/*

File: Game.m

Abstract: Abstract superclass. Keeps track of the rules and turns of a game.

Version: 1.0

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*/

#import "Game.h"

#import "Bit.h"

@interface Game ()

@property (copy) NSArray *players;

@property Player *currentPlayer, *winner;

@end

/**  WARNING: THIS CODE REQUIRES GARBAGE COLLECTION!

 **  This sample application uses Objective-C 2.0 garbage collection.

 **  Therefore, the source code in this file does NOT perform manual object memory management.

 **  If you reuse any of this code in a process that isn't garbage collected, you will need to

 **  add all necessary retain/release/autorelease calls, and implement -dealloc methods,

 **  otherwise unpleasant leakage will occur!

 **/

@implementation Game

+ (NSString*) displayName

{

    NSString* name = [self description];

    if( [name hasSuffix: @"Game"] )

        name = [name substringToIndex: name.length-4];

    return name;

}

- (id) initWithBoard: (CALayer*)board

{

    self = [super init];

    if (self != nil) {

        _board = board;

        // Store a pointer to myself as the value of the "Game" property

        // of my root layer. (CALayers can have arbitrary KV properties stored into them.)

        // This is used by the -[CALayer game] category method defined below, to find the Game.

        [board setValue: self forKey: @"Game"];

    }

    return self;

}

@synthesize players=_players, currentPlayer=_currentPlayer, winner=_winner;

- (void) setNumberOfPlayers: (unsigned)n

{

    NSMutableArray *players = [NSMutableArray arrayWithCapacity: n];

    for( int i=1; i<=n; i++ ) {

        Player *player = [[Player alloc] initWithGame: self];

        player.name = [NSString stringWithFormat: @"Player %i",i];

        [players addObject: player];

    }

    self.winner = nil;

    self.currentPlayer = nil;

    self.players = players;

}

- (void) nextPlayer

{

    if( ! _currentPlayer ) {

        NSLog(@"*** The %@ Begins! ***", self.class);

        self.currentPlayer = [_players objectAtIndex: 0];

    } else {

        self.currentPlayer = _currentPlayer.nextPlayer;

    }

    NSLog(@"Current player is %@",_currentPlayer);

}

- (void) endTurn

{

    NSLog(@"--- End of turn");

    Player *winner = [self checkForWinner];

    if( winner ) {

        NSLog(@"*** The %@ Ends! The winner is %@ ! ***", self.class, winner);

        self.winner = winner;

    } else

        [self nextPlayer];

}

#pragma mark -

#pragma mark GAMEPLAY METHODS TO BE OVERRIDDEN:

- (BOOL) canBit: (Bit*)bit moveFrom: (id<BitHolder>)src

{

    return YES;

}

- (BOOL) canBit: (Bit*)bit moveFrom: (id<BitHolder>)src to: (id<BitHolder>)dst

{

    return YES;

}

- (void) bit: (Bit*)bit movedFrom: (id<BitHolder>)src to: (id<BitHolder>)dst

{

    [self endTurn];

}

- (BOOL) clickedBit: (Bit*)bit

{

    return YES;

}

- (Player*) checkForWinner

{

    return nil;

}

@end

@implementation Player

- (id) initWithGame: (Game*)game

{

    self = [super init];

    if (self != nil) {

        _game = game;

    }

    return self;

}

@synthesize game=_game, name=_name;

- (BOOL) isCurrent      {return self == _game.currentPlayer;}

- (BOOL) isFriendly     {return self == _game.currentPlayer;}   // could be overridden for games with partners

- (BOOL) isUnfriendly   {return ! self.friendly;}

- (int) index

{

    return [_game.players indexOfObjectIdenticalTo: self];

}

- (Player*) nextPlayer

{

    return [_game.players objectAtIndex: (self.index+1) % _game.players.count];

}

- (Player*) previousPlayer

{

    return [_game.players objectAtIndex: (self.index-1) % _game.players.count];

}

- (NSString*) description

{

    return [NSString stringWithFormat: @"%@[%@]", self.class,self.name];

}

@end

@implementation CALayer (Game)

- (Game*) game

{

    // The Game object stores a pointer to itself as the value of the "Game" property

    // of its root layer. (CALayers can have arbitrary KV properties stored into them.)

    for( CALayer *layer = self; layer; layer=layer.superlayer ) {

        Game *game = [layer valueForKey: @"Game"];

        if( game )

            return game;

    }

    NSAssert1(NO,@"Couldn't look up Game from %@",self);

    return nil;

}

@end