import asyncio
import json
from pathlib import Path
from unittest.mock import Mock, patch

import numpy as np
import pytest
import requests
from loguru import logger

from akkudoktoreos.core.cache import CacheFileStore
from akkudoktoreos.core.coreabc import get_ems
from akkudoktoreos.prediction.elecpriceakkudoktor import (
    AkkudoktorElecPrice,
    AkkudoktorElecPriceValue,
    ElecPriceAkkudoktor,
)
from akkudoktoreos.utils.datetimeutil import to_datetime

DIR_TESTDATA = Path(__file__).absolute().parent.joinpath("testdata")

FILE_TESTDATA_ELECPRICEAKKUDOKTOR_1_JSON = DIR_TESTDATA.joinpath(
    "elecpriceforecast_akkudoktor_1.json"
)


@pytest.fixture
def provider(config_eos):
    """Fixture to create a ElecPriceProvider instance."""
    config_eos.merge_settings_from_dict(
        {
            "elecprice": {
                "provider": "ElecPriceAkkudoktor",
            },
        }
    )
    provider = ElecPriceAkkudoktor()
    provider.highest_orig_datetime = None
    assert provider.enabled()
    provider._db_reset_state()
    return provider


@pytest.fixture
def sample_akkudoktor_1_json():
    """Fixture that returns sample forecast data report."""
    with FILE_TESTDATA_ELECPRICEAKKUDOKTOR_1_JSON.open(
        "r", encoding="utf-8", newline=None
    ) as f_res:
        input_data = json.load(f_res)
    return input_data


@pytest.fixture
def cache_store():
    """A pytest fixture that creates a new CacheFileStore instance for testing."""
    return CacheFileStore()


class TestElecPriceAkkudokor:
    # ------------------------------------------------
    # General forecast
    # ------------------------------------------------

    def test_singleton_instance(self, provider):
        """Test that ElecPriceForecast behaves as a singleton."""
        another_instance = ElecPriceAkkudoktor()
        assert provider is another_instance


    def test_invalid_provider(self, provider, monkeypatch):
        """Test requesting an unsupported provider."""
        monkeypatch.setenv("EOS_ELECPRICE__ELECPRICE_PROVIDER", "<invalid>")
        provider.config.reset_settings()
        assert not provider.enabled()


    # ------------------------------------------------
    # Akkudoktor
    # ------------------------------------------------


    @patch("akkudoktoreos.prediction.elecpriceakkudoktor.logger.error")
    def test_validate_data_invalid_format(self, mock_logger, provider):
        """Test validation for invalid Akkudoktor data."""
        invalid_data = '{"invalid": "data"}'
        with pytest.raises(ValueError):
            provider._validate_data(invalid_data)
        mock_logger.assert_called_once_with(mock_logger.call_args[0][0])


    @patch("requests.get")
    def test_request_forecast(self, mock_get, provider, sample_akkudoktor_1_json):
        """Test requesting forecast from Akkudoktor."""
        # Mock response object
        mock_response = Mock()
        mock_response.status_code = 200
        mock_response.content = json.dumps(sample_akkudoktor_1_json)
        mock_get.return_value = mock_response

        # Test function
        akkudoktor_data = provider._request_forecast()

        assert isinstance(akkudoktor_data, AkkudoktorElecPrice)
        assert akkudoktor_data.values[0].model_dump() == AkkudoktorElecPriceValue(
            start_timestamp=1733785200000,
            end_timestamp=1733788800000,
            start="2024-12-09T23:00:00.000Z",
            end="2024-12-10T00:00:00.000Z",
            marketprice=92.85,
            unit="Eur/MWh",
            marketpriceEurocentPerKWh=9.29,
        ).model_dump()


    @pytest.mark.asyncio
    @patch("requests.get")
    async def test_update_data(self, mock_get, provider, sample_akkudoktor_1_json, cache_store):
        """Test fetching forecast from Akkudoktor."""
        # Mock response object
        mock_response = Mock()
        mock_response.status_code = 200
        mock_response.content = json.dumps(sample_akkudoktor_1_json)
        mock_get.return_value = mock_response

        cache_store.clear(clear_all=True)

        # Call the method
        ems_eos = get_ems()
        ems_eos.set_start_datetime(to_datetime("2024-12-11 00:00:00", in_timezone="Europe/Berlin"))
        await provider.update_data(force_enable=True, force_update=True)

        # Assert: Verify the result is as expected
        mock_get.assert_called_once()
        assert (
            len(provider) == 73
        )  # we have 48 datasets in the api response, we want to know 48h into the future. The data we get has already 23h into the future so we need only 25h more. 48+25=73

        # Assert we get hours price values by resampling
        np_price_array = await provider.key_to_array(
            key="elecprice_marketprice_wh",
            start_datetime=provider.ems_start_datetime,
            end_datetime=provider.end_datetime,
            fill_method="ffill",
        )
        assert len(np_price_array) == provider.total_hours

        # with open(FILE_TESTDATA_ELECPRICEAKKUDOKTOR_2_JSON, "w") as f_out:
        #    f_out.write(provider.to_json())


    @pytest.mark.asyncio
    @patch("requests.get")
    async def test_update_data_with_incomplete_forecast(self, mock_get, provider):
        """Test `_update_data` with incomplete or missing forecast data."""
        incomplete_data: dict = {"meta": {}, "values": []}
        mock_response = Mock()
        mock_response.status_code = 200
        mock_response.content = json.dumps(incomplete_data)
        mock_get.return_value = mock_response
        logger.info("The following errors are intentional and part of the test.")
        with pytest.raises(ValueError):
            await provider._update_data(force_update=True)


    @pytest.mark.parametrize(
        "status_code, exception",
        [(400, requests.exceptions.HTTPError), (500, requests.exceptions.HTTPError), (200, None)],
    )
    @patch("requests.get")
    def test_request_forecast_status_codes(
        self, mock_get, provider, sample_akkudoktor_1_json, status_code, exception
    ):
        """Test handling of various API status codes."""
        mock_response = Mock()
        mock_response.status_code = status_code
        mock_response.content = json.dumps(sample_akkudoktor_1_json)
        mock_response.raise_for_status.side_effect = (
            requests.exceptions.HTTPError if exception else None
        )
        mock_get.return_value = mock_response
        if exception:
            with pytest.raises(exception):
                provider._request_forecast()
        else:
            provider._request_forecast()


    @pytest.mark.asyncio
    @patch("requests.get")
    @patch("akkudoktoreos.core.cache.CacheFileStore")
    async def test_cache_integration(self, mock_cache, mock_get, provider, sample_akkudoktor_1_json):
        """Test caching of 8-day electricity price data."""
        # Mock response object
        mock_response = Mock()
        mock_response.status_code = 200
        mock_response.content = json.dumps(sample_akkudoktor_1_json)
        mock_get.return_value = mock_response

        # Mock cache object
        mock_cache_instance = mock_cache.return_value
        mock_cache_instance.get.return_value = None  # Simulate no cache

        await provider._update_data(force_update=True)
        mock_cache_instance.create.assert_called_once()
        mock_cache_instance.get.assert_called_once()


    @pytest.mark.asyncio
    async def test_key_to_array_resampling(self, provider):
        """Test resampling of forecast data to NumPy array."""
        await provider.update_data(force_update=True)
        array = await provider.key_to_array(
            key="elecprice_marketprice_wh",
            start_datetime=provider.ems_start_datetime,
            end_datetime=provider.end_datetime,
            fill_method="ffill",
        )
        assert isinstance(array, np.ndarray)
        assert len(array) == provider.total_hours


    # ------------------------------------------------
    # Development Akkudoktor
    # ------------------------------------------------


    @pytest.mark.skip(reason="For development only")
    def test_akkudoktor_development_forecast_data(self, provider):
        """Fetch data from real Akkudoktor server."""
        # Preset, as this is usually done by update_data()
        provider.ems_start_datetime = to_datetime("2024-10-26 00:00:00")

        akkudoktor_data = provider._request_forecast()

        with FILE_TESTDATA_ELECPRICEAKKUDOKTOR_1_JSON.open(
            "w", encoding="utf-8", newline="\n"
        ) as f_out:
            json.dump(akkudoktor_data, f_out, indent=4)
