import pytest
from litecli.packages.parseutils import (
    extract_tables,
    query_starts_with,
    queries_start_with,
    is_destructive,
)


def test_empty_string():
    tables = extract_tables("")
    assert tables == []


def test_simple_select_single_table():
    tables = extract_tables("select * from abc")
    assert tables == [(None, "abc", None)]


def test_simple_select_single_table_schema_qualified():
    tables = extract_tables("select * from abc.def")
    assert tables == [("abc", "def", None)]


def test_simple_select_multiple_tables():
    tables = extract_tables("select * from abc, def")
    assert sorted(tables) == [(None, "abc", None), (None, "def", None)]


def test_simple_select_multiple_tables_schema_qualified():
    tables = extract_tables("select * from abc.def, ghi.jkl")
    assert sorted(tables) == [("abc", "def", None), ("ghi", "jkl", None)]


def test_simple_select_with_cols_single_table():
    tables = extract_tables("select a,b from abc")
    assert tables == [(None, "abc", None)]


def test_simple_select_with_cols_single_table_schema_qualified():
    tables = extract_tables("select a,b from abc.def")
    assert tables == [("abc", "def", None)]


def test_simple_select_with_cols_multiple_tables():
    tables = extract_tables("select a,b from abc, def")
    assert sorted(tables) == [(None, "abc", None), (None, "def", None)]


def test_simple_select_with_cols_multiple_tables_with_schema():
    tables = extract_tables("select a,b from abc.def, def.ghi")
    assert sorted(tables) == [("abc", "def", None), ("def", "ghi", None)]


def test_select_with_hanging_comma_single_table():
    tables = extract_tables("select a, from abc")
    assert tables == [(None, "abc", None)]


def test_select_with_hanging_comma_multiple_tables():
    tables = extract_tables("select a, from abc, def")
    assert sorted(tables) == [(None, "abc", None), (None, "def", None)]


def test_select_with_hanging_period_multiple_tables():
    tables = extract_tables("SELECT t1. FROM tabl1 t1, tabl2 t2")
    assert sorted(tables) == [(None, "tabl1", "t1"), (None, "tabl2", "t2")]


def test_simple_insert_single_table():
    tables = extract_tables('insert into abc (id, name) values (1, "def")')

    # sqlparse mistakenly assigns an alias to the table
    # assert tables == [(None, 'abc', None)]
    assert tables == [(None, "abc", "abc")]


@pytest.mark.xfail
def test_simple_insert_single_table_schema_qualified():
    tables = extract_tables('insert into abc.def (id, name) values (1, "def")')
    assert tables == [("abc", "def", None)]


def test_simple_update_table():
    tables = extract_tables("update abc set id = 1")
    assert tables == [(None, "abc", None)]


def test_simple_update_table_with_schema():
    tables = extract_tables("update abc.def set id = 1")
    assert tables == [("abc", "def", None)]


def test_join_table():
    tables = extract_tables("SELECT * FROM abc a JOIN def d ON a.id = d.num")
    assert sorted(tables) == [(None, "abc", "a"), (None, "def", "d")]


def test_join_table_schema_qualified():
    tables = extract_tables("SELECT * FROM abc.def x JOIN ghi.jkl y ON x.id = y.num")
    assert tables == [("abc", "def", "x"), ("ghi", "jkl", "y")]


def test_join_as_table():
    tables = extract_tables("SELECT * FROM my_table AS m WHERE m.a > 5")
    assert tables == [(None, "my_table", "m")]


def test_query_starts_with():
    query = "USE test;"
    assert query_starts_with(query, ("use",)) is True

    query = "DROP DATABASE test;"
    assert query_starts_with(query, ("use",)) is False


def test_query_starts_with_comment():
    query = "# comment\nUSE test;"
    assert query_starts_with(query, ("use",)) is True


def test_queries_start_with():
    sql = "# comment\n" "show databases;" "use foo;"
    assert queries_start_with(sql, ("show", "select")) is True
    assert queries_start_with(sql, ("use", "drop")) is True
    assert queries_start_with(sql, ("delete", "update")) is False


def test_is_destructive():
    sql = "use test;\n" "show databases;\n" "drop database foo;"
    assert is_destructive(sql) is True