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use crate::{owned::SPACE, tree::Mode};
use bstr::{BString, ByteSlice};
use quick_error::quick_error;
use std::io;

quick_error! {
    /// The Error used in [`Tree::write_to()`].
    #[derive(Debug)]
    #[allow(missing_docs)]
    pub enum Error {
        NewlineInFilename(name: BString) {
            display("Newlines are invalid in file paths: {:?}", name)
        }
    }
}

impl From<Error> for io::Error {
    fn from(err: Error) -> Self {
        io::Error::new(io::ErrorKind::Other, err)
    }
}

/// A mutable Tree, containing other trees, blobs or commits.
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone)]
#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
pub struct Tree {
    /// The directories and files contained in this tree.
    pub entries: Vec<Entry>,
}

/// An entry in a [`Tree`], similar to an entry in a directory.
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone)]
#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
pub struct Entry {
    /// The kind of object to which `oid` is pointing to.
    pub mode: Mode,
    /// The name of the file in the parent tree.
    pub filename: BString,
    /// The id of the object representing the entry.
    pub oid: git_hash::ObjectId,
}

/// Serialization
impl Mode {
    /// Return the representation as used in the git internal format.
    pub fn as_bytes(&self) -> &'static [u8] {
        use Mode::*;
        match self {
            Tree => b"40000",
            Blob => b"100644",
            BlobExecutable => b"100755",
            Link => b"120000",
            Commit => b"160000",
        }
    }
}

/// Serialization
impl Tree {
    /// Serialize this tree to `out` in the git internal format.
    pub fn write_to(&self, mut out: impl io::Write) -> io::Result<()> {
        for Entry { mode, filename, oid } in &self.entries {
            out.write_all(mode.as_bytes())?;
            out.write_all(SPACE)?;

            if filename.find_byte(b'\n').is_some() {
                return Err(Error::NewlineInFilename(filename.to_owned()).into());
            }
            out.write_all(&filename)?;
            out.write_all(&[b'\0'])?;

            out.write_all(oid.as_bytes())?;
        }
        Ok(())
    }
}