use anyhow::{Result, bail};
use clap::Parser;
use std::path::PathBuf;

#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
pub struct Args {
    /// Path to the input JSON configuration file.
    #[arg(short, long)]
    pub input: PathBuf,

    /// Path to the output directory for downloaded rule files.
    #[arg(short, long)]
    pub output: PathBuf,

    /// Number of concurrent download operations.
    #[arg(long, default_value_t = 10)]
    pub concurrency: usize,

    /// The new domain to use for rewriting rule URLs.
    #[arg(long)]
    pub domain: Option<String>,

    /// The path on the domain for the rewritten rule URLs.
    #[arg(long, name = "rule-path")]
    pub rule_path: Option<String>,
}

impl Args {
    /// Validates that domain and rule_path are either both present or both absent.
    pub fn validate_domain_and_rule_path(&self) -> Result<()> {
        if self.domain.is_some() != self.rule_path.is_some() {
            bail!("--domain and --rule-path must be used together.");
        }
        Ok(())
    }
}