use cm_dashboard_shared::{Metric, Status};
use std::time::Instant;

pub mod store;
pub mod subscription;

pub use store::MetricStore;

/// Widget types that can subscribe to metrics
#[derive(Debug, Clone, Copy, Hash, Eq, PartialEq)]
pub enum WidgetType {
    Cpu,
    Memory,
    Storage,
    Services,
    Backup,
    Hosts,
    Alerts,
}

/// Historical metric data point
#[derive(Debug, Clone)]
pub struct MetricDataPoint {
    pub metric: Metric,
    pub received_at: Instant,
}

/// Metric filtering and selection utilities
pub mod filter {
    use super::*;
    
    /// Filter metrics by widget type subscription
    pub fn filter_metrics_for_widget<'a>(
        metrics: &'a [Metric],
        subscriptions: &[String],
    ) -> Vec<&'a Metric> {
        metrics
            .iter()
            .filter(|metric| subscriptions.contains(&metric.name))
            .collect()
    }
    
    /// Get metrics by pattern matching
    pub fn filter_metrics_by_pattern<'a>(
        metrics: &'a [Metric],
        pattern: &str,
    ) -> Vec<&'a Metric> {
        if pattern.is_empty() {
            return metrics.iter().collect();
        }
        
        metrics
            .iter()
            .filter(|metric| metric.name.contains(pattern))
            .collect()
    }
    
    /// Aggregate status from multiple metrics
    pub fn aggregate_widget_status(metrics: &[&Metric]) -> Status {
        if metrics.is_empty() {
            return Status::Unknown;
        }
        
        let statuses: Vec<Status> = metrics.iter().map(|m| m.status).collect();
        Status::aggregate(&statuses)
    }
}

/// Widget metric subscription definitions
pub mod subscriptions {
    /// CPU widget metric subscriptions
    pub const CPU_WIDGET_METRICS: &[&str] = &[
        "cpu_load_1min",
        "cpu_load_5min", 
        "cpu_load_15min",
        "cpu_temperature_celsius",
        "cpu_frequency_mhz",
    ];
    
    /// Memory widget metric subscriptions
    pub const MEMORY_WIDGET_METRICS: &[&str] = &[
        "memory_usage_percent",
        "memory_total_gb",
        "memory_used_gb",
        "memory_available_gb",
        "memory_swap_total_gb",
        "memory_swap_used_gb",
        "disk_tmp_size_mb",
        "disk_tmp_total_mb", 
        "disk_tmp_usage_percent",
    ];
    
    /// Storage widget metric subscriptions 
    pub const STORAGE_WIDGET_METRICS: &[&str] = &[
        "disk_nvme0_temperature_celsius",
        "disk_nvme0_wear_percent",
        "disk_nvme0_spare_percent",
        "disk_nvme0_hours",
        "disk_nvme0_capacity_gb",
        "disk_nvme0_usage_gb",
        "disk_nvme0_usage_percent",
    ];
    
    /// Services widget metric subscriptions
    /// Note: Individual service metrics are dynamically discovered
    /// Pattern: "service_{name}_status" and "service_{name}_memory_mb"
    pub const SERVICES_WIDGET_METRICS: &[&str] = &[
        // Individual service metrics will be matched by pattern in the widget
        // e.g., "service_sshd_status", "service_nginx_status", etc.
    ];
    
    /// Backup widget metric subscriptions
    pub const BACKUP_WIDGET_METRICS: &[&str] = &[
        "backup_overall_status",
        "backup_duration_seconds",
        "backup_last_run_timestamp",
        "backup_total_services",
        "backup_total_repo_size_gb",
        "backup_services_completed_count",
        "backup_services_failed_count",
        "backup_services_disabled_count",
    ];
    
    /// Get all metric subscriptions for a widget type
    pub fn get_widget_subscriptions(widget_type: super::WidgetType) -> &'static [&'static str] {
        match widget_type {
            super::WidgetType::Cpu => CPU_WIDGET_METRICS,
            super::WidgetType::Memory => MEMORY_WIDGET_METRICS,
            super::WidgetType::Storage => STORAGE_WIDGET_METRICS,
            super::WidgetType::Services => SERVICES_WIDGET_METRICS,
            super::WidgetType::Backup => BACKUP_WIDGET_METRICS,
            super::WidgetType::Hosts => &[], // Hosts widget doesn't subscribe to specific metrics
            super::WidgetType::Alerts => &[], // Alerts widget aggregates from all metrics
        }
    }
}