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use crate::{ByteOrder, Result, Table};
use std::ops::{Index, IndexMut};

/// The table array to be written.
#[derive(Debug)]
pub struct TableArray {
    /// A flag indicating if the table had attached metadata,
    /// and the table structure itself.
    tables: Vec<(bool, Table)>,
}

impl TableArray {
    /// Create a new empty table array.
    pub fn new() -> Self {
        Self { tables: vec![] }
    }

    /// Get the number of tables in the array.
    pub fn len(&self) -> usize {
        self.tables.len()
    }

    /// Push a new table into the array.
    pub fn push(&mut self, has_metadata: bool, table: Table) {
        self.tables.push((has_metadata, table));
    }

    /// Get the last table in the vector mutably.
    pub fn last_mut(&mut self) -> Option<&mut (bool, Table)> {
        self.tables.last_mut()
    }

    /// Convert the table array to a byte vector for
    /// writing.
    pub fn to_bytes<E: ByteOrder>(self) -> Result<Vec<u8>> {
        let mut buffer = vec![];
        for table in self.tables {
            table.1.write::<E>(&mut buffer)?;
        }
        Ok(buffer)
    }
}

impl Index<usize> for TableArray {
    type Output = (bool, Table);

    fn index(&self, index: usize) -> &Self::Output {
        &self.tables[index]
    }
}

impl IndexMut<usize> for TableArray {
    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
        &mut self.tables[index]
    }
}