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//! Sigma byte stream writer
use super::constant_store::ConstantStore;
use sigma_ser::vlq_encode::WriteSigmaVlqExt;
use std::io::Write;

/// Implementation for SigmaByteWrite
pub struct SigmaByteWriter<'a, W> {
    inner: &'a mut W,
    constant_store: Option<&'a mut ConstantStore>,
}

impl<'a, W: Write> SigmaByteWriter<'a, W> {
    /// Make a new writer with underlying Write and optional constant store
    pub fn new(
        w: &'a mut W,
        constant_store: Option<&'a mut ConstantStore>,
    ) -> SigmaByteWriter<'a, W> {
        SigmaByteWriter {
            inner: w,
            constant_store,
        }
    }
}

/// Sigma byte writer trait with a store for constant segregation
pub trait SigmaByteWrite: WriteSigmaVlqExt {
    /// Constant store (if any) attached to the writer to collect segregated constants
    fn constant_store(&mut self) -> Option<&mut ConstantStore>;
}

impl<'a, W: Write> Write for SigmaByteWriter<'a, W> {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        self.inner.write(buf)
    }

    fn flush(&mut self) -> std::io::Result<()> {
        self.inner.flush()
    }
}

impl<'a, W: Write> SigmaByteWrite for SigmaByteWriter<'a, W> {
    fn constant_store(&mut self) -> Option<&mut ConstantStore> {
        match self.constant_store.as_mut() {
            Some(store) => Some(store),
            None => None,
        }
    }
}