matrixcode-core 0.4.13

use anyhow::Result;
use async_trait::async_trait;
use serde_json::{Value, json};
use std::time::Duration;

use super::{Tool, ToolDefinition};
use crate::approval::RiskLevel;

/// Monitor tool for watching processes and file changes
pub struct MonitorTool;

#[async_trait]
impl Tool for MonitorTool {
    fn definition(&self) -> ToolDefinition {
        ToolDefinition {
            name: "monitor".to_string(),
            description: "监控外部进程或等待状态变化。用于：(1) 等待构建/测试完成；(2) 监视文件变化；(3) 监控后台服务；(4) 跟踪进程状态。当监控条件满足或超时到期时返回。".to_string(),
            parameters: json!({
                "type": "object",
                "properties": {
                    "mode": {
                        "type": "string",
                        "enum": ["process", "file", "port", "timer"],
                        "description": "监控模式：'process' 监视进程，'file' 监视文件变化，'port' 等待端口可用，'timer' 简单计时"
                    },
                    "target": {
                        "type": "string",
                        "description": "监控目标：'process' 用 PID 或进程名，'file' 用文件路径，'port' 用端口号"
                    },
                    "timeout": {
                        "type": "integer",
                        "default": 30000,
                        "description": "超时时间（毫秒，默认 30 秒）"
                    },
                    "condition": {
                        "type": "string",
                        "enum": ["exit", "running", "exists", "changed", "available"],
                        "default": "available",
                        "description": "等待条件：'exit' 等进程结束，'running' 等进程启动，'exists' 等文件存在，'changed' 等文件修改，'available' 等端口可用"
                    }
                },
                "required": ["mode"]
            }),
        }
    }

    fn risk_level(&self) -> RiskLevel {
        RiskLevel::Safe // Read-only monitoring
    }

    async fn execute(&self, params: Value) -> Result<String> {
        let mode = params["mode"]
            .as_str()
            .ok_or_else(|| anyhow::anyhow!("missing 'mode'"))?;
        let target = params["target"].as_str().map(|s| s.to_string());
        let timeout_ms = params["timeout"].as_u64().unwrap_or(30000);
        let condition = params["condition"].as_str().unwrap_or("available");

        let mode = mode.to_string();
        let condition = condition.to_string();

        // Use spawn_blocking for synchronous monitoring operations
        tokio::task::spawn_blocking(move || {
            let timeout = Duration::from_millis(timeout_ms);
            let start = std::time::Instant::now();

            match mode.as_str() {
                "process" => monitor_process(target.as_deref(), &condition, timeout, start),
                "file" => monitor_file(target.as_deref(), &condition, timeout, start),
                "port" => monitor_port(target.as_deref(), timeout, start),
                "timer" => monitor_timer(timeout_ms, start),
                _ => Ok(format!("Unknown monitor mode: {}", mode)),
            }
        })
        .await?
    }
}

/// Monitor a process
fn monitor_process(
    target: Option<&str>,
    condition: &str,
    timeout: Duration,
    start: std::time::Instant,
) -> Result<String> {
    let target_str =
        target.ok_or_else(|| anyhow::anyhow!("missing 'target' for process monitoring"))?;

    // Parse target as PID or process name
    let pid: Option<u32> = target_str.parse().ok();

    match condition {
        "exit" => {
            // Wait for process to exit
            loop {
                if start.elapsed() > timeout {
                    return Ok(format!(
                        "Timeout: Process {} still running after {:.1}s",
                        target_str,
                        timeout.as_secs_f64()
                    ));
                }

                // Check if process is still running
                let running = if let Some(pid) = pid {
                    is_process_running_by_pid(pid)
                } else {
                    is_process_running_by_name(target_str)
                };

                if !running {
                    return Ok(format!("Process {} has exited", target_str));
                }

                std::thread::sleep(Duration::from_millis(500));
            }
        }
        "running" => {
            // Wait for process to start
            loop {
                if start.elapsed() > timeout {
                    return Ok(format!(
                        "Timeout: Process {} not found after {:.1}s",
                        target_str,
                        timeout.as_secs_f64()
                    ));
                }

                let running = if let Some(pid) = pid {
                    is_process_running_by_pid(pid)
                } else {
                    is_process_running_by_name(target_str)
                };

                if running {
                    return Ok(format!("Process {} is now running", target_str));
                }

                std::thread::sleep(Duration::from_millis(500));
            }
        }
        _ => Ok(format!("Unknown process condition: {}", condition)),
    }
}

/// Monitor a file
fn monitor_file(
    target: Option<&str>,
    condition: &str,
    timeout: Duration,
    start: std::time::Instant,
) -> Result<String> {
    let target_str =
        target.ok_or_else(|| anyhow::anyhow!("missing 'target' for file monitoring"))?;
    let path = std::path::Path::new(target_str);

    let initial_mtime = path.metadata().and_then(|m| m.modified()).ok();

    match condition {
        "exists" => loop {
            if start.elapsed() > timeout {
                return Ok(format!(
                    "Timeout: File {} does not exist after {:.1}s",
                    target_str,
                    timeout.as_secs_f64()
                ));
            }

            if path.exists() {
                return Ok(format!("File {} now exists", target_str));
            }

            std::thread::sleep(Duration::from_millis(500));
        },
        "changed" => loop {
            if start.elapsed() > timeout {
                return Ok(format!(
                    "Timeout: File {} not changed after {:.1}s",
                    target_str,
                    timeout.as_secs_f64()
                ));
            }

            let current_mtime = path.metadata().and_then(|m| m.modified()).ok();

            if let (Some(initial), Some(current)) = (initial_mtime, current_mtime)
                && current > initial
            {
                return Ok(format!("File {} has been modified", target_str));
            }

            std::thread::sleep(Duration::from_millis(500));
        },
        _ => Ok(format!("Unknown file condition: {}", condition)),
    }
}

/// Monitor a port
fn monitor_port(
    target: Option<&str>,
    timeout: Duration,
    start: std::time::Instant,
) -> Result<String> {
    let target_str =
        target.ok_or_else(|| anyhow::anyhow!("missing 'target' for port monitoring"))?;
    let port: u16 = target_str
        .parse()
        .map_err(|_| anyhow::anyhow!("invalid port number: {}", target_str))?;

    loop {
        if start.elapsed() > timeout {
            return Ok(format!(
                "Timeout: Port {} not available after {:.1}s",
                port,
                timeout.as_secs_f64()
            ));
        }

        // Try to connect to port
        let addr = format!("127.0.0.1:{}", port);
        if std::net::TcpStream::connect(&addr).is_ok() {
            return Ok(format!("Port {} is now available", port));
        }

        std::thread::sleep(Duration::from_millis(500));
    }
}

/// Simple timer countdown
fn monitor_timer(timeout_ms: u64, start: std::time::Instant) -> Result<String> {
    let duration = Duration::from_millis(timeout_ms);
    loop {
        let elapsed = start.elapsed();
        if elapsed >= duration {
            return Ok(format!(
                "Timer completed after {:.1}s",
                duration.as_secs_f64()
            ));
        }

        std::thread::sleep(Duration::from_millis(100));
    }
}

/// Check if process is running by PID
fn is_process_running_by_pid(pid: u32) -> bool {
    #[cfg(unix)]
    {
        use std::process::Command;
        Command::new("ps")
            .arg("-p")
            .arg(pid.to_string())
            .output()
            .map(|o| o.status.success())
            .unwrap_or(false)
    }

    #[cfg(windows)]
    {
        use std::process::Command;
        let pid_str = pid.to_string();
        let pid_bytes = pid_str.as_bytes();
        Command::new("tasklist")
            .arg("/FI")
            .arg(format!("PID eq {}", pid))
            .output()
            .map(|o| {
                o.stdout.windows(4).any(|w| {
                    // Look for PID in output
                    w.windows(pid_bytes.len()).any(|w2| w2 == pid_bytes)
                })
            })
            .unwrap_or(false)
    }
}

/// Check if process is running by name
fn is_process_running_by_name(name: &str) -> bool {
    #[cfg(unix)]
    {
        use std::process::Command;
        Command::new("pgrep")
            .arg("-x")
            .arg(name)
            .output()
            .map(|o| !o.stdout.is_empty())
            .unwrap_or(false)
    }

    #[cfg(windows)]
    {
        use std::process::Command;
        Command::new("tasklist")
            .arg("/FI")
            .arg(format!("IMAGENAME eq {}", name))
            .output()
            .map(|o| o.stdout.windows(name.len()).any(|w| w == name.as_bytes()))
            .unwrap_or(false)
    }
}