use ractor::RpcReplyPort;
use ractor_cluster::BytesConvertable;
use ractor_cluster::RactorClusterMessage;
use crate::pb::RepositoryHeader;

impl BytesConvertable for RepositoryHeader {
    fn into_bytes(self) -> Vec<u8> {
        prost::Message::encode_to_vec(&self)
    }

    fn from_bytes(bytes: Vec<u8>) -> Self {
        prost::Message::decode(bytes.as_slice()).unwrap_or_default()
    }
}

#[derive(Debug, Clone)]
pub struct RouteDecision {
    pub found: bool,
    pub storage_name: String,
    pub relative_path: String,
    pub actor_name: String,
    pub grpc_addr: String,
}

impl BytesConvertable for RouteDecision {
    fn into_bytes(self) -> Vec<u8> {
        encode_strings(&[
            if self.found { "1" } else { "0" }.to_string(),
            self.storage_name,
            self.relative_path,
            self.actor_name,
            self.grpc_addr,
        ])
    }

    fn from_bytes(bytes: Vec<u8>) -> Self {
        let values = decode_strings(bytes);
        Self {
            found: values.first().is_some_and(|v| v == "1"),
            storage_name: values.get(1).cloned().unwrap_or_default(),
            relative_path: values.get(2).cloned().unwrap_or_default(),
            actor_name: values.get(3).cloned().unwrap_or_default(),
            grpc_addr: values.get(4).cloned().unwrap_or_default(),
        }
    }
}

#[derive(Debug, Clone)]
pub struct NodeHealth {
    pub storage_name: String,
    pub repo_count: u64,
    pub healthy: bool,
    pub version: String,
}

impl BytesConvertable for NodeHealth {
    fn into_bytes(self) -> Vec<u8> {
        encode_strings(&[
            self.storage_name,
            self.repo_count.to_string(),
            if self.healthy { "1" } else { "0" }.to_string(),
            self.version,
        ])
    }

    fn from_bytes(bytes: Vec<u8>) -> Self {
        let values = decode_strings(bytes);
        Self {
            storage_name: values.first().cloned().unwrap_or_default(),
            repo_count: values.get(1).and_then(|v| v.parse().ok()).unwrap_or_default(),
            healthy: values.get(2).is_some_and(|v| v == "1"),
            version: values.get(3).cloned().unwrap_or_default(),
        }
    }
}

#[derive(RactorClusterMessage)]
pub enum GitNodeMessage {
    ScanAndRegister,

    RegisterRepository(RepositoryHeader),

    RemoveRepository(RepositoryHeader),

    #[rpc]
    RouteRepository(RepositoryHeader, RpcReplyPort<RouteDecision>),

    #[rpc]
    ListRepositoryPaths(RpcReplyPort<String>),

    #[rpc]
    RepositoryExists(RepositoryHeader, RpcReplyPort<bool>),

    #[rpc]
    GetNodeHealth(RpcReplyPort<NodeHealth>),
}

#[derive(ractor_cluster::RactorMessage)]
pub enum RepoActorMessage {
    UpdateMetadata(RepositoryHeader),
}

fn encode_strings(values: &[String]) -> Vec<u8> {
    let mut buf = Vec::new();
    for value in values {
        let bytes = value.as_bytes();
        buf.extend((bytes.len() as u64).to_be_bytes());
        buf.extend(bytes);
    }
    buf
}

fn decode_strings(bytes: Vec<u8>) -> Vec<String> {
    let mut values = Vec::new();
    let mut offset = 0;
    while offset + 8 <= bytes.len() {
        let len = u64::from_be_bytes(bytes[offset..offset + 8].try_into().unwrap()) as usize;
        offset += 8;
        if offset + len > bytes.len() {
            break;
        }
        values.push(String::from_utf8_lossy(&bytes[offset..offset + len]).into_owned());
        offset += len;
    }
    values
}