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use std::io::Write;

use crate::{
    codec::{Decoder, Encoder},
    error::{DecodeError, EncodeError},
    protocol::commands::COMMAND_PUBLISH,
    protocol::version::PROTOCOL_VERSION_2,
};

use super::Command;

use crate::types::PublishedMessage;

#[cfg(test)]
use fake::Fake;

#[cfg_attr(test, derive(fake::Dummy))]
#[derive(PartialEq, Eq, Debug)]
pub struct PublishCommand {
    publisher_id: u8,
    published_messages: Vec<PublishedMessage>,
    #[cfg_attr(test, dummy(faker = "1"))]
    version: u16,
}

impl PublishCommand {
    pub fn new(publisher_id: u8, published_messages: Vec<PublishedMessage>, version: u16) -> Self {
        Self {
            publisher_id,
            published_messages,
            version,
        }
    }
}

impl Encoder for PublishCommand {
    fn encoded_size(&self) -> u32 {
        if self.version == PROTOCOL_VERSION_2 {
            self.publisher_id.encoded_size() + self.published_messages.encoded_size_version_2()
        } else {
            self.publisher_id.encoded_size() + self.published_messages.encoded_size()
        }
    }

    fn encode(&self, writer: &mut impl Write) -> Result<(), EncodeError> {
        self.publisher_id.encode(writer)?;
        if self.version == PROTOCOL_VERSION_2 {
            self.published_messages.encode_version_2(writer)?;
        } else {
            self.published_messages.encode(writer)?;
        }
        Ok(())
    }
}

impl Command for PublishCommand {
    fn key(&self) -> u16 {
        COMMAND_PUBLISH
    }

    fn version(&self) -> u16 {
        self.version
    }
}

impl Decoder for PublishCommand {
    fn decode(input: &[u8]) -> Result<(&[u8], Self), DecodeError> {
        let (input, publisher_id) = u8::decode(input)?;
        let (input, published_messages) = Vec::decode(input)?;

        Ok((
            input,
            PublishCommand {
                publisher_id,
                published_messages,
                version: 1,
            },
        ))
    }
}

#[cfg(test)]
mod tests {

    use crate::commands::tests::command_encode_decode_test;

    use super::PublishCommand;

    #[test]
    fn publish_request_test() {
        command_encode_decode_test::<PublishCommand>();
    }
}