from __future__ import annotations

import json
import tempfile
import unittest
from pathlib import Path

from cold_display_guard.main import restore_runtime_state


class RuntimeRestoreTests(unittest.TestCase):
    def test_restore_runtime_state_uses_stable_occupancy_when_raw_metrics_flicker(self) -> None:
        with tempfile.TemporaryDirectory() as tmpdir:
            diagnostics_path = Path(tmpdir) / "runtime_diagnostics.jsonl"
            diagnostics_path.write_text(
                json.dumps(
                    {
                        "ts": "2026-05-29T10:05:26+08:00",
                        "zone_counts": {"2": 1},
                        "diagnostics": {
                            "baseline_ready": True,
                            "zones": {
                                "2": {
                                    "baseline_mean_luma": 165.0,
                                    "baseline_texture": 16.0,
                                    "baseline_dark_fraction": 0.0,
                                    "baseline_bright_fraction": 0.0,
                                    "mean_delta": 17.077,
                                    "texture_delta": 8.819,
                                    "dark_fraction": 0.0357,
                                    "bright_fraction": 0.0,
                                    "raw_occupied": False,
                                    "occupied": True,
                                    "empty_streak": 1,
                                },
                            },
                        },
                    }
                ),
                encoding="utf-8",
            )

            _, zone_counts = restore_runtime_state(
                diagnostics_path,
                {
                    "runtime": {
                        "occupancy_mean_delta": 55.0,
                        "occupancy_texture_delta": 18.0,
                        "occupancy_dark_fraction": 0.06,
                        "occupancy_texture_dark_fraction": 0.04,
                    }
                },
            )

        self.assertEqual(zone_counts, {"2": 1})

    def test_restore_runtime_state_uses_dark_fraction_rules(self) -> None:
        with tempfile.TemporaryDirectory() as tmpdir:
            diagnostics_path = Path(tmpdir) / "runtime_diagnostics.jsonl"
            diagnostics_path.write_text(
                json.dumps(
                    {
                        "ts": "2026-05-29T10:00:00+08:00",
                        "zone_counts": {"1": 1, "4": 1},
                        "diagnostics": {
                            "baseline_ready": True,
                            "zones": {
                                "1": {
                                    "baseline_mean_luma": 165.0,
                                    "baseline_texture": 16.0,
                                    "baseline_dark_fraction": 0.0,
                                    "baseline_bright_fraction": 0.0,
                                    "mean_delta": 40.0,
                                    "texture_delta": 18.0,
                                    "dark_fraction": 0.10,
                                    "bright_fraction": 0.0,
                                },
                                "4": {
                                    "baseline_mean_luma": 177.0,
                                    "baseline_texture": 9.0,
                                    "baseline_dark_fraction": 0.0,
                                    "baseline_bright_fraction": 0.0,
                                    "mean_delta": 16.0,
                                    "texture_delta": 40.0,
                                    "dark_fraction": 0.0769,
                                    "bright_fraction": 0.3077,
                                },
                            },
                        },
                    }
                ),
                encoding="utf-8",
            )

            baselines, zone_counts = restore_runtime_state(
                diagnostics_path,
                {
                    "runtime": {
                        "occupancy_mean_delta": 55.0,
                        "occupancy_texture_delta": 18.0,
                        "occupancy_dark_fraction": 0.06,
                        "occupancy_texture_dark_fraction": 0.04,
                    }
                },
            )

        self.assertEqual(zone_counts, {"1": 1, "4": 0})
        self.assertEqual(baselines["1"].dark_fraction, 0.0)
        self.assertEqual(baselines["4"].bright_fraction, 0.0)


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