForStorageEntries,
  waitForTextLayer,
  waitForUnselectedEditor,
};