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

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

@interface KBSuggestionBarView ()
@property (nonatomic, strong) UIStackView *stackView;
@property (nonatomic, strong) UIView *topLineView;
@property (nonatomic, strong) UIView *bottomLineView;
@property (nonatomic, copy) NSArray<NSString *> *items;
@property (nonatomic, strong) UIColor *textColor;
@property (nonatomic, strong) UIColor *separatorColor;
@property (nonatomic, strong) UIColor *highlightColor;
@end

@implementation KBSuggestionBarView

- (NSInteger)kb_buttonTag {
    return 10001;
}

- (NSInteger)kb_separatorTag {
    return 10002;
}

- (UIImage *)kb_imageWithColor:(UIColor *)color {
    if (!color) { color = [UIColor clearColor]; }
    CGRect rect = CGRectMake(0, 0, 1, 1);
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(ctx, color.CGColor);
    CGContextFillRect(ctx, rect);
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

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

- (void)setupUI {
    [self addSubview:self.stackView];
    [self.stackView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self);
        make.top.equalTo(self);
        make.bottom.equalTo(self);
    }];

    [self addSubview:self.topLineView];
    [self.topLineView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.top.equalTo(self);
        make.height.mas_equalTo(0.5);
    }];

    [self addSubview:self.bottomLineView];
    [self.bottomLineView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.bottom.equalTo(self);
        make.height.mas_equalTo(0.5);
    }];

    [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];
    }

    NSUInteger count = self.items.count;
    for (NSUInteger idx = 0; idx < count; idx++) {
        NSString *item = self.items[idx];
        UIView *container = [UIView new];
        container.backgroundColor = UIColor.clearColor;

        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        btn.tag = [self kb_buttonTag];
        btn.backgroundColor = UIColor.clearColor;
        btn.layer.cornerRadius = 8.0;
        btn.layer.masksToBounds = YES;
        btn.adjustsImageWhenHighlighted = NO;
        btn.titleLabel.font = [UIFont systemFontOfSize:15 weight:UIFontWeightRegular];
        btn.titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;
        btn.titleLabel.adjustsFontSizeToFitWidth = YES;
        btn.titleLabel.minimumScaleFactor = 0.85;
        btn.contentEdgeInsets = UIEdgeInsetsMake(0, 12, 0, 12);
        [btn setTitle:item forState:UIControlStateNormal];
        [btn setTitleColor:self.textColor ?: UIColor.blackColor forState:UIControlStateNormal];
        if (self.highlightColor) {
            [btn setBackgroundImage:[self kb_imageWithColor:self.highlightColor] forState:UIControlStateHighlighted];
        }
        [btn addTarget:self action:@selector(onTapSuggestion:) forControlEvents:UIControlEventTouchUpInside];
        [container addSubview:btn];
        [btn mas_makeConstraints:^(MASConstraintMaker *make) {
            make.edges.equalTo(container);
        }];

        if (idx + 1 < count) {
            UIView *sep = [UIView new];
            sep.tag = [self kb_separatorTag];
            sep.userInteractionEnabled = NO;
            sep.backgroundColor = self.separatorColor ?: [UIColor colorWithWhite:0 alpha:0.12];
            [container addSubview:sep];
            [sep mas_makeConstraints:^(MASConstraintMaker *make) {
                make.right.equalTo(container.mas_right);
                make.centerY.equalTo(container.mas_centerY);
                make.width.mas_equalTo(0.5);
                make.height.equalTo(container.mas_height).multipliedBy(0.55);
            }];
        }

        [self.stackView addArrangedSubview:container];
    }

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

- (void)applyTheme:(KBSkinTheme *)theme {
    UIColor *barBg = theme.keyboardBackground ?: [UIColor colorWithWhite:0.95 alpha:1.0];
    UIColor *text = theme.keyTextColor ?: UIColor.blackColor;
    UIColor *highlight = theme.keyHighlightBackground ?: [UIColor colorWithWhite:0.85 alpha:1.0];
    self.backgroundColor = barBg;
    self.textColor = text;
    self.separatorColor = [text colorWithAlphaComponent:0.12];
    self.highlightColor = [highlight colorWithAlphaComponent:0.25];
    self.topLineView.backgroundColor = [text colorWithAlphaComponent:0.08];
    self.bottomLineView.backgroundColor = [text colorWithAlphaComponent:0.06];

    for (UIView *view in self.stackView.arrangedSubviews) {
        UIButton *btn = (UIButton *)[view viewWithTag:[self kb_buttonTag]];
        if ([btn isKindOfClass:UIButton.class]) {
            [btn setTitleColor:self.textColor ?: UIColor.blackColor forState:UIControlStateNormal];
            [btn setBackgroundImage:[self kb_imageWithColor:self.highlightColor] forState:UIControlStateHighlighted];
        }
        UIView *sep = [view viewWithTag:[self kb_separatorTag]];
        if (sep) {
            sep.backgroundColor = self.separatorColor ?: [UIColor colorWithWhite:0 alpha:0.12];
        }
    }
}

#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

- (UIStackView *)stackView {
    if (!_stackView) {
        _stackView = [[UIStackView alloc] init];
        _stackView.axis = UILayoutConstraintAxisHorizontal;
        _stackView.alignment = UIStackViewAlignmentFill;
        _stackView.distribution = UIStackViewDistributionFillEqually;
        _stackView.spacing = 0.0;
        _stackView.layoutMarginsRelativeArrangement = YES;
        _stackView.layoutMargins = UIEdgeInsetsMake(0, 8, 0, 8);
    }
    return _stackView;
}

- (UIView *)topLineView {
    if (!_topLineView) {
        _topLineView = [UIView new];
        _topLineView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.06];
    }
    return _topLineView;
}

- (UIView *)bottomLineView {
    if (!_bottomLineView) {
        _bottomLineView = [UIView new];
        _bottomLineView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.04];
    }
    return _bottomLineView;
}

@end