/*

     File: SandboxedFetchAppDelegate.m

 Abstract: Simple app delegate.

  Version: 1.0

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 */

#import "SandboxedFetchAppDelegate.h"

#import <errno.h>

#import <fcntl.h>

#import "Zipper.h"

#import "Fetcher.h"

@interface SandboxedFetchAppDelegate ()

@property (weak) IBOutlet NSWindow *window;

@property (weak) IBOutlet NSButton *compressCheckbox;

@property (weak) IBOutlet NSButton *fetchButton;

@property (assign) IBOutlet NSTextField *sourceURL;

@property (weak) IBOutlet NSPanel *progressPanel;

@property (weak) IBOutlet NSProgressIndicator *progressIndicator;

@property (weak) IBOutlet NSButton *progressCancelButton;

@property (copy) NSString *progressMessage;

- (IBAction)fetch:(id)sender;

- (IBAction)cancel:(id)sender;

@end

@implementation SandboxedFetchAppDelegate

{

    Zipper *zipper;

    Fetcher *fetcher;

}

#pragma mark Error Alert Sheet

- (void)showErrorAlert:(NSError *)error {

    [[NSAlert alertWithError:error] beginSheetModalForWindow:self.window

                                               modalDelegate:self

                                              didEndSelector:nil

                                                 contextInfo:nil];

}

#pragma mark Progress Panel Sheet

- (void)startProgressPanelWithMessage:(NSString *)message indeterminate:(BOOL)indeterminate {

    // Display a progress panel as a sheet

    self.progressMessage = message;

    if (indeterminate) {

        [self.progressIndicator setIndeterminate:YES];

    } else {

        [self.progressIndicator setIndeterminate:NO];

        [self.progressIndicator setDoubleValue:0.0];

    }

    [self.progressIndicator startAnimation:self];

    [self.progressCancelButton setEnabled:NO];

    [NSApp beginSheet:self.progressPanel

       modalForWindow:self.window

        modalDelegate:self

       didEndSelector:nil

          contextInfo:NULL];

}

- (void)stopProgressPanel {

    [self.progressPanel orderOut:self];

    [NSApp endSheet:self.progressPanel returnCode:0];

}

- (void)setProgress:(double)progress {

    [[NSOperationQueue mainQueue] addOperationWithBlock:^{

        [self.progressIndicator setDoubleValue:progress];

    }];

}

- (IBAction)cancel:(id)sender {

    [self.progressPanel orderOut:self];

    [NSApp endSheet:self.progressPanel returnCode:1];

}

#pragma mark Save Panel Sheet

- (void)saveFile:(NSFileHandle *)fileHandle

{

    NSSavePanel *savePanel = [NSSavePanel savePanel];

    NSString *fileName = [[NSURL URLWithString:[self.sourceURL stringValue]] lastPathComponent];

    if ([self.compressCheckbox state] == NSOffState) {

        [savePanel setNameFieldStringValue:fileName];

    } else {

        [savePanel setNameFieldStringValue:[fileName stringByAppendingPathExtension:@"gz"]];

    }

    [savePanel beginSheetModalForWindow:self.window completionHandler:^(NSInteger result) {

        if (result == NSOKButton) {

            [savePanel orderOut:self];

            NSError *error;

            if ([self.compressCheckbox state] == NSOffState) {

                [self startProgressPanelWithMessage:@"Copying..." indeterminate:YES];

                NSData *fetchedData = [fileHandle availableData];

                BOOL result = [fetchedData writeToURL:[savePanel URL] options:0 error:&error];

                if (!result) {

                    [self showErrorAlert:error];

                }

                [self stopProgressPanel];

                [fileHandle closeFile];

            } else {

                [self startProgressPanelWithMessage:@"Compressing..." indeterminate:YES];

                // Create the file, then create an NSFileHandle to transport it to our zip service.

                if (![[NSData data] writeToURL:[savePanel URL] options:0 error:&error]) {

                    [fileHandle closeFile];

                    [self showErrorAlert:error];

                    return;

                }

                // Create an NSFileHandle for transporting to our zip service. By opening it here, we are able to transfer the ability to write to this file to the service even though it does not have permission to open it on its own.

                NSFileHandle *outFile = [NSFileHandle fileHandleForWritingToURL:[savePanel URL] error:&error];

                if (!outFile) {

                    [fileHandle closeFile];

                    [self showErrorAlert:error];

                    return;

                }

                // Create a connection to the service and send it the message along with our file handles.

                NSXPCConnection *zipServiceConnection = [[NSXPCConnection alloc] initWithServiceName:@"com.apple.SandboxedFetch.zip-service"];

                zipServiceConnection.remoteObjectInterface = [NSXPCInterface interfaceWithProtocol:@protocol(Zip)];

                [zipServiceConnection resume];

                [[zipServiceConnection remoteObjectProxy] compressFile:fileHandle toFile:outFile withReply:^(NSError *error) {

                    [[NSOperationQueue mainQueue] addOperationWithBlock:^{

                        [self stopProgressPanel];

                        if (error) {

                            [self showErrorAlert:error];

                        }

                    }];

                    // At this point we have received a response and we no longer need to keep our connection. If we need another one, we'll just recreate it. We should invalidate the connection so it can finish any appropriate cleanup.

                    [zipServiceConnection invalidate];

                }];

            }

        }

        [fileHandle closeFile];

    }];

}

#pragma mark Actions

- (IBAction)fetch:(id)sender

{

    [[NSUserDefaults standardUserDefaults] setObject:[self.sourceURL stringValue] forKey:@"LastFetchURL"];

    [self startProgressPanelWithMessage:@"Downloading..." indeterminate:NO];

    // Create a connection to our fetch-service and ask it to download for us.

    NSXPCConnection *fetchServiceConnection = [[NSXPCConnection alloc] initWithServiceName:@"com.apple.SandboxedFetch.fetch-service"];

    // The fetch-service will implement the 'Fetch' protocol.

    fetchServiceConnection.remoteObjectInterface = [NSXPCInterface interfaceWithProtocol:@protocol(Fetch)];

    // This object will implement the 'FetchProgress' protocol, so the Fetcher can report progress back and we can display it to the user.

    fetchServiceConnection.exportedInterface = [NSXPCInterface interfaceWithProtocol:@protocol(FetchProgress)];

    fetchServiceConnection.exportedObject = self;

    [fetchServiceConnection resume];

    [[fetchServiceConnection remoteObjectProxy] fetchURL:[NSURL URLWithString:[self.sourceURL stringValue]] withReply:^(NSFileHandle *fileHandle, NSError *error) {

        [[NSOperationQueue mainQueue] addOperationWithBlock:^{

            [self stopProgressPanel];

            if (error) {

                [self showErrorAlert:error];

            } else if ([fileHandle fileDescriptor] == -1) {

                [self showErrorAlert:[NSError errorWithDomain:NSPOSIXErrorDomain code:ENOENT userInfo:nil]];

            } else {

                [self saveFile:fileHandle];

            }

        }];

        // We're done with the connection at this point, so we should invalidate it.

        [fetchServiceConnection invalidate];

    }];

}

#pragma mark Delegate Methods

- (void)applicationWillFinishLaunching:(NSNotification*)aNotification {

    [self addObserver:self forKeyPath:@"sourceURL" options:NSKeyValueObservingOptionNew context: NULL];

}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

    NSString *lastFetchURL = [[NSUserDefaults standardUserDefaults] stringForKey:@"LastFetchURL"];

    if (lastFetchURL) {

        [self.sourceURL setStringValue:lastFetchURL];

    }

}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication {

    return YES;

}

@end