#!/usr/bin/env python3
# Builds the web UI's logo from the masters: artwork/logo.svg (a carved
# Nordic doorway) and artwork/logo-small.svg (the same doorway without its
# carvings, for small sizes). Each master is one evenodd path.
#
#   internal/web/static/assets/logo.svg  the favicon (a copy of the small one)
#   internal/web/static/assets/logo.js   both paths for the web UI, which
#                                        draws them inline (brand.js), so the
#                                        logo appears together with the page
#
# It then runs scripts/banner.py to rebuild the README's banner. Run from
# the repository root after changing a master:
#
#   python3 scripts/logo.py
import json
import os
import shutil
import subprocess
import sys
import xml.etree.ElementTree as ET

MASTERS = {"full": "artwork/logo.svg", "small": "artwork/logo-small.svg"}
OUT = "internal/web/static/assets"
SVG = "{http://www.w3.org/2000/svg}"


def read(path):
    root = ET.parse(path).getroot()
    paths = root.findall(f"{SVG}path")
    if len(paths) != 1:
        sys.exit(f"logo.py: {path} should hold exactly one <path>")
    return root.attrib["viewBox"], paths[0].attrib["d"]


def main():
    found = {name: read(path) for name, path in MASTERS.items()}
    views = {vb for vb, _ in found.values()}
    if len(views) != 1:
        sys.exit("logo.py: the full and small logos must share one viewBox")
    with open(os.path.join(OUT, "logo.js"), "w") as f:
        f.write("// The Housecarl logo, from artwork/logo.svg and artwork/logo-small.svg by\n"
                "// scripts/logo.py; don't edit. brand.js draws it; logo.svg is the small one.\n"
                f"export const viewBox = {json.dumps(views.pop())};\n"
                f"export const full = {json.dumps(found['full'][1])};\n"
                f"export const small = {json.dumps(found['small'][1])};\n")
    shutil.copyfile(MASTERS["small"], os.path.join(OUT, "logo.svg"))
    for name in ("logo.svg", "logo.js"):
        print(f"{OUT}/{name}: {os.path.getsize(os.path.join(OUT, name))} bytes")
    subprocess.run([sys.executable, "scripts/banner.py"], check=True)


if __name__ == "__main__":
    sys.exit(main())