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use std::io;

use bstr::ByteSlice;

use crate::{encode, encode::NL, Commit, CommitRef, Kind};

impl crate::WriteTo for Commit {
    /// Serializes this instance to `out` in the git serialization format.
    fn write_to(&self, mut out: impl io::Write) -> io::Result<()> {
        encode::trusted_header_id(b"tree", &self.tree, &mut out)?;
        for parent in &self.parents {
            encode::trusted_header_id(b"parent", parent, &mut out)?;
        }
        encode::trusted_header_signature(b"author", &self.author.to_ref(), &mut out)?;
        encode::trusted_header_signature(b"committer", &self.committer.to_ref(), &mut out)?;
        if let Some(encoding) = self.encoding.as_ref() {
            encode::header_field(b"encoding", encoding, &mut out)?;
        }
        for (name, value) in &self.extra_headers {
            let has_newline = value.find_byte(b'\n').is_some();
            if has_newline {
                encode::header_field_multi_line(name, value, &mut out)?;
            } else {
                encode::trusted_header_field(name, value, &mut out)?;
            }
        }
        out.write_all(NL)?;
        out.write_all(&self.message)
    }

    fn kind(&self) -> Kind {
        Kind::Commit
    }
}

impl<'a> crate::WriteTo for CommitRef<'a> {
    /// Serializes this instance to `out` in the git serialization format.
    fn write_to(&self, mut out: impl io::Write) -> io::Result<()> {
        encode::trusted_header_id(b"tree", &self.tree(), &mut out)?;
        for parent in self.parents() {
            encode::trusted_header_id(b"parent", &parent, &mut out)?;
        }
        encode::trusted_header_signature(b"author", &self.author, &mut out)?;
        encode::trusted_header_signature(b"committer", &self.committer, &mut out)?;
        if let Some(encoding) = self.encoding.as_ref() {
            encode::header_field(b"encoding", encoding, &mut out)?;
        }
        for (name, value) in &self.extra_headers {
            let has_newline = value.find_byte(b'\n').is_some();
            if has_newline {
                encode::header_field_multi_line(name, value, &mut out)?;
            } else {
                encode::trusted_header_field(name, value, &mut out)?;
            }
        }
        out.write_all(NL)?;
        out.write_all(self.message)
    }

    fn kind(&self) -> Kind {
        Kind::Commit
    }
}