/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

/**
 * Tests the DownloadStore object.
 */

"use strict";

// Globals

ChromeUtils.defineModuleGetter(this, "DownloadStore",
                               "resource://gre/modules/DownloadStore.jsm");
ChromeUtils.defineModuleGetter(this, "OS",
                               "resource://gre/modules/osfile.jsm");

/**
 * Returns a new DownloadList object with an associated DownloadStore.
 *
 * @param aStorePath
 *        String pointing to the file to be associated with the DownloadStore,
 *        or undefined to use a non-existing temporary file.  In this case, the
 *        temporary file is deleted when the test file execution finishes.
 *
 * @return {Promise}
 * @resolves Array [ Newly created DownloadList , associated DownloadStore ].
 * @rejects JavaScript exception.
 */
function promiseNewListAndStore(aStorePath) {
  return promiseNewList().then(function(aList) {
    let path = aStorePath || getTempFile(TEST_STORE_FILE_NAME).path;
    let store = new DownloadStore(aList, path);
    return [aList, store];
  });
}

// Tests

/**
 * Saves downloads to a file, then reloads them.
 */
add_task(async function test_save_reload() {
  let [listForSave, storeForSave] = await promiseNewListAndStore();
  let [listForLoad, storeForLoad] = await promiseNewListAndStore(
                                                 storeForSave.path);

  listForSave.add(await promiseNewDownload(httpUrl("source.txt")));
  listForSave.add(await Downloads.createDownload({
    source: { url: httpUrl("empty.txt"),
              referrer: TEST_REFERRER_URL },
    target: getTempFile(TEST_TARGET_FILE_NAME),
  }));

  // This PDF download should not be serialized because it never succeeds.
  let pdfDownload = await Downloads.createDownload({
    source: { url: httpUrl("empty.txt"),
              referrer: TEST_REFERRER_URL },
    target: getTempFile(TEST_TARGET_FILE_NAME),
    saver: "pdf",
  });
  listForSave.add(pdfDownload);

  // If we used a callback to adjust the channel, the download should
  // not be serialized because we can't recreate it across sessions.
  let adjustedDownload = await Downloads.createDownload({
    source: { url: httpUrl("empty.txt"),
              adjustChannel: () => Promise.resolve() },
    target: getTempFile(TEST_TARGET_FILE_NAME),
  });
  listForSave.add(adjustedDownload);

  let legacyDownload = await promiseStartLegacyDownload();
  await legacyDownload.cancel();
  listForSave.add(legacyDownload);

  await storeForSave.save();
  await storeForLoad.load();

  // Remove the PDF and adjusted downloads because they should not appear here.
  listForSave.remove(adjustedDownload);
  listForSave.remove(pdfDownload);

  let itemsForSave = await listForSave.getAll();
  let itemsForLoad = await listForLoad.getAll();

  Assert.equal(itemsForSave.length, itemsForLoad.length);

  // Downloads should be reloaded in the same order.
  for (let i = 0; i < itemsForSave.length; i++) {
    // The reloaded downloads are different objects.
    Assert.notEqual(itemsForSave[i], itemsForLoad[i]);

    // The reloaded downloads have the same properties.
    Assert.equal(itemsForSave[i].source.url,
                 itemsForLoad[i].source.url);
    Assert.equal(itemsForSave[i].source.referrer,
                 itemsForLoad[i].source.referrer);
    Assert.equal(itemsForSave[i].target.path,
                 itemsForLoad[i].target.path);
    Assert.equal(itemsForSave[i].saver.toSerializable(),
                 itemsForLoad[i].saver.toSerializable());
  }
});

/**
 * Checks that saving an empty list deletes any existing file.
 */
add_task(async function test_save_empty() {
  let [, store] = await promiseNewListAndStore();

  let createdFile = await OS.File.open(store.path, { create: true });
  await createdFile.close();

  await store.save();

  Assert.equal(false, await OS.File.exists(store.path));

  // If the file does not exist, saving should not generate exceptions.
  await store.save();
});

/**
 * Checks that loading from a missing file results in an empty list.
 */
add_task(async function test_load_empty() {
  let [list, store] = await promiseNewListAndStore();

  Assert.equal(false, await OS.File.exists(store.path));

  await store.load();

  let items = await list.getAll();
  Assert.equal(items.length, 0);
});

/**
 * Loads downloads from a string in a predefined format.  The purpose of this
 * test is to verify that the JSON format used in previous versions can be
 * loaded, assuming the file is reloaded on the same platform.
 */
add_task(async function test_load_string_predefined() {
  let [list, store] = await promiseNewListAndStore();

  // The platform-dependent file name should be generated dynamically.
  let targetPath = getTempFile(TEST_TARGET_FILE_NAME).path;
  let filePathLiteral = JSON.stringify(targetPath);
  let sourceUriLiteral = JSON.stringify(httpUrl("source.txt"));
  let emptyUriLiteral = JSON.stringify(httpUrl("empty.txt"));
  let referrerUriLiteral = JSON.stringify(TEST_REFERRER_URL);

  let string = "{\"list\":[{\"source\":" + sourceUriLiteral + "," +
                "\"target\":" + filePathLiteral + "}," +
                "{\"source\":{\"url\":" + emptyUriLiteral + "," +
                "\"referrer\":" + referrerUriLiteral + "}," +
                "\"target\":" + filePathLiteral + "}]}";

  await OS.File.writeAtomic(store.path,
                            new TextEncoder().encode(string),
                            { tmpPath: store.path + ".tmp" });

  await store.load();

  let items = await list.getAll();

  Assert.equal(items.length, 2);

  Assert.equal(items[0].source.url, httpUrl("source.txt"));
  Assert.equal(items[0].target.path, targetPath);

  Assert.equal(items[1].source.url, httpUrl("empty.txt"));
  Assert.equal(items[1].source.referrer, TEST_REFERRER_URL);
  Assert.equal(items[1].target.path, targetPath);
});

/**
 * Loads downloads from a well-formed JSON string containing unrecognized data.
 */
add_task(async function test_load_string_unrecognized() {
  let [list, store] = await promiseNewListAndStore();

  // The platform-dependent file name should be generated dynamically.
  let targetPath = getTempFile(TEST_TARGET_FILE_NAME).path;
  let filePathLiteral = JSON.stringify(targetPath);
  let sourceUriLiteral = JSON.stringify(httpUrl("source.txt"));

  let string = "{\"list\":[{\"source\":null," +
                "\"target\":null}," +
                "{\"source\":{\"url\":" + sourceUriLiteral + "}," +
                "\"target\":{\"path\":" + filePathLiteral + "}," +
                "\"saver\":{\"type\":\"copy\"}}]}";

  await OS.File.writeAtomic(store.path,
                            new TextEncoder().encode(string),
                            { tmpPath: store.path + ".tmp" });

  await store.load();

  let items = await list.getAll();

  Assert.equal(items.length, 1);

  Assert.equal(items[0].source.url, httpUrl("source.txt"));
  Assert.equal(items[0].target.path, targetPath);
});

/**
 * Loads downloads from a malformed JSON string.
 */
add_task(async function test_load_string_malformed() {
  let [list, store] = await promiseNewListAndStore();

  let string = "{\"list\":[{\"source\":null,\"target\":null}," +
                "{\"source\":{\"url\":\"about:blank\"}}}";

  await OS.File.writeAtomic(store.path, new TextEncoder().encode(string),
                            { tmpPath: store.path + ".tmp" });

  try {
    await store.load();
    do_throw("Exception expected when JSON data is malformed.");
  } catch (ex) {
    if (ex.name != "SyntaxError") {
      throw ex;
    }
    info("The expected SyntaxError exception was thrown.");
  }

  let items = await list.getAll();

  Assert.equal(items.length, 0);
});

/**
 * Saves downloads with unknown properties to a file and then reloads
 * them to ensure that these properties are preserved.
 */
add_task(async function test_save_reload_unknownProperties() {
  let [listForSave, storeForSave] = await promiseNewListAndStore();
  let [listForLoad, storeForLoad] = await promiseNewListAndStore(
                                                 storeForSave.path);

  let download1 = await promiseNewDownload(httpUrl("source.txt"));
  // startTime should be ignored as it is a known property, and error
  // is ignored by serialization
  download1._unknownProperties = { peanut: "butter",
                                   orange: "marmalade",
                                   startTime: 77,
                                   error: { message: "Passed" } };
  listForSave.add(download1);

  let download2 = await promiseStartLegacyDownload();
  await download2.cancel();
  download2._unknownProperties = { number: 5, object: { test: "string" } };
  listForSave.add(download2);

  let download3 = await Downloads.createDownload({
    source: { url: httpUrl("empty.txt"),
              referrer: TEST_REFERRER_URL,
              source1: "download3source1",
              source2: "download3source2" },
    target: { path: getTempFile(TEST_TARGET_FILE_NAME).path,
              target1: "download3target1",
              target2: "download3target2" },
    saver: { type: "copy",
             saver1: "download3saver1",
             saver2: "download3saver2" },
  });
  listForSave.add(download3);

  await storeForSave.save();
  await storeForLoad.load();

  let itemsForSave = await listForSave.getAll();
  let itemsForLoad = await listForLoad.getAll();

  Assert.equal(itemsForSave.length, itemsForLoad.length);

  Assert.equal(Object.keys(itemsForLoad[0]._unknownProperties).length, 2);
  Assert.equal(itemsForLoad[0]._unknownProperties.peanut, "butter");
  Assert.equal(itemsForLoad[0]._unknownProperties.orange, "marmalade");
  Assert.equal(false, "startTime" in itemsForLoad[0]._unknownProperties);
  Assert.equal(false, "error" in itemsForLoad[0]._unknownProperties);

  Assert.equal(Object.keys(itemsForLoad[1]._unknownProperties).length, 2);
  Assert.equal(itemsForLoad[1]._unknownProperties.number, 5);
  Assert.equal(itemsForLoad[1]._unknownProperties.object.test, "string");

  Assert.equal(Object.keys(itemsForLoad[2].source._unknownProperties).length, 2);
  Assert.equal(itemsForLoad[2].source._unknownProperties.source1,
               "download3source1");
  Assert.equal(itemsForLoad[2].source._unknownProperties.source2,
               "download3source2");

  Assert.equal(Object.keys(itemsForLoad[2].target._unknownProperties).length, 2);
  Assert.equal(itemsForLoad[2].target._unknownProperties.target1,
               "download3target1");
  Assert.equal(itemsForLoad[2].target._unknownProperties.target2,
               "download3target2");

  Assert.equal(Object.keys(itemsForLoad[2].saver._unknownProperties).length, 2);
  Assert.equal(itemsForLoad[2].saver._unknownProperties.saver1,
               "download3saver1");
  Assert.equal(itemsForLoad[2].saver._unknownProperties.saver2,
               "download3saver2");
});