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use anyhow::{anyhow, Result};
use rdkafka::error::KafkaError;
use rdkafka::message::BorrowedMessage;
use rdkafka::Message;
use serde::Deserialize;
use std::convert::TryFrom;

pub mod consumer;
pub mod producer;

#[derive(Clone, Debug, PartialEq, Deserialize)]
pub struct KafkaConfig {
    pub brokers_csv: String,
    pub flush_duration_millis: u64,
    pub poll_duration_millis: u64,
    pub security_protocol: Option<String>,
}

impl KafkaConfig {
    pub fn brokers(&self) -> Vec<&str> {
        self.brokers_csv.split(',').collect()
    }
}

pub type Bytes = Vec<u8>;
pub struct KafkaMessage {
    pub value: Bytes,
}
pub struct KafkaMessages {
    pub messages: Vec<KafkaMessage>,
}

impl From<Vec<u8>> for KafkaMessage {
    fn from(byte_vector: Vec<u8>) -> Self {
        Self { value: byte_vector }
    }
}

impl<'a> TryFrom<BorrowedMessage<'a>> for KafkaMessage {
    type Error = anyhow::Error;

    fn try_from(value: BorrowedMessage<'a>) -> Result<Self> {
        value
            .payload()
            .ok_or_else(|| anyhow!("Unable to deserialize to byte arrays"))
            .map(|x| x.to_vec())
            .map(KafkaMessage::from)
    }
}

impl<'a> TryFrom<core::result::Result<BorrowedMessage<'a>, KafkaError>> for KafkaMessage {
    type Error = anyhow::Error;

    fn try_from(value: core::result::Result<BorrowedMessage<'a>, KafkaError>) -> Result<Self> {
        value
            .map_err::<anyhow::Error, _>(|err| err.into())
            .and_then(KafkaMessage::try_from)
    }
}

pub struct KafkaKeyMessagePair {
    pub key: String,
    pub message: KafkaMessage,
}