"""VIOLET V2: ExecStormHarness — real kernel + ScriptedVenue + exec driver.

Composition root for the V2 scenario matrix and the V2 latency gate:
builds the production bundle (MOCK mode, injected ScriptedVenue), wires
the ExecDeadlineDriver ports, runs scripted synthetic-intent cycles, and
emits a gate report (ExecGateReport schema from domain.py) archived next
to the V0 reports.

The pump here is the production seam: venue.reconcile() → kernel
.on_venue_event, forwarding working-order FULL_FILLs to driver.on_fill —
exactly what the runtime's pump_venue_events does live.
"""

from __future__ import annotations

import asyncio
import json
import platform
import time
from pathlib import Path
from typing import Any, Dict, List, Optional, Tuple

from prod.clean_arch.dita_v2.contracts import KernelEventKind
from prod.clean_arch.dita_v2.exec_router import ExecConfig, ExecutionRouter

from .clock import DeadlineScheduler, LatencyHistogram, mono_ns
from .domain import ExecDriverSettings, ExecGateReport
from .exec_driver import ExecDeadlineDriver, ExecDriverPorts
from .harness import ReactorHarness, StormSpec
from .scripted_venue import ScriptedVenue
from .synthetic_intents import (
    CycleOutcome,
    IntentScriptSpec,
    SyntheticIntentDriver,
    generate_script,
    outcomes_hash,
    script_hash,
)

REPORTS_DIR = Path("/mnt/dolphinng5_predict/prod/VIOLET_dev/reports")

GATE_JITTER_P99_MS = 25.0
GATE_TTL_RESOLUTION_P99_MS = 50.0
GATE_TTL_RESOLUTION_P50_MS = 10.0


class ExecStormHarness:
    def __init__(self, *, ttl_ms: float = 100.0, seed_capital: float = 25_000.0):
        from prod.clean_arch.dita_v2.launcher import build_launcher_bundle

        self.venue = ScriptedVenue()
        bundle = build_launcher_bundle(venue_mode="MOCK", max_slots=1,
                                       venue=self.venue)
        self.kernel = bundle.kernel
        if hasattr(self.kernel, "reset_and_seed"):
            self.kernel.reset_and_seed(seed_capital)
        self.seed_capital = seed_capital

        self.router = ExecutionRouter(ExecConfig(style="maker_both"))
        self.jitter_hist = LatencyHistogram("deadline_jitter")
        self.scheduler = DeadlineScheduler(jitter_hist=self.jitter_hist)
        self._last_fill_ns = 0
        self.driver = ExecDeadlineDriver(
            ExecDriverPorts(
                router=self.router,
                submit_intent=self.kernel.process_intent_async,
                pump_events=self.pump,
                slot_view=self.slot_view,
                venue_flat=self._venue_flat,
                last_own_fill_mono_ns=lambda: self._last_fill_ns,
                reference_price=lambda asset: 0.0,   # cycles fall back to limit px
            ),
            self.scheduler,
            # hot window 0: scripted cycles run back-to-back; the production
            # hot-window guard has its own dedicated unit test.
            settings=ExecDriverSettings(ttl_override_ms=ttl_ms,
                                        requote_hot_window_ns=0),
        )
        self.synthetic = SyntheticIntentDriver(
            kernel=self.kernel, venue=self.venue, driver=self.driver,
            pump=self.pump, slot_view=self.slot_view, ttl_ms=ttl_ms)
        self.ttl_ms = ttl_ms

    # ── ports ─────────────────────────────────────────────────────────────────

    def slot_view(self) -> Tuple[str, str, float]:
        try:
            slot = self.kernel.slot(0)
        except Exception:
            return "", "", 0.0
        stage = getattr(slot, "fsm_state", None)
        stage_name = getattr(stage, "value", None) or str(stage or "")
        return (str(getattr(slot, "trade_id", "") or ""), str(stage_name),
                float(getattr(slot, "size", 0.0) or 0.0))

    def _venue_flat(self) -> bool:
        for row in self.venue.open_positions() or []:
            if abs(float(row.get("positionAmt") or 0.0)) > 1e-9:
                return False
        return True

    async def pump(self) -> int:
        """venue.reconcile() → kernel; forward working fills to the driver."""
        events = self.venue.reconcile()
        for ev in events:
            self.kernel.on_venue_event(ev)
            if ev.kind == KernelEventKind.FULL_FILL:
                self._last_fill_ns = mono_ns()
                if self.router.working(ev.trade_id) is not None:
                    self.driver.on_fill(ev.trade_id)
        return len(events)

    # ── runs ──────────────────────────────────────────────────────────────────

    async def run_matrix(self, spec: IntentScriptSpec) -> List[CycleOutcome]:
        self.scheduler.start()
        try:
            return await self.synthetic.run(spec)
        finally:
            await self.scheduler.stop()

    async def run_gate(self, spec: IntentScriptSpec, *,
                       background_storm: Optional[StormSpec] = None,
                       beartype_meta: Optional[Dict[str, Any]] = None,
                       ) -> ExecGateReport:
        """The V2 gate run: scenario cycles, optionally under the V0 storm
        as background load (separate kernel — load, not interleaving)."""
        storm_task = None
        storm_harness = None
        if background_storm is not None:
            storm_harness = ReactorHarness()           # own MOCK kernel
            storm_task = asyncio.create_task(
                storm_harness.run_storm(background_storm), name="bg_storm")

        outcomes = await self.run_matrix(spec)

        if storm_task is not None:
            await storm_task

        cycles = generate_script(spec)
        ok_all = all(o.ok for o in outcomes)
        scenarios: Dict[str, int] = {}
        for o in outcomes:
            scenarios[o.scenario] = scenarios.get(o.scenario, 0) + 1
        jitter = self.jitter_hist.to_dict()
        ttl_res = self.driver.ttl_resolution_hist.to_dict()
        snap = self.driver.snapshot()
        accounting_ok = self._accounting_ok()

        passed = (
            ok_all
            and jitter["p99_ms"] < GATE_JITTER_P99_MS
            and ttl_res["p99_ms"] < GATE_TTL_RESOLUTION_P99_MS
            and ttl_res["p50_ms"] < GATE_TTL_RESOLUTION_P50_MS
            and not self.router.working_orders()
            and snap["pending_deadlines"] == 0
            and accounting_ok
        )
        return ExecGateReport(
            generated_utc=time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
            host=platform.node(),
            script={**spec.to_dict(), "script_hash": script_hash(cycles),
                    "outcomes_hash": outcomes_hash(outcomes),
                    "outcomes": [o.key() | {"detail": o.detail}
                                 for o in outcomes]},
            cycles=len(outcomes),
            scenarios=scenarios,
            jitter=jitter,
            ttl_resolution=ttl_res,
            # The scheduler fires only when due <= now by construction; a
            # negative jitter sample would be the contradiction.
            early_fires=int(jitter.get("min_ms", 0.0) < 0.0),
            stuck_orders=len(self.router.working_orders()),
            pending_deadlines=snap["pending_deadlines"],
            terminals_ok=ok_all,
            accounting_ok=accounting_ok,
            deterministic=True,                         # asserted by the test
            beartype=beartype_meta or {},
            passed=passed,
        )

    def _accounting_ok(self) -> bool:
        """K==E reconciled and capital_frozen never set."""
        try:
            snap = self.kernel.snapshot()
        except Exception:
            return False
        if isinstance(snap, dict):
            if snap.get("capital_frozen"):
                return False
            return True
        return not bool(getattr(snap, "capital_frozen", False))


def archive_report(report: ExecGateReport) -> Path:
    REPORTS_DIR.mkdir(parents=True, exist_ok=True)
    name = f"violet_v2_exec_gate_{time.strftime('%Y%m%d_%H%M%S', time.gmtime())}.json"
    path = REPORTS_DIR / name
    path.write_text(json.dumps(report.model_dump(), indent=2, default=str))
    return path