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// src/engines/bibtex.rs -- Rustic interface to the bibtex processor.
// Copyright 2017 the Tectonic Project
// Licensed under the MIT License.

use std::ffi::{CStr, CString};

use errors::{ErrorKind, Result};
use io::IoStack;
use status::StatusBackend;
use super::{IoEventBackend, ExecutionState, TectonicBridgeApi};
use super::tex::TexResult;


pub struct BibtexEngine {
}


impl BibtexEngine {
    pub fn new () -> BibtexEngine {
        BibtexEngine {}
    }

    pub fn process (&mut self, io: &mut IoStack,
                    events: &mut IoEventBackend,
                    status: &mut StatusBackend, aux: &str) -> Result<TexResult> {
        let caux = CString::new(aux)?;

        let /*mut*/ state = ExecutionState::new(io, events, status);
        let bridge = TectonicBridgeApi::new(&state);

        unsafe {
            match super::bibtex_simple_main(&bridge, caux.as_ptr()) {
                0 => Ok(TexResult::Spotless),
                1 => Ok(TexResult::Warnings),
                2 => Ok(TexResult::Errors),
                3 => {
                    Err(ErrorKind::Msg("unspecified fatal bibtex error".into()).into())
                },
                99 => {
                    let ptr = super::tt_get_error_message();
                    let msg = CStr::from_ptr(ptr).to_string_lossy().into_owned();
                    Err(ErrorKind::Msg(msg).into())
                },
                x => Err(ErrorKind::Msg(format!("internal error: unexpected 'history' value {}", x)).into())
            }
        }
    }
}