/* 

 * 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