torsh-profiler 0.1.2

//! Apple Instruments profiling integration
//!
//! This module provides integration with Apple Instruments for comprehensive
//! performance analysis on macOS and iOS platforms, including time profiling,
//! allocations, leaks, and energy usage.

use crate::{ProfileEvent, TorshResult};
use serde::{Deserialize, Serialize};
use std::sync::{Arc, Mutex};
use std::time::{Duration, Instant};
use torsh_core::TorshError;

/// Apple Instruments profiling configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct InstrumentsConfig {
    /// Whether to enable os_signpost API
    pub signpost_enabled: bool,
    /// Whether to enable time profiling
    pub time_profiling: bool,
    /// Whether to enable allocations tracking
    pub allocations_tracking: bool,
    /// Whether to enable leaks detection
    pub leaks_detection: bool,
    /// Whether to enable energy usage tracking
    pub energy_tracking: bool,
    /// Whether to enable activity tracing
    pub activity_tracing: bool,
    /// Whether to enable system trace
    pub system_trace: bool,
    /// Sampling interval in microseconds
    pub sampling_interval_us: u64,
    /// Output directory for Instruments traces
    pub output_dir: Option<String>,
    /// Target device UDID (for iOS)
    pub device_udid: Option<String>,
}

impl Default for InstrumentsConfig {
    fn default() -> Self {
        Self {
            signpost_enabled: true,
            time_profiling: true,
            allocations_tracking: false,
            leaks_detection: false,
            energy_tracking: false,
            activity_tracing: true,
            system_trace: false,
            sampling_interval_us: 1000, // 1ms
            output_dir: None,
            device_udid: None,
        }
    }
}

/// Apple Instruments profiler
pub struct InstrumentsProfiler {
    config: InstrumentsConfig,
    events: Arc<Mutex<Vec<ProfileEvent>>>,
    start_time: Instant,
    enabled: bool,
    session_id: String,
    trace_id: u64,
}

impl InstrumentsProfiler {
    /// Create a new Instruments profiler
    pub fn new(config: InstrumentsConfig) -> Self {
        Self {
            config,
            events: Arc::new(Mutex::new(Vec::new())),
            start_time: Instant::now(),
            enabled: false,
            session_id: format!("instruments_session_{}", chrono::Utc::now().timestamp()),
            trace_id: 0,
        }
    }

    /// Enable Instruments profiling
    pub fn enable(&mut self) -> TorshResult<()> {
        self.enabled = true;
        self.start_time = Instant::now();
        self.trace_id += 1;

        if let Ok(mut events) = self.events.lock() {
            events.clear();
        }

        // Initialize os_signpost if enabled
        if self.config.signpost_enabled {
            self.init_signpost()?;
        }

        // Start Instruments trace
        self.start_instruments_trace()?;

        Ok(())
    }

    /// Disable Instruments profiling
    pub fn disable(&mut self) -> TorshResult<()> {
        self.enabled = false;

        // Stop Instruments trace
        self.stop_instruments_trace()?;

        // Finalize signpost if enabled
        if self.config.signpost_enabled {
            self.finalize_signpost()?;
        }

        Ok(())
    }

    /// Start an os_signpost interval
    pub fn start_signpost_interval(
        &self,
        name: &str,
        category: &str,
    ) -> TorshResult<SignpostInterval> {
        if !self.enabled || !self.config.signpost_enabled {
            return Ok(SignpostInterval::new_disabled());
        }

        let start_time = Instant::now();

        // In a real implementation, we would call os_signpost_interval_begin()
        let interval = SignpostInterval::new(name.to_string(), category.to_string(), start_time);

        Ok(interval)
    }

    /// Emit an os_signpost event
    pub fn emit_signpost_event(
        &self,
        name: &str,
        category: &str,
        message: &str,
    ) -> TorshResult<()> {
        if !self.enabled || !self.config.signpost_enabled {
            return Ok(());
        }

        let mut events = self.events.lock().map_err(|_| {
            TorshError::InvalidArgument("Failed to acquire lock on events".to_string())
        })?;

        let start_us = self.start_time.elapsed().as_micros() as u64;

        let event_name = format!("{name} [{category}]");

        let _metadata = format!(
            "{{\"session_id\": \"{}\", \"trace_id\": {}, \"message\": \"{}\"}}",
            self.session_id, self.trace_id, message
        );

        events.push(ProfileEvent {
            name: event_name,
            category: "instruments_signpost".to_string(),
            start_us,
            duration_us: 0, // Point event
            thread_id: format!("{:?}", std::thread::current().id())
                .parse()
                .unwrap_or(0),
            operation_count: Some(1),
            flops: Some(0),
            bytes_transferred: Some(0),
            stack_trace: None,
        });

        // In a real implementation, we would call os_signpost_event_emit()

        Ok(())
    }

    /// Record a time profile sample
    pub fn record_time_profile(
        &self,
        function_name: &str,
        file: &str,
        line: u32,
        duration: Duration,
        cpu_time: Option<Duration>,
        wall_time: Option<Duration>,
    ) -> TorshResult<()> {
        if !self.enabled || !self.config.time_profiling {
            return Ok(());
        }

        let mut events = self.events.lock().map_err(|_| {
            TorshError::InvalidArgument("Failed to acquire lock on events".to_string())
        })?;

        let start_us = self.start_time.elapsed().as_micros() as u64;
        let duration_us = duration.as_micros() as u64;

        let event_name = format!("{function_name}() [{file}:{line}]");

        let mut metadata = format!(
            "{{\"session_id\": \"{}\", \"trace_id\": {}",
            self.session_id, self.trace_id
        );

        if let Some(cpu) = cpu_time {
            metadata.push_str(&format!(", \"cpu_time_us\": {}", cpu.as_micros()));
        }

        if let Some(wall) = wall_time {
            metadata.push_str(&format!(", \"wall_time_us\": {}", wall.as_micros()));
        }

        metadata.push('}');

        events.push(ProfileEvent {
            name: event_name,
            category: "instruments_time".to_string(),
            start_us,
            duration_us,
            thread_id: format!("{:?}", std::thread::current().id())
                .parse()
                .unwrap_or(0),
            operation_count: Some(1),
            flops: Some(0),
            bytes_transferred: Some(0),
            stack_trace: None,
        });

        Ok(())
    }

    /// Record an allocation event
    pub fn record_allocation(
        &self,
        allocation_type: AllocationType,
        size: usize,
        address: Option<u64>,
        stack_trace: Option<&str>,
    ) -> TorshResult<()> {
        if !self.enabled || !self.config.allocations_tracking {
            return Ok(());
        }

        let mut events = self.events.lock().map_err(|_| {
            TorshError::InvalidArgument("Failed to acquire lock on events".to_string())
        })?;

        let start_us = self.start_time.elapsed().as_micros() as u64;

        let event_name = format!(
            "{:?} [{}{}]",
            allocation_type,
            if size < 1024 {
                format!("{size}B")
            } else if size < 1024 * 1024 {
                format!("{}KB", size / 1024)
            } else {
                format!("{}MB", size / (1024 * 1024))
            },
            address
                .map(|addr| format!(", 0x{addr:x}"))
                .unwrap_or_default()
        );

        let mut metadata = format!(
            "{{\"session_id\": \"{}\", \"trace_id\": {}, \"size\": {}",
            self.session_id, self.trace_id, size
        );

        if let Some(addr) = address {
            metadata.push_str(&format!(", \"address\": \"0x{addr:x}\""));
        }

        if let Some(trace) = stack_trace {
            metadata.push_str(&format!(
                ", \"stack_trace\": \"{}\"",
                trace.replace('"', "\\\"")
            ));
        }

        metadata.push('}');

        events.push(ProfileEvent {
            name: event_name,
            category: "instruments_allocation".to_string(),
            start_us,
            duration_us: 0, // Point event
            thread_id: format!("{:?}", std::thread::current().id())
                .parse()
                .unwrap_or(0),
            operation_count: Some(1),
            flops: Some(0),
            bytes_transferred: Some(size as u64),
            stack_trace: None,
        });

        Ok(())
    }

    /// Record an energy usage event
    pub fn record_energy_usage(
        &self,
        component: EnergyComponent,
        power_mw: f64,
        energy_mj: f64,
        duration: Duration,
    ) -> TorshResult<()> {
        if !self.enabled || !self.config.energy_tracking {
            return Ok(());
        }

        let mut events = self.events.lock().map_err(|_| {
            TorshError::InvalidArgument("Failed to acquire lock on events".to_string())
        })?;

        let start_us = self.start_time.elapsed().as_micros() as u64;
        let duration_us = duration.as_micros() as u64;

        let event_name = format!("{component:?} [{power_mw}mW, {energy_mj}mJ]");

        let _metadata = format!(
            "{{\"session_id\": \"{}\", \"trace_id\": {}, \"power_mw\": {}, \"energy_mj\": {}}}",
            self.session_id, self.trace_id, power_mw, energy_mj
        );

        events.push(ProfileEvent {
            name: event_name,
            category: "instruments_energy".to_string(),
            start_us,
            duration_us,
            thread_id: format!("{:?}", std::thread::current().id())
                .parse()
                .unwrap_or(0),
            operation_count: Some(1),
            flops: Some(0),
            bytes_transferred: Some(0),
            stack_trace: None,
        });

        Ok(())
    }

    /// Export Instruments profiling data
    pub fn export_instruments_data(&self, filename: &str) -> TorshResult<()> {
        let events = self.events.lock().map_err(|_| {
            TorshError::InvalidArgument("Failed to acquire lock on events".to_string())
        })?;

        let instruments_data = InstrumentsExportData {
            session_id: self.session_id.clone(),
            trace_id: self.trace_id,
            config: self.config.clone(),
            events: events.clone(),
            total_events: events.len(),
            total_duration_us: events.iter().map(|e| e.duration_us).sum(),
            timestamp: chrono::Utc::now(),
        };

        let json_data = serde_json::to_string_pretty(&instruments_data)
            .map_err(|e| TorshError::InvalidArgument(format!("Failed to serialize data: {e}")))?;

        std::fs::write(filename, json_data)
            .map_err(|e| TorshError::InvalidArgument(format!("Failed to write file: {e}")))?;

        Ok(())
    }

    /// Get Instruments profiling statistics
    pub fn get_instruments_stats(&self) -> TorshResult<InstrumentsStats> {
        let events = self.events.lock().map_err(|_| {
            TorshError::InvalidArgument("Failed to acquire lock on events".to_string())
        })?;

        let time_events: Vec<_> = events
            .iter()
            .filter(|e| e.category == "instruments_time")
            .collect();

        let allocation_events: Vec<_> = events
            .iter()
            .filter(|e| e.category == "instruments_allocation")
            .collect();

        let energy_events: Vec<_> = events
            .iter()
            .filter(|e| e.category == "instruments_energy")
            .collect();

        let signpost_events: Vec<_> = events
            .iter()
            .filter(|e| e.category == "instruments_signpost")
            .collect();

        let total_time_us: u64 = time_events.iter().map(|e| e.duration_us).sum();

        let total_allocations: usize = allocation_events.len();
        let total_allocated_bytes: usize = allocation_events
            .iter()
            .map(|e| e.bytes_transferred.unwrap_or(0) as usize)
            .sum();

        let avg_function_duration_us = if !time_events.is_empty() {
            total_time_us as f64 / time_events.len() as f64
        } else {
            0.0
        };

        Ok(InstrumentsStats {
            total_events: events.len(),
            time_events: time_events.len(),
            allocation_events: allocation_events.len(),
            energy_events: energy_events.len(),
            signpost_events: signpost_events.len(),
            total_time_us,
            total_allocations,
            total_allocated_bytes,
            avg_function_duration_us,
            session_id: self.session_id.clone(),
            trace_id: self.trace_id,
        })
    }

    // Private helper methods

    fn init_signpost(&self) -> TorshResult<()> {
        // In a real implementation, we would initialize os_signpost
        // os_log_create, os_signpost_id_generate, etc.
        Ok(())
    }

    fn finalize_signpost(&self) -> TorshResult<()> {
        // In a real implementation, we would finalize os_signpost
        Ok(())
    }

    fn start_instruments_trace(&self) -> TorshResult<()> {
        // In a real implementation, we would start Instruments tracing
        // via command line or Instruments API
        Ok(())
    }

    fn stop_instruments_trace(&self) -> TorshResult<()> {
        // In a real implementation, we would stop Instruments tracing
        // and save the trace file
        Ok(())
    }
}

/// os_signpost interval for profiling
pub struct SignpostInterval {
    name: String,
    category: String,
    start_time: Instant,
    enabled: bool,
}

impl SignpostInterval {
    fn new(name: String, category: String, start_time: Instant) -> Self {
        Self {
            name,
            category,
            start_time,
            enabled: true,
        }
    }

    fn new_disabled() -> Self {
        Self {
            name: String::new(),
            category: String::new(),
            start_time: Instant::now(),
            enabled: false,
        }
    }

    /// Get the duration of this interval
    pub fn duration(&self) -> Duration {
        self.start_time.elapsed()
    }

    /// Get the name of this interval
    pub fn name(&self) -> &str {
        &self.name
    }

    /// Get the category of this interval
    pub fn category(&self) -> &str {
        &self.category
    }
}

impl Drop for SignpostInterval {
    fn drop(&mut self) {
        if self.enabled {
            // In a real implementation, we would call os_signpost_interval_end()
        }
    }
}

/// Allocation types for Instruments analysis
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub enum AllocationType {
    Malloc,
    Calloc,
    Realloc,
    Free,
    New,
    Delete,
    MmapAnonymous,
    MmapFile,
    Munmap,
}

/// Energy components for Instruments analysis
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub enum EnergyComponent {
    CPU,
    GPU,
    ANE, // Apple Neural Engine
    Display,
    Network,
    Location,
    Camera,
    Bluetooth,
    WiFi,
    Cellular,
}

/// Instruments export data structure
#[derive(Debug, Serialize, Deserialize)]
pub struct InstrumentsExportData {
    pub session_id: String,
    pub trace_id: u64,
    pub config: InstrumentsConfig,
    pub events: Vec<ProfileEvent>,
    pub total_events: usize,
    pub total_duration_us: u64,
    pub timestamp: chrono::DateTime<chrono::Utc>,
}

/// Instruments profiling statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct InstrumentsStats {
    pub total_events: usize,
    pub time_events: usize,
    pub allocation_events: usize,
    pub energy_events: usize,
    pub signpost_events: usize,
    pub total_time_us: u64,
    pub total_allocations: usize,
    pub total_allocated_bytes: usize,
    pub avg_function_duration_us: f64,
    pub session_id: String,
    pub trace_id: u64,
}

/// Create a new Instruments profiler with default configuration
pub fn create_instruments_profiler() -> InstrumentsProfiler {
    InstrumentsProfiler::new(InstrumentsConfig::default())
}

/// Create a new Instruments profiler with custom configuration
pub fn create_instruments_profiler_with_config(config: InstrumentsConfig) -> InstrumentsProfiler {
    InstrumentsProfiler::new(config)
}

/// Export Instruments profiling data to JSON format
pub fn export_instruments_json(profiler: &InstrumentsProfiler, filename: &str) -> TorshResult<()> {
    profiler.export_instruments_data(filename)
}

/// Get Instruments profiling statistics
pub fn get_instruments_statistics(profiler: &InstrumentsProfiler) -> TorshResult<InstrumentsStats> {
    profiler.get_instruments_stats()
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::time::Duration;

    #[test]
    fn test_instruments_profiler_creation() {
        let profiler = create_instruments_profiler();
        assert!(!profiler.enabled);
    }

    #[test]
    fn test_instruments_profiler_enable_disable() {
        let mut profiler = create_instruments_profiler();
        assert!(profiler.enable().is_ok());
        assert!(profiler.enabled);
        assert!(profiler.disable().is_ok());
        assert!(!profiler.enabled);
    }

    #[test]
    #[ignore = "Flaky test - passes individually but may fail in full suite"]
    fn test_signpost_interval() {
        let mut profiler = create_instruments_profiler();
        profiler.enable().unwrap();
        let interval = profiler
            .start_signpost_interval("test_interval", "test_category")
            .unwrap();
        assert_eq!(interval.name(), "test_interval");
        assert_eq!(interval.category(), "test_category");
        assert!(interval.duration().as_nanos() > 0);
    }

    #[test]
    fn test_signpost_event() {
        let mut profiler = create_instruments_profiler();
        profiler.enable().unwrap();

        let result = profiler.emit_signpost_event("test_event", "test_category", "test message");

        assert!(result.is_ok());

        let stats = profiler.get_instruments_stats().unwrap();
        assert_eq!(stats.signpost_events, 1);
    }

    #[test]
    fn test_time_profile_recording() {
        let mut profiler = create_instruments_profiler();
        profiler.enable().unwrap();

        let result = profiler.record_time_profile(
            "test_function",
            "test.rs",
            42,
            Duration::from_micros(100),
            Some(Duration::from_micros(80)),
            Some(Duration::from_micros(120)),
        );

        assert!(result.is_ok());

        let stats = profiler.get_instruments_stats().unwrap();
        assert_eq!(stats.time_events, 1);
        assert_eq!(stats.total_time_us, 100);
    }

    #[test]
    fn test_allocation_recording() {
        let mut profiler = create_instruments_profiler();
        profiler.config.allocations_tracking = true;
        profiler.enable().unwrap();

        let result = profiler.record_allocation(
            AllocationType::Malloc,
            1024,
            Some(0x1000),
            Some("test_stack_trace"),
        );

        assert!(result.is_ok());

        let stats = profiler.get_instruments_stats().unwrap();
        assert_eq!(stats.allocation_events, 1);
        assert_eq!(stats.total_allocated_bytes, 1024);
    }

    #[test]
    fn test_energy_recording() {
        let mut profiler = create_instruments_profiler();
        profiler.config.energy_tracking = true;
        profiler.enable().unwrap();

        let result = profiler.record_energy_usage(
            EnergyComponent::CPU,
            1500.0, // 1.5W
            100.0,  // 100mJ
            Duration::from_millis(100),
        );

        assert!(result.is_ok());

        let stats = profiler.get_instruments_stats().unwrap();
        assert_eq!(stats.energy_events, 1);
    }

    #[test]
    fn test_export_instruments_data() {
        let mut profiler = create_instruments_profiler();
        profiler.enable().unwrap();

        profiler
            .record_time_profile(
                "test_function",
                "test.rs",
                42,
                Duration::from_micros(100),
                None,
                None,
            )
            .unwrap();

        let temp_file = std::env::temp_dir().join("test_instruments_export.json");
        let temp_str = temp_file.display().to_string();
        let result = profiler.export_instruments_data(&temp_str);
        assert!(result.is_ok());

        // Clean up
        let _ = std::fs::remove_file(&temp_file);
    }

    #[test]
    fn test_custom_config() {
        let config = InstrumentsConfig {
            signpost_enabled: false,
            time_profiling: false,
            allocations_tracking: true,
            leaks_detection: true,
            energy_tracking: true,
            activity_tracing: false,
            system_trace: true,
            sampling_interval_us: 500,
            output_dir: Some(
                std::env::temp_dir()
                    .join("instruments")
                    .display()
                    .to_string(),
            ),
            device_udid: Some("test-device-udid".to_string()),
        };

        let profiler = create_instruments_profiler_with_config(config.clone());
        assert_eq!(profiler.config.sampling_interval_us, 500);
        assert!(profiler.config.allocations_tracking);
        assert!(!profiler.config.signpost_enabled);
    }
}