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// 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.

use core::fmt;

#[cfg(not(feature = "std"))]
use alloc::{string::String, vec::Vec};

#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};

#[cfg(feature = "visitor")]
use sqlparser_derive::{Visit, VisitMut};

use super::display_separated;

/// Unary operators
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
pub enum UnaryOperator {
    Plus,
    Minus,
    Not,
    /// Bitwise Not, e.g. `~9` (PostgreSQL-specific)
    PGBitwiseNot,
    /// Square root, e.g. `|/9` (PostgreSQL-specific)
    PGSquareRoot,
    /// Cube root, e.g. `||/27` (PostgreSQL-specific)
    PGCubeRoot,
    /// Factorial, e.g. `9!` (PostgreSQL-specific)
    PGPostfixFactorial,
    /// Factorial, e.g. `!!9` (PostgreSQL-specific)
    PGPrefixFactorial,
    /// Absolute value, e.g. `@ -9` (PostgreSQL-specific)
    PGAbs,
}

impl fmt::Display for UnaryOperator {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str(match self {
            UnaryOperator::Plus => "+",
            UnaryOperator::Minus => "-",
            UnaryOperator::Not => "NOT",
            UnaryOperator::PGBitwiseNot => "~",
            UnaryOperator::PGSquareRoot => "|/",
            UnaryOperator::PGCubeRoot => "||/",
            UnaryOperator::PGPostfixFactorial => "!",
            UnaryOperator::PGPrefixFactorial => "!!",
            UnaryOperator::PGAbs => "@",
        })
    }
}

/// Binary operators
#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
pub enum BinaryOperator {
    Plus,
    Minus,
    Multiply,
    Divide,
    Modulo,
    StringConcat,
    Gt,
    Lt,
    GtEq,
    LtEq,
    Spaceship,
    Eq,
    NotEq,
    And,
    Or,
    Xor,
    BitwiseOr,
    BitwiseAnd,
    BitwiseXor,
    PGBitwiseXor,
    PGBitwiseShiftLeft,
    PGBitwiseShiftRight,
    PGExp,
    PGRegexMatch,
    PGRegexIMatch,
    PGRegexNotMatch,
    PGRegexNotIMatch,
    /// PostgreSQL-specific custom operator.
    ///
    /// See [CREATE OPERATOR](https://www.postgresql.org/docs/current/sql-createoperator.html)
    /// for more information.
    PGCustomBinaryOperator(Vec<String>),
}

impl fmt::Display for BinaryOperator {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            BinaryOperator::Plus => f.write_str("+"),
            BinaryOperator::Minus => f.write_str("-"),
            BinaryOperator::Multiply => f.write_str("*"),
            BinaryOperator::Divide => f.write_str("/"),
            BinaryOperator::Modulo => f.write_str("%"),
            BinaryOperator::StringConcat => f.write_str("||"),
            BinaryOperator::Gt => f.write_str(">"),
            BinaryOperator::Lt => f.write_str("<"),
            BinaryOperator::GtEq => f.write_str(">="),
            BinaryOperator::LtEq => f.write_str("<="),
            BinaryOperator::Spaceship => f.write_str("<=>"),
            BinaryOperator::Eq => f.write_str("="),
            BinaryOperator::NotEq => f.write_str("<>"),
            BinaryOperator::And => f.write_str("AND"),
            BinaryOperator::Or => f.write_str("OR"),
            BinaryOperator::Xor => f.write_str("XOR"),
            BinaryOperator::BitwiseOr => f.write_str("|"),
            BinaryOperator::BitwiseAnd => f.write_str("&"),
            BinaryOperator::BitwiseXor => f.write_str("^"),
            BinaryOperator::PGBitwiseXor => f.write_str("#"),
            BinaryOperator::PGBitwiseShiftLeft => f.write_str("<<"),
            BinaryOperator::PGBitwiseShiftRight => f.write_str(">>"),
            BinaryOperator::PGExp => f.write_str("^"),
            BinaryOperator::PGRegexMatch => f.write_str("~"),
            BinaryOperator::PGRegexIMatch => f.write_str("~*"),
            BinaryOperator::PGRegexNotMatch => f.write_str("!~"),
            BinaryOperator::PGRegexNotIMatch => f.write_str("!~*"),
            BinaryOperator::PGCustomBinaryOperator(idents) => {
                write!(f, "OPERATOR({})", display_separated(idents, "."))
            }
        }
    }
}