//
//  ViewController.m

#import "ViewController.h"
#import "AudioTool.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()

/** 播放器 */
@property (nonatomic, strong) AVAudioPlayer *player;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (IBAction)otherMusic {
    
    [AudioTool playMusicWithMusicName:@"120125029.mp3"];
    
    /*
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"120125029.mp3" withExtension:nil];
    [self.player setValue:url forKeyPath:@"url"];
    
    [self.player play];
     */
}

- (IBAction)play {
    /*
    // 取出資源的URL
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"1201111234.mp3" withExtension:nil];
    
    // 建立播放器
    NSError *error = nil;
    AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    
    // 準備播放
    [player prepareToPlay];
     */
    
    // 播放歌曲
    // [self.player play];
    [AudioTool playMusicWithMusicName:@"1201111234.mp3"];
}

- (IBAction)pause {
    // [self.player pause];
    [AudioTool pauseMusicWithMusicName:@"1201111234.mp3"];
}

- (IBAction)stop {
    // [self.player stop];
    // self.player = nil;
    [AudioTool stopMusicWithMusicName:@"1201111234.mp3"];
}

//#pragma mark - 懶載入
//- (AVAudioPlayer *)player
//{
//    if (_player == nil) {
//        // 取出資源的URL
//        NSURL *url = [[NSBundle mainBundle] URLForResource:@"1201111234.mp3" withExtension:nil];
//        
//        // 建立播放器
//        NSError *error = nil;
//        self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
//        
//        // 準備播放
//        [self.player prepareToPlay];
//    }
//    
//    return _player;
//}

@end
 

//
//  XMGAudioTool.m
//

#import "AudioTool.h"
#import <AVFoundation/AVFoundation.h>

@implementation AudioTool

static NSMutableDictionary *_soundIDs;
static NSMutableDictionary *_players;

+ (void)initialize
{
    _soundIDs = [NSMutableDictionary dictionary];
    _players = [NSMutableDictionary dictionary];
}

+ (void)playMusicWithMusicName:(NSString *)musicName
{
    assert(musicName);
    
    // 1.定義播放器
    AVAudioPlayer *player = nil;
    
    // 2.從字典中取player,如果取出出來是空,則對應建立對應的播放器
    player = _players[musicName];
    if (player == nil) {
        // 2.1.獲取對應音樂資源
        NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:musicName withExtension:nil];
        
        if (fileUrl == nil) return;
        
        // 2.2.建立對應的播放器
        player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:nil];
        
        // 2.3.將player存入字典中
        [_players setObject:player forKey:musicName];
        
        // 2.4.準備播放
        [player prepareToPlay];
    }
    
    // 3.播放音樂
    [player play];
}

+ (void)pauseMusicWithMusicName:(NSString *)musicName
{
    assert(musicName);
    
    // 1.取出對應的播放
    AVAudioPlayer *player = _players[musicName];
    
    // 2.判斷player是否nil
    if (player) {
        [player pause];
    }
}

+ (void)stopMusicWithMusicName:(NSString *)musicName
{
    assert(musicName);
    
    // 1.取出對應的播放
    AVAudioPlayer *player = _players[musicName];
    
    // 2.判斷player是否nil
    if (player) {
        [player stop];
        [_players removeObjectForKey:musicName];
        player = nil;
    }
}

#pragma mark - 音效的播放
+ (void)playSoundWithSoundname:(NSString *)soundname
{
    // 1.定義SystemSoundID
    SystemSoundID soundID = 0;
    
    // 2.從字典中取出對應soundID,如果取出是nil,表示之前沒有存放在字典
    soundID = [_soundIDs[soundname] unsignedIntValue];
    if (soundID == 0) {
        CFURLRef url = (__bridge CFURLRef)[[NSBundle mainBundle] URLForResource:soundname withExtension:nil];
        
        if (url == NULL) return;
        
        AudioServicesCreateSystemSoundID(url, &soundID);
        
        // 將soundID存入字典
        [_soundIDs setObject:@(soundID) forKey:soundname];
    }
    
    // 3.播放音效
    AudioServicesPlaySystemSound(soundID);
}

@end