//! Report the defect map a raw file carries, if it carries one.
//!
//! ```text
//! cargo run -p dr-decode --example defects -- IMG_6320.dng photo.cr2
//! ```
//!
//! Exists because whether this is worth building a correction stage for is a
//! question about *your files*, not about the specification: DNGs written by
//! cameras that map their own sensors carry `OpcodeList1`, conversions from a
//! proprietary raw usually do not, and no CR2 or scanner TIFF ever does.
//! Rather than guess, point this at the library and see.

fn main() {
    let files: Vec<String> = std::env::args().skip(1).collect();
    if files.is_empty() {
        eprintln!("usage: defects <raw file>...");
        std::process::exit(2);
    }

    for path in &files {
        let bytes = match std::fs::read(path) {
            Ok(b) => b,
            Err(e) => {
                println!("{path}: unreadable — {e}");
                continue;
            }
        };

        let found = dr_decode::defects(&bytes);
        if found.is_empty() {
            println!("{path}: no defect map");
            continue;
        }

        println!(
            "{path}: {} bad pixel(s), {} bad line(s)",
            found.pixels.len(),
            found.lines.len()
        );
        // A handful, so the output stays readable on a sensor reporting
        // hundreds — the count above is the number that matters.
        for p in found.pixels.iter().take(8) {
            println!("    pixel at {},{}", p.x, p.y);
        }
        for l in found.lines.iter().take(8) {
            match l {
                dr_decode::BadLine::Column(x) => println!("    dead column {x}"),
                dr_decode::BadLine::Row(y) => println!("    dead row {y}"),
            }
        }
    }
}