use miette::{IntoDiagnostic, Result};
use std::env;
use std::fs;
use std::path::Path;

fn main() -> Result<()> {
    let args: Vec<String> = env::args().collect();

    if args.len() != 2 {
        eprintln!("Usage: {} <image-path>", args[0]);
        eprintln!("\nComputes perceptual hash (aHash/average hash) for an image.");
        eprintln!("Outputs 16-character hex string (64-bit hash).");
        std::process::exit(1);
    }

    let image_path = Path::new(&args[1]);

    if !image_path.exists() {
        eprintln!("Error: File not found: {}", image_path.display());
        std::process::exit(1);
    }

    // Read image bytes
    let image_bytes = fs::read(image_path).into_diagnostic()?;

    // Compute phash
    let phash = skywatch_phash_rs::processor::phash::compute_phash(&image_bytes)?;

    // Output just the hash
    println!("{}", phash);

    Ok(())
}