veza/veza-stream-server/src/audio/processing.rs

use std::{
    collections::HashMap,
    path::{Path, PathBuf},
    sync::Arc,
    time::{Duration, SystemTime},
};
use tokio::sync::RwLock;

// Imports simplifiés pour éviter les erreurs de compilation
use serde::{Deserialize, Serialize};
// Note: Use tracing::info! macro directly instead of importing
use crate::config::Config;

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioMetadata {
    pub duration_seconds: f64,
    pub sample_rate: u32,
    pub channels: u32,
    pub bitrate_kbps: Option<u32>,
    pub codec: String,
    pub title: Option<String>,
    pub artist: Option<String>,
    pub album: Option<String>,
    pub year: Option<u32>,
    pub genre: Option<String>,
    pub artwork_available: bool,
    pub file_size: u64,
    pub last_modified: SystemTime,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WaveformData {
    pub peaks: Vec<f32>,  // Amplitude peaks pour la visualisation
    pub rms: Vec<f32>,    // RMS values pour un rendu plus smooth
    pub sample_rate: u32, // Taux d'échantillonnage des données de waveform
    pub duration_ms: u32, // Durée en millisecondes
    pub generated_at: SystemTime,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioQuality {
    pub bitrate_kbps: u32,
    pub sample_rate: u32,
    pub channels: u32,
    pub codec: String,
}

impl AudioQuality {
    pub fn high_quality() -> Self {
        Self {
            bitrate_kbps: 320,
            sample_rate: 44100,
            channels: 2,
            codec: "mp3".to_string(),
        }
    }

    pub fn medium_quality() -> Self {
        Self {
            bitrate_kbps: 192,
            sample_rate: 44100,
            channels: 2,
            codec: "mp3".to_string(),
        }
    }

    pub fn low_quality() -> Self {
        Self {
            bitrate_kbps: 128,
            sample_rate: 22050,
            channels: 1,
            codec: "mp3".to_string(),
        }
    }
}

#[derive(Debug, Clone)]
pub struct AudioProcessor {
    _config: Arc<Config>,
    metadata_cache: Arc<RwLock<HashMap<PathBuf, AudioMetadata>>>,
    waveform_cache: Arc<RwLock<HashMap<PathBuf, WaveformData>>>,
}

impl AudioProcessor {
    pub fn new(config: Arc<Config>) -> Self {
        Self {
            _config: config,
            metadata_cache: Arc::new(RwLock::new(HashMap::new())),
            waveform_cache: Arc::new(RwLock::new(HashMap::new())),
        }
    }

    /// Extrait les métadonnées d'un fichier audio
    pub async fn extract_metadata(
        &self,
        file_path: &Path,
    ) -> Result<AudioMetadata, Box<dyn std::error::Error + Send + Sync>> {
        // Vérifier le cache d'abord
        if let Some(metadata) = self.metadata_cache.read().await.get(file_path) {
            return Ok(metadata.clone());
        }

        // Extraire les métadonnées réelles
        let metadata = self.extract_metadata_from_file(file_path).await?;

        // Mettre en cache
        self.metadata_cache
            .write()
            .await
            .insert(file_path.to_path_buf(), metadata.clone());

        Ok(metadata)
    }

    async fn extract_metadata_from_file(
        &self,
        file_path: &Path,
    ) -> Result<AudioMetadata, Box<dyn std::error::Error + Send + Sync>> {
        // Implémentation basique - dans un vrai projet, on utiliserait symphonia
        let file_metadata = std::fs::metadata(file_path)?;

        Ok(AudioMetadata {
            duration_seconds: 180.0, // Valeur par défaut
            sample_rate: 44100,
            channels: 2,
            bitrate_kbps: Some(320),
            codec: "MP3".to_string(),
            title: file_path
                .file_stem()
                .and_then(|s| s.to_str())
                .map(|s| s.to_string()),
            artist: None,
            album: None,
            year: None,
            genre: None,
            artwork_available: false,
            file_size: file_metadata.len(),
            last_modified: file_metadata.modified().unwrap_or(SystemTime::UNIX_EPOCH),
        })
    }

    /// Génère les données de waveform pour la visualisation
    pub async fn generate_waveform(
        &self,
        file_path: &Path,
        resolution: usize,
    ) -> Result<WaveformData, Box<dyn std::error::Error + Send + Sync>> {
        // Vérifier le cache d'abord
        if let Some(waveform) = self.waveform_cache.read().await.get(file_path) {
            return Ok(waveform.clone());
        }

        // Générer la waveform
        let waveform = self.generate_waveform_data(file_path, resolution).await?;

        // Mettre en cache
        self.waveform_cache
            .write()
            .await
            .insert(file_path.to_path_buf(), waveform.clone());

        Ok(waveform)
    }

    async fn generate_waveform_data(
        &self,
        _file_path: &Path,
        resolution: usize,
    ) -> Result<WaveformData, Box<dyn std::error::Error + Send + Sync>> {
        // Implémentation basique - génère des données de test
        let peaks: Vec<f32> = (0..resolution)
            .map(|i| ((i as f32 * 0.1).sin() * 0.8).abs())
            .collect();

        let rms: Vec<f32> = peaks.iter().map(|&p| p * 0.7).collect();

        Ok(WaveformData {
            peaks,
            rms,
            sample_rate: 44100,
            duration_ms: 180000, // 3 minutes
            generated_at: SystemTime::now(),
        })
    }

    /// Analyse spectrale pour obtenir les fréquences dominantes
    pub async fn analyze_spectrum(
        &self,
        _file_path: &Path,
        fft_size: usize,
    ) -> Result<Vec<f32>, Box<dyn std::error::Error + Send + Sync>> {
        // Implémentation basique - génère des données de test
        let spectrum: Vec<f32> = (0..fft_size / 2)
            .map(|i| {
                let freq = i as f32 / (fft_size as f32 / 2.0);
                (freq * 10.0).sin().abs() * (1.0 - freq).max(0.0)
            })
            .collect();

        Ok(spectrum)
    }

    /// Transcode un fichier audio vers une qualité différente
    pub async fn transcode_quality(
        &self,
        input_path: &Path,
        output_path: &Path,
        quality: AudioQuality,
    ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        tracing::info!(
            "Transcodage de {:?} vers {:?} avec qualité {:?}",
            input_path,
            output_path,
            quality
        );

        // Pour l'instant, implémentation simplifiée
        // En production, on utiliserait FFmpeg ou un encodeur dédié
        let metadata = self.extract_metadata(input_path).await?;

        tracing::debug!(
            "Transcodage requis: {} Hz -> {} Hz, {} -> {} canaux",
            metadata.sample_rate,
            quality.sample_rate,
            metadata.channels,
            quality.channels
        );

        // Cette fonction serait complétée avec un vrai transcodeur
        tracing::warn!("Transcodage non encore implémenté - nécessite un encodeur MP3/AAC");

        Ok(())
    }

    /// Nettoie les caches expirés
    pub async fn cleanup_caches(&self, max_age_hours: u64) {
        let cutoff = SystemTime::now() - std::time::Duration::from_secs(max_age_hours * 3600);

        {
            let mut metadata_cache = self.metadata_cache.write().await;
            let before_count = metadata_cache.len();
            metadata_cache.retain(|_, _| true); // Pour l'instant, pas de timestamp sur les métadonnées
            tracing::debug!("Nettoyage cache métadonnées: {} entrées", before_count);
        }

        {
            let mut waveform_cache = self.waveform_cache.write().await;
            let before_count = waveform_cache.len();
            waveform_cache.retain(|_, waveform| waveform.generated_at > cutoff);
            let after_count = waveform_cache.len();
            if before_count > after_count {
                tracing::info!(
                    "Nettoyage cache waveform: {} -> {} entrées",
                    before_count,
                    after_count
                );
            }
        }
    }

    /// Obtient les statistiques des caches
    pub async fn get_cache_stats(&self) -> serde_json::Value {
        let metadata_cache = self.metadata_cache.read().await;
        let waveform_cache = self.waveform_cache.read().await;

        serde_json::json!({
            "metadata_cache_entries": metadata_cache.len(),
            "waveform_cache_entries": waveform_cache.len(),
            "total_cache_entries": metadata_cache.len() + waveform_cache.len()
        })
    }

    pub async fn clear_cache(&self) {
        self.metadata_cache.write().await.clear();
        self.waveform_cache.write().await.clear();
    }
}

impl Default for AudioProcessor {
    fn default() -> Self {
        // Utiliser une configuration par défaut simple pour les tests
        let config = Config::from_env().unwrap_or_else(|_| {
            // Valeurs par défaut minimales si from_env échoue
            Config {
                secret_key: "default_secret_key_for_testing_only".to_string(),
                port: 8082,
                backend_url: "http://backend-api:8080".to_string(),
                audio_dir: "./audio".to_string(),
                allowed_origins: vec!["*".to_string()],
                max_file_size: 100 * 1024 * 1024,
                max_range_size: 10 * 1024 * 1024,
                signature_tolerance: 60,
                database: crate::config::DatabaseConfig {
                    url: std::env::var("DATABASE_URL").unwrap_or_else(|_| {
                        "postgres://veza:veza_password@postgres:5432/veza_db?sslmode=disable"
                            .to_string()
                    }),
                    max_connections: 10,
                    min_connections: 1,
                    connection_timeout: Duration::from_secs(30),
                    idle_timeout: Duration::from_secs(600),
                    max_lifetime: Duration::from_secs(1800),
                    enable_logging: false,
                    migrate_on_start: true,
                },
                cache: crate::config::CacheConfig {
                    max_size_mb: 256,
                    ttl_seconds: 3600,
                    cleanup_interval: Duration::from_secs(300),
                    compression_enabled: false,
                    redis_url: None,
                    redis_pool_size: None,
                },
                security: crate::config::SecurityConfig {
                    jwt_secret: None,
                    jwt_public_key_path: None,
                    jwt_expiration: Duration::from_secs(3600),
                    bcrypt_cost: 10,
                    rate_limit_requests_per_minute: 60,
                    rate_limit_burst: 10,
                    cors_max_age: Duration::from_secs(3600),
                    csrf_protection: false,
                    secure_headers: true,
                    tls_cert_path: None,
                    tls_key_path: None,
                },
                performance: crate::config::PerformanceConfig {
                    worker_threads: None,
                    max_blocking_threads: None,
                    thread_stack_size: None,
                    tcp_nodelay: true,
                    tcp_keepalive: None,
                    buffer_size: 65536,
                    max_concurrent_streams: 100,
                    stream_timeout: Duration::from_secs(30),
                    compression_level: 6,
                },
                monitoring: crate::config::MonitoringConfig {
                    metrics_enabled: false,
                    metrics_port: 9090,
                    health_check_interval: Duration::from_secs(30),
                    log_level: "info".to_string(),
                    log_format: crate::config::LogFormat::Pretty,
                    jaeger_endpoint: None,
                    prometheus_namespace: "stream_server".to_string(),
                    alert_webhooks: vec![],
                },
                notifications: crate::config::NotificationConfig {
                    enabled: false,
                    max_queue_size: 1000,
                    delivery_workers: 2,
                    retry_attempts: 3,
                    retry_delay: Duration::from_secs(60),
                    batch_size: 10,
                    email_provider: None,
                    sms_provider: None,
                    push_provider: None,
                },
                compression: crate::config::CompressionConfig {
                    enabled: false,
                    output_dir: "./compressed".to_string(),
                    temp_dir: "./temp".to_string(),
                    max_concurrent_jobs: 2,
                    cleanup_after_days: 30,
                    ffmpeg_path: None,
                    quality_profiles: vec![],
                },
                rabbit_mq: crate::config::RabbitMQConfig {
                    // Added rabbit_mq config
                    url: "amqp://guest:guest@localhost:5672/".to_string(),
                    max_retries: 3,
                    retry_interval_secs: 2,
                    enable: true,
                },
                environment: crate::config::Environment::Development,
            }
        });
        Self::new(Arc::new(config))
    }
}