//     File: AppDelegate.m

// Abstract: Main application delegate.

//  Version: 1.1

// 

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#import "AppDelegate.h"

#import "Interfaces.h"

#import "NSXPCConnection+LoginItem.h"

@implementation AppDelegate {

    NSMutableString *_text;

    id <Agent> _agent;

}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification

{

    // Initialize string to hold history buffer text.

    _text = [NSMutableString string];

    // Setup our connection to the launch item's service.

    // This will start the launch item if it isn't already running.

    NSError *error = nil;

    NSXPCConnection *connection = [[NSXPCConnection alloc] initWithLoginItemName:@"XYZABC1234.com.example.iDecideHelper.app" error:&error];

    if (connection == nil) {

        [self appendToHistory:@"Failed to connect to login item: %@\n", [error description]];

        [_query setEditable:NO];

        return;

    }

    connection.remoteObjectInterface = [NSXPCInterface interfaceWithProtocol:@protocol(Agent)];

    [connection resume];

    // Get a proxy DecisionAgent object for the connection.

    _agent = [connection remoteObjectProxyWithErrorHandler:^(NSError *err) {

        // This block is run when an error occurs communicating with

        // the launch item service.  This will not be invoked on the

        // main queue, so re-schedule a block on the main queue to

        // update the U.I.

        dispatch_async(dispatch_get_main_queue(), ^{

            [self appendToHistory:@"Failed to query oracle: %@\n\n", [err description]];

        });

    }];

}

- (IBAction)postQuery:(id)sender

{

    // Move the query text into the history buffer.

    NSString *query = [_query stringValue];

    [self appendToHistory:@">>> %@\n", query];

    [_query setStringValue:@""];

    // Query the DecisionAgent for its advice...

    [_agent adviseOn:query reply:^(NSString *advice) {

        // Got advice back from DecisionAgent.  This will not be

        // invoked on the main queue, so re-schedule a block on the

        // main queue to update the U.I.

        dispatch_async(dispatch_get_main_queue(), ^{

            [self appendToHistory:@"%@\n\n", advice];

        });

    }];

}

- (void)appendToHistory:(NSString *)format, ...

{

    va_list ap;

    va_start(ap, format);

    NSString *s = [[NSString alloc] initWithFormat:format arguments:ap];

    [_text appendString:s];

    [_history setString:_text];

    [_history scrollRangeToVisible:NSMakeRange([_text length], 1)];

    va_end(ap);

}

@end