use std::fs::File;
use std::io::{self, Read};
use std::path::Path;

/// Validates a WAD file to make sure that it is a legitimate file
///
/// Parameters:
/// - path: &str - Path to the WAD to validate
pub fn validate_wad(path: &str) -> io::Result<bool> {
    let wad_file = Path::new(path);

    // Check to see if the WAD exists
    if !(wad_file.exists()) {
        // Return back false because we didn't pass a valid file
        return Ok(false);
    }

    // If the file exists open it and read the first 4 bytes
    // of the file and see if we get "IWAD" or "PWAD"
    let mut file = File::open(wad_file)?;
    let mut magic = [0u8; 4];
    file.read_exact(&mut magic)?;

    // Now we return based on what we found
    Ok(magic == *b"IWAD" || magic == *b"PWAD")
}