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//! Table header definition.

use bytesutil::{ReadBytes, WriteBytes};
use crate::core::header::Struct;
use crate::table::error::Error;

/// Size in bytes of a table header structure.
pub const SIZE_HEADER_STRUCTURE: usize = 8;

/// Table header structure.
pub struct Header {
    /// The address of this table name in the string section.
    pub name: u32,

    /// The number of columns in this table section.
    pub columns: u16
}

impl Struct<SIZE_HEADER_STRUCTURE> for Header {
    type Output = Header;
    type Error = Error;

    fn new() -> Self {
        Header {
            name: 0,
            columns: 0
        }
    }

    fn error_buffer_size() -> Option<Self::Error> {
        Some(Error::Eos)
    }

    fn from_bytes(buffer: [u8; SIZE_HEADER_STRUCTURE]) -> Result<Self::Output, Self::Error> {
        let name = u32::read_bytes_le(&buffer[0..4]);
        let columns = u16::read_bytes_le(&buffer[4..6]);
        Ok(Header { name, columns })
    }

    fn to_bytes(&self) -> [u8; SIZE_HEADER_STRUCTURE] {
        let mut buffer = [0; SIZE_HEADER_STRUCTURE];
        self.name.write_bytes_le(&mut buffer[0..4]);
        self.columns.write_bytes_le(&mut buffer[4..6]);
        buffer
    }
}
