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use cassandra::consistency::Consistency;
use cassandra::policy::retry::RetryPolicy;
use cassandra::statement::Statement;
use cassandra::util::Protected;
use cassandra::error::*;

use cassandra_sys::CassBatch as _Batch;
use cassandra_sys::CassBatchType_;
use cassandra_sys::CassConsistency;
use cassandra_sys::CassCustomPayload as _CassCustomPayload;
use cassandra_sys::cass_batch_add_statement;
use cassandra_sys::cass_batch_free;
use cassandra_sys::cass_batch_new;
use cassandra_sys::cass_batch_set_consistency;
use cassandra_sys::cass_batch_set_custom_payload;
use cassandra_sys::cass_batch_set_retry_policy;
use cassandra_sys::cass_batch_set_serial_consistency;
use cassandra_sys::cass_batch_set_timestamp;
use cassandra_sys::cass_custom_payload_free;
use cassandra_sys::cass_custom_payload_new;
use cassandra_sys::cass_custom_payload_set;
use std::ffi::CString;
use std::ffi::NulError;


/// A group of statements that are executed as a single batch.
/// <b>Note:</b> Batches are not supported by the binary protocol version 1.
#[derive(Debug)]
pub struct Batch(*mut _Batch);

// The underlying C type has no thread-local state, but does not support access
// from multiple threads: https://datastax.github.io/cpp-driver/topics/#thread-safety
unsafe impl Send for Batch {}

impl Protected<*mut _Batch> for Batch {
    fn inner(&self) -> *mut _Batch { self.0 }
    fn build(inner: *mut _Batch) -> Self { Batch(inner) }
}

/// Custom payloads not fully supported yet
#[derive(Debug)]
pub struct CustomPayload(*mut _CassCustomPayload);

impl Protected<*mut _CassCustomPayload> for CustomPayload {
    fn inner(&self) -> *mut _CassCustomPayload { self.0 }
    fn build(inner: *mut _CassCustomPayload) -> Self { CustomPayload(inner) }
}

impl Default for CustomPayload {
    /// creates a new custom payload
    fn default() -> Self { unsafe { CustomPayload(cass_custom_payload_new()) } }
}
impl CustomPayload {
    /// Sets an item to the custom payload.
    pub fn set(&self, name: String, value: &[u8]) -> Result<()> {
        unsafe {
            Ok(cass_custom_payload_set(self.0,
                                       CString::new(name)?.as_ptr(),
                                       value.as_ptr(),
                                       value.len()))
        }
    }
}

impl Drop for CustomPayload {
    fn drop(&mut self) { unsafe { cass_custom_payload_free(self.0) } }
}

impl Drop for Batch {
    /// Frees a batch instance. Batches can be immediately freed after being
    /// executed.
    fn drop(&mut self) { unsafe { cass_batch_free(self.0) } }
}

impl Batch {
    /// Creates a new batch statement with batch type.
    pub fn new(batch_type: BatchType) -> Batch { unsafe { Batch(cass_batch_new(batch_type.inner())) } }

    /// Sets the batch's consistency level
    pub fn set_consistency(&mut self, consistency: Consistency) -> Result<&mut Self> {
        unsafe {
            cass_batch_set_consistency(self.0, consistency.inner()).to_result(self)
        }
    }

    /// Sets the batch's serial consistency level.
    ///
    /// <b>Default:</b> Not set
    pub fn set_serial_consistency(&mut self, consistency: Consistency) -> Result<&mut Self> {
        unsafe {
            cass_batch_set_serial_consistency(self.0, consistency.inner()).to_result(self)
        }
    }

    /// Sets the batch's timestamp.
    pub fn set_timestamp(&mut self, timestamp: i64) -> Result<&Self> {
        unsafe {
            cass_batch_set_timestamp(self.0, timestamp).to_result(self)
        }
    }

    /// Sets the batch's retry policy.
    pub fn set_retry_policy(&mut self, retry_policy: RetryPolicy) -> Result<&mut Self> {
        unsafe {
            cass_batch_set_retry_policy(self.0, retry_policy.inner()).to_result(self)
        }
    }

    /// Sets the batch's custom payload.
    pub fn set_custom_payload(&mut self, custom_payload: CustomPayload) -> Result<&mut Self> {
        unsafe {
            cass_batch_set_custom_payload(self.0, custom_payload.0).to_result(self)
        }
    }

    /// Adds a statement to a batch.
    pub fn add_statement(&mut self, statement: &Statement) -> Result<&Self> {
        unsafe {
            cass_batch_add_statement(self.0, statement.inner()).to_result(self)
        }
    }
}

/// A type of batch.
#[derive(Debug, Eq, PartialEq, Copy, Clone, Hash)]
#[allow(missing_docs)] // Meanings are defined in CQL documentation.
#[allow(non_camel_case_types)] // Names are traditional.
pub enum BatchType {
    LOGGED,
    UNLOGGED,
    COUNTER,
}

enhance_nullary_enum!(BatchType, CassBatchType_, {
    (LOGGED, CASS_BATCH_TYPE_LOGGED, "LOGGED"),
    (UNLOGGED, CASS_BATCH_TYPE_UNLOGGED, "UNLOGGED"),
    (COUNTER, CASS_BATCH_TYPE_COUNTER, "COUNTER"),
});