"""Tests for _log_order_error_history — permanent audit trail."""
import os
import sys
import logging
import logging.handlers
import pytest

sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))

from app.services import sqlite_service


@pytest.fixture
def reset_logger(tmp_path, monkeypatch):
    """Redirect error history log into tmp_path for isolation."""
    sqlite_service._error_history_logger = None
    lg = logging.getLogger("sync_errors_history")
    for h in list(lg.handlers):
        lg.removeHandler(h)
    logs_dir = tmp_path / "logs"
    logs_dir.mkdir()
    target = logs_dir / "sync_errors_history.log"

    def fake_get_logger():
        if sqlite_service._error_history_logger is not None:
            return sqlite_service._error_history_logger
        inner = logging.getLogger("sync_errors_history")
        inner.setLevel(logging.INFO)
        inner.propagate = False
        handler = logging.handlers.RotatingFileHandler(
            str(target), maxBytes=100 * 1024 * 1024, backupCount=12, encoding="utf-8"
        )
        handler.setFormatter(logging.Formatter("%(asctime)s %(message)s"))
        inner.addHandler(handler)
        sqlite_service._error_history_logger = inner
        return inner

    monkeypatch.setattr(sqlite_service, "_get_error_history_logger", fake_get_logger)
    yield target
    sqlite_service._error_history_logger = None
    lg = logging.getLogger("sync_errors_history")
    for h in list(lg.handlers):
        h.close()
        lg.removeHandler(h)


@pytest.mark.unit
def test_log_order_error_history_writes_line(reset_logger):
    sqlite_service._log_order_error_history("485224762", "UNIQUE constraint failed")
    logging.shutdown()
    content = reset_logger.read_text(encoding="utf-8")
    assert "ORDER_FAIL 485224762" in content
    assert "UNIQUE constraint failed" in content


@pytest.mark.unit
def test_log_order_error_history_appends(reset_logger):
    sqlite_service._log_order_error_history("1", "err-a")
    sqlite_service._log_order_error_history("2", "err-b")
    sqlite_service._log_order_error_history("2", "err-b-retry")
    logging.shutdown()
    content = reset_logger.read_text(encoding="utf-8")
    assert "ORDER_FAIL 1: err-a" in content
    assert "ORDER_FAIL 2: err-b" in content
    # Two entries for order 2 — append-only guarantee
    assert content.count("ORDER_FAIL 2:") == 2


@pytest.mark.unit
def test_log_order_error_history_swallows_errors(monkeypatch):
    """Callable must never raise — caller is already in a degraded path."""
    def boom():
        raise RuntimeError("disk full")
    monkeypatch.setattr(sqlite_service, "_get_error_history_logger", boom)
    sqlite_service._log_order_error_history("X", "ignored")