//
//  RNFSManager.m
//  RNFSManager
//
//  Created by Johannes Lumpe on 08/05/15.
//  Copyright (c) 2015 Johannes Lumpe. All rights reserved.
//

#import "RNFSManager.h"
#import "RCTBridge.h"
#import "NSArray+Map.h"
#import "Downloader.h"
#import "RCTEventDispatcher.h"

@interface RNFSManager()

@property (retain) NSMutableDictionary* downloaders;

@end

@implementation RNFSManager

@synthesize bridge = _bridge;

RCT_EXPORT_MODULE();

- (dispatch_queue_t)methodQueue
{
  return dispatch_queue_create("pe.lum.rnfs", DISPATCH_QUEUE_SERIAL);
}

RCT_EXPORT_METHOD(readDir:(NSString *)dirPath
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
  NSFileManager *fileManager = [NSFileManager defaultManager];
  NSError *error = nil;

  NSArray *contents = [fileManager contentsOfDirectoryAtPath:dirPath error:&error];

  contents = [contents rnfs_mapObjectsUsingBlock:^id(NSString *obj, NSUInteger idx) {
    NSString *path = [dirPath stringByAppendingPathComponent:obj];
    NSDictionary *attributes = [fileManager attributesOfItemAtPath:path error:nil];

    return @{
      @"name": obj,
      @"path": path,
      @"size": [attributes objectForKey:NSFileSize],
      @"type": [attributes objectForKey:NSFileType]
    };
  }];

  if (error) {
      return [self reject:reject withError:error];
  }

  resolve(contents);
}

RCT_EXPORT_METHOD(exists:(NSString *)filepath
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(__unused RCTPromiseRejectBlock)reject)
{
  BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:filepath];

  resolve([NSNumber numberWithBool:fileExists]);
}

RCT_EXPORT_METHOD(stat:(NSString *)filepath
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
  NSError *error = nil;
  NSDictionary *attributes = [[NSFileManager defaultManager] attributesOfItemAtPath:filepath error:&error];

  if (error) {
      return [self reject:reject withError:error];
  }

  attributes = @{
    @"ctime": [self dateToTimeIntervalNumber:(NSDate *)[attributes objectForKey:NSFileCreationDate]],
    @"mtime": [self dateToTimeIntervalNumber:(NSDate *)[attributes objectForKey:NSFileModificationDate]],
    @"size": [attributes objectForKey:NSFileSize],
    @"type": [attributes objectForKey:NSFileType],
    @"mode": @([[NSString stringWithFormat:@"%ld", (long)[(NSNumber *)[attributes objectForKey:NSFilePosixPermissions] integerValue]] integerValue])
  };

  resolve(attributes);
}

RCT_EXPORT_METHOD(writeFile:(NSString *)filepath
                  contents:(NSString *)base64Content
                  attributes:(NSDictionary *)attributes
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
  NSData *data = [[NSData alloc] initWithBase64EncodedString:base64Content options:NSDataBase64DecodingIgnoreUnknownCharacters];
  BOOL success = [[NSFileManager defaultManager] createFileAtPath:filepath contents:data attributes:attributes];

  if (!success) {
    return reject([NSString stringWithFormat:@"Could not write file at path %@", filepath], nil, nil);
  }

  resolve([NSNumber numberWithBool:success]);
}

RCT_EXPORT_METHOD(unlink:(NSString*)filepath
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
  NSFileManager *manager = [NSFileManager defaultManager];
  BOOL exists = [manager fileExistsAtPath:filepath isDirectory:false];

  if (!exists) {
      return reject([NSString stringWithFormat:@"File at path %@ does not exist", filepath], nil, nil);
  }
  NSError *error = nil;
  BOOL success = [manager removeItemAtPath:filepath error:&error];

  if (!success) {
      return [self reject:reject withError:error];
  }

  resolve([NSNumber numberWithBool:success]);
}

RCT_EXPORT_METHOD(mkdir:(NSString*)filepath
                  excludeFromBackup:(BOOL)excludeFromBackup
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
  NSFileManager *manager = [NSFileManager defaultManager];

  NSError *error = nil;
  BOOL success = [manager createDirectoryAtPath:filepath withIntermediateDirectories:YES attributes:nil error:&error];

  if (!success) {
    return [self reject:reject withError:error];
  }

  NSURL *url = [NSURL fileURLWithPath:filepath];

  success = [url setResourceValue: [NSNumber numberWithBool: excludeFromBackup] forKey: NSURLIsExcludedFromBackupKey error: &error];

  if (!success) {
    return [self reject:reject withError:error];
  }

  resolve([NSNumber numberWithBool:success]);
}

RCT_EXPORT_METHOD(readFile:(NSString *)filepath
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
  NSData *content = [[NSFileManager defaultManager] contentsAtPath:filepath];
  NSString *base64Content = [content base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];

  if (!base64Content) {
    return reject([NSString stringWithFormat:@"Could not read file at path %@", filepath], nil, nil);
  }

  resolve(base64Content);
}

RCT_EXPORT_METHOD(moveFile:(NSString *)filepath
                  destPath:(NSString *)destPath
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
    NSFileManager *manager = [NSFileManager defaultManager];

    NSError *error = nil;
    BOOL success = [manager moveItemAtPath:filepath toPath:destPath error:&error];

    if (!success) {
      return [self reject:reject withError:error];
    }

    resolve([NSNumber numberWithBool:success]);
}

RCT_EXPORT_METHOD(downloadFile:(NSString *)urlStr
                  filepath:(NSString *)filepath
                  jobId:(nonnull NSNumber *)jobId
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{

  DownloadParams* params = [DownloadParams alloc];

  params.fromUrl = urlStr;
  params.toFile = filepath;

  params.callback = ^(NSNumber* statusCode, NSNumber* bytesWritten) {
    NSMutableDictionary* result = [[NSMutableDictionary alloc] initWithDictionary: @{@"jobId": jobId,
                             @"statusCode": statusCode}];
    if (bytesWritten) {
      [result setObject:bytesWritten forKey: @"bytesWritten"];
    }
    return resolve(result);
  };

  params.errorCallback = ^(NSError* error) {
    return [self reject:reject withError:error];
  };

  params.beginCallback = ^(NSNumber* statusCode, NSNumber* contentLength, NSDictionary* headers) {
    [self.bridge.eventDispatcher sendAppEventWithName:[NSString stringWithFormat:@"DownloadBegin-%@", jobId]
                                                 body:@{@"jobId": jobId,
                                                        @"statusCode": statusCode,
                                                        @"contentLength": contentLength,
                                                        @"headers": headers}];
  };

  params.progressCallback = ^(NSNumber* contentLength, NSNumber* bytesWritten) {
    [self.bridge.eventDispatcher sendAppEventWithName:[NSString stringWithFormat:@"DownloadProgress-%@", jobId]
                                                 body:@{@"jobId": jobId,
                                                        @"contentLength": contentLength,
                                                        @"bytesWritten": bytesWritten}];
  };

  if (!self.downloaders) self.downloaders = [[NSMutableDictionary alloc] init];

  Downloader* downloader = [Downloader alloc];

  [downloader downloadFile:params];

  [self.downloaders setValue:downloader forKey:[jobId stringValue]];
}

RCT_EXPORT_METHOD(stopDownload:(nonnull NSNumber *)jobId)
{
  Downloader* downloader = [self.downloaders objectForKey:[jobId stringValue]];

  if (downloader != nil) {
    [downloader stopDownload];
  }
}

RCT_EXPORT_METHOD(pathForBundle:(NSString *)bundleNamed
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
    NSString *path = [[NSBundle mainBundle].bundlePath stringByAppendingFormat:@"/%@.bundle", bundleNamed];
    NSBundle *bundle = [NSBundle bundleWithPath:path];

    if (!bundle) {
        bundle = [NSBundle bundleForClass:NSClassFromString(bundleNamed)];
        path = bundle.bundlePath;
    }

    if (!bundle.isLoaded) {
        [bundle load];
    }

    if (path) {
        resolve(path);
    } else {
        NSError *error = [NSError errorWithDomain:NSPOSIXErrorDomain
                                             code:NSFileNoSuchFileError
                                         userInfo:nil];

        [self reject:reject withError:error];
    }
}

RCT_EXPORT_METHOD(getFSInfo:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject)
{
    unsigned long long totalSpace = 0;
    unsigned long long totalFreeSpace = 0;

    __autoreleasing NSError *error = nil;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error:&error];

    if (dictionary) {
        NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize];
        NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];
        totalSpace = [fileSystemSizeInBytes unsignedLongLongValue];
        totalFreeSpace = [freeFileSystemSizeInBytes unsignedLongLongValue];

        resolve(@{
          @"totalSpace": [NSNumber numberWithUnsignedLongLong:totalSpace],
          @"freeSpace": [NSNumber numberWithUnsignedLongLong:totalFreeSpace]
        });
    } else {
        [self reject:reject withError:error];
    }
}

- (NSNumber *)dateToTimeIntervalNumber:(NSDate *)date
{
  return @([date timeIntervalSince1970]);
}

- (void)reject:(RCTPromiseRejectBlock)reject withError:(NSError *)error
{
  NSString *codeWithDomain = [NSString stringWithFormat:@"E%@%zd", error.domain.uppercaseString, error.code];
  reject(codeWithDomain, error.localizedDescription, error);
}

- (NSString *)getPathForDirectory:(int)directory
{
  NSArray *paths = NSSearchPathForDirectoriesInDomains(directory, NSUserDomainMask, YES);
  return [paths firstObject];
}

- (NSDictionary *)constantsToExport
{
  return @{
    @"MainBundlePath": [[NSBundle mainBundle] bundlePath],
    @"NSCachesDirectoryPath": [self getPathForDirectory:NSCachesDirectory],
    @"NSDocumentDirectoryPath": [self getPathForDirectory:NSDocumentDirectory],
    @"NSExternalDirectoryPath": [NSNull null],
    @"NSLibraryDirectoryPath": [self getPathForDirectory:NSLibraryDirectory],
    @"NSFileTypeRegular": NSFileTypeRegular,
    @"NSFileTypeDirectory": NSFileTypeDirectory
  };
}

@end