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use super::super::IntoBytes;
use super::*;

/// Types of Cassandra value: normal value (bits), null value and not-set value
#[derive(Debug, Clone)]
pub enum ValueType {
    Normal(i32),
    Null,
    NotSet
}

impl IntoBytes for ValueType {
    fn into_cbytes(&self) -> Vec<u8> {
        return match *self {
            ValueType::Normal(n) => to_int(n as i64),
            ValueType::Null => i_to_n_bytes(-1, INT_LEN),
            ValueType::NotSet => i_to_n_bytes(-2, INT_LEN)
        };
    }
}

/// Cassandra value which could be an array of bytes, null and non-set values.
#[derive(Debug, Clone)]
pub struct Value {
    pub body: Vec<u8>,
    pub value_type: ValueType
}

impl Value {
    /// The factory method which creates a normal type value basing on provided bytes.
    pub fn new_normal(body: Vec<u8>) -> Value {
        let l = body.len() as i32;
        return Value {
            body: body,
            value_type: ValueType::Normal(l)
        };
    }

    /// The factory method which creates null Cassandra value.
    pub fn new_null() -> Value {
        return Value {
            body: vec![],
            value_type: ValueType::Null
        };
    }

    /// The factory method which creates non-set Cassandra value.
    pub fn new_not_set() -> Value {
        return Value {
            body: vec![],
            value_type: ValueType::NotSet
        };
    }
}

impl IntoBytes for Value {
    fn into_cbytes(&self) -> Vec<u8> {
        let mut v: Vec<u8> = vec![];
        v.extend_from_slice(self.value_type.into_cbytes().as_slice());
        v.extend_from_slice(self.body.as_slice());
        return v;
    }
}