"""Tier 1 — Backend unit tests for Marionette.

Run without hardware, without daemon, in under 5 seconds.
Tests the HTTP API layer, state machine, data validation, and persistence.
"""

import json
from io import BytesIO
from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from marionette.main import (
    Marionette,
    _slugify,
    create_app,
    DEFAULT_DURATION,
    COUNTDOWN_SECONDS,
    MOTION_SAMPLE_RATE,
    DATASET_DATA_SUBDIR,
)


# ──────── Utility function tests ──────────────────────────────────────


class TestSlugify:
    def test_simple_lowercase(self):
        assert _slugify("Hello World") == "hello-world"

    def test_special_chars(self):
        assert _slugify("my@move#1!") == "my-move-1"

    def test_leading_trailing_hyphens(self):
        assert _slugify("---test---") == "test"

    def test_empty_string(self):
        assert _slugify("") == "take"

    def test_unicode(self):
        result = _slugify("café résumé")
        assert result == "caf-r-sum"

    def test_already_slugified(self):
        assert _slugify("gentle-nod") == "gentle-nod"

    def test_numbers(self):
        assert _slugify("take 42") == "take-42"


# ──────── State endpoint tests ────────────────────────────────────────


class TestStateEndpoint:
    def test_returns_200(self, client: TestClient):
        resp = client.get("/api/state")
        assert resp.status_code == 200

    def test_initial_mode_is_idle(self, client: TestClient):
        data = client.get("/api/state").json()
        assert data["mode"] == "idle"

    def test_initial_message(self, client: TestClient):
        data = client.get("/api/state").json()
        assert data["message"] == "Ready to capture moves"

    def test_state_shape(self, client: TestClient):
        data = client.get("/api/state").json()
        required_keys = {
            "server_time", "mode", "message", "active_move",
            "phase_start_at", "phase_end_at",
            "countdown_ends_at",
            "recording_started_at", "recording_duration", "recording_stats",
            "pending_recording", "pending_playback",
            "moves", "config", "datasets",
        }
        assert required_keys.issubset(data.keys())

    def test_server_time_present(self, client: TestClient):
        import time
        data = client.get("/api/state").json()
        assert isinstance(data["server_time"], float)
        # Should be close to current time (within 5 seconds)
        assert abs(data["server_time"] - time.time()) < 5.0

    def test_idle_phase_timing_null(self, client: TestClient):
        data = client.get("/api/state").json()
        assert data["phase_start_at"] is None
        assert data["phase_end_at"] is None

    def test_config_shape(self, client: TestClient):
        config = client.get("/api/state").json()["config"]
        assert config["default_duration"] == DEFAULT_DURATION
        assert config["countdown_seconds"] == COUNTDOWN_SECONDS
        assert config["motion_sample_rate"] == MOTION_SAMPLE_RATE
        assert isinstance(config["audio_available"], bool)
        assert isinstance(config["features"], dict)

    def test_initial_moves_empty(self, client: TestClient):
        data = client.get("/api/state").json()
        assert data["moves"] == []

    def test_initial_no_pending(self, client: TestClient):
        data = client.get("/api/state").json()
        assert data["pending_recording"] is None
        assert data["pending_playback"] is None


# ──────── Recording endpoint tests ────────────────────────────────────


class TestRecordEndpoint:
    def test_accept_basic_recording(self, client: TestClient):
        resp = client.post("/api/record", json={
            "duration": 3.0,
            "record_audio": False,
        })
        assert resp.status_code == 200
        data = resp.json()
        assert data["accepted"] is True
        assert "move_id" in data

    def test_mode_becomes_queued(self, client: TestClient):
        client.post("/api/record", json={"duration": 3.0, "record_audio": False})
        state = client.get("/api/state").json()
        assert state["mode"] == "queued"

    def test_reject_when_busy(self, client: TestClient):
        # First recording is accepted
        resp1 = client.post("/api/record", json={"duration": 3.0, "record_audio": False})
        assert resp1.status_code == 200
        # Second recording is rejected (mode is now "queued")
        resp2 = client.post("/api/record", json={"duration": 3.0, "record_audio": False})
        assert resp2.status_code == 409

    def test_reject_invalid_duration_too_low(self, client: TestClient):
        resp = client.post("/api/record", json={"duration": 0.1, "record_audio": False})
        assert resp.status_code == 422  # Pydantic validation

    def test_reject_invalid_duration_too_high(self, client: TestClient):
        resp = client.post("/api/record", json={"duration": 999.0, "record_audio": False})
        assert resp.status_code == 422

    def test_accept_duration_edge_cases(self, client: TestClient, marionette: Marionette):
        # Just above minimum
        resp = client.post("/api/record", json={"duration": 0.6, "record_audio": False})
        assert resp.status_code == 200
        # Reset for next test
        marionette._set_idle_state()
        marionette._pending_recording = None

        # At maximum
        resp = client.post("/api/record", json={"duration": 300.0, "record_audio": False})
        assert resp.status_code == 200

    def test_custom_label(self, client: TestClient):
        resp = client.post("/api/record", json={
            "duration": 3.0,
            "record_audio": False,
            "label": "happy-dance",
        })
        data = resp.json()
        assert data["label"] == "happy-dance"
        assert data["move_id"] == "happy-dance"

    def test_label_collision_appends_index(
        self, client: TestClient, marionette: Marionette, tmp_dataset_root: Path
    ):
        # Create a file that would collide
        data_dir = tmp_dataset_root / "local_dataset" / DATASET_DATA_SUBDIR
        data_dir.mkdir(parents=True, exist_ok=True)
        (data_dir / "happy-dance.json").write_text("{}")

        resp = client.post("/api/record", json={
            "duration": 3.0,
            "record_audio": False,
            "label": "happy-dance",
        })
        data = resp.json()
        assert data["move_id"] == "happy-dance-1"

    def test_preferred_duration_saved(self, client: TestClient, marionette: Marionette):
        client.post("/api/record", json={"duration": 7.5, "record_audio": False})
        assert marionette._preferred_duration == 7.5


# ──────── Playback endpoint tests ─────────────────────────────────────


class TestPlayEndpoint:
    def test_reject_missing_move(self, client: TestClient):
        resp = client.post("/api/play", json={"move_id": "nonexistent"})
        assert resp.status_code == 404

    def test_accept_existing_move(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        # Write a move file to the dataset
        data_dir = marionette._dataset_dir
        move_path = data_dir / "test-move.json"
        move_path.write_text(json.dumps(sample_move_json))
        marionette._refresh_recordings()

        resp = client.post("/api/play", json={"move_id": "test-move"})
        assert resp.status_code == 200
        assert resp.json()["accepted"] is True

    def test_reject_play_when_busy(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        (data_dir / "test-move.json").write_text(json.dumps(sample_move_json))
        marionette._refresh_recordings()

        # First play is accepted
        resp1 = client.post("/api/play", json={"move_id": "test-move"})
        assert resp1.status_code == 200
        # Second play is rejected (mode is queued)
        resp2 = client.post("/api/play", json={"move_id": "test-move"})
        assert resp2.status_code == 409


# ──────── Stop endpoints ──────────────────────────────────────────────


class TestStopEndpoints:
    def test_stop_playback_when_not_playing(self, client: TestClient):
        resp = client.post("/api/play/stop")
        assert resp.status_code == 200
        assert resp.json()["stopped"] is False

    def test_stop_recording_when_not_recording(self, client: TestClient):
        resp = client.post("/api/record/stop")
        assert resp.status_code == 200
        assert resp.json()["stopped"] is False


# ──────── Move deletion tests ─────────────────────────────────────────


class TestMoveDelete:
    def test_delete_existing_move(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        move_path = data_dir / "to-delete.json"
        move_path.write_text(json.dumps(sample_move_json))
        marionette._refresh_recordings()

        resp = client.delete("/api/moves/to-delete")
        assert resp.status_code == 200
        assert not move_path.exists()

    def test_delete_nonexistent_move(self, client: TestClient):
        resp = client.delete("/api/moves/nonexistent")
        assert resp.status_code == 404

    def test_delete_removes_wav(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        (data_dir / "with-audio.json").write_text(json.dumps(sample_move_json))
        (data_dir / "with-audio.wav").write_bytes(b"RIFF" + b"\x00" * 100)
        marionette._refresh_recordings()

        client.delete("/api/moves/with-audio")
        assert not (data_dir / "with-audio.json").exists()
        assert not (data_dir / "with-audio.wav").exists()

    def test_delete_updates_move_list(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        (data_dir / "test-move.json").write_text(json.dumps(sample_move_json))
        marionette._refresh_recordings()

        state_before = client.get("/api/state").json()
        assert len(state_before["moves"]) == 1

        client.delete("/api/moves/test-move")
        state_after = client.get("/api/state").json()
        assert len(state_after["moves"]) == 0


# ──────── Dataset management tests ────────────────────────────────────


class TestDatasets:
    def test_initial_default_dataset(self, client: TestClient):
        data = client.get("/api/state").json()
        datasets = data["datasets"]
        assert datasets["active_id"] is not None
        assert len(datasets["entries"]) >= 1

    def test_create_dataset(self, client: TestClient):
        resp = client.post("/api/datasets", json={"name": "My Dances"})
        assert resp.status_code == 200
        data = resp.json()
        assert data["status"] == "created"
        assert data["dataset"]["folder"] == "my-dances"

    def test_create_duplicate_dataset_rejected(self, client: TestClient):
        client.post("/api/datasets", json={"name": "dances"})
        resp = client.post("/api/datasets", json={"name": "dances"})
        assert resp.status_code == 409

    def test_select_dataset(self, client: TestClient):
        # Create a second dataset
        resp = client.post("/api/datasets", json={"name": "second"})
        dataset_id = resp.json()["dataset"]["id"]

        # Default is auto-selected after create, so select the original
        state = client.get("/api/state").json()
        original_id = [
            e["id"] for e in state["datasets"]["entries"]
            if e["id"] != dataset_id
        ][0]

        resp = client.post("/api/datasets/select", json={"dataset_id": original_id})
        assert resp.status_code == 200

    def test_select_nonexistent_dataset(self, client: TestClient):
        resp = client.post("/api/datasets/select", json={"dataset_id": "fake"})
        assert resp.status_code == 404

    def test_dataset_root_change(self, client: TestClient, tmp_path: Path):
        new_root = tmp_path / "new_root"
        new_root.mkdir()
        resp = client.post("/api/datasets/root", json={"path": str(new_root)})
        assert resp.status_code == 200
        assert resp.json()["root_path"] == str(new_root)


# ──────── Registry persistence tests ──────────────────────────────────


class TestRegistryPersistence:
    def test_registry_created_on_init(self, tmp_registry: Path, tmp_dataset_root: Path):
        create_app(registry_path=tmp_registry, dataset_root=tmp_dataset_root)
        assert tmp_registry.exists()
        data = json.loads(tmp_registry.read_text())
        assert "active" in data
        assert "datasets" in data

    def test_registry_survives_restart(self, tmp_registry: Path, tmp_dataset_root: Path):
        # First instance creates a dataset
        app1, m1 = create_app(registry_path=tmp_registry, dataset_root=tmp_dataset_root)
        client1 = TestClient(app1)
        client1.post("/api/datasets", json={"name": "persistent-ds"})

        # Second instance should see it
        app2, m2 = create_app(registry_path=tmp_registry, dataset_root=tmp_dataset_root)
        client2 = TestClient(app2)
        state = client2.get("/api/state").json()
        folders = [e["folder"] for e in state["datasets"]["entries"]]
        assert "persistent-ds" in folders

    def test_preferred_duration_persisted(self, tmp_registry: Path, tmp_dataset_root: Path):
        app1, m1 = create_app(registry_path=tmp_registry, dataset_root=tmp_dataset_root)
        client1 = TestClient(app1)
        client1.post("/api/record", json={"duration": 8.5, "record_audio": False})

        # Re-create and check
        _, m2 = create_app(registry_path=tmp_registry, dataset_root=tmp_dataset_root)
        assert m2._preferred_duration == 8.5


# ──────── Moves list / refresh tests ──────────────────────────────────


class TestMovesRefresh:
    def test_moves_appear_after_file_creation(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        (data_dir / "my-move.json").write_text(json.dumps(sample_move_json))
        marionette._refresh_recordings()

        state = client.get("/api/state").json()
        move_ids = [m["id"] for m in state["moves"]]
        assert "my-move" in move_ids

    def test_move_duration_computed_correctly(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        (data_dir / "timed.json").write_text(json.dumps(sample_move_json))
        marionette._refresh_recordings()

        state = client.get("/api/state").json()
        move = next(m for m in state["moves"] if m["id"] == "timed")
        # 500 frames at 100Hz = 4.99s (last timestamp is 4.99)
        assert 4.5 < move["duration"] < 5.5

    def test_move_has_audio_flag(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        (data_dir / "audio-move.json").write_text(json.dumps(sample_move_json))
        (data_dir / "audio-move.wav").write_bytes(b"RIFF" + b"\x00" * 100)
        marionette._refresh_recordings()

        state = client.get("/api/state").json()
        move = next(m for m in state["moves"] if m["id"] == "audio-move")
        assert move["has_audio"] is True

    def test_move_without_audio(
        self, client: TestClient, marionette: Marionette, sample_move_json: dict
    ):
        data_dir = marionette._dataset_dir
        (data_dir / "silent-move.json").write_text(json.dumps(sample_move_json))
        marionette._refresh_recordings()

        state = client.get("/api/state").json()
        move = next(m for m in state["moves"] if m["id"] == "silent-move")
        assert move["has_audio"] is False


# ──────── Experiment / feature toggle tests ───────────────────────────


class TestExperiments:
    def test_denoise_feature_removed(self, client: TestClient):
        """Denoise feature was removed; the features dict should not contain it."""
        data = client.get("/api/state").json()
        assert "denoise" not in data["config"]["features"]

    def test_toggle_motion_models(self, client: TestClient):
        resp = client.post("/api/experiments", json={"motion_models": True})
        assert resp.status_code == 200
        assert resp.json()["features"]["motion_models"] is True

    def test_update_duration(self, client: TestClient):
        resp = client.post("/api/experiments", json={"duration_seconds": 10.0})
        assert resp.status_code == 200
        assert resp.json()["preferred_duration"] == 10.0

    def test_no_changes(self, client: TestClient):
        resp = client.post("/api/experiments", json={})
        assert resp.json()["status"] == "unchanged"


# ──────── Sensor data dummy endpoint ──────────────────────────────────


class TestSensorData:
    def test_returns_empty(self, client: TestClient):
        resp = client.get("/sensor_data")
        assert resp.status_code == 200
        assert resp.json() == {}