"""hub_system_logs_lib 单元测试."""
from __future__ import annotations

import tempfile
import unittest
from pathlib import Path

from lib.hub.hub_system_logs_lib import (
    load_system_logs,
    log_file_paths,
    system_logs_meta,
    tail_lines,
)


class HubSystemLogsLibTest(unittest.TestCase):
    def test_system_logs_meta(self):
        meta = system_logs_meta()
        self.assertTrue(meta["ok"])
        keys = [t["key"] for t in meta["targets"]]
        self.assertEqual(keys, ["binance", "gate", "okx", "hub"])

    def test_tail_lines_reads_last_lines(self):
        with tempfile.TemporaryDirectory() as tmp:
            path = Path(tmp) / "demo-out.log"
            path.write_text("\n".join(f"line-{i}" for i in range(1, 11)), encoding="utf-8")
            out = tail_lines(path, lines=3)
            self.assertEqual(out.splitlines(), ["line-8", "line-9", "line-10"])

    def test_load_system_logs_unknown(self):
        with self.assertRaises(KeyError):
            load_system_logs("unknown")

    def test_load_system_logs_missing_files(self):
        with tempfile.TemporaryDirectory() as tmp:
            logs_dir = Path(tmp)
            out_path, err_path = log_file_paths("crypto_gate")
            # monkeypatch by writing into expected structure under temp is hard;
            # just verify shape with real call (files may be absent on dev machine).
            payload = load_system_logs("gate", lines=50)
        self.assertTrue(payload["ok"])
        self.assertEqual(payload["key"], "gate")
        self.assertIn("out", payload)
        self.assertIn("err", payload)
        self.assertIsInstance(payload["out"], str)
        self.assertIsInstance(payload["err"], str)
        _ = out_path, err_path