// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

//! Built-in functions module contains all the built-in functions definitions.

use crate::Volatility;
use datafusion_common::{DataFusionError, Result};
use std::fmt;
use std::str::FromStr;

/// Enum of all built-in scalar functions
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum BuiltinScalarFunction {
    // math functions
    /// abs
    Abs,
    /// acos
    Acos,
    /// asin
    Asin,
    /// atan
    Atan,
    /// atan2
    Atan2,
    /// ceil
    Ceil,
    /// coalesce
    Coalesce,
    /// cos
    Cos,
    /// Digest
    Digest,
    /// exp
    Exp,
    /// floor
    Floor,
    /// ln, Natural logarithm
    Ln,
    /// log, same as log10
    Log,
    /// log10
    Log10,
    /// log2
    Log2,
    /// power
    Power,
    /// round
    Round,
    /// signum
    Signum,
    /// sin
    Sin,
    /// sqrt
    Sqrt,
    /// tan
    Tan,
    /// trunc
    Trunc,

    // string functions
    /// construct an array from columns
    MakeArray,
    /// ascii
    Ascii,
    /// bit_length
    BitLength,
    /// btrim
    Btrim,
    /// character_length
    CharacterLength,
    /// chr
    Chr,
    /// concat
    Concat,
    /// concat_ws
    ConcatWithSeparator,
    /// date_part
    DatePart,
    /// date_trunc
    DateTrunc,
    /// date_bin
    DateBin,
    /// initcap
    InitCap,
    /// left
    Left,
    /// lpad
    Lpad,
    /// lower
    Lower,
    /// ltrim
    Ltrim,
    /// md5
    MD5,
    /// nullif
    NullIf,
    /// octet_length
    OctetLength,
    /// random
    Random,
    /// regexp_replace
    RegexpReplace,
    /// repeat
    Repeat,
    /// replace
    Replace,
    /// reverse
    Reverse,
    /// right
    Right,
    /// rpad
    Rpad,
    /// rtrim
    Rtrim,
    /// sha224
    SHA224,
    /// sha256
    SHA256,
    /// sha384
    SHA384,
    /// Sha512
    SHA512,
    /// split_part
    SplitPart,
    /// starts_with
    StartsWith,
    /// strpos
    Strpos,
    /// substr
    Substr,
    /// to_hex
    ToHex,
    /// to_timestamp
    ToTimestamp,
    /// to_timestamp_millis
    ToTimestampMillis,
    /// to_timestamp_micros
    ToTimestampMicros,
    /// to_timestamp_seconds
    ToTimestampSeconds,
    /// from_unixtime
    FromUnixtime,
    ///now
    Now,
    /// translate
    Translate,
    /// trim
    Trim,
    /// upper
    Upper,
    /// regexp_match
    RegexpMatch,
    /// struct
    Struct,
    /// arrow_typeof
    ArrowTypeof,
}

impl BuiltinScalarFunction {
    /// an allowlist of functions to take zero arguments, so that they will get special treatment
    /// while executing.
    pub fn supports_zero_argument(&self) -> bool {
        matches!(
            self,
            BuiltinScalarFunction::Random | BuiltinScalarFunction::Now
        )
    }
    /// Returns the [Volatility] of the builtin function.
    pub fn volatility(&self) -> Volatility {
        match self {
            // Immutable scalar builtins
            BuiltinScalarFunction::Abs => Volatility::Immutable,
            BuiltinScalarFunction::Acos => Volatility::Immutable,
            BuiltinScalarFunction::Asin => Volatility::Immutable,
            BuiltinScalarFunction::Atan => Volatility::Immutable,
            BuiltinScalarFunction::Atan2 => Volatility::Immutable,
            BuiltinScalarFunction::Ceil => Volatility::Immutable,
            BuiltinScalarFunction::Coalesce => Volatility::Immutable,
            BuiltinScalarFunction::Cos => Volatility::Immutable,
            BuiltinScalarFunction::Exp => Volatility::Immutable,
            BuiltinScalarFunction::Floor => Volatility::Immutable,
            BuiltinScalarFunction::Ln => Volatility::Immutable,
            BuiltinScalarFunction::Log => Volatility::Immutable,
            BuiltinScalarFunction::Log10 => Volatility::Immutable,
            BuiltinScalarFunction::Log2 => Volatility::Immutable,
            BuiltinScalarFunction::Power => Volatility::Immutable,
            BuiltinScalarFunction::Round => Volatility::Immutable,
            BuiltinScalarFunction::Signum => Volatility::Immutable,
            BuiltinScalarFunction::Sin => Volatility::Immutable,
            BuiltinScalarFunction::Sqrt => Volatility::Immutable,
            BuiltinScalarFunction::Tan => Volatility::Immutable,
            BuiltinScalarFunction::Trunc => Volatility::Immutable,
            BuiltinScalarFunction::MakeArray => Volatility::Immutable,
            BuiltinScalarFunction::Ascii => Volatility::Immutable,
            BuiltinScalarFunction::BitLength => Volatility::Immutable,
            BuiltinScalarFunction::Btrim => Volatility::Immutable,
            BuiltinScalarFunction::CharacterLength => Volatility::Immutable,
            BuiltinScalarFunction::Chr => Volatility::Immutable,
            BuiltinScalarFunction::Concat => Volatility::Immutable,
            BuiltinScalarFunction::ConcatWithSeparator => Volatility::Immutable,
            BuiltinScalarFunction::DatePart => Volatility::Immutable,
            BuiltinScalarFunction::DateTrunc => Volatility::Immutable,
            BuiltinScalarFunction::DateBin => Volatility::Immutable,
            BuiltinScalarFunction::InitCap => Volatility::Immutable,
            BuiltinScalarFunction::Left => Volatility::Immutable,
            BuiltinScalarFunction::Lpad => Volatility::Immutable,
            BuiltinScalarFunction::Lower => Volatility::Immutable,
            BuiltinScalarFunction::Ltrim => Volatility::Immutable,
            BuiltinScalarFunction::MD5 => Volatility::Immutable,
            BuiltinScalarFunction::NullIf => Volatility::Immutable,
            BuiltinScalarFunction::OctetLength => Volatility::Immutable,
            BuiltinScalarFunction::RegexpReplace => Volatility::Immutable,
            BuiltinScalarFunction::Repeat => Volatility::Immutable,
            BuiltinScalarFunction::Replace => Volatility::Immutable,
            BuiltinScalarFunction::Reverse => Volatility::Immutable,
            BuiltinScalarFunction::Right => Volatility::Immutable,
            BuiltinScalarFunction::Rpad => Volatility::Immutable,
            BuiltinScalarFunction::Rtrim => Volatility::Immutable,
            BuiltinScalarFunction::SHA224 => Volatility::Immutable,
            BuiltinScalarFunction::SHA256 => Volatility::Immutable,
            BuiltinScalarFunction::SHA384 => Volatility::Immutable,
            BuiltinScalarFunction::SHA512 => Volatility::Immutable,
            BuiltinScalarFunction::Digest => Volatility::Immutable,
            BuiltinScalarFunction::SplitPart => Volatility::Immutable,
            BuiltinScalarFunction::StartsWith => Volatility::Immutable,
            BuiltinScalarFunction::Strpos => Volatility::Immutable,
            BuiltinScalarFunction::Substr => Volatility::Immutable,
            BuiltinScalarFunction::ToHex => Volatility::Immutable,
            BuiltinScalarFunction::ToTimestamp => Volatility::Immutable,
            BuiltinScalarFunction::ToTimestampMillis => Volatility::Immutable,
            BuiltinScalarFunction::ToTimestampMicros => Volatility::Immutable,
            BuiltinScalarFunction::ToTimestampSeconds => Volatility::Immutable,
            BuiltinScalarFunction::Translate => Volatility::Immutable,
            BuiltinScalarFunction::Trim => Volatility::Immutable,
            BuiltinScalarFunction::Upper => Volatility::Immutable,
            BuiltinScalarFunction::RegexpMatch => Volatility::Immutable,
            BuiltinScalarFunction::Struct => Volatility::Immutable,
            BuiltinScalarFunction::FromUnixtime => Volatility::Immutable,
            BuiltinScalarFunction::ArrowTypeof => Volatility::Immutable,

            // Stable builtin functions
            BuiltinScalarFunction::Now => Volatility::Stable,

            // Volatile builtin functions
            BuiltinScalarFunction::Random => Volatility::Volatile,
        }
    }
}

impl fmt::Display for BuiltinScalarFunction {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        // lowercase of the debug.
        write!(f, "{}", format!("{:?}", self).to_lowercase())
    }
}

impl FromStr for BuiltinScalarFunction {
    type Err = DataFusionError;
    fn from_str(name: &str) -> Result<BuiltinScalarFunction> {
        Ok(match name {
            // math functions
            "abs" => BuiltinScalarFunction::Abs,
            "acos" => BuiltinScalarFunction::Acos,
            "asin" => BuiltinScalarFunction::Asin,
            "atan" => BuiltinScalarFunction::Atan,
            "atan2" => BuiltinScalarFunction::Atan2,
            "ceil" => BuiltinScalarFunction::Ceil,
            "cos" => BuiltinScalarFunction::Cos,
            "exp" => BuiltinScalarFunction::Exp,
            "floor" => BuiltinScalarFunction::Floor,
            "ln" => BuiltinScalarFunction::Ln,
            "log" => BuiltinScalarFunction::Log,
            "log10" => BuiltinScalarFunction::Log10,
            "log2" => BuiltinScalarFunction::Log2,
            "power" | "pow" => BuiltinScalarFunction::Power,
            "round" => BuiltinScalarFunction::Round,
            "signum" => BuiltinScalarFunction::Signum,
            "sin" => BuiltinScalarFunction::Sin,
            "sqrt" => BuiltinScalarFunction::Sqrt,
            "tan" => BuiltinScalarFunction::Tan,
            "trunc" => BuiltinScalarFunction::Trunc,

            // conditional functions
            "coalesce" => BuiltinScalarFunction::Coalesce,

            // array functions
            "make_array" => BuiltinScalarFunction::MakeArray,

            // string functions
            "ascii" => BuiltinScalarFunction::Ascii,
            "bit_length" => BuiltinScalarFunction::BitLength,
            "btrim" => BuiltinScalarFunction::Btrim,
            "char_length" => BuiltinScalarFunction::CharacterLength,
            "character_length" => BuiltinScalarFunction::CharacterLength,
            "concat" => BuiltinScalarFunction::Concat,
            "concat_ws" => BuiltinScalarFunction::ConcatWithSeparator,
            "chr" => BuiltinScalarFunction::Chr,
            "date_part" | "datepart" => BuiltinScalarFunction::DatePart,
            "date_trunc" | "datetrunc" => BuiltinScalarFunction::DateTrunc,
            "date_bin" => BuiltinScalarFunction::DateBin,
            "initcap" => BuiltinScalarFunction::InitCap,
            "left" => BuiltinScalarFunction::Left,
            "length" => BuiltinScalarFunction::CharacterLength,
            "lower" => BuiltinScalarFunction::Lower,
            "lpad" => BuiltinScalarFunction::Lpad,
            "ltrim" => BuiltinScalarFunction::Ltrim,
            "md5" => BuiltinScalarFunction::MD5,
            "nullif" => BuiltinScalarFunction::NullIf,
            "octet_length" => BuiltinScalarFunction::OctetLength,
            "random" => BuiltinScalarFunction::Random,
            "regexp_replace" => BuiltinScalarFunction::RegexpReplace,
            "repeat" => BuiltinScalarFunction::Repeat,
            "replace" => BuiltinScalarFunction::Replace,
            "reverse" => BuiltinScalarFunction::Reverse,
            "right" => BuiltinScalarFunction::Right,
            "rpad" => BuiltinScalarFunction::Rpad,
            "rtrim" => BuiltinScalarFunction::Rtrim,
            "sha224" => BuiltinScalarFunction::SHA224,
            "sha256" => BuiltinScalarFunction::SHA256,
            "sha384" => BuiltinScalarFunction::SHA384,
            "sha512" => BuiltinScalarFunction::SHA512,
            "digest" => BuiltinScalarFunction::Digest,
            "split_part" => BuiltinScalarFunction::SplitPart,
            "starts_with" => BuiltinScalarFunction::StartsWith,
            "strpos" => BuiltinScalarFunction::Strpos,
            "substr" => BuiltinScalarFunction::Substr,
            "to_hex" => BuiltinScalarFunction::ToHex,
            "to_timestamp" => BuiltinScalarFunction::ToTimestamp,
            "to_timestamp_millis" => BuiltinScalarFunction::ToTimestampMillis,
            "to_timestamp_micros" => BuiltinScalarFunction::ToTimestampMicros,
            "to_timestamp_seconds" => BuiltinScalarFunction::ToTimestampSeconds,
            "now" => BuiltinScalarFunction::Now,
            "translate" => BuiltinScalarFunction::Translate,
            "trim" => BuiltinScalarFunction::Trim,
            "upper" => BuiltinScalarFunction::Upper,
            "regexp_match" => BuiltinScalarFunction::RegexpMatch,
            "struct" => BuiltinScalarFunction::Struct,
            "from_unixtime" => BuiltinScalarFunction::FromUnixtime,
            "arrow_typeof" => BuiltinScalarFunction::ArrowTypeof,
            _ => {
                return Err(DataFusionError::Plan(format!(
                    "There is no built-in function named {}",
                    name
                )))
            }
        })
    }
}