from __future__ import annotations

import argparse
import json
import sys
from pathlib import Path

PROJECT_ROOT = Path(__file__).resolve().parents[1]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from app.core.config import settings
from app.core.bootstrap import build_intent_registry
from app.services.classifier import BertIntentClassifier
from app.services.router import build_matcher_pipeline


DEFAULT_MODEL_DIR = PROJECT_ROOT / "models/local_bert_intent"
DEFAULT_LABEL_MAP = DEFAULT_MODEL_DIR / "label_map.json"


def build_classifier(threshold: float, top_k: int) -> BertIntentClassifier:
    return BertIntentClassifier(
        model_path=str(DEFAULT_MODEL_DIR),
        threshold=threshold,
        label_map_path=str(DEFAULT_LABEL_MAP),
        fallback=None,
        top_k=top_k,
    )


def predict_once(text: str, threshold: float, top_k: int) -> dict[str, object]:
    classifier = build_classifier(threshold=threshold, top_k=top_k)
    registry = build_intent_registry()
    intents = registry.list()
    result = classifier.predict(text, intents)
    matcher = build_matcher_pipeline(
        registry,
        ["classifier"],
        classifier=classifier,
        route_to_cloud_threshold=settings.local_route_to_cloud_threshold,
        clarify_margin_threshold=settings.local_clarify_margin_threshold,
    )
    route_result = matcher.match(text)
    fusion_stage = next((stage for stage in reversed(route_result.debug.stages) if stage.stage == "fusion"), None)
    return {
        "text": text,
        "predicted_intent": result.intent.intent_id if result.intent is not None else None,
        "score": round(result.score, 4),
        "model_name": result.model_name,
        "backend": result.backend_name,
        "raw_label": result.raw_label,
        "fallback_reason": result.fallback_reason,
        "error_message": result.error_message,
        "decision": route_result.debug.decision,
        "decision_reason": route_result.debug.decision_reason,
        "confidence_grade": route_result.debug.confidence_grade,
        "unknown_detected": route_result.debug.unknown_detected,
        "fusion_top_score": round(fusion_stage.score, 4) if fusion_stage is not None else None,
        "top_candidates": [
            {"intent_id": intent.intent_id, "score": round(score, 4)}
            for intent, score in (result.candidates or [])
        ],
    }


def interactive_loop(threshold: float, top_k: int) -> None:
    print("本地 BERT 意图测试已启动，输入一句话直接查看预测结果，输入 exit 退出。")
    while True:
        try:
            text = input("\n请输入问题> ").strip()
        except EOFError:
            print()
            break
        if not text:
            continue
        if text.lower() in {"exit", "quit", "q"}:
            break
        result = predict_once(text, threshold=threshold, top_k=top_k)
        print(json.dumps(result, ensure_ascii=False, indent=2))


def main() -> None:
    parser = argparse.ArgumentParser(description="本地 BERT 意图识别测试脚本")
    parser.add_argument("--text", type=str, default="", help="单次测试文本")
    parser.add_argument("--threshold", type=float, default=0.0, help="BERT 置信度阈值")
    parser.add_argument("--top-k", type=int, default=3, help="返回候选数量")
    args = parser.parse_args()

    if args.text.strip():
        print(json.dumps(predict_once(args.text.strip(), threshold=args.threshold, top_k=args.top_k), ensure_ascii=False, indent=2))
        return
    interactive_loop(threshold=args.threshold, top_k=args.top_k)


if __name__ == "__main__":
    main()