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use std::io::Error as IoError;
use std::fmt::Debug;
use std::marker::PhantomData;

use log::trace;
use bytes::BytesMut;

use crate::core::Encoder;
use crate::core::Decoder;
use crate::core::Version;
use crate::derive::Encode;
use crate::derive::Decode;
use crate::derive::FluvioDefault;

use crate::api::Request;
use crate::record::FileRecordSet;
use crate::record::RecordSet;
use crate::store::FileWrite;
use crate::store::StoreValue;

use super::ProduceResponse;

pub type DefaultProduceRequest = ProduceRequest<RecordSet>;
pub type DefaultPartitionRequest = PartitionProduceData<RecordSet>;
pub type DefaultTopicRequest = TopicProduceData<RecordSet>;
pub type FileProduceRequest = ProduceRequest<FileRecordSet>;
pub type FileTopicRequest = TopicProduceData<FileRecordSet>;
pub type FilePartitionRequest = PartitionProduceData<FileRecordSet>;

#[derive(Encode, Decode, FluvioDefault, Debug)]
pub struct ProduceRequest<R>
where
    R: Encoder + Decoder + Default + Debug,
{
    /// The transactional ID, or null if the producer is not transactional.
    #[fluvio(min_version = 3)]
    pub transactional_id: Option<String>,

    /// The number of acknowledgments the producer requires the leader to have received before
    /// considering a request complete. Allowed values: 0 for no acknowledgments, 1 for only the
    /// leader and -1 for the full ISR.
    pub acks: i16,

    /// The timeout to await a response in miliseconds.
    pub timeout_ms: i32,

    /// Each topic to produce to.
    pub topics: Vec<TopicProduceData<R>>,
    pub data: PhantomData<R>,
}

impl<R> Request for ProduceRequest<R>
where
    R: Debug + Decoder + Encoder,
{
    const API_KEY: u16 = 0;

    const MIN_API_VERSION: i16 = 0;
    const MAX_API_VERSION: i16 = 7;
    const DEFAULT_API_VERSION: i16 = 7;

    type Response = ProduceResponse;
}

impl FileWrite for FileProduceRequest {
    fn file_encode(
        &self,
        src: &mut BytesMut,
        data: &mut Vec<StoreValue>,
        version: Version,
    ) -> Result<(), IoError> {
        trace!("file encoding produce request");
        self.transactional_id.encode(src, version)?;
        self.acks.encode(src, version)?;
        self.timeout_ms.encode(src, version)?;
        self.topics.file_encode(src, data, version)?;
        Ok(())
    }
}

impl FileWrite for FileTopicRequest {
    fn file_encode(
        &self,
        src: &mut BytesMut,
        data: &mut Vec<StoreValue>,
        version: Version,
    ) -> Result<(), IoError> {
        trace!("file encoding produce topic request");
        self.name.encode(src, version)?;
        self.partitions.file_encode(src, data, version)?;
        Ok(())
    }
}

impl FileWrite for FilePartitionRequest {
    fn file_encode(
        &self,
        src: &mut BytesMut,
        data: &mut Vec<StoreValue>,
        version: Version,
    ) -> Result<(), IoError> {
        trace!("file encoding for partition request");
        self.partition_index.encode(src, version)?;
        self.records.file_encode(src, data, version)?;
        Ok(())
    }
}

#[derive(Encode, Decode, FluvioDefault, Debug)]
pub struct TopicProduceData<R>
where
    R: Encoder + Decoder + Default + Debug,
{
    /// The topic name.
    pub name: String,

    /// Each partition to produce to.
    pub partitions: Vec<PartitionProduceData<R>>,
    pub data: PhantomData<R>,
}

#[derive(Encode, Decode, FluvioDefault, Debug)]
pub struct PartitionProduceData<R>
where
    R: Encoder + Decoder + Default + Debug,
{
    /// The partition index.
    pub partition_index: i32,

    /// The record data to be produced.
    pub records: R,
}