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use rand;
use frame::*;
use query::QueryFlags;
use types::*;
use consistency::Consistency;
use query::QueryValues;

/// `BodyResReady`
#[derive(Debug, Clone)]
pub struct BodyReqBatch {
    pub batch_type: BatchType,
    pub queries: Vec<BatchQuery>,
    pub consistency: Consistency,
    /// **IMPORTANT NOTE:** with names flag does not work and should not be used.
    /// https://github.com/apache/cassandra/blob/trunk/doc/native_protocol_v4.spec#L413
    pub query_flags: Vec<QueryFlags>,
    pub serial_consistency: Option<Consistency>,
    pub timestamp: Option<i64>,
}

impl IntoBytes for BodyReqBatch {
    fn into_cbytes(&self) -> Vec<u8> {
        let mut bytes = vec![];

        bytes.push(self.batch_type.as_byte());

        bytes.extend_from_slice(to_short(self.queries.len() as i16).as_slice());

        bytes = self.queries.iter().fold(bytes, |mut _bytes, q| {
            _bytes.extend_from_slice(q.into_cbytes().as_slice());
            _bytes
        });

        bytes.extend_from_slice(self.consistency.into_cbytes().as_slice());

        let flag_byte = self.query_flags.iter()
                            .fold(0, |mut _bytes, f| _bytes | f.as_byte());
        bytes.push(flag_byte);

        if let Some(ref serial_consistency) = self.serial_consistency {
            bytes.extend_from_slice(serial_consistency.into_cbytes().as_slice());
        }

        if let Some(ref timestamp) = self.timestamp {
            //bytes.extend_from_slice(to_bigint(timestamp.clone()).as_slice());
            bytes.extend_from_slice(to_bigint(*timestamp).as_slice());
        }

        bytes
    }
}

/// Batch type
#[derive(Debug, Clone, PartialEq)]
pub enum BatchType {
    /// The batch will be "logged". This is equivalent to a
    /// normal CQL3 batch statement.
    Logged,
    /// The batch will be "unlogged".
    Unlogged,
    /// The batch will be a "counter" batch (and non-counter
    /// statements will be rejected).
    Counter,
}

impl FromSingleByte for BatchType {
    fn from_byte(byte: u8) -> BatchType {
        match byte {
            0 => BatchType::Logged,
            1 => BatchType::Unlogged,
            2 => BatchType::Counter,
            _ => unreachable!(),
        }
    }
}

impl AsByte for BatchType {
    fn as_byte(&self) -> u8 {
        match *self {
            BatchType::Logged => 0,
            BatchType::Unlogged => 1,
            BatchType::Counter => 2,
        }
    }
}

/// The structure that represents a query to be batched.
#[derive(Debug, Clone)]
pub struct BatchQuery {
    /// It indicates if a query was prepared.
    pub is_prepared: bool,
    /// It contains either id of prepared query of a query itself.
    pub subject: BatchQuerySubj,
    /// It is the optional name of the following <value_i>. It must be present
    /// if and only if the 0x40 flag is provided for the batch.
    /// **Important note:** this feature does not work and should not be
    /// used. It is specified in a way that makes it impossible for the server
    /// to implement. This will be fixed in a future version of the native
    /// protocol. See https://issues.apache.org/jira/browse/CASSANDRA-10246 for
    /// more details
    pub values: QueryValues,
}

/// It contains either an id of prepared query or CQL string.
#[derive(Debug, Clone)]
pub enum BatchQuerySubj {
    PreparedId(CBytesShort),
    QueryString(CStringLong),
}

impl IntoBytes for BatchQuery {
    fn into_cbytes(&self) -> Vec<u8> {
        let mut bytes = vec![];

        // kind
        if self.is_prepared {
            bytes.push(1);
        } else {
            bytes.push(0);
        }

        match self.subject {
            BatchQuerySubj::PreparedId(ref s) => {
                bytes.extend_from_slice(s.into_cbytes().as_slice());
            }
            BatchQuerySubj::QueryString(ref s) => {
                bytes.extend_from_slice(s.into_cbytes().as_slice());
            }
        }

        bytes.extend_from_slice(to_short(self.values.len() as i16).as_slice());

        bytes.extend_from_slice(self.values.into_cbytes().as_slice());

        bytes
    }
}

impl Frame {
    /// **Note:** This function should be used internally for building query request frames.
    pub fn new_req_batch(query: BodyReqBatch, flags: Vec<Flag>) -> Frame {
        let version = Version::Request;
        let stream = rand::random::<u16>();
        let opcode = Opcode::Batch;

        Frame { version: version,
                flags: flags,
                stream: stream,
                opcode: opcode,
                body: query.into_cbytes(),
                // for request frames it's always None
                tracing_id: None,
                warnings: vec![], }
    }
}