/*
Copyright 2018-2024 New Vector Ltd.
Copyright 2017 Vector Creations Ltd
Copyright 2015 OpenMarket Ltd

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
 */

#import "MXKContactField.h"

@import MatrixSDK.MXMediaManager;

#import "MXKContactManager.h"

@interface MXKContactField()
{
    // Tell whether we already check the contact avatar definition.
    BOOL shouldCheckAvatarURL;
    // The media manager of the session used to retrieve the contect avatar url
    // This manager is used to download this avatar if need
    MXMediaManager *mediaManager;
    // The current download id
    NSString *downloadId;
}
@end

@implementation MXKContactField

- (void)initFields
{
    // init members
    _contactID = nil;
    _matrixID = nil;
    
    [self resetMatrixAvatar];
}

- (id)initWithContactID:(NSString*)contactID matrixID:(NSString*)matrixID
{
    self = [super init];
    
    if (self)
    {
        [self initFields];
        _contactID = contactID;
        _matrixID = matrixID;
    }
    
    return self;
}

- (void)resetMatrixAvatar
{
    _avatarImage = nil;
    _matrixAvatarURL = nil;
    shouldCheckAvatarURL = YES;
    mediaManager = nil;
    downloadId = nil;
}

- (void)loadAvatarWithSize:(CGSize)avatarSize
{
    // Check whether the avatar image is already set
    if (_avatarImage)
    {
        return;
    }
    
    // Sanity check
    if (_matrixID)
    {
        if (shouldCheckAvatarURL)
        {
            // Consider here all sessions reported into contact manager
            NSArray* mxSessions = [MXKContactManager sharedManager].mxSessions;
            
            if (mxSessions.count)
            {
                // Check whether a matrix user is already known
                MXUser* user;
                MXSession *mxSession;
                
                for (mxSession in mxSessions)
                {
                    user = [mxSession userWithUserId:_matrixID];
                    if (user)
                    {
                        _matrixAvatarURL = user.avatarUrl;
                        if (_matrixAvatarURL)
                        {
                            shouldCheckAvatarURL = NO;
                            mediaManager = mxSession.mediaManager;
                            [self downloadAvatarImage:avatarSize];
                        }
                        break;
                    }
                }
                
                // Trigger a server request if this url has not been found.
                if (shouldCheckAvatarURL)
                {
                    MXWeakify(self);
                    [mxSession.matrixRestClient avatarUrlForUser:_matrixID
                                                         success:^(NSString *mxAvatarUrl) {
                                                             
                                                             MXStrongifyAndReturnIfNil(self);
                                                             self.matrixAvatarURL = mxAvatarUrl;
                                                             self->shouldCheckAvatarURL = NO;
                                                             self->mediaManager = mxSession.mediaManager;
                                                             [self downloadAvatarImage:avatarSize];
                                                             
                                                         } failure:nil];
                }
            }
        }
        else if (_matrixAvatarURL)
        {
            [self downloadAvatarImage:avatarSize];
        }
        // Do nothing if the avatar url has been checked, and it is null.
    }
}

- (void)downloadAvatarImage:(CGSize)avatarSize
{
    // the avatar image is already done
    if (_avatarImage)
    {
        return;
    }
    
    if (_matrixAvatarURL)
    {
        NSString *cacheFilePath = [MXMediaManager thumbnailCachePathForMatrixContentURI:_matrixAvatarURL
                                                                                andType:nil
                                                                               inFolder:kMXMediaManagerAvatarThumbnailFolder
                                                                          toFitViewSize:avatarSize
                                                                             withMethod:MXThumbnailingMethodCrop];
        _avatarImage = [MXMediaManager loadPictureFromFilePath:cacheFilePath];
        
        // the image is already in the cache
        if (_avatarImage)
        {
            MXWeakify(self);
            dispatch_async(dispatch_get_main_queue(), ^{
                MXStrongifyAndReturnIfNil(self);
                [[NSNotificationCenter defaultCenter] postNotificationName:kMXKContactThumbnailUpdateNotification object:self.contactID userInfo:nil];
            });
        }
        else
        {
            NSString *downloadId = [MXMediaManager thumbnailDownloadIdForMatrixContentURI:_matrixAvatarURL inFolder:kMXMediaManagerAvatarThumbnailFolder toFitViewSize:avatarSize withMethod:MXThumbnailingMethodCrop];
            MXMediaLoader* loader = [MXMediaManager existingDownloaderWithIdentifier:downloadId];
            [[NSNotificationCenter defaultCenter] removeObserver:self name:kMXMediaLoaderStateDidChangeNotification object:nil];
            [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onMediaDownloadEnd:) name:kMXMediaLoaderStateDidChangeNotification object:loader];
            if (!loader && mediaManager)
            {
                [mediaManager downloadThumbnailFromMatrixContentURI:_matrixAvatarURL
                                                                     withType:nil
                                                                     inFolder:kMXMediaManagerAvatarThumbnailFolder
                                                                toFitViewSize:avatarSize
                                                                   withMethod:MXThumbnailingMethodCrop
                                                                      success:nil
                                                                      failure:nil];
            }
        }
    }
}

- (void)onMediaDownloadEnd:(NSNotification *)notif
{
    MXMediaLoader *loader = (MXMediaLoader*)notif.object;
    if ([loader.downloadId isEqualToString:downloadId])
    {
        // update the image
        switch (loader.state) {
            case MXMediaLoaderStateDownloadCompleted:
            {
                UIImage *image = [MXMediaManager loadPictureFromFilePath:loader.downloadOutputFilePath];
                if (image)
                {
                    _avatarImage = image;
                    
                    MXWeakify(self);
                    dispatch_async(dispatch_get_main_queue(), ^{
                        MXStrongifyAndReturnIfNil(self);
                        [[NSNotificationCenter defaultCenter] postNotificationName:kMXKContactThumbnailUpdateNotification object:self.contactID userInfo:nil];
                    });
                }
                [[NSNotificationCenter defaultCenter] removeObserver:self name:kMXMediaLoaderStateDidChangeNotification object:nil];
                downloadId = nil;
                break;
            }
            case MXMediaLoaderStateDownloadFailed:
            case MXMediaLoaderStateCancelled:
                [[NSNotificationCenter defaultCenter] removeObserver:self name:kMXMediaLoaderStateDidChangeNotification object:nil];
                downloadId = nil;
                break;
            default:
                break;
        }
    }
}

#pragma mark NSCoding

- (id)initWithCoder:(NSCoder *)coder
{
    if (self)
    {
        [self initFields];
        _contactID = [coder decodeObjectForKey:@"contactID"];
        _matrixID = [coder decodeObjectForKey:@"matrixID"];
    }
    
    return self;
}

- (void)encodeWithCoder:(NSCoder *)coder
{
    [coder encodeObject:_contactID forKey:@"contactID"];
    [coder encodeObject:_matrixID forKey:@"matrixID"];
}

@end