from __future__ import annotations

import logging

import pytest
from cerbero_mcp.common import audit as audit_mod
from cerbero_mcp.common.audit import audit_write_op


@pytest.fixture
def captured_records(monkeypatch):
    """Cattura i record emessi dal logger mcp.audit (propagate=False blocca caplog).

    Sostituisce il logger del modulo con uno che ha caplog attaccato.
    """
    records: list[logging.LogRecord] = []

    class ListHandler(logging.Handler):
        def emit(self, record: logging.LogRecord) -> None:
            records.append(record)

    test_logger = logging.getLogger("mcp.audit.test")
    test_logger.handlers.clear()
    test_logger.addHandler(ListHandler())
    test_logger.setLevel(logging.DEBUG)
    test_logger.propagate = False
    monkeypatch.setattr(audit_mod, "_logger", test_logger)
    return records


def test_audit_write_op_emits_structured_record(captured_records):
    audit_write_op(
        actor="core",
        action="place_order",
        exchange="deribit",
        target="BTC-PERPETUAL",
        payload={"side": "buy", "amount": 10, "leverage": 3},
        result={"order_id": "abc", "state": "open"},
    )
    assert len(captured_records) == 1
    rec = captured_records[0]
    assert rec.action == "place_order"
    assert rec.exchange == "deribit"
    assert rec.target == "BTC-PERPETUAL"
    assert rec.actor == "core"
    assert rec.payload == {"side": "buy", "amount": 10, "leverage": 3}
    assert rec.result == {"order_id": "abc", "state": "open"}


def test_audit_write_op_error_uses_error_level(captured_records):
    audit_write_op(
        actor="core",
        action="cancel_order",
        exchange="bybit",
        target="ord-123",
        payload={},
        error="not_found",
    )
    assert len(captured_records) == 1
    rec = captured_records[0]
    assert rec.levelname == "ERROR"
    assert rec.error == "not_found"


def test_audit_write_op_summarizes_result_fields(captured_records):
    big_result = {
        "order_id": "ord-1",
        "state": "submitted",
        "extra_huge_field": "x" * 10000,
        "orders": [{"id": 1}, {"id": 2}, {"id": 3}],
    }
    audit_write_op(
        actor="core",
        action="place_combo_order",
        exchange="bybit",
        payload={},
        result=big_result,
    )
    rec = captured_records[0]
    assert "extra_huge_field" not in rec.result
    assert rec.result["order_id"] == "ord-1"
    assert rec.result["orders_count"] == 3


def test_audit_write_op_no_actor(captured_records):
    audit_write_op(
        actor=None,
        action="place_order",
        exchange="alpaca",
        payload={},
    )
    rec = captured_records[0]
    assert rec.actor is None


def test_audit_write_op_writes_to_file_when_AUDIT_LOG_FILE_set(tmp_path, monkeypatch):
    """Con env AUDIT_LOG_FILE settato, una riga JSON appare nel file."""
    import json

    from cerbero_mcp.common import audit as audit_mod

    audit_file = tmp_path / "audit.jsonl"
    monkeypatch.setenv("AUDIT_LOG_FILE", str(audit_file))
    # Reset state idempotency flag così il test riesegue setup
    audit_mod._file_handler_attached = False
    # Pulisci handlers preesistenti dal logger (potrebbe avere file vecchio)
    for h in list(audit_mod._logger.handlers):
        from logging.handlers import TimedRotatingFileHandler
        if isinstance(h, TimedRotatingFileHandler):
            audit_mod._logger.removeHandler(h)

    audit_write_op(
        actor="core",
        action="place_order",
        exchange="bybit",
        target="BTCUSDT",
        payload={"side": "Buy", "qty": 0.01},
        result={"order_id": "abc123", "status": "submitted"},
    )

    # Forza flush dei file handler
    for h in audit_mod._logger.handlers:
        h.flush()

    assert audit_file.exists()
    content = audit_file.read_text().strip()
    assert content, "audit file empty"
    record = json.loads(content.splitlines()[-1])
    assert record["audit_event"] == "write_op"
    assert record["action"] == "place_order"
    assert record["exchange"] == "bybit"
    assert record["target"] == "BTCUSDT"
    assert record["actor"] == "core"


def test_audit_no_file_when_env_unset(tmp_path, monkeypatch):
    """Senza AUDIT_LOG_FILE, nessun file viene creato."""
    from cerbero_mcp.common import audit as audit_mod
    monkeypatch.delenv("AUDIT_LOG_FILE", raising=False)
    audit_mod._file_handler_attached = False

    audit_write_op(
        actor="core",
        action="cancel_order",
        exchange="bybit",
        target="ord-1",
        payload={},
    )
    # Niente file creato in tmp_path
    files = list(tmp_path.iterdir())
    assert files == []