use crate::config::{init_mlf_cache, MlfConfig};
use std::io::Write;

pub fn run_init(skip_prompts: bool) -> Result<(), std::io::Error> {
    let current_dir = std::env::current_dir()?;
    let config_path = current_dir.join("mlf.toml");

    // Check if mlf.toml already exists
    if config_path.exists() {
        eprintln!("mlf.toml already exists in current directory");
        eprintln!("Remove it first if you want to reinitialize");
        return Err(std::io::Error::new(
            std::io::ErrorKind::AlreadyExists,
            "mlf.toml already exists",
        ));
    }

    if !skip_prompts {
        println!("Initialize MLF project in {}?", current_dir.display());
        println!("This will create:");
        println!("  - mlf.toml (project configuration)");
        println!("  - .mlf/ (cache directory for fetched lexicons)");
        println!();
        print!("Continue? (y/n): ");
        std::io::stdout().flush()?;

        let mut input = String::new();
        std::io::stdin().read_line(&mut input)?;

        if input.trim().to_lowercase() != "y" {
            println!("Cancelled");
            return Ok(());
        }
    }

    // Create default mlf.toml
    let config = MlfConfig::default();
    config
        .save(&config_path)
        .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;

    println!("✓ Created mlf.toml");

    // Initialize .mlf directory
    init_mlf_cache(&current_dir)?;
    println!("✓ Initialized .mlf/ directory");

    println!();
    println!("Project initialized successfully!");
    println!();
    println!("Next steps:");
    println!("  1. Create MLF files in ./lexicons/");
    println!("  2. Fetch dependencies: mlf fetch <namespace> --save");
    println!("  3. Check your lexicons: mlf check");
    println!("  4. Generate code: mlf generate");

    Ok(())
}