#!/usr/bin/env python3
import argparse
import os
import sys

BASE_PATH = os.path.dirname(os.path.abspath(__file__))
HTML_TEMPLATE_NAME = "d3-graphviz-template.html"
HTML_TEMPLATE_PATH = os.path.join(BASE_PATH, HTML_TEMPLATE_NAME)


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "dotfile",
        nargs="?",
        type=argparse.FileType("r"),
        default=sys.stdin,
        help="Input .dot file, reads from stdin if not set",
    )
    parser.add_argument(
        "htmlfile",
        nargs="?",
        type=argparse.FileType("w"),
        default=sys.stdout,
        help="Output .html file, writes to stdout if not set",
    )
    args = parser.parse_args()

    template = open(HTML_TEMPLATE_PATH, "r")

    for line in template:
        if "<INSERT_DOT>" in line:
            print(args.dotfile.read(), file=args.htmlfile, end="")
        else:
            print(line, file=args.htmlfile, end="")


if __name__ == "__main__":
    main()