paygress-cli 0.1.9

// Pure aggregator: turns observed Nostr events into a reproducible
// JSON snapshot. No I/O, no clock — `now` and stake statuses are
// inputs, so two invocations with the same inputs produce
// byte-identical bytes regardless of where they run.

use std::collections::{BTreeMap, HashMap, HashSet};

use serde::{Deserialize, Serialize};

use crate::nostr::{HeartbeatContent, IsolationLevel, PodSpec, ProviderOfferContent};
use crate::reputation::{score_provider, CompletionReceipt, ConsumerProfile, SybilHeuristics};
use crate::stake::{stake_rank, StakeStatus};

/// Wire format for the snapshot. Versioned from day one so the
/// static frontend can branch on schema bumps without breaking old
/// archives.
pub const SNAPSHOT_VERSION: u8 = 1;

/// Receipt window: receipts older than this are aged out of the
/// rolling-window score. 30 days per the plan's R10.
pub const RECEIPT_WINDOW_SECS: u64 = 30 * 24 * 3600;

/// Inputs to a single aggregator run. The caller (binary entry
/// point) is responsible for I/O — fetching offers/heartbeats/
/// receipts from Nostr, fetching stake statuses from Esplora,
/// loading consumer first-seen times. Once those are in hand, the
/// snapshot is a pure function of them.
pub struct AggregatorInput {
    pub offers: Vec<ProviderOfferContent>,
    pub heartbeats: Vec<HeartbeatContent>,
    pub receipts: Vec<CompletionReceipt>,
    pub consumers: HashMap<String, ConsumerProfile>,
    /// Pre-computed by the binary entry point against Esplora,
    /// keyed by `provider_npub`. Letting the caller pass these in
    /// keeps `compute_snapshot` pure and lets two independent
    /// runs reproduce as long as they pass the same data.
    pub stake_statuses: HashMap<String, StakeStatus>,
    /// 5 anchor providers (Paygress-team-run) flagged in the UI.
    pub anchor_providers: HashSet<String>,
}

/// Top-level snapshot the static frontend reads.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Snapshot {
    pub version: u8,
    pub generated_at: u64,
    /// Receipts older than `now - RECEIPT_WINDOW_SECS` were
    /// excluded. Stamped here so consumers can verify reproducibility.
    pub receipt_window_secs: u64,
    /// Sorted by `npub` for byte-identical reproducibility.
    pub providers: Vec<ProviderSummary>,
}

/// One provider's row in the snapshot.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProviderSummary {
    pub npub: String,
    pub hostname: String,
    /// Coarse jurisdiction. Only present if the offer opted in
    /// (`location.is_some()`). The plan guarantees no involuntary
    /// geo surfacing.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub jurisdiction: Option<String>,
    /// Sybil-resistant score from the receipt set restricted to
    /// the rolling window. See `paygress::reputation`.
    pub score: f32,
    /// Last seen (most recent heartbeat across the input set).
    pub last_seen_unix: Option<u64>,
    /// `Some` only if the offer carried a stake proof AND the
    /// pre-computed `StakeStatus` was `Valid`.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub stake: Option<StakeSummary>,
    pub anchor: bool,
    pub specs: Vec<PodSpec>,
    pub isolation_level: IsolationLevel,
}

/// What we render about a provider's stake when it verifies.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StakeSummary {
    pub effective_sats: u64,
    pub locktime_unix: u64,
    /// log(sats × locked_seconds), used for staked-tier ordering.
    pub rank: f64,
}

/// Compute the snapshot. Pure: no clock, no network, no filesystem.
pub fn compute_snapshot(input: &AggregatorInput, now: u64) -> Snapshot {
    let heuristics = SybilHeuristics::default();
    let receipt_floor = now.saturating_sub(RECEIPT_WINDOW_SECS);

    // Filter receipts to the rolling window once; reused across
    // every provider.
    let windowed: Vec<&CompletionReceipt> = input
        .receipts
        .iter()
        .filter(|r| r.completed_at >= receipt_floor)
        .collect();

    // Most-recent heartbeat per provider, across the input set.
    let mut last_seen: HashMap<&str, u64> = HashMap::new();
    for hb in &input.heartbeats {
        let cur = last_seen.entry(hb.provider_npub.as_str()).or_insert(0);
        if hb.timestamp > *cur {
            *cur = hb.timestamp;
        }
    }

    // Build per-provider rows. Use a BTreeMap so iteration order is
    // deterministic by npub — the reproducibility property.
    let mut by_npub: BTreeMap<&str, &ProviderOfferContent> = BTreeMap::new();
    for offer in &input.offers {
        by_npub.insert(offer.provider_npub.as_str(), offer);
    }

    let mut providers = Vec::with_capacity(by_npub.len());
    for (npub, offer) in by_npub {
        // Score: pass closures that always-accept signatures and
        // payment proofs. Real aggregator wires these to nostr-sdk
        // Schnorr verification + cdk mint-key checks; for the pure
        // snapshot path we trust the caller to have pre-filtered
        // bad receipts (they would be dropped during the
        // Nostr-crawl step).
        let receipts_owned: Vec<CompletionReceipt> =
            windowed.iter().map(|r| (*r).clone()).collect();
        let score = score_provider(
            npub,
            &receipts_owned,
            &input.consumers,
            now,
            &heuristics,
            |_| true,
            |_| true,
        );

        let stake = input.stake_statuses.get(npub).and_then(|s| match s {
            StakeStatus::Valid {
                effective_sats,
                locktime_unix,
            } => Some(StakeSummary {
                effective_sats: *effective_sats,
                locktime_unix: *locktime_unix,
                rank: stake_rank(*effective_sats, *locktime_unix, now),
            }),
            _ => None,
        });

        providers.push(ProviderSummary {
            npub: npub.to_string(),
            hostname: offer.hostname.clone(),
            jurisdiction: offer.location.clone(),
            score,
            last_seen_unix: last_seen.get(npub).copied(),
            stake,
            anchor: input.anchor_providers.contains(npub),
            specs: offer.specs.clone(),
            isolation_level: offer.isolation_level.clone(),
        });
    }

    Snapshot {
        version: SNAPSHOT_VERSION,
        generated_at: now,
        receipt_window_secs: RECEIPT_WINDOW_SECS,
        providers,
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::nostr::{CapacityInfo, IsolationLevel, SCHEMA_VERSION};
    use crate::reputation::PaymentProof;
    use crate::stake::StakeStatus;

    fn offer(npub: &str, hostname: &str, location: Option<&str>) -> ProviderOfferContent {
        ProviderOfferContent {
            provider_npub: npub.to_string(),
            hostname: hostname.to_string(),
            location: location.map(|s| s.to_string()),
            capabilities: vec!["lxc".to_string()],
            specs: vec![],
            whitelisted_mints: vec!["https://mint.example".to_string()],
            uptime_percent: 99.0,
            total_jobs_completed: 5,
            api_endpoint: None,
            version: SCHEMA_VERSION,
            isolation_level: IsolationLevel::SharedKernel,
            stake_proof: None,
        }
    }

    fn heartbeat(npub: &str, ts: u64) -> HeartbeatContent {
        HeartbeatContent {
            provider_npub: npub.to_string(),
            timestamp: ts,
            active_workloads: 0,
            available_capacity: CapacityInfo {
                cpu_available: 0,
                memory_mb_available: 0,
                storage_gb_available: 0,
            },
            version: SCHEMA_VERSION,
        }
    }

    fn receipt(provider: &str, consumer: &str, completed_at: u64) -> CompletionReceipt {
        CompletionReceipt {
            lease_id: format!("l-{}-{}-{}", provider, consumer, completed_at),
            provider_npub: provider.to_string(),
            consumer_npub: consumer.to_string(),
            duration_paid: 3600,
            duration_delivered: 3600,
            success_flag: 1.0,
            payment_proof: PaymentProof {
                mint_url: "https://mint.example".to_string(),
                swap_response_signature: "sig".to_string(),
            },
            version: 1,
            consumer_signature: Some("c".to_string()),
            provider_co_signature: Some("p".to_string()),
            completed_at,
        }
    }

    #[test]
    fn snapshot_is_byte_identical_when_inputs_match() {
        let now = 1_700_000_000;
        let input = AggregatorInput {
            offers: vec![
                offer("npubB", "host-b", None),
                offer("npubA", "host-a", Some("BER")),
            ],
            heartbeats: vec![heartbeat("npubA", now - 60), heartbeat("npubA", now - 120)],
            receipts: vec![],
            consumers: HashMap::new(),
            stake_statuses: HashMap::new(),
            anchor_providers: HashSet::new(),
        };
        let snap_a = compute_snapshot(&input, now);
        let snap_b = compute_snapshot(&input, now);
        let json_a = serde_json::to_string(&snap_a).unwrap();
        let json_b = serde_json::to_string(&snap_b).unwrap();
        assert_eq!(json_a, json_b);
    }

    #[test]
    fn providers_are_sorted_by_npub_for_reproducibility() {
        let now = 1_700_000_000;
        let input = AggregatorInput {
            offers: vec![
                offer("npubZ", "z", None),
                offer("npubA", "a", None),
                offer("npubM", "m", None),
            ],
            heartbeats: vec![],
            receipts: vec![],
            consumers: HashMap::new(),
            stake_statuses: HashMap::new(),
            anchor_providers: HashSet::new(),
        };
        let snap = compute_snapshot(&input, now);
        let order: Vec<_> = snap.providers.iter().map(|p| p.npub.as_str()).collect();
        assert_eq!(order, vec!["npubA", "npubM", "npubZ"]);
    }

    #[test]
    fn jurisdiction_is_only_emitted_if_offer_opted_in() {
        let now = 1_700_000_000;
        let input = AggregatorInput {
            offers: vec![
                offer("npubA", "a", Some("BER")),
                offer("npubB", "b", None), // opted out
            ],
            heartbeats: vec![],
            receipts: vec![],
            consumers: HashMap::new(),
            stake_statuses: HashMap::new(),
            anchor_providers: HashSet::new(),
        };
        let snap = compute_snapshot(&input, now);
        let by: HashMap<_, _> = snap
            .providers
            .iter()
            .map(|p| (p.npub.as_str(), p))
            .collect();
        assert_eq!(by["npubA"].jurisdiction.as_deref(), Some("BER"));
        assert!(by["npubB"].jurisdiction.is_none());
    }

    #[test]
    fn old_receipts_are_aged_out_of_window() {
        let now = 1_700_000_000;
        let in_window = receipt("P", "C", now - 7 * 24 * 3600); // 7 days ago
        let out_of_window = receipt("P", "C", now - 60 * 24 * 3600); // 60 days ago
        let mut consumers = HashMap::new();
        consumers.insert(
            "C".to_string(),
            ConsumerProfile {
                npub: "C".to_string(),
                first_seen: now - 365 * 24 * 3600, // very old, passes history gate
            },
        );
        let input = AggregatorInput {
            offers: vec![offer("P", "p", None)],
            heartbeats: vec![],
            receipts: vec![in_window, out_of_window],
            consumers,
            stake_statuses: HashMap::new(),
            anchor_providers: HashSet::new(),
        };
        let snap = compute_snapshot(&input, now);
        // One windowed receipt from one consumer at one provider →
        // capped to max_share = 0.20 by the Sybil cap.
        assert!((snap.providers[0].score - 0.20).abs() < 1e-6);
    }

    #[test]
    fn anchor_providers_are_flagged() {
        let now = 1_700_000_000;
        let mut anchors = HashSet::new();
        anchors.insert("npubAnchor".to_string());
        let input = AggregatorInput {
            offers: vec![
                offer("npubAnchor", "anchor", None),
                offer("npubOther", "other", None),
            ],
            heartbeats: vec![],
            receipts: vec![],
            consumers: HashMap::new(),
            stake_statuses: HashMap::new(),
            anchor_providers: anchors,
        };
        let snap = compute_snapshot(&input, now);
        let by: HashMap<_, _> = snap
            .providers
            .iter()
            .map(|p| (p.npub.as_str(), p))
            .collect();
        assert!(by["npubAnchor"].anchor);
        assert!(!by["npubOther"].anchor);
    }

    #[test]
    fn stake_summary_only_emitted_when_status_is_valid() {
        let now = 1_700_000_000;
        let mut stake_statuses = HashMap::new();
        stake_statuses.insert(
            "npubStaked".to_string(),
            StakeStatus::Valid {
                effective_sats: 100_000,
                locktime_unix: now + 30 * 24 * 3600,
            },
        );
        stake_statuses.insert("npubSpent".to_string(), StakeStatus::Spent);
        let input = AggregatorInput {
            offers: vec![
                offer("npubStaked", "s", None),
                offer("npubSpent", "x", None),
            ],
            heartbeats: vec![],
            receipts: vec![],
            consumers: HashMap::new(),
            stake_statuses,
            anchor_providers: HashSet::new(),
        };
        let snap = compute_snapshot(&input, now);
        let by: HashMap<_, _> = snap
            .providers
            .iter()
            .map(|p| (p.npub.as_str(), p))
            .collect();
        assert!(by["npubStaked"].stake.is_some());
        assert!(by["npubSpent"].stake.is_none());
        // Stake rank > 0 for a valid lock.
        assert!(by["npubStaked"].stake.as_ref().unwrap().rank > 0.0);
    }

    #[test]
    fn last_seen_picks_max_timestamp() {
        let now = 1_700_000_000;
        let input = AggregatorInput {
            offers: vec![offer("P", "p", None)],
            heartbeats: vec![
                heartbeat("P", now - 600),
                heartbeat("P", now - 60),
                heartbeat("P", now - 300),
            ],
            receipts: vec![],
            consumers: HashMap::new(),
            stake_statuses: HashMap::new(),
            anchor_providers: HashSet::new(),
        };
        let snap = compute_snapshot(&input, now);
        assert_eq!(snap.providers[0].last_seen_unix, Some(now - 60));
    }

    #[test]
    fn empty_input_yields_empty_provider_list() {
        let now = 1_700_000_000;
        let input = AggregatorInput {
            offers: vec![],
            heartbeats: vec![],
            receipts: vec![],
            consumers: HashMap::new(),
            stake_statuses: HashMap::new(),
            anchor_providers: HashSet::new(),
        };
        let snap = compute_snapshot(&input, now);
        assert_eq!(snap.providers.len(), 0);
        assert_eq!(snap.version, SNAPSHOT_VERSION);
        assert_eq!(snap.receipt_window_secs, RECEIPT_WINDOW_SECS);
    }
}