#!/usr/bin/env python3
# vim: set ft=python ts=4 sw=4 et encoding=utf-8 :
# SPDX-FileCopyrightText: 2025-present RenatoXSR <renatoxsr@gmail.com>
# SPDX-License-Identifier: BSD-3-Clause-Clear
import errno, os, shutil, subprocess, sys
from pathlib import Path

from renatoxsr.logger import set_logger
logger = set_logger(__name__)
if "--debug" in sys.argv:
    logger.setLevel("DEBUG")

def pandoc(
        input_file: str | Path, 
        bin: str | Path = "pandoc",
        output: str | Path = "-",
        overwrite = False,
        to="markdown",
    ) -> str:
    logger.info("%s: from '%s' to '%s'", bin, input_file, output)
    if not Path(bin).is_file():
        which_bin = shutil.which(bin)
        if not Path(which_bin).is_file():
            raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), bin)
    
    fpath = Path(input_file)
    if not fpath.is_file():
        raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), input_file)
    
    outf = Path(output)
    if output != "-" and outf.is_file() and not overwrite:
        raise FileExistsError(errno.EEXIST, os.strerror(errno.EEXIST), outf)
    cmd = [bin, 
           "--output", "-" if output=="-" else outf.resolve(), 
           "--write", to, fpath]
    logger.debug("CMD %s", str(cmd))
    proc = subprocess.run(cmd, text=True)
    
    if proc.stderr:
        logger.error(proc.stderr)
        
    if proc.stdout and output != "-":
        logger.info(proc.stdout)
    else:
        return(proc.stdout)