from __future__ import annotations

import importlib.util
import sys
import unittest
from pathlib import Path


SCRIPT_PATH = Path(__file__).resolve().parents[3] / "scripts" / "generate_monitoring.py"
SPEC = importlib.util.spec_from_file_location("generate_monitoring", SCRIPT_PATH)
generate_monitoring = importlib.util.module_from_spec(SPEC)
assert SPEC and SPEC.loader
sys.dont_write_bytecode = True
SPEC.loader.exec_module(generate_monitoring)


def targets_payload(down_jobs: set[str] | None = None, missing_jobs: set[str] | None = None):
    down_jobs = down_jobs or set()
    missing_jobs = missing_jobs or set()

    active_targets = []
    for job in generate_monitoring.EXPECTED_JOBS:
        if job in missing_jobs:
            continue
        active_targets.append(
            {
                "labels": {"job": job, "instance": f"{job}:1"},
                "health": "down" if job in down_jobs else "up",
            }
        )

    return {"activeTargets": active_targets}


class GenerateMonitoringStabilizationTest(unittest.TestCase):
    def test_stabilized_report_uses_later_clean_target_snapshot(self):
        snapshots = [
            targets_payload(down_jobs={"awoooi-api"}),
            targets_payload(),
        ]

        def fetch_targets():
            return snapshots.pop(0)

        report = generate_monitoring.build_stabilized_report(
            fetch_targets,
            attempts=3,
            sleep_seconds=0,
            emit_status=False,
        )

        self.assertEqual(report["summary"]["real_down_jobs"], 0)
        self.assertEqual(report["stabilization"]["attempt"], 2)
        self.assertEqual(report["stabilization"]["status"], "cleared")

    def test_stabilized_report_retries_missing_expected_target(self):
        snapshots = [
            targets_payload(missing_jobs={"awoooi-api"}),
            targets_payload(),
        ]

        def fetch_targets():
            return snapshots.pop(0)

        report = generate_monitoring.build_stabilized_report(
            fetch_targets,
            attempts=3,
            sleep_seconds=0,
            emit_status=False,
        )

        self.assertEqual(report["missing_expected"], [])
        self.assertEqual(report["stabilization"]["attempt"], 2)
        self.assertEqual(report["stabilization"]["status"], "cleared")

    def test_stabilized_report_keeps_real_down_after_attempts_exhausted(self):
        def fetch_targets():
            return targets_payload(down_jobs={"awoooi-api"})

        report = generate_monitoring.build_stabilized_report(
            fetch_targets,
            attempts=2,
            sleep_seconds=0,
            emit_status=False,
        )

        self.assertEqual(report["summary"]["real_down_jobs"], 1)
        self.assertEqual(report["real_down_jobs"], ["awoooi-api"])
        self.assertEqual(report["stabilization"]["status"], "failed")

    def test_stabilized_report_does_not_retry_clean_snapshot(self):
        calls = 0

        def fetch_targets():
            nonlocal calls
            calls += 1
            return targets_payload()

        report = generate_monitoring.build_stabilized_report(
            fetch_targets,
            attempts=3,
            sleep_seconds=0,
            emit_status=False,
        )

        self.assertEqual(calls, 1)
        self.assertEqual(report["stabilization"]["status"], "stable")


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