import unittest

import agate

from datetime import datetime
from decimal import Decimal
from isodate import tzinfo
import os
from shutil import rmtree
from tempfile import mkdtemp
from dbt.clients import agate_helper

SAMPLE_CSV_DATA = """a,b,c,d,e,f,g
1,n,test,3.2,20180806T11:33:29.320Z,True,NULL
2,y,asdf,900,20180806T11:35:29.320Z,False,a string"""

SAMPLE_CSV_BOM_DATA = u'\ufeff' + SAMPLE_CSV_DATA


EXPECTED = [
    [
        1, 'n', 'test', Decimal('3.2'),
        datetime(2018, 8, 6, 11, 33, 29, 320000, tzinfo=tzinfo.Utc()),
        True, None,
    ],
    [
        2, 'y', 'asdf', 900,
        datetime(2018, 8, 6, 11, 35, 29, 320000, tzinfo=tzinfo.Utc()),
        False, 'a string',
    ],
]


EXPECTED_STRINGS = [
    ['1', 'n', 'test', '3.2', '20180806T11:33:29.320Z', 'True', None],
    ['2', 'y', 'asdf', '900', '20180806T11:35:29.320Z', 'False', 'a string'],
]


class TestAgateHelper(unittest.TestCase):
    def setUp(self):
        self.tempdir = mkdtemp()

    def tearDown(self):
        rmtree(self.tempdir)

    def test_from_csv(self):
        path = os.path.join(self.tempdir, 'input.csv')
        with open(path, 'wb') as fp:
            fp.write(SAMPLE_CSV_DATA.encode('utf-8'))
        tbl = agate_helper.from_csv(path, ())
        self.assertEqual(len(tbl), len(EXPECTED))
        for idx, row in enumerate(tbl):
            self.assertEqual(list(row), EXPECTED[idx])

    def test_bom_from_csv(self):
        path = os.path.join(self.tempdir, 'input.csv')
        with open(path, 'wb') as fp:
            fp.write(SAMPLE_CSV_BOM_DATA.encode('utf-8'))
        tbl = agate_helper.from_csv(path, ())
        self.assertEqual(len(tbl), len(EXPECTED))
        for idx, row in enumerate(tbl):
            self.assertEqual(list(row), EXPECTED[idx])

    def test_from_csv_all_reserved(self):
        path = os.path.join(self.tempdir, 'input.csv')
        with open(path, 'wb') as fp:
            fp.write(SAMPLE_CSV_DATA.encode('utf-8'))
        tbl = agate_helper.from_csv(path, tuple('abcdefg'))
        self.assertEqual(len(tbl), len(EXPECTED_STRINGS))
        for expected, row in zip(EXPECTED_STRINGS, tbl):
            self.assertEqual(list(row), expected)

    def test_from_data(self):
        column_names = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
        data = [
            {'a': '1', 'b': 'n', 'c': 'test', 'd': '3.2',
             'e': '20180806T11:33:29.320Z', 'f': 'True', 'g': 'NULL'},
            {'a': '2', 'b': 'y', 'c': 'asdf', 'd': '900',
             'e': '20180806T11:35:29.320Z', 'f': 'False', 'g': 'a string'}
        ]
        tbl = agate_helper.table_from_data(data, column_names)
        self.assertEqual(len(tbl), len(EXPECTED))
        for idx, row in enumerate(tbl):
            self.assertEqual(list(row), EXPECTED[idx])

    def test_datetime_formats(self):
        path = os.path.join(self.tempdir, 'input.csv')
        datetimes = [
            '20180806T11:33:29.000Z',
            '20180806T11:33:29Z',
            '20180806T113329Z',
        ]
        expected = datetime(2018, 8, 6, 11, 33, 29, 0, tzinfo=tzinfo.Utc())
        for dt in datetimes:
            with open(path, 'wb') as fp:
                fp.write('a\n{}'.format(dt).encode('utf-8'))
            tbl = agate_helper.from_csv(path, ())
            self.assertEqual(tbl[0][0], expected)

    def test_merge_allnull(self):
        t1 = agate.Table([(1, 'a', None), (2, 'b', None)], ('a', 'b', 'c'))
        t2 = agate.Table([(3, 'c', None), (4, 'd', None)], ('a', 'b', 'c'))
        result = agate_helper.merge_tables([t1, t2])
        self.assertEqual(result.column_names, ('a', 'b', 'c'))
        assert isinstance(result.column_types[0], agate.data_types.Number)
        assert isinstance(result.column_types[1], agate.data_types.Text)
        assert isinstance(result.column_types[2], agate.data_types.Number)
        self.assertEqual(len(result), 4)

    def test_merge_mixed(self):
        t1 = agate.Table([(1, 'a', None), (2, 'b', None)], ('a', 'b', 'c'))
        t2 = agate.Table([(3, 'c', 'dog'), (4, 'd', 'cat')], ('a', 'b', 'c'))
        t3 = agate.Table([(3, 'c', None), (4, 'd', None)], ('a', 'b', 'c'))

        result = agate_helper.merge_tables([t1, t2])
        self.assertEqual(result.column_names, ('a', 'b', 'c'))
        assert isinstance(result.column_types[0], agate.data_types.Number)
        assert isinstance(result.column_types[1], agate.data_types.Text)
        assert isinstance(result.column_types[2], agate.data_types.Text)
        self.assertEqual(len(result), 4)

        result = agate_helper.merge_tables([t2, t3])
        self.assertEqual(result.column_names, ('a', 'b', 'c'))
        assert isinstance(result.column_types[0], agate.data_types.Number)
        assert isinstance(result.column_types[1], agate.data_types.Text)
        assert isinstance(result.column_types[2], agate.data_types.Text)
        self.assertEqual(len(result), 4)

        result = agate_helper.merge_tables([t1, t2, t3])
        self.assertEqual(result.column_names, ('a', 'b', 'c'))
        assert isinstance(result.column_types[0], agate.data_types.Number)
        assert isinstance(result.column_types[1], agate.data_types.Text)
        assert isinstance(result.column_types[2], agate.data_types.Text)
        self.assertEqual(len(result), 6)