/* ChatTableViewController.m
 *
 * Copyright (C) 2012  Belledonne Comunications, Grenoble, France
 *
 *  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 "ChatTableViewController.h"
#import "UIChatCell.h"

#import "linphone/linphonecore.h"
#import "PhoneMainView.h"
#import "UACellBackgroundView.h"
#import "UILinphone.h"
#import "Utils.h"

@implementation ChatTableViewController {
    @private
    MSList* data;
}


#pragma mark - Lifecycle Functions


#pragma mark - ViewController Functions 

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    self.tableView.accessibilityIdentifier = @"ChatRoom list";
    [self loadData];
}


#pragma mark - 

static int sorted_history_comparison(LinphoneChatRoom *to_insert, LinphoneChatRoom *elem){
    LinphoneChatMessage* last_new_message  = linphone_chat_room_get_user_data(to_insert);
    LinphoneChatMessage* last_elem_message = linphone_chat_room_get_user_data(elem);

    if( last_new_message && last_elem_message ){
        time_t new = linphone_chat_message_get_time(last_new_message);
        time_t old = linphone_chat_message_get_time(last_elem_message);
        if ( new < old ) return 1;
        else if ( new > old) return -1;
    }
    return 0;
}

- (MSList*)sortChatRooms {
    MSList* sorted   = nil;
    MSList* unsorted = linphone_core_get_chat_rooms([LinphoneManager getLc]);
    MSList* iter     = unsorted;

    while (iter) {
        // store last message in user data
        MSList*               history = linphone_chat_room_get_history(iter->data, 1);
        LinphoneChatMessage* last_msg = history? history->data : NULL;
        if( last_msg ){
            linphone_chat_room_set_user_data(iter->data, linphone_chat_message_ref(last_msg));
        }
        ms_list_free_with_data(history, (void (*)(void *))linphone_chat_message_unref);

        sorted = ms_list_insert_sorted(sorted,
                                       iter->data,
                                       (MSCompareFunc)sorted_history_comparison);

        iter = iter->next;
    }
    return sorted;
}

static void chatTable_free_chatrooms(void *data){
    LinphoneChatMessage* lastMsg = linphone_chat_room_get_user_data(data);
    if( lastMsg ){
        linphone_chat_message_unref(linphone_chat_room_get_user_data(data));
        linphone_chat_room_set_user_data(data, NULL);
    }
}

- (void)loadData {
    if( data != NULL ){
        ms_list_free_with_data(data, chatTable_free_chatrooms);
    }
    data = [self sortChatRooms];
    [[self tableView] reloadData];
}

#pragma mark - UITableViewDataSource Functions

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return ms_list_size(data);
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *kCellId = @"UIChatCell";
    UIChatCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellId];
    if (cell == nil) {
        cell = [[UIChatCell alloc] initWithIdentifier:kCellId];
        
        // Background View
        UACellBackgroundView *selectedBackgroundView = [[UACellBackgroundView alloc] initWithFrame:CGRectZero];
        cell.selectedBackgroundView = selectedBackgroundView;
        [selectedBackgroundView setBackgroundColor:LINPHONE_TABLE_CELL_BACKGROUND_COLOR];
    }
    
    [cell setChatRoom:(LinphoneChatRoom*)ms_list_nth_data(data, (int)[indexPath row])];
    
    return cell;
}


#pragma mark - UITableViewDelegate Functions

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:NO];
    LinphoneChatRoom *chatRoom = (LinphoneChatRoom*)ms_list_nth_data(data, (int)[indexPath row]);
    
    // Go to ChatRoom view
    ChatRoomViewController *controller = DYNAMIC_CAST([[PhoneMainView instance] changeCurrentView:[ChatRoomViewController compositeViewDescription] push:TRUE], ChatRoomViewController);
    if(controller != nil) {
        [controller setChatRoom:chatRoom];
    }
}

- (UITableViewCellEditingStyle)tableView:(UITableView *)aTableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
    // Detemine if it's in editing mode
    if (self.editing) {
        return UITableViewCellEditingStyleDelete;
    }
    return UITableViewCellEditingStyleNone;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath  {
    if(editingStyle == UITableViewCellEditingStyleDelete) {
        [tableView beginUpdates];

        LinphoneChatRoom *chatRoom = (LinphoneChatRoom*)ms_list_nth_data(data, (int)[indexPath row]);
        linphone_chat_room_delete_history(chatRoom);
        linphone_chat_room_unref(chatRoom);

        // will force a call to [self loadData]
        [[NSNotificationCenter defaultCenter] postNotificationName:kLinphoneTextReceived object:self];

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
        [tableView endUpdates];
    }
}

@end