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

/// Unary operators
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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, Eq, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum BinaryOperator {
    Plus,
    Minus,
    Multiply,
    Divide,
    Modulo,
    StringConcat,
    Gt,
    Lt,
    GtEq,
    LtEq,
    Spaceship,
    Eq,
    NotEq,
    And,
    Or,
    Like,
    NotLike,
    ILike,
    NotILike,
    BitwiseOr,
    BitwiseAnd,
    BitwiseXor,
    PGBitwiseXor,
    PGBitwiseShiftLeft,
    PGBitwiseShiftRight,
    PGRegexMatch,
    PGRegexIMatch,
    PGRegexNotMatch,
    PGRegexNotIMatch,
}

impl fmt::Display for BinaryOperator {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str(match self {
            BinaryOperator::Plus => "+",
            BinaryOperator::Minus => "-",
            BinaryOperator::Multiply => "*",
            BinaryOperator::Divide => "/",
            BinaryOperator::Modulo => "%",
            BinaryOperator::StringConcat => "||",
            BinaryOperator::Gt => ">",
            BinaryOperator::Lt => "<",
            BinaryOperator::GtEq => ">=",
            BinaryOperator::LtEq => "<=",
            BinaryOperator::Spaceship => "<=>",
            BinaryOperator::Eq => "=",
            BinaryOperator::NotEq => "<>",
            BinaryOperator::And => "AND",
            BinaryOperator::Or => "OR",
            BinaryOperator::Like => "LIKE",
            BinaryOperator::NotLike => "NOT LIKE",
            BinaryOperator::ILike => "ILIKE",
            BinaryOperator::NotILike => "NOT ILIKE",
            BinaryOperator::BitwiseOr => "|",
            BinaryOperator::BitwiseAnd => "&",
            BinaryOperator::BitwiseXor => "^",
            BinaryOperator::PGBitwiseXor => "#",
            BinaryOperator::PGBitwiseShiftLeft => "<<",
            BinaryOperator::PGBitwiseShiftRight => ">>",
            BinaryOperator::PGRegexMatch => "~",
            BinaryOperator::PGRegexIMatch => "~*",
            BinaryOperator::PGRegexNotMatch => "!~",
            BinaryOperator::PGRegexNotIMatch => "!~*",
        })
    }
}