"""Tests for price history feature."""

from datetime import UTC, datetime
from typing import Any
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from models import PriceHistory
from price_fetcher import PAIR_BTC_EUR, SOURCE_BITFINEX, fetch_btc_eur_price


def create_mock_httpx_client(
    json_response: list[Any] | dict[str, Any] | None = None,
    raise_for_status_error: Exception | None = None,
    get_error: Exception | None = None,
) -> AsyncMock:
    """
    Create a mock httpx.AsyncClient for testing.

    Args:
        json_response: The JSON data to return from response.json()
        raise_for_status_error: Exception to raise from response.raise_for_status()
        get_error: Exception to raise from client.get()

    Returns:
        A mock AsyncClient configured as an async context manager.
    """
    mock_client = AsyncMock()
    mock_client.__aenter__.return_value = mock_client
    mock_client.__aexit__.return_value = None

    if get_error:
        mock_client.get.side_effect = get_error
    else:
        mock_response = MagicMock()
        if raise_for_status_error:
            mock_response.raise_for_status.side_effect = raise_for_status_error
        else:
            mock_response.raise_for_status = MagicMock()
        mock_response.json.return_value = json_response
        mock_client.get.return_value = mock_response

    return mock_client


def create_bitfinex_ticker_response(price: float) -> list[float]:
    """Create a Bitfinex ticker response array with the given price at index 6."""
    return [0, 0, 0, 0, 0, 0, price, 0, 0, 0]


class TestFetchBtcEurPrice:
    """Tests for the Bitfinex price fetcher."""

    @pytest.mark.asyncio
    async def test_parses_response_correctly(self):
        """Verify price is extracted from correct index in response array."""
        # Full Bitfinex ticker format for documentation
        json_response = [
            100.0,  # BID
            10.0,  # BID_SIZE
            101.0,  # ASK
            10.0,  # ASK_SIZE
            1.0,  # DAILY_CHANGE
            0.01,  # DAILY_CHANGE_RELATIVE
            95000.50,  # LAST_PRICE (index 6)
            500.0,  # VOLUME
            96000.0,  # HIGH
            94000.0,  # LOW
        ]
        mock_client = create_mock_httpx_client(json_response=json_response)

        with patch("price_fetcher.httpx.AsyncClient", return_value=mock_client):
            price, timestamp = await fetch_btc_eur_price()

        assert price == 95000.50
        assert isinstance(timestamp, datetime)
        assert timestamp.tzinfo == UTC

    @pytest.mark.asyncio
    async def test_raises_on_http_error(self):
        """Verify HTTP errors are propagated."""
        import httpx

        error = httpx.HTTPStatusError(
            "Server Error", request=MagicMock(), response=MagicMock()
        )
        mock_client = create_mock_httpx_client(raise_for_status_error=error)

        with (
            patch("price_fetcher.httpx.AsyncClient", return_value=mock_client),
            pytest.raises(httpx.HTTPStatusError),
        ):
            await fetch_btc_eur_price()

    @pytest.mark.asyncio
    async def test_raises_on_network_error(self):
        """Verify network errors (ConnectError, TimeoutException) are propagated."""
        import httpx

        error = httpx.ConnectError("Connection refused")
        mock_client = create_mock_httpx_client(get_error=error)

        with (
            patch("price_fetcher.httpx.AsyncClient", return_value=mock_client),
            pytest.raises(httpx.ConnectError),
        ):
            await fetch_btc_eur_price()

    @pytest.mark.asyncio
    async def test_raises_on_invalid_response_format(self):
        """Verify ValueError is raised for unexpected response format."""
        mock_client = create_mock_httpx_client(json_response={"error": "unexpected"})

        with (
            patch("price_fetcher.httpx.AsyncClient", return_value=mock_client),
            pytest.raises(ValueError, match="Unexpected response format"),
        ):
            await fetch_btc_eur_price()

    @pytest.mark.asyncio
    async def test_raises_on_short_array(self):
        """Verify ValueError is raised if array is too short."""
        mock_client = create_mock_httpx_client(json_response=[1, 2, 3])  # Too short

        with (
            patch("price_fetcher.httpx.AsyncClient", return_value=mock_client),
            pytest.raises(ValueError, match="Unexpected response format"),
        ):
            await fetch_btc_eur_price()


class TestGetPriceHistory:
    """Tests for GET /api/audit/price-history endpoint."""

    @pytest.mark.asyncio
    async def test_requires_auth(self, client):
        """Verify unauthenticated requests are rejected."""
        response = await client.get("/api/audit/price-history")
        assert response.status_code == 401

    @pytest.mark.asyncio
    async def test_requires_view_audit_permission(self, client_factory, regular_user):
        """Verify regular users cannot access price history."""
        async with client_factory.create(cookies=regular_user["cookies"]) as authed:
            response = await authed.get("/api/audit/price-history")
        assert response.status_code == 403

    @pytest.mark.asyncio
    async def test_admin_can_view_empty_list(self, client_factory, admin_user):
        """Verify admin can view price history (empty)."""
        async with client_factory.create(cookies=admin_user["cookies"]) as authed:
            response = await authed.get("/api/audit/price-history")
        assert response.status_code == 200
        assert response.json() == []

    @pytest.mark.asyncio
    async def test_returns_records_newest_first(self, client_factory, admin_user):
        """Verify records are returned in descending timestamp order."""
        # Seed some price history records
        async with client_factory.get_db_session() as db:
            now = datetime.now(UTC)
            for i in range(5):
                record = PriceHistory(
                    source=SOURCE_BITFINEX,
                    pair=PAIR_BTC_EUR,
                    price=90000.0 + i * 100,
                    timestamp=now.replace(second=i),
                )
                db.add(record)
            await db.commit()

        async with client_factory.create(cookies=admin_user["cookies"]) as authed:
            response = await authed.get("/api/audit/price-history")

        assert response.status_code == 200
        data = response.json()
        assert len(data) == 5
        # Newest first (highest second value = highest price in our test data)
        assert data[0]["price"] == 90400.0
        assert data[4]["price"] == 90000.0

    @pytest.mark.asyncio
    async def test_limits_to_20_records(self, client_factory, admin_user):
        """Verify only the 20 most recent records are returned."""
        async with client_factory.get_db_session() as db:
            now = datetime.now(UTC)
            for i in range(25):
                record = PriceHistory(
                    source=SOURCE_BITFINEX,
                    pair=PAIR_BTC_EUR,
                    price=90000.0 + i,
                    timestamp=now.replace(microsecond=i),
                )
                db.add(record)
            await db.commit()

        async with client_factory.create(cookies=admin_user["cookies"]) as authed:
            response = await authed.get("/api/audit/price-history")

        assert response.status_code == 200
        data = response.json()
        assert len(data) == 20


class TestManualFetch:
    """Tests for POST /api/audit/price-history/fetch endpoint."""

    @pytest.mark.asyncio
    async def test_requires_auth(self, client):
        """Verify unauthenticated requests are rejected."""
        response = await client.post("/api/audit/price-history/fetch")
        assert response.status_code == 401

    @pytest.mark.asyncio
    async def test_requires_fetch_price_permission(self, client_factory, regular_user):
        """Verify regular users cannot trigger manual fetch."""
        async with client_factory.create(cookies=regular_user["cookies"]) as authed:
            response = await authed.post("/api/audit/price-history/fetch")
        assert response.status_code == 403

    @pytest.mark.asyncio
    async def test_creates_record_on_success(self, client_factory, admin_user):
        """Verify manual fetch creates a price history record."""
        mock_client = create_mock_httpx_client(
            json_response=create_bitfinex_ticker_response(95123.45)
        )

        with patch("price_fetcher.httpx.AsyncClient", return_value=mock_client):
            async with client_factory.create(cookies=admin_user["cookies"]) as authed:
                response = await authed.post("/api/audit/price-history/fetch")

        assert response.status_code == 200
        data = response.json()
        assert data["source"] == SOURCE_BITFINEX
        assert data["pair"] == PAIR_BTC_EUR
        assert data["price"] == 95123.45
        assert "id" in data
        assert "timestamp" in data
        assert "created_at" in data

    @pytest.mark.asyncio
    async def test_record_persisted_to_database(self, client_factory, admin_user):
        """Verify the created record can be retrieved."""
        mock_client = create_mock_httpx_client(
            json_response=create_bitfinex_ticker_response(87654.32)
        )

        with patch("price_fetcher.httpx.AsyncClient", return_value=mock_client):
            async with client_factory.create(cookies=admin_user["cookies"]) as authed:
                # Create record
                await authed.post("/api/audit/price-history/fetch")

                # Verify it appears in GET
                response = await authed.get("/api/audit/price-history")

        assert response.status_code == 200
        data = response.json()
        assert len(data) == 1
        assert data[0]["price"] == 87654.32

    @pytest.mark.asyncio
    async def test_returns_existing_record_on_duplicate_timestamp(
        self, client_factory, admin_user
    ):
        """Verify duplicate timestamp returns existing record instead of error."""
        fixed_timestamp = datetime(2024, 1, 15, 12, 0, 0, tzinfo=UTC)

        # Seed an existing record with the same timestamp we'll get from the mock
        async with client_factory.get_db_session() as db:
            existing = PriceHistory(
                source=SOURCE_BITFINEX,
                pair=PAIR_BTC_EUR,
                price=90000.0,
                timestamp=fixed_timestamp,
            )
            db.add(existing)
            await db.commit()
            await db.refresh(existing)
            existing_id = existing.id

        # Mock fetch_btc_eur_price to return the same timestamp
        with patch("services.price.fetch_btc_eur_price") as mock_fetch:
            mock_fetch.return_value = (95000.0, fixed_timestamp)

            async with client_factory.create(cookies=admin_user["cookies"]) as authed:
                response = await authed.post("/api/audit/price-history/fetch")

        # Should succeed and return the existing record
        assert response.status_code == 200
        data = response.json()
        assert data["id"] == existing_id
        assert data["price"] == 90000.0  # Original price, not the new one