//
//  KBToolBar.m
//  CustomKeyboard
//
//  Created by Mac on 2025/10/28.
//

#import "KBToolBar.h"
#import "KBResponderUtils.h" // 查找 UIInputViewController，用于系统切换输入法
#import "KBBackspaceUndoManager.h"

@interface KBToolBar ()
@property (nonatomic, strong) UIView *leftContainer;
@property (nonatomic, strong) NSArray<UIButton *> *leftButtonsInternal;
//@property (nonatomic, strong) UIButton *settingsButtonInternal;
@property (nonatomic, strong) UIButton *globeButtonInternal;   // 可选：系统“切换输入法”键
@property (nonatomic, strong) UIButton *undoButtonInternal;    // 右侧撤销删除
@property (nonatomic, assign) BOOL kbNeedsInputModeSwitchKey;
@property (nonatomic, assign) BOOL kbUndoVisible;
@end

@implementation KBToolBar

- (instancetype)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor clearColor];
        _leftButtonTitles = @[KBLocalized(@"Recharge Now"), @"AI"]; // 默认标题
        [self setupUI];
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(kb_undoStateChanged)
                                                     name:KBBackspaceUndoStateDidChangeNotification
                                                   object:nil];
    }
    return self;
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}


#pragma mark - Public

- (NSArray<UIButton *> *)leftButtons {
    return self.leftButtonsInternal;
}

- (UIButton *)undoButton {
    return self.undoButtonInternal;
}

//- (UIButton *)settingsButton {
//    return self.settingsButtonInternal;
//}

- (void)setLeftButtonTitles:(NSArray<NSString *> *)leftButtonTitles {
    _leftButtonTitles = [leftButtonTitles copy];
    // Update titles if buttons already exist
    [self.leftButtonsInternal enumerateObjectsUsingBlock:^(UIButton * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if (idx < self.leftButtonTitles.count) {
            [obj setTitle:self.leftButtonTitles[idx] forState:UIControlStateNormal];
        }
    }];
}

#pragma mark - 视图搭建

- (void)setupUI {
    [self addSubview:self.leftContainer];
//    [self addSubview:self.settingsButtonInternal];
    [self addSubview:self.globeButtonInternal];
    [self addSubview:self.undoButtonInternal];

    // 右侧设置按钮
//    [self.settingsButtonInternal mas_makeConstraints:^(MASConstraintMaker *make) {
//        make.right.equalTo(self.mas_right).offset(-12);
//        make.centerY.equalTo(self.mas_centerY);
//        make.width.height.mas_equalTo(32);
//    }];

    // 左侧地球键（按需显示）
    [self.globeButtonInternal mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.mas_left).offset(12);
        make.centerY.equalTo(self.mas_centerY);
        make.width.height.mas_equalTo(32);
    }];

    // 右侧撤销按钮
    [self.undoButtonInternal mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.mas_right).offset(-12);
        make.centerY.equalTo(self.mas_centerY);
        make.height.mas_equalTo(32);
    }];

    [self kb_updateLeftContainerConstraints];

    // 在左侧容器中创建按钮（数量 = 标题数量）
    NSMutableArray<UIButton *> *buttons = [NSMutableArray arrayWithCapacity:_leftButtonTitles.count];
    UIView *previous = nil;
    for (NSInteger i = 0; i < _leftButtonTitles.count; i++) {
        UIButton *btn = [self buildActionButtonAtIndex:i];
        [self.leftContainer addSubview:btn];
        [buttons addObject:btn];

        [btn mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.bottom.equalTo(self.leftContainer);

            if (previous) {
                make.left.equalTo(previous.mas_right).offset(8);
            } else {
                make.left.equalTo(self.leftContainer.mas_left);
            }
            // 不再设置宽度约束，交给 intrinsicContentSize
        }];

        previous = btn;
    }

    // 可选：最后一个不要一定贴右边，避免被拉伸
    // 如果你希望它最多到右边，可以这样：
    if (previous) {
        [previous mas_makeConstraints:^(MASConstraintMaker *make) {
            make.right.lessThanOrEqualTo(self.leftContainer.mas_right);
        }];
    }

    self.leftButtonsInternal = buttons.copy;

    // 初始刷新地球键的可见性与事件绑定
    [self kb_refreshGlobeVisibility];
    [self kb_updateUndoVisibilityAnimated:NO];
}

- (UIButton *)buildActionButtonAtIndex:(NSInteger)idx {
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.layer.cornerRadius = 16;
    btn.layer.masksToBounds = YES;
    btn.backgroundColor = [UIColor colorWithWhite:1 alpha:0.9];
    btn.titleLabel.font = [UIFont systemFontOfSize:14 weight:UIFontWeightMedium];

    NSString *title = (idx < self.leftButtonTitles.count) ? self.leftButtonTitles[idx] : @"";
    [btn setTitle:title forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    // 关键：左右各 10，按钮宽度 = 文本宽度 + 20
    btn.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 10);
    [btn setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];
    [btn setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];

    btn.tag = idx;
    [btn addTarget:self action:@selector(onLeftAction:) forControlEvents:UIControlEventTouchUpInside];
    return btn;
}

#pragma mark - Actions

- (void)onLeftAction:(UIButton *)sender {
    if ([self.delegate respondsToSelector:@selector(toolBar:didTapActionAtIndex:)]) {
        [self.delegate toolBar:self didTapActionAtIndex:sender.tag];
    }
}

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

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

#pragma mark - Lazy

- (UIView *)leftContainer {
    if (!_leftContainer) {
        _leftContainer = [[UIView alloc] init];
        _leftContainer.backgroundColor = [UIColor clearColor];
    }
    return _leftContainer;
}

//- (UIButton *)settingsButtonInternal {
//    if (!_settingsButtonInternal) {
//        _settingsButtonInternal = [UIButton buttonWithType:UIButtonTypeSystem];
//        _settingsButtonInternal.layer.cornerRadius = 16;
//        _settingsButtonInternal.layer.masksToBounds = YES;
//        _settingsButtonInternal.backgroundColor = [UIColor colorWithWhite:1 alpha:0.9];
//    [_settingsButtonInternal setTitle:@"⚙︎" forState:UIControlStateNormal]; // 简单的齿轮符号
//        [_settingsButtonInternal setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
//        [_settingsButtonInternal addTarget:self action:@selector(onSettings) forControlEvents:UIControlEventTouchUpInside];
//    }
//    return _settingsButtonInternal;
//}

- (UIButton *)globeButtonInternal {
    if (!_globeButtonInternal) {
        _globeButtonInternal = [UIButton buttonWithType:UIButtonTypeSystem];
        _globeButtonInternal.layer.cornerRadius = 16;
        _globeButtonInternal.layer.masksToBounds = YES;
        _globeButtonInternal.backgroundColor = [UIColor colorWithWhite:1 alpha:0.9];
        [_globeButtonInternal setTitle:@"🌐" forState:UIControlStateNormal];
        [_globeButtonInternal setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    }
    return _globeButtonInternal;
}

- (UIButton *)undoButtonInternal {
    if (!_undoButtonInternal) {
        _undoButtonInternal = [UIButton buttonWithType:UIButtonTypeSystem];
        _undoButtonInternal.layer.cornerRadius = 16;
        _undoButtonInternal.layer.masksToBounds = YES;
        _undoButtonInternal.backgroundColor = [UIColor colorWithWhite:1 alpha:0.9];
        _undoButtonInternal.titleLabel.font = [UIFont systemFontOfSize:14 weight:UIFontWeightMedium];
        [_undoButtonInternal setTitle:@"撤销删除" forState:UIControlStateNormal];
        [_undoButtonInternal setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        _undoButtonInternal.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 10);
        _undoButtonInternal.hidden = YES;
        _undoButtonInternal.alpha = 0.0;
        [_undoButtonInternal addTarget:self action:@selector(onUndo) forControlEvents:UIControlEventTouchUpInside];
    }
    return _undoButtonInternal;
}

#pragma mark - Globe (Input Mode Switch)

// 根据宿主是否已提供系统切换键，决定是否显示地球按钮；并绑定系统事件。
- (void)kb_refreshGlobeVisibility {
    UIInputViewController *ivc = KBFindInputViewController(self);
    BOOL needSwitchKey = YES;
    if (ivc && [ivc respondsToSelector:@selector(needsInputModeSwitchKey)]) {
        needSwitchKey = ivc.needsInputModeSwitchKey; // YES 表示自定义键盘需要提供切换键
    }

    self.globeButtonInternal.hidden = !needSwitchKey;
    self.kbNeedsInputModeSwitchKey = needSwitchKey;

    [self kb_updateLeftContainerConstraints];

    // 绑定系统提供的输入法切换处理（点按切换、长按弹出列表）
    // 仅在需要时绑定，避免多余的事件转发
    [self.globeButtonInternal removeTarget:nil action:NULL forControlEvents:UIControlEventAllEvents];
    if (needSwitchKey && ivc) {
        SEL sel = NSSelectorFromString(@"handleInputModeListFromView:withEvent:");
        if ([ivc respondsToSelector:sel]) {
            [self.globeButtonInternal addTarget:ivc action:sel forControlEvents:UIControlEventAllTouchEvents];
        } else {
            // 回退：至少在点按时切换
            [self.globeButtonInternal addTarget:ivc action:@selector(advanceToNextInputMode) forControlEvents:UIControlEventTouchUpInside];
        }
    }
}

- (void)kb_updateLeftContainerConstraints {
    [self.leftContainer mas_remakeConstraints:^(MASConstraintMaker *make) {
        if (self.kbNeedsInputModeSwitchKey) {
            make.left.equalTo(self.globeButtonInternal.mas_right).offset(8);
        } else {
            make.left.equalTo(self.mas_left).offset(12);
        }
        if (self.kbUndoVisible) {
            make.right.equalTo(self.undoButtonInternal.mas_left).offset(-8);
        } else {
            make.right.equalTo(self).offset(-12);
        }
        make.centerY.equalTo(self.mas_centerY);
        make.height.mas_equalTo(32);
    }];
}

- (void)kb_undoStateChanged {
    [self kb_updateUndoVisibilityAnimated:YES];
}

- (void)kb_updateUndoVisibilityAnimated:(BOOL)animated {
    BOOL visible = [KBBackspaceUndoManager shared].hasUndo;
    if (self.kbUndoVisible == visible) { return; }
    self.kbUndoVisible = visible;
    self.undoButtonInternal.hidden = NO;

    [self kb_updateLeftContainerConstraints];
    void (^changes)(void) = ^{
        self.undoButtonInternal.alpha = visible ? 1.0 : 0.0;
        [self layoutIfNeeded];
    };
    void (^finish)(BOOL) = ^(BOOL finished) {
        self.undoButtonInternal.hidden = !visible;
    };

    if (animated) {
        [UIView animateWithDuration:0.18
                              delay:0
                            options:UIViewAnimationOptionCurveEaseInOut
                         animations:changes
                         completion:finish];
    } else {
        changes();
        finish(YES);
    }
}

- (void)didMoveToWindow {
    [super didMoveToWindow];
    [self kb_refreshGlobeVisibility];
}

@end