#!/usr/bin/env python3
import argparse
import pathlib
import os
import subprocess


CWD = pathlib.Path(os.getcwd())
BASE_DIR = pathlib.Path(os.path.dirname(os.path.abspath(__file__)))
TEMPLATE_FILE = BASE_DIR / 'main.tex'
OUTPUT_FILE = CWD / 'output.pdf'
CONTEXT_FILE = CWD / 'context.yaml'
BUILD_PASSES = 2


def build(input_file: pathlib.Path):
    build_args = ['pandoc', str(input_file)]

    if CONTEXT_FILE.exists():
        build_args.append(str(CONTEXT_FILE))

    build_args.extend([
        '--template',
        str(TEMPLATE_FILE),
        '-o',
        str(OUTPUT_FILE)
    ])
    return subprocess.run(build_args, cwd=str(BASE_DIR), check=True)


def parse_args(args=None):
    parser = argparse.ArgumentParser()
    parser.add_argument("-v", "--verbose", help="Set verbosity level (repeat argument)", action="count", default=0)
    parser.add_argument("input", help="Input File", action='store', type=pathlib.Path,)
    parser.add_help = True
    return parser.parse_args(args=args)


if __name__ == '__main__':
    args = parse_args()
    input_file = args.input.resolve()
    if not input_file.is_file():
        raise ValueError("Failed to find {}".format(input_file))
    for i in range(2):
        print("Building pass {}.".format(i + 1))
        build(input_file)