/*

     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: 1.2

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 */ 

#import "Transaction.h"

@implementation Transaction

- (id)init {

    if (self = [super init]) {

        self.date = [NSDate date];

    }

    return self;

}

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

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

    NSArray *stringComponents;

    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:@","];

    for (substring in stringComponents) {

        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]);

            NSDate *readDate;

        NSError *error;

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

        [dateFormatter release];

        self.date = readDate;

        foundDate = YES;

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

        self.amount = substringVal;

        foundAmount = YES;

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

            if (!foundDescription) {

                self.descriptionString = substring;

                foundDescription = YES;

            } else if (!foundType) {

                self.type = substring;

                foundType = YES;

            } else if (!foundAccountType) {

                self.accountType = substring;

                foundAccountType = YES;

            }

        }

    }

    if (!foundDate || !foundAmount) {

        [self release];

        self = nil;

    }

    return self;

}

- (void)dealloc {

    // First, set the "document" property to nil.  Since this is how the undo manager is referenced, setting it to nil will prevent the following from causing spurious undo registrations.  Note that in -dealloc we are manipulating the underying instance variables directly, because invoking setters can cause side-effects, and getters can return copies.

    _document = nil;

    [_date release];

    [_purchaseDate release];

    [_type release];

    [_descriptionString release];

    [_accountType release];

    [super dealloc];

}

- (NSString *)description {

    return [NSString stringWithFormat:@"%@ %f %@", self.date, self.amount, self.descriptionString ? self.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:self.date forKey:kDate];

    [coder encodeDouble:self.amount forKey:kAmount];

    if (self.descriptionString) {

        [coder encodeObject:self.descriptionString forKey:kDescription];

    } 

    if (self.type) {

        [coder encodeObject:self.type forKey:kCategory];

    }

    if (self.accountType) {

        [coder encodeObject:self.accountType forKey:kAccountType];

    }

    if (self.taxable) {

        [coder encodeBool:self.taxable forKey:kTaxable];

    }

    if (self.stockTransaction) {

        [coder encodeBool:YES forKey:kStockTransaction];

        [coder encodeDouble:self.purchasePrice forKey:kPurchasePrice];

        [coder encodeDouble:self.salePrice forKey:kSalePrice];

        [coder encodeDouble:self.numberShares forKey:kNumberShares];

        [coder encodeObject:self.purchaseDate forKey:kPurchaseDate];

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

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

    }

}

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

    self.date = [aDecoder decodeObjectForKey:kDate];

    self.amount = [aDecoder decodeDoubleForKey:kAmount];

    self.descriptionString = [aDecoder decodeObjectForKey:kDescription];

    self.type = [aDecoder decodeObjectForKey:kCategory];

    self.accountType = [aDecoder decodeObjectForKey:kAccountType];

    self.taxable = [aDecoder decodeBoolForKey:kTaxable];

    if ([aDecoder decodeBoolForKey:kStockTransaction]) {

        self.stockTransaction = YES;

        self.purchasePrice = [aDecoder decodeDoubleForKey:kPurchasePrice];

        self.salePrice = [aDecoder decodeDoubleForKey:kSalePrice];

        self.numberShares = [aDecoder decodeDoubleForKey:kNumberShares];

        self.costBasis = [aDecoder decodeDoubleForKey:kCostBasis];

        self.saleAmount = [aDecoder decodeDoubleForKey:kSaleAmount];

        self.purchaseDate = [aDecoder decodeObjectForKey:kPurchaseDate];

    }

    return self;

}

// Accessor Methods

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

@synthesize document = _document;

+ (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)value {

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

    _amount = value;

}

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

    if (_date != value) {

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

        [_date release];

        _date = [value retain];

    }

}

- (NSDate *)date { 

    return [[_date retain] autorelease]; 

}

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

    if (_purchaseDate != value) {

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

        [_purchaseDate release];

        _purchaseDate = [value retain];

    }

}

- (NSDate *)purchaseDate { 

    return [[_purchaseDate retain] autorelease]; 

}

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

    if (_descriptionString != value) {

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

        [_descriptionString release];

        _descriptionString = [value copy];

    }

}

- (NSString *)descriptionString { 

    return [[_descriptionString retain] autorelease]; 

}

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

    if (_type != value) {

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

        [_type release];

        _type = [value copy];

    }

}

- (NSString *)type { 

    return [[_type retain] autorelease]; 

}

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

    if (_accountType != value) {

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

        [_accountType release];

        _accountType = [value copy];

    }

}

- (NSString *)accountType { 

    return [[_accountType retain] autorelease]; 

}

- (void)setTaxable:(BOOL)flag {

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

    _taxable = flag;

}

- (BOOL)taxable { 

    return _taxable; 

}

- (void)setStockTransaction:(BOOL)flag {

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

    _stockTransaction = flag;

}

- (BOOL)stockTransaction { 

    return _stockTransaction; 

}

- (void)setPurchasePrice:(double)value {

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

    _purchasePrice = value;

}

- (double)purchasePrice { 

    return _purchasePrice; 

}

- (void)setSalePrice:(double)value {

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

    _salePrice = value;

}

- (double)salePrice { 

    return _salePrice; 

}

- (void)setNumberShares:(double)value {

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

    _numberShares = value;

}

- (double)numberShares { 

    return _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 self.purchasePrice * self.numberShares;

    }

} 

- (void)setCostBasis:(double)value {

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

    _costBasis = value;

}

// 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 self.salePrice * self.numberShares;

    }

}

- (void)setSaleAmount:(double)value {

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

    _saleAmount = value;

}

- (NSUndoManager *)undoManager {

    return [self.document undoManager];

}

@end