"""
Module for access to simple data for demo and testing purposes.
"""

__devnotes__ = """
mkinit -m watch.demo --lazy -w
"""


def lazy_import(module_name, submodules, submod_attrs):
    import importlib
    import os
    name_to_submod = {
        func: mod for mod, funcs in submod_attrs.items()
        for func in funcs
    }

    def __getattr__(name):
        if name in submodules:
            attr = importlib.import_module(
                '{module_name}.{name}'.format(
                    module_name=module_name, name=name)
            )
        elif name in name_to_submod:
            submodname = name_to_submod[name]
            module = importlib.import_module(
                '{module_name}.{submodname}'.format(
                    module_name=module_name, submodname=submodname)
            )
            attr = getattr(module, name)
        else:
            raise AttributeError(
                'No {module_name} attribute {name}'.format(
                    module_name=module_name, name=name))
        globals()[name] = attr
        return attr

    if os.environ.get('EAGER_IMPORT', ''):
        for name in name_to_submod.values():
            __getattr__(name)

        for attrs in submod_attrs.values():
            for attr in attrs:
                __getattr__(attr)
    return __getattr__


__getattr__ = lazy_import(
    __name__,
    submodules={
        'dummy_demodata',
        'landsat_demodata',
        'nitf_demodata',
        'sentinel2_demodata',
        'smart_kwcoco_demodata',
        'stac_demo',
    },
    submod_attrs={
        'dummy_demodata': [
            'dummy_rpc_geotiff_fpath',
        ],
        'landsat_demodata': [
            'grab_landsat_product',
        ],
        'nitf_demodata': [
            'DEFAULT_KEY',
            'grab_nitf_fpath',
        ],
        'sentinel2_demodata': [
            'grab_sentinel2_product',
        ],
        'smart_kwcoco_demodata': [
            'coerce_kwcoco',
            'demo_kwcoco_multisensor',
            'demo_kwcoco_with_heatmaps',
            'hack_seed_geometadata_in_dset',
        ],
        'stac_demo': [
            'demo',
        ],
    },
)


def __dir__():
    return __all__


__all__ = ['DEFAULT_KEY', 'coerce_kwcoco', 'demo', 'demo_kwcoco_multisensor',
           'demo_kwcoco_with_heatmaps', 'dummy_demodata',
           'dummy_rpc_geotiff_fpath', 'grab_landsat_product',
           'grab_nitf_fpath', 'grab_sentinel2_product',
           'hack_seed_geometadata_in_dset', 'landsat_demodata',
           'nitf_demodata', 'sentinel2_demodata', 'smart_kwcoco_demodata',
           'stac_demo']
