"""
完整程序类型判定管道 — classify_program()

流程:
  1. 并行: detect_keyword() + extract_structure()
  2. keyword confidence >= 90% -> 直接输出
  3. keyword 50-89% -> 规则引擎 + 确信度计算 + 矛盾回溯
  4. keyword < 50% -> LLM 辅助 + 规则引擎验证
  5. 输出最终 JSON
"""

from __future__ import annotations

import logging
from concurrent.futures import ThreadPoolExecutor, as_completed
from typing import Any

from hina.classifier import detect_keyword
from hina.confidence import compute_confidence_v2
from hina.rule_engine.confusion_groups import resolve_confusion_pair
from hina.rule_engine.contradiction import (
    CONTRADICTION_PAIRS,
    detect_contradictions,
    resolve_contradiction,
)
from cobol_testgen import extract_structure

logger = logging.getLogger(__name__)

# 所有可尝试的混淆对名称
_PAIR_NAMES = [
    "matching_vs_keybreak",
    "dedup_vs_nodedup",
    "validation_vs_keybreak",
    "csv_merge_vs_split",
    "simple_vs_two_stage",
    "pure_vs_mixed",
    "division_50_25_100",
    "mn_output_mode",
]


# ── 内部工具 ──────────────────────────────────────────────────────────────────


def _get_best_keyword_match(matches: list) -> dict | None:
    """从 L1 关键字匹配结果中找出最佳匹配。

    Args:
        matches: detect_keyword() 返回的 list[tuple[str, float, str]]

    Returns:
        dict | None: {"category", "confidence", "keyword", "all_matches"}
    """
    if not matches:
        return None
    best = max(matches, key=lambda m: m[1])  # (category, confidence, keyword)
    return {
        "category": best[0],
        "confidence": best[1],
        "keyword": best[2],
        "all_matches": matches,
    }


def _compute_structure_match_score(structure: dict) -> int:
    """计算结构匹配度评分 (0-5)，供 compute_confidence_v2 使用。"""
    return min(
        5,
        bool(structure.get("total_paragraphs", 0))       # 有段落
        + bool(structure.get("file_count", 0))            # 有文件
        + bool(len(structure.get("decision_points", []))) # 有决策点
        + bool(structure.get("if_types", {}).get("total", 0))  # 有 IF
        + bool(structure.get("branch_tree_obj") is not None),  # 有分支树
    )


def _build_structure_summary(structure: dict) -> dict:
    """从完整结构中提取调试摘要。"""
    return {
        "paragraph_count": structure.get("total_paragraphs", 0),
        "file_count": structure.get("file_count", 0),
        "decision_count": len(structure.get("decision_points", [])),
        "has_call": structure.get("has_call", False),
        "has_divide": structure.get("has_divide", False),
    }


def _build_keyword_result_for_v2(keyword_info: dict | None) -> dict:
    """构建 compute_confidence_v2 所需的 keyword_result。"""
    if keyword_info:
        return {
            "base_confidence": keyword_info["confidence"],
            "match_count": len(keyword_info["all_matches"]),
        }
    return {"base_confidence": 0.0, "match_count": 0}


def _build_structure_features(structure: dict) -> dict:
    """构建 compute_confidence_v2 所需的 structure_features。"""
    return {
        "structure_match_score": _compute_structure_match_score(structure),
        "total_paragraphs": structure.get("total_paragraphs", 0),
    }


# ── 分路径逻辑 ────────────────────────────────────────────────────────────────


def _path_keyword_direct(
    keyword_info: dict,
    structure: dict,
) -> dict:
    """路径 A: keyword confidence >= 90%, 直接输出。

    仍会计算 v2 确信度用于最终 validation，但结果来源标记为 "keyword"。
    """
    keyword_result_v2 = _build_keyword_result_for_v2(keyword_info)
    structure_features = _build_structure_features(structure)

    v2_conf = compute_confidence_v2(
        keyword_result=keyword_result_v2,
        structure_features=structure_features,
        contradictions=[],
        resolution={"resolved_count": 0, "total_count": 0},
    )

    return {
        "category": keyword_info["category"],
        "confidence": v2_conf["confidence"],
        "needs_review": v2_conf["needs_review"],
        "method": "keyword",
        "source": "l1",
        "judgment": v2_conf["judgment"],
        "matches": keyword_info["all_matches"],
        "contradictions": [],
        "v2_confidence": v2_conf,
        "structure": _build_structure_summary(structure),
    }


def _path_rule_engine(
    keyword_info: dict | None,
    structure: dict,
) -> dict:
    """路径 B: keyword 50-89%, 规则引擎 + 确信度计算 + 矛盾回溯。

    流程:
      1. 用 structure 特征构建 features dict
      2. 遍历所有混淆组解析器, 收集 resolved_types
      3. 检测矛盾并解决
      4. 确定最终分类
      5. 计算 4 因子确信度
    """
    # 1. 结构特征直接作为 features
    features = dict(structure)

    # 2. 运行所有混淆组解析器
    resolved_types: dict[str, str] = {}
    for pair_name in _PAIR_NAMES:
        try:
            result = resolve_confusion_pair(features, pair_name)
            if result["resolved_type"] != "unknown" and result["confidence"] > 0:
                resolved_types[pair_name] = result["resolved_type"]
        except Exception as e:
            logger.debug("[pipeline] 混淆对 %s 解析异常: %s", pair_name, e)

    features["resolved_types"] = resolved_types

    # 3. 矛盾检测与解决
    contradictions = detect_contradictions(features)
    resolution_map: dict[str, Any] = {
        "resolved_count": 0,
        "total_count": len(contradictions),
    }
    for c in contradictions:
        try:
            winner = resolve_contradiction(features, c)
            if winner:
                resolution_map[c.get("name", "unknown")] = winner
                resolution_map["resolved_count"] += 1
        except Exception as e:
            logger.debug("[pipeline] 矛盾解决异常: %s", e)

    # 4. 确定最终分类与基础置信度
    final_category = "unknown"
    final_base_confidence = 0.0

    # 优先采纳 keyword 判定
    if keyword_info:
        final_category = keyword_info["category"]
        final_base_confidence = keyword_info["confidence"]

    # 如果规则引擎有更高置信度的结果, 则采纳
    best_resolved_type = None
    best_resolved_conf = 0.0
    for pair_name, rtype in resolved_types.items():
        try:
            rr = resolve_confusion_pair(features, pair_name)
            if rr["confidence"] > best_resolved_conf:
                best_resolved_conf = rr["confidence"]
                best_resolved_type = rtype
        except Exception:
            continue

    if best_resolved_type and best_resolved_conf > final_base_confidence:
        final_category = best_resolved_type
        final_base_confidence = best_resolved_conf

    # 5. 计算 4 因子确信度
    keyword_result_v2 = _build_keyword_result_for_v2(keyword_info)
    keyword_result_v2["base_confidence"] = final_base_confidence

    structure_features = _build_structure_features(structure)

    v2_confidence = compute_confidence_v2(
        keyword_result=keyword_result_v2,
        structure_features=structure_features,
        contradictions=contradictions,
        resolution=resolution_map,
    )

    # 6. 组装结果
    return {
        "category": final_category,
        "confidence": v2_confidence["confidence"],
        "needs_review": v2_confidence["needs_review"],
        "method": "rule_engine",
        "source": "pipeline",
        "judgment": v2_confidence["judgment"],
        "matches": keyword_info["all_matches"] if keyword_info else [],
        "contradictions": contradictions,
        "contradiction_resolution": resolution_map,
        "resolved_types": resolved_types,
        "v2_confidence": v2_confidence,
        "structure": _build_structure_summary(structure),
    }


def _path_llm_assisted(
    keyword_info: dict | None,
    structure: dict,
    llm: Any,
) -> dict:
    """路径 C: keyword < 50%, LLM 辅助 + 规则引擎验证。

    流程:
      1. 调用 classify_with_llm 获取 LLM 分类
      2. 规则引擎验证 LLM 结果
      3. 矛盾检测
      4. 确信度计算
    """
    from hina.hina_agent import classify_with_llm

    # 1. LLM 分类
    llm_result = classify_with_llm(structure, llm)
    llm_category = llm_result.get("category", "unknown")
    llm_confidence = llm_result.get("confidence", 0.5)

    # 2. 规则引擎验证 LLM 分类
    features = dict(structure)
    validated_category = llm_category
    validated_confidence = llm_confidence

    for pair_name in _PAIR_NAMES:
        try:
            pair_result = resolve_confusion_pair(features, pair_name)
            if (pair_result["resolved_type"] != "unknown"
                    and pair_result["confidence"] > validated_confidence):
                validated_category = pair_result["resolved_type"]
                validated_confidence = pair_result["confidence"]
        except Exception:
            continue

    # 3. 矛盾检测
    resolved_types: dict[str, str] = {}
    for pair_name in _PAIR_NAMES:
        try:
            rr = resolve_confusion_pair(features, pair_name)
            if rr["resolved_type"] != "unknown":
                resolved_types[pair_name] = rr["resolved_type"]
        except Exception:
            continue

    features["resolved_types"] = resolved_types
    contradictions = detect_contradictions(features)

    # 4. 确信度计算
    keyword_result_v2 = _build_keyword_result_for_v2(keyword_info)
    keyword_result_v2["base_confidence"] = validated_confidence

    structure_features = _build_structure_features(structure)

    v2_confidence = compute_confidence_v2(
        keyword_result=keyword_result_v2,
        structure_features=structure_features,
        contradictions=contradictions,
        resolution={"resolved_count": 0, "total_count": len(contradictions)},
    )

    return {
        "category": validated_category,
        "confidence": v2_confidence["confidence"],
        "needs_review": v2_confidence["needs_review"],
        "method": "llm",
        "source": "pipeline",
        "judgment": v2_confidence["judgment"],
        "matches": keyword_info["all_matches"] if keyword_info else [],
        "contradictions": contradictions,
        "llm_raw": llm_result,
        "v2_confidence": v2_confidence,
        "structure": _build_structure_summary(structure),
    }


# ── 主入口 ────────────────────────────────────────────────────────────────────


def classify_program(cobol_source: str, llm: Any = None) -> dict:
    """完整程序类型判定管道。

    流程:
      1. 并行: detect_keyword() + extract_structure()
      2. keyword confidence >= 90% -> 直接输出
      3. keyword 50-89% -> 规则引擎 + 确信度计算 + 矛盾回溯
      4. keyword < 50% -> LLM 辅助 + 规则引擎验证
      5. 输出最终 JSON

    Args:
        cobol_source: COBOL 程序源码文本。
        llm: 可选的 LLM 客户端实例。
             在 keyword confidence < 50% 路径中用于 LLM 辅助分类。
             若为 None 且 keyword < 50%, 则使用规则引擎兜底。

    Returns:
        dict: {
            "category": str,           # 程序分类名称
            "confidence": float,       # 综合确信度 (0.0 ~ 1.0)
            "needs_review": bool,      # 是否需要人工审核
            "method": str,             # "keyword" | "rule_engine" | "llm"
            "source": str,             # 结果来源: "l1" / "pipeline"
            "judgment": str,           # auto / review / manual / impossible
            "matches": list,           # L1 关键字匹配详情
            "contradictions": list,    # 矛盾列表
            "v2_confidence": dict,     # 4 因子确信度详情
            "structure": dict,         # 结构特征摘要（调试用）
        }

    Raises:
        ValueError: 如果 cobol_source 为空或无效。
    """
    if not cobol_source or not cobol_source.strip():
        return {
            "category": "unknown",
            "confidence": 0.0,
            "needs_review": True,
            "method": "none",
            "source": "error",
            "judgment": "impossible",
            "matches": [],
            "contradictions": [],
            "v2_confidence": {},
            "structure": {},
        }

    # ── 第 1 步: 并行执行 keyword 检测和结构提取 ──
    keyword_matches: list = []
    structure: dict = {}

    with ThreadPoolExecutor(max_workers=2) as executor:
        future_keyword = executor.submit(detect_keyword, cobol_source)
        future_structure = executor.submit(extract_structure, cobol_source)

        for future in as_completed([future_keyword, future_structure]):
            if future == future_keyword:
                try:
                    keyword_matches = future.result()
                except Exception as e:
                    logger.warning("[pipeline] detect_keyword 失败: %s", e)
            elif future == future_structure:
                try:
                    structure = future.result()
                except Exception as e:
                    logger.warning("[pipeline] extract_structure 失败: %s", e)

    # ── 第 2 步: 分析关键字结果, 确定路径 ──
    keyword_info = _get_best_keyword_match(keyword_matches)
    max_keyword_confidence = keyword_info["confidence"] if keyword_info else 0.0

    logger.info(
        "[pipeline] keyword matches=%d, max_confidence=%.2f, paragraphs=%d, files=%d",
        len(keyword_matches),
        max_keyword_confidence,
        structure.get("total_paragraphs", 0),
        structure.get("file_count", 0),
    )

    # ── 第 3 步: 根据确信度分路径 ──

    # 路径 A: keyword >= 90% -> 直接输出
    if max_keyword_confidence >= 0.90:
        logger.info("[pipeline] 路径 A: keyword 高确信度 (%.2f)", max_keyword_confidence)
        return _path_keyword_direct(keyword_info, structure)

    # 路径 B: keyword 50-89% -> 规则引擎
    if max_keyword_confidence >= 0.50:
        logger.info("[pipeline] 路径 B: keyword 中确信度 (%.2f) -> 规则引擎", max_keyword_confidence)
        return _path_rule_engine(keyword_info, structure)

    # 路径 C: keyword < 50% -> LLM 辅助
    if llm is not None:
        logger.info("[pipeline] 路径 C: keyword 低确信度 (%.2f) -> LLM 辅助", max_keyword_confidence)
        return _path_llm_assisted(keyword_info, structure, llm)

    # LLM 不可用: 使用规则引擎兜底
    logger.info("[pipeline] 路径 C(fallback): keyword 低确信度 (%.2f) -> 规则引擎兜底", max_keyword_confidence)
    result = _path_rule_engine(keyword_info, structure)
    result["method"] = "rule_engine_fallback"
    return result