#!/usr/bin/env python3
# -*- coding: utf8 -*-
# SPDX-License-Identifier: Apache-2.0
# Copyright ©2020-2022, The American University in Cairo

import os
import re
import sys
import traceback

try:
    import click
    import yaml
except ImportError:
    print("You need to install click and pyyaml: python3 -m pip install click pyyaml")
    exit(os.EX_CONFIG)


@click.command()
@click.option(
    "-p",
    "--platform",
    required=True,
    help="Platform (PDK) to use",
)
@click.option(
    "-s",
    "--scl",
    required=True,
    help="SCL to use in the format",
)
@click.option(
    "-o",
    "--output",
    "output_file",
    type=click.Path(file_okay=True, dir_okay=False),
    default="/dev/stdout",
    help="Output file",
    show_default=True,
)
@click.argument(
    "input_file",
    type=click.Path(file_okay=True, dir_okay=False, exists=True),
    required=True,
)
def unplace(platform: str, scl: str, output_file: str, input_file: str):
    dn = os.path.dirname
    dffram_path = dn(dn(dn(os.path.abspath(__file__))))
    tech_path = os.path.join(dffram_path, "platforms", platform, scl, "tech.yml")
    try:
        tech_str = open(tech_path).read()
    except FileNotFoundError:
        print(f"{tech_path} not found.", file=sys.stderr)
        exit(os.EX_NOINPUT)

    data: dict = yaml.load(tech_str, Loader=yaml.SafeLoader)
    rx_list = list(data["fills"].values())

    try:
        input_str = open(input_file).read()
    except FileNotFoundError:
        print(f"{input_file} not found.", file=sys.stderr)
        exit(os.EX_NOINPUT)

    output_str = input_str

    replaced = 0
    for rx in rx_list:
        frx = rf"({rx})\s*\+\s*PLACED\s*\(\s*\d+\s*\d+\s*\)\s*\w+"
        output_str, replacements = re.subn(frx, r"\1", output_str)
        replaced += replacements

    with open(output_file, "w") as f:
        f.write(output_str)

    print(f"Done. Unplaced {replaced} instances.", file=sys.stderr)


def main():
    try:
        unplace()
    except Exception:
        print(
            "An unhandled exception has occurred.",
            traceback.format_exc(),
            file=sys.stderr,
        )
        exit(os.EX_UNAVAILABLE)


if __name__ == "__main__":
    main()