/*

    File:       RemoteCurrencyConverter.h

    Contains:   A model object that manages all networking within the client app.

    Written by: DTS

    Copyright:  Copyright (c) 2011 Apple Inc. All Rights Reserved.

    Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.

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                The Apple Software is provided by Apple on an "AS IS" basis. 

                APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

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*/

#import <Foundation/Foundation.h>

enum RemoteCurrencyConverterStatus {

    kRemoteCurrencyConverterInitialised, 

    kRemoteCurrencyConverterIdle, 

    kRemoteCurrencyConverterConverting, 

    kRemoteCurrencyConverterClosed, 

    kRemoteCurrencyConverterFailed

};

typedef enum RemoteCurrencyConverterStatus RemoteCurrencyConverterStatus;

@interface RemoteCurrencyConverter : NSObject

- (id)initWithNetService:(NSNetService *)netService;

// properties set up by the init method

@property (nonatomic, retain, readonly ) NSNetService *     netService;

// properties that change by themselves

@property (nonatomic, assign, readonly ) RemoteCurrencyConverterStatus  status; // observable

@property (nonatomic, assign, readonly ) BOOL               networkActive;      // observable

// core conversion engine

- (void)startConvertingValue:(double)value fromCurrency:(NSString *)fromCurrency toCurrency:(NSString *)toCurrency;

- (void)stopConverting;

@property (nonatomic, assign, readonly ) BOOL               finished;           // observable

@property (nonatomic, copy,   readonly ) NSNumber *         result;             // observable

// IMPORTANT: result is observable, but it's better to observe finished so that you don't 

// see any intermediate results.

@end