"""Phase 6 tests — Living Taxonomy: detector + transient-to-durable extension."""

from __future__ import annotations

from datetime import datetime, timedelta, timezone

import pytest

from atocore.memory.service import (
    create_memory,
    extend_reinforced_valid_until,
)
from atocore.models.database import get_connection, init_db


def _set_memory_fields(mem_id, reference_count=None, valid_until=None):
    """Helper to force memory state for tests."""
    with get_connection() as conn:
        fields, params = [], []
        if reference_count is not None:
            fields.append("reference_count = ?")
            params.append(reference_count)
        if valid_until is not None:
            fields.append("valid_until = ?")
            params.append(valid_until)
        params.append(mem_id)
        conn.execute(
            f"UPDATE memories SET {', '.join(fields)} WHERE id = ?",
            params,
        )


# --- Transient-to-durable extension (C.3) ---


def test_extend_extends_imminent_valid_until(tmp_data_dir):
    init_db()
    mem = create_memory("knowledge", "Reinforced content for extension")
    soon = (datetime.now(timezone.utc) + timedelta(days=7)).strftime("%Y-%m-%d")
    _set_memory_fields(mem.id, reference_count=6, valid_until=soon)

    result = extend_reinforced_valid_until()
    assert len(result) == 1
    assert result[0]["memory_id"] == mem.id
    assert result[0]["action"] == "extended"
    # New expiry should be ~90 days out
    new_date = datetime.strptime(result[0]["new_valid_until"], "%Y-%m-%d")
    days_out = (new_date - datetime.now(timezone.utc).replace(tzinfo=None)).days
    assert 85 <= days_out <= 92  # ~90 days, some slop for test timing


def test_extend_makes_permanent_at_high_reference_count(tmp_data_dir):
    init_db()
    mem = create_memory("knowledge", "Heavy-referenced content")
    soon = (datetime.now(timezone.utc) + timedelta(days=7)).strftime("%Y-%m-%d")
    _set_memory_fields(mem.id, reference_count=15, valid_until=soon)

    result = extend_reinforced_valid_until()
    assert len(result) == 1
    assert result[0]["action"] == "made_permanent"
    assert result[0]["new_valid_until"] is None

    # Verify the DB reflects the cleared expiry
    with get_connection() as conn:
        row = conn.execute(
            "SELECT valid_until FROM memories WHERE id = ?", (mem.id,)
        ).fetchone()
    assert row["valid_until"] is None


def test_extend_skips_not_expiring_soon(tmp_data_dir):
    init_db()
    mem = create_memory("knowledge", "Far-future expiry")
    far = (datetime.now(timezone.utc) + timedelta(days=365)).strftime("%Y-%m-%d")
    _set_memory_fields(mem.id, reference_count=6, valid_until=far)

    result = extend_reinforced_valid_until(imminent_expiry_days=30)
    assert result == []


def test_extend_skips_low_reference_count(tmp_data_dir):
    init_db()
    mem = create_memory("knowledge", "Not reinforced enough")
    soon = (datetime.now(timezone.utc) + timedelta(days=7)).strftime("%Y-%m-%d")
    _set_memory_fields(mem.id, reference_count=2, valid_until=soon)

    result = extend_reinforced_valid_until(min_reference_count=5)
    assert result == []


def test_extend_skips_permanent_memory(tmp_data_dir):
    """Memory with no valid_until is already permanent — shouldn't touch."""
    init_db()
    mem = create_memory("knowledge", "Already permanent")
    _set_memory_fields(mem.id, reference_count=20)
    # no valid_until

    result = extend_reinforced_valid_until()
    assert result == []


def test_extend_writes_audit_row(tmp_data_dir):
    init_db()
    mem = create_memory("knowledge", "Audited extension")
    soon = (datetime.now(timezone.utc) + timedelta(days=7)).strftime("%Y-%m-%d")
    _set_memory_fields(mem.id, reference_count=6, valid_until=soon)

    extend_reinforced_valid_until()

    from atocore.memory.service import get_memory_audit
    audit = get_memory_audit(mem.id)
    actions = [a["action"] for a in audit]
    assert "valid_until_extended" in actions
    entry = next(a for a in audit if a["action"] == "valid_until_extended")
    assert entry["actor"] == "transient-to-durable"


# --- Emerging detector (smoke tests — detector runs against live DB state
#     so we test the shape of results rather than full integration here) ---


def test_detector_imports_cleanly():
    """Detector module must import without errors (it's called from nightly cron)."""
    import importlib.util
    import sys
    from pathlib import Path

    # Load the detector script as a module
    script = Path(__file__).resolve().parent.parent / "scripts" / "detect_emerging.py"
    assert script.exists()
    spec = importlib.util.spec_from_file_location("detect_emerging", script)
    mod = importlib.util.module_from_spec(spec)
    # Don't actually run main() — just verify it parses and defines expected names
    spec.loader.exec_module(mod)
    assert hasattr(mod, "main")
    assert hasattr(mod, "PROJECT_MIN_MEMORIES")
    assert hasattr(mod, "PROJECT_ALERT_THRESHOLD")


def test_detector_handles_empty_db(tmp_data_dir):
    """Detector should handle zero memories without crashing."""
    init_db()
    # Don't create any memories. Just verify the queries work via the service layer.
    from atocore.memory.service import get_memories
    active = get_memories(active_only=True, limit=500)
    candidates = get_memories(status="candidate", limit=500)
    assert active == []
    assert candidates == []