import unittest
from unittest.mock import patch

from sqlglot import Parser, exp, parse, parse_one
from sqlglot.errors import ErrorLevel, ParseError
from tests.helpers import assert_logger_contains


class TestParser(unittest.TestCase):
    def test_parse_empty(self):
        with self.assertRaises(ParseError) as ctx:
            parse_one("")

    def test_parse_into(self):
        self.assertIsInstance(parse_one("left join foo", into=exp.Join), exp.Join)
        self.assertIsInstance(parse_one("int", into=exp.DataType), exp.DataType)
        self.assertIsInstance(parse_one("array<int>", into=exp.DataType), exp.DataType)

    def test_parse_into_error(self):
        expected_message = "Failed to parse into [<class 'sqlglot.expressions.From'>]"
        expected_errors = [
            {
                "description": "Invalid expression / Unexpected token",
                "line": 1,
                "col": 1,
                "start_context": "",
                "highlight": "SELECT",
                "end_context": " 1;",
                "into_expression": exp.From,
            }
        ]
        with self.assertRaises(ParseError) as ctx:
            parse_one("SELECT 1;", "sqlite", [exp.From])
        self.assertEqual(str(ctx.exception), expected_message)
        self.assertEqual(ctx.exception.errors, expected_errors)

    def test_parse_into_errors(self):
        expected_message = "Failed to parse into [<class 'sqlglot.expressions.From'>, <class 'sqlglot.expressions.Join'>]"
        expected_errors = [
            {
                "description": "Invalid expression / Unexpected token",
                "line": 1,
                "col": 1,
                "start_context": "",
                "highlight": "SELECT",
                "end_context": " 1;",
                "into_expression": exp.From,
            },
            {
                "description": "Invalid expression / Unexpected token",
                "line": 1,
                "col": 1,
                "start_context": "",
                "highlight": "SELECT",
                "end_context": " 1;",
                "into_expression": exp.Join,
            },
        ]
        with self.assertRaises(ParseError) as ctx:
            parse_one("SELECT 1;", "sqlite", [exp.From, exp.Join])
        self.assertEqual(str(ctx.exception), expected_message)
        self.assertEqual(ctx.exception.errors, expected_errors)

    def test_column(self):
        columns = parse_one("select a, ARRAY[1] b, case when 1 then 1 end").find_all(exp.Column)
        assert len(list(columns)) == 1

        self.assertIsNotNone(parse_one("date").find(exp.Column))

    def test_float(self):
        self.assertEqual(parse_one(".2"), parse_one("0.2"))

    def test_unary_plus(self):
        self.assertEqual(parse_one("+15"), exp.Literal.number(15))

    def test_table(self):
        tables = [t.sql() for t in parse_one("select * from a, b.c, .d").find_all(exp.Table)]
        self.assertEqual(tables, ["a", "b.c", "d"])

    def test_union_order(self):
        self.assertIsInstance(parse_one("SELECT * FROM (SELECT 1) UNION SELECT 2"), exp.Union)

    def test_select(self):
        self.assertIsNotNone(parse_one("select 1 natural"))
        self.assertIsNotNone(parse_one("select * from (select 1) x order by x.y").args["order"])
        self.assertIsNotNone(
            parse_one("select * from x where a = (select 1) order by x.y").args["order"]
        )
        self.assertEqual(len(parse_one("select * from (select 1) x cross join y").args["joins"]), 1)
        self.assertEqual(
            parse_one("""SELECT * FROM x CROSS JOIN y, z LATERAL VIEW EXPLODE(y)""").sql(),
            """SELECT * FROM x, z CROSS JOIN y LATERAL VIEW EXPLODE(y)""",
        )
        self.assertIsNone(
            parse_one("create table a as (select b from c) index").find(exp.TableAlias)
        )

    def test_command(self):
        expressions = parse("SET x = 1; ADD JAR s3://a; SELECT 1", read="hive")
        self.assertEqual(len(expressions), 3)
        self.assertEqual(expressions[0].sql(), "SET x = 1")
        self.assertEqual(expressions[1].sql(), "ADD JAR s3://a")
        self.assertEqual(expressions[2].sql(), "SELECT 1")

    def test_lambda_struct(self):
        expression = parse_one("FILTER(a.b, x -> x.id = id)")
        lambda_expr = expression.expression

        self.assertIsInstance(lambda_expr.this.this, exp.Dot)
        self.assertEqual(lambda_expr.sql(), "x -> x.id = id")

    def test_transactions(self):
        expression = parse_one("BEGIN TRANSACTION")
        self.assertIsNone(expression.this)
        self.assertEqual(expression.args["modes"], [])
        self.assertEqual(expression.sql(), "BEGIN")

        expression = parse_one("START TRANSACTION", read="mysql")
        self.assertIsNone(expression.this)
        self.assertEqual(expression.args["modes"], [])
        self.assertEqual(expression.sql(), "BEGIN")

        expression = parse_one("BEGIN DEFERRED TRANSACTION")
        self.assertEqual(expression.this, "DEFERRED")
        self.assertEqual(expression.args["modes"], [])
        self.assertEqual(expression.sql(), "BEGIN")

        expression = parse_one(
            "START TRANSACTION READ WRITE, ISOLATION LEVEL SERIALIZABLE", read="presto"
        )
        self.assertIsNone(expression.this)
        self.assertEqual(expression.args["modes"][0], "READ WRITE")
        self.assertEqual(expression.args["modes"][1], "ISOLATION LEVEL SERIALIZABLE")
        self.assertEqual(expression.sql(), "BEGIN")

        expression = parse_one("BEGIN", read="bigquery")
        self.assertNotIsInstance(expression, exp.Transaction)
        self.assertIsNone(expression.expression)
        self.assertEqual(expression.sql(), "BEGIN")

    def test_identify(self):
        expression = parse_one(
            """
            SELECT a, "b", c AS c, d AS "D", e AS "y|z'"
            FROM y."z"
        """
        )

        assert expression.expressions[0].name == "a"
        assert expression.expressions[1].name == "b"
        assert expression.expressions[2].alias == "c"
        assert expression.expressions[3].alias == "D"
        assert expression.expressions[4].alias == "y|z'"
        table = expression.args["from"].expressions[0]
        assert table.this.name == "z"
        assert table.args["db"].name == "y"

    def test_multi(self):
        expressions = parse(
            """
            SELECT * FROM a; SELECT * FROM b;
        """
        )

        assert len(expressions) == 2
        assert expressions[0].args["from"].expressions[0].this.name == "a"
        assert expressions[1].args["from"].expressions[0].this.name == "b"

        expressions = parse("SELECT 1; ; SELECT 2")

        assert len(expressions) == 3
        assert expressions[1] is None

    def test_expression(self):
        ignore = Parser(error_level=ErrorLevel.IGNORE)
        self.assertIsInstance(ignore.expression(exp.Hint, expressions=[""]), exp.Hint)
        self.assertIsInstance(ignore.expression(exp.Hint, y=""), exp.Hint)
        self.assertIsInstance(ignore.expression(exp.Hint), exp.Hint)

        default = Parser(error_level=ErrorLevel.RAISE)
        self.assertIsInstance(default.expression(exp.Hint, expressions=[""]), exp.Hint)
        default.expression(exp.Hint, y="")
        default.expression(exp.Hint)
        self.assertEqual(len(default.errors), 3)

        warn = Parser(error_level=ErrorLevel.WARN)
        warn.expression(exp.Hint, y="")
        self.assertEqual(len(warn.errors), 2)

    def test_parse_errors(self):
        with self.assertRaises(ParseError):
            parse_one("IF(a > 0, a, b, c)")

        with self.assertRaises(ParseError):
            parse_one("IF(a > 0)")

        with self.assertRaises(ParseError):
            parse_one("WITH cte AS (SELECT * FROM x)")

    def test_space(self):
        self.assertEqual(
            parse_one("SELECT ROW() OVER(PARTITION  BY x) FROM x GROUP  BY y").sql(),
            "SELECT ROW() OVER (PARTITION BY x) FROM x GROUP BY y",
        )

        self.assertEqual(
            parse_one(
                """SELECT   * FROM x GROUP
                BY y"""
            ).sql(),
            "SELECT * FROM x GROUP BY y",
        )

    def test_missing_by(self):
        with self.assertRaises(ParseError):
            parse_one("SELECT FROM x ORDER BY")

    def test_parameter(self):
        self.assertEqual(parse_one("SELECT @x, @@x, @1").sql(), "SELECT @x, @@x, @1")

    def test_var(self):
        self.assertEqual(parse_one("SELECT @JOIN, @'foo'").sql(), "SELECT @JOIN, @'foo'")

    def test_comments(self):
        expression = parse_one(
            """
            --comment1.1
            --comment1.2
            SELECT /*comment1.3*/
                a, --comment2
                b as B, --comment3:testing
                "test--annotation",
                c, --comment4 --foo
                e, --
                f -- space
            FROM foo
        """
        )

        self.assertEqual(expression.comments, ["comment1.1", "comment1.2", "comment1.3"])
        self.assertEqual(expression.expressions[0].comments, ["comment2"])
        self.assertEqual(expression.expressions[1].comments, ["comment3:testing"])
        self.assertEqual(expression.expressions[2].comments, None)
        self.assertEqual(expression.expressions[3].comments, ["comment4 --foo"])
        self.assertEqual(expression.expressions[4].comments, [""])
        self.assertEqual(expression.expressions[5].comments, [" space"])

    def test_type_literals(self):
        self.assertEqual(parse_one("int 1"), parse_one("CAST(1 AS INT)"))
        self.assertEqual(parse_one("int.5"), parse_one("CAST(0.5 AS INT)"))
        self.assertEqual(
            parse_one("TIMESTAMP '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMP)"
        )
        self.assertEqual(
            parse_one("TIMESTAMP(1) '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMP(1))"
        )
        self.assertEqual(
            parse_one("TIMESTAMP WITH TIME ZONE '2022-01-01'").sql(),
            "CAST('2022-01-01' AS TIMESTAMPTZ)",
        )
        self.assertEqual(
            parse_one("TIMESTAMP WITH LOCAL TIME ZONE '2022-01-01'").sql(),
            "CAST('2022-01-01' AS TIMESTAMPLTZ)",
        )
        self.assertEqual(
            parse_one("TIMESTAMP WITHOUT TIME ZONE '2022-01-01'").sql(),
            "CAST('2022-01-01' AS TIMESTAMP)",
        )
        self.assertEqual(
            parse_one("TIMESTAMP(1) WITH TIME ZONE '2022-01-01'").sql(),
            "CAST('2022-01-01' AS TIMESTAMPTZ(1))",
        )
        self.assertEqual(
            parse_one("TIMESTAMP(1) WITH LOCAL TIME ZONE '2022-01-01'").sql(),
            "CAST('2022-01-01' AS TIMESTAMPLTZ(1))",
        )
        self.assertEqual(
            parse_one("TIMESTAMP(1) WITHOUT TIME ZONE '2022-01-01'").sql(),
            "CAST('2022-01-01' AS TIMESTAMP(1))",
        )
        self.assertEqual(parse_one("TIMESTAMP(1) WITH TIME ZONE").sql(), "TIMESTAMPTZ(1)")
        self.assertEqual(parse_one("TIMESTAMP(1) WITH LOCAL TIME ZONE").sql(), "TIMESTAMPLTZ(1)")
        self.assertEqual(parse_one("TIMESTAMP(1) WITHOUT TIME ZONE").sql(), "TIMESTAMP(1)")
        self.assertEqual(parse_one("""JSON '{"x":"y"}'""").sql(), """CAST('{"x":"y"}' AS JSON)""")
        self.assertIsInstance(parse_one("TIMESTAMP(1)"), exp.Func)
        self.assertIsInstance(parse_one("TIMESTAMP('2022-01-01')"), exp.Func)
        self.assertIsInstance(parse_one("TIMESTAMP()"), exp.Func)
        self.assertIsInstance(parse_one("map.x"), exp.Column)

    def test_set_expression(self):
        set_ = parse_one("SET")

        self.assertEqual(set_.sql(), "SET")
        self.assertIsInstance(set_, exp.Set)

        set_session = parse_one("SET SESSION x = 1")

        self.assertEqual(set_session.sql(), "SET SESSION x = 1")
        self.assertIsInstance(set_session, exp.Set)

        set_item = set_session.expressions[0]

        self.assertIsInstance(set_item, exp.SetItem)
        self.assertIsInstance(set_item.this, exp.EQ)
        self.assertIsInstance(set_item.this.this, exp.Identifier)
        self.assertIsInstance(set_item.this.expression, exp.Literal)

        self.assertEqual(set_item.args.get("kind"), "SESSION")

        set_to = parse_one("SET x TO 1")

        self.assertEqual(set_to.sql(), "SET x = 1")
        self.assertIsInstance(set_to, exp.Set)

        set_as_command = parse_one("SET DEFAULT ROLE ALL TO USER")

        self.assertEqual(set_as_command.sql(), "SET DEFAULT ROLE ALL TO USER")

        self.assertIsInstance(set_as_command, exp.Command)
        self.assertEqual(set_as_command.this, "SET")
        self.assertEqual(set_as_command.expression, " DEFAULT ROLE ALL TO USER")

    def test_pretty_config_override(self):
        self.assertEqual(parse_one("SELECT col FROM x").sql(), "SELECT col FROM x")
        with patch("sqlglot.pretty", True):
            self.assertEqual(parse_one("SELECT col FROM x").sql(), "SELECT\n  col\nFROM x")

        self.assertEqual(parse_one("SELECT col FROM x").sql(pretty=True), "SELECT\n  col\nFROM x")

    @patch("sqlglot.parser.logger")
    def test_comment_error_n(self, logger):
        parse_one(
            """SUM
(
-- test
)""",
            error_level=ErrorLevel.WARN,
        )

        assert_logger_contains(
            "Required keyword: 'this' missing for <class 'sqlglot.expressions.Sum'>. Line 4, Col: 1.",
            logger,
        )

    @patch("sqlglot.parser.logger")
    def test_comment_error_r(self, logger):
        parse_one(
            """SUM(-- test\r)""",
            error_level=ErrorLevel.WARN,
        )

        assert_logger_contains(
            "Required keyword: 'this' missing for <class 'sqlglot.expressions.Sum'>. Line 2, Col: 1.",
            logger,
        )

    @patch("sqlglot.parser.logger")
    def test_create_table_error(self, logger):
        parse_one(
            """CREATE TABLE PARTITION""",
            error_level=ErrorLevel.WARN,
        )

        assert_logger_contains(
            "Expected table name",
            logger,
        )

    def test_rename_table(self):
        self.assertEqual(
            parse_one("ALTER TABLE foo RENAME TO bar").sql(),
            "ALTER TABLE foo RENAME TO bar",
        )
