# standard imports
import logging
import unittest

# bsie imports
from bsie.extractor import ExtractorBuilder
from bsie.reader import ReaderBuilder
from bsie.utils import bsfs

# objects to test
from bsie.lib import PipelineBuilder


## code ##

class TestPipelineBuilder(unittest.TestCase):
    def test_build(self):
        c_schema = '''
            bse:author rdfs:subClassOf bsfs:Predicate ;
                rdfs:domain bsn:Entity ;
                rdfs:range xsd:string ;
                bsfs:unique "true"^^xsd:boolean .
            '''
        c_tuples = [('https://schema.bsfs.io/ie/Node/Entity#author', 'Me, myself, and I')]
        # prepare builders
        rbuild = ReaderBuilder({})
        ebuild = ExtractorBuilder([
            {'bsie.extractor.generic.path.Path': {}},
            {'bsie.extractor.generic.stat.Stat': {}},
            {'bsie.extractor.generic.constant.Constant': dict(
                schema=c_schema,
                tuples=c_tuples,
                )},
            ])
        # build pipeline
        builder = PipelineBuilder(rbuild, ebuild)
        pipeline = builder.build()
        # delayed import
        import bsie.reader.path
        import bsie.reader.stat
        import bsie.extractor.generic.path
        import bsie.extractor.generic.stat
        import bsie.extractor.generic.constant
        # check pipeline
        self.assertDictEqual(pipeline._ext2rdr, {
            bsie.extractor.generic.path.Path(): bsie.reader.path.Path(),
            bsie.extractor.generic.stat.Stat(): bsie.reader.stat.Stat(),
            bsie.extractor.generic.constant.Constant(c_schema, c_tuples): None,
            })

        # fail to load extractor
        ebuild_err = ExtractorBuilder([
            {'bsie.extractor.generic.foo.Foo': {}},
            {'bsie.extractor.generic.path.Path': {}},
            ])
        with self.assertLogs(logging.getLogger('bsie.lib.builder'), logging.ERROR):
            pipeline = PipelineBuilder(rbuild, ebuild_err).build()
            self.assertDictEqual(pipeline._ext2rdr, {
                bsie.extractor.generic.path.Path(): bsie.reader.path.Path()})

        # fail to build extractor
        ebuild_err = ExtractorBuilder([
            {'bsie.extractor.generic.path.Path': {'foo': 123}},
            {'bsie.extractor.generic.path.Path': {}},
            ])
        with self.assertLogs(logging.getLogger('bsie.lib.builder'), logging.ERROR):
            pipeline = PipelineBuilder(rbuild, ebuild_err).build()
            self.assertDictEqual(pipeline._ext2rdr, {
                bsie.extractor.generic.path.Path(): bsie.reader.path.Path()})

        # fail to load reader
        with self.assertLogs(logging.getLogger('bsie.lib.builder'), logging.ERROR):
            # switch reader of an extractor
            old_reader = bsie.extractor.generic.path.Path.CONTENT_READER
            bsie.extractor.generic.path.Path.CONTENT_READER = 'bsie.reader.foo.Foo'
            # build pipeline with invalid reader reference
            pipeline = PipelineBuilder(rbuild, ebuild).build()
            self.assertDictEqual(pipeline._ext2rdr, {
                bsie.extractor.generic.stat.Stat(): bsie.reader.stat.Stat(),
                bsie.extractor.generic.constant.Constant(c_schema, c_tuples): None,
                })
            # switch back
            bsie.extractor.generic.path.Path.CONTENT_READER = old_reader

        # fail to build reader
        rbuild_err = ReaderBuilder({'bsie.reader.stat.Stat': dict(foo=123)})
        with self.assertLogs(logging.getLogger('bsie.lib.builder'), logging.ERROR):
            pipeline = PipelineBuilder(rbuild_err, ebuild).build()
            self.assertDictEqual(pipeline._ext2rdr, {
                bsie.extractor.generic.path.Path(): bsie.reader.path.Path(),
                bsie.extractor.generic.constant.Constant(c_schema, c_tuples): None,
                })


## main ##

if __name__ == '__main__':
    unittest.main()

## EOF ##