"""
Voice HA (PR1 + PR2 + PR3) contract tests.

Tests enforce:
1. Node Worker voice capability flags (voice_tts, voice_llm, voice_stt)
2. Voice semaphore isolation from generic concurrency
3. Router voice scoring: prefer local, penalise high load
4. offload_client supports voice.* subject patterns
5. BFF VOICE_HA_ENABLED feature flag routes correctly
"""
import asyncio
import importlib
import importlib.util
import os
import sys
import types
import unittest
from unittest.mock import AsyncMock, MagicMock, patch

# ── helpers ──────────────────────────────────────────────────────────────────

def _reload_config(overrides: dict):
    """Reload node-worker config with env overrides."""
    worker_path = os.path.join(os.path.dirname(__file__), "..", "services", "node-worker")
    if worker_path not in sys.path:
        sys.path.insert(0, worker_path)
    for k, v in overrides.items():
        os.environ[k] = v
    try:
        import config as _cfg
        importlib.reload(_cfg)
        return _cfg
    finally:
        pass  # caller restores env if needed


# ═══════════════════════════════════════════════════════════════════════════
# PR1: Node Worker capability flags
# ═══════════════════════════════════════════════════════════════════════════

class TestNodeWorkerVoiceCaps(unittest.TestCase):

    def setUp(self):
        self._worker_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "node-worker"
        )
        if self._worker_path not in sys.path:
            sys.path.insert(0, self._worker_path)

    def test_config_has_voice_concurrency_vars(self):
        """Voice HA concurrency env vars must exist in config."""
        cfg = _reload_config({
            "STT_PROVIDER": "memory_service",
            "TTS_PROVIDER": "memory_service",
            "VOICE_MAX_CONCURRENT_TTS": "4",
            "VOICE_MAX_CONCURRENT_LLM": "2",
            "VOICE_MAX_CONCURRENT_STT": "2",
        })
        self.assertEqual(cfg.VOICE_MAX_CONCURRENT_TTS, 4)
        self.assertEqual(cfg.VOICE_MAX_CONCURRENT_LLM, 2)
        self.assertEqual(cfg.VOICE_MAX_CONCURRENT_STT, 2)

    def test_config_has_voice_deadline_vars(self):
        cfg = _reload_config({
            "VOICE_TTS_DEADLINE_MS": "3000",
            "VOICE_LLM_FAST_MS": "9000",
            "VOICE_LLM_QUALITY_MS": "12000",
            "VOICE_STT_DEADLINE_MS": "6000",
        })
        self.assertEqual(cfg.VOICE_TTS_DEADLINE_MS, 3000)
        self.assertEqual(cfg.VOICE_LLM_FAST_MS, 9000)
        self.assertEqual(cfg.VOICE_STT_DEADLINE_MS, 6000)

    def test_voice_tts_false_when_tts_provider_none(self):
        """voice_tts SEMANTIC capability must be False when TTS_PROVIDER=none."""
        cfg = _reload_config({"TTS_PROVIDER": "none"})
        self.assertEqual(cfg.TTS_PROVIDER, "none")
        # Semantic: voice_tts = (TTS_PROVIDER != "none")
        voice_tts_cap = cfg.TTS_PROVIDER != "none"
        self.assertFalse(voice_tts_cap)

    def test_voice_tts_true_when_memory_service(self):
        """voice_tts SEMANTIC capability must be True when TTS_PROVIDER=memory_service."""
        cfg = _reload_config({"TTS_PROVIDER": "memory_service"})
        self.assertEqual(cfg.TTS_PROVIDER, "memory_service")
        # Semantic: provider configured → capability available (not NATS-dependent)
        voice_tts_cap = cfg.TTS_PROVIDER != "none"
        self.assertTrue(voice_tts_cap)

    def test_voice_cap_semantic_not_nats_dependent(self):
        """voice_* capability must NOT depend on NATS subscription state.

        Semantics = provider configured.
        Operational state (NATS active) is separate (runtime.nats_subscriptions).
        """
        cfg = _reload_config({"TTS_PROVIDER": "memory_service", "STT_PROVIDER": "memory_service"})
        # Even if NATS subscriptions were empty (reconnect / restart race),
        # semantic caps must still be True
        voice_tts_semantic = cfg.TTS_PROVIDER != "none"
        voice_stt_semantic = cfg.STT_PROVIDER != "none"
        self.assertTrue(voice_tts_semantic, "voice_tts semantic must be True regardless of NATS")
        self.assertTrue(voice_stt_semantic, "voice_stt semantic must be True regardless of NATS")

    def test_voice_concurrency_env_override(self):
        cfg = _reload_config({"VOICE_MAX_CONCURRENT_TTS": "8"})
        self.assertEqual(cfg.VOICE_MAX_CONCURRENT_TTS, 8)

    def test_voice_semaphores_independent_from_generic(self):
        """Voice semaphore limit must not equal MAX_CONCURRENCY (they are independent)."""
        cfg = _reload_config({
            "NODE_WORKER_MAX_CONCURRENCY": "2",
            "VOICE_MAX_CONCURRENT_TTS": "4",
        })
        self.assertEqual(cfg.MAX_CONCURRENCY, 2)
        self.assertEqual(cfg.VOICE_MAX_CONCURRENT_TTS, 4)
        self.assertNotEqual(cfg.MAX_CONCURRENCY, cfg.VOICE_MAX_CONCURRENT_TTS)


class TestNodeWorkerVoiceSubjects(unittest.TestCase):
    """Worker must register voice.* NATS subjects when providers configured."""

    def setUp(self):
        self._worker_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "node-worker"
        )
        if self._worker_path not in sys.path:
            sys.path.insert(0, self._worker_path)

    def test_voice_subjects_set_exists(self):
        import worker
        self.assertTrue(hasattr(worker, "_VOICE_SUBJECTS"))
        self.assertIsInstance(worker._VOICE_SUBJECTS, set)

    def test_voice_semaphores_defined(self):
        import worker
        self.assertTrue(hasattr(worker, "_voice_sem_tts"))
        self.assertTrue(hasattr(worker, "_voice_sem_llm"))
        self.assertTrue(hasattr(worker, "_voice_sem_stt"))
        self.assertIsInstance(worker._voice_sem_tts, asyncio.Semaphore)

    def test_voice_semaphore_map_keys(self):
        import worker
        sem_map = worker._VOICE_SEMAPHORES
        self.assertIn("voice.tts", sem_map)
        self.assertIn("voice.llm", sem_map)
        self.assertIn("voice.stt", sem_map)


class TestFabricMetricsVoice(unittest.TestCase):
    """fabric_metrics must expose voice HA metric helpers."""

    def setUp(self):
        self._worker_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "node-worker"
        )
        if self._worker_path not in sys.path:
            sys.path.insert(0, self._worker_path)

    def test_voice_metric_functions_exist(self):
        import fabric_metrics as fm
        self.assertTrue(callable(fm.inc_voice_job))
        self.assertTrue(callable(fm.set_voice_inflight))
        self.assertTrue(callable(fm.observe_voice_latency))

    def test_voice_metric_functions_no_raise(self):
        import fabric_metrics as fm
        # Should not raise regardless of prometheus_client availability
        fm.inc_voice_job("voice.tts", "ok")
        fm.set_voice_inflight("voice.tts", 1)
        fm.observe_voice_latency("voice.tts", 1500)


# ═══════════════════════════════════════════════════════════════════════════
# PR2: Router offload_client voice subjects
# ═══════════════════════════════════════════════════════════════════════════

class TestOffloadClientVoiceSubjects(unittest.TestCase):

    def setUp(self):
        self._router_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "router"
        )
        if self._router_path not in sys.path:
            sys.path.insert(0, self._router_path)

    def test_offload_voice_tts_uses_dotted_subject(self):
        """voice.tts → node.{id}.voice.tts.request (not node.{id}.tts.request)."""
        import offload_client
        # The subject is built as f"node.{node_id}.{required_type}.request"
        # So required_type="voice.tts" → "node.noda2.voice.tts.request"
        node_id = "noda2"
        req_type = "voice.tts"
        expected_subject = f"node.{node_id}.{req_type}.request"
        self.assertEqual(expected_subject, "node.noda2.voice.tts.request")

    def test_offload_generic_tts_uses_flat_subject(self):
        """Generic tts → node.{id}.tts.request (unchanged)."""
        req_type = "tts"
        node_id = "noda2"
        expected_subject = f"node.{node_id}.{req_type}.request"
        self.assertEqual(expected_subject, "node.noda2.tts.request")
        # Must differ from voice subject
        self.assertNotEqual("node.noda2.tts.request", "node.noda2.voice.tts.request")

    def test_offload_client_accepts_voice_type(self):
        """offload_infer signature must accept voice.* types (no Literal restriction)."""
        import inspect
        import offload_client
        sig = inspect.signature(offload_client.offload_infer)
        param = sig.parameters.get("required_type")
        self.assertIsNotNone(param, "required_type parameter must exist")
        # Must not be restricted to old Literal — annotation should be str or Any
        ann = param.annotation
        ann_str = str(ann)
        self.assertNotIn("Literal", ann_str,
                         "required_type must not be Literal (voice.* types needed)")


class TestRouterFabricMetricsVoice(unittest.TestCase):
    """Test router/fabric_metrics.py voice helper functions.

    Loads the module directly via importlib to avoid collision with
    node-worker's fabric_metrics that is earlier in sys.path.
    """

    def _load_router_fm(self):
        router_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "router", "fabric_metrics.py"
        )
        spec = importlib.util.spec_from_file_location("router_fabric_metrics", router_path)
        mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(mod)
        return mod

    def test_router_voice_metric_functions_exist(self):
        fm = self._load_router_fm()
        self.assertTrue(callable(fm.inc_voice_cap_request))
        self.assertTrue(callable(fm.inc_voice_offload))
        self.assertTrue(callable(fm.set_voice_breaker))
        self.assertTrue(callable(fm.observe_voice_score))

    def test_router_voice_metrics_no_raise(self):
        fm = self._load_router_fm()
        fm.inc_voice_cap_request("voice_tts", "ok")
        fm.inc_voice_offload("voice_tts", "noda2", "ok")
        fm.set_voice_breaker("voice_tts", "noda2", False)
        fm.observe_voice_score("voice_tts", 250.0)


# ═══════════════════════════════════════════════════════════════════════════
# PR3: BFF config feature flag
# ═══════════════════════════════════════════════════════════════════════════

class TestBFFVoiceHAConfig(unittest.TestCase):

    def setUp(self):
        self._console_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "sofiia-console", "app"
        )
        # Add parent for package import
        parent = os.path.join(os.path.dirname(__file__), "..", "services", "sofiia-console")
        if parent not in sys.path:
            sys.path.insert(0, parent)

    def _reload_bff_config(self, voice_ha: str = "false"):
        os.environ["VOICE_HA_ENABLED"] = voice_ha
        from app import config as bff_config
        importlib.reload(bff_config)
        return bff_config

    def test_voice_ha_disabled_by_default(self):
        os.environ.pop("VOICE_HA_ENABLED", None)
        from app import config as bff_config
        importlib.reload(bff_config)
        self.assertFalse(bff_config.is_voice_ha_enabled())

    def test_voice_ha_enabled_via_env(self):
        cfg = self._reload_bff_config("true")
        self.assertTrue(cfg.is_voice_ha_enabled())

    def test_voice_ha_disabled_explicit(self):
        cfg = self._reload_bff_config("false")
        self.assertFalse(cfg.is_voice_ha_enabled())

    def test_voice_ha_enabled_variants(self):
        for val in ("1", "yes", "true", "True", "YES"):
            os.environ["VOICE_HA_ENABLED"] = val
            from app import config as bff_config
            importlib.reload(bff_config)
            self.assertTrue(bff_config.is_voice_ha_enabled(), f"Failed for value: {val}")

    def test_voice_ha_router_url_default(self):
        os.environ.pop("VOICE_HA_ROUTER_URL", None)
        os.environ.pop("NODES_NODA2_ROUTER_URL", None)
        from app import config as bff_config
        importlib.reload(bff_config)
        url = bff_config.get_voice_ha_router_url()
        # Must return a string URL, not empty
        self.assertIsInstance(url, str)
        self.assertTrue(url.startswith("http"))

    def test_voice_ha_router_url_override(self):
        os.environ["VOICE_HA_ROUTER_URL"] = "http://router-ha:9200"
        from app import config as bff_config
        importlib.reload(bff_config)
        url = bff_config.get_voice_ha_router_url()
        self.assertEqual(url, "http://router-ha:9200")
        del os.environ["VOICE_HA_ROUTER_URL"]

    def tearDown(self):
        os.environ.pop("VOICE_HA_ENABLED", None)
        os.environ.pop("VOICE_HA_ROUTER_URL", None)


# ═══════════════════════════════════════════════════════════════════════════
# Voice scoring logic: prefer local, penalise high load
# ═══════════════════════════════════════════════════════════════════════════

class TestVoiceHAScoringLogic(unittest.TestCase):
    """Unit tests for voice node scoring formula (inline, no Router import needed)."""

    def _score(self, node_load: dict, runtime_load: dict,
               router_node: str, node_id: str,
               prefer_bonus: int = 200) -> int:
        """Replicate the scoring formula from Router voice_capability_offload."""
        nl = node_load
        rl = runtime_load
        wait_ms = nl.get("wait_ms", 0) or nl.get("inflight", 0) * 50
        rtt_ms = nl.get("rtt_ms", 0)
        p95_ms = rl.get("p95_ms", 0) if rl else 0
        mem_penalty = 300 if nl.get("mem_pressure") == "high" else 0
        local_bonus = prefer_bonus if node_id.lower() == router_node.lower() else 0
        return wait_ms + rtt_ms + p95_ms + mem_penalty - local_bonus

    def test_local_node_preferred_when_load_similar(self):
        local_score = self._score(
            {"wait_ms": 50, "rtt_ms": 5},
            {"p95_ms": 300},
            router_node="noda2", node_id="noda2",
        )
        remote_score = self._score(
            {"wait_ms": 60, "rtt_ms": 80},
            {"p95_ms": 350},
            router_node="noda2", node_id="noda1",
        )
        self.assertLess(local_score, remote_score, "Local should win when loads similar")

    def test_remote_wins_when_local_saturated(self):
        local_score = self._score(
            {"wait_ms": 2000, "rtt_ms": 5, "mem_pressure": "high"},
            {"p95_ms": 1500},
            router_node="noda2", node_id="noda2",
        )
        remote_score = self._score(
            {"wait_ms": 100, "rtt_ms": 80},
            {"p95_ms": 400},
            router_node="noda2", node_id="noda1",
        )
        self.assertLess(remote_score, local_score, "Remote should win when local is saturated")

    def test_mem_pressure_high_adds_penalty(self):
        score_normal = self._score(
            {"wait_ms": 0},
            {},
            router_node="noda1", node_id="noda2",
        )
        score_high_mem = self._score(
            {"wait_ms": 0, "mem_pressure": "high"},
            {},
            router_node="noda1", node_id="noda2",
        )
        self.assertEqual(score_high_mem - score_normal, 300)

    def test_no_silent_fallback_contract(self):
        """Verify scoring never returns negative score for non-local nodes (no accidental preference)."""
        score = self._score(
            {"wait_ms": 100, "rtt_ms": 50},
            {"p95_ms": 200},
            router_node="noda1", node_id="noda2",  # noda2 != router's noda1 → no local bonus
        )
        self.assertGreater(score, 0, "Remote node score must be positive")


# ═══════════════════════════════════════════════════════════════════════════
# Invariants: no silent fallback, all voice failures log + increment counter
# ═══════════════════════════════════════════════════════════════════════════

class TestVoiceMetricsCardinality(unittest.TestCase):
    """Voice metrics must use bounded label values to prevent cardinality explosion."""

    VALID_CAP_LABELS = {"voice_tts", "voice_llm", "voice_stt"}

    def test_valid_cap_labels_are_bounded(self):
        """Only 3 valid cap labels exist — prevents Prometheus cardinality explosion."""
        self.assertEqual(len(self.VALID_CAP_LABELS), 3)
        self.assertIn("voice_tts", self.VALID_CAP_LABELS)
        self.assertIn("voice_llm", self.VALID_CAP_LABELS)
        self.assertIn("voice_stt", self.VALID_CAP_LABELS)
        self.assertNotIn("voice_sst", self.VALID_CAP_LABELS)  # typo guard

    def test_no_sst_label_in_router_main(self):
        """Router main.py must not contain 'voice_sst' (typo guard)."""
        router_main = os.path.join(
            os.path.dirname(__file__), "..", "services", "router", "main.py"
        )
        with open(router_main, "r") as f:
            content = f.read()
        self.assertNotIn("voice_sst", content, "Typo 'voice_sst' found in router/main.py")

    def test_no_sst_label_in_worker(self):
        """Node-worker must not contain 'voice_sst' (typo guard)."""
        for fname in ["worker.py", "main.py", "config.py"]:
            path = os.path.join(os.path.dirname(__file__), "..", "services", "node-worker", fname)
            with open(path, "r") as f:
                content = f.read()
            self.assertNotIn("voice_sst", content, f"Typo 'voice_sst' found in {fname}")

    def test_no_sst_label_in_offload_client(self):
        """offload_client.py must not contain 'voice.sst' subject."""
        path = os.path.join(
            os.path.dirname(__file__), "..", "services", "router", "offload_client.py"
        )
        with open(path, "r") as f:
            content = f.read()
        self.assertNotIn("voice.sst", content, "Typo 'voice.sst' found in offload_client.py")

    def test_router_valid_caps_set_uses_stt(self):
        """Router voice endpoint must validate 'stt' not 'sst'."""
        router_main = os.path.join(
            os.path.dirname(__file__), "..", "services", "router", "main.py"
        )
        with open(router_main, "r") as f:
            content = f.read()
        self.assertIn('"stt"', content, "Router must include 'stt' in valid_caps")

    def test_caps_semantics_runtime_separation_in_worker_main(self):
        """node-worker /caps must separate semantic caps from runtime NATS subscriptions."""
        main_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "node-worker", "main.py"
        )
        with open(main_path, "r") as f:
            content = f.read()
        self.assertIn("nats_subscriptions", content,
                      "Operational NATS subscription state must be in runtime section, separate from capabilities")
        # capabilities must not reference _VOICE_SUBJECTS for semantic flags
        # (allowed in runtime section only)
        import re
        caps_block = re.search(r'"capabilities":\s*\{(.*?)\},', content, re.DOTALL)
        if caps_block:
            caps_text = caps_block.group(1)
            self.assertNotIn("_VOICE_SUBJECTS", caps_text,
                             "Semantic caps must not depend on _VOICE_SUBJECTS (NATS state)")


class TestVoiceHANoSilentFallback(unittest.TestCase):

    def setUp(self):
        self._worker_path = os.path.join(
            os.path.dirname(__file__), "..", "services", "node-worker"
        )
        if self._worker_path not in sys.path:
            sys.path.insert(0, self._worker_path)

    def test_handle_voice_request_logs_warning_on_busy(self):
        """_handle_voice_request must log WARNING (not silently skip) when semaphore full."""
        import worker

        # Create a full semaphore (0 slots)
        full_sem = asyncio.Semaphore(0)

        msg = MagicMock()
        msg.data = b'{"job_id":"test","required_type":"tts","payload":{},"deadline_ts":9999999999999}'

        replies = []

        async def _fake_reply(m, resp):
            replies.append(resp)

        async def run():
            with patch.object(worker, "_reply", side_effect=_fake_reply), \
                 patch.object(worker, "logger") as mock_log:
                await worker._handle_voice_request(msg, voice_sem=full_sem, cap_key="voice.tts")
                return mock_log

        mock_log = asyncio.run(run())

        # Must have sent a TOO_BUSY response
        self.assertTrue(len(replies) >= 1)
        resp = replies[0]
        self.assertIn(resp.status, ("busy", "error"))

    def test_voice_job_not_silently_ignored(self):
        """Voice job handler must always send a reply, never drop the message."""
        import worker

        sem = asyncio.Semaphore(2)
        msg = MagicMock()
        msg.data = b'invalid json{'  # will raise JSONDecodeError

        replies = []

        async def _fake_reply(m, resp):
            replies.append(resp)

        async def run():
            with patch.object(worker, "_reply", side_effect=_fake_reply):
                await worker._handle_voice_request(msg, voice_sem=sem, cap_key="voice.tts")

        asyncio.run(run())
        self.assertTrue(len(replies) >= 1, "Must always send a reply, even on parse error")


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