#!/usr/bin/env python3

import os
import re
import subprocess
import sys

from gds_to_lef_gds_mag import _magic_tcl_header, run_magic


def convert_to_svg(input_gds, input_techfile):
    input_gds = os.path.abspath(input_gds)
    input_techfile = os.path.abspath(input_techfile)

    destdir, gdsfile = os.path.split(input_gds)

    basename, ext = os.path.splitext(gdsfile)

    output_svg = os.path.join(destdir, "{}.svg".format(basename))
    assert not os.path.exists(output_svg), output_svg + " already exists!?"

    tcl_path = os.path.join(destdir, "{}.gds2svg.tcl".format(basename))
    with open(tcl_path, 'w') as ofile:
        _magic_tcl_header(ofile, input_gds)

        ofile.write("load " + basename + "\n")
        ofile.write("box 0 0 0 0\n")
        ofile.write("select top cell\n")
        ofile.write("expand\n")
        ofile.write("view\n")
        ofile.write("select clear\n")
        ofile.write("box position -1000 -1000\n")
        ofile.write("plot svg " + basename + ".tmp.svg\n")
        ofile.write("quit -noprompt\n")

    output = run_magic(destdir, tcl_path, input_techfile, " XR")
    tmp_svg = os.path.join(destdir, "{}.tmp.svg".format(basename))
    assert os.path.exists(tmp_svg), tmp_svg + " doesn't exist!?"
    os.unlink(tcl_path)

    # Remove the background
    with open(tmp_svg) as f:
        data = f.read()
    data = re.sub('<rect[^>]* style="[^"]*fill-opacity:1;[^"]*"/>', '', data)
    with open(tmp_svg, 'w') as f:
        f.write(data)

    # Crop the image using inkscape
    subprocess.call(["inkscape", "--verb=FitCanvasToDrawing", "--verb=FileSave", "--verb=FileClose", "--verb=FileQuit", tmp_svg])

    # Move into the correct location
    os.rename(tmp_svg, output_svg)
    print("Created", output_svg)


convert_to_svg(*sys.argv[1:])