from __future__ import annotations

import json
from typing import Any, Dict, List

from licensing_repo import (
    list_region_theme_options,
    load_theme_payload,
)
from lawrisk_service import ChatClient


def _compose_prompt(payload: Dict[str, Any]) -> str:
    """Build a natural-language prompt snippet from structured payload."""
    region = payload.get("region", {})
    theme = payload.get("theme", {})
    permits = payload.get("permits", [])

    lines: List[str] = []
    lines.append(f"地区：{region.get('name', '')}")
    lines.append(f"主题事项：{theme.get('name', '')}")

    for permit in permits:
        pname = permit.get("name", "")
        lines.append(f"许可事项：{pname}")
        permit_scopes = permit.get("business_scopes", [])
        if permit_scopes:
            scope_text = "；".join(
                scope.get("description", "") for scope in permit_scopes if scope.get("description")
            )
            if scope_text:
                lines.append(f"  经营范围：{scope_text}")
        risks = permit.get("risks", [])
        for idx, risk in enumerate(risks, start=1):
            detail_parts = []
            if risk.get("risk_content"):
                detail_parts.append(f"风险提示：{risk['risk_content']}")
            if risk.get("legal_basis"):
                detail_parts.append(f"法律依据：{risk['legal_basis']}")
            if risk.get("document_no"):
                detail_parts.append(f"文号：{risk['document_no']}")
            if risk.get("summary"):
                detail_parts.append(f"摘要：{risk['summary']}")
            if detail_parts:
                lines.append(f"  风险{idx}：" + "；".join(detail_parts))
    return "\n".join(lines)


def _select_theme_options(query: str, catalog: List[Dict[str, str]]) -> List[str]:
    """Use LLM to choose relevant region-theme option ids."""
    if not catalog:
        return []
    lines = [f"{item['option_id']}\t{item['display_name']}" for item in catalog]
    options_block = "\n".join(lines)

    system_msg = (
        "你是政务事项检索助手。根据用户提供的问题，"
        "从给定的地区-主题列表中选择最相关的主题事项，返回其 option_id。"
        "输出 JSON 数组，例如: [\"region_uuid:theme_uuid\"]."
    )
    user_msg = (
        f"用户问题: {query}\n\n"
        "候选主题列表 (option_id<tab>地区·主题):\n"
        f"{options_block}\n\n"
        "请仅输出 JSON 数组，内容为选择的 option_id。如果没有匹配，请输出 []."
    )
    chat = ChatClient()
    content = chat.chat(
        [
            {"role": "system", "content": system_msg},
            {"role": "user", "content": user_msg},
        ]
    )

    raw = content.strip()
    start = raw.find("[")
    end = raw.rfind("]")
    if start != -1 and end != -1 and end > start:
        snippet = raw[start : end + 1]
    else:
        snippet = raw

    selected: List[str] = []
    try:
        data = json.loads(snippet)
        if isinstance(data, list):
            for item in data:
                if isinstance(item, str):
                    selected.append(item)
                elif isinstance(item, dict) and isinstance(item.get("id"), str):
                    selected.append(item["id"])
    except Exception:
        selected = []

    known_ids = {item["option_id"] for item in catalog}
    uniq: List[str] = []
    for option_id in selected:
        if option_id in known_ids and option_id not in uniq:
            uniq.append(option_id)
    return uniq


def search_v2(query: str, return_debug: bool = False) -> Dict[str, Any]:
    catalog = list_region_theme_options()
    selected_ids = _select_theme_options(query, catalog)

    catalog_map = {item["option_id"]: item for item in catalog}
    results: List[Dict[str, Any]] = []
    debug_info: Dict[str, Any] = {}

    for option_id in selected_ids:
        item = catalog_map[option_id]
        if ":" not in option_id:
            continue
        region_id, theme_id = option_id.split(":", 1)
        payload = load_theme_payload(region_id, theme_id)
        prompt_text = _compose_prompt(payload)
        results.append(
            {
                "id": option_id,
                "display_name": item["display_name"],
                "region": payload["region"],
                "theme": payload["theme"],
                "business_scopes": payload["business_scopes"],
                "permits": payload["permits"],
                "prompt_snippet": prompt_text,
            }
        )

    if return_debug:
        debug_info = {
            "catalog_size": len(catalog),
            "selected_option_ids": selected_ids,
        }

    return {
        "risk_subject": results,
        "debug": debug_info if return_debug else {},
    }