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

"use strict";

function readFile(file) {
  let stream = Cc["@mozilla.org/network/file-input-stream;1"]
               .createInstance(Ci.nsIFileInputStream);
  stream.init(file, -1, -1, Ci.nsIFileInputStream.CLOSE_ON_EOF);

  let sis = Cc["@mozilla.org/scriptableinputstream;1"]
            .createInstance(Ci.nsIScriptableInputStream);
  sis.init(stream);
  let contents = sis.read(file.fileSize);
  sis.close();
  return contents;
}

function checkDirectoryContains(dir, files) {
  print("checking " + dir.path + " - should contain " + Object.keys(files));
  let seen = new Set();
  let enumerator = dir.directoryEntries;
  while (enumerator.hasMoreElements()) {
    let file = enumerator.getNext().QueryInterface(Ci.nsIFile);
    print("found file: " + file.path);
    Assert.ok(file.leafName in files, file.leafName + " exists, but shouldn't");

    let expectedContents = files[file.leafName];
    if (typeof expectedContents != "string") {
      // it's a subdir - recurse!
      Assert.ok(file.isDirectory(), "should be a subdir");
      let newDir = dir.clone();
      newDir.append(file.leafName);
      checkDirectoryContains(newDir, expectedContents);
    } else {
      Assert.ok(!file.isDirectory(), "should be a regular file");
      let contents = readFile(file);
      Assert.equal(contents, expectedContents);
    }
    seen.add(file.leafName);
  }
  let missing = [];
  for (let x in files) {
    if (!seen.has(x)) {
      missing.push(x);
    }
  }
  Assert.deepEqual(missing, [], "no missing files in " + dir.path);
}

function getTestDirs() {
  // we make a directory structure in a temp dir which mirrors what we are
  // testing.
  let tempDir = do_get_tempdir();
  let srcDir = tempDir.clone();
  srcDir.append("test_source_dir");
  srcDir.createUnique(Ci.nsIFile.DIRECTORY_TYPE, FileUtils.PERMS_DIRECTORY);

  let targetDir = tempDir.clone();
  targetDir.append("test_target_dir");
  targetDir.createUnique(Ci.nsIFile.DIRECTORY_TYPE, FileUtils.PERMS_DIRECTORY);

  // no need to cleanup these dirs - the xpcshell harness will do it for us.
  return [srcDir, targetDir];
}

function writeToFile(dir, leafName, contents) {
  let file = dir.clone();
  file.append(leafName);

  let outputStream = FileUtils.openFileOutputStream(file);
  outputStream.write(contents, contents.length);
  outputStream.close();
}

function createSubDir(dir, subDirName) {
  let subDir = dir.clone();
  subDir.append(subDirName);
  subDir.create(Ci.nsIFile.DIRECTORY_TYPE, FileUtils.PERMS_DIRECTORY);
  return subDir;
}

function promiseMigrator(name, srcDir, targetDir) {
  let migrator = Cc["@mozilla.org/profile/migrator;1?app=browser&type=firefox"]
                 .createInstance(Ci.nsISupports)
                 .wrappedJSObject;
  let migrators = migrator._getResourcesInternal(srcDir, targetDir);
  for (let m of migrators) {
    if (m.name == name) {
      return new Promise(resolve => m.migrate(resolve));
    }
  }
  throw new Error("failed to find the " + name + " migrator");
}

function promiseTelemetryMigrator(srcDir, targetDir) {
  return promiseMigrator("telemetry", srcDir, targetDir);
}

add_task(async function test_empty() {
  let [srcDir, targetDir] = getTestDirs();
  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true with empty directories");
  // check both are empty
  checkDirectoryContains(srcDir, {});
  checkDirectoryContains(targetDir, {});
});

add_task(async function test_migrate_files() {
  let [srcDir, targetDir] = getTestDirs();

  // Set up datareporting files, some to copy, some not.
  let stateContent = JSON.stringify({
    clientId: "68d5474e-19dc-45c1-8e9a-81fca592707c",
  });
  let sessionStateContent = "foobar 5432";
  let subDir = createSubDir(srcDir, "datareporting");
  writeToFile(subDir, "state.json", stateContent);
  writeToFile(subDir, "session-state.json", sessionStateContent);
  writeToFile(subDir, "other.file", "do not copy");

  let archived = createSubDir(subDir, "archived");
  writeToFile(archived, "other.file", "do not copy");

  // Set up FHR files, they should not be copied.
  writeToFile(srcDir, "healthreport.sqlite", "do not copy");
  writeToFile(srcDir, "healthreport.sqlite-wal", "do not copy");
  subDir = createSubDir(srcDir, "healthreport");
  writeToFile(subDir, "state.json", "do not copy");
  writeToFile(subDir, "other.file", "do not copy");

  // Perform migration.
  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true with important telemetry files copied");

  checkDirectoryContains(targetDir, {
    "datareporting": {
      "state.json": stateContent,
      "session-state.json": sessionStateContent,
    },
  });
});

add_task(async function test_fallback_fhr_state() {
  let [srcDir, targetDir] = getTestDirs();

  // Test that we fall back to migrating FHR state if the datareporting
  // state file does not exist.
  let stateContent = JSON.stringify({
    clientId: "68d5474e-19dc-45c1-8e9a-81fca592707c",
  });
  let subDir = createSubDir(srcDir, "healthreport");
  writeToFile(subDir, "state.json", stateContent);

  // Perform migration.
  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true");

  checkDirectoryContains(targetDir, {
    "healthreport": {
      "state.json": stateContent,
    },
  });
});


add_task(async function test_datareporting_not_dir() {
  let [srcDir, targetDir] = getTestDirs();

  writeToFile(srcDir, "datareporting", "I'm a file but should be a directory");

  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true even though the directory was a file");

  checkDirectoryContains(targetDir, {});
});

add_task(async function test_datareporting_empty() {
  let [srcDir, targetDir] = getTestDirs();

  // Migrate with an empty 'datareporting' subdir.
  createSubDir(srcDir, "datareporting");
  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true");

  // We should end up with no migrated files.
  checkDirectoryContains(targetDir, {
    "datareporting": {},
  });
});

add_task(async function test_healthreport_empty() {
  let [srcDir, targetDir] = getTestDirs();

  // Migrate with no 'datareporting' and an empty 'healthreport' subdir.
  createSubDir(srcDir, "healthreport");
  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true");

  // We should end up with no migrated files.
  checkDirectoryContains(targetDir, {});
});

add_task(async function test_datareporting_many() {
  let [srcDir, targetDir] = getTestDirs();

  // Create some datareporting files.
  let subDir = createSubDir(srcDir, "datareporting");
  let shouldBeCopied = "should be copied";
  writeToFile(subDir, "state.json", shouldBeCopied);
  writeToFile(subDir, "session-state.json", shouldBeCopied);
  writeToFile(subDir, "something.else", "should not");
  createSubDir(subDir, "emptyDir");

  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true");

  checkDirectoryContains(targetDir, {
    "datareporting": {
      "state.json": shouldBeCopied,
      "session-state.json": shouldBeCopied,
    },
  });
});

add_task(async function test_no_session_state() {
  let [srcDir, targetDir] = getTestDirs();

  // Check that migration still works properly if we only have state.json.
  let subDir = createSubDir(srcDir, "datareporting");
  let stateContent = "abcd984";
  writeToFile(subDir, "state.json", stateContent);

  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true");

  checkDirectoryContains(targetDir, {
    "datareporting": {
      "state.json": stateContent,
    },
  });
});

add_task(async function test_no_state() {
  let [srcDir, targetDir] = getTestDirs();

  // Check that migration still works properly if we only have session-state.json.
  let subDir = createSubDir(srcDir, "datareporting");
  let sessionStateContent = "abcd512";
  writeToFile(subDir, "session-state.json", sessionStateContent);

  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
  Assert.ok(ok, "callback should have been true");

  checkDirectoryContains(targetDir, {
    "datareporting": {
      "session-state.json": sessionStateContent,
    },
  });
});

add_task(async function test_times_migration() {
  let [srcDir, targetDir] = getTestDirs();

  // create a times.json in the source directory.
  let contents = JSON.stringify({created: 1234});
  writeToFile(srcDir, "times.json", contents);

  let earliest = Date.now();
  let ok = await promiseMigrator("times", srcDir, targetDir);
  Assert.ok(ok, "callback should have been true");
  let latest = Date.now();

  let timesFile = targetDir.clone();
  timesFile.append("times.json");

  let raw = readFile(timesFile);
  let times = JSON.parse(raw);
  Assert.ok(times.reset >= earliest && times.reset <= latest);
  // and it should have left the creation time alone.
  Assert.equal(times.created, 1234);
});
