// Copyright (c) 2013 GitHub, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "browser/auto_updater.h"

#import <ReactiveCocoa/RACCommand.h>
#import <ReactiveCocoa/RACSignal.h>
#import <Squirrel/Squirrel.h>

#include "base/bind.h"
#include "base/time/time.h"
#include "base/strings/sys_string_conversions.h"
#include "browser/auto_updater_delegate.h"

namespace auto_updater {

namespace {

// The gloal SQRLUpdater object.
static SQRLUpdater* g_updater = nil;

static void RelaunchToInstallUpdate() {
  if (g_updater != nil)
    [g_updater relaunchToInstallUpdate];
}

}  // namespace

// static
void AutoUpdater::SetFeedURL(const std::string& feed) {
  if (g_updater == nil) {
    // Initialize the SQRLUpdater.
    NSURL* url = [NSURL URLWithString:base::SysUTF8ToNSString(feed)];
    NSURLRequest* urlRequest = [NSURLRequest requestWithURL:url];
    g_updater = [[SQRLUpdater alloc] initWithUpdateRequest:urlRequest];

    AutoUpdaterDelegate* delegate = GetDelegate();
    if (!delegate)
      return;

    // Subscribe to events.
    __block bool has_update = false;
    [g_updater.updates subscribeNext:^(SQRLDownloadedUpdate* downloadedUpdate) {
      has_update = true;

      // There is a new update that has been downloaded.
      SQRLUpdate* update = downloadedUpdate.update;
      delegate->OnUpdateDownloaded(
          base::SysNSStringToUTF8(update.releaseNotes),
          base::SysNSStringToUTF8(update.releaseName),
          base::Time::FromDoubleT(update.releaseDate.timeIntervalSince1970),
          base::SysNSStringToUTF8(update.updateURL.absoluteString),
          base::Bind(RelaunchToInstallUpdate));
    } error:^(NSError* error) {
      // Something wrong happened.
      delegate->OnError(base::SysNSStringToUTF8(error.localizedDescription));
    } completed:^() {
      // When the completed event is sent with no update, then we know there
      // is no update available.
      if (!has_update)
        delegate->OnUpdateNotAvailable();
      has_update = false;
    }];
  }
}

// static
void AutoUpdater::CheckForUpdates() {
  if (g_updater != nil) {
    [g_updater.checkForUpdatesCommand execute:nil];
  }
}

}  // namespace auto_updater