import json
from io import BytesIO
from pathlib import Path
from typing import Any
from unittest.mock import patch

import pytest
from pydantic import ValidationError
from pypdf import PdfReader

from akkudoktoreos.config.config import ConfigEOS
from akkudoktoreos.core.cache import CacheEnergyManagementStore
from akkudoktoreos.core.coreabc import get_ems
from akkudoktoreos.optimization.genetic.genetic import GeneticOptimization
from akkudoktoreos.optimization.genetic.geneticparams import (
    GeneticOptimizationParameters,
)
from akkudoktoreos.optimization.genetic.geneticsolution import GeneticSolution
from akkudoktoreos.optimization.genetic.geneticvisualize import (
    genetic_prepare_visualize,
)
from akkudoktoreos.utils.datetimeutil import to_datetime

ems_eos = get_ems(init=True) # init once

DIR_TESTDATA = Path(__file__).parent / "testdata" / "genetic"


def compare_dict(actual: dict[str, Any], expected: dict[str, Any]):
    assert set(actual) == set(expected)

    for key, value in expected.items():
        if isinstance(value, dict):
            assert isinstance(actual[key], dict)
            compare_dict(actual[key], value)
        elif isinstance(value, list):
            assert isinstance(actual[key], list)
            assert actual[key] == pytest.approx(value)
        else:
            assert actual[key] == pytest.approx(value)

@pytest.mark.asyncio
@pytest.mark.parametrize(
    "fn_in, fn_out, ngen, break_even",
    [
        ("optimize_input_1.json", "optimize_result_1.json", 3, 0),
        ("optimize_input_2.json", "optimize_result_2.json", 3, 0),
        ("optimize_input_2.json", "optimize_result_2_full.json", 400, 0),
        ("optimize_input_1.json", "optimize_result_1_be.json", 3, 1),
        ("optimize_input_2.json", "optimize_result_2_be.json", 3, 1),
    ],
)
async def test_optimize(
    fn_in: str,
    fn_out: str,
    ngen: int,
    break_even: int,
    config_eos: ConfigEOS,
    is_finalize: bool,
):
    """Test optimize_ems."""
    # Test parameters
    fixed_start_hour = 10
    fixed_seed = 42

    # Assure configuration holds the correct values
    config_eos.merge_settings_from_dict(
        {
            "prediction": {
                "hours": 48
            },
            "optimization": {
                "algorithm": "GENETIC",
                "genetic": {
                    "horizon_hours": 48,
                    "individuals": 300,
                    "generations": 10,
                    "penalties": {
                        "ev_soc_miss": 10,
                        "ac_charge_break_even": break_even,
                    }
                }
            },
            "devices": {
                "max_electric_vehicles": 1,
                "electric_vehicles": [
                    {
                        "charge_rates": [0.0, 0.375, 0.5, 0.625, 0.75, 0.875, 1.0],
                    }
                ],
             }
         }
    )

    # Load input and output data
    parameter_file = DIR_TESTDATA / fn_in
    with parameter_file.open("r") as f_in:
        input_data = GeneticOptimizationParameters(**json.load(f_in))

    # Fake energy management run start datetime
    ems_eos.set_start_datetime(to_datetime().set(hour=fixed_start_hour))

    # Throw away any cached results of the last energy management run.
    CacheEnergyManagementStore().clear()

    genetic_optimization = GeneticOptimization(fixed_seed=fixed_seed)

    # Activate with pytest --finalize
    if ngen > 10 and not is_finalize:
        pytest.skip()

    # Call the optimization function
    genetic_solution = genetic_optimization.optimize_ems(
        parameters=input_data, start_hour=fixed_start_hour, ngen=ngen
    )

    # Write test output to file, so we can take it as new data on intended change
    TESTDATA_FILE = DIR_TESTDATA / f"new_{fn_out}"
    with TESTDATA_FILE.open("w", encoding="utf-8", newline="\n") as f_out:
        f_out.write(genetic_solution.model_dump_json(indent=4, exclude_unset=True))

    solution_file = DIR_TESTDATA / fn_out
    # In case a new test case is added, we don't want to fail here, so the new output is written
    # to disk before
    try:
        with solution_file.open("r") as f_out:
            expected_data = json.load(f_out)
            expected_result = GeneticSolution(**expected_data)
    except ValidationError:
        # Expected genetic solution data does not fit to GeneticSolution data schema
        # Possibly the GeneticSolution class changed.
        pytest.fail(
            f"ValidationError: Can not load expected solution from {solution_file}\n"
            f"cp {TESTDATA_FILE} {solution_file}\n"
        )
    except FileNotFoundError:
        # Should not happen
        pytest.fail(
            f"FileNotFoundError: Can not load expected solution from {solution_file}\n"
            f"cp {TESTDATA_FILE} {solution_file}\n"
        )

    assert genetic_solution.result.Gesamtbilanz_Euro == pytest.approx(
        expected_result.result.Gesamtbilanz_Euro
    )

    # Assert that the output contains all expected entries.
    # This does not assert that the optimization always gives the same result!
    # Reproducibility and mathematical accuracy should be tested on the level of individual components.
    compare_dict(genetic_solution.model_dump(), expected_result.model_dump())

    # Check the correct generic optimization solution is created
    optimization_solution = await genetic_solution.optimization_solution()
    # @TODO

    # Check the correct generic energy management plan is created
    plan = genetic_solution.energy_management_plan()
    # @TODO

    # Check visualization works
    pdf = genetic_prepare_visualize(
        solution=genetic_solution,
    )
    assert pdf.startswith(b"%PDF-")

    reader = PdfReader(BytesIO(pdf))
    assert len(reader.pages) == 6


    # Everything passed, remove generated files
    TESTDATA_FILE.unlink()