use std::{
    collections::HashMap,
    net::{IpAddr, SocketAddr},
    sync::Arc,
};

use jsonrpsee::{
    RpcModule,
    server::{ServerBuilder, ServerHandle},
    types::error::ErrorObjectOwned,
};
use serde::Deserialize;
use serde_json::{Value, json};

use crate::{
    dag::{DagError, FlowDag},
    models::{
        Actor, Context, Flow, FlowStatus, Job, JobStatus, Message, MessageFormatType,
        MessageStatus, Runner, ScriptType,
    },
    service::AppService,
    time::current_timestamp,
};

/// The OpenRPC specification for the HeroCoordinator JSON-RPC API
const OPENRPC_SPEC: &str = include_str!("../specs/openrpc.json");

pub struct AppState {
    pub service: AppService,
}

impl AppState {
    pub fn new(service: AppService) -> Self {
        Self { service }
    }
}

// -----------------------------
// Error helpers
// -----------------------------

fn invalid_params_err<E: std::fmt::Display>(e: E) -> ErrorObjectOwned {
    ErrorObjectOwned::owned(-32602, "Invalid params", Some(Value::String(e.to_string())))
}

fn storage_err(e: Box<dyn std::error::Error + Send + Sync>) -> ErrorObjectOwned {
    let msg = e.to_string();
    if msg.contains("Key not found") {
        ErrorObjectOwned::owned(-32001, "Not Found", Some(Value::String(msg)))
    } else {
        ErrorObjectOwned::owned(-32010, "Storage Error", Some(Value::String(msg)))
    }
}

fn dag_err(e: DagError) -> ErrorObjectOwned {
    match e {
        DagError::Storage(inner) => storage_err(inner),
        DagError::MissingDependency { .. } => ErrorObjectOwned::owned(
            -32020,
            "DAG Missing Dependency",
            Some(Value::String(e.to_string())),
        ),
        DagError::CycleDetected { .. } => ErrorObjectOwned::owned(
            -32021,
            "DAG Cycle Detected",
            Some(Value::String(e.to_string())),
        ),
        DagError::UnknownJob { .. } => ErrorObjectOwned::owned(
            -32022,
            "DAG Unknown Job",
            Some(Value::String(e.to_string())),
        ),
        DagError::DependenciesIncomplete { .. } => ErrorObjectOwned::owned(
            -32023,
            "DAG Dependencies Incomplete",
            Some(Value::String(e.to_string())),
        ),
        DagError::FlowFailed { .. } => ErrorObjectOwned::owned(
            -32024,
            "DAG Flow Failed",
            Some(Value::String(e.to_string())),
        ),
        DagError::JobNotStarted { .. } => ErrorObjectOwned::owned(
            -32025,
            "DAG Job Not Started",
            Some(Value::String(e.to_string())),
        ),
    }
}

// -----------------------------
// Create DTOs and Param wrappers
// -----------------------------

#[derive(Debug, Deserialize)]
pub struct ActorCreate {
    pub id: u32,
    pub pubkey: String,
    pub address: Vec<IpAddr>,
}
impl ActorCreate {
    pub fn into_domain(self) -> Result<Actor, String> {
        let ts = current_timestamp();
        let v = json!({
            "id": self.id,
            "pubkey": self.pubkey,
            "address": self.address,
            "created_at": ts,
            "updated_at": ts,
        });
        serde_json::from_value(v).map_err(|e| e.to_string())
    }
}

#[derive(Debug, Deserialize)]
pub struct ContextCreate {
    pub id: u32,
    pub admins: Vec<u32>,
    pub readers: Vec<u32>,
    pub executors: Vec<u32>,
}
impl ContextCreate {
    pub fn into_domain(self) -> Context {
        let ts = current_timestamp();

        let ContextCreate {
            id,
            admins,
            readers,
            executors,
        } = self;

        Context {
            id,
            admins,
            readers,
            executors,
            created_at: ts,
            updated_at: ts,
        }
    }
}

#[derive(Debug, Deserialize)]
pub struct RunnerCreate {
    pub id: u32,
    pub pubkey: String,
    pub address: IpAddr,
    pub topic: String,
    /// The script type this runner executes (used for routing)
    pub script_type: ScriptType,
    pub local: bool,
}
impl RunnerCreate {
    pub fn into_domain(self) -> Runner {
        let ts = current_timestamp();

        let RunnerCreate {
            id,
            pubkey,
            address,
            topic,
            script_type,
            local,
        } = self;

        Runner {
            id,
            pubkey,
            address,
            topic,
            script_type,
            local,
            created_at: ts,
            updated_at: ts,
        }
    }
}

#[derive(Debug, Deserialize)]
pub struct FlowCreate {
    pub id: u32,
    pub caller_id: u32,
    pub context_id: u32,
    pub jobs: Vec<u32>,
    pub env_vars: HashMap<String, String>,
}

impl FlowCreate {
    pub fn into_domain(self) -> Flow {
        let ts = current_timestamp();

        let FlowCreate {
            id,
            caller_id,
            context_id,
            jobs,
            env_vars,
        } = self;

        Flow {
            id,
            caller_id,
            context_id,
            jobs,
            env_vars,
            result: HashMap::new(),
            created_at: ts,
            updated_at: ts,
            status: FlowStatus::Created,
        }
    }
}

#[derive(Debug, Deserialize)]
pub struct JobCreate {
    pub id: u32,
    pub caller_id: u32,
    pub context_id: u32,
    pub script: String,
    pub script_type: ScriptType,
    pub timeout: u32,
    pub retries: u8,
    pub env_vars: HashMap<String, String>,
    pub prerequisites: Vec<String>,
    pub depends: Vec<u32>,
}

impl JobCreate {
    pub fn into_domain(self) -> Job {
        let ts = current_timestamp();

        let JobCreate {
            id,
            caller_id,
            context_id,
            script,
            script_type,
            timeout,
            retries,
            env_vars,
            prerequisites,
            depends,
        } = self;

        Job {
            id,
            caller_id,
            context_id,
            script,
            script_type,
            timeout,
            retries,
            env_vars,
            result: HashMap::new(),
            prerequisites,
            depends,
            created_at: ts,
            updated_at: ts,
            status: JobStatus::WaitingForPrerequisites,
        }
    }
}

#[derive(Debug, Deserialize)]
pub struct MessageCreate {
    pub id: u32,
    pub caller_id: u32,
    pub context_id: u32,
    pub message: String,
    pub message_type: ScriptType,
    pub message_format_type: MessageFormatType,
    pub timeout: u32,
    pub timeout_ack: u32,
    pub timeout_result: u32,
    pub job: Vec<JobCreate>,
}
impl MessageCreate {
    pub fn into_domain(self) -> Message {
        let ts = current_timestamp();

        let MessageCreate {
            id,
            caller_id,
            context_id,
            message,
            message_type,
            message_format_type,
            timeout,
            timeout_ack,
            timeout_result,
            job,
        } = self;

        Message {
            id,
            caller_id,
            context_id,
            message,
            message_type,
            message_format_type,
            timeout,
            timeout_ack,
            timeout_result,
            transport_id: None,
            transport_status: None,
            job: job.into_iter().map(JobCreate::into_domain).collect(),
            logs: Vec::new(),
            created_at: ts,
            updated_at: ts,
            status: MessageStatus::Dispatched,
        }
    }
}

#[derive(Debug, Deserialize)]
pub struct ActorCreateParams {
    pub actor: ActorCreate,
}
#[derive(Debug, Deserialize)]
pub struct ActorLoadParams {
    pub id: u32,
}

#[derive(Debug, Deserialize)]
pub struct ContextCreateParams {
    pub context: ContextCreate,
}
#[derive(Debug, Deserialize)]
pub struct ContextLoadParams {
    pub id: u32,
}

#[derive(Debug, Deserialize)]
pub struct RunnerCreateParams {
    pub context_id: u32,
    pub runner: RunnerCreate,
}
#[derive(Debug, Deserialize)]
pub struct RunnerLoadParams {
    pub context_id: u32,
    pub id: u32,
}

#[derive(Debug, Deserialize)]
pub struct FlowCreateParams {
    pub context_id: u32,
    pub flow: FlowCreate,
}
#[derive(Debug, Deserialize)]
pub struct FlowLoadParams {
    pub context_id: u32,
    pub id: u32,
}

#[derive(Debug, Deserialize)]
pub struct JobCreateParams {
    pub context_id: u32,
    pub job: JobCreate,
}
#[derive(Debug, Deserialize)]
pub struct JobLoadParams {
    pub context_id: u32,
    pub caller_id: u32,
    pub id: u32,
}

#[derive(Debug, Deserialize)]
pub struct MessageCreateParams {
    pub context_id: u32,
    pub message: MessageCreate,
}
#[derive(Debug, Deserialize)]
pub struct MessageLoadParams {
    pub context_id: u32,
    pub caller_id: u32,
    pub id: u32,
}

// -----------------------------
// Rpc module builder (manual registration)
// -----------------------------

pub fn build_module(state: Arc<AppState>) -> RpcModule<()> {
    let mut module: RpcModule<()> = RpcModule::new(());

    // Actor
    {
        let state = state.clone();
        module
            .register_async_method("actor.create", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: ActorCreateParams = params.parse().map_err(invalid_params_err)?;
                    let actor = p.actor.into_domain().map_err(invalid_params_err)?;
                    let actor = state
                        .service
                        .create_actor(actor)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(actor)
                }
            })
            .expect("register actor.create");
    }
    {
        let state = state.clone();
        module
            .register_async_method("actor.load", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: ActorLoadParams = params.parse().map_err(invalid_params_err)?;
                    let actor = state.service.load_actor(p.id).await.map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(actor)
                }
            })
            .expect("register actor.load");
    }

    // Context
    {
        let state = state.clone();
        module
            .register_async_method("context.create", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: ContextCreateParams = params.parse().map_err(invalid_params_err)?;
                    let ctx = p.context.into_domain();
                    let ctx = state
                        .service
                        .create_context(ctx)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(ctx)
                }
            })
            .expect("register context.create");
    }
    {
        let state = state.clone();
        module
            .register_async_method("context.load", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: ContextLoadParams = params.parse().map_err(invalid_params_err)?;
                    let ctx = state
                        .service
                        .load_context(p.id)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(ctx)
                }
            })
            .expect("register context.load");
    }

    // Runner
    {
        let state = state.clone();
        module
            .register_async_method("runner.create", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: RunnerCreateParams = params.parse().map_err(invalid_params_err)?;
                    let runner = p.runner.into_domain();
                    let runner = state
                        .service
                        .create_runner(p.context_id, runner)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(runner)
                }
            })
            .expect("register runner.create");
    }
    {
        let state = state.clone();
        module
            .register_async_method("runner.load", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: RunnerLoadParams = params.parse().map_err(invalid_params_err)?;
                    let runner = state
                        .service
                        .load_runner(p.context_id, p.id)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(runner)
                }
            })
            .expect("register runner.load");
    }

    // Flow
    {
        let state = state.clone();
        module
            .register_async_method("flow.create", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: FlowCreateParams = params.parse().map_err(invalid_params_err)?;
                    let flow = p.flow.into_domain();
                    let flow = state
                        .service
                        .create_flow(p.context_id, flow)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(flow)
                }
            })
            .expect("register flow.create");
    }
    {
        let state = state.clone();
        module
            .register_async_method("flow.load", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: FlowLoadParams = params.parse().map_err(invalid_params_err)?;
                    let flow = state
                        .service
                        .load_flow(p.context_id, p.id)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(flow)
                }
            })
            .expect("register flow.load");
    }
    {
        let state = state.clone();
        module
            .register_async_method("flow.dag", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: FlowLoadParams = params.parse().map_err(invalid_params_err)?;
                    let dag: FlowDag = state
                        .service
                        .flow_dag(p.context_id, p.id)
                        .await
                        .map_err(dag_err)?;
                    Ok::<_, ErrorObjectOwned>(dag)
                }
            })
            .expect("register flow.dag");
    }
    {
        let state = state.clone();
        module
            .register_async_method("flow.start", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: FlowLoadParams = params.parse().map_err(invalid_params_err)?;
                    let started: bool = state
                        .service
                        .flow_start(p.context_id, p.id)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(started)
                }
            })
            .expect("register flow.start");
    }

    // Job
    {
        let state = state.clone();
        module
            .register_async_method("job.create", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: JobCreateParams = params.parse().map_err(invalid_params_err)?;
                    let job = p.job.into_domain();
                    let job = state
                        .service
                        .create_job(p.context_id, job)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(job)
                }
            })
            .expect("register job.create");
    }
    {
        let state = state.clone();
        module
            .register_async_method("job.load", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: JobLoadParams = params.parse().map_err(invalid_params_err)?;
                    let job = state
                        .service
                        .load_job(p.context_id, p.caller_id, p.id)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(job)
                }
            })
            .expect("register job.load");
    }

    // Message
    {
        let state = state.clone();
        module
            .register_async_method("message.create", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: MessageCreateParams = params.parse().map_err(invalid_params_err)?;
                    let message = p.message.into_domain();
                    let message = state
                        .service
                        .create_message(p.context_id, message)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(message)
                }
            })
            .expect("register message.create");
    }
    {
        let state = state;
        module
            .register_async_method("message.load", move |params, _caller, _ctx| {
                let state = state.clone();
                async move {
                    let p: MessageLoadParams = params.parse().map_err(invalid_params_err)?;
                    let msg = state
                        .service
                        .load_message(p.context_id, p.caller_id, p.id)
                        .await
                        .map_err(storage_err)?;
                    Ok::<_, ErrorObjectOwned>(msg)
                }
            })
            .expect("register message.load");
    }
    {
        module
            .register_async_method("rpc.discover", move |_params, _caller, _ctx| async move {
                let spec = serde_json::from_str::<serde_json::Value>(OPENRPC_SPEC)
                    .expect("Failed to parse OpenRPC spec");
                Ok::<_, ErrorObjectOwned>(spec)
            })
            .expect("register rpc.discover");
    }

    module
}

// -----------------------------
// Server runners (HTTP/WS on separate listeners)
// -----------------------------

pub async fn start_http<C>(
    addr: SocketAddr,
    module: RpcModule<C>,
) -> Result<ServerHandle, Box<dyn std::error::Error + Send + Sync>> {
    let server = ServerBuilder::default().build(addr).await?;
    let handle = server.start(module);
    Ok(handle)
}

pub async fn start_ws<C>(
    addr: SocketAddr,
    module: RpcModule<C>,
) -> Result<ServerHandle, Box<dyn std::error::Error + Send + Sync>> {
    // jsonrpsee server supports both HTTP and WS; using a second listener gives us a dedicated WS port.
    let server = ServerBuilder::default().build(addr).await?;
    let handle = server.start(module);
    Ok(handle)
}