revoke-cli 0.3.0

use anyhow::{Result, Context};
use colored::Colorize;
use tabled::{Table, Tabled, settings::Style};
use serde::{Serialize, Deserialize};
use std::time::Duration;
use crate::config::Config;
use crate::commands::HealthCommands;
use crate::utils::{print_success, print_error, print_info};

#[derive(Tabled, Serialize, Deserialize)]
struct HealthRow {
    #[tabled(rename = "Component")]
    component: String,
    #[tabled(rename = "Status")]
    status: String,
    #[tabled(rename = "Response Time")]
    response_time: String,
    #[tabled(rename = "Details")]
    details: String,
}

pub async fn handle_command(command: HealthCommands, config: &Config) -> Result<()> {
    match command {
        HealthCommands::Check { detailed } => {
            check_system_health(detailed, config).await?
        }
        HealthCommands::Service { name } => {
            check_service_health(&name, config).await?
        }
        HealthCommands::Monitor { interval, services } => {
            monitor_health(interval, services, config).await?
        }
    }
    
    Ok(())
}

async fn check_system_health(detailed: bool, config: &Config) -> Result<()> {
    print_info("Checking system health...");
    
    // In a real implementation, this would check actual components
    let components = vec![
        HealthRow {
            component: "Consul".to_string(),
            status: "healthy".green().to_string(),
            response_time: "5ms".to_string(),
            details: "Version 1.17.0, 3 nodes".to_string(),
        },
        HealthRow {
            component: "Gateway".to_string(),
            status: "healthy".green().to_string(),
            response_time: "2ms".to_string(),
            details: "Uptime: 7d 14h 23m".to_string(),
        },
        HealthRow {
            component: "User Service".to_string(),
            status: "healthy".green().to_string(),
            response_time: "12ms".to_string(),
            details: "3/3 instances healthy".to_string(),
        },
        HealthRow {
            component: "Order Service".to_string(),
            status: "degraded".yellow().to_string(),
            response_time: "145ms".to_string(),
            details: "2/3 instances healthy".to_string(),
        },
        HealthRow {
            component: "Database".to_string(),
            status: "healthy".green().to_string(),
            response_time: "8ms".to_string(),
            details: "Primary: OK, Replica lag: 0.2s".to_string(),
        },
    ];
    
    println!("\n{}", "System Health Status".bold());
    println!("{}", "=".repeat(80));
    
    let table = Table::new(&components)
        .with(Style::modern())
        .to_string();
    println!("{}", table);
    
    // Calculate overall status
    let unhealthy_count = components.iter()
        .filter(|c| c.status.contains("unhealthy"))
        .count();
    let degraded_count = components.iter()
        .filter(|c| c.status.contains("degraded"))
        .count();
    
    println!("\n{}", "Overall Status".bold());
    println!("{}", "-".repeat(40));
    
    if unhealthy_count > 0 {
        println!("{}: {} ({})", 
            "Status".bold(), 
            "UNHEALTHY".red().bold(),
            format!("{} components down", unhealthy_count)
        );
    } else if degraded_count > 0 {
        println!("{}: {} ({})", 
            "Status".bold(), 
            "DEGRADED".yellow().bold(),
            format!("{} components degraded", degraded_count)
        );
    } else {
        println!("{}: {}", 
            "Status".bold(), 
            "HEALTHY".green().bold()
        );
    }
    
    if detailed {
        println!("\n{}", "Detailed Information".bold());
        println!("{}", "-".repeat(40));
        
        // Additional detailed checks
        println!("Resource Usage:");
        println!("  CPU Usage: {}%", "23".green());
        println!("  Memory Usage: {}%", "67".yellow());
        println!("  Disk Usage: {}%", "45".green());
        
        println!("\nRecent Issues:");
        println!("  - Order Service instance 3 failed health check (5 minutes ago)");
        println!("  - Database replica lag spike detected (2 hours ago)");
    }
    
    Ok(())
}

async fn check_service_health(service_name: &str, config: &Config) -> Result<()> {
    print_info(&format!("Checking health for service: {}", service_name));
    
    // In a real implementation, this would check the specific service
    println!("\n{}", format!("Health Status for '{}'", service_name).bold());
    println!("{}", "=".repeat(50));
    
    println!("{}: {}", "Status".bold(), "healthy".green().bold());
    println!("{}: {}", "Instances".bold(), "3/3 healthy");
    println!("{}: {}", "Average Response Time".bold(), "45ms");
    println!("{}: {}", "Success Rate".bold(), "99.8%");
    println!("{}: {}", "Uptime".bold(), "14d 7h 23m");
    
    println!("\n{}", "Instance Details".bold());
    println!("{}", "-".repeat(50));
    
    let instances = vec![
        ("instance-1", "172.16.0.10:8080", "healthy", "12ms"),
        ("instance-2", "172.16.0.11:8080", "healthy", "15ms"),
        ("instance-3", "172.16.0.12:8080", "healthy", "18ms"),
    ];
    
    for (id, address, status, response_time) in instances {
        let status_colored = if status == "healthy" {
            status.green().to_string()
        } else {
            status.red().to_string()
        };
        
        println!("  {} @ {} - {} ({})", id, address, status_colored, response_time);
    }
    
    println!("\n{}", "Recent Health Checks".bold());
    println!("{}", "-".repeat(50));
    println!("  {} - {} (12ms)", 
        chrono::Local::now().format("%H:%M:%S"),
        "passed".green()
    );
    println!("  {} - {} (14ms)", 
        (chrono::Local::now() - chrono::Duration::seconds(30)).format("%H:%M:%S"),
        "passed".green()
    );
    println!("  {} - {} (13ms)", 
        (chrono::Local::now() - chrono::Duration::seconds(60)).format("%H:%M:%S"),
        "passed".green()
    );
    
    Ok(())
}

async fn monitor_health(
    interval: u64,
    services: Vec<String>,
    config: &Config,
) -> Result<()> {
    use tokio::time;
    use std::io::{self, Write};
    
    let services_to_monitor = if services.is_empty() {
        vec![
            "gateway".to_string(),
            "user-service".to_string(),
            "order-service".to_string(),
        ]
    } else {
        services
    };
    
    print_info(&format!(
        "Monitoring health for: {} (updating every {}s)",
        services_to_monitor.join(", "),
        interval
    ));
    println!("Press Ctrl+C to stop monitoring\n");
    
    let mut interval_timer = time::interval(Duration::from_secs(interval));
    
    loop {
        // Clear screen
        print!("\x1B[2J\x1B[1;1H");
        io::stdout().flush()?;
        
        println!("{}", "Health Monitor".bold());
        println!("{}: {}", "Time".bold(), chrono::Local::now().format("%Y-%m-%d %H:%M:%S"));
        println!("{}", "=".repeat(80));
        
        for service in &services_to_monitor {
            // In a real implementation, this would check actual service health
            let (status, response_time, instances) = match service.as_str() {
                "gateway" => ("healthy", "2ms", "1/1"),
                "user-service" => ("healthy", "15ms", "3/3"),
                "order-service" => ("degraded", "145ms", "2/3"),
                _ => ("unknown", "N/A", "0/0"),
            };
            
            let status_colored = match status {
                "healthy" => status.green().bold(),
                "degraded" => status.yellow().bold(),
                "unhealthy" => status.red().bold(),
                _ => status.dimmed(),
            };
            
            println!("{:.<30} {} ({}, {})", 
                format!("{} ", service),
                status_colored,
                response_time,
                instances
            );
        }
        
        println!("\n{}", format!("Next update in {} seconds...", interval).dimmed());
        
        interval_timer.tick().await;
    }
}