//
//  XPMessageDataSourceManager.m
//  YUMI
//
//  Created by YUMI on 2024/12/19.
//

#import "XPMessageDataSourceManager.h"

@interface XPMessageDataSourceManager ()

/// 所有消息（内部可变）
@property (nonatomic, strong) NSMutableArray *allMessages;

/// 聊天消息（内部可变）
@property (nonatomic, strong) NSMutableArray *chatMessages;

/// 礼物消息（内部可变）
@property (nonatomic, strong) NSMutableArray *giftMessages;

/// 数据操作串行队列
@property (nonatomic, strong) dispatch_queue_t dataQueue;

@end

@implementation XPMessageDataSourceManager

#pragma mark - Initialization

- (instancetype)init {
    return [self initWithMaxMessages:1000];
}

- (instancetype)initWithMaxMessages:(NSInteger)maxMessages {
    self = [super init];
    if (self) {
        _allMessages = [NSMutableArray array];
        _chatMessages = [NSMutableArray array];
        _giftMessages = [NSMutableArray array];
        _dataQueue = dispatch_queue_create("com.yumi.message.data", DISPATCH_QUEUE_SERIAL);
        _maxMessages = maxMessages;
    }
    return self;
}

#pragma mark - Public Methods

- (void)addMessage:(XPMessageItem *)message {
    if (!message) return;
    
    dispatch_async(self.dataQueue, ^{
        NSMutableArray *allMessages = (NSMutableArray *)_allMessages;
        NSMutableArray *chatMessages = (NSMutableArray *)_chatMessages;
        NSMutableArray *giftMessages = (NSMutableArray *)_giftMessages;
        
        [allMessages addObject:message];
        
        // 根据消息类型分发到对应的子数据源
        if ([message isChatMessage]) {
            [chatMessages addObject:message];
        }
        if ([message isGiftMessage]) {
            [giftMessages addObject:message];
        }
        
        // 检查是否需要清理
        if (allMessages.count > self.maxMessages) {
            [self cleanupOldMessages];
        }
    });
}

// 同步写入版本，确保调用返回时数据已落入数组（适合随后立刻刷新快照的场景）
- (void)addMessageSync:(XPMessageItem *)message {
    if (!message) return;
    
    dispatch_sync(self.dataQueue, ^{
        NSMutableArray *allMessages = (NSMutableArray *)_allMessages;
        NSMutableArray *chatMessages = (NSMutableArray *)_chatMessages;
        NSMutableArray *giftMessages = (NSMutableArray *)_giftMessages;
        
        [allMessages addObject:message];
        if ([message isChatMessage]) {
            [chatMessages addObject:message];
        }
        if ([message isGiftMessage]) {
            [giftMessages addObject:message];
        }
        if (allMessages.count > self.maxMessages) {
            [self cleanupOldMessages];
        }
    });
}

- (void)addMessages:(NSArray<XPMessageItem *> *)messages {
    if (!messages || messages.count == 0) return;
    
    dispatch_async(self.dataQueue, ^{
        NSMutableArray *allMessages = (NSMutableArray *)_allMessages;
        NSMutableArray *chatMessages = (NSMutableArray *)_chatMessages;
        NSMutableArray *giftMessages = (NSMutableArray *)_giftMessages;
        
        for (XPMessageItem *message in messages) {
            [allMessages addObject:message];
            
            // 根据消息类型分发到对应的子数据源
            if ([message isChatMessage]) {
                [chatMessages addObject:message];
            }
            if ([message isGiftMessage]) {
                [giftMessages addObject:message];
            }
        }
        
        // 检查是否需要清理
        if (allMessages.count > self.maxMessages) {
            [self cleanupOldMessages];
        }
    });
}

- (void)removeMessage:(XPMessageItem *)message {
    if (!message) return;
    
    dispatch_async(self.dataQueue, ^{
        NSMutableArray *allMessages = (NSMutableArray *)_allMessages;
        NSMutableArray *chatMessages = (NSMutableArray *)_chatMessages;
        NSMutableArray *giftMessages = (NSMutableArray *)_giftMessages;
        
        [allMessages removeObject:message];
        [chatMessages removeObject:message];
        [giftMessages removeObject:message];
    });
}

- (void)clearAllMessages {
    dispatch_async(self.dataQueue, ^{
        NSMutableArray *allMessages = (NSMutableArray *)_allMessages;
        NSMutableArray *chatMessages = (NSMutableArray *)_chatMessages;
        NSMutableArray *giftMessages = (NSMutableArray *)_giftMessages;
        
        [allMessages removeAllObjects];
        [chatMessages removeAllObjects];
        [giftMessages removeAllObjects];
    });
}

- (NSArray<XPMessageItem *> *)messagesForDisplayType:(NSInteger)displayType {
    __block NSArray *result = nil;
    dispatch_sync(self.dataQueue, ^{
        switch (displayType) {
            case 1: // 所有消息
                result = [_allMessages copy];
                break;
            case 2: // 聊天消息
                result = [_chatMessages copy];
                break;
            case 3: // 礼物消息
                result = [_giftMessages copy];
                break;
            default:
                result = [_allMessages copy];
                break;
        }
    });
    return result;
}

- (void)cleanupOldMessages {
    if (_allMessages.count <= self.maxMessages) return;
    
    // 计算需要移除的消息数量（移除一半）
    NSInteger removeCount = self.maxMessages / 2;
    NSArray *itemsToRemove = [_allMessages subarrayWithRange:NSMakeRange(0, removeCount)];
    
    NSMutableArray *allMessages = (NSMutableArray *)_allMessages;
    NSMutableArray *chatMessages = (NSMutableArray *)_chatMessages;
    NSMutableArray *giftMessages = (NSMutableArray *)_giftMessages;
    
    // 从所有数据源中移除这些消息
    for (XPMessageItem *item in itemsToRemove) {
        [allMessages removeObject:item];
        [chatMessages removeObject:item];
        [giftMessages removeObject:item];
    }
    
    NSLog(@"[XPMessageDataSourceManager] Cleaned up %ld old messages, remaining: %ld", 
          (long)removeCount, (long)_allMessages.count);
}

- (NSInteger)totalMessageCount {
    __block NSInteger count = 0;
    dispatch_sync(self.dataQueue, ^{
        count = _allMessages.count;
    });
    return count;
}

- (NSInteger)messageCountForDisplayType:(NSInteger)displayType {
    __block NSInteger count = 0;
    dispatch_sync(self.dataQueue, ^{
        switch (displayType) {
            case 1: // 所有消息
                count = _allMessages.count;
                break;
            case 2: // 聊天消息
                count = _chatMessages.count;
                break;
            case 3: // 礼物消息
                count = _giftMessages.count;
                break;
            default:
                count = _allMessages.count;
                break;
        }
    });
    return count;
}

#pragma mark - Readonly Properties

- (NSArray<XPMessageItem *> *)allMessages {
    __block NSArray *result = nil;
    dispatch_sync(self.dataQueue, ^{
        result = [_allMessages copy];
    });
    return result;
}

- (NSArray<XPMessageItem *> *)chatMessages {
    __block NSArray *result = nil;
    dispatch_sync(self.dataQueue, ^{
        result = [_chatMessages copy];
    });
    return result;
}

- (NSArray<XPMessageItem *> *)giftMessages {
    __block NSArray *result = nil;
    dispatch_sync(self.dataQueue, ^{
        result = [_giftMessages copy];
    });
    return result;
}

#pragma mark - Debug

- (NSString *)description {
    return [NSString stringWithFormat:@"<XPMessageDataSourceManager: %p, total: %ld, chat: %ld, gift: %ld, max: %ld>", 
            self, (long)[self totalMessageCount], (long)[self messageCountForDisplayType:2], 
            (long)[self messageCountForDisplayType:3], (long)self.maxMessages];
}

@end