import json

import pandas as pd

from scripts.run_multi_factor_finetune_report import (
    _hold_biases,
    _score_candidate,
    evaluate_configs,
    generate_beam_refinement_configs,
    generate_finetune_configs,
    load_seed_config,
)


def test_protected_metrics_ranking_preserves_signal_quality_before_accuracy():
    high_accuracy_with_precision_loss = _score_candidate(
        {
            "accuracy_delta_pp": 4.0,
            "direction_accuracy_delta_pp": -0.1,
            "buy_precision_delta_pp": -0.1,
            "sell_precision_delta_pp": -0.1,
        },
        {"accuracy": 44.0},
        1.0,
        ranking_strategy="protected_metrics_first",
        min_accuracy_delta_pp=1.0,
        min_buy_precision_delta_pp=0.0,
        min_direction_accuracy_delta_pp=0.0,
        max_sell_precision_drop_pp=0.0,
    )
    protected_signal_quality = _score_candidate(
        {
            "accuracy_delta_pp": 0.5,
            "direction_accuracy_delta_pp": 0.1,
            "buy_precision_delta_pp": 0.1,
            "sell_precision_delta_pp": 0.1,
        },
        {"accuracy": 40.5},
        1.0,
        ranking_strategy="protected_metrics_first",
        min_accuracy_delta_pp=1.0,
        min_buy_precision_delta_pp=0.0,
        min_direction_accuracy_delta_pp=0.0,
        max_sell_precision_drop_pp=0.0,
    )

    assert protected_signal_quality > high_accuracy_with_precision_loss


def test_protected_metrics_ranking_improves_weakest_gate_before_pass_count():
    imbalanced = _score_candidate(
        {
            "accuracy_delta_pp": 3.0,
            "direction_accuracy_delta_pp": 0.5,
            "buy_precision_delta_pp": 1.1,
            "sell_precision_delta_pp": -1.5,
        },
        {"accuracy": 43.0},
        1.0,
        ranking_strategy="protected_metrics_first",
        min_accuracy_delta_pp=1.0,
        min_buy_precision_delta_pp=1.0,
        min_direction_accuracy_delta_pp=0.0,
        max_sell_precision_drop_pp=0.0,
    )
    balanced = _score_candidate(
        {
            "accuracy_delta_pp": 2.0,
            "direction_accuracy_delta_pp": 0.1,
            "buy_precision_delta_pp": 0.4,
            "sell_precision_delta_pp": -0.2,
        },
        {"accuracy": 42.0},
        1.0,
        ranking_strategy="protected_metrics_first",
        min_accuracy_delta_pp=1.0,
        min_buy_precision_delta_pp=1.0,
        min_direction_accuracy_delta_pp=0.0,
        max_sell_precision_drop_pp=0.0,
    )

    assert balanced > imbalanced


def test_protected_metrics_ranking_rejects_precision_gain_from_low_coverage():
    common = {
        "accuracy_delta_pp": 1.2,
        "direction_accuracy_delta_pp": 0.2,
        "buy_precision_delta_pp": 1.2,
        "sell_precision_delta_pp": 0.2,
    }
    low_coverage = _score_candidate(
        common,
        {"accuracy": 41.2},
        1.0,
        signal_ratio=0.5,
        ranking_strategy="protected_metrics_first",
        min_accuracy_delta_pp=1.0,
        min_buy_precision_delta_pp=1.0,
        min_direction_accuracy_delta_pp=0.0,
        max_sell_precision_drop_pp=0.0,
        min_signal_ratio=0.7,
    )
    healthy_coverage = _score_candidate(
        common,
        {"accuracy": 41.2},
        1.0,
        signal_ratio=0.8,
        ranking_strategy="protected_metrics_first",
        min_accuracy_delta_pp=1.0,
        min_buy_precision_delta_pp=1.0,
        min_direction_accuracy_delta_pp=0.0,
        max_sell_precision_drop_pp=0.0,
        min_signal_ratio=0.7,
    )

    assert healthy_coverage > low_coverage


def test_load_seed_config_reads_golden_weights(tmp_path):
    seed_json = tmp_path / "seed.json"
    seed_json.write_text(
        json.dumps(
            {
                "generated_at": "2026-05-23T00:00:00+00:00",
                "result": {
                    "golden_config": {
                        "config": {
                            "weights": {
                                "oldwang_trend": 0.01,
                                "volume_spike": 0.08,
                            }
                        }
                    }
                },
            }
        )
    )

    weights, payload = load_seed_config(seed_json)

    assert weights == {"oldwang_trend": 0.01, "volume_spike": 0.08}
    assert payload["generated_at"] == "2026-05-23T00:00:00+00:00"


def test_load_seed_config_can_use_top_overall_as_explicit_research_seed(tmp_path):
    seed_json = tmp_path / "failed_search.json"
    seed_json.write_text(
        json.dumps(
            {
                "result": {
                    "golden_config": None,
                    "top_overall": [{"config": {"weights": {"trend": 0.02}}}],
                }
            }
        )
    )

    weights, payload = load_seed_config(seed_json, selection="top_overall")

    assert weights == {"trend": 0.02}
    assert payload["_seed_selection"] == {
        "requested": "top_overall",
        "selected_from": "top_overall[0]",
        "research_seed_only": True,
    }


def test_generate_finetune_configs_keeps_every_selected_weight_nonzero():
    configs = generate_finetune_configs(
        {"oldwang_trend": 0.01, "volume_spike": 0.08, "trust_flow": 0.02},
        delta_values=[-0.01, 0.0, 0.01],
        scale_values=[0.9, 1.0, 1.1],
        random_configs=20,
        max_configs=30,
        weight_step=0.005,
        min_weight=0.005,
        max_weight=0.10,
        random_seed=7,
    )

    assert configs[0].weights == {"oldwang_trend": 0.01, "volume_spike": 0.08, "trust_flow": 0.02}
    assert 1 < len(configs) <= 30
    assert all(set(config.weights) == {"oldwang_trend", "volume_spike", "trust_flow"} for config in configs)
    assert all(all(weight > 0 for weight in config.weights.values()) for config in configs)
    assert all(all(0.005 <= weight <= 0.10 for weight in config.weights.values()) for config in configs)


def test_generate_finetune_configs_respects_zero_weight_limit():
    configs = generate_finetune_configs(
        {"trend": 0.0, "volume": 0.25, "chip": 0.0, "risk": 0.5},
        delta_values=[-0.01, 0.0, 0.01],
        scale_values=[1.0],
        random_configs=20,
        max_configs=30,
        weight_step=0.01,
        min_weight=0.0,
        max_weight=1.0,
        random_seed=7,
        max_zero_factor_weights=1,
    )

    assert configs
    assert all(
        sum(1 for weight in cfg.weights.values() if abs(weight) <= 1e-12) <= 1
        for cfg in configs
    )


def test_generate_finetune_configs_lifts_excess_seed_zeros_before_random_search():
    configs = generate_finetune_configs(
        {"a": 0.0, "b": 0.0, "c": 0.0, "d": 0.0, "e": 0.5},
        delta_values=[-0.01, 0.0, 0.01],
        scale_values=[1.0],
        random_configs=20,
        max_configs=30,
        weight_step=0.01,
        min_weight=0.0,
        max_weight=1.0,
        random_seed=7,
        max_zero_factor_weights=1,
    )

    assert len(configs) > 5
    assert all(sum(1 for weight in cfg.weights.values() if weight == 0.0) <= 1 for cfg in configs)
    assert configs[0].weights == {"a": 0.01, "b": 0.01, "c": 0.01, "d": 0.0, "e": 0.5}


def test_generate_finetune_configs_uses_local_mutations_for_many_low_weights():
    seed = {f"factor_{idx}": 0.01 for idx in range(30)}
    configs = generate_finetune_configs(
        seed,
        delta_values=[-0.01, 0.0, 0.01],
        scale_values=[1.0],
        random_configs=100,
        max_configs=120,
        weight_step=0.01,
        min_weight=0.0,
        max_weight=1.0,
        random_seed=7,
        max_zero_factor_weights=3,
    )

    assert len(configs) >= 100
    assert all(sum(1 for weight in cfg.weights.values() if weight == 0.0) <= 3 for cfg in configs)


def test_generate_beam_refinement_configs_uses_cent_step_and_zero_limit():
    rows = []
    for idx in range(12):
        bullish = idx % 2 == 0
        rows.append(
            {
                "stock": "2330",
                "date": f"2025-04-{idx + 1:02d}",
                "y_true": 1 if bullish else -1,
                "base_pred": 0,
                "p_buy": 0.49,
                "p_hold": 0.52,
                "p_sell": 0.49,
                "factor__trend": 2.0 if bullish else -2.0,
                "factor__volume": 0.0,
            }
        )

    configs = generate_beam_refinement_configs(
        {"trend": 0.0, "volume": 0.25},
        events=pd.DataFrame(rows),
        optimize_ratio=0.5,
        weight_step=0.01,
        min_weight=0.0,
        max_weight=1.0,
        beam_width=3,
        beam_passes=1,
        max_zero_factor_weights=1,
    )

    assert configs
    assert all(
        all(abs((weight * 100) - round(weight * 100)) < 1e-9 for weight in cfg.weights.values())
        for cfg in configs
    )
    assert all(
        sum(1 for weight in cfg.weights.values() if abs(weight) <= 1e-12) <= 1
        for cfg in configs
    )


def test_generate_beam_refinement_configs_searches_hold_bias_threshold():
    events = pd.DataFrame(
        [
            {
                "stock": "2330",
                "date": f"2025-05-{idx + 1:02d}",
                "y_true": 0,
                "base_pred": 1,
                "p_buy": 0.51,
                "p_hold": 0.50,
                "p_sell": 0.0,
                "factor__trend": 0.0,
            }
            for idx in range(6)
        ]
    )

    configs = generate_beam_refinement_configs(
        {"trend": 0.01},
        events=events,
        optimize_ratio=0.5,
        weight_step=0.01,
        min_weight=0.0,
        max_weight=0.01,
        beam_width=2,
        beam_passes=1,
        max_zero_factor_weights=1,
        hold_bias_values=[0.0, 0.02],
    )

    assert {cfg.hold_bias for cfg in configs} == {0.0, 0.02}


def test_hold_bias_values_must_be_inside_probability_range():
    assert _hold_biases("0.0,0.05") == [0.0, 0.05]

    try:
        _hold_biases("1.01")
    except ValueError as exc:
        assert "inside [0, 1]" in str(exc)
    else:
        raise AssertionError("Expected invalid hold bias to fail")


def test_evaluate_configs_reports_current_seed_and_best_separately():
    rows = []
    for idx in range(12):
        bullish = idx % 2 == 0
        rows.append(
            {
                "stock": "2330" if idx < 6 else "2317",
                "date": f"2025-04-{idx + 1:02d}",
                "y_true": 1 if bullish else -1,
                "base_pred": 0,
                "p_buy": 0.49,
                "p_hold": 0.52,
                "p_sell": 0.49,
                "factor__trend": 2.0 if bullish else -2.0,
                "factor__volume": 0.0,
            }
        )
    configs = generate_finetune_configs(
        {"trend": 0.01, "volume": 0.01},
        delta_values=[0.01],
        scale_values=[1.0],
        random_configs=0,
        max_configs=10,
        weight_step=0.005,
        min_weight=0.005,
        max_weight=0.10,
        random_seed=1,
    )

    result = evaluate_configs(
        pd.DataFrame(rows),
        configs,
        optimize_ratio=0.5,
        min_accuracy_delta_pp=0.0,
        min_buy_precision_delta_pp=0.0,
        min_signal_ratio=0.5,
        max_buy_count_ratio=None,
        max_sell_precision_drop_pp=None,
        max_zero_factor_weights=None,
        top_n=5,
    )

    assert result["baseline"]["validation"]["accuracy"] == 0.0
    assert result["ranking_source"] == "tune"
    assert result["seed_config"]["name"] == "seed"
    assert result["seed_config"]["validation"]["metrics"]["accuracy"] == 0.0
    assert result["golden_config"]["validation"]["metrics"]["accuracy"] == 100.0
    assert result["golden_config"]["config"]["weights"]["trend"] == 0.02
    assert result["golden_config"]["gate"]["checks"]["all_factor_weights_nonzero"] is True
    assert result["best_vs_seed_deltas"]["accuracy_delta_pp"] == 100.0


def test_evaluate_configs_reports_per_stock_for_top_candidate_without_golden():
    rows = []
    for idx in range(12):
        bullish = idx % 2 == 0
        rows.append(
            {
                "stock": "2330" if idx < 6 else "2317",
                "date": f"2025-05-{idx + 1:02d}",
                "y_true": 1 if bullish else -1,
                "base_pred": 0,
                "p_buy": 0.49,
                "p_hold": 0.52,
                "p_sell": 0.49,
                "factor__trend": 2.0 if bullish else -2.0,
                "factor__volume": 0.0,
            }
        )
    configs = generate_finetune_configs(
        {"trend": 0.01, "volume": 0.01},
        delta_values=[0.01],
        scale_values=[1.0],
        random_configs=0,
        max_configs=10,
        weight_step=0.005,
        min_weight=0.005,
        max_weight=0.10,
        random_seed=1,
    )

    result = evaluate_configs(
        pd.DataFrame(rows),
        configs,
        optimize_ratio=0.5,
        min_accuracy_delta_pp=101.0,
        min_buy_precision_delta_pp=0.0,
        min_signal_ratio=0.5,
        max_buy_count_ratio=None,
        max_sell_precision_drop_pp=None,
        max_zero_factor_weights=None,
        top_n=5,
    )

    assert result["golden_config"] is None
    assert result["per_stock_validation_config_name"] == "candidate_00001"
    assert result["per_stock_validation_config_passed"] is False
    assert set(result["per_stock_validation"]) == {"2317"}


def test_evaluate_configs_can_retain_all_ranked_combinations():
    rows = [
        {
            "stock": "2330",
            "date": f"2025-06-{idx + 1:02d}",
            "y_true": 1 if idx % 2 == 0 else -1,
            "base_pred": 0,
            "p_buy": 0.49,
            "p_hold": 0.52,
            "p_sell": 0.49,
            "factor__trend": 2.0 if idx % 2 == 0 else -2.0,
        }
        for idx in range(12)
    ]
    configs = generate_finetune_configs(
        {"trend": 0.01},
        delta_values=[0.01, 0.02],
        scale_values=[1.0],
        random_configs=0,
        max_configs=10,
        weight_step=0.01,
        min_weight=0.01,
        max_weight=0.10,
        random_seed=1,
    )

    result = evaluate_configs(
        pd.DataFrame(rows),
        configs,
        optimize_ratio=0.5,
        min_accuracy_delta_pp=0.0,
        min_buy_precision_delta_pp=0.0,
        min_signal_ratio=0.5,
        max_buy_count_ratio=None,
        max_sell_precision_drop_pp=None,
        max_zero_factor_weights=0,
        top_n=1,
        retain_all_configs=True,
    )

    assert len(result["all_configs"]) == len(configs)
    assert len(result["top_overall"]) == 1