use std::path::Path;
use std::{env, path::PathBuf};

use tokio::fs;

use crate::error::AppResult;
use crate::tasks::all_tasks;

const DEFAULT_CONFIG_DIR: &str = "/etc";

lazy_static::lazy_static! {
    pub static ref CFG_PATH: PathBuf = env::var("TRM_CFG_PATH").map(PathBuf::from).unwrap_or_else(|_| PathBuf::from(DEFAULT_CONFIG_DIR).join("tourmaline"));
    pub static ref SCRIPT_PATH: PathBuf = CFG_PATH.join("scripts");
}

pub async fn generate_script_files<P: AsRef<Path>>(output: P) -> AppResult<()> {
    let output = output.as_ref();

    let tasks = all_tasks();

    for (name, up_script, down_script) in tasks {
        let script_dir = output.join(&name);

        if !script_dir.exists() {
            fs::create_dir_all(&script_dir).await?;
        }

        fs::write(
            output.join(up_script),
            format!(
                r#"
# Applies all system changes of `{name}`
def main [cfg] {{
    echo "Executing up task `{name}` with config" $cfg
}}
        "#
            )
            .trim(),
        )
        .await?;

        fs::write(
            output.join(down_script),
            format!(
                r#"
# Reverts all system changes of `{name}`
def main [cfg] {{
    echo "Executing up task `{name}` with config" $cfg
}}
        "#
            )
            .trim(),
        )
        .await?;
    }

    Ok(())
}