"""训练和验证结构化 ML 模型。"""

import argparse
import json

import pandas as pd

from defect_analysis.ml.datasets import build_supervised_dataset
from defect_analysis.ml.features import build_feature_frame
from defect_analysis.ml.model_bundle import (
    create_model_bundle,
    load_model_bundle,
    predict_with_bundle,
    save_model_bundle,
)
from defect_analysis.ml.model_registry import detect_optional_model_backends
from defect_analysis.ml.predict import predict_key_factors
from defect_analysis.ml.tabular_models import train_tabular_model
from defect_analysis.schemas import normalize_defect_schema


def load_defect_csv(csv_path):
    try:
        return normalize_defect_schema(pd.read_csv(csv_path, parse_dates=["timestamp"], encoding="utf-8-sig"))
    except (ValueError, KeyError) as exc:
        raise SystemExit(f"CSV 读取失败: 请确保文件包含 timestamp 列，格式为 utf-8 — {exc}")


def build_bundle_report(bundle):
    """生成可序列化的模型训练报告。"""
    return {
        "bundle_version": bundle["bundle_version"],
        "created_at": bundle["created_at"],
        "model_name": bundle["model_name"],
        "target": bundle["target"],
        "feature_count": len(bundle["feature_columns"]),
        "metrics": bundle["metrics"],
        "validation_metrics": bundle["validation_metrics"],
        "feature_importance": bundle["feature_importance"],
        "optional_backends": bundle["optional_backends"],
    }


def main():
    parser = argparse.ArgumentParser(description="训练/运行不良分析 ML 模型")
    parser.add_argument("--csv", default="defect_data.csv")
    parser.add_argument(
        "--model",
        default="random_forest",
        choices=["random_forest", "logistic_regression", "isolation_forest", "xgboost", "lightgbm"],
    )
    parser.add_argument("--target-defect-type")
    parser.add_argument("--target-severity")
    parser.add_argument("--top-n", type=int, default=10)
    parser.add_argument("--show-backends", action="store_true")
    parser.add_argument("--save-model", help="训练后保存监督模型包到指定路径，仅支持监督模型")
    parser.add_argument("--model-path", help="批量打分时加载的模型包路径")
    parser.add_argument("--predict-csv", help="使用已保存模型包对新 CSV 批量打分")
    parser.add_argument("--output-csv", help="批量打分结果导出路径，默认打印前 20 行")
    parser.add_argument("--report-json", help="导出训练评估报告 JSON")
    args = parser.parse_args()

    if args.show_backends:
        print(detect_optional_model_backends())

    if args.predict_csv:
        model_path = args.model_path or args.save_model
        if not model_path:
            raise SystemExit("--predict-csv 需要通过 --model-path 指定已保存的模型包路径")
        bundle = load_model_bundle(model_path)
        scored = predict_with_bundle(bundle, load_defect_csv(args.predict_csv))
        if args.output_csv:
            scored.to_csv(args.output_csv, index=False, encoding="utf-8-sig")
            print(f"批量打分完成: {args.output_csv}，样本数={len(scored)}")
        else:
            columns = ["defect_id", "panel_id", "defect_type", "severity", "ml_prediction", "ml_probability", "model_name"]
            print(scored[[col for col in columns if col in scored.columns]].head(20).to_string(index=False))
        return

    df = load_defect_csv(args.csv)
    if args.model == "isolation_forest":
        X = build_feature_frame(df)
        result = train_tabular_model("isolation_forest", X)
        scores = pd.Series(result["anomaly_scores"])
        print(f"IsolationForest 完成: 样本数={len(scores)}, 最高异常分={scores.max():.4f}, 平均异常分={scores.mean():.4f}")
        return

    if args.save_model:
        bundle = create_model_bundle(
            df,
            model_name=args.model,
            target_defect_type=args.target_defect_type,
            target_severity=args.target_severity,
        )
        save_model_bundle(bundle, args.save_model)
        result = {"metrics": bundle["metrics"]}
        print(f"模型包已保存: {args.save_model}")
        if args.report_json:
            with open(args.report_json, "w", encoding="utf-8") as f:
                json.dump(build_bundle_report(bundle), f, ensure_ascii=False, indent=2)
            print(f"训练评估报告已保存: {args.report_json}")
    else:
        X, y = build_supervised_dataset(
            df,
            target_defect_type=args.target_defect_type,
            target_severity=args.target_severity,
        )
        result = train_tabular_model(args.model, X, y)
    print(f"{args.model} 训练完成: {result['metrics']}")

    predictions = predict_key_factors(
        df,
        target_defect_type=args.target_defect_type,
        target_severity=args.target_severity,
        model_name=args.model,
        top_n=args.top_n,
    )
    if predictions.empty:
        print("未找到关键因子候选。")
    else:
        columns = ["维度", "因子值", "目标数", "异常倍数", "关键因子得分", "ml_probability", "model_name"]
        print(predictions[columns].to_string(index=False))


if __name__ == "__main__":
    main()