//
//  KBSuggestionBarView.m
//  CustomKeyboard
//

#import "KBSuggestionBarView.h"
#import "Masonry.h"
#import "KBSkinManager.h"

@interface KBSuggestionBarView ()
@property (nonatomic, strong) UIScrollView *scrollView;
@property (nonatomic, strong) UIStackView *stackView;
@property (nonatomic, copy) NSArray<NSString *> *items;
@property (nonatomic, strong) UIColor *pillColor;
@property (nonatomic, strong) UIColor *textColor;
@end

@implementation KBSuggestionBarView

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor clearColor];
        [self setupUI];
    }
    return self;
}

- (void)setupUI {
    [self addSubview:self.scrollView];
    [self.scrollView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self);
    }];

    [self.scrollView addSubview:self.stackView];
    [self.stackView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self.scrollView).insets(UIEdgeInsetsMake(0, 8, 0, 8));
        make.height.equalTo(self.scrollView);
    }];

    [self applyTheme:[KBSkinManager shared].current];
}

- (void)updateSuggestions:(NSArray<NSString *> *)suggestions {
    self.items = suggestions ?: @[];

    for (UIView *view in self.stackView.arrangedSubviews) {
        [self.stackView removeArrangedSubview:view];
        [view removeFromSuperview];
    }

    for (NSString *item in self.items) {
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
        btn.layer.cornerRadius = 12.0;
        btn.layer.masksToBounds = YES;
        btn.backgroundColor = self.pillColor ?: [UIColor colorWithWhite:1 alpha:0.9];
        btn.titleLabel.font = [UIFont systemFontOfSize:14 weight:UIFontWeightMedium];
        [btn setTitle:item forState:UIControlStateNormal];
        [btn setTitleColor:self.textColor ?: [UIColor blackColor] forState:UIControlStateNormal];
        btn.contentEdgeInsets = UIEdgeInsetsMake(4, 10, 4, 10);
        [btn addTarget:self action:@selector(onTapSuggestion:) forControlEvents:UIControlEventTouchUpInside];
        [self.stackView addArrangedSubview:btn];
    }

    self.hidden = (self.items.count == 0);
}

- (void)applyTheme:(KBSkinTheme *)theme {
    UIColor *bg = theme.keyBackground ?: [UIColor whiteColor];
    UIColor *text = theme.keyTextColor ?: [UIColor blackColor];
    UIColor *barBg = theme.keyboardBackground ?: [UIColor colorWithWhite:0.95 alpha:1.0];
    self.backgroundColor = barBg;
    self.pillColor = bg;
    self.textColor = text;

    for (UIView *view in self.stackView.arrangedSubviews) {
        if (![view isKindOfClass:[UIButton class]]) { continue; }
        UIButton *btn = (UIButton *)view;
        btn.backgroundColor = self.pillColor;
        [btn setTitleColor:self.textColor forState:UIControlStateNormal];
    }
}

#pragma mark - Actions

- (void)onTapSuggestion:(UIButton *)sender {
    NSString *title = sender.currentTitle ?: @"";
    if (title.length == 0) { return; }
    if ([self.delegate respondsToSelector:@selector(suggestionBarView:didSelectSuggestion:)]) {
        [self.delegate suggestionBarView:self didSelectSuggestion:title];
    }
}

#pragma mark - Lazy

- (UIScrollView *)scrollView {
    if (!_scrollView) {
        _scrollView = [[UIScrollView alloc] init];
        _scrollView.showsHorizontalScrollIndicator = NO;
        _scrollView.alwaysBounceHorizontal = YES;
    }
    return _scrollView;
}

- (UIStackView *)stackView {
    if (!_stackView) {
        _stackView = [[UIStackView alloc] init];
        _stackView.axis = UILayoutConstraintAxisHorizontal;
        _stackView.alignment = UIStackViewAlignmentCenter;
        _stackView.spacing = 8.0;
    }
    return _stackView;
}

@end