/*
 Copyright 2015 OpenMarket Ltd
 Copyright 2017 Vector Creations Ltd
 Copyright 2018 New Vector 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 "MXKRoomTitleView.h"

#import "MXKConstants.h"

#import "NSBundle+MatrixKit.h"
#import "MXRoom+Sync.h"

#import "MXKSwiftHeader.h"

@interface MXKRoomTitleView ()
{
    // Observer kMXRoomSummaryDidChangeNotification to keep updated the room name.
    __weak id mxRoomSummaryDidChangeObserver;
}
@end

@implementation MXKRoomTitleView
@synthesize inputAccessoryView;

+ (UINib *)nib
{
    return [UINib nibWithNibName:NSStringFromClass([MXKRoomTitleView class])
                          bundle:[NSBundle bundleForClass:[MXKRoomTitleView class]]];
}

- (void)awakeFromNib
{
    [super awakeFromNib];
    
    [self setTranslatesAutoresizingMaskIntoConstraints: NO];
    
    // Add an accessory view to the text view in order to retrieve keyboard view.
    inputAccessoryView = [[UIView alloc] initWithFrame:CGRectZero];
    self.displayNameTextField.inputAccessoryView = inputAccessoryView;
    
    self.displayNameTextField.enabled = NO;
    self.displayNameTextField.returnKeyType = UIReturnKeyDone;
    self.displayNameTextField.hidden = YES;
}

+ (instancetype)roomTitleView
{
    return [[[self class] nib] instantiateWithOwner:nil options:nil].firstObject;
}

- (void)dealloc
{
    inputAccessoryView = nil;
}

#pragma mark - Override MXKView

-(void)customizeViewRendering
{
    [super customizeViewRendering];
    
    self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
}

#pragma mark -

- (void)refreshDisplay
{
    if (_mxRoom)
    {
        // Replace empty string by nil : avoid having the placeholder 'Room name" when there is no displayname
        self.displayNameTextField.text = (_mxRoom.summary.displayname.length) ? _mxRoom.summary.displayname : nil;
    }
    else
    {
        self.displayNameTextField.text = [MatrixKitL10n roomPleaseSelect];
        self.displayNameTextField.enabled = NO;
    }
    self.displayNameTextField.hidden = NO;
}

- (void)destroy
{
    self.delegate = nil;
    self.mxRoom = nil;
    
    if (mxRoomSummaryDidChangeObserver)
    {
        [NSNotificationCenter.defaultCenter removeObserver:mxRoomSummaryDidChangeObserver];
        mxRoomSummaryDidChangeObserver = nil;
    }
}

- (void)dismissKeyboard
{
    // Hide the keyboard
    [self.displayNameTextField resignFirstResponder];
}

#pragma mark -

- (void)setMxRoom:(MXRoom *)mxRoom
{
    // Check whether the room is actually changed
    if (_mxRoom != mxRoom)
    {
        // Remove potential listener
        if (mxRoomSummaryDidChangeObserver)
        {
            [[NSNotificationCenter defaultCenter] removeObserver:mxRoomSummaryDidChangeObserver];
            mxRoomSummaryDidChangeObserver = nil;
        }
        
        if (mxRoom)
        {
            MXWeakify(self);
            
            // Register a listener to handle the room name change
            mxRoomSummaryDidChangeObserver = [[NSNotificationCenter defaultCenter] addObserverForName:kMXRoomSummaryDidChangeNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notif) {
                
                MXStrongifyAndReturnIfNil(self);
                
                // Check whether the text field is editing before refreshing title view
                if (!self.isEditing)
                {
                    [self refreshDisplay];
                }
                
            }];
        }
        _mxRoom = mxRoom;
    }
    // Force refresh
    [self refreshDisplay];
}

- (void)setEditable:(BOOL)editable
{
    self.displayNameTextField.enabled = editable;
}

- (BOOL)isEditing
{
    return self.displayNameTextField.isEditing;
}

#pragma mark - UITextField delegate

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    // check if the deleaget allows the edition
    if (!self.delegate || [self.delegate roomTitleViewShouldBeginEditing:self])
    {
        NSString *alertMsg = nil;
        
        if (textField == self.displayNameTextField)
        {
            // Check whether the user has enough power to rename the room
            MXRoomPowerLevels *powerLevels = _mxRoom.dangerousSyncState.powerLevels;

            NSInteger userPowerLevel = [powerLevels powerLevelOfUserWithUserID:_mxRoom.mxSession.myUser.userId];
            if (userPowerLevel >= [powerLevels minimumPowerLevelForSendingEventAsStateEvent:kMXEventTypeStringRoomName])
            {
                // Only the room name is edited here, update the text field with the room name
                textField.text = _mxRoom.summary.displayname;
                textField.backgroundColor = [UIColor whiteColor];
            }
            else
            {
                alertMsg = [MatrixKitL10n roomErrorNameEditionNotAuthorized];
            }
        }
        
        if (alertMsg)
        {
            // Alert user
            __weak typeof(self) weakSelf = self;
            if (currentAlert)
            {
                [currentAlert dismissViewControllerAnimated:NO completion:nil];
            }
            
            currentAlert = [UIAlertController alertControllerWithTitle:nil message:alertMsg preferredStyle:UIAlertControllerStyleAlert];
            
            [currentAlert addAction:[UIAlertAction actionWithTitle:[MatrixKitL10n cancel]
                                                      style:UIAlertActionStyleDefault
                                                    handler:^(UIAlertAction * action) {
                                                        
                                                        typeof(self) self = weakSelf;
                                                        self->currentAlert = nil;
                                                        
                                                    }]];
            
            [self.delegate roomTitleView:self presentAlertController:currentAlert];
            return NO;
        }
        return YES;
    }
    else
    {
        return NO;
    }
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    if (textField == self.displayNameTextField)
    {
        textField.backgroundColor = [UIColor clearColor];
        
        NSString *roomName = textField.text;
        if ((roomName.length || _mxRoom.summary.displayname.length) && [roomName isEqualToString:_mxRoom.summary.displayname] == NO)
        {
            if ([self.delegate respondsToSelector:@selector(roomTitleView:isSaving:)])
            {
                [self.delegate roomTitleView:self isSaving:YES];
            }
            
            __weak typeof(self) weakSelf = self;
            [_mxRoom setName:roomName success:^{
                
                if (weakSelf)
                {
                    typeof(weakSelf)strongSelf = weakSelf;
                    if ([strongSelf.delegate respondsToSelector:@selector(roomTitleView:isSaving:)])
                    {
                        [strongSelf.delegate roomTitleView:strongSelf isSaving:NO];
                    }
                }
                
            } failure:^(NSError *error) {
                
                if (weakSelf)
                {
                    typeof(weakSelf)strongSelf = weakSelf;
                    if ([strongSelf.delegate respondsToSelector:@selector(roomTitleView:isSaving:)])
                    {
                        [strongSelf.delegate roomTitleView:strongSelf isSaving:NO];
                    }
                    
                    // Revert change
                    textField.text = strongSelf.mxRoom.summary.displayname;
                    MXLogDebug(@"[MXKRoomTitleView] Rename room failed");
                    // Notify MatrixKit user
                    NSString *myUserId = strongSelf.mxRoom.mxSession.myUser.userId;
                    [[NSNotificationCenter defaultCenter] postNotificationName:kMXKErrorNotification object:error userInfo:myUserId ? @{kMXKErrorUserIdKey: myUserId} : nil];
                }
                
            }];
        }
        else
        {
            // No change on room name, restore title with room displayName
            textField.text = _mxRoom.summary.displayname;
        }
    }
}

- (BOOL)textFieldShouldReturn:(UITextField*) textField
{
    // "Done" key has been pressed
    [textField resignFirstResponder];
    return YES;
}

@end