//
//  KBChatPanelView.m
//  CustomKeyboard
//

#import "KBChatPanelView.h"
#import "KBChatMessage.h"
#import "KBChatUserCell.h"
#import "KBChatAssistantCell.h"
#import "Masonry.h"

static NSString * const kUserCellIdentifier = @"KBChatUserCell";
static NSString * const kAssistantCellIdentifier = @"KBChatAssistantCell";
static const NSUInteger kKBChatMessageLimit = 10;

@interface KBChatPanelView () <UITableViewDataSource, UITableViewDelegate, KBChatAssistantCellDelegate>
@property (nonatomic, strong) UIView *headerView;
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UIButton *closeButton;
@property (nonatomic, strong) UITableView *tableViewInternal;
@property (nonatomic, strong) NSMutableArray<KBChatMessage *> *messages;
@end

@implementation KBChatPanelView

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        NSLog(@"[KBChatPanelView] ⚠️ initWithFrame 被调用，self=%p", self);
        self.backgroundColor = [UIColor clearColor];
        self.messages = [NSMutableArray array];

        [self addSubview:self.headerView];
        [self addSubview:self.tableViewInternal];

        [self.headerView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.right.equalTo(self);
            make.top.equalTo(self.mas_top);
            make.height.mas_equalTo(KBFit(36.0f));
        }];

        [self.tableViewInternal mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.right.equalTo(self);
            make.top.equalTo(self.headerView.mas_bottom).offset(4);
            make.bottom.equalTo(self.mas_bottom).offset(-8);
        }];
    }
    return self;
}

#pragma mark - Public

- (void)kb_reloadWithMessages:(NSArray<KBChatMessage *> *)messages {
    NSLog(@"[KBChatPanelView] ========== kb_reloadWithMessages ==========");
    NSLog(@"[KBChatPanelView] self=%p, 传入消息数量: %lu", self, (unsigned long)messages.count);
    NSLog(@"[KBChatPanelView] 调用堆栈: %@", [NSThread callStackSymbols]);
    
    [self.messages removeAllObjects];
    if (messages.count > 0) {
        [self.messages addObjectsFromArray:messages];
    }
    [self.tableViewInternal reloadData];
    [self kb_scrollToBottom];
}

- (void)kb_addUserMessage:(NSString *)text {
    if (text.length == 0) return;
    
    NSLog(@"[KBChatPanelView] ========== kb_addUserMessage ==========");
    NSLog(@"[KBChatPanelView] self=%p, messages=%p", self, self.messages);
    NSLog(@"[KBChatPanelView] 添加用户消息: %@", text);
    NSLog(@"[KBChatPanelView] 当前消息数量: %lu", (unsigned long)self.messages.count);
    
    KBChatMessage *msg = [KBChatMessage userMessageWithText:text];
    NSLog(@"[KBChatPanelView] 创建消息 - outgoing: %d, text: %@", msg.outgoing, msg.text);
    [self kb_appendMessage:msg];
    
    NSLog(@"[KBChatPanelView] 添加后消息数量: %lu", (unsigned long)self.messages.count);
    for (NSInteger i = 0; i < self.messages.count; i++) {
        KBChatMessage *m = self.messages[i];
        NSLog(@"[KBChatPanelView] 消息[%ld]: outgoing=%d, isLoading=%d, text=%@", (long)i, m.outgoing, m.isLoading, m.text);
    }
}

- (void)kb_addLoadingAssistantMessage {
    NSLog(@"[KBChatPanelView] ========== kb_addLoadingAssistantMessage ==========");
    NSLog(@"[KBChatPanelView] self=%p, messages=%p", self, self.messages);
    NSLog(@"[KBChatPanelView] 当前消息数量: %lu", (unsigned long)self.messages.count);
    
    KBChatMessage *msg = [KBChatMessage loadingAssistantMessage];
    NSLog(@"[KBChatPanelView] 创建 loading 消息 - outgoing: %d, isLoading: %d", msg.outgoing, msg.isLoading);
    [self kb_appendMessage:msg];
    
    NSLog(@"[KBChatPanelView] 添加后消息数量: %lu", (unsigned long)self.messages.count);
    for (NSInteger i = 0; i < self.messages.count; i++) {
        KBChatMessage *m = self.messages[i];
        NSLog(@"[KBChatPanelView] 消息[%ld]: outgoing=%d, isLoading=%d, text=%@", (long)i, m.outgoing, m.isLoading, m.text);
    }
}

- (void)kb_removeLoadingAssistantMessage {
    NSLog(@"[KBChatPanelView] ========== kb_removeLoadingAssistantMessage ==========");
    NSLog(@"[KBChatPanelView] 当前消息数量: %lu", (unsigned long)self.messages.count);
    for (NSInteger i = 0; i < self.messages.count; i++) {
        KBChatMessage *m = self.messages[i];
        NSLog(@"[KBChatPanelView] 消息[%ld]: outgoing=%d, isLoading=%d, text=%@", (long)i, m.outgoing, m.isLoading, m.text);
    }
    
    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
        KBChatMessage *msg = self.messages[i];
        NSLog(@"[KBChatPanelView] 检查消息[%ld]: outgoing=%d, isLoading=%d", (long)i, msg.outgoing, msg.isLoading);
        // 只移除 AI 消息（outgoing == NO）且是 loading 状态的
        if (!msg.outgoing && msg.isLoading) {
            NSLog(@"[KBChatPanelView] ✅ 找到 loading AI 消息，准备移除索引: %ld", (long)i);
            [self.messages removeObjectAtIndex:i];
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
            [self.tableViewInternal deleteRowsAtIndexPaths:@[indexPath] 
                                          withRowAnimation:UITableViewRowAnimationNone];
            NSLog(@"[KBChatPanelView] 移除后消息数量: %lu", (unsigned long)self.messages.count);
            break;
        }
    }
    
    NSLog(@"[KBChatPanelView] 最终消息数量: %lu", (unsigned long)self.messages.count);
    for (NSInteger i = 0; i < self.messages.count; i++) {
        KBChatMessage *m = self.messages[i];
        NSLog(@"[KBChatPanelView] 最终消息[%ld]: outgoing=%d, isLoading=%d, text=%@", (long)i, m.outgoing, m.isLoading, m.text);
    }
}

- (void)kb_addAssistantMessage:(NSString *)text audioId:(NSString *)audioId {
    NSLog(@"[KBChatPanelView] ========== kb_addAssistantMessage ==========");
    NSLog(@"[KBChatPanelView] self=%p, messages=%p", self, self.messages);
    NSLog(@"[KBChatPanelView] AI 回复文本: %@", text);
    NSLog(@"[KBChatPanelView] audioId: %@", audioId);
    NSLog(@"[KBChatPanelView] 当前消息数量: %lu", (unsigned long)self.messages.count);
    
    // 先移除 loading 消息
    [self kb_removeLoadingAssistantMessage];
    
    NSLog(@"[KBChatPanelView] 移除 loading 后消息数量: %lu", (unsigned long)self.messages.count);
    
    KBChatMessage *msg = [KBChatMessage assistantMessageWithText:text audioId:audioId];
    msg.displayName = KBLocalized(@"AI助手");
    NSLog(@"[KBChatPanelView] 创建 AI 消息 - outgoing: %d, isLoading: %d, needsTypewriter: %d, text: %@", 
          msg.outgoing, msg.isLoading, msg.needsTypewriterEffect, msg.text);
    [self kb_appendMessage:msg];
    
    NSLog(@"[KBChatPanelView] 添加后消息数量: %lu", (unsigned long)self.messages.count);
    for (NSInteger i = 0; i < self.messages.count; i++) {
        KBChatMessage *m = self.messages[i];
        NSLog(@"[KBChatPanelView] 消息[%ld]: outgoing=%d, isLoading=%d, text=%@", (long)i, m.outgoing, m.isLoading, m.text);
    }
}

- (void)kb_updateLastAssistantMessageWithAudioData:(NSData *)audioData duration:(NSTimeInterval)duration {
    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
        KBChatMessage *msg = self.messages[i];
        // 只更新 AI 消息（outgoing == NO）且非 loading 状态的
        if (!msg.outgoing && !msg.isLoading) {
            msg.audioData = audioData;
            msg.audioDuration = duration;
            
            // 刷新该行以更新语音时长显示
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
            KBChatAssistantCell *cell = [self.tableViewInternal cellForRowAtIndexPath:indexPath];
            if ([cell isKindOfClass:[KBChatAssistantCell class]]) {
                // 直接更新 Cell，不刷新整行（避免打断打字机效果）
                if (duration > 0) {
                    // 通过重新配置来更新时长显示
                    // 但不要触发打字机效果
                    msg.needsTypewriterEffect = NO;
                    msg.isComplete = YES;
                }
            }
            NSLog(@"[KBChatPanelView] 更新 AI 消息音频数据，时长: %.2f秒", duration);
            break;
        }
    }
}

- (void)kb_scrollToBottom {
    if (self.messages.count == 0) return;
    
    [self.tableViewInternal layoutIfNeeded];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:self.messages.count - 1 inSection:0];
    [self.tableViewInternal scrollToRowAtIndexPath:indexPath
                                  atScrollPosition:UITableViewScrollPositionBottom
                                          animated:YES];
}

#pragma mark - Private

- (void)kb_appendMessage:(KBChatMessage *)message {
    if (!message) return;
    
    NSInteger oldCount = self.messages.count;
    [self.messages addObject:message];
    
    // 限制消息数量
    if (self.messages.count > kKBChatMessageLimit) {
        NSUInteger overflow = self.messages.count - kKBChatMessageLimit;
        [self.messages removeObjectsInRange:NSMakeRange(0, overflow)];
        [self.tableViewInternal reloadData];
    } else {
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:oldCount inSection:0];
        [self.tableViewInternal insertRowsAtIndexPaths:@[indexPath] 
                                      withRowAnimation:UITableViewRowAnimationNone];
    }
    
    dispatch_async(dispatch_get_main_queue(), ^{
        [self kb_scrollToBottom];
    });
}

#pragma mark - Actions

- (void)kb_onTapClose {
    if ([self.delegate respondsToSelector:@selector(chatPanelViewDidTapClose:)]) {
        [self.delegate chatPanelViewDidTapClose:self];
    }
}

#pragma mark - UITableViewDataSource

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"[KBChatPanelView] ========== cellForRowAtIndexPath: %ld ==========", (long)indexPath.row);
    
    if (indexPath.row >= self.messages.count) {
        NSLog(@"[KBChatPanelView] ❌ 索引越界，返回空 Cell");
        return [[UITableViewCell alloc] init];
    }
    
    KBChatMessage *msg = self.messages[indexPath.row];
    NSLog(@"[KBChatPanelView] 消息: outgoing=%d, isLoading=%d, needsTypewriter=%d, text=%@", 
          msg.outgoing, msg.isLoading, msg.needsTypewriterEffect, msg.text);
    
    if (msg.outgoing) {
        // 用户消息（右侧）
        NSLog(@"[KBChatPanelView] 使用 KBChatUserCell");
        KBChatUserCell *cell = [tableView dequeueReusableCellWithIdentifier:kUserCellIdentifier forIndexPath:indexPath];
        [cell configureWithMessage:msg];
        return cell;
    } else {
        // AI 消息（左侧）
        NSLog(@"[KBChatPanelView] 使用 KBChatAssistantCell");
        KBChatAssistantCell *cell = [tableView dequeueReusableCellWithIdentifier:kAssistantCellIdentifier forIndexPath:indexPath];
        cell.delegate = self;
        [cell configureWithMessage:msg];
        return cell;
    }
}

#pragma mark - UITableViewDelegate

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return UITableViewAutomaticDimension;
}

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return 60.0;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row >= self.messages.count) { return; }
    KBChatMessage *msg = self.messages[indexPath.row];
    if ([self.delegate respondsToSelector:@selector(chatPanelView:didTapMessage:)]) {
        [self.delegate chatPanelView:self didTapMessage:msg];
    }
}

#pragma mark - KBChatAssistantCellDelegate

- (void)assistantCell:(KBChatAssistantCell *)cell didTapVoiceButtonForMessage:(KBChatMessage *)message {
    if ([self.delegate respondsToSelector:@selector(chatPanelView:didTapVoiceButtonForMessage:)]) {
        [self.delegate chatPanelView:self didTapVoiceButtonForMessage:message];
    }
}

#pragma mark - Lazy

- (UITableView *)tableViewInternal {
    if (!_tableViewInternal) {
        _tableViewInternal = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
        _tableViewInternal.backgroundColor = [UIColor clearColor];
        _tableViewInternal.backgroundView = nil;
        _tableViewInternal.separatorStyle = UITableViewCellSeparatorStyleNone;
        _tableViewInternal.dataSource = self;
        _tableViewInternal.delegate = self;
        _tableViewInternal.estimatedRowHeight = 60.0;
        _tableViewInternal.rowHeight = UITableViewAutomaticDimension;
        // 注册两种 Cell
        [_tableViewInternal registerClass:KBChatUserCell.class forCellReuseIdentifier:kUserCellIdentifier];
        [_tableViewInternal registerClass:KBChatAssistantCell.class forCellReuseIdentifier:kAssistantCellIdentifier];
        if (@available(iOS 11.0, *)) {
            _tableViewInternal.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        }
    }
    return _tableViewInternal;
}

- (UIView *)headerView {
    if (!_headerView) {
        _headerView = [[UIView alloc] init];
        _headerView.backgroundColor = [UIColor clearColor];
        [_headerView addSubview:self.titleLabel];
        [_headerView addSubview:self.closeButton];

        [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(_headerView.mas_left).offset(12);
            make.centerY.equalTo(_headerView);
        }];

        [self.closeButton mas_makeConstraints:^(MASConstraintMaker *make) {
            make.right.equalTo(_headerView.mas_right).offset(-12);
            make.centerY.equalTo(_headerView);
            make.width.height.mas_equalTo(KBFit(24.0f));
        }];
    }
    return _headerView;
}

- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] init];
        _titleLabel.font = [UIFont systemFontOfSize:13 weight:UIFontWeightMedium];
        _titleLabel.textColor =
            [UIColor kb_dynamicColorWithLightColor:[UIColor colorWithHex:0x1B1F1A]
                                         darkColor:[UIColor whiteColor]];
        _titleLabel.text = KBLocalized(@"AI对话");
    }
    return _titleLabel;
}

- (UIButton *)closeButton {
    if (!_closeButton) {
        _closeButton = [UIButton buttonWithType:UIButtonTypeCustom];
        UIImage *icon = [UIImage imageNamed:@"close_icon"];
        [_closeButton setImage:icon forState:UIControlStateNormal];
        _closeButton.backgroundColor = [UIColor clearColor];
        [_closeButton addTarget:self
                         action:@selector(kb_onTapClose)
               forControlEvents:UIControlEventTouchUpInside];
    }
    return _closeButton;
}

#pragma mark - Expose

- (UITableView *)tableView { return self.tableViewInternal; }

@end