use std::{
    fs, io,
    path::{Path, PathBuf},
};

use serde::{Deserialize, Serialize};

use super::SharryFile;

#[derive(Debug, Clone, Hash, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct FileChecked {
    pub(super) path: PathBuf,
    pub(super) size: u64,
}

impl FileChecked {
    pub fn new(value: impl AsRef<Path>) -> io::Result<Self> {
        let meta = fs::metadata(&value)?;
        if meta.is_file() {
            Ok(Self {
                path: fs::canonicalize(&value)?,
                size: meta.len(),
            })
        } else {
            Err(io::Error::new(
                io::ErrorKind::InvalidInput,
                "Not a regular file",
            ))
        }
    }
}

impl<'t> SharryFile<'t> for FileChecked {
    /// get a reference to the file's name
    ///
    /// Uses `SharryFile::extract_file_name`, which may **panic**!
    fn get_name(&'t self) -> &'t str {
        <Self as SharryFile>::extract_file_name(&self.path)
    }

    fn get_size(&self) -> u64 {
        self.size
    }
}