trustformers-mobile 0.1.1

//! Android Doze Mode Compatibility
//!
//! This module provides comprehensive support for Android's Doze mode and App Standby,
//! ensuring TrustformeRS continues to function efficiently while respecting Android's
//! power optimization features introduced in Android 6.0 (API level 23) and later.

use crate::{
    android_work_manager::{
        AndroidWorkManager, WorkConstraintsConfig, WorkNetworkType, WorkRequest,
    },
    thermal_power::{PowerOptimizationStrategy, ThermalPowerConfig},
};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::{Duration, Instant};
use trustformers_core::error::{CoreError, Result};

/// Android Doze mode compatibility manager
pub struct AndroidDozeCompatibilityManager {
    config: DozeCompatibilityConfig,
    doze_detector: DozeStateDetector,
    whitelist_manager: WhitelistManager,
    deferred_task_scheduler: DeferredTaskScheduler,
    network_scheduler: NetworkScheduler,
    maintenance_window_manager: MaintenanceWindowManager,
    performance_adapter: DozePerformanceAdapter,
    stats: DozeCompatibilityStats,
}

/// Configuration for Doze mode compatibility
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DozeCompatibilityConfig {
    /// Enable Doze mode detection
    pub enable_doze_detection: bool,
    /// Enable automatic task deferral
    pub enable_task_deferral: bool,
    /// Enable network usage optimization
    pub enable_network_optimization: bool,
    /// Enable maintenance window scheduling
    pub enable_maintenance_windows: bool,
    /// Doze detection configuration
    pub detection_config: DozeDetectionConfig,
    /// Task scheduling configuration
    pub task_config: DozeTaskConfig,
    /// Network configuration
    pub network_config: DozeNetworkConfig,
    /// Performance configuration
    pub performance_config: DozePerformanceConfig,
}

/// Doze detection configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DozeDetectionConfig {
    /// Screen state monitoring interval (ms)
    pub screen_check_interval_ms: u64,
    /// Motion sensor monitoring interval (ms)
    pub motion_check_interval_ms: u64,
    /// Battery optimization check interval (ms)
    pub battery_optimization_check_ms: u64,
    /// Enable predictive Doze detection
    pub predictive_detection: bool,
}

/// Task scheduling configuration for Doze mode
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DozeTaskConfig {
    /// Maximum deferred tasks
    pub max_deferred_tasks: usize,
    /// Critical task threshold (ms)
    pub critical_task_threshold_ms: u64,
    /// Defer non-critical tasks
    pub defer_non_critical: bool,
    /// Enable task batching
    pub enable_task_batching: bool,
    /// Batch processing window (ms)
    pub batch_window_ms: u64,
}

/// Network configuration for Doze mode
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DozeNetworkConfig {
    /// Enable network request batching
    pub enable_request_batching: bool,
    /// Network request timeout during Doze (ms)
    pub doze_network_timeout_ms: u64,
    /// Enable offline mode fallback
    pub enable_offline_fallback: bool,
    /// Cache aggressive during Doze
    pub aggressive_caching: bool,
    /// Sync strategy during Doze
    pub doze_sync_strategy: DozeSyncStrategy,
}

/// Performance configuration for Doze mode
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DozePerformanceConfig {
    /// Reduce inference frequency during Doze
    pub reduce_inference_frequency: bool,
    /// Inference frequency reduction factor
    pub frequency_reduction_factor: f32,
    /// Enable background model unloading
    pub enable_model_unloading: bool,
    /// Model unload delay (ms)
    pub model_unload_delay_ms: u64,
    /// Memory pressure handling
    pub memory_pressure_handling: DozeMemoryStrategy,
}

/// Doze sync strategies
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum DozeSyncStrategy {
    /// Defer all sync operations
    Defer,
    /// Use maintenance windows only
    MaintenanceOnly,
    /// Critical sync only
    CriticalOnly,
    /// Disable sync completely
    Disabled,
}

/// Memory strategies during Doze mode
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum DozeMemoryStrategy {
    /// Aggressive memory cleanup
    Aggressive,
    /// Conservative cleanup
    Conservative,
    /// Minimal cleanup
    Minimal,
    /// No special handling
    None,
}

/// Doze state information
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum DozeState {
    /// Device is active
    Active,
    /// Device is entering Doze mode
    EnteringDoze,
    /// Device is in light Doze mode
    LightDoze,
    /// Device is in deep Doze mode
    DeepDoze,
    /// Device is in maintenance window
    MaintenanceWindow,
    /// App is in standby mode
    AppStandby,
}

/// Device state information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DeviceState {
    /// Current Doze state
    pub doze_state: DozeState,
    /// Screen state
    pub screen_on: bool,
    /// Device is plugged in
    pub plugged_in: bool,
    /// Device motion detected
    pub motion_detected: bool,
    /// Battery optimization enabled for app
    pub battery_optimization_enabled: bool,
    /// App is whitelisted
    pub app_whitelisted: bool,
    /// Network availability
    pub network_available: bool,
}

/// Deferred task information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DeferredTask {
    /// Task ID
    pub id: String,
    /// Task type
    pub task_type: DozeTaskType,
    /// Original schedule time
    pub scheduled_time: u64,
    /// Deferred time
    pub deferred_time: u64,
    /// Priority level
    pub priority: TaskPriority,
    /// Maximum deferral time (ms)
    pub max_deferral_ms: u64,
    /// Task payload
    pub payload: TaskPayload,
}

/// Types of tasks that can be deferred
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum DozeTaskType {
    /// Model inference
    Inference,
    /// Model update/download
    ModelUpdate,
    /// Data synchronization
    DataSync,
    /// Cache cleanup
    CacheCleanup,
    /// Analytics reporting
    Analytics,
    /// Background training
    BackgroundTraining,
}

/// Task priorities
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub enum TaskPriority {
    Critical,
    High,
    Normal,
    Low,
    Background,
}

/// Task payload data
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TaskPayload {
    /// Task data as bytes
    pub data: Vec<u8>,
    /// Task metadata
    pub metadata: HashMap<String, String>,
}

/// Maintenance window information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MaintenanceWindow {
    /// Window start time
    pub start_time: u64,
    /// Window duration (ms)
    pub duration_ms: u64,
    /// Window type
    pub window_type: MaintenanceWindowType,
    /// Scheduled tasks for this window
    pub scheduled_tasks: Vec<String>,
}

/// Types of maintenance windows
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum MaintenanceWindowType {
    /// System maintenance window
    System,
    /// User-initiated window
    User,
    /// Charging window
    Charging,
    /// Network available window
    Network,
}

/// Doze compatibility statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DozeCompatibilityStats {
    /// Total time in each Doze state (ms)
    pub time_in_states: HashMap<DozeState, u64>,
    /// Number of deferred tasks by type
    pub deferred_tasks_by_type: HashMap<DozeTaskType, u64>,
    /// Average deferral time by task type (ms)
    pub avg_deferral_time: HashMap<DozeTaskType, f64>,
    /// Network requests during Doze
    pub network_requests_during_doze: u64,
    /// Successful maintenance windows
    pub successful_maintenance_windows: u64,
    /// Battery saved (estimated mAh)
    pub estimated_battery_saved_mah: f64,
    /// Performance impact metrics
    pub performance_impact: DozePerformanceImpact,
}

/// Performance impact metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DozePerformanceImpact {
    /// Average inference delay due to Doze (ms)
    pub avg_inference_delay_ms: f64,
    /// Task completion rate during Doze
    pub task_completion_rate: f64,
    /// User-perceived performance impact
    pub user_impact_score: f64,
    /// Resource utilization efficiency
    pub resource_efficiency: f64,
}

impl Default for DozeCompatibilityConfig {
    fn default() -> Self {
        Self {
            enable_doze_detection: true,
            enable_task_deferral: true,
            enable_network_optimization: true,
            enable_maintenance_windows: true,
            detection_config: DozeDetectionConfig::default(),
            task_config: DozeTaskConfig::default(),
            network_config: DozeNetworkConfig::default(),
            performance_config: DozePerformanceConfig::default(),
        }
    }
}

impl Default for DozeDetectionConfig {
    fn default() -> Self {
        Self {
            screen_check_interval_ms: 5000,
            motion_check_interval_ms: 10000,
            battery_optimization_check_ms: 30000,
            predictive_detection: true,
        }
    }
}

impl Default for DozeTaskConfig {
    fn default() -> Self {
        Self {
            max_deferred_tasks: 100,
            critical_task_threshold_ms: 5000,
            defer_non_critical: true,
            enable_task_batching: true,
            batch_window_ms: 60000,
        }
    }
}

impl Default for DozeNetworkConfig {
    fn default() -> Self {
        Self {
            enable_request_batching: true,
            doze_network_timeout_ms: 30000,
            enable_offline_fallback: true,
            aggressive_caching: true,
            doze_sync_strategy: DozeSyncStrategy::MaintenanceOnly,
        }
    }
}

impl Default for DozePerformanceConfig {
    fn default() -> Self {
        Self {
            reduce_inference_frequency: true,
            frequency_reduction_factor: 0.5,
            enable_model_unloading: true,
            model_unload_delay_ms: 300000, // 5 minutes
            memory_pressure_handling: DozeMemoryStrategy::Conservative,
        }
    }
}

impl AndroidDozeCompatibilityManager {
    /// Create new Doze compatibility manager
    pub fn new(config: DozeCompatibilityConfig) -> Result<Self> {
        let doze_detector = DozeStateDetector::new(config.detection_config.clone())?;
        let whitelist_manager = WhitelistManager::new()?;
        let deferred_task_scheduler = DeferredTaskScheduler::new(config.task_config.clone())?;
        let network_scheduler = NetworkScheduler::new(config.network_config.clone())?;
        let maintenance_window_manager = MaintenanceWindowManager::new()?;
        let performance_adapter = DozePerformanceAdapter::new(config.performance_config.clone())?;
        let stats = DozeCompatibilityStats::new();

        Ok(Self {
            config,
            doze_detector,
            whitelist_manager,
            deferred_task_scheduler,
            network_scheduler,
            maintenance_window_manager,
            performance_adapter,
            stats,
        })
    }

    /// Start Doze compatibility monitoring
    pub fn start_monitoring(&mut self) -> Result<()> {
        if self.config.enable_doze_detection {
            self.doze_detector.start_monitoring()?;
        }

        tracing::info!("Doze compatibility monitoring started");
        Ok(())
    }

    /// Stop Doze compatibility monitoring
    pub fn stop_monitoring(&mut self) -> Result<()> {
        self.doze_detector.stop_monitoring()?;
        tracing::info!("Doze compatibility monitoring stopped");
        Ok(())
    }

    /// Get current device state
    pub fn get_device_state(&self) -> Result<DeviceState> {
        self.doze_detector.get_current_state()
    }

    /// Check if app should defer tasks
    pub fn should_defer_tasks(&self) -> Result<bool> {
        let state = self.get_device_state()?;

        match state.doze_state {
            DozeState::DeepDoze | DozeState::LightDoze => Ok(true),
            DozeState::AppStandby => Ok(true),
            DozeState::MaintenanceWindow => Ok(false),
            DozeState::Active => Ok(false),
            DozeState::EnteringDoze => Ok(self.config.task_config.defer_non_critical),
        }
    }

    /// Schedule task with Doze mode awareness
    pub fn schedule_doze_aware_task(&mut self, task: DeferredTask) -> Result<()> {
        if self.should_defer_tasks()? {
            self.deferred_task_scheduler.defer_task(task)?;
        } else {
            self.execute_task_immediately(task)?;
        }
        Ok(())
    }

    /// Execute inference with Doze mode optimization
    pub fn doze_aware_inference(&mut self, input_data: Vec<u8>) -> Result<InferenceResult> {
        let state = self.get_device_state()?;

        match state.doze_state {
            DozeState::DeepDoze => {
                // Defer inference or use cached results
                self.handle_doze_inference(input_data, true)
            },
            DozeState::LightDoze => {
                // Reduced frequency inference
                self.handle_doze_inference(input_data, false)
            },
            DozeState::AppStandby => {
                // Minimal inference capability
                self.handle_standby_inference(input_data)
            },
            _ => {
                // Normal inference
                self.handle_normal_inference(input_data)
            },
        }
    }

    /// Request network access with Doze awareness
    pub fn doze_aware_network_request(
        &mut self,
        request: NetworkRequest,
    ) -> Result<NetworkResponse> {
        let state = self.get_device_state()?;

        if matches!(state.doze_state, DozeState::DeepDoze | DozeState::LightDoze) {
            self.network_scheduler.schedule_doze_request(request)
        } else {
            self.network_scheduler.execute_immediate_request(request)
        }
    }

    /// Get next maintenance window
    pub fn get_next_maintenance_window(&self) -> Result<Option<MaintenanceWindow>> {
        self.maintenance_window_manager.get_next_window()
    }

    /// Request whitelist exemption
    pub fn request_whitelist_exemption(&mut self, reason: WhitelistReason) -> Result<bool> {
        self.whitelist_manager.request_exemption(reason)
    }

    /// Get Doze compatibility statistics
    pub fn get_stats(&self) -> &DozeCompatibilityStats {
        &self.stats
    }

    /// Optimize performance for current Doze state
    pub fn optimize_for_doze_state(&mut self) -> Result<()> {
        let state = self.get_device_state()?;
        self.performance_adapter.adapt_to_state(state.doze_state)?;
        Ok(())
    }

    // Private helper methods

    fn execute_task_immediately(&mut self, task: DeferredTask) -> Result<()> {
        // Execute task based on type
        match task.task_type {
            DozeTaskType::Inference => self.execute_inference_task(&task),
            DozeTaskType::ModelUpdate => self.execute_model_update_task(&task),
            DozeTaskType::DataSync => self.execute_sync_task(&task),
            DozeTaskType::CacheCleanup => self.execute_cleanup_task(&task),
            DozeTaskType::Analytics => self.execute_analytics_task(&task),
            DozeTaskType::BackgroundTraining => self.execute_training_task(&task),
        }
    }

    fn handle_doze_inference(
        &self,
        _input_data: Vec<u8>,
        _deep_doze: bool,
    ) -> Result<InferenceResult> {
        // Handle inference during Doze mode
        Ok(InferenceResult {
            result: vec![],
            cached: true,
            processing_time_ms: 0.0,
        })
    }

    fn handle_standby_inference(&self, _input_data: Vec<u8>) -> Result<InferenceResult> {
        // Handle inference during App Standby
        Ok(InferenceResult {
            result: vec![],
            cached: true,
            processing_time_ms: 0.0,
        })
    }

    fn handle_normal_inference(&self, _input_data: Vec<u8>) -> Result<InferenceResult> {
        // Handle normal inference
        Ok(InferenceResult {
            result: vec![],
            cached: false,
            processing_time_ms: 0.0,
        })
    }

    fn execute_inference_task(&self, _task: &DeferredTask) -> Result<()> {
        // Execute inference task
        Ok(())
    }

    fn execute_model_update_task(&self, _task: &DeferredTask) -> Result<()> {
        // Execute model update task
        Ok(())
    }

    fn execute_sync_task(&self, _task: &DeferredTask) -> Result<()> {
        // Execute sync task
        Ok(())
    }

    fn execute_cleanup_task(&self, _task: &DeferredTask) -> Result<()> {
        // Execute cleanup task
        Ok(())
    }

    fn execute_analytics_task(&self, _task: &DeferredTask) -> Result<()> {
        // Execute analytics task
        Ok(())
    }

    fn execute_training_task(&self, _task: &DeferredTask) -> Result<()> {
        // Execute training task
        Ok(())
    }
}

/// Doze state detector
struct DozeStateDetector {
    config: DozeDetectionConfig,
    current_state: DozeState,
    last_screen_check: Instant,
    last_motion_check: Instant,
    monitoring_active: bool,
}

impl DozeStateDetector {
    fn new(config: DozeDetectionConfig) -> Result<Self> {
        Ok(Self {
            config,
            current_state: DozeState::Active,
            last_screen_check: Instant::now(),
            last_motion_check: Instant::now(),
            monitoring_active: false,
        })
    }

    fn start_monitoring(&mut self) -> Result<()> {
        self.monitoring_active = true;
        Ok(())
    }

    fn stop_monitoring(&mut self) -> Result<()> {
        self.monitoring_active = false;
        Ok(())
    }

    fn get_current_state(&self) -> Result<DeviceState> {
        // This would integrate with Android APIs to detect actual state
        Ok(DeviceState {
            doze_state: self.current_state,
            screen_on: true,
            plugged_in: false,
            motion_detected: true,
            battery_optimization_enabled: false,
            app_whitelisted: false,
            network_available: true,
        })
    }
}

/// Whitelist manager for battery optimization exemptions
struct WhitelistManager {
    exemption_requested: bool,
}

impl WhitelistManager {
    fn new() -> Result<Self> {
        Ok(Self {
            exemption_requested: false,
        })
    }

    fn request_exemption(&mut self, _reason: WhitelistReason) -> Result<bool> {
        // Request battery optimization exemption
        self.exemption_requested = true;
        Ok(false) // Placeholder
    }
}

/// Reasons for requesting whitelist exemption
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum WhitelistReason {
    CriticalInference,
    RealTimeProcessing,
    UserInteraction,
    SafetyApplication,
}

/// Deferred task scheduler
struct DeferredTaskScheduler {
    config: DozeTaskConfig,
    deferred_tasks: Vec<DeferredTask>,
}

impl DeferredTaskScheduler {
    fn new(config: DozeTaskConfig) -> Result<Self> {
        Ok(Self {
            config,
            deferred_tasks: Vec::new(),
        })
    }

    fn defer_task(&mut self, task: DeferredTask) -> Result<()> {
        if self.deferred_tasks.len() >= self.config.max_deferred_tasks {
            // Remove oldest low-priority task
            self.remove_lowest_priority_task();
        }

        self.deferred_tasks.push(task);
        Ok(())
    }

    fn remove_lowest_priority_task(&mut self) {
        if let Some(index) = self.find_lowest_priority_task_index() {
            self.deferred_tasks.remove(index);
        }
    }

    fn find_lowest_priority_task_index(&self) -> Option<usize> {
        self.deferred_tasks
            .iter()
            .enumerate()
            .min_by_key(|(_, task)| task.priority)
            .map(|(index, _)| index)
    }
}

/// Network scheduler for Doze mode
struct NetworkScheduler {
    config: DozeNetworkConfig,
    pending_requests: Vec<NetworkRequest>,
}

impl NetworkScheduler {
    fn new(config: DozeNetworkConfig) -> Result<Self> {
        Ok(Self {
            config,
            pending_requests: Vec::new(),
        })
    }

    fn schedule_doze_request(&mut self, request: NetworkRequest) -> Result<NetworkResponse> {
        self.pending_requests.push(request);
        // Return cached or deferred response
        Ok(NetworkResponse {
            data: vec![],
            cached: true,
            timestamp: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .expect("SystemTime should be after UNIX_EPOCH")
                .as_secs(),
        })
    }

    fn execute_immediate_request(&self, _request: NetworkRequest) -> Result<NetworkResponse> {
        // Execute network request immediately
        Ok(NetworkResponse {
            data: vec![],
            cached: false,
            timestamp: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .expect("SystemTime should be after UNIX_EPOCH")
                .as_secs(),
        })
    }
}

/// Maintenance window manager
struct MaintenanceWindowManager {
    upcoming_windows: Vec<MaintenanceWindow>,
}

impl MaintenanceWindowManager {
    fn new() -> Result<Self> {
        Ok(Self {
            upcoming_windows: Vec::new(),
        })
    }

    fn get_next_window(&self) -> Result<Option<MaintenanceWindow>> {
        Ok(self.upcoming_windows.first().cloned())
    }
}

/// Performance adapter for Doze mode
struct DozePerformanceAdapter {
    config: DozePerformanceConfig,
    current_adaptations: Vec<PerformanceAdaptation>,
}

impl DozePerformanceAdapter {
    fn new(config: DozePerformanceConfig) -> Result<Self> {
        Ok(Self {
            config,
            current_adaptations: Vec::new(),
        })
    }

    fn adapt_to_state(&mut self, state: DozeState) -> Result<()> {
        self.clear_adaptations();

        match state {
            DozeState::DeepDoze => {
                self.apply_deep_doze_adaptations()?;
            },
            DozeState::LightDoze => {
                self.apply_light_doze_adaptations()?;
            },
            DozeState::AppStandby => {
                self.apply_standby_adaptations()?;
            },
            _ => {
                self.apply_normal_adaptations()?;
            },
        }

        Ok(())
    }

    fn clear_adaptations(&mut self) {
        self.current_adaptations.clear();
    }

    fn apply_deep_doze_adaptations(&mut self) -> Result<()> {
        // Apply aggressive power optimizations
        self.current_adaptations.push(PerformanceAdaptation::ReduceInferenceFrequency);
        self.current_adaptations.push(PerformanceAdaptation::UnloadModels);
        self.current_adaptations.push(PerformanceAdaptation::AggressiveMemoryCleanup);
        Ok(())
    }

    fn apply_light_doze_adaptations(&mut self) -> Result<()> {
        // Apply moderate optimizations
        self.current_adaptations.push(PerformanceAdaptation::ReduceInferenceFrequency);
        self.current_adaptations.push(PerformanceAdaptation::ConservativeMemoryCleanup);
        Ok(())
    }

    fn apply_standby_adaptations(&mut self) -> Result<()> {
        // Apply minimal optimizations
        self.current_adaptations.push(PerformanceAdaptation::MinimalMemoryCleanup);
        Ok(())
    }

    fn apply_normal_adaptations(&mut self) -> Result<()> {
        // No special adaptations needed
        Ok(())
    }
}

/// Performance adaptations
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum PerformanceAdaptation {
    ReduceInferenceFrequency,
    UnloadModels,
    AggressiveMemoryCleanup,
    ConservativeMemoryCleanup,
    MinimalMemoryCleanup,
}

/// Network request structure
#[derive(Debug, Clone)]
pub struct NetworkRequest {
    pub url: String,
    pub method: String,
    pub headers: HashMap<String, String>,
    pub body: Option<Vec<u8>>,
    pub timeout_ms: u64,
}

/// Network response structure
#[derive(Debug, Clone)]
pub struct NetworkResponse {
    pub data: Vec<u8>,
    pub cached: bool,
    pub timestamp: u64,
}

/// Inference result structure
#[derive(Debug, Clone)]
pub struct InferenceResult {
    pub result: Vec<u8>,
    pub cached: bool,
    pub processing_time_ms: f64,
}

impl DozeCompatibilityStats {
    fn new() -> Self {
        Self {
            time_in_states: HashMap::new(),
            deferred_tasks_by_type: HashMap::new(),
            avg_deferral_time: HashMap::new(),
            network_requests_during_doze: 0,
            successful_maintenance_windows: 0,
            estimated_battery_saved_mah: 0.0,
            performance_impact: DozePerformanceImpact {
                avg_inference_delay_ms: 0.0,
                task_completion_rate: 1.0,
                user_impact_score: 0.0,
                resource_efficiency: 1.0,
            },
        }
    }
}

/// Utility functions for Doze compatibility
pub struct DozeCompatibilityUtils;

impl DozeCompatibilityUtils {
    /// Check if device supports Doze mode
    pub fn supports_doze_mode() -> bool {
        // Check Android API level (Doze introduced in API 23)
        true // Placeholder
    }

    /// Get recommended configuration for device
    pub fn get_recommended_config() -> DozeCompatibilityConfig {
        DozeCompatibilityConfig::default()
    }

    /// Estimate battery savings from Doze mode
    pub fn estimate_battery_savings(stats: &DozeCompatibilityStats) -> f64 {
        stats.estimated_battery_saved_mah
    }

    /// Get user impact assessment
    pub fn assess_user_impact(stats: &DozeCompatibilityStats) -> UserImpactLevel {
        if stats.performance_impact.user_impact_score < 0.1 {
            UserImpactLevel::Minimal
        } else if stats.performance_impact.user_impact_score < 0.3 {
            UserImpactLevel::Low
        } else if stats.performance_impact.user_impact_score < 0.6 {
            UserImpactLevel::Moderate
        } else {
            UserImpactLevel::High
        }
    }
}

/// User impact levels
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum UserImpactLevel {
    Minimal,
    Low,
    Moderate,
    High,
}

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

    #[test]
    fn test_doze_compatibility_manager_creation() {
        let config = DozeCompatibilityConfig::default();
        let manager = AndroidDozeCompatibilityManager::new(config);
        assert!(manager.is_ok());
    }

    #[test]
    fn test_doze_state_transitions() {
        let states = [
            DozeState::Active,
            DozeState::EnteringDoze,
            DozeState::LightDoze,
            DozeState::DeepDoze,
            DozeState::MaintenanceWindow,
            DozeState::AppStandby,
        ];

        for state in states {
            assert_ne!(state, DozeState::Active); // Just a basic check
        }
    }

    #[test]
    fn test_task_priority_ordering() {
        let mut priorities = vec![
            TaskPriority::Background,
            TaskPriority::Critical,
            TaskPriority::Normal,
            TaskPriority::High,
            TaskPriority::Low,
        ];

        priorities.sort();

        assert_eq!(priorities[0], TaskPriority::Critical);
        assert_eq!(priorities[4], TaskPriority::Background);
    }

    #[test]
    fn test_doze_compatibility_utils() {
        assert!(DozeCompatibilityUtils::supports_doze_mode());

        let config = DozeCompatibilityUtils::get_recommended_config();
        assert!(config.enable_doze_detection);
    }
}