/*
 Copyright 2014 OpenMarket Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

#import "RoomViewController.h"

#import "AppDelegate.h"
#import "RageShakeManager.h"

#import "RoomInputToolbarView.h"

#import "RoomActivitiesView.h"

#import "RoomParticipantsViewController.h"

#import "SegmentedViewController.h"
#import "RoomSettingsViewController.h"

@interface RoomViewController ()
{
    // the user taps on a member thumbnail
    MXRoomMember *selectedRoomMember;

    // List of members who are typing in the room.
    NSArray *currentTypingUsers;
    
    // Typing notifications listener.
    id typingNotifListener;
}

@property (strong, nonatomic) MXKAlert *currentAlert;

@end

@implementation RoomViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // Set room title view
    [self setRoomTitleViewClass:MXKRoomTitleViewWithTopic.class];
    
    // Replace the default input toolbar view.
    [self setRoomInputToolbarViewClass:RoomInputToolbarView.class];
    [self roomInputToolbarView:self.inputToolbarView heightDidChanged:((RoomInputToolbarView*)self.inputToolbarView).mainToolbarHeightConstraint.constant completion:nil];
    
    // set extra area
    [self setRoomActivitiesViewClass:RoomActivitiesView.class];
    
    // Set rageShake handler
    self.rageShakeManager = [RageShakeManager sharedManager];
    
    self.navigationItem.rightBarButtonItem.target = self;
    self.navigationItem.rightBarButtonItem.action = @selector(onButtonPressed:);
    self.navigationItem.rightBarButtonItem.enabled = NO;
    
    // Localize strings here
    
    if (self.roomDataSource)
    {
       // this room view controller has its own typing management.
       self.roomDataSource.showTypingNotifications = NO;
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    [self listenTypingNotifications];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    
    // hide action
    if (self.currentAlert)
    {
        [self.currentAlert dismiss:NO];
        self.currentAlert = nil;
    }
    
    [self removeTypingNotificationsListener];
}

- (void)viewDidAppear:(BOOL)animated
{
    if (self.childViewControllers)
    {
        // Dispose data source defined for room member list view controller (if any)
        for (id childViewController in self.childViewControllers)
        {
            if ([childViewController isKindOfClass:[MXKRoomMemberListViewController class]])
            {
                MXKRoomMemberListViewController *viewController = (MXKRoomMemberListViewController*)childViewController;
                MXKDataSource *dataSource = [viewController dataSource];
                [viewController destroy];
                [dataSource destroy];
            }
        }
    }
    
    [super viewDidAppear:animated];
    
    if (self.roomDataSource)
    {
        // Set visible room id
        [AppDelegate theDelegate].visibleRoomId = self.roomDataSource.roomId;
    }
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
    
    // Reset visible room id
    [AppDelegate theDelegate].visibleRoomId = nil;
}

- (void)viewDidLayoutSubviews
{
    UIEdgeInsets contentInset = self.bubblesTableView.contentInset;
    contentInset.bottom = self.bottomLayoutGuide.length;
    self.bubblesTableView.contentInset = contentInset;
}

#pragma mark - Override MXKRoomViewController

- (void)displayRoom:(MXKRoomDataSource *)dataSource
{
    [super displayRoom:dataSource];
    
    self.navigationItem.rightBarButtonItem.enabled = (dataSource != nil);
}

- (void)updateViewControllerAppearanceOnRoomDataSourceState
{
    [super updateViewControllerAppearanceOnRoomDataSourceState];
    
    self.navigationItem.rightBarButtonItem.enabled = (self.roomDataSource != nil);
}

- (BOOL)isIRCStyleCommand:(NSString*)string
{
    // Override the default behavior for `/join` command in order to open automatically the joined room
    
    if ([string hasPrefix:kCmdJoinRoom])
    {
        // Join a room
        NSString *roomAlias = [string substringFromIndex:kCmdJoinRoom.length + 1];
        // Remove white space from both ends
        roomAlias = [roomAlias stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
        
        // Check
        if (roomAlias.length)
        {
            [self.mainSession joinRoom:roomAlias success:^(MXRoom *room)
             {
                 // Show the room
                 [[AppDelegate theDelegate] showRoom:room.state.roomId withMatrixSession:self.mainSession];
             } failure:^(NSError *error)
             {
                 NSLog(@"[Console RoomVC] Join roomAlias (%@) failed: %@", roomAlias, error);
                 //Alert user
                 [[AppDelegate theDelegate] showErrorAsAlert:error];
             }];
        }
        else
        {
            // Display cmd usage in text input as placeholder
            self.inputToolbarView.placeholder = @"Usage: /join <room_alias>";
        }
        return YES;
    }
    return [super isIRCStyleCommand:string];
}

- (void)destroy
{
    self.navigationItem.rightBarButtonItem.enabled = NO;
    
    if (self.currentAlert)
    {
        [self.currentAlert dismiss:NO];
        self.currentAlert = nil;
    }
    
    [super destroy];
}

#pragma mark - MXKDataSource delegate

- (void)dataSource:(MXKDataSource *)dataSource didRecognizeAction:(NSString *)actionIdentifier inCell:(id<MXKCellRendering>)cell userInfo:(NSDictionary *)userInfo
{
    if ([actionIdentifier isEqualToString:kMXKRoomBubbleCellTapOnMessageTextView])
    {
        self.roomDataSource.showBubblesDateTime = !self.roomDataSource.showBubblesDateTime;
        NSLog(@"    -> Turn %@ cells date", self.roomDataSource.showBubblesDateTime ? @"ON" : @"OFF");
    }
    else
    {
        // Keep default implementation for other actions
        [super dataSource:dataSource didRecognizeAction:actionIdentifier inCell:cell userInfo:userInfo];
    }
}

#pragma mark - Segues

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Keep ref on destinationViewController
    [super prepareForSegue:segue sender:sender];
    
    id pushedViewController = [segue destinationViewController];
    
    if ([[segue identifier] isEqualToString:@"showRoomDetails"])
    {
        if ([pushedViewController isKindOfClass:[SegmentedViewController class]])
        {
            // Dismiss keyboard
            [self dismissKeyboard];
            
            SegmentedViewController* segmentedViewController = (SegmentedViewController*)pushedViewController;
            
            MXSession* session = self.roomDataSource.mxSession;
            NSString* roomid = self.roomDataSource.roomId;
            
            NSMutableArray* viewControllers = [[NSMutableArray alloc] init];
            NSMutableArray* titles = [[NSMutableArray alloc] init];
            
            // members screens
            [titles addObject: NSLocalizedStringFromTable(@"room_details_people", @"Vector", nil)];
            
            RoomParticipantsViewController* participantsViewController = [[RoomParticipantsViewController alloc] init];
            participantsViewController.mxRoom = [session roomWithRoomId:roomid];
            [viewControllers addObject:participantsViewController];
            
            [titles addObject: NSLocalizedStringFromTable(@"room_details_settings", @"Vector", nil)];
            RoomSettingsViewController *settingsViewController = [RoomSettingsViewController roomSettingsViewController];
            [settingsViewController initWithSession:session andRoomId:roomid];
            [viewControllers addObject:settingsViewController];
            
            [segmentedViewController initWithTitles:titles viewControllers:viewControllers defaultSelected:0];
        }
    }
    
    // Hide back button title
    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
}

#pragma mark - MXKRoomInputToolbarViewDelegate

- (void)roomInputToolbarView:(MXKRoomInputToolbarView*)toolbarView placeCallWithVideo:(BOOL)video
{
    [self.mainSession.callManager placeCallInRoom:self.roomDataSource.roomId withVideo:video];
}

#pragma mark - Action

- (IBAction)onButtonPressed:(id)sender
{
    if (sender == self.navigationItem.rightBarButtonItem)
    {
        // FIXME Launch messages search session
    }
}

#pragma mark - UITableView delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [super tableView:tableView didSelectRowAtIndexPath:indexPath];
}

#pragma mark - RoomDetailsViewController management

- (BOOL)roomTitleViewShouldBeginEditing:(MXKRoomTitleView*)titleView
{
    // Instead of editing room title, we open room details view here
    dispatch_async(dispatch_get_main_queue(), ^{
        
        [self performSegueWithIdentifier:@"showRoomDetails" sender:self];
        
    });
    
    return NO;
}

#pragma mark - typing management

- (void)removeTypingNotificationsListener
{
    if (self.roomDataSource)
    {
        // Remove the previous live listener
        if (typingNotifListener)
        {
            [self.roomDataSource.room removeListener:typingNotifListener];
            currentTypingUsers = nil;
        }
    }
}

- (void)listenTypingNotifications
{
    if (self.roomDataSource)
    {
        // Add typing notification listener
        typingNotifListener = [self.roomDataSource.room listenToEventsOfTypes:@[kMXEventTypeStringTypingNotification] onEvent:^(MXEvent *event, MXEventDirection direction, MXRoomState *roomState) {
            
            // Handle only live events
            if (direction == MXEventDirectionForwards)
            {
                // Retrieve typing users list
                NSMutableArray *typingUsers = [NSMutableArray arrayWithArray:self.roomDataSource.room.typingUsers];
                // Remove typing info for the current user
                NSUInteger index = [typingUsers indexOfObject:self.mainSession.myUser.userId];
                if (index != NSNotFound)
                {
                    [typingUsers removeObjectAtIndex:index];
                }
                // Ignore this notification if both arrays are empty
                if (currentTypingUsers.count || typingUsers.count)
                {
                    currentTypingUsers = typingUsers;
                    [self refreshTypingView];
                }
            }
            
        }];
        
        currentTypingUsers = self.roomDataSource.room.typingUsers;
        [self refreshTypingView];
    }
}

- (void)refreshTypingView
{
    NSString* text = nil;
    NSUInteger count = currentTypingUsers.count;
    
    // get the room member names
    NSMutableArray *names = [[NSMutableArray alloc] init];
    
    // keeps the only the first two users
    for(int i = 0; i < MIN(count, 2); i++)
    {
        NSString* name = [currentTypingUsers objectAtIndex:i];
        
        MXRoomMember* member = [self.roomDataSource.room.state memberWithUserId:name];
        
        if (nil != member)
        {
            name = member.displayname;
        }
        
        [names addObject:name];
    }
    
    if (0 == count)
    {
        // something to do ?
    }
    else if (1 == count)
    {
        text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"room_one_user_is_typing", @"Vector", nil), [names objectAtIndex:0]];
    }
    else if (2 == count)
    {
        text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"room_two_users_are_typing", @"Vector", nil), [names objectAtIndex:0], [names objectAtIndex:1]];
    }
    else
    {
        text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"room_many_users_are_typing", @"Vector", nil), [names objectAtIndex:0], [names objectAtIndex:1]];
    }
    
    if (self.activitiesView)
    {
        [((RoomActivitiesView*) self.activitiesView) updateTypingMessage:text];
    }
}

@end