"""Plan 03-02 Task 2 Step 8: live integration test (catches false-GREEN trap).

The trap: if M2/M4/M6 unit tests SEED their own retrieval_used / profile_updated
/ session_started events, they will pass even when production code emits
NOTHING -- so M2/M4/M6 are stuck at 0.0 in real use.

This test runs the REAL production paths:
- retrieve.recall (real cosine recall) -> must produce kind='retrieval_used'
- profile.profile_set(store=store) (real set on a live knob) -> must produce
  kind='profile_updated'
- session.assemble_session_start (real session start) -> must produce
  kind='session_started'

Then asserts the live M2/M4/M6 helpers can READ those production-emitted events
and return non-zero values.
"""
from __future__ import annotations

from uuid import uuid4

import pytest

from iai_mcp import profile, retrieve
from iai_mcp.events import query_events
from iai_mcp.store import MemoryStore
from iai_mcp.trajectory import (
    m2_precision_at_5_live,
    m4_profile_variance_live,
    m6_context_repeat_rate_live,
)
from iai_mcp.types import EMBED_DIM, MemoryRecord


def _make_record(literal: str, *, lang: str = "en") -> MemoryRecord:
    """Build a minimal MemoryRecord -- mirrors test_retrieve.py-style fixtures."""
    from datetime import datetime, timezone
    now = datetime.now(timezone.utc)
    return MemoryRecord(
        id=uuid4(),
        tier="episodic",
        literal_surface=literal,
        aaak_index="",
        embedding=[0.5] * EMBED_DIM,
        community_id=None,
        centrality=0.0,
        detail_level=2,
        pinned=False,
        stability=0.0,
        difficulty=0.0,
        last_reviewed=None,
        never_decay=False,
        never_merge=False,
        provenance=[],
        created_at=now,
        updated_at=now,
        tags=[],
        language=lang,
    )


def test_real_recall_emits_retrieval_used_and_m2_lifts_off_zero(tmp_path):
    """The false-GREEN trap killer for M2.

    A real `retrieve.recall` must emit kind='retrieval_used' so M2 can
    measure precision@5 from production events, not just seeded ones.
    """
    store = MemoryStore(path=tmp_path)
    # Seed a few records so cosine recall has something to return.
    for i in range(3):
        store.insert(_make_record(f"hello world {i}"))

    cue_emb = [0.5] * EMBED_DIM
    resp = retrieve.recall(
        store=store,
        cue_embedding=cue_emb,
        cue_text="hello",
        session_id="integration-1",
    )
    assert len(resp.hits) > 0  # cosine returns at least one of the seeds

    events = query_events(store, kind="retrieval_used", limit=20)
    assert events, (
        "FALSE-GREEN GUARD: retrieve.recall must emit kind='retrieval_used' "
        "in production for M2 to be live; no events found means M2 always "
        "returns 0.0 in real use."
    )

    m2_val = m2_precision_at_5_live(store)
    assert m2_val > 0.0, (
        f"M2 must return >0 when retrieval_used events exist; got {m2_val}"
    )


def test_real_profile_set_emits_profile_updated_and_m4_lifts_off_zero(tmp_path):
    """The false-GREEN trap killer for M4."""
    store = MemoryStore(path=tmp_path)
    state = profile.default_state()

    # Two distinct value changes on a live numeric knob.
    profile.profile_set("interest_boost", 0.3, state, store=store)
    profile.profile_set("interest_boost", 0.7, state, store=store)

    events = query_events(store, kind="profile_updated", limit=20)
    assert events, (
        "FALSE-GREEN GUARD: profile.profile_set(store=store) must emit "
        "kind='profile_updated' for M4 to be live."
    )
    # The variance over two values [0.3, 0.7] is non-zero.
    m4_val = m4_profile_variance_live(store)
    assert m4_val > 0.0, f"M4 must return >0 with non-trivial profile diffs; got {m4_val}"


def test_profile_set_no_op_does_not_emit(tmp_path):
    """No-op writes (old == new) must NOT emit profile_updated -- avoid flood."""
    store = MemoryStore(path=tmp_path)
    state = profile.default_state()
    # Set, then re-set to the same value.
    profile.profile_set("interest_boost", 0.5, state, store=store)
    before = len(query_events(store, kind="profile_updated", limit=100))
    profile.profile_set("interest_boost", 0.5, state, store=store)
    after = len(query_events(store, kind="profile_updated", limit=100))
    assert after == before, "no-op profile_set must not emit"


def test_real_session_start_emits_session_started_and_m6_lifts_off_zero(tmp_path):
    """The false-GREEN trap killer for M6.

    Two consecutive session-start assemblies on the SAME store must produce
    matching session_state_hash values -> M6 sees a 0.5 repeat rate.
    """
    from iai_mcp.session import assemble_session_start

    store = MemoryStore(path=tmp_path)
    store.insert(_make_record("seed"))

    _graph, assignment, rc = retrieve.build_runtime_graph(store)
    assemble_session_start(store, assignment, rc, session_id="sess-A")
    assemble_session_start(store, assignment, rc, session_id="sess-B")

    events = query_events(store, kind="session_started", limit=20)
    assert len(events) >= 2, (
        "FALSE-GREEN GUARD: assemble_session_start must emit "
        "kind='session_started' for M6 to be live."
    )
    # Both assemblies hashed an identical store; M6 should see 0.5 repeat
    # rate ((2 - 1) / 2).
    m6_val = m6_context_repeat_rate_live(store)
    assert m6_val == pytest.approx(0.5, abs=1e-6), (
        f"two identical session starts must give M6 = 0.5; got {m6_val}"
    )