//
//  KBAiRecordButton.m
//  keyBoard
//
//  Created by Mac on 2026/1/15.
//

#import "KBAiRecordButton.h"
#import "KBAiWaveformView.h"

@interface KBAiRecordButton ()

@property(nonatomic, strong) UIView *backgroundView;
@property(nonatomic, strong) UILabel *titleLabel;
@property(nonatomic, strong) KBAiWaveformView *waveformView;
@property(nonatomic, strong) UIImageView *micIconView;
@property(nonatomic, assign) BOOL isPressing;

@end

@implementation KBAiRecordButton

- (instancetype)initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  if (self) {
    [self setup];
  }
  return self;
}

- (instancetype)initWithCoder:(NSCoder *)coder {
  self = [super initWithCoder:coder];
  if (self) {
    [self setup];
  }
  return self;
}

- (void)setup {
  _state = KBAiRecordButtonStateNormal;
  _normalTitle = @"按住说话";
  _recordingTitle = @"松开结束";
  _tintColor = [UIColor systemBlueColor];

  // 背景视图
  self.backgroundView = [[UIView alloc] init];
  self.backgroundView.backgroundColor = [UIColor systemGray6Color];
  self.backgroundView.layer.cornerRadius = 25;
  self.backgroundView.layer.masksToBounds = YES;
  self.backgroundView.translatesAutoresizingMaskIntoConstraints = NO;
  [self addSubview:self.backgroundView];

  // 麦克风图标
  self.micIconView = [[UIImageView alloc] init];
  self.micIconView.image = [UIImage systemImageNamed:@"mic.fill"];
  self.micIconView.tintColor = self.tintColor;
  self.micIconView.contentMode = UIViewContentModeScaleAspectFit;
  self.micIconView.translatesAutoresizingMaskIntoConstraints = NO;
  [self.backgroundView addSubview:self.micIconView];

  // 标题标签
  self.titleLabel = [[UILabel alloc] init];
  self.titleLabel.text = self.normalTitle;
  self.titleLabel.font = [UIFont systemFontOfSize:16 weight:UIFontWeightMedium];
  self.titleLabel.textColor = [UIColor labelColor];
  self.titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
  [self.backgroundView addSubview:self.titleLabel];

  // 波形视图（录音时显示）
  self.waveformView = [[KBAiWaveformView alloc] init];
  self.waveformView.waveColor = self.tintColor;
  self.waveformView.alpha = 0;
  self.waveformView.translatesAutoresizingMaskIntoConstraints = NO;
  [self.backgroundView addSubview:self.waveformView];

  // 布局约束
  [NSLayoutConstraint activateConstraints:@[
    [self.backgroundView.topAnchor constraintEqualToAnchor:self.topAnchor],
    [self.backgroundView.bottomAnchor
        constraintEqualToAnchor:self.bottomAnchor],
    [self.backgroundView.leadingAnchor
        constraintEqualToAnchor:self.leadingAnchor],
    [self.backgroundView.trailingAnchor
        constraintEqualToAnchor:self.trailingAnchor],

    [self.micIconView.leadingAnchor
        constraintEqualToAnchor:self.backgroundView.leadingAnchor
                       constant:20],
    [self.micIconView.centerYAnchor
        constraintEqualToAnchor:self.backgroundView.centerYAnchor],
    [self.micIconView.widthAnchor constraintEqualToConstant:24],
    [self.micIconView.heightAnchor constraintEqualToConstant:24],

    [self.titleLabel.leadingAnchor
        constraintEqualToAnchor:self.micIconView.trailingAnchor
                       constant:12],
    [self.titleLabel.centerYAnchor
        constraintEqualToAnchor:self.backgroundView.centerYAnchor],

    [self.waveformView.trailingAnchor
        constraintEqualToAnchor:self.backgroundView.trailingAnchor
                       constant:-20],
    [self.waveformView.centerYAnchor
        constraintEqualToAnchor:self.backgroundView.centerYAnchor],
    [self.waveformView.widthAnchor constraintEqualToConstant:60],
    [self.waveformView.heightAnchor constraintEqualToConstant:30],
  ]];

  // 添加手势
  UILongPressGestureRecognizer *longPress =
      [[UILongPressGestureRecognizer alloc]
          initWithTarget:self
                  action:@selector(handleLongPress:)];
  longPress.minimumPressDuration = 0.05;
  [self addGestureRecognizer:longPress];
}

#pragma mark - Setters

- (void)setState:(KBAiRecordButtonState)state {
  if (_state == state)
    return;
  _state = state;

  [self updateAppearance];
}

- (void)setTintColor:(UIColor *)tintColor {
  _tintColor = tintColor;
  self.micIconView.tintColor = tintColor;
  self.waveformView.waveColor = tintColor;
}

#pragma mark - Public Methods

- (void)updateVolumeRMS:(float)rms {
  [self.waveformView updateWithRMS:rms];
}

#pragma mark - Private Methods

- (void)updateAppearance {
  switch (self.state) {
  case KBAiRecordButtonStateNormal:
    self.titleLabel.text = self.normalTitle;
    self.backgroundView.backgroundColor = [UIColor systemGray6Color];
    self.micIconView.alpha = 1;
    self.waveformView.alpha = 0;
    [self.waveformView stopAnimation];
    break;

  case KBAiRecordButtonStateRecording:
    self.titleLabel.text = self.recordingTitle;
    self.backgroundView.backgroundColor =
        [self.tintColor colorWithAlphaComponent:0.15];
    self.micIconView.alpha = 1;
    self.waveformView.alpha = 1;
    [self.waveformView startIdleAnimation];
    break;

  case KBAiRecordButtonStateDisabled:
    self.titleLabel.text = self.normalTitle;
    self.backgroundView.backgroundColor = [UIColor systemGray5Color];
    self.alpha = 0.5;
    break;
  }
}

- (void)handleLongPress:(UILongPressGestureRecognizer *)gesture {
  if (self.state == KBAiRecordButtonStateDisabled) {
    return;
  }

  CGPoint location = [gesture locationInView:self];
  BOOL isInside = CGRectContainsPoint(self.bounds, location);

  switch (gesture.state) {
  case UIGestureRecognizerStateBegan:
    self.isPressing = YES;
    [self animateScale:0.95];
    self.state = KBAiRecordButtonStateRecording;

    if ([self.delegate
            respondsToSelector:@selector(recordButtonDidBeginPress:)]) {
      [self.delegate recordButtonDidBeginPress:self];
    }
    break;

  case UIGestureRecognizerStateChanged:
    if (!isInside && self.isPressing) {
      // 手指滑出
      [self animateScale:1.0];
    } else if (isInside && self.isPressing) {
      // 手指滑回
      [self animateScale:0.95];
    }
    break;

  case UIGestureRecognizerStateEnded:
    if (self.isPressing) {
      self.isPressing = NO;
      [self animateScale:1.0];
      self.state = KBAiRecordButtonStateNormal;
      [self.waveformView reset];

      if (isInside) {
        if ([self.delegate
                respondsToSelector:@selector(recordButtonDidEndPress:)]) {
          [self.delegate recordButtonDidEndPress:self];
        }
      } else {
        if ([self.delegate
                respondsToSelector:@selector(recordButtonDidCancelPress:)]) {
          [self.delegate recordButtonDidCancelPress:self];
        }
      }
    }
    break;

  case UIGestureRecognizerStateCancelled:
  case UIGestureRecognizerStateFailed:
    if (self.isPressing) {
      self.isPressing = NO;
      [self animateScale:1.0];
      self.state = KBAiRecordButtonStateNormal;
      [self.waveformView reset];

      if ([self.delegate
              respondsToSelector:@selector(recordButtonDidCancelPress:)]) {
        [self.delegate recordButtonDidCancelPress:self];
      }
    }
    break;

  default:
    break;
  }
}

- (void)animateScale:(CGFloat)scale {
  [UIView animateWithDuration:0.15
                   animations:^{
                     self.backgroundView.transform =
                         CGAffineTransformMakeScale(scale, scale);
                   }];
}

@end