import json
from pathlib import Path
from spp import get_spp, TargetType

spp = get_spp()

def _should_generate() -> bool:
    # check if any program or library target has been built
    for target in spp.targets:
        if target.target_type in (TargetType.PROGRAM, TargetType.STATIC_LIBRARY, TargetType.SHARED_LIBRARY):
            return True
    return False

def post_finalize(**kwargs) -> None:
    if not _should_generate():
        return

    cache_file = Path(spp.env['CACHE_DIR']) / 'config_cache.json'

    cache = {}
    if cache_file.exists():
        try:
            with cache_file.open('r') as f:
                cache = json.load(f)
        except Exception as e:
            spp.env.Warn(f'Error while loading config cache: {e}.')

    cache['build_type'] = spp.env['BUILD_TYPE']

    try:
        with cache_file.open('w') as f:
            json.dump(cache, f)
    except Exception as e:
        spp.env.Warn(f'Error while saving config cache: {e}.')