"""
Tests for scripts/config_drift.py — Config drift detection.
"""

import json
import tempfile
import unittest
from pathlib import Path

import sys
sys.path.insert(0, str(Path(__file__).parent.parent / "scripts"))
from config_drift import (
    get_nested_value,
    compare_configs,
    parse_yaml_basic,
    generate_report,
)


class TestGetNestedValue(unittest.TestCase):
    def test_top_level(self):
        config = {"provider": "openrouter"}
        self.assertEqual(get_nested_value(config, "provider"), "openrouter")

    def test_nested(self):
        config = {"cron": {"enabled": True, "workers": 4}}
        self.assertEqual(get_nested_value(config, "cron.enabled"), True)
        self.assertEqual(get_nested_value(config, "cron.workers"), 4)

    def test_missing_key(self):
        config = {"provider": "openrouter"}
        self.assertIsNone(get_nested_value(config, "missing"))

    def test_missing_nested(self):
        config = {"cron": {}}
        self.assertIsNone(get_nested_value(config, "cron.enabled"))

    def test_deep_nesting(self):
        config = {"a": {"b": {"c": "value"}}}
        self.assertEqual(get_nested_value(config, "a.b.c"), "value")


class TestCompareConfigs(unittest.TestCase):
    def test_no_diff(self):
        canonical = {"provider": "openrouter", "model": "mimo"}
        remote = {"provider": "openrouter", "model": "mimo"}
        diffs = compare_configs(canonical, remote, ["provider", "model"])
        self.assertEqual(diffs, [])

    def test_single_diff(self):
        canonical = {"provider": "openrouter"}
        remote = {"provider": "anthropic"}
        diffs = compare_configs(canonical, remote, ["provider"])
        self.assertEqual(len(diffs), 1)
        self.assertEqual(diffs[0][0], "provider")
        self.assertEqual(diffs[0][1], "openrouter")
        self.assertEqual(diffs[0][2], "anthropic")

    def test_multiple_diffs(self):
        canonical = {"provider": "openrouter", "model": "mimo"}
        remote = {"provider": "anthropic", "model": "claude"}
        diffs = compare_configs(canonical, remote, ["provider", "model"])
        self.assertEqual(len(diffs), 2)

    def test_nested_diff(self):
        canonical = {"cron": {"enabled": True}}
        remote = {"cron": {"enabled": False}}
        diffs = compare_configs(canonical, remote, ["cron.enabled"])
        self.assertEqual(len(diffs), 1)
        self.assertEqual(diffs[0][0], "cron.enabled")

    def test_missing_in_remote(self):
        canonical = {"provider": "openrouter"}
        remote = {}
        diffs = compare_configs(canonical, remote, ["provider"])
        self.assertEqual(len(diffs), 1)

    def test_extra_in_remote(self):
        canonical = {}
        remote = {"provider": "openrouter"}
        diffs = compare_configs(canonical, remote, ["provider"])
        self.assertEqual(len(diffs), 1)


class TestParseYamlBasic(unittest.TestCase):
    def test_simple(self):
        content = "provider: openrouter\nmodel: mimo-v2-pro\n"
        result = parse_yaml_basic(content)
        self.assertEqual(result["provider"], "openrouter")
        self.assertEqual(result["model"], "mimo-v2-pro")

    def test_boolean(self):
        content = "enabled: true\ndisabled: false\n"
        result = parse_yaml_basic(content)
        self.assertEqual(result["enabled"], True)
        self.assertEqual(result["disabled"], False)

    def test_integer(self):
        content = "workers: 4\nport: 8080\n"
        result = parse_yaml_basic(content)
        self.assertEqual(result["workers"], 4)
        self.assertEqual(result["port"], 8080)

    def test_comments_skipped(self):
        content = "# This is a comment\nprovider: openrouter\n"
        result = parse_yaml_basic(content)
        self.assertNotIn("#", result)
        self.assertEqual(result["provider"], "openrouter")

    def test_quoted_values(self):
        content = 'name: "hello world"\nother: \'single quotes\'\n'
        result = parse_yaml_basic(content)
        self.assertEqual(result["name"], "hello world")
        self.assertEqual(result["other"], "single quotes")


class TestGenerateReport(unittest.TestCase):
    def test_all_ok(self):
        results = {
            "node1": {"status": "ok", "diffs": []},
            "node2": {"status": "ok", "diffs": []},
        }
        report = generate_report(results, ["provider"])
        self.assertIn("OK", report)
        self.assertIn("2 ok", report)

    def test_drift_reported(self):
        results = {
            "node1": {
                "status": "drift",
                "diffs": [("provider", "openrouter", "anthropic")]
            },
            "node2": {"status": "ok", "diffs": []},
        }
        report = generate_report(results, ["provider"])
        self.assertIn("DRIFT DETECTED", report)
        self.assertIn("openrouter", report)
        self.assertIn("anthropic", report)

    def test_unreachable_reported(self):
        results = {
            "node1": {"status": "unreachable", "diffs": []},
        }
        report = generate_report(results, ["provider"])
        self.assertIn("UNREACHABLE", report)


if __name__ == "__main__":
    unittest.main()