mielin-cli 0.1.0-rc.1

//! Monitoring command implementations

use crate::output::OutputFormat;
use crate::progress::with_spinner;
use anyhow::Result;
use clap::{Args, Subcommand};
use comfy_table::{presets::UTF8_FULL, Cell, Color, ContentArrangement, Table};
use serde::{Deserialize, Serialize};
use std::path::PathBuf;
use std::time::Duration;

/// Monitoring commands
#[derive(Debug, Args)]
pub struct MonitorCommand {
    #[command(subcommand)]
    command: MonitorSubcommand,
}

#[derive(Debug, Subcommand)]
enum MonitorSubcommand {
    /// Real-time resource monitoring (like top)
    #[command(visible_aliases = &["resources", "htop"])]
    Top {
        /// Refresh interval in seconds
        #[arg(short = 'i', long, default_value = "2")]
        interval: u64,

        /// Number of iterations (0 = infinite)
        #[arg(short = 'n', long, default_value = "0")]
        iterations: u64,

        /// Sort by field (cpu, memory, name)
        #[arg(short = 's', long, default_value = "cpu")]
        sort_by: String,

        /// Filter by agent name pattern
        #[arg(short = 'f', long)]
        filter: Option<String>,
    },

    /// Watch command output (refresh periodically)
    #[command(visible_aliases = &["repeat", "poll"])]
    Watch {
        /// Command to watch (e.g., "node list")
        command: Vec<String>,

        /// Refresh interval in seconds
        #[arg(short = 'i', long, default_value = "2")]
        interval: u64,

        /// Number of iterations (0 = infinite)
        #[arg(short = 'n', long, default_value = "0")]
        iterations: u64,

        /// Highlight differences between iterations
        #[arg(short = 'd', long)]
        differences: bool,
    },

    /// Stream events from the system
    #[command(visible_aliases = &["stream", "log", "tail"])]
    Events {
        /// Filter by event type
        #[arg(short = 't', long)]
        event_type: Option<String>,

        /// Filter by agent ID
        #[arg(short = 'a', long)]
        agent: Option<String>,

        /// Filter by node ID
        #[arg(short = 'n', long)]
        node: Option<String>,

        /// Follow mode (stream continuously)
        #[arg(short = 'f', long)]
        follow: bool,

        /// Show last N events
        #[arg(short = 'l', long, default_value = "50")]
        limit: usize,

        /// Output to file
        #[arg(short = 'o', long)]
        output: Option<PathBuf>,
    },

    /// Show system metrics dashboard
    #[command(visible_aliases = &["dash", "overview"])]
    Dashboard {
        /// Refresh interval in seconds
        #[arg(short = 'i', long, default_value = "5")]
        interval: u64,

        /// Output format
        #[arg(short = 'o', long, value_enum)]
        output: Option<OutputFormat>,
    },
}

impl MonitorCommand {
    pub async fn execute(&self, output_format: OutputFormat) -> Result<()> {
        match &self.command {
            MonitorSubcommand::Top {
                interval,
                iterations,
                sort_by,
                filter,
            } => {
                top_command(
                    *interval,
                    *iterations,
                    sort_by,
                    filter.as_deref(),
                    output_format,
                )
                .await
            }
            MonitorSubcommand::Watch {
                command,
                interval,
                iterations,
                differences,
            } => watch_command(command, *interval, *iterations, *differences).await,
            MonitorSubcommand::Events {
                event_type,
                agent,
                node,
                follow,
                limit,
                output,
            } => {
                events_command(
                    event_type.as_deref(),
                    agent.as_deref(),
                    node.as_deref(),
                    *follow,
                    *limit,
                    output.as_ref(),
                    output_format,
                )
                .await
            }
            MonitorSubcommand::Dashboard { interval, output } => {
                let format = output.unwrap_or(output_format);
                dashboard_command(*interval, format).await
            }
        }
    }
}

/// Resource monitoring data
#[derive(Debug, Clone, Serialize, Deserialize)]
struct ResourceSnapshot {
    timestamp: chrono::DateTime<chrono::Utc>,
    agents: Vec<AgentResource>,
    system: SystemResource,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct AgentResource {
    id: String,
    name: String,
    cpu_percent: f64,
    memory_mb: f64,
    network_kbps: f64,
    status: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct SystemResource {
    total_cpu_percent: f64,
    total_memory_mb: f64,
    total_memory_used_mb: f64,
    total_agents: usize,
    active_agents: usize,
}

async fn top_command(
    interval: u64,
    iterations: u64,
    sort_by: &str,
    filter: Option<&str>,
    format: OutputFormat,
) -> Result<()> {
    with_spinner("Initializing resource monitor", async {
        tokio::time::sleep(Duration::from_millis(500)).await;
        Ok::<(), anyhow::Error>(())
    })
    .await?;

    let mut iteration = 0u64;

    loop {
        let mut snapshot = fetch_resource_snapshot().await?;

        // Filter agents if pattern provided
        if let Some(pattern) = filter {
            snapshot
                .agents
                .retain(|a| a.name.contains(pattern) || a.id.contains(pattern));
        }

        // Sort agents
        match sort_by {
            "cpu" => snapshot
                .agents
                .sort_by(|a, b| b.cpu_percent.partial_cmp(&a.cpu_percent).unwrap()),
            "memory" => snapshot
                .agents
                .sort_by(|a, b| b.memory_mb.partial_cmp(&a.memory_mb).unwrap()),
            "name" => snapshot.agents.sort_by(|a, b| a.name.cmp(&b.name)),
            _ => {}
        }

        // Clear screen for top-like display (only in table mode)
        if matches!(format, OutputFormat::Table) {
            print!("\x1B[2J\x1B[1;1H"); // Clear screen and move cursor to top
        }

        // Display snapshot
        display_resource_snapshot(&snapshot, format)?;

        iteration += 1;
        if iterations > 0 && iteration >= iterations {
            break;
        }

        // Wait for next iteration
        tokio::time::sleep(Duration::from_secs(interval)).await;
    }

    Ok(())
}

async fn fetch_resource_snapshot() -> Result<ResourceSnapshot> {
    // Stub implementation - would fetch actual data from daemon
    use rand::Rng;
    let mut rng = rand::rng();

    let agents = vec![
        AgentResource {
            id: "agent-001".to_string(),
            name: "web-server".to_string(),
            cpu_percent: rng.random_range(5.0..95.0),
            memory_mb: rng.random_range(50.0..500.0),
            network_kbps: rng.random_range(10.0..1000.0),
            status: "Running".to_string(),
        },
        AgentResource {
            id: "agent-002".to_string(),
            name: "database".to_string(),
            cpu_percent: rng.random_range(5.0..95.0),
            memory_mb: rng.random_range(100.0..800.0),
            network_kbps: rng.random_range(10.0..1000.0),
            status: "Running".to_string(),
        },
        AgentResource {
            id: "agent-003".to_string(),
            name: "cache".to_string(),
            cpu_percent: rng.random_range(5.0..95.0),
            memory_mb: rng.random_range(20.0..200.0),
            network_kbps: rng.random_range(10.0..1000.0),
            status: "Running".to_string(),
        },
    ];

    let total_cpu = agents.iter().map(|a| a.cpu_percent).sum::<f64>() / agents.len() as f64;
    let total_memory_used = agents.iter().map(|a| a.memory_mb).sum::<f64>();

    Ok(ResourceSnapshot {
        timestamp: chrono::Utc::now(),
        agents,
        system: SystemResource {
            total_cpu_percent: total_cpu,
            total_memory_mb: 16384.0,
            total_memory_used_mb: total_memory_used,
            total_agents: 3,
            active_agents: 3,
        },
    })
}

fn display_resource_snapshot(snapshot: &ResourceSnapshot, format: OutputFormat) -> Result<()> {
    match format {
        OutputFormat::Json => {
            println!("{}", serde_json::to_string_pretty(&snapshot)?);
        }
        OutputFormat::Yaml => {
            println!("{}", serde_yaml::to_string(&snapshot)?);
        }
        OutputFormat::Quiet => {
            for agent in &snapshot.agents {
                println!("{}", agent.id);
            }
        }
        OutputFormat::Table => {
            // System summary
            println!(
                "MielinOS Resource Monitor - {}",
                snapshot.timestamp.format("%H:%M:%S")
            );
            println!(
                "Agents: {} total, {} active | CPU: {:.1}% | Memory: {:.1}/{:.1} MB ({:.1}%)",
                snapshot.system.total_agents,
                snapshot.system.active_agents,
                snapshot.system.total_cpu_percent,
                snapshot.system.total_memory_used_mb,
                snapshot.system.total_memory_mb,
                (snapshot.system.total_memory_used_mb / snapshot.system.total_memory_mb) * 100.0
            );
            println!();

            // Agent table
            let mut table = Table::new();
            table
                .load_preset(UTF8_FULL)
                .set_content_arrangement(ContentArrangement::Dynamic)
                .set_header(vec![
                    "ID",
                    "Name",
                    "Status",
                    "CPU %",
                    "Memory (MB)",
                    "Network (KB/s)",
                ]);

            for agent in &snapshot.agents {
                let cpu_cell = if agent.cpu_percent > 80.0 {
                    Cell::new(format!("{:.1}", agent.cpu_percent)).fg(Color::Red)
                } else if agent.cpu_percent > 50.0 {
                    Cell::new(format!("{:.1}", agent.cpu_percent)).fg(Color::Yellow)
                } else {
                    Cell::new(format!("{:.1}", agent.cpu_percent)).fg(Color::Green)
                };

                let status_cell = if agent.status == "Running" {
                    Cell::new(&agent.status).fg(Color::Green)
                } else {
                    Cell::new(&agent.status).fg(Color::Red)
                };

                table.add_row(vec![
                    Cell::new(&agent.id),
                    Cell::new(&agent.name),
                    status_cell,
                    cpu_cell,
                    Cell::new(format!("{:.1}", agent.memory_mb)),
                    Cell::new(format!("{:.1}", agent.network_kbps)),
                ]);
            }

            println!("{}", table);
        }
    }

    Ok(())
}

async fn watch_command(
    command: &[String],
    interval: u64,
    iterations: u64,
    differences: bool,
) -> Result<()> {
    println!("Watching command: {}", command.join(" "));
    println!("Interval: {}s, Press Ctrl+C to stop", interval);
    println!();

    let mut iteration = 0u64;
    let mut previous_output = String::new();

    loop {
        let timestamp = chrono::Utc::now();

        // Clear screen for watch-like display
        print!("\x1B[2J\x1B[1;1H");

        println!(
            "Every {}s: {}  {}",
            interval,
            command.join(" "),
            timestamp.format("%H:%M:%S")
        );
        println!();

        // Execute command (stub implementation)
        let current_output = format!(
            "Output from command: {}\nIteration: {}\nTimestamp: {}",
            command.join(" "),
            iteration + 1,
            timestamp
        );

        if differences && !previous_output.is_empty() && previous_output != current_output {
            println!("[Changes detected]");
        }

        println!("{}", current_output);
        previous_output = current_output;

        iteration += 1;
        if iterations > 0 && iteration >= iterations {
            break;
        }

        tokio::time::sleep(Duration::from_secs(interval)).await;
    }

    Ok(())
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct Event {
    timestamp: chrono::DateTime<chrono::Utc>,
    event_type: String,
    severity: String,
    source: String,
    message: String,
    metadata: serde_json::Value,
}

async fn events_command(
    event_type_filter: Option<&str>,
    agent_filter: Option<&str>,
    node_filter: Option<&str>,
    follow: bool,
    limit: usize,
    output_file: Option<&PathBuf>,
    format: OutputFormat,
) -> Result<()> {
    let events = fetch_events(event_type_filter, agent_filter, node_filter, limit).await?;

    // Write to file if specified
    if let Some(path) = output_file {
        let content = serde_json::to_string_pretty(&events)?;
        std::fs::write(path, content)?;
        println!("Events written to: {}", path.display());
        return Ok(());
    }

    // Display events
    display_events(&events, format)?;

    // Follow mode - stream events continuously
    if follow {
        println!("\n[Following events... Press Ctrl+C to stop]");
        loop {
            tokio::time::sleep(Duration::from_secs(2)).await;

            // Fetch new events (stub - would stream from daemon)
            let new_events = fetch_events(event_type_filter, agent_filter, node_filter, 5).await?;

            for event in new_events {
                display_event(&event, format)?;
            }
        }
    }

    Ok(())
}

async fn fetch_events(
    event_type_filter: Option<&str>,
    agent_filter: Option<&str>,
    node_filter: Option<&str>,
    limit: usize,
) -> Result<Vec<Event>> {
    // Stub implementation - would fetch actual events from daemon
    use rand::Rng;
    let mut rng = rand::rng();

    let event_types = [
        "agent.started",
        "agent.stopped",
        "migration.started",
        "migration.completed",
        "health.check",
    ];
    let sources = ["node-001", "node-002", "agent-001", "agent-002"];
    let severities = ["info", "warning", "error"];

    let mut events = Vec::new();

    for i in 0..limit {
        let event_type = event_types[rng.random_range(0..event_types.len())].to_string();
        let source = sources[rng.random_range(0..sources.len())].to_string();
        let severity = severities[rng.random_range(0..severities.len())].to_string();

        // Apply filters
        if let Some(et_filter) = event_type_filter {
            if !event_type.contains(et_filter) {
                continue;
            }
        }

        if let Some(agent_f) = agent_filter {
            if !source.contains(agent_f) {
                continue;
            }
        }

        if let Some(node_f) = node_filter {
            if !source.contains(node_f) {
                continue;
            }
        }

        events.push(Event {
            timestamp: chrono::Utc::now() - chrono::Duration::seconds((limit - i) as i64 * 10),
            event_type,
            severity,
            source,
            message: format!("Event #{} - Sample event message", i + 1),
            metadata: serde_json::json!({"index": i, "random": rng.random::<u32>()}),
        });
    }

    Ok(events)
}

fn display_events(events: &[Event], format: OutputFormat) -> Result<()> {
    match format {
        OutputFormat::Json => {
            println!("{}", serde_json::to_string_pretty(&events)?);
        }
        OutputFormat::Yaml => {
            println!("{}", serde_yaml::to_string(&events)?);
        }
        OutputFormat::Quiet => {
            for event in events {
                println!("{}", event.event_type);
            }
        }
        OutputFormat::Table => {
            let mut table = Table::new();
            table
                .load_preset(UTF8_FULL)
                .set_content_arrangement(ContentArrangement::Dynamic)
                .set_header(vec!["Timestamp", "Type", "Severity", "Source", "Message"]);

            for event in events {
                let severity_cell = match event.severity.as_str() {
                    "error" => Cell::new(&event.severity).fg(Color::Red),
                    "warning" => Cell::new(&event.severity).fg(Color::Yellow),
                    _ => Cell::new(&event.severity).fg(Color::Green),
                };

                table.add_row(vec![
                    Cell::new(event.timestamp.format("%Y-%m-%d %H:%M:%S")),
                    Cell::new(&event.event_type),
                    severity_cell,
                    Cell::new(&event.source),
                    Cell::new(&event.message),
                ]);
            }

            println!("{}", table);
        }
    }

    Ok(())
}

fn display_event(event: &Event, format: OutputFormat) -> Result<()> {
    match format {
        OutputFormat::Json => {
            println!("{}", serde_json::to_string(event)?);
        }
        OutputFormat::Yaml => {
            println!("{}", serde_yaml::to_string(event)?);
        }
        OutputFormat::Quiet => {
            println!("{}", event.event_type);
        }
        OutputFormat::Table => {
            println!(
                "{} [{}] {} - {} - {}",
                event.timestamp.format("%H:%M:%S"),
                event.severity.to_uppercase(),
                event.event_type,
                event.source,
                event.message
            );
        }
    }

    Ok(())
}

async fn dashboard_command(interval: u64, format: OutputFormat) -> Result<()> {
    loop {
        let snapshot = fetch_resource_snapshot().await?;
        let events = fetch_events(None, None, None, 10).await?;

        // Clear screen
        if matches!(format, OutputFormat::Table) {
            print!("\x1B[2J\x1B[1;1H");
        }

        println!("╔══════════════════════════════════════════════════════════════════╗");
        println!(
            "║           MielinOS System Dashboard - {}            ║",
            snapshot.timestamp.format("%H:%M:%S")
        );
        println!("╚══════════════════════════════════════════════════════════════════╝");
        println!();

        // System overview
        println!("┌─ System Overview ───────────────────────────────────────────────┐");
        println!(
            "│ Agents:  {} total, {} active",
            snapshot.system.total_agents, snapshot.system.active_agents
        );
        println!("│ CPU:     {:.1}%", snapshot.system.total_cpu_percent);
        println!(
            "│ Memory:  {:.1} / {:.1} MB ({:.1}%)",
            snapshot.system.total_memory_used_mb,
            snapshot.system.total_memory_mb,
            (snapshot.system.total_memory_used_mb / snapshot.system.total_memory_mb) * 100.0
        );
        println!("└─────────────────────────────────────────────────────────────────┘");
        println!();

        // Top agents
        println!("┌─ Top Agents (by CPU) ───────────────────────────────────────────┐");
        for (i, agent) in snapshot.agents.iter().take(5).enumerate() {
            println!(
                "│ {}. {} - CPU: {:.1}%, Mem: {:.1}MB",
                i + 1,
                agent.name,
                agent.cpu_percent,
                agent.memory_mb
            );
        }
        println!("└─────────────────────────────────────────────────────────────────┘");
        println!();

        // Recent events
        println!("┌─ Recent Events ─────────────────────────────────────────────────┐");
        for event in events.iter().take(5) {
            println!(
                "│ {} [{}] {}",
                event.timestamp.format("%H:%M:%S"),
                event.severity,
                event.message
            );
        }
        println!("└─────────────────────────────────────────────────────────────────┘");

        println!("\nRefreshing in {}s... (Press Ctrl+C to exit)", interval);

        tokio::time::sleep(Duration::from_secs(interval)).await;
    }
}

/// Handle monitor command
pub async fn handle_monitor_command(command: MonitorCommand, format: OutputFormat) -> Result<()> {
    command.execute(format).await
}