/*
 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 "RoomSettingsViewController.h"

#import "TableViewCellWithLabelAndTextField.h"
#import "TableViewCellWithLabelAndLargeTextView.h"
#import "TableViewCellSeparator.h"

#import "RageShakeManager.h"

#import "VectorDesignValues.h"

#define ROOM_SECTION 0

#define ROOM_SECTION_NAME  0
#define ROOM_SECTION_TOPIC 1
#define ROOM_SECTION_COUNT 2

#define ROOM_TOPIC_CELL_HEIGHT 99

@interface RoomSettingsViewController ()
{
    // updated user data
    NSMutableDictionary<NSString*, id> *updatedItemsDict;
    
    // active items
    UITextView* topicTextView;
    UITextField* nameTextField;
    
    // pending http operation
    MXHTTPOperation* pendingOperation;
    
    // the updating spinner
    UIActivityIndicatorView* updatingSpinner;
    
    MXKAlert *currentAlert;
}
@end

@implementation RoomSettingsViewController

- (UINavigationItem*) getNavigationItem
{
    // this viewController can be displayed
    // 1- with a "standard" push mode
    // 2- within a segmentedViewController i.e. inside another viewcontroller
    // so, we need to use the parent controller when it is required.
    UIViewController* topViewController = (self.parentViewController) ? self.parentViewController : self;
    
    return topViewController.navigationItem;
}

- (void)setNavBarButtons
{
    [self getNavigationItem].rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(onSave:)];
    [self getNavigationItem].rightBarButtonItem.enabled = ([self getUpdatedItemsDict].count != 0);
    [self getNavigationItem].leftBarButtonItem  = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(onCancel:)];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // TODO use a color panel
    // not an hard coded one.
    CGFloat item = (242.0f / 255.0);
    
    self.tableView.backgroundColor = [UIColor colorWithRed:item green:item blue:item alpha:item];
    self.tableView.separatorColor = [UIColor clearColor];
    
    // Setup `RoomSettingsViewController` properties
    self.rageShakeManager = [RageShakeManager sharedManager];
    
    [self setNavBarButtons];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didMXSessionStateChange:) name:kMXSessionStateDidChangeNotification object:nil];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    
    [self dismissFirstResponder];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:kMXSessionStateDidChangeNotification object:nil];
}

// this method is called when the viewcontroller is displayed inside another one.
- (void)didMoveToParentViewController:(nullable UIViewController *)parent
{
    [super didMoveToParentViewController:parent];
    [self setNavBarButtons];
}

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

#pragma mark - private

- (NSMutableDictionary*)getUpdatedItemsDict
{
    if (!updatedItemsDict)
    {
        updatedItemsDict = [[NSMutableDictionary alloc] init];
    }
    
    return updatedItemsDict;
}

- (void)dismissFirstResponder
{
    if ([topicTextView isFirstResponder])
    {
        [topicTextView resignFirstResponder];
    }
    
    if ([nameTextField isFirstResponder])
    {
        [nameTextField resignFirstResponder];
    }
}

- (void)showUpdatingSpinner
{
    self.tableView.userInteractionEnabled = NO;
    
    // Add a spinner
    updatingSpinner  = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    updatingSpinner.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin);
    updatingSpinner.backgroundColor = [UIColor colorWithRed:0.8 green:0.8 blue:0.8 alpha:1.0];
    updatingSpinner.hidesWhenStopped = NO;
    [updatingSpinner startAnimating];
    updatingSpinner.center = self.view.center;
    [self.view addSubview:updatingSpinner];
}

- (void)hideUpdatingSpinner
{
    self.tableView.userInteractionEnabled = YES;
    
    if (updatingSpinner)
    {
        [updatingSpinner removeFromSuperview];
        updatingSpinner = nil;
    }
}

#pragma mark - actions

- (void)textViewDidChange:(UITextView *)textView
{
    // avoid nil pointer
    NSString* text = (textView.text) ? textView.text : @"";
    
    if (topicTextView == textView)
    {
        NSMutableDictionary* dict = [self getUpdatedItemsDict];
        
        if ([text isEqualToString:mxRoomState.topic])
        {
            [dict removeObjectForKey:@"ROOM_SECTION_TOPIC"];
        }
        else
        {
            [dict setObject:text forKey:@"ROOM_SECTION_TOPIC"];
        }
        
        [self getNavigationItem].rightBarButtonItem.enabled = (dict.count != 0);
    }
}

- (IBAction)onTextFieldUpdate:(UITextField*)textField
{
    // avoid nil pointer
    NSString* text = (textField.text) ? textField.text : @"";
    
    if (nameTextField == textField)
    {
        NSMutableDictionary* dict = [self getUpdatedItemsDict];
        
        if ([text isEqualToString:mxRoomState.name])
        {
            [dict removeObjectForKey:@"ROOM_SECTION_NAME"];
        }
        else
        {
            [dict setObject:text forKey:@"ROOM_SECTION_NAME"];
        }
        
        [self getNavigationItem].rightBarButtonItem.enabled = (dict.count != 0);
    }
}

- (void)didMXSessionStateChange:(NSNotification *)notif
{
    // Check this is our Matrix session that has changed
    if (notif.object == self.session)
    {
        // refresh when the session sync is done.
        if (MXSessionStateRunning == self.session.state)
        {
            [self.tableView reloadData];
        }
    }
}

- (IBAction)onCancel:(id)sender
{
    // warn if there is a pending update ?
    [self.navigationController popViewControllerAnimated:YES];
}

- (void)onSaveFailed:(NSString*)message withKey:(NSString*)key
{
    __weak typeof(self) weakSelf = self;
    
    currentAlert = [[MXKAlert alloc] initWithTitle:nil
                                           message:message
                                             style:MXKAlertStyleAlert];
    
    currentAlert.cancelButtonIndex = [currentAlert addActionWithTitle:[NSBundle mxk_localizedStringForKey:@"cancel"]
                                                                style:MXKAlertActionStyleCancel
                                                              handler:^(MXKAlert *alert) {
                                                                  
                                                                  // save anything else
                                                                  __strong __typeof(weakSelf)strongSelf = weakSelf;
                                                                  [strongSelf->updatedItemsDict removeObjectForKey:key];
                                                                  strongSelf->currentAlert = nil;
                                                                  [strongSelf onSave:nil];
                                                                  
                                                              }];
    
    [currentAlert addActionWithTitle:NSLocalizedStringFromTable(@"retry", @"Vector", nil)
                               style:MXKAlertActionStyleDefault
                             handler:^(MXKAlert *alert) {
                                 
                                 // try again
                                 __strong __typeof(weakSelf)strongSelf = weakSelf;
                                 strongSelf->currentAlert = nil;
                                 [strongSelf onSave:nil];
                                 
                             }];
    
    [currentAlert showInViewController:self];
}

- (IBAction)onSave:(id)sender
{
    // check if there is some update
    if (mxRoomState && updatedItemsDict && (updatedItemsDict.count > 0))
    {
        // has a new room name
        if ([updatedItemsDict objectForKey:@"ROOM_SECTION_NAME"])
        {
            NSString* newName = [updatedItemsDict objectForKey:@"ROOM_SECTION_NAME"];
            
            if (![newName isEqualToString:mxRoomState.name])
            {
                [self showUpdatingSpinner];
                __weak typeof(self) weakSelf = self;
                
                pendingOperation = [mxRoom setName:newName success:^{
                    __strong __typeof(weakSelf)strongSelf = weakSelf;
                    
                    strongSelf->pendingOperation = nil;
                    [strongSelf->updatedItemsDict removeObjectForKey:@"ROOM_SECTION_NAME"];
                    [strongSelf onSave:nil];
                    
                } failure:^(NSError *error) {
                    __strong __typeof(weakSelf)strongSelf = weakSelf;
                    
                    strongSelf->pendingOperation = nil;
                    
                    dispatch_async(dispatch_get_main_queue(), ^{
                
                        [strongSelf onSaveFailed:NSLocalizedStringFromTable(@"room_details_fail_to_update_room_name", @"Vector", nil) withKey:@"ROOM_SECTION_NAME"];
                        
                    });
                    
                    NSLog(@"[onDone] Rename room failed: %@", error);
                }];
                
                return;
            }
        }
        
        // has a new room topic
        if ([updatedItemsDict objectForKey:@"ROOM_SECTION_TOPIC"])
        {
            NSString* newTopic = [updatedItemsDict objectForKey:@"ROOM_SECTION_TOPIC"];
            
            if (![newTopic isEqualToString:mxRoomState.topic])
            {
                [self showUpdatingSpinner];
                __weak typeof(self) weakSelf = self;
                
                pendingOperation = [mxRoom setTopic:newTopic success:^{
                    __strong __typeof(weakSelf)strongSelf = weakSelf;
                    
                    strongSelf->pendingOperation = nil;
                    [strongSelf->updatedItemsDict removeObjectForKey:@"ROOM_SECTION_TOPIC"];
                    [strongSelf onSave:nil];
                    
                } failure:^(NSError *error) {
                    __strong __typeof(weakSelf)strongSelf = weakSelf;

                    strongSelf->pendingOperation = nil;
                    
                    dispatch_async(dispatch_get_main_queue(), ^{
                        
                        [strongSelf onSaveFailed:NSLocalizedStringFromTable(@"room_details_fail_to_update_topic", @"Vector", nil) withKey:@"ROOM_SECTION_TOPIC"];
                        
                    });
                    
                    NSLog(@"[onDone] Rename topic failed: %@", error);
                }];
                
                return;
            }
        }
    }
    
    [self hideUpdatingSpinner];
    
    [self.navigationController popViewControllerAnimated:YES];
}

#pragma mark - UITableViewDataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (section == ROOM_SECTION)
    {
        // add separators
        return ROOM_SECTION_COUNT * 2 + 1;
    }
    
    return 0;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 33.0f;
}

- (UITableViewHeaderFooterView *)headerViewForSection:(NSInteger)section
{
    UITableViewHeaderFooterView *header = [[UITableViewHeaderFooterView alloc] initWithFrame:CGRectMake(0, 0, 10, 33)];
    
    header.backgroundColor = [UIColor redColor];
    
    return header;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.section == ROOM_SECTION)
    {
        NSInteger row = indexPath.row;
        
        // is a separator ?
        if ((row % 2) == 0)
        {
            return 1.0f;
        }
        
        // retrieve row as a ROOM_SECTION_XX index
        row = (row - 1) / 2;
        
        if (row == ROOM_SECTION_TOPIC)
        {
            return ROOM_TOPIC_CELL_HEIGHT;
        }
    }
    
    return [super tableView:tableView heightForRowAtIndexPath:indexPath];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger row = indexPath.row;
    UITableViewCell* cell = nil;
    
    // general settings
    if (indexPath.section == ROOM_SECTION)
    {
        if ((row % 2) == 0)
        {
            UITableViewCell* sepCell = [tableView dequeueReusableCellWithIdentifier:[TableViewCellSeparator defaultReuseIdentifier]];
            
            if (!sepCell)
            {
                sepCell = [[TableViewCellSeparator alloc] init];
            }
            
            // the borders are drawn in dark grey
            sepCell.contentView.backgroundColor = ((row == 0) || (row == ROOM_SECTION_COUNT * 2)) ? [UIColor darkGrayColor] : [UIColor lightGrayColor];
            
            return sepCell;
        }
        
        // retrieve row as a ROOM_SECTION_XX index
        row = (row - 1) / 2;
        
        if (row == ROOM_SECTION_TOPIC)
        {
            TableViewCellWithLabelAndLargeTextView *roomTopicCell = [tableView dequeueReusableCellWithIdentifier:[TableViewCellWithLabelAndLargeTextView defaultReuseIdentifier]];
            
            if (!roomTopicCell)
            {
                roomTopicCell = [[TableViewCellWithLabelAndLargeTextView alloc] init];
                
                // define the cell height
                CGRect frame = roomTopicCell.frame;
                frame.size.height = ROOM_TOPIC_CELL_HEIGHT;
                roomTopicCell.frame = frame;
            }
            
            roomTopicCell.mxkLabel.text = NSLocalizedStringFromTable(@"room_details_topic", @"Vector", nil);
            topicTextView = roomTopicCell.mxkTextView;
            
            if (updatedItemsDict && [updatedItemsDict objectForKey:@"ROOM_SECTION_TOPIC"])
            {
                roomTopicCell.mxkTextView.text = (NSString*)[updatedItemsDict objectForKey:@"ROOM_SECTION_TOPIC"];
            }
            else
            {
                roomTopicCell.mxkTextView.text = mxRoomState.topic;
            }
                        
            roomTopicCell.mxkTextView.tintColor = VECTOR_GREEN_COLOR;
            roomTopicCell.mxkTextView.delegate = self;
            
            // disable the edition if the user cannoy update it
            roomTopicCell.mxkTextView.editable = isSuperUser;
            roomTopicCell.mxkTextView.textColor = isSuperUser ? [UIColor blackColor] : [UIColor lightGrayColor];
            
            cell = roomTopicCell;
        }
        else if (row == ROOM_SECTION_NAME)
        {
            TableViewCellWithLabelAndTextField *roomNameCell = [tableView dequeueReusableCellWithIdentifier:[TableViewCellWithLabelAndTextField defaultReuseIdentifier]];
            
            if (!roomNameCell)
            {
                roomNameCell = [[TableViewCellWithLabelAndTextField alloc] init];
            }
            
            roomNameCell.mxkLabel.text = NSLocalizedStringFromTable(@"room_details_room_name", @"Vector", nil);
            roomNameCell.mxkTextField.userInteractionEnabled = YES;
            roomNameCell.mxkTextField.tintColor = VECTOR_GREEN_COLOR;
            
            if (updatedItemsDict && [updatedItemsDict objectForKey:@"ROOM_SECTION_NAME"])
            {
                roomNameCell.mxkTextField.text = (NSString*)[updatedItemsDict objectForKey:@"ROOM_SECTION_NAME"];
            }
            else
            {
                roomNameCell.mxkTextField.text = mxRoomState.name;
            }
            roomNameCell.accessoryType = UITableViewCellAccessoryNone;
            
            cell = roomNameCell;
            nameTextField = roomNameCell.mxkTextField;
            
            // disable the edition if the user cannoy update it
            roomNameCell.editable = isSuperUser;
            roomNameCell.mxkTextField.textColor = isSuperUser ? [UIColor blackColor] : [UIColor lightGrayColor];
            
            
            // Add a "textFieldDidChange" notification method to the text field control.
            [roomNameCell.mxkTextField addTarget:self action:@selector(onTextFieldUpdate:) forControlEvents:UIControlEventEditingChanged];
        }
    }

    return cell;
}

- (void)tableView:(UITableView *)aTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (self.tableView == aTableView)
    {
        [self dismissFirstResponder];
    }
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView == self.tableView)
    {
        [self dismissFirstResponder];
    }
}

@end