#!/usr/bin/env python3
"""Generate runtime asset names and helpcode schemes from assets.json."""
import argparse
import json
from pathlib import Path
from product import CONTRACT

lines = ['// Generated by contracts/assets/generate.py; edit assets.json instead.',
         '#pragma once', '#include <array>', '#include <string_view>',
         'namespace metasequoia::assets {',
         f'inline constexpr int contract_version = {CONTRACT["contract_version"]};']
for entry in CONTRACT['assets']:
    lines.append(f'inline constexpr char {entry["id"]}[] = {json.dumps(entry["path"])};')
helpcodes = [entry for entry in CONTRACT['assets'] if 'schema' in entry]
lines += ['struct Helpcode { std::string_view schema; const char *path; };',
          f'inline constexpr std::array<Helpcode, {len(helpcodes)}> helpcodes = {{{{']
lines += [f'    {{{json.dumps(entry["schema"])}, {entry["id"]}}},' for entry in helpcodes]
lines += ['}};', '} // namespace metasequoia::assets', '']
expected = '\n'.join(lines)
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--check', action='store_true')
args = parser.parse_args()
target = Path(__file__).with_name('assets.h')
if args.check:
    if not target.exists() or target.read_text() != expected:
        raise SystemExit('Assets header is stale; run contracts/assets/generate.py')
else:
    target.write_text(expected)