// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#[macro_use]
mod test_utils;

use sqlparser::ast::*;
use sqlparser::dialect::{BigQueryDialect, GenericDialect};
use test_utils::*;

#[test]
fn parse_literal_string() {
    let sql = r#"SELECT 'single', "double""#;
    let select = bigquery().verified_only_select(sql);
    assert_eq!(2, select.projection.len());
    assert_eq!(
        &Expr::Value(Value::SingleQuotedString("single".to_string())),
        expr_from_projection(&select.projection[0])
    );
    assert_eq!(
        &Expr::Value(Value::DoubleQuotedString("double".to_string())),
        expr_from_projection(&select.projection[1])
    );
}

#[test]
fn parse_table_identifiers() {
    fn test_table_ident(ident: &str, expected: Vec<Ident>) {
        let sql = format!("SELECT 1 FROM {}", ident);
        let select = bigquery().verified_only_select(&sql);
        assert_eq!(
            select.from,
            vec![TableWithJoins {
                relation: TableFactor::Table {
                    name: ObjectName(expected),
                    alias: None,
                    args: None,
                    with_hints: vec![],
                },
                joins: vec![]
            },]
        );
    }
    fn test_table_ident_err(ident: &str) {
        let sql = format!("SELECT 1 FROM {}", ident);
        assert!(bigquery().parse_sql_statements(&sql).is_err());
    }

    test_table_ident("da-sh-es", vec![Ident::new("da-sh-es")]);

    test_table_ident("`spa ce`", vec![Ident::with_quote('`', "spa ce")]);

    test_table_ident(
        "`!@#$%^&*()-=_+`",
        vec![Ident::with_quote('`', "!@#$%^&*()-=_+")],
    );

    test_table_ident(
        "_5abc.dataField",
        vec![Ident::new("_5abc"), Ident::new("dataField")],
    );
    test_table_ident(
        "`5abc`.dataField",
        vec![Ident::with_quote('`', "5abc"), Ident::new("dataField")],
    );

    test_table_ident_err("5abc.dataField");

    test_table_ident(
        "abc5.dataField",
        vec![Ident::new("abc5"), Ident::new("dataField")],
    );

    test_table_ident_err("abc5!.dataField");

    test_table_ident(
        "`GROUP`.dataField",
        vec![Ident::with_quote('`', "GROUP"), Ident::new("dataField")],
    );

    // TODO: this should be error
    // test_table_ident_err("GROUP.dataField");

    test_table_ident("abc5.GROUP", vec![Ident::new("abc5"), Ident::new("GROUP")]);
}

#[test]
fn parse_join_constraint_unnest_alias() {
    assert_eq!(
        only(
            bigquery()
                .verified_only_select("SELECT * FROM t1 JOIN UNNEST(t1.a) AS f ON c1 = c2")
                .from
        )
        .joins,
        vec![Join {
            relation: TableFactor::UNNEST {
                alias: table_alias("f"),
                array_expr: Box::new(Expr::CompoundIdentifier(vec![
                    Ident::new("t1"),
                    Ident::new("a")
                ])),
                with_offset: false,
                with_offset_alias: None
            },
            join_operator: JoinOperator::Inner(JoinConstraint::On(Expr::BinaryOp {
                left: Box::new(Expr::Identifier("c1".into())),
                op: BinaryOperator::Eq,
                right: Box::new(Expr::Identifier("c2".into())),
            })),
        }]
    );
}

#[test]
fn parse_trailing_comma() {
    for (sql, canonical) in [
        ("SELECT a,", "SELECT a"),
        ("SELECT a, b,", "SELECT a, b"),
        ("SELECT a, b AS c,", "SELECT a, b AS c"),
        ("SELECT a, b AS c, FROM t", "SELECT a, b AS c FROM t"),
        ("SELECT a, b, FROM t", "SELECT a, b FROM t"),
        ("SELECT a, b, LIMIT 1", "SELECT a, b LIMIT 1"),
        ("SELECT a, (SELECT 1, )", "SELECT a, (SELECT 1)"),
    ] {
        bigquery().one_statement_parses_to(sql, canonical);
    }
}

#[test]
fn parse_cast_type() {
    let sql = r#"SELECT SAFE_CAST(1 AS INT64)"#;
    bigquery().verified_only_select(sql);
}

#[test]
fn parse_like() {
    fn chk(negated: bool) {
        let sql = &format!(
            "SELECT * FROM customers WHERE name {}LIKE '%a'",
            if negated { "NOT " } else { "" }
        );
        let select = bigquery().verified_only_select(sql);
        assert_eq!(
            Expr::Like {
                expr: Box::new(Expr::Identifier(Ident::new("name"))),
                negated,
                pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
                escape_char: None,
            },
            select.selection.unwrap()
        );

        // Test with escape char
        let sql = &format!(
            "SELECT * FROM customers WHERE name {}LIKE '%a' ESCAPE '\\'",
            if negated { "NOT " } else { "" }
        );
        let select = bigquery().verified_only_select(sql);
        assert_eq!(
            Expr::Like {
                expr: Box::new(Expr::Identifier(Ident::new("name"))),
                negated,
                pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
                escape_char: Some('\\'),
            },
            select.selection.unwrap()
        );

        // This statement tests that LIKE and NOT LIKE have the same precedence.
        // This was previously mishandled (#81).
        let sql = &format!(
            "SELECT * FROM customers WHERE name {}LIKE '%a' IS NULL",
            if negated { "NOT " } else { "" }
        );
        let select = bigquery().verified_only_select(sql);
        assert_eq!(
            Expr::IsNull(Box::new(Expr::Like {
                expr: Box::new(Expr::Identifier(Ident::new("name"))),
                negated,
                pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
                escape_char: None,
            })),
            select.selection.unwrap()
        );
    }
    chk(false);
    chk(true);
}

#[test]
fn parse_similar_to() {
    fn chk(negated: bool) {
        let sql = &format!(
            "SELECT * FROM customers WHERE name {}SIMILAR TO '%a'",
            if negated { "NOT " } else { "" }
        );
        let select = bigquery().verified_only_select(sql);
        assert_eq!(
            Expr::SimilarTo {
                expr: Box::new(Expr::Identifier(Ident::new("name"))),
                negated,
                pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
                escape_char: None,
            },
            select.selection.unwrap()
        );

        // Test with escape char
        let sql = &format!(
            "SELECT * FROM customers WHERE name {}SIMILAR TO '%a' ESCAPE '\\'",
            if negated { "NOT " } else { "" }
        );
        let select = bigquery().verified_only_select(sql);
        assert_eq!(
            Expr::SimilarTo {
                expr: Box::new(Expr::Identifier(Ident::new("name"))),
                negated,
                pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
                escape_char: Some('\\'),
            },
            select.selection.unwrap()
        );

        // This statement tests that SIMILAR TO and NOT SIMILAR TO have the same precedence.
        let sql = &format!(
            "SELECT * FROM customers WHERE name {}SIMILAR TO '%a' ESCAPE '\\' IS NULL",
            if negated { "NOT " } else { "" }
        );
        let select = bigquery().verified_only_select(sql);
        assert_eq!(
            Expr::IsNull(Box::new(Expr::SimilarTo {
                expr: Box::new(Expr::Identifier(Ident::new("name"))),
                negated,
                pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
                escape_char: Some('\\'),
            })),
            select.selection.unwrap()
        );
    }
    chk(false);
    chk(true);
}

#[test]
fn parse_array_agg_func() {
    for sql in [
        "SELECT ARRAY_AGG(x ORDER BY x) AS a FROM T",
        "SELECT ARRAY_AGG(x ORDER BY x LIMIT 2) FROM tbl",
        "SELECT ARRAY_AGG(DISTINCT x ORDER BY x LIMIT 2) FROM tbl",
    ] {
        bigquery().verified_stmt(sql);
    }
}

#[test]
fn test_select_wildcard_with_except() {
    let select = bigquery_and_generic().verified_only_select("SELECT * EXCEPT (col_a) FROM data");
    let expected = SelectItem::Wildcard(WildcardAdditionalOptions {
        opt_except: Some(ExceptSelectItem {
            first_element: Ident::new("col_a"),
            additional_elements: vec![],
        }),
        ..Default::default()
    });
    assert_eq!(expected, select.projection[0]);

    let select = bigquery_and_generic()
        .verified_only_select("SELECT * EXCEPT (department_id, employee_id) FROM employee_table");
    let expected = SelectItem::Wildcard(WildcardAdditionalOptions {
        opt_except: Some(ExceptSelectItem {
            first_element: Ident::new("department_id"),
            additional_elements: vec![Ident::new("employee_id")],
        }),
        ..Default::default()
    });
    assert_eq!(expected, select.projection[0]);

    assert_eq!(
        bigquery_and_generic()
            .parse_sql_statements("SELECT * EXCEPT () FROM employee_table")
            .unwrap_err()
            .to_string(),
        "sql parser error: Expected identifier, found: )"
    );
}

fn bigquery() -> TestedDialects {
    TestedDialects {
        dialects: vec![Box::new(BigQueryDialect {})],
    }
}

fn bigquery_and_generic() -> TestedDialects {
    TestedDialects {
        dialects: vec![Box::new(BigQueryDialect {}), Box::new(GenericDialect {})],
    }
}

#[test]
fn parse_map_access_offset() {
    let sql = "SELECT d[offset(0)]";
    let _select = bigquery().verified_only_select(sql);
    #[cfg(not(feature = "bigdecimal"))]
    assert_eq!(
        _select.projection[0],
        SelectItem::UnnamedExpr(Expr::MapAccess {
            column: Box::new(Expr::Identifier(Ident {
                value: "d".to_string(),
                quote_style: None,
            })),
            keys: vec![Expr::Function(Function {
                name: ObjectName(vec!["offset".into()]),
                args: vec![FunctionArg::Unnamed(FunctionArgExpr::Expr(Expr::Value(
                    Value::Number("0".into(), false)
                ))),],
                over: None,
                distinct: false,
                special: false,
            })],
        })
    );

    // test other operators
    for sql in [
        "SELECT d[SAFE_OFFSET(0)]",
        "SELECT d[ORDINAL(0)]",
        "SELECT d[SAFE_ORDINAL(0)]",
    ] {
        bigquery().verified_only_select(sql);
    }
}