//! `warpgate warmup` — pre-cache a remote directory to local SSD.

use std::process::Command;

use anyhow::{Context, Result};

use crate::config::Config;
use crate::rclone::config as rclone_config;

pub fn run(config: &Config, path: &str, newer_than: Option<&str>) -> Result<()> {
    let remote_src = format!("nas:{}/{}", config.connection.remote_path, path);
    let local_dest = std::env::temp_dir().join("warpgate-warmup");

    println!("Warming up: {}", remote_src);

    // Create temp destination for downloaded files
    std::fs::create_dir_all(&local_dest)
        .context("Failed to create temp directory for warmup")?;

    let mut cmd = Command::new("rclone");
    cmd.arg("copy")
        .arg("--config")
        .arg(rclone_config::RCLONE_CONF_PATH)
        .arg(&remote_src)
        .arg(&local_dest)
        .arg("--no-traverse")
        .arg("--progress");

    if let Some(age) = newer_than {
        cmd.arg("--max-age").arg(age);
    }

    println!("Downloading from remote NAS...");
    let status = cmd.status().context("Failed to run rclone copy")?;

    // Clean up temp directory
    let _ = std::fs::remove_dir_all(&local_dest);

    if status.success() {
        println!("Warmup complete.");
        Ok(())
    } else {
        anyhow::bail!("rclone copy exited with status {}", status);
    }
}