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use byteorder::{ByteOrder, LittleEndian};

use crate::decode::Decode;
use crate::encode::{Encode, IsNull};
use crate::error::BoxDynError;
use crate::mssql::protocol::type_info::{DataType, TypeInfo};
use crate::mssql::{Mssql, MssqlTypeInfo, MssqlValueRef};
use crate::types::Type;

impl Type<Mssql> for i8 {
    fn type_info() -> MssqlTypeInfo {
        MssqlTypeInfo(TypeInfo::new(DataType::IntN, 1))
    }

    fn compatible(ty: &MssqlTypeInfo) -> bool {
        matches!(ty.0.ty, DataType::TinyInt | DataType::IntN) && ty.0.size == 1
    }
}

impl Encode<'_, Mssql> for i8 {
    fn encode_by_ref(&self, buf: &mut Vec<u8>) -> IsNull {
        buf.extend(&self.to_le_bytes());

        IsNull::No
    }
}

impl Decode<'_, Mssql> for i8 {
    fn decode(value: MssqlValueRef<'_>) -> Result<Self, BoxDynError> {
        Ok(value.as_bytes()?[0] as i8)
    }
}

impl Type<Mssql> for i16 {
    fn type_info() -> MssqlTypeInfo {
        MssqlTypeInfo(TypeInfo::new(DataType::IntN, 2))
    }

    fn compatible(ty: &MssqlTypeInfo) -> bool {
        matches!(ty.0.ty, DataType::SmallInt | DataType::IntN) && ty.0.size == 2
    }
}

impl Encode<'_, Mssql> for i16 {
    fn encode_by_ref(&self, buf: &mut Vec<u8>) -> IsNull {
        buf.extend(&self.to_le_bytes());

        IsNull::No
    }
}

impl Decode<'_, Mssql> for i16 {
    fn decode(value: MssqlValueRef<'_>) -> Result<Self, BoxDynError> {
        Ok(LittleEndian::read_i16(value.as_bytes()?))
    }
}

impl Type<Mssql> for i32 {
    fn type_info() -> MssqlTypeInfo {
        MssqlTypeInfo(TypeInfo::new(DataType::IntN, 4))
    }

    fn compatible(ty: &MssqlTypeInfo) -> bool {
        matches!(ty.0.ty, DataType::Int | DataType::IntN) && ty.0.size == 4
    }
}

impl Encode<'_, Mssql> for i32 {
    fn encode_by_ref(&self, buf: &mut Vec<u8>) -> IsNull {
        buf.extend(&self.to_le_bytes());

        IsNull::No
    }
}

impl Decode<'_, Mssql> for i32 {
    fn decode(value: MssqlValueRef<'_>) -> Result<Self, BoxDynError> {
        Ok(LittleEndian::read_i32(value.as_bytes()?))
    }
}

impl Type<Mssql> for i64 {
    fn type_info() -> MssqlTypeInfo {
        MssqlTypeInfo(TypeInfo::new(DataType::IntN, 8))
    }

    fn compatible(ty: &MssqlTypeInfo) -> bool {
        matches!(ty.0.ty, DataType::BigInt | DataType::IntN) && ty.0.size == 8
    }
}

impl Encode<'_, Mssql> for i64 {
    fn encode_by_ref(&self, buf: &mut Vec<u8>) -> IsNull {
        buf.extend(&self.to_le_bytes());

        IsNull::No
    }
}

impl Decode<'_, Mssql> for i64 {
    fn decode(value: MssqlValueRef<'_>) -> Result<Self, BoxDynError> {
        Ok(LittleEndian::read_i64(value.as_bytes()?))
    }
}