EVPCConversationViewController.h

//
//  EVPCConversationViewController.h
//  EVPcard
//
//  Created by Sebastien Arbogast on 27/02/14.
//  Copyright (c) 2014 Epseelon. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <JSMessagesViewController/JSMessagesViewController.h>
#import <Parse/Parse.h>

@interface EVPCConversationViewController : JSMessagesViewController<JSMessagesViewDelegate, JSMessagesViewDataSource>
@property (nonatomic, strong) PFObject *conversation;
@property (nonatomic, strong) PFUser *recipient;
- (IBAction)cancelButtonTapped:(id)sender;
@end

EVPCConversationViewController.m

//
//  EVPCConversationViewController.m
//  EVPcard
//
//  Created by Sebastien Arbogast on 27/02/14.
//  Copyright (c) 2014 Epseelon. All rights reserved.
//

#import "EVPCConversationViewController.h"
#import <JSMessagesViewController/JSMessage.h>
#import <Parse/Parse.h>

@interface EVPCConversationViewController ()
@property(nonatomic, strong) NSMutableArray *messages;
@end

@implementation EVPCConversationViewController

- (void)viewDidLoad {
    self.delegate = self;
    self.dataSource = self;
    [super viewDidLoad];

    [[JSBubbleView appearance] setFont:[UIFont systemFontOfSize:16.0f]];

    self.title = self.recipient.username;
    self.messageInputView.textView.placeHolder = NSLocalizedString(@"Your message", @"");
    self.sender = [PFUser currentUser].username;
}

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

    if (self.conversation) {
        PFQuery *messageQuery = [PFQuery queryWithClassName:@"EVPCMessage"];
        [messageQuery whereKey:@"conversation" equalTo:self.conversation];
        [messageQuery orderByAscending:@"date"];
        [messageQuery findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
            if (error == nil) {
                self.messages = [[NSMutableArray alloc] initWithCapacity:objects.count];
                for (PFObject *msg in objects) {
                    JSMessage *message = [[JSMessage alloc] initWithText:msg[@"text"] sender:((PFUser *) msg[@"sender"]).username date:msg[@"date"]];
                    [self.messages addObject:message];
                }
                [self.tableView reloadData];
            } else {
                NSLog(@"Error: %@", [error localizedDescription]);
            }
        }];
    } else {
        self.messages = [[NSMutableArray alloc] init];
    }

    [self scrollToBottomAnimated:NO];
    [self.messageInputView.textView becomeFirstResponder];
}


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

#pragma mark - Table view data source

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [self.messages count];
}

#pragma mark - JSMessagesViewDataSource implementation

- (id <JSMessageData>)messageForRowAtIndexPath:(NSIndexPath *)indexPath {
    JSMessage *message = self.messages[(NSUInteger) indexPath.row];
    return message;
}

- (UIImageView *)avatarImageViewForRowAtIndexPath:(NSIndexPath *)indexPath sender:(NSString *)sender {
    return nil;
}

#pragma mark - JSMessagesViewDelegate implementation

- (void)didSendText:(NSString *)text fromSender:(NSString *)sender onDate:(NSDate *)date {
    JSMessage *newMessage = [[JSMessage alloc] initWithText:text sender:[PFUser currentUser].username date:date];
    [self.messages addObject:newMessage];
    [self finishSend];

    /*self.messageInputView.sendButton.enabled = NO;
    if (self.conversation != nil) {
        [self sendMessageWithText:text date:date];
    } else {
        PFObject *conversation = [PFObject objectWithClassName:@"EVPCConversation"];
        conversation[@"sender"] = [PFUser currentUser];
        conversation[@"recipient"] = self.recipient;
        conversation[@"startDate"] = [NSDate date];
        [conversation saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
            if (succeeded) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    self.conversation = conversation;
                    [self sendMessageWithText:text date:date];
                });
            } else {
                self.messageInputView.sendButton.enabled = YES;
                NSLog(@"Error: %@", [error localizedDescription]);
            }
        }];
    }*/
}

- (void)sendMessageWithText:(NSString *)text date:(NSDate *)date {
    PFObject *message = [PFObject objectWithClassName:@"EVPCMessage"];
    message[@"conversation"] = self.conversation;
    message[@"sender"] = [PFUser currentUser];
    message[@"text"] = text;
    message[@"date"] = date;
    [message saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (succeeded) {
            dispatch_async(dispatch_get_main_queue(), ^{
                JSMessage *newMessage = [[JSMessage alloc] initWithText:text sender:[PFUser currentUser].username date:date];
                [self.messages addObject:newMessage];
                [self finishSend];
            });
        } else {
            NSLog(@"Error: %@", [error localizedDescription]);
        }
        self.messageInputView.sendButton.enabled = YES;
    }];
}

- (JSBubbleMessageType)messageTypeForRowAtIndexPath:(NSIndexPath *)indexPath {
    JSMessage *message = self.messages[(NSUInteger) indexPath.row];
    if ([message.sender isEqualToString:[PFUser currentUser].username]) {
        return JSBubbleMessageTypeOutgoing;
    } else {
        return JSBubbleMessageTypeIncoming;
    }
}

- (UIImageView *)bubbleImageViewWithType:(JSBubbleMessageType)type forRowAtIndexPath:(NSIndexPath *)indexPath {
    return nil;
}

- (JSMessageInputViewStyle)inputViewStyle {
    return JSMessageInputViewStyleFlat;
}

- (BOOL)shouldDisplayTimestampForRowAtIndexPath:(NSIndexPath *)indexPath {
    return NO;
}

- (BOOL)shouldPreventScrollToBottomWhileUserScrolling {
    return NO;
}

- (BOOL)allowsPanToDismissKeyboard {
    return YES;
}

/*- (UIButton *)sendButtonForInputView {
    return nil;
}*/

/*- (NSString *)customCellIdentifierForRowAtIndexPath:(NSIndexPath *)indexPath {
    return nil;
}*/

- (IBAction)cancelButtonTapped:(id)sender {
    [self.navigationController dismissViewControllerAnimated:YES completion:nil];
}
@end