/* 

  * Adium is the legal property of its developers, whose names are listed in the copyright file included

  * with this source distribution.

  * 

  * This program is free software; you can redistribute it and/or modify it under the terms of the GNU

  * General Public License as published by the Free Software Foundation; either version 2 of the License,

  * or (at your option) any later version.

  * 

  * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even

  * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

  * Public License for more details.

  * 

  * You should have received a copy of the GNU General Public License along with this program; if not,

  * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

  */

 #import "OWSpellingPerContactPlugin.h"

 #import <Adium/AIChat.h>

 #import <Adium/AIListContact.h>

 #import <AIUtilities/AIApplicationAdditions.h>

 #import <AIUtilities/AILeopardCompatibility.h>

 #define GROUP_LAST_USED_SPELLING	@"Last Used Spelling"

 #define KEY_LAST_USED_SPELLING		@"Last Used Spelling Languge"

 /*!

  * @class OWSpellingPerContactPlugin

  * @brief Component to save and restore spelling dictionary language preferences on a per-contact basis for chats

  *

  * Language settings on a group chat basis are not currently saved.

  */

 @implementation OWSpellingPerContactPlugin

 /*!

  * @brief Install

  */

 - (void)installPlugin

 {

 	NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];

 	[notificationCenter addObserver:self

 						   selector:@selector(chatBecameActive:)

 							   name:Chat_BecameActive

 							 object:nil];

 	[notificationCenter addObserver:self

 						   selector:@selector(chatWillClose:)

 							   name:Chat_WillClose

 							 object:nil];

 	languageDict = [[NSMutableDictionary alloc] init];

 	//Find the first language the user prefers which the spellchecker knows about, then keep it around for future reference

 	NSArray *preferredLanguages = nil;

 	if ([NSApp isOnSnowLeopardOrBetter]) {

 		preferredLanguages = [[NSSpellChecker sharedSpellChecker] userPreferredLanguages];

 	} else {

 		preferredLanguages = [[NSSpellChecker sharedSpellChecker] availableLanguages];

 	}

 	if (preferredLanguages.count) {

 		preferredLanguage = [preferredLanguages objectAtIndex:0];

 	}

 }

 /*!

  * @brief Uninstall

  */

 - (void)uninstallPlugin

 {

 	[languageDict release]; languageDict = nil;

 	[preferredLanguage release]; preferredLanguage = nil;

 	[[NSNotificationCenter defaultCenter] removeObserver:self];

 }

 /*!

  * @brief A chat became active; set the spelling language preference appropriately

  *

  * If a chat was previously active, as indicated by the PreviouslyActiveChat key in the notification's userInfo,

  * its language preference is stored before switching.

  */

 - (void)chatBecameActive:(NSNotification *)notification

 {

 	@try

 	{

 		AIChat	 *newChat = [notification object];

 		AIChat	 *previousChat = [[notification userInfo] objectForKey:@"PreviouslyActiveChat"];

 		if (previousChat) {

 			NSString *language = [[NSSpellChecker sharedSpellChecker] language];

 			NSString *chatID = [previousChat uniqueChatID];

 			if (language &&

 				![[languageDict objectForKey:chatID] isEqualToString:language]) {

 				//If this chat is not known to be in the current language, store its setting in our languageDict

 				[languageDict setObject:language

 								 forKey:chatID];

 			}

 		}

 		if (newChat) {

 			NSString *chatID = [newChat uniqueChatID];

 			NSString *newChatLanguage = [languageDict objectForKey:chatID];

 			//If we don't have a previously noted language, try to load one from a preference

 			if (!newChatLanguage) {

 				AIListObject *listObject = [newChat listObject];

 				if (listObject) {

 					//Load the preference if possible

 					newChatLanguage = [listObject preferenceForKey:KEY_LAST_USED_SPELLING group:GROUP_LAST_USED_SPELLING];

 				}

 				if (!newChatLanguage) {

 					//If no preference, use the preferred language

 					newChatLanguage = preferredLanguage;

 				}

 				[languageDict setObject:newChatLanguage

 								 forKey:chatID];

 			}

 			[[NSSpellChecker sharedSpellChecker] setLanguage:newChatLanguage];

 		}

 	}

 	@catch(id exc) {}

 }

 /*!

  * @brief Chat will close; save the language preference for its contact before it closes

  */

 - (void)chatWillClose:(NSNotification *)notification

 {

 	AIChat			*chat = [notification object];

 	AIListContact	*listObject = chat.listObject;

 	if (listObject) {

 		NSString	 *chatID = chat.uniqueChatID;

 		NSString	 *chatLanguage = [languageDict objectForKey:chatID];

 		//If we didn't cache a language for this chat, or the chat is currently the active chat, use the spell checker's value.

 		if (!chatLanguage || adium.interfaceController.activeChat == chat)

 			chatLanguage = [[NSSpellChecker sharedSpellChecker] language];

 		//Now, if we end up at the user's default language, we don't want to store anything

 		if ([preferredLanguage isEqualToString:chatLanguage])

 			chatLanguage = nil;

 		NSString *previousLanguage = [listObject preferenceForKey:KEY_LAST_USED_SPELLING group:GROUP_LAST_USED_SPELLING];

 		if ((previousLanguage && ![previousLanguage isEqualToString:chatLanguage]) ||

 			 (!previousLanguage && chatLanguage)) {

 			[listObject setPreference:chatLanguage

 							   forKey:KEY_LAST_USED_SPELLING

 								group:GROUP_LAST_USED_SPELLING];

 		}

 		[languageDict removeObjectForKey:chatID];

 	}

 }

 @end