import pytest
from pgcli.packages.parseutils import is_destructive
from pgcli.packages.parseutils.tables import extract_tables
from pgcli.packages.parseutils.utils import find_prev_keyword, is_open_quote


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, False),)


@pytest.mark.parametrize(
    "sql", ['select * from "abc"."def"', 'select * from abc."def"']
)
def test_simple_select_single_table_schema_qualified_quoted_table(sql):
    tables = extract_tables(sql)
    assert tables == (("abc", "def", '"def"', False),)


@pytest.mark.parametrize("sql", ["select * from abc.def", 'select * from "abc".def'])
def test_simple_select_single_table_schema_qualified(sql):
    tables = extract_tables(sql)
    assert tables == (("abc", "def", None, False),)


def test_simple_select_single_table_double_quoted():
    tables = extract_tables('select * from "Abc"')
    assert tables == ((None, "Abc", None, False),)


def test_simple_select_multiple_tables():
    tables = extract_tables("select * from abc, def")
    assert set(tables) == {(None, "abc", None, False), (None, "def", None, False)}


def test_simple_select_multiple_tables_double_quoted():
    tables = extract_tables('select * from "Abc", "Def"')
    assert set(tables) == {(None, "Abc", None, False), (None, "Def", None, False)}


def test_simple_select_single_table_deouble_quoted_aliased():
    tables = extract_tables('select * from "Abc" a')
    assert tables == ((None, "Abc", "a", False),)


def test_simple_select_multiple_tables_deouble_quoted_aliased():
    tables = extract_tables('select * from "Abc" a, "Def" d')
    assert set(tables) == {(None, "Abc", "a", False), (None, "Def", "d", False)}


def test_simple_select_multiple_tables_schema_qualified():
    tables = extract_tables("select * from abc.def, ghi.jkl")
    assert set(tables) == {("abc", "def", None, False), ("ghi", "jkl", None, False)}


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


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


def test_simple_select_with_cols_multiple_tables():
    tables = extract_tables("select a,b from abc, def")
    assert set(tables) == {(None, "abc", None, False), (None, "def", None, False)}


def test_simple_select_with_cols_multiple_qualified_tables():
    tables = extract_tables("select a,b from abc.def, def.ghi")
    assert set(tables) == {("abc", "def", None, False), ("def", "ghi", None, False)}


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


def test_select_with_hanging_comma_multiple_tables():
    tables = extract_tables("select a, from abc, def")
    assert set(tables) == {(None, "abc", None, False), (None, "def", None, False)}


def test_select_with_hanging_period_multiple_tables():
    tables = extract_tables("SELECT t1. FROM tabl1 t1, tabl2 t2")
    assert set(tables) == {(None, "tabl1", "t1", False), (None, "tabl2", "t2", False)}


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
    # AND mistakenly identifies the field list as
    # assert tables == ((None, 'abc', 'abc', False),)

    assert tables == ((None, "abc", "abc", False),)


@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, False),)


def test_simple_update_table_no_schema():
    tables = extract_tables("update abc set id = 1")
    assert tables == ((None, "abc", None, False),)


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


@pytest.mark.parametrize("join_type", ["", "INNER", "LEFT", "RIGHT OUTER"])
def test_join_table(join_type):
    sql = f"SELECT * FROM abc a {join_type} JOIN def d ON a.id = d.num"
    tables = extract_tables(sql)
    assert set(tables) == {(None, "abc", "a", False), (None, "def", "d", False)}


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


def test_incomplete_join_clause():
    sql = """select a.x, b.y
             from abc a join bcd b
             on a.id = """
    tables = extract_tables(sql)
    assert tables == ((None, "abc", "a", False), (None, "bcd", "b", False))


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


def test_multiple_joins():
    sql = """select * from t1
            inner join t2 ON
              t1.id = t2.t1_id
            inner join t3 ON
              t2.id = t3."""
    tables = extract_tables(sql)
    assert tables == (
        (None, "t1", None, False),
        (None, "t2", None, False),
        (None, "t3", None, False),
    )


def test_subselect_tables():
    sql = "SELECT * FROM (SELECT  FROM abc"
    tables = extract_tables(sql)
    assert tables == ((None, "abc", None, False),)


@pytest.mark.parametrize("text", ["SELECT * FROM foo.", "SELECT 123 AS foo"])
def test_extract_no_tables(text):
    tables = extract_tables(text)
    assert tables == tuple()


@pytest.mark.parametrize("arg_list", ["", "arg1", "arg1, arg2, arg3"])
def test_simple_function_as_table(arg_list):
    tables = extract_tables(f"SELECT * FROM foo({arg_list})")
    assert tables == ((None, "foo", None, True),)


@pytest.mark.parametrize("arg_list", ["", "arg1", "arg1, arg2, arg3"])
def test_simple_schema_qualified_function_as_table(arg_list):
    tables = extract_tables(f"SELECT * FROM foo.bar({arg_list})")
    assert tables == (("foo", "bar", None, True),)


@pytest.mark.parametrize("arg_list", ["", "arg1", "arg1, arg2, arg3"])
def test_simple_aliased_function_as_table(arg_list):
    tables = extract_tables(f"SELECT * FROM foo({arg_list}) bar")
    assert tables == ((None, "foo", "bar", True),)


def test_simple_table_and_function():
    tables = extract_tables("SELECT * FROM foo JOIN bar()")
    assert set(tables) == {(None, "foo", None, False), (None, "bar", None, True)}


def test_complex_table_and_function():
    tables = extract_tables(
        """SELECT * FROM foo.bar baz
                               JOIN bar.qux(x, y, z) quux"""
    )
    assert set(tables) == {("foo", "bar", "baz", False), ("bar", "qux", "quux", True)}


def test_find_prev_keyword_using():
    q = "select * from tbl1 inner join tbl2 using (col1, "
    kw, q2 = find_prev_keyword(q)
    assert kw.value == "(" and q2 == "select * from tbl1 inner join tbl2 using ("


@pytest.mark.parametrize(
    "sql",
    [
        "select * from foo where bar",
        "select * from foo where bar = 1 and baz or ",
        "select * from foo where bar = 1 and baz between qux and ",
    ],
)
def test_find_prev_keyword_where(sql):
    kw, stripped = find_prev_keyword(sql)
    assert kw.value == "where" and stripped == "select * from foo where"


@pytest.mark.parametrize(
    "sql", ["create table foo (bar int, baz ", "select * from foo() as bar (baz "]
)
def test_find_prev_keyword_open_parens(sql):
    kw, _ = find_prev_keyword(sql)
    assert kw.value == "("


@pytest.mark.parametrize(
    "sql",
    [
        "",
        "$$ foo $$",
        "$$ 'foo' $$",
        '$$ "foo" $$',
        "$$ $a$ $$",
        "$a$ $$ $a$",
        "foo bar $$ baz $$",
    ],
)
def test_is_open_quote__closed(sql):
    assert not is_open_quote(sql)


@pytest.mark.parametrize(
    "sql",
    [
        "$$",
        ";;;$$",
        "foo $$ bar $$; foo $$",
        "$$ foo $a$",
        "foo 'bar baz",
        "$a$ foo ",
        '$$ "foo" ',
        "$$ $a$ ",
        "foo bar $$ baz",
    ],
)
def test_is_open_quote__open(sql):
    assert is_open_quote(sql)


@pytest.mark.parametrize(
    ("sql", "warning_level", "expected"),
    [
        ("update abc set x = 1", "all", True),
        ("update abc set x = 1 where y = 2", "all", True),
        ("update abc set x = 1", "moderate", True),
        ("update abc set x = 1 where y = 2", "moderate", False),
        ("select x, y, z from abc", "all", False),
        ("drop abc", "all", True),
        ("alter abc", "all", True),
        ("delete abc", "all", True),
        ("truncate abc", "all", True),
    ],
)
def test_is_destructive(sql, warning_level, expected):
    assert is_destructive(sql, warning_level=warning_level) == expected
