"""
Tests for schemas.py and nats_consumer._handle.
"""
import json
import pytest
import tempfile
from pathlib import Path
from pydantic import ValidationError
from unittest.mock import AsyncMock

from schemas import (
    TaskSyncedPayload,
    TipServedPayload,
    TipFeedbackPayload,
    TipRewardFailedPayload,
    IntegrationTokenExpiredPayload,
)
from nats_consumer import _handle, _sync_meta_path


# ── Schema validation ─────────────────────────────────────────────────────────

class TestTaskSyncedPayload:
    def test_valid(self):
        p = TaskSyncedPayload.model_validate(
            {"userId": "u1", "source": "todoist", "count": 5, "syncedAt": "2026-04-25T10:00:00Z"}
        )
        assert p.userId == "u1"
        assert p.count == 5

    def test_missing_field_raises(self):
        with pytest.raises(ValidationError):
            TaskSyncedPayload.model_validate({"userId": "u1", "source": "todoist"})

    def test_wrong_type_raises(self):
        with pytest.raises(ValidationError):
            TaskSyncedPayload.model_validate(
                {"userId": "u1", "source": "todoist", "count": "not-an-int", "syncedAt": "2026-04-25T10:00:00Z"}
            )


class TestTipFeedbackPayload:
    def test_valid_without_dwell(self):
        p = TipFeedbackPayload.model_validate(
            {"userId": "u1", "tipId": "t1", "action": "done", "reward": 1.0, "createdAt": "2026-04-25T10:00:00Z"}
        )
        assert p.dwellMs is None

    def test_valid_with_dwell(self):
        p = TipFeedbackPayload.model_validate(
            {"userId": "u1", "tipId": "t1", "action": "helpful", "reward": 0.5,
             "dwellMs": 3200, "createdAt": "2026-04-25T10:00:00Z"}
        )
        assert p.dwellMs == 3200

    def test_invalid_action_raises(self):
        with pytest.raises(ValidationError):
            TipFeedbackPayload.model_validate(
                {"userId": "u1", "tipId": "t1", "action": "like", "reward": 1.0, "createdAt": "2026-04-25T10:00:00Z"}
            )

    def test_all_valid_actions(self):
        for action in ("done", "dismiss", "snooze", "helpful", "not_helpful"):
            p = TipFeedbackPayload.model_validate(
                {"userId": "u1", "tipId": "t1", "action": action, "reward": 0.0, "createdAt": "2026-04-25T10:00:00Z"}
            )
            assert p.action == action


class TestOtherPayloads:
    def test_tip_served(self):
        p = TipServedPayload.model_validate(
            {"userId": "u1", "tipId": "t1", "policy": "egreedy-v2", "servedAt": "2026-04-25T10:00:00Z"}
        )
        assert p.policy == "egreedy-v2"

    def test_tip_reward_failed(self):
        p = TipRewardFailedPayload.model_validate(
            {"userId": "u1", "tipId": "t1", "reward": 1.0, "attempts": 3,
             "error": "timeout", "failedAt": "2026-04-25T10:00:00Z"}
        )
        assert p.attempts == 3

    def test_integration_token_expired(self):
        p = IntegrationTokenExpiredPayload.model_validate(
            {"userId": "u1", "provider": "todoist", "detectedAt": "2026-04-25T10:00:00Z"}
        )
        assert p.provider == "todoist"


# ── _handle behaviour ─────────────────────────────────────────────────────────

TASK_SYNCED = {
    "userId": "user-abc",
    "source": "todoist",
    "count": 7,
    "syncedAt": "2026-04-25T10:00:00Z",
}

TIP_FEEDBACK = {
    "userId": "user-abc",
    "tipId": "tip-xyz",
    "action": "done",
    "reward": 1.0,
    "dwellMs": 4200,
    "createdAt": "2026-04-25T10:00:00Z",
}


class TestHandle:
    @pytest.mark.asyncio
    async def test_task_synced_writes_meta_file(self):
        with tempfile.TemporaryDirectory() as tmp:
            state_dir = Path(tmp)
            await _handle("signals.task.synced", TASK_SYNCED, state_dir)
            meta_path = _sync_meta_path(state_dir, "user-abc")
            assert meta_path.exists()
            data = json.loads(meta_path.read_text())
            assert data["task_count"] == 7
            assert data["last_sync_ts"] == "2026-04-25T10:00:00Z"

    @pytest.mark.asyncio
    async def test_task_synced_bad_payload_raises(self):
        with tempfile.TemporaryDirectory() as tmp:
            with pytest.raises(ValidationError):
                await _handle("signals.task.synced", {"userId": "u1"}, Path(tmp))

    @pytest.mark.asyncio
    async def test_tip_feedback_valid_does_not_raise(self):
        with tempfile.TemporaryDirectory() as tmp:
            # should log and return cleanly
            await _handle("signals.tip.feedback", TIP_FEEDBACK, Path(tmp))

    @pytest.mark.asyncio
    async def test_tip_feedback_bad_action_raises(self):
        bad = {**TIP_FEEDBACK, "action": "unknown"}
        with tempfile.TemporaryDirectory() as tmp:
            with pytest.raises(ValidationError):
                await _handle("signals.tip.feedback", bad, Path(tmp))

    @pytest.mark.asyncio
    async def test_unhandled_subject_is_ignored(self):
        with tempfile.TemporaryDirectory() as tmp:
            # should not raise for unknown subjects
            await _handle("signals.something.new", {"any": "data"}, Path(tmp))

    @pytest.mark.asyncio
    async def test_make_handler_acks_on_success(self):
        from nats_consumer import _make_handler
        with tempfile.TemporaryDirectory() as tmp:
            handler = _make_handler("signals", Path(tmp))
            msg = AsyncMock()
            msg.subject = "signals.task.synced"
            msg.data = json.dumps(TASK_SYNCED).encode()
            await handler(msg)
            msg.ack.assert_awaited_once()
            msg.nak.assert_not_awaited()

    @pytest.mark.asyncio
    async def test_make_handler_naks_on_validation_error(self):
        from nats_consumer import _make_handler
        with tempfile.TemporaryDirectory() as tmp:
            handler = _make_handler("signals", Path(tmp))
            msg = AsyncMock()
            msg.subject = "signals.task.synced"
            msg.data = json.dumps({"userId": "u1"}).encode()  # missing fields
            await handler(msg)
            msg.nak.assert_awaited_once()
            msg.ack.assert_not_awaited()