/*
 * Copyright 2019 Google
 *
 * 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 "FirebaseRemoteConfig/Sources/RCNDevice.h"

#import <sys/utsname.h>

#import <GoogleUtilities/GULAppEnvironmentUtil.h>
#import "FirebaseCore/Extension/FirebaseCoreInternal.h"
#import "FirebaseRemoteConfig/Sources/Private/RCNConfigSettings.h"
#import "FirebaseRemoteConfig/Sources/RCNConfigConstants.h"

#define STR(x) STR_EXPAND(x)
#define STR_EXPAND(x) #x

static NSString *const RCNDeviceContextKeyVersion = @"app_version";
static NSString *const RCNDeviceContextKeyBuild = @"app_build";
static NSString *const RCNDeviceContextKeyOSVersion = @"os_version";
static NSString *const RCNDeviceContextKeyDeviceLocale = @"device_locale";
static NSString *const RCNDeviceContextKeyLocaleLanguage = @"locale_language";
static NSString *const RCNDeviceContextKeyGMPProjectIdentifier = @"GMP_project_Identifier";

NSString *FIRRemoteConfigAppVersion() {
  return [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"];
}

NSString *FIRRemoteConfigAppBuildVersion() {
  return [[NSBundle mainBundle] infoDictionary][@"CFBundleVersion"];
}

NSString *FIRRemoteConfigPodVersion() {
  return FIRFirebaseVersion();
}

RCNDeviceModel FIRRemoteConfigDeviceSubtype() {
  NSString *model = [GULAppEnvironmentUtil deviceModel];
  if ([model hasPrefix:@"iPhone"]) {
    return RCNDeviceModelPhone;
  }
  if ([model isEqualToString:@"iPad"]) {
    return RCNDeviceModelTablet;
  }
  return RCNDeviceModelOther;
}

NSString *FIRRemoteConfigDeviceCountry() {
  return [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] lowercaseString];
}

NSDictionary<NSString *, NSArray *> *FIRRemoteConfigFirebaseLocaleMap(void) {
  return @{
    // Albanian
    @"sq" : @[ @"sq_AL" ],
    // Belarusian
    @"be" : @[ @"be_BY" ],
    // Bulgarian
    @"bg" : @[ @"bg_BG" ],
    // Catalan
    @"ca" : @[ @"ca", @"ca_ES" ],
    // Croatian
    @"hr" : @[ @"hr", @"hr_HR" ],
    // Czech
    @"cs" : @[ @"cs", @"cs_CZ" ],
    // Danish
    @"da" : @[ @"da", @"da_DK" ],
    // Estonian
    @"et" : @[ @"et_EE" ],
    // Finnish
    @"fi" : @[ @"fi", @"fi_FI" ],
    // Hebrew
    @"he" : @[ @"he", @"iw_IL" ],
    // Hindi
    @"hi" : @[ @"hi_IN" ],
    // Hungarian
    @"hu" : @[ @"hu", @"hu_HU" ],
    // Icelandic
    @"is" : @[ @"is_IS" ],
    // Indonesian
    @"id" : @[ @"id", @"in_ID", @"id_ID" ],
    // Irish
    @"ga" : @[ @"ga_IE" ],
    // Korean
    @"ko" : @[ @"ko", @"ko_KR", @"ko-KR" ],
    // Latvian
    @"lv" : @[ @"lv_LV" ],
    // Lithuanian
    @"lt" : @[ @"lt_LT" ],
    // Macedonian
    @"mk" : @[ @"mk_MK" ],
    // Malay
    @"ms" : @[ @"ms_MY" ],
    // Maltese
    @"mt" : @[ @"mt_MT" ],
    // Polish
    @"pl" : @[ @"pl", @"pl_PL", @"pl-PL" ],
    // Romanian
    @"ro" : @[ @"ro", @"ro_RO" ],
    // Russian
    @"ru" : @[ @"ru_RU", @"ru", @"ru_BY", @"ru_KZ", @"ru-RU" ],
    // Slovak
    @"sk" : @[ @"sk", @"sk_SK" ],
    // Slovenian
    @"sl" : @[ @"sl_SI" ],
    // Swedish
    @"sv" : @[ @"sv", @"sv_SE", @"sv-SE" ],
    // Turkish
    @"tr" : @[ @"tr", @"tr-TR", @"tr_TR" ],
    // Ukrainian
    @"uk" : @[ @"uk", @"uk_UA" ],
    // Vietnamese
    @"vi" : @[ @"vi", @"vi_VN" ],
    // The following are groups of locales or locales that sub-divide a
    // language).
    // Arabic
    @"ar" : @[
      @"ar",    @"ar_DZ", @"ar_BH", @"ar_EG", @"ar_IQ", @"ar_JO", @"ar_KW",
      @"ar_LB", @"ar_LY", @"ar_MA", @"ar_OM", @"ar_QA", @"ar_SA", @"ar_SD",
      @"ar_SY", @"ar_TN", @"ar_AE", @"ar_YE", @"ar_GB", @"ar-IQ", @"ar_US"
    ],
    // Simplified Chinese
    @"zh_Hans" : @[ @"zh_CN", @"zh_SG", @"zh-Hans" ],
    // Traditional Chinese
    // Remove zh_HK until console added to the list. Otherwise client sends
    // zh_HK and server/console falls back to zh.
    // @"zh_Hant" : @[ @"zh_HK", @"zh_TW", @"zh-Hant", @"zh-HK", @"zh-TW" ],
    @"zh_Hant" : @[ @"zh_TW", @"zh-Hant", @"zh-TW" ],
    // Dutch
    @"nl" : @[ @"nl", @"nl_BE", @"nl_NL", @"nl-NL" ],
    // English
    @"en" : @[
      @"en",    @"en_AU", @"en_CA", @"en_IN", @"en_IE", @"en_MT", @"en_NZ", @"en_PH",
      @"en_SG", @"en_ZA", @"en_GB", @"en_US", @"en_AE", @"en-AE", @"en_AS", @"en-AU",
      @"en_BD", @"en-CA", @"en_EG", @"en_ES", @"en_GB", @"en-GB", @"en_HK", @"en_ID",
      @"en-IN", @"en_NG", @"en-PH", @"en_PK", @"en-SG", @"en-US"
    ],
    // French
    @"fr" :
        @[ @"fr", @"fr_BE", @"fr_CA", @"fr_FR", @"fr_LU", @"fr_CH", @"fr-CA", @"fr-FR", @"fr_MA" ],
    // German
    @"de" : @[ @"de", @"de_AT", @"de_DE", @"de_LU", @"de_CH", @"de-DE" ],
    // Greek
    @"el" : @[ @"el", @"el_CY", @"el_GR" ],
    // Italian
    @"it" : @[ @"it", @"it_IT", @"it_CH", @"it-IT" ],
    // Japanese
    @"ja" : @[ @"ja", @"ja_JP", @"ja_JP_JP", @"ja-JP" ],
    // Norwegian
    @"no" : @[ @"nb", @"no_NO", @"no_NO_NY", @"nb_NO" ],
    // Brazilian Portuguese
    @"pt_BR" : @[ @"pt_BR", @"pt-BR" ],
    // European Portuguese
    @"pt_PT" : @[ @"pt", @"pt_PT", @"pt-PT" ],
    // Serbian
    @"sr" : @[ @"sr_BA", @"sr_ME", @"sr_RS", @"sr_Latn_BA", @"sr_Latn_ME", @"sr_Latn_RS" ],
    // European Spanish
    @"es_ES" : @[ @"es", @"es_ES", @"es-ES" ],
    // Mexican Spanish
    @"es_MX" : @[ @"es-MX", @"es_MX", @"es_US", @"es-US" ],
    // Latin American Spanish
    @"es_419" : @[
      @"es_AR", @"es_BO", @"es_CL", @"es_CO", @"es_CR", @"es_DO", @"es_EC",
      @"es_SV", @"es_GT", @"es_HN", @"es_NI", @"es_PA", @"es_PY", @"es_PE",
      @"es_PR", @"es_UY", @"es_VE", @"es-AR", @"es-CL", @"es-CO"
    ],
    // Thai
    @"th" : @[ @"th", @"th_TH", @"th_TH_TH" ],
  };
}

NSArray<NSString *> *FIRRemoteConfigAppManagerLocales(void) {
  NSMutableArray *locales = [NSMutableArray array];
  NSDictionary<NSString *, NSArray *> *localesMap = FIRRemoteConfigFirebaseLocaleMap();
  for (NSString *key in localesMap) {
    [locales addObjectsFromArray:localesMap[key]];
  }
  return locales;
}
NSString *FIRRemoteConfigDeviceLocale(void) {
  NSArray<NSString *> *locales = FIRRemoteConfigAppManagerLocales();
  NSArray<NSString *> *preferredLocalizations =
      [NSBundle preferredLocalizationsFromArray:locales
                                 forPreferences:[NSLocale preferredLanguages]];
  NSString *legalDocsLanguage = [preferredLocalizations firstObject];
  // Use en as the default language
  return legalDocsLanguage ? legalDocsLanguage : @"en";
}

NSString *FIRRemoteConfigTimezone(void) {
  NSTimeZone *timezone = [NSTimeZone systemTimeZone];
  return timezone.name;
}

NSMutableDictionary *FIRRemoteConfigDeviceContextWithProjectIdentifier(
    NSString *GMPProjectIdentifier) {
  NSMutableDictionary *deviceContext = [[NSMutableDictionary alloc] init];
  deviceContext[RCNDeviceContextKeyVersion] = FIRRemoteConfigAppVersion();
  deviceContext[RCNDeviceContextKeyBuild] = FIRRemoteConfigAppBuildVersion();
  deviceContext[RCNDeviceContextKeyOSVersion] = [GULAppEnvironmentUtil systemVersion];
  deviceContext[RCNDeviceContextKeyDeviceLocale] = FIRRemoteConfigDeviceLocale();
  // NSDictionary setObjectForKey will fail if there's no GMP project ID, must check ahead.
  if (GMPProjectIdentifier) {
    deviceContext[RCNDeviceContextKeyGMPProjectIdentifier] = GMPProjectIdentifier;
  }
  return deviceContext;
}

BOOL FIRRemoteConfigHasDeviceContextChanged(NSDictionary *deviceContext,
                                            NSString *GMPProjectIdentifier) {
  if (![deviceContext[RCNDeviceContextKeyVersion] isEqual:FIRRemoteConfigAppVersion()]) {
    return YES;
  }
  if (![deviceContext[RCNDeviceContextKeyBuild] isEqual:FIRRemoteConfigAppBuildVersion()]) {
    return YES;
  }
  if (![deviceContext[RCNDeviceContextKeyOSVersion]
          isEqual:[GULAppEnvironmentUtil systemVersion]]) {
    return YES;
  }
  if (![deviceContext[RCNDeviceContextKeyDeviceLocale] isEqual:FIRRemoteConfigDeviceLocale()]) {
    return YES;
  }
  // GMP project id is optional.
  if (deviceContext[RCNDeviceContextKeyGMPProjectIdentifier] &&
      ![deviceContext[RCNDeviceContextKeyGMPProjectIdentifier] isEqual:GMPProjectIdentifier]) {
    return YES;
  }
  return NO;
}
