/*

     File: Transaction.m

 Abstract: This class manages the individual transactions in the document.  It uses bindings to show transactions in a master-detail view.

  Version: 1.1

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 */ 

#import "Transaction.h"

@implementation Transaction

- (id)init {

    if (self = [super init]) {

        _date = [[NSDate date] retain];

    }

    return self;

}

- (id)initWithString:(NSString *)string {

    if(!(self = [super init])) return nil;

    NSArray *stringComponents;

    NSEnumerator *enumerator;

    NSString *substring;

    NSScanner *scanner;

    float substringVal;

    BOOL foundDate = NO, foundAmount = NO, foundDescription = NO, foundType = NO, foundAccountType = NO;

    NSCharacterSet *skipSet = [NSCharacterSet characterSetWithCharactersInString:@" \n\t,\""];

    stringComponents = [string componentsSeparatedByString:@"\n"];

    if ([stringComponents count] < 3) stringComponents = [string componentsSeparatedByString:@"\t"];

    if ([stringComponents count] < 3) stringComponents = [string componentsSeparatedByString:@","];

    enumerator = [stringComponents objectEnumerator];

    while (substring = [enumerator nextObject]) {

        substring = [substring stringByTrimmingCharactersInSet:skipSet];

        scanner = [NSScanner scannerWithString:substring];

        [scanner scanFloat:&substringVal];

        if (!foundDate && [substring rangeOfString:@"/"].length != 0) {

            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

            [dateFormatter setDateStyle:NSDateFormatterShortStyle];

            NSRange range = NSMakeRange(0,[substring length]);

            NSError *error;

            [dateFormatter getObjectValue:&_date forString:substring range:&range error:&error];

            [dateFormatter release];

            [_date retain];

            foundDate = YES;

        } else if (!foundAmount && [scanner isAtEnd]) {

            _amount = substringVal;

            foundAmount = YES;

        } else if ([substring length] > 1) {

            if (!foundDescription) {

                _descriptionString = [substring copy];

                foundDescription = YES;

            } else if (!foundType) {

                _type = [substring copy];

                foundType = YES;

            } else if (!foundAccountType) {

                _accountType = [substring copy];

                foundAccountType = YES;

            }

        }

    }

    if (!foundDate || !foundAmount) {

        [self release];

        self = nil;

    }

    return self;

}

- (void)dealloc {

    [_date release];

    [_purchaseDate release];

    [_type release];

    [_descriptionString release];

    [_accountType release];

    [super dealloc];

}

- (NSString *)description {

    return [NSString stringWithFormat:@"%@ %f %@", _date, _amount, _descriptionString ? _descriptionString : @""];

}

#define kDate @"Date"

#define kPurchaseDate @"PurchaseDate"

#define kAmount @"Amount"

#define kDescription @"Description"

#define kCategory @"Category"

#define kAccountType @"AccountType"

#define kTaxable @"Taxable"

#define kStockTransaction @"StockTransaction"

#define kPurchasePrice @"PurchasePrice"

#define kSalePrice @"SalePrice"

#define kNumberShares @"NumberShares"

#define kCostBasis @"CostBasis"

#define kSaleAmount @"SaleAmount"

- (void)encodeWithCoder:(NSCoder *)coder {

    [coder encodeObject:_date forKey:kDate];

    [coder encodeDouble:_amount forKey:kAmount];

    if (_descriptionString) {

        [coder encodeObject:_descriptionString forKey:kDescription];

    } 

    if (_type) {

        [coder encodeObject:_type forKey:kCategory];

    }

    if (_accountType) {

        [coder encodeObject:_accountType forKey:kAccountType];

    }

    if (_taxable) {

        [coder encodeBool:_taxable forKey:kTaxable];

    }

    if (_stockTransaction) {

        [coder encodeBool:YES forKey:kStockTransaction];

        [coder encodeDouble:_purchasePrice forKey:kPurchasePrice];

        [coder encodeDouble:_salePrice forKey:kSalePrice];

        [coder encodeDouble:_numberShares forKey:kNumberShares];

        [coder encodeObject:_purchaseDate forKey:kPurchaseDate];

        if (_costBasis) [coder encodeDouble:_costBasis forKey:kCostBasis];

        if (_saleAmount) [coder encodeDouble:_saleAmount forKey:kSaleAmount];

    }

}

- (id)initWithCoder:(NSCoder *)aDecoder {

    _date = [[aDecoder decodeObjectForKey:kDate] retain];

    _amount = [aDecoder decodeDoubleForKey:kAmount];

    _descriptionString = [[aDecoder decodeObjectForKey:kDescription] copy];

    _type = [[aDecoder decodeObjectForKey:kCategory] copy];

    _accountType = [[aDecoder decodeObjectForKey:kAccountType] copy];

    _taxable = [aDecoder decodeBoolForKey:kTaxable];

    if ([aDecoder decodeBoolForKey:kStockTransaction]) {

        _stockTransaction = YES;

        _purchasePrice = [aDecoder decodeDoubleForKey:kPurchasePrice];

        _salePrice = [aDecoder decodeDoubleForKey:kSalePrice];

        _numberShares = [aDecoder decodeDoubleForKey:kNumberShares];

        _costBasis = [aDecoder decodeDoubleForKey:kCostBasis];

        _saleAmount = [aDecoder decodeDoubleForKey:kSaleAmount];

        _purchaseDate = [[aDecoder decodeObjectForKey:kPurchaseDate] retain];

    }

    return self;

}

// amount is computed from purchasePrice, salePrice, numberShares, costBasis, and saleAmount.  This method is invoked automatically from keyPathsForValuesAffectingValueForKey:@"amount".

+ (NSSet *)keyPathsForValuesAffectingAmount {

    return [NSSet setWithObjects:@"purchasePrice", @"salePrice", @"numberShares", @"costBasis", @"saleAmount", nil];

}

- (double)amount {

    if (_amount == 0 && [self stockTransaction]) {

        return [self saleAmount] - [self costBasis];

    }

    return _amount;

}

- (void)setAmount:(double)amount {

    [[[self undoManager] prepareWithInvocationTarget:self] setAmount:_amount];

    _amount = amount;

}

- (NSDate *)date {

    return [[_date retain] autorelease];

}

- (void)setDate:(NSDate *)date {

    if (_date != date) {

        [[self undoManager] registerUndoWithTarget:self selector:@selector(setDate:) object:_date];

        [_date release];

        _date = [date retain];

    }

}

- (NSDate *)purchaseDate {

    return [[_purchaseDate retain] autorelease];

}

- (void)setPurchaseDate:(NSDate *)purchaseDate {

    if (_purchaseDate != purchaseDate) {

        [[self undoManager] registerUndoWithTarget:self selector:@selector(purchaseDate:) object:_purchaseDate];

        [_purchaseDate release];

        _purchaseDate = [purchaseDate retain];

    }

}

- (NSString *)descriptionString {

    return [[_descriptionString retain] autorelease];

}

- (void)setDescriptionString:(NSString *)description {

    if (description != _descriptionString) {

        [[self undoManager] registerUndoWithTarget:self selector:@selector(setDescriptionString:) object:_descriptionString];

        [_descriptionString release];

        _descriptionString = [description copy];

    }

}

- (NSString *)type {

    return [[_type retain] autorelease];

}

- (void)setType:(NSString *)type {

    if (_type != type) {

        [[self undoManager] registerUndoWithTarget:self selector:@selector(setType:) object:_type];

        [_type release];

        _type = [type copy];

    }

}

- (NSString *)accountType {

    return [[_accountType retain] autorelease];

}

- (void)setAccountType:(NSString *)accountType {

    if (accountType != _accountType) {

        [[self undoManager] registerUndoWithTarget:self selector:@selector(setAccountType:) object:_accountType];

        [_accountType release];

        _accountType = [accountType copy];

    }

}

- (BOOL)taxable {

    return _taxable;

}

- (void)setTaxable:(BOOL)flag {

    [[[self undoManager] prepareWithInvocationTarget:self] setTaxable:_taxable];

   _taxable = flag;

}

- (BOOL)stockTransaction {

    return _stockTransaction;

}

- (void)setStockTransaction:(BOOL)stockTransaction {

    [[[self undoManager] prepareWithInvocationTarget:self] setStockTransaction:_stockTransaction];

    _stockTransaction = stockTransaction;

}

- (double)purchasePrice {

    return _purchasePrice;

}

- (void)setPurchasePrice:(double)purchasePrice {

    [[[self undoManager] prepareWithInvocationTarget:self] setPurchasePrice:_purchasePrice];

   _purchasePrice = purchasePrice;

}

- (double)salePrice {

    return _salePrice;

}

- (void)setSalePrice:(double)salePrice {

    [[[self undoManager] prepareWithInvocationTarget:self] setSalePrice:_salePrice];

   _salePrice = salePrice;

}

- (double)numberShares {

    return _numberShares;

}

- (void)setNumberShares:(double)numberShares {

    [[[self undoManager] prepareWithInvocationTarget:self] setNumberShares:_numberShares];

    _numberShares = numberShares;

}

// costBasis is computed from purchasePrice and numberShares.  This method is invoked automatically from keyPathsForValuesAffectingValueForKey:@"costBasis".

+ (NSSet *)keyPathsForValuesAffectingCostBasis {

    return [NSSet setWithObjects:@"purchasePrice", @"numberShares", nil];

}

- (double)costBasis {

    if (_costBasis != 0) { 

        return _costBasis;

    } else {

        return _purchasePrice * _numberShares;

    }

} 

- (void)setCostBasis:(double)costBasis {

    [[[self undoManager] prepareWithInvocationTarget:self] setCostBasis:_costBasis];

    _costBasis = costBasis;

}

// saleAmount is computed from salePrice and numberShares.  This method is invoked automatically from keyPathsForValuesAffectingValueForKey:@"saleAmount".

+ (NSSet *)keyPathsForValuesAffectingSaleAmount {

    return [NSSet setWithObjects:@"salePrice", @"numberShares", nil];

}

- (double)saleAmount {

    if (_saleAmount != 0) {

        return _saleAmount;

    } else {

        return _salePrice * _numberShares;

    }

}

- (void)setSaleAmount:(double)saleAmount {

    [[[self undoManager] prepareWithInvocationTarget:self] setSaleAmount:_saleAmount];

    _saleAmount = saleAmount;

}

- (void)setDocument:(NSDocument *)document {

    _document = document;       // this is a weak (non-retaining) reference, to avoid a retain cycle

}

- (NSUndoManager *)undoManager {

    return [_document undoManager];

}

@end