darpan 0.2.4

use crate::config::{ProjectConfig, UserConfig};
use anyhow::{Context, Result};
use std::fs;
use std::path::{Path, PathBuf};

pub struct ConfigLoader;

impl ConfigLoader {
    pub fn load_user_config() -> Result<UserConfig> {
        let config_path = Self::user_config_path()?;
        
        if !config_path.exists() {
            return Ok(UserConfig::default());
        }
        
        let content = fs::read_to_string(&config_path)
            .with_context(|| format!("Failed to read user config from {:?}", config_path))?;
        
        let config: UserConfig = serde_yaml::from_str(&content)
            .with_context(|| "Failed to parse user config")?;
        
        Ok(config)
    }

    pub fn load_project_config(project_path: &Path) -> Result<Option<ProjectConfig>> {
        let config_path = project_path.join(".darpan.yml");
        
        if !config_path.exists() {
            return Ok(None);
        }
        
        let content = fs::read_to_string(&config_path)
            .with_context(|| format!("Failed to read project config from {:?}", config_path))?;
        
        let config: ProjectConfig = serde_yaml::from_str(&content)
            .with_context(|| "Failed to parse project config")?;
        
        Ok(Some(config))
    }

    pub fn save_project_config(project_path: &Path, config: &ProjectConfig) -> Result<()> {
        let config_path = project_path.join(".darpan.yml");
        let yaml = serde_yaml::to_string(config)?;
        fs::write(&config_path, yaml)?;
        Ok(())
    }

    pub fn user_config_path() -> Result<PathBuf> {
        let config_dir = dirs::config_dir()
            .context("Could not determine config directory")?
            .join("darpan");
        
        fs::create_dir_all(&config_dir)?;
        Ok(config_dir.join("config.yml"))
    }

    pub fn create_default_project_config(project_path: &Path) -> Result<()> {
        let config_path = project_path.join(".darpan.yml");
        
        if config_path.exists() {
            anyhow::bail!(".darpan.yml already exists");
        }
        
        let template = ProjectConfig::default_template();
        fs::write(&config_path, template)?;
        
        Ok(())
    }
}