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use eyre::{Context, Result};
use std::env::current_dir;
use std::path::PathBuf;

#[derive(Debug, Default, Clone)]
pub struct Env {
    root_dir: PathBuf,
    task_dir: PathBuf,
    output_dir: PathBuf,
    resource_dir: PathBuf,
}

impl Env {
    pub fn new(task_dir: PathBuf) -> Result<Self> {
        let root_dir = current_dir().wrap_err("Unable to get current directory.")?;
        let task_name = task_dir.file_name().unwrap().to_str().unwrap().to_owned();

        let output_dir = root_dir.join("output").join(&task_name);
        if !output_dir.is_dir() {
            std::fs::create_dir_all(&output_dir)
                .wrap_err_with(|| format!("Unable to create output directory: {output_dir:?}"))?;
        }

        let resource_dir = if task_dir.join("data").exists() {
            task_dir.join("data")
        } else {
            task_dir.clone()
        };

        Ok(Self {
            root_dir,
            task_dir,
            output_dir,
            resource_dir,
        })
    }

    #[inline(always)]
    pub fn root(&self) -> &PathBuf {
        &self.root_dir
    }

    #[inline(always)]
    pub fn task(&self) -> &PathBuf {
        &self.task_dir
    }

    #[inline(always)]
    pub fn output(&self) -> &PathBuf {
        &self.output_dir
    }

    #[inline(always)]
    pub fn resource(&self) -> &PathBuf {
        &self.resource_dir
    }
}