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//
// Copyright (c) 2019 Open Whisper Systems. All rights reserved.
//
#import "ThreadUtil.h"
#import "OWSQuotedReplyModel.h"
#import "OWSUnreadIndicator.h"
#import "TSUnreadIndicatorInteraction.h"
#import <SignalUtilitiesKit/OWSProfileManager.h>
#import <SessionMessagingKit/SSKEnvironment.h>
#import <SessionMessagingKit/OWSBlockingManager.h>
#import <SessionMessagingKit/OWSDisappearingMessagesConfiguration.h>
#import <SessionMessagingKit/TSAccountManager.h>
#import <SessionMessagingKit/TSContactThread.h>
#import <SessionMessagingKit/TSDatabaseView.h>
#import <SessionMessagingKit/TSIncomingMessage.h>
#import <SessionMessagingKit/TSOutgoingMessage.h>
#import <SessionMessagingKit/TSThread.h>
#import <SignalUtilitiesKit/SignalUtilitiesKit-Swift.h>
NS_ASSUME_NONNULL_BEGIN
@interface ThreadDynamicInteractions ()
@property (nonatomic, nullable) NSNumber *focusMessagePosition;
@property (nonatomic, nullable) OWSUnreadIndicator *unreadIndicator;
@end
#pragma mark -
@implementation ThreadDynamicInteractions
- (void)clearUnreadIndicatorState
{
self.unreadIndicator = nil;
}
- (BOOL)isEqual:(id)object
{
if (self == object) {
return YES;
}
if (![object isKindOfClass:[ThreadDynamicInteractions class]]) {
return NO;
}
ThreadDynamicInteractions *other = (ThreadDynamicInteractions *)object;
return ([NSObject isNullableObject:self.focusMessagePosition equalTo:other.focusMessagePosition] &&
[NSObject isNullableObject:self.unreadIndicator equalTo:other.unreadIndicator]);
}
@end
@implementation ThreadUtil
#pragma mark - Dependencies
+ (YapDatabaseConnection *)dbConnection
{
return SSKEnvironment.shared.primaryStorage.dbReadWriteConnection;
}
#pragma mark - Dynamic Interactions
+ (ThreadDynamicInteractions *)ensureDynamicInteractionsForThread:(TSThread *)thread
blockingManager:(OWSBlockingManager *)blockingManager
dbConnection:(YapDatabaseConnection *)dbConnection
hideUnreadMessagesIndicator:(BOOL)hideUnreadMessagesIndicator
lastUnreadIndicator:(nullable OWSUnreadIndicator *)lastUnreadIndicator
focusMessageId:(nullable NSString *)focusMessageId
maxRangeSize:(int)maxRangeSize
{
OWSAssertDebug(thread);
OWSAssertDebug(dbConnection);
OWSAssertDebug(blockingManager);
OWSAssertDebug(maxRangeSize > 0);
ThreadDynamicInteractions *result = [ThreadDynamicInteractions new];
[dbConnection readWithBlock:^(YapDatabaseReadTransaction *transaction) {
// Find any "dynamic" interactions and safety number changes.
//
// We use different views for performance reasons.
NSMutableArray<TSInteraction *> *nonBlockingSafetyNumberChanges = [NSMutableArray new];
[[TSDatabaseView threadSpecialMessagesDatabaseView:transaction]
enumerateKeysAndObjectsInGroup:thread.uniqueId
usingBlock:^(
NSString *collection, NSString *key, id object, NSUInteger index, BOOL *stop) {
if ([object isKindOfClass:[TSErrorMessage class]]) {
TSErrorMessage *errorMessage = (TSErrorMessage *)object;
OWSAssertDebug(
errorMessage.errorType == TSErrorMessageNonBlockingIdentityChange);
[nonBlockingSafetyNumberChanges addObject:errorMessage];
} else {
OWSFailDebug(@"Unexpected dynamic interaction type: %@", [object class]);
}
}];
// Determine if there are "unread" messages in this conversation.
// If we've been passed a firstUnseenInteractionTimestampParameter,
// just use that value in order to preserve continuity of the
// unread messages indicator after all messages in the conversation
// have been marked as read.
//
// IFF this variable is non-null, there are unseen messages in the thread.
NSNumber *_Nullable firstUnseenSortId = nil;
if (lastUnreadIndicator) {
firstUnseenSortId = @(lastUnreadIndicator.firstUnseenSortId);
} else {
TSInteraction *_Nullable firstUnseenInteraction =
[[TSDatabaseView unseenDatabaseViewExtension:transaction] firstObjectInGroup:thread.uniqueId];
if (firstUnseenInteraction && firstUnseenInteraction.sortId != NULL) {
firstUnseenSortId = @(firstUnseenInteraction.sortId);
}
}
[self ensureUnreadIndicator:result
thread:thread
transaction:transaction
maxRangeSize:maxRangeSize
nonBlockingSafetyNumberChanges:nonBlockingSafetyNumberChanges
hideUnreadMessagesIndicator:hideUnreadMessagesIndicator
firstUnseenSortId:firstUnseenSortId];
// Determine the position of the focus message _after_ performing any mutations
// around dynamic interactions.
if (focusMessageId != nil) {
result.focusMessagePosition =
[self focusMessagePositionForThread:thread transaction:transaction focusMessageId:focusMessageId];
}
}];
return result;
}
+ (void)ensureUnreadIndicator:(ThreadDynamicInteractions *)dynamicInteractions
thread:(TSThread *)thread
transaction:(YapDatabaseReadTransaction *)transaction
maxRangeSize:(int)maxRangeSize
nonBlockingSafetyNumberChanges:(NSArray<TSInteraction *> *)nonBlockingSafetyNumberChanges
hideUnreadMessagesIndicator:(BOOL)hideUnreadMessagesIndicator
firstUnseenSortId:(nullable NSNumber *)firstUnseenSortId
{
OWSAssertDebug(dynamicInteractions);
OWSAssertDebug(thread);
OWSAssertDebug(transaction);
OWSAssertDebug(nonBlockingSafetyNumberChanges);
if (hideUnreadMessagesIndicator) {
return;
}
if (!firstUnseenSortId) {
// If there are no unseen interactions, don't show an unread indicator.
return;
}
YapDatabaseViewTransaction *threadMessagesTransaction = [transaction ext:TSMessageDatabaseViewExtensionName];
OWSAssertDebug([threadMessagesTransaction isKindOfClass:[YapDatabaseViewTransaction class]]);
// Determine unread indicator position, if necessary.
//
// Enumerate in reverse to count the number of messages
// after the unseen messages indicator. Not all of
// them are unnecessarily unread, but we need to tell
// the messages view the position of the unread indicator,
// so that it can widen its "load window" to always show
// the unread indicator.
__block long visibleUnseenMessageCount = 0;
__block TSInteraction *interactionAfterUnreadIndicator = nil;
__block BOOL hasMoreUnseenMessages = NO;
[threadMessagesTransaction
enumerateKeysAndObjectsInGroup:thread.uniqueId
withOptions:NSEnumerationReverse
usingBlock:^(NSString *collection, NSString *key, id object, NSUInteger index, BOOL *stop) {
if (![object isKindOfClass:[TSInteraction class]]) {
OWSFailDebug(@"Expected a TSInteraction: %@", [object class]);
return;
}
TSInteraction *interaction = (TSInteraction *)object;
if (interaction.isDynamicInteraction) {
// Ignore dynamic interactions, if any.
return;
}
if (interaction.sortId < firstUnseenSortId.unsignedLongLongValue) {
// By default we want the unread indicator to appear just before
// the first unread message.
*stop = YES;
return;
}
visibleUnseenMessageCount++;
interactionAfterUnreadIndicator = interaction;
if (visibleUnseenMessageCount + 1 >= maxRangeSize) {
// If there are more unseen messages than can be displayed in the
// messages view, show the unread indicator at the top of the
// displayed messages.
*stop = YES;
hasMoreUnseenMessages = YES;
}
}];
if (!interactionAfterUnreadIndicator) {
// If we can't find an interaction after the unread indicator,
// don't show it. All unread messages may have been deleted or
// expired.
return;
}
OWSAssertDebug(visibleUnseenMessageCount > 0);
NSInteger unreadIndicatorPosition = visibleUnseenMessageCount;
dynamicInteractions.unreadIndicator =
[[OWSUnreadIndicator alloc] initWithFirstUnseenSortId:firstUnseenSortId.unsignedLongLongValue
hasMoreUnseenMessages:hasMoreUnseenMessages
missingUnseenSafetyNumberChangeCount:nonBlockingSafetyNumberChanges.count
unreadIndicatorPosition:unreadIndicatorPosition];
OWSLogInfo(@"Creating Unread Indicator: %llu", dynamicInteractions.unreadIndicator.firstUnseenSortId);
}
+ (nullable NSNumber *)focusMessagePositionForThread:(TSThread *)thread
transaction:(YapDatabaseReadTransaction *)transaction
focusMessageId:(NSString *)focusMessageId
{
OWSAssertDebug(thread);
OWSAssertDebug(transaction);
OWSAssertDebug(focusMessageId);
YapDatabaseViewTransaction *databaseView = [transaction ext:TSMessageDatabaseViewExtensionName];
NSString *_Nullable group = nil;
NSUInteger index;
BOOL success =
[databaseView getGroup:&group index:&index forKey:focusMessageId inCollection:TSInteraction.collection];
if (!success) {
// This might happen if the focus message has disappeared
// before this view could appear.
OWSFailDebug(@"failed to find focus message index.");
return nil;
}
if (![group isEqualToString:thread.uniqueId]) {
OWSFailDebug(@"focus message has invalid group.");
return nil;
}
NSUInteger count = [databaseView numberOfItemsInGroup:thread.uniqueId];
if (index >= count) {
OWSFailDebug(@"focus message has invalid index.");
return nil;
}
NSUInteger position = (count - index) - 1;
return @(position);
}
#pragma mark - Delete Content
+ (void)deleteAllContent
{
OWSLogInfo(@"");
[LKStorage writeSyncWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
[self removeAllObjectsInCollection:[TSThread collection]
class:[TSThread class]
transaction:transaction];
[self removeAllObjectsInCollection:[TSInteraction collection]
class:[TSInteraction class]
transaction:transaction];
[self removeAllObjectsInCollection:[TSAttachment collection]
class:[TSAttachment class]
transaction:transaction];
@try {
[self removeAllObjectsInCollection:[SignalRecipient collection]
class:[SignalRecipient class]
transaction:transaction];
} @catch (NSException *exception) {
// Do nothing
}
}];
[TSAttachmentStream deleteAttachments];
}
+ (void)removeAllObjectsInCollection:(NSString *)collection
class:(Class) class
transaction:(YapDatabaseReadWriteTransaction *)transaction {
OWSAssertDebug(collection.length > 0);
OWSAssertDebug(class);
OWSAssertDebug(transaction);
NSArray<NSString *> *_Nullable uniqueIds = [transaction allKeysInCollection:collection];
if (!uniqueIds) {
OWSFailDebug(@"couldn't load uniqueIds for collection: %@.", collection);
return;
}
OWSLogInfo(@"Deleting %lu objects from: %@", (unsigned long)uniqueIds.count, collection);
NSUInteger count = 0;
for (NSString *uniqueId in uniqueIds) {
// We need to fetch each object, since [TSYapDatabaseObject removeWithTransaction:] sometimes does important
// work.
TSYapDatabaseObject *_Nullable object = [class fetchObjectWithUniqueID:uniqueId transaction:transaction];
if (!object) {
OWSFailDebug(@"couldn't load object for deletion: %@.", collection);
continue;
}
[object removeWithTransaction:transaction];
count++;
};
OWSLogInfo(@"Deleted %lu/%lu objects from: %@", (unsigned long)count, (unsigned long)uniqueIds.count, collection);
}
#pragma mark - Find Content
+ (nullable TSInteraction *)findInteractionInThreadByTimestamp:(uint64_t)timestamp
authorId:(NSString *)authorId
threadUniqueId:(NSString *)threadUniqueId
transaction:(YapDatabaseReadTransaction *)transaction
{
OWSAssertDebug(timestamp > 0);
OWSAssertDebug(authorId.length > 0);
NSString *localNumber = [TSAccountManager localNumber];
if (localNumber.length < 1) {
OWSFailDebug(@"missing long number.");
return nil;
}
NSArray<TSInteraction *> *interactions =
[TSInteraction interactionsWithTimestamp:timestamp
filter:^(TSInteraction *interaction) {
NSString *_Nullable messageAuthorId = nil;
if ([interaction isKindOfClass:[TSIncomingMessage class]]) {
TSIncomingMessage *incomingMessage = (TSIncomingMessage *)interaction;
messageAuthorId = incomingMessage.authorId;
} else if ([interaction isKindOfClass:[TSOutgoingMessage class]]) {
messageAuthorId = localNumber;
}
if (messageAuthorId.length < 1) {
return NO;
}
if (![authorId isEqualToString:messageAuthorId]) {
return NO;
}
if (![interaction.uniqueThreadId isEqualToString:threadUniqueId]) {
return NO;
}
return YES;
}
withTransaction:transaction];
if (interactions.count < 1) {
return nil;
}
if (interactions.count > 1) {
// In case of collision, take the first.
OWSLogError(@"more than one matching interaction in thread.");
}
return interactions.firstObject;
}
@end
NS_ASSUME_NONNULL_END