//! The live pool: configuration, the share verifier engine, the ledger, the connected members and their jobs.

use crate::config::Config;
use crate::state::State;
use crate::vardiff::Vardiff;
use crate::verify::JobKey;
use kaspa_consensus_core::finality::KeyReveal;
use kaspa_grpc_client::GrpcClient;
use kaspa_hashes::Hash;
use kaspa_pow::igneum::{EpochRef, EpochSeeds, IgneumEngine};
use kaspa_rpc_core::RpcRawBlock;
use std::collections::{HashMap, HashSet, VecDeque};
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::{Arc, Mutex};
use std::time::Instant;

/// A job issued to one member: the template it was built on and what its shares are checked against.
pub struct JobRec {
    pub job_id: u64,
    pub template_id: u64,
    pub raw: RpcRawBlock,
    pub key: JobKey,
    pub epoch: Arc<EpochRef>,
    pub shift: u32,
    pub issued: Instant,
    /// Set when a job on a newer tip was issued: shares after the grace are stale
    pub superseded_at: Option<Instant>,
    pub seen: HashSet<u64>,
    pub daa_score: u64,
    pub blue_score: u64,
}

pub struct MemberInner {
    pub vardiff: Vardiff,
    pub jobs: VecDeque<JobRec>,
    pub last_parents: Option<Vec<Hash>>,
    pub last_seeds: Option<EpochSeeds>,
    pub accepted: u64,
    pub stale: u64,
    pub rejected: u64,
    pub blocks: u64,
    pub refused: u64,
    pub last_share: Option<Instant>,
    pub revealed: bool,
    /// The member's own report (spec `stats`): hashrate, workers, and the proving flag (consequence C6)
    pub reported_hashrate: f64,
    pub reported_workers: u32,
    pub proving: bool,
    pub current_target64: u64,
    pub in_flight_checks: u32,
}

pub struct Member {
    pub id: u64,
    pub address: String,
    pub worker: String,
    pub key_hash: Hash,
    pub reveal: KeyReveal,
    pub remote: String,
    pub connected_at: Instant,
    pub tx: tokio::sync::mpsc::UnboundedSender<String>,
    pub inner: Mutex<MemberInner>,
}

impl Member {
    pub fn send(&self, line: String) {
        let _ = self.tx.send(line);
    }
    pub fn job(&self, job_id: u64) -> Option<(JobKey, Arc<EpochRef>, u32, bool, u64, u64)> {
        let g = self.inner.lock().unwrap();
        g.jobs.iter().find(|j| j.job_id == job_id).map(|j| (j.key.clone(), j.epoch.clone(), j.shift, j.superseded_at.is_some(), j.daa_score, j.blue_score))
    }
}

/// The network numbers the API reports beside the pool's own, refreshed every 5 s from the primary node.
#[derive(Clone, Debug, Default, serde::Serialize)]
pub struct NetInfo {
    pub network: String,
    pub chain_id: u64,
    pub difficulty: f64,
    pub hashrate: Option<f64>,
    pub daa_score: u64,
    pub block_count: u64,
    pub blue_score: u64,
    pub synced: bool,
    pub node_version: String,
    pub block_reward_ign: f64,
    pub miner_reward_ign: f64,
    pub updated_ms: u64,
    pub epoch_seed: String,
    pub epoch_index: u64,
}

pub struct Pool {
    pub cfg: Config,
    pub engine: Arc<IgneumEngine>,
    pub state: Mutex<State>,
    pub members: Mutex<HashMap<u64, Arc<Member>>>,
    pub next_member_id: AtomicU64,
    pub next_template_id: AtomicU64,
    pub next_job_id: AtomicU64,
    pub node: Arc<GrpcClient>,
    /// A second connection to the same node for the confirmation walk and the network numbers (7 October 2026,
    /// 06:01Z and 06:12:55Z: the walk's `get_block` calls shared the template connection and starved every template
    /// request; the gRPC client is one request stream per connection)
    pub walker: Arc<GrpcClient>,
    pub extra_nodes: Vec<Arc<GrpcClient>>,
    /// The pool's EVM coinbase address, lowercase 0x hex, named in every template's `IGNA` field
    pub pool_address: [u8; 20],
    pub pool_address_hex: String,
    pub pay_address: kaspa_addresses::Address,
    pub net: Mutex<NetInfo>,
    pub want_templates: tokio::sync::Notify,
    pub verify_permits: tokio::sync::Semaphore,
    pub started: Instant,
    /// Template fetches that failed or timed out since start, and the unix ms of the last one that succeeded (0 =
    /// never): a daemon whose node answers no template issues no job, and the STATUS line in the log says so
    pub template_failures: AtomicU64,
    pub last_template_ok_ms: AtomicU64,
}

impl Pool {
    pub fn members_snapshot(&self) -> Vec<Arc<Member>> {
        self.members.lock().unwrap().values().cloned().collect()
    }
    pub fn online(&self) -> (usize, usize) {
        let m = self.members.lock().unwrap();
        let addresses: HashSet<&str> = m.values().map(|x| x.address.as_str()).collect();
        (addresses.len(), m.len())
    }
    pub fn now_s(&self) -> f64 {
        self.started.elapsed().as_secs_f64()
    }
    pub fn template_id(&self) -> u64 {
        self.next_template_id.fetch_add(1, Ordering::Relaxed) + 1
    }
    pub fn job_id(&self) -> u64 {
        self.next_job_id.fetch_add(1, Ordering::Relaxed) + 1
    }
}