import os

import pytest
import pymysql

from .utils import run, dbtest, set_expanded_output, is_expanded_output


def assert_result_equal(result, title=None, rows=None, headers=None,
                        status=None, auto_status=True, assert_contains=False):
    """Assert that an sqlexecute.run() result matches the expected values."""
    if status is None and auto_status and rows:
        status = '{} row{} in set'.format(
            len(rows), 's' if len(rows) > 1 else '')
    fields = {'title': title, 'rows': rows, 'headers': headers,
              'status': status}

    if assert_contains:
        # Do a loose match on the results using the *in* operator.
        for key, field in fields.items():
            if field:
                assert field in result[0][key]
    else:
        # Do an exact match on the fields.
        assert result == [fields]


@dbtest
def test_conn(executor):
    run(executor, '''create table test(a text)''')
    run(executor, '''insert into test values('abc')''')
    results = run(executor, '''select * from test''')

    assert_result_equal(results, headers=['a'], rows=[('abc',)])


@dbtest
def test_bools(executor):
    run(executor, '''create table test(a boolean)''')
    run(executor, '''insert into test values(True)''')
    results = run(executor, '''select * from test''')

    assert_result_equal(results, headers=['a'], rows=[(1,)])


@dbtest
def test_binary(executor):
    run(executor, '''create table bt(geom linestring NOT NULL)''')
    run(executor, "INSERT INTO bt VALUES "
        "(ST_GeomFromText('LINESTRING(116.37604 39.73979,116.375 39.73965)'));")
    results = run(executor, '''select * from bt''')

    geom = (b'\x00\x00\x00\x00\x01\x02\x00\x00\x00\x02\x00\x00\x009\x7f\x13\n'
            b'\x11\x18]@4\xf4Op\xb1\xdeC@\x00\x00\x00\x00\x00\x18]@B>\xe8\xd9'
            b'\xac\xdeC@')

    assert_result_equal(results, headers=['geom'], rows=[(geom,)])


@dbtest
def test_table_and_columns_query(executor):
    run(executor, "create table a(x text, y text)")
    run(executor, "create table b(z text)")

    assert set(executor.tables()) == set([('a',), ('b',)])
    assert set(executor.table_columns()) == set(
        [('a', 'x'), ('a', 'y'), ('b', 'z')])


@dbtest
def test_database_list(executor):
    databases = executor.databases()
    assert '_test_db' in databases


@dbtest
def test_invalid_syntax(executor):
    with pytest.raises(pymysql.ProgrammingError) as excinfo:
        run(executor, 'invalid syntax!')
    assert 'You have an error in your SQL syntax;' in str(excinfo.value)


@dbtest
def test_invalid_column_name(executor):
    with pytest.raises(pymysql.err.OperationalError) as excinfo:
        run(executor, 'select invalid command')
    assert "Unknown column 'invalid' in 'field list'" in str(excinfo.value)


@dbtest
def test_unicode_support_in_output(executor):
    run(executor, "create table unicodechars(t text)")
    run(executor, u"insert into unicodechars (t) values ('é')")

    # See issue #24, this raises an exception without proper handling
    results = run(executor, u"select * from unicodechars")
    assert_result_equal(results, headers=['t'], rows=[(u'é',)])


@dbtest
def test_multiple_queries_same_line(executor):
    results = run(executor, "select 'foo'; select 'bar'")

    expected = [{'title': None, 'headers': ['foo'], 'rows': [('foo',)],
                 'status': '1 row in set'},
                {'title': None, 'headers': ['bar'], 'rows': [('bar',)],
                 'status': '1 row in set'}]
    assert expected == results


@dbtest
def test_multiple_queries_same_line_syntaxerror(executor):
    with pytest.raises(pymysql.ProgrammingError) as excinfo:
        run(executor, "select 'foo'; invalid syntax")
    assert 'You have an error in your SQL syntax;' in str(excinfo.value)


@dbtest
def test_favorite_query(executor):
    set_expanded_output(False)
    run(executor, "create table test(a text)")
    run(executor, "insert into test values('abc')")
    run(executor, "insert into test values('def')")

    results = run(executor, "\\fs test-a select * from test where a like 'a%'")
    assert_result_equal(results, status='Saved.')

    results = run(executor, "\\f test-a")
    assert_result_equal(results,
                        title="> select * from test where a like 'a%'",
                        headers=['a'], rows=[('abc',)], auto_status=False)

    results = run(executor, "\\fd test-a")
    assert_result_equal(results, status='test-a: Deleted')


@dbtest
def test_favorite_query_multiple_statement(executor):
    set_expanded_output(False)
    run(executor, "create table test(a text)")
    run(executor, "insert into test values('abc')")
    run(executor, "insert into test values('def')")

    results = run(executor,
                  "\\fs test-ad select * from test where a like 'a%'; "
                  "select * from test where a like 'd%'")
    assert_result_equal(results, status='Saved.')

    results = run(executor, "\\f test-ad")
    expected = [{'title': "> select * from test where a like 'a%'",
                 'headers': ['a'], 'rows': [('abc',)], 'status': None},
                {'title': "> select * from test where a like 'd%'",
                 'headers': ['a'], 'rows': [('def',)], 'status': None}]
    assert expected == results

    results = run(executor, "\\fd test-ad")
    assert_result_equal(results, status='test-ad: Deleted')


@dbtest
def test_favorite_query_expanded_output(executor):
    set_expanded_output(False)
    run(executor, '''create table test(a text)''')
    run(executor, '''insert into test values('abc')''')

    results = run(executor, "\\fs test-ae select * from test")
    assert_result_equal(results, status='Saved.')

    results = run(executor, "\\f test-ae \\G")
    assert is_expanded_output() is True
    assert_result_equal(results, title='> select * from test',
                        headers=['a'], rows=[('abc',)], auto_status=False)

    set_expanded_output(False)

    results = run(executor, "\\fd test-ae")
    assert_result_equal(results, status='test-ae: Deleted')


@dbtest
def test_special_command(executor):
    results = run(executor, '\\?')
    assert_result_equal(results, rows=('quit', '\\q', 'Quit.'),
                        headers='Command', assert_contains=True,
                        auto_status=False)


@dbtest
def test_cd_command_without_a_folder_name(executor):
    results = run(executor, 'system cd')
    assert_result_equal(results, status='No folder name was provided.')


@dbtest
def test_system_command_not_found(executor):
    results = run(executor, 'system xyz')
    assert_result_equal(results, status='OSError: No such file or directory',
                        assert_contains=True)


@dbtest
def test_system_command_output(executor):
    test_dir = os.path.abspath(os.path.dirname(__file__))
    test_file_path = os.path.join(test_dir, 'test.txt')
    results = run(executor, 'system cat {0}'.format(test_file_path))
    assert_result_equal(results, status='mycli rocks!\n')


@dbtest
def test_cd_command_current_dir(executor):
    test_path = os.path.abspath(os.path.dirname(__file__))
    run(executor, 'system cd {0}'.format(test_path))
    assert os.getcwd() == test_path


@dbtest
def test_unicode_support(executor):
    results = run(executor, u"SELECT '日本語' AS japanese;")
    assert_result_equal(results, headers=['japanese'], rows=[(u'日本語',)])


@dbtest
def test_timestamp_null(executor):
    run(executor, '''create table ts_null(a timestamp null)''')
    run(executor, '''insert into ts_null values(null)''')
    results = run(executor, '''select * from ts_null''')
    assert_result_equal(results, headers=['a'],
                        rows=[(None,)])


@dbtest
def test_datetime_null(executor):
    run(executor, '''create table dt_null(a datetime null)''')
    run(executor, '''insert into dt_null values(null)''')
    results = run(executor, '''select * from dt_null''')
    assert_result_equal(results, headers=['a'],
                        rows=[(None,)])


@dbtest
def test_date_null(executor):
    run(executor, '''create table date_null(a date null)''')
    run(executor, '''insert into date_null values(null)''')
    results = run(executor, '''select * from date_null''')
    assert_result_equal(results, headers=['a'], rows=[(None,)])


@dbtest
def test_time_null(executor):
    run(executor, '''create table time_null(a time null)''')
    run(executor, '''insert into time_null values(null)''')
    results = run(executor, '''select * from time_null''')
    assert_result_equal(results, headers=['a'], rows=[(None,)])


@dbtest
def test_multiple_results(executor):
    query = '''CREATE PROCEDURE dmtest()
        BEGIN
          SELECT 1;
          SELECT 2;
        END'''
    executor.conn.cursor().execute(query)

    results = run(executor, 'call dmtest;')
    expected = [
        {'title': None, 'rows': [(1,)], 'headers': ['1'],
         'status': '1 row in set'},
        {'title': None, 'rows': [(2,)], 'headers': ['2'],
         'status': '1 row in set'}
    ]
    assert results == expected