//! AZ-680 + AZ-681 — operator-command dispatcher acceptance tests.
//!
//! These tests exercise the dispatcher through the public
//! `OperatorBridgeHandle::dispatch_command` surface so the wiring
//! between the surfaced-POI registry, the idempotency cache, the
//! scan router, the safety router, the BIT severity lookup, and the
//! audit sink is covered end-to-end.

use std::sync::Arc;
use std::sync::Mutex as StdMutex;

use async_trait::async_trait;
use chrono::{Duration as ChronoDuration, Utc};
use parking_lot::Mutex;
use serde_json::json;
use uuid::Uuid;

use operator_bridge::{
    ack_reasons, AuditEntry, AuditSink, CommandAck, OperatorBridge, SurfacedPoi,
};
use shared::contracts::{BitReportSeverityLookup, MissionSafetyRouter, ScanCommandRouter};
use shared::error::Result;
use shared::models::operator::{OperatorCommand, OperatorCommandKind, SafetyOverrideScope};

// ============================================================================
// Test doubles
// ============================================================================

#[derive(Default)]
struct RecordingScanRouter {
    calls: StdMutex<Vec<OperatorCommand>>,
}

#[async_trait]
impl ScanCommandRouter for RecordingScanRouter {
    async fn route(&self, command: OperatorCommand) -> Result<()> {
        self.calls.lock().unwrap().push(command);
        Ok(())
    }
}

#[derive(Default)]
struct RecordingSafetyRouter {
    bit_acks: StdMutex<Vec<(Uuid, Option<String>)>>,
    overrides: StdMutex<Vec<(SafetyOverrideScope, u32, String, String)>>,
}

#[async_trait]
impl MissionSafetyRouter for RecordingSafetyRouter {
    async fn acknowledge_bit_degraded(
        &self,
        report_id: Uuid,
        operator_id: Option<String>,
    ) -> Result<()> {
        self.bit_acks.lock().unwrap().push((report_id, operator_id));
        Ok(())
    }

    async fn apply_safety_override(
        &self,
        scope: SafetyOverrideScope,
        duration_secs: u32,
        operator_id: String,
        rationale: String,
    ) -> Result<()> {
        self.overrides
            .lock()
            .unwrap()
            .push((scope, duration_secs, operator_id, rationale));
        Ok(())
    }
}

/// Severity lookup that returns whatever is registered for each id.
/// `Some(true)` for acknowledgeable (Degraded), `Some(false)` for
/// Fail, `None` for unknown.
#[derive(Default)]
struct StubBitSeverity {
    inner: StdMutex<std::collections::HashMap<Uuid, bool>>,
}

impl StubBitSeverity {
    fn set(&self, report_id: Uuid, acknowledgeable: bool) {
        self.inner
            .lock()
            .unwrap()
            .insert(report_id, acknowledgeable);
    }
}

#[async_trait]
impl BitReportSeverityLookup for StubBitSeverity {
    async fn is_acknowledgeable(&self, report_id: Uuid) -> Option<bool> {
        self.inner.lock().unwrap().get(&report_id).copied()
    }
}

#[derive(Default, Clone)]
struct RecordingAuditSink {
    entries: Arc<Mutex<Vec<AuditEntry>>>,
}

#[async_trait]
impl AuditSink for RecordingAuditSink {
    async fn record(&self, entry: AuditEntry) {
        self.entries.lock().push(entry);
    }
}

// ============================================================================
// Helpers
// ============================================================================

fn cmd(kind: OperatorCommandKind, payload: serde_json::Value) -> OperatorCommand {
    OperatorCommand {
        command_id: Uuid::new_v4(),
        session_token: "session".to_string(),
        sequence_number: 1,
        issued_at_wallclock: Utc::now(),
        kind,
        payload,
        signature: vec![],
    }
}

fn surfaced(deadline_secs: i64) -> SurfacedPoi {
    SurfacedPoi {
        poi_id: Uuid::new_v4(),
        mgrs: "33UWP05".into(),
        class_group: "vehicle".into(),
        deadline: Utc::now() + ChronoDuration::seconds(deadline_secs),
    }
}

struct Harness {
    bridge: OperatorBridge,
    scan: Arc<RecordingScanRouter>,
    safety: Arc<RecordingSafetyRouter>,
    severity: Arc<StubBitSeverity>,
    audit: RecordingAuditSink,
}

fn harness() -> Harness {
    let scan = Arc::new(RecordingScanRouter::default());
    let safety = Arc::new(RecordingSafetyRouter::default());
    let severity = Arc::new(StubBitSeverity::default());
    let audit = RecordingAuditSink::default();
    let bridge = OperatorBridge::new(8)
        .with_scan_router(scan.clone() as Arc<dyn ScanCommandRouter>)
        .with_safety_router(safety.clone() as Arc<dyn MissionSafetyRouter>)
        .with_bit_severity_lookup(severity.clone() as Arc<dyn BitReportSeverityLookup>)
        .with_audit_sink(Arc::new(audit.clone()) as Arc<dyn AuditSink>)
        .with_dispatcher();
    Harness {
        bridge,
        scan,
        safety,
        severity,
        audit,
    }
}

// ============================================================================
// AZ-680 ACs
// ============================================================================

/// AZ-680 AC-1 — Confirm forwards target hint.
#[tokio::test]
async fn az680_ac1_confirm_forwards_to_scan_router() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();
    let surfaced = surfaced(120);
    h.bridge.surfaced_registry().record(surfaced.clone());

    // Act
    let ack = handle
        .dispatch_command(cmd(
            OperatorCommandKind::ConfirmPoi,
            json!({ "poi_id": surfaced.poi_id.to_string() }),
        ))
        .await;

    // Assert
    assert_eq!(ack, CommandAck::Ok);
    let calls = h.scan.calls.lock().unwrap();
    assert_eq!(calls.len(), 1, "scan_router::route called exactly once");
    assert!(matches!(calls[0].kind, OperatorCommandKind::ConfirmPoi));
}

/// AZ-680 AC-2 — Re-transmit returns cached ack.
#[tokio::test]
async fn az680_ac2_retransmit_returns_cached_ack() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();
    let surfaced = surfaced(120);
    h.bridge.surfaced_registry().record(surfaced.clone());
    let command = cmd(
        OperatorCommandKind::ConfirmPoi,
        json!({ "poi_id": surfaced.poi_id.to_string() }),
    );

    // Act — same command_id dispatched twice
    let ack1 = handle.dispatch_command(command.clone()).await;
    let ack2 = handle.dispatch_command(command.clone()).await;

    // Assert
    assert_eq!(ack1, CommandAck::Ok);
    assert_eq!(ack2, CommandAck::Ok);
    let calls = h.scan.calls.lock().unwrap();
    assert_eq!(
        calls.len(),
        1,
        "scan_router::route must be invoked exactly once across retransmits"
    );
}

/// AZ-680 AC-3 — Unknown POI id rejected.
#[tokio::test]
async fn az680_ac3_unknown_poi_id_rejected() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();

    // Act — POI id never surfaced
    let ack = handle
        .dispatch_command(cmd(
            OperatorCommandKind::ConfirmPoi,
            json!({ "poi_id": Uuid::new_v4().to_string() }),
        ))
        .await;

    // Assert
    assert_eq!(ack.reason(), Some(ack_reasons::UNKNOWN_POI_ID));
    assert!(
        h.scan.calls.lock().unwrap().is_empty(),
        "scan_router must not be invoked"
    );
}

/// AZ-680 AC-4 — Expired POI rejected.
#[tokio::test]
async fn az680_ac4_expired_poi_rejected() {
    // Arrange — surface a POI whose deadline has already passed.
    let h = harness();
    let handle = h.bridge.handle();
    let expired = SurfacedPoi {
        deadline: Utc::now() - ChronoDuration::seconds(1),
        ..surfaced(0)
    };
    h.bridge.surfaced_registry().record(expired.clone());

    // Act
    let ack = handle
        .dispatch_command(cmd(
            OperatorCommandKind::ConfirmPoi,
            json!({ "poi_id": expired.poi_id.to_string() }),
        ))
        .await;

    // Assert
    assert_eq!(ack.reason(), Some(ack_reasons::EXPIRED));
    assert!(
        h.scan.calls.lock().unwrap().is_empty(),
        "scan_router must not be invoked on expired POI"
    );
}

/// AZ-680 AC-5 — Decline appends IgnoredItem via scan_controller.
#[tokio::test]
async fn az680_ac5_decline_forwards_to_scan_router() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();
    let surfaced = surfaced(120);
    h.bridge.surfaced_registry().record(surfaced.clone());

    // Act
    let ack = handle
        .dispatch_command(cmd(
            OperatorCommandKind::DeclinePoi,
            json!({ "poi_id": surfaced.poi_id.to_string() }),
        ))
        .await;

    // Assert
    assert_eq!(ack, CommandAck::Ok);
    let calls = h.scan.calls.lock().unwrap();
    assert_eq!(
        calls.len(),
        1,
        "DeclinePoi must reach scan_router exactly once"
    );
    assert!(matches!(calls[0].kind, OperatorCommandKind::DeclinePoi));
}

// ============================================================================
// AZ-681 ACs
// ============================================================================

/// AZ-681 AC-1 — BIT-DEGRADED ack succeeds.
#[tokio::test]
async fn az681_ac1_bit_degraded_ack_forwards() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();
    let report_id = Uuid::new_v4();
    h.severity.set(report_id, true);

    // Act
    let ack = handle
        .dispatch_command(cmd(
            OperatorCommandKind::AcknowledgeBitDegraded,
            json!({ "report_id": report_id.to_string(), "operator_id": "op1" }),
        ))
        .await;

    // Assert
    assert_eq!(ack, CommandAck::Ok);
    let acks = h.safety.bit_acks.lock().unwrap();
    assert_eq!(acks.len(), 1);
    assert_eq!(acks[0], (report_id, Some("op1".to_string())));
}

/// AZ-681 AC-2 — BIT-FAIL ack rejected.
#[tokio::test]
async fn az681_ac2_bit_fail_ack_rejected() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();
    let report_id = Uuid::new_v4();
    h.severity.set(report_id, false);

    // Act
    let ack = handle
        .dispatch_command(cmd(
            OperatorCommandKind::AcknowledgeBitDegraded,
            json!({ "report_id": report_id.to_string(), "operator_id": "op1" }),
        ))
        .await;

    // Assert
    assert_eq!(ack.reason(), Some(ack_reasons::CANNOT_ACKNOWLEDGE_FAIL));
    assert!(
        h.safety.bit_acks.lock().unwrap().is_empty(),
        "safety_router must not be invoked on Fail report"
    );
}

/// AZ-681 AC-3 — Safety-override forwards with scope + duration, and
/// an audit entry is written.
#[tokio::test]
async fn az681_ac3_safety_override_forwards_with_audit_entry() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();

    // Act
    let ack = handle
        .dispatch_command(cmd(
            OperatorCommandKind::SafetyOverride,
            json!({
                "scope": "battery_rtl",
                "duration_secs": 60,
                "operator_id": "op1",
                "rationale": "post-mission RTL too aggressive"
            }),
        ))
        .await;

    // Assert — router invoked with the right scope + duration.
    assert_eq!(ack, CommandAck::Ok);
    let overrides = h.safety.overrides.lock().unwrap();
    assert_eq!(overrides.len(), 1);
    assert_eq!(overrides[0].0, SafetyOverrideScope::BatteryRtl);
    assert_eq!(overrides[0].1, 60);
    assert_eq!(overrides[0].2, "op1");

    // Assert — audit log has exactly one safety-override entry.
    let entries = h.audit.entries.lock();
    let safety_entries: Vec<_> = entries
        .iter()
        .filter(|e| matches!(e, AuditEntry::SafetyOverride { .. }))
        .collect();
    assert_eq!(safety_entries.len(), 1);
    match safety_entries[0] {
        AuditEntry::SafetyOverride {
            scope,
            duration_secs,
            operator_id,
            outcome,
            ..
        } => {
            assert_eq!(*scope, SafetyOverrideScope::BatteryRtl);
            assert_eq!(*duration_secs, 60);
            assert_eq!(operator_id.as_deref(), Some("op1"));
            assert_eq!(outcome, &CommandAck::Ok);
        }
        _ => unreachable!(),
    }
}

/// AZ-681 AC-4 — Audit log redacts secrets.
#[tokio::test]
async fn az681_ac4_audit_log_contains_no_signature_or_session_token() {
    // Arrange
    let h = harness();
    let handle = h.bridge.handle();

    // Act
    let _ = handle
        .dispatch_command(cmd(
            OperatorCommandKind::SafetyOverride,
            json!({
                "scope": "battery_rtl",
                "duration_secs": 30,
                "operator_id": "op1",
                "rationale": "test"
            }),
        ))
        .await;

    // Assert — every audit entry serialised to JSON must omit
    // `signature` and `session_token`.
    let entries = h.audit.entries.lock();
    assert!(!entries.is_empty());
    for entry in entries.iter() {
        let json = serde_json::to_string(entry).expect("serialises");
        assert!(
            !json.contains("signature"),
            "audit entry leaked signature: {json}"
        );
        assert!(
            !json.contains("session_token"),
            "audit entry leaked session_token: {json}"
        );
    }
}