use crate::{InputValueError, InputValueResult, Number, Scalar, ScalarType, Value};

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for i8 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_i64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n < Self::MIN as i64 || n > Self::MAX as i64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        Self::MIN,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_i64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as i64))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for i16 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_i64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n < Self::MIN as i64 || n > Self::MAX as i64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        Self::MIN,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_i64()  )
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as i64))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for i32 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_i64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n < Self::MIN as i64 || n > Self::MAX as i64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        Self::MIN,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_i64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as i64))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for i64 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_i64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_i64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for u8 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_u64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n > Self::MAX as u64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        0,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_u64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as u64))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for u16 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_u64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n > Self::MAX as u64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        0,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_u64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as u64))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for u32 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_u64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n > Self::MAX as u64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        0,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_u64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as u64))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for u64 {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_u64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_u64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for usize {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_u64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n > Self::MAX as u64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        0,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_u64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as u64))
    }
}

/// The `Int` scalar type represents non-fractional whole numeric values.
#[Scalar(internal, name = "Int")]
impl ScalarType for isize {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::Number(n) => {
                let n = n
                    .as_i64()
                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
                if n < Self::MIN as i64 || n > Self::MAX as i64 {
                    return Err(InputValueError::from(format!(
                        "Only integers from {} to {} are accepted.",
                        Self::MIN,
                        Self::MAX
                    )));
                }
                Ok(n as Self)
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn is_valid(value: &Value) -> bool {
        matches!(value, Value::Number(n) if n.is_i64())
    }

    fn to_value(&self) -> Value {
        Value::Number(Number::from(*self as i64))
    }
}