/*
 * Copyright 2017 Discord, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <stdio.h>
#include <sys/stat.h>

#import <AppKit/AppKit.h>

#include "discord_register.h"

static void RegisterCommand(const char *applicationId, const char *command) {

  // There does not appear to be a way to register arbitrary commands on OSX, so instead we'll save the command
  // to a file in the Discord config path, and when it is needed, Discord can try to load the file there, open
  // the command therein (will pass to js's window.open, so requires a url-like thing)

  // Note: will not work for sandboxed apps
  NSString *home = NSHomeDirectory();
  if (!home) {
    return;
  }

  NSString *path = [[[[[[home stringByAppendingPathComponent:@"Library"]
                              stringByAppendingPathComponent:@"Application Support"]
                              stringByAppendingPathComponent:@"discord"]
                              stringByAppendingPathComponent:@"games"]
                              stringByAppendingPathComponent:[NSString stringWithUTF8String:applicationId]]
                              stringByAppendingPathExtension:@"json"];
  [[NSFileManager defaultManager] createDirectoryAtPath:[path stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];

  NSString *jsonBuffer = [NSString stringWithFormat:@"{\"command\": \"%s\"}", command];
  [jsonBuffer writeToFile:path atomically:NO encoding:NSUTF8StringEncoding error:nil];

}

static void RegisterURL(const char *applicationId) {

  char url[256];
  snprintf(url, sizeof(url), "discord-%s", applicationId);
  CFStringRef cfURL = CFStringCreateWithCString(NULL, url, kCFStringEncodingUTF8);

  NSString* myBundleId = [[NSBundle mainBundle] bundleIdentifier];
  if (!myBundleId) {
    fprintf(stderr, "No bundle id found\n");
    return;
  }

  NSURL* myURL = [[NSBundle mainBundle] bundleURL];
  if (!myURL) {
    fprintf(stderr, "No bundle url found\n");
    return;
  }

  OSStatus status = LSSetDefaultHandlerForURLScheme(cfURL, (__bridge CFStringRef)myBundleId);
  if (status != noErr) {
    fprintf(stderr, "Error in LSSetDefaultHandlerForURLScheme: %d\n", (int)status);
    return;
  }

  status = LSRegisterURL((__bridge CFURLRef)myURL, true);
  if (status != noErr) {
    fprintf(stderr, "Error in LSRegisterURL: %d\n", (int)status);
  }

}

void Discord_Register(const QString &applicationId, const char *command) {

  const QByteArray applicationIdData = applicationId.toUtf8();

  if (command) {
    RegisterCommand(applicationIdData.constData(), command);
  }
  else {
    // raii lite
    @autoreleasepool {
      RegisterURL(applicationIdData.constData());
    }
  }

}