diff -r 000000000000 -r db7bb080c3d5 Source/Turn.m
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Turn.m	Tue Jul 08 13:12:01 2008 -0700
@@ -0,0 +1,161 @@
+//
+//  Turn.m
+//  YourMove
+//
+//  Created by Jens Alfke on 7/3/08.
+//  Copyright 2008 Jens Alfke. All rights reserved.
+//
+
+#import "Turn.h"
+#import "Game+Protected.h"
+#import "Player.h"
+
+
+NSString* const kTurnCompleteNotification = @"TurnComplete";
+
+
+@interface Turn ()
+@property (copy) NSString *move, *boardState;
+@property (retain) NSDate *date;
+@end
+
+
+
+@implementation Turn
+
+
+- (id) initWithPlayer: (Player*)player
+{
+    NSParameterAssert(player!=nil);
+    self = [super init];
+    if (self != nil) {
+        _game = player.game;
+        _player = player;
+        _status = kTurnEmpty;
+        self.boardState = _game.latestTurn.boardState;
+    }
+    return self;
+}
+
+- (id) initStartOfGame: (Game*)game
+{
+    NSParameterAssert(game!=nil);
+    self = [super init];
+    if (self != nil) {
+        _game = game;
+        _status = kTurnFinished;
+        self.boardState = game.initialStateString;
+        self.date = [NSDate date];
+    }
+    return self;
+}
+
+
+- (id) initWithCoder: (NSCoder*)decoder
+{
+    self = [self init];
+    if( self ) {
+        _game =        [decoder decodeObjectForKey: @"game"];
+        _player =      [decoder decodeObjectForKey: @"player"];
+        _status =      [decoder decodeIntForKey: @"status"];
+        _move =       [[decoder decodeObjectForKey: @"move"] copy];
+        _boardState = [[decoder decodeObjectForKey: @"boardState"] copy];
+        _date =       [[decoder decodeObjectForKey: @"date"] copy];
+        _comment =    [[decoder decodeObjectForKey: @"comment"] copy];
+    }
+    return self;
+}
+
+- (void) encodeWithCoder: (NSCoder*)coder
+{
+    [coder encodeObject: _game       forKey: @"game"];
+    [coder encodeObject: _player     forKey: @"player"];
+    [coder encodeInt:    _status     forKey: @"status"];
+    [coder encodeObject: _move       forKey: @"move"];
+    [coder encodeObject: _boardState forKey: @"boardState"];
+    [coder encodeObject: _date       forKey: @"date"];
+    [coder encodeObject: _comment    forKey: @"comment"];
+}
+
+- (void) dealloc
+{
+    [_move release];
+    [_boardState release];
+    [_date release];
+    [_comment release];
+    [super dealloc];
+}
+
+
+- (NSString*) description
+{
+    return [NSString stringWithFormat: @"%@[%@, #%i, %@]", self.class, _game.class, self.turnNumber, _move];
+}
+
+
+@synthesize game=_game, player=_player, move=_move, boardState=_boardState, date=_date, comment=_comment,
+            replaying=_replaying;
+
+
+- (unsigned) turnNumber     {return [_game.turns indexOfObjectIdenticalTo: self];}
+- (BOOL) isLatestTurn       {return _game.turns.lastObject == self;}
+- (Turn*) previousTurn      {return [_game.turns objectAtIndex: self.turnNumber-1];}
+- (Player*) nextPlayer      {return _player ?_player.nextPlayer :[_game.players objectAtIndex: 0];}
+
+- (TurnStatus) status       {return _status;}
+
+- (void) setStatus: (TurnStatus)status
+{
+    BOOL ok = NO;
+    switch( _status ) {
+        case kTurnEmpty:
+            ok = (status==kTurnPartial) || (status==kTurnComplete);
+            break;
+        case kTurnPartial:
+            ok = (status==kTurnEmpty) || (status==kTurnComplete) || (status==kTurnFinished);
+            break;
+        case kTurnComplete:
+            ok = (status==kTurnEmpty) || (status==kTurnPartial) || (status==kTurnFinished);
+            break;
+        case kTurnFinished:
+            break;
+    }
+    NSAssert2(ok,@"Illegal Turn status transition %i -> %i", _status,status);
+    
+    [self captureBoardState];
+    _status = status;
+    if( _status==kTurnEmpty ) {
+        self.move = nil;
+        self.date = nil;
+    } else
+        self.date = [NSDate date];
+}
+
+
+- (void) addToMove: (NSString*)move
+{
+    if( ! _replaying ) {
+        NSParameterAssert(move.length);
+        NSAssert(_status<kTurnComplete,@"Complete Turn can't be modified");
+        if( _move )
+            move = [_move stringByAppendingString: move];
+        self.move = move;
+        [self captureBoardState];
+        self.date = [NSDate date];
+        if( _status==kTurnEmpty )
+            self.status = kTurnPartial;
+    }
+}
+
+
+- (void) captureBoardState
+{
+    if( ! _replaying ) {
+        NSAssert(_status<kTurnFinished,@"Finished Turn can't be modified");
+        if( _game.board )
+            self.boardState = _game.stateString;
+    }
+}
+
+
+@end