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use super::traits::ParseBytes;
use crate::{impl_name, result::SQLiteResult};
use core::ops::Deref;

/// # Application ID (4)
///
///  The 4-byte big-endian integer at offset 68 is an "Application ID" that can
/// be set by the PRAGMA application_id command in order to identify the
/// database as belonging to or associated with a particular application. The
/// application ID is intended for database files used as an application
/// file-format. The application ID can be used by utilities such as file(1) to
/// determine the specific file type rather than just reporting
/// "SQLite3 Database". A list of assigned application IDs can be seen by
/// consulting the magic.txt file in the SQLite source repository.
#[derive(Debug)]
pub struct ApplicationId(u32);

impl Deref for ApplicationId {
  type Target = u32;

  fn deref(&self) -> &Self::Target {
    &self.0
  }
}
impl_name! {ApplicationId}

impl ParseBytes for ApplicationId {
  const LENGTH_BYTES: usize = 4;
  fn parsing_handler(bytes: &[u8]) -> SQLiteResult<Self> {
    let buf: [u8; Self::LENGTH_BYTES] = bytes.try_into()?;

    let value = u32::from_be_bytes(buf);

    Ok(Self(value))
  }
}