from __future__ import annotations

import os
from flask import Flask, jsonify, request

from env_loader import load_env
from smart_cors_middleware import init_smart_cors
import time
from concurrent.futures import ThreadPoolExecutor
from lawrisk_service import (
    ensure_database,
    ensure_schema,
    search_subjects,
    search_subjects_llm,
    shortlist_subjects,
    suggest_questions_from_subjects,
    suggest_questions_embed,
)


def create_app() -> Flask:
    # Load .env before creating app to make CORS/env configs available
    load_env()
    # Ensure DB and schema exist before serving
    try:
        ensure_database()
        ensure_schema()
    except Exception:
        # Do not block app start; errors will surface on first request
        pass
    app = Flask(__name__)
    # Enable CORS using existing middleware
    init_smart_cors(app)

    @app.route("/fs-ai-asistant/api/workflow/lawrisk", methods=["POST", "GET"])
    def lawrisk_search():
        if request.method == "GET":
            query = request.args.get("query") or request.args.get("q") or request.args.get("text")
            debug_flag = request.args.get("debug") in {"1", "true", "yes", "on"}
            top_k = request.args.get("top")
            try:
                top_k_int = int(top_k) if top_k else 5
            except Exception:
                top_k_int = 5
            mode = (request.args.get("mode") or "llm").lower()
        else:
            # Prefer x-www-form-urlencoded; fallback to JSON if provided
            if request.is_json:
                payload = request.get_json(silent=True) or {}
            else:
                payload = request.form.to_dict(flat=True) if request.form else {}

            query = payload.get("query") or payload.get("q") or payload.get("text")
            debug_flag = str(payload.get("debug", "")).strip().lower() in {"1", "true", "yes", "on"}
            try:
                top_k_int = int(payload.get("top", 5))
            except Exception:
                top_k_int = 5
            mode = str(payload.get("mode", "llm")).lower()

        if not query or not isinstance(query, str):
            return jsonify({"error": "query is required"}), 400
        try:
            t0 = time.time()
            with ThreadPoolExecutor(max_workers=3) as ex:
                fut_ret = ex.submit(
                    search_subjects if mode == "embed" else search_subjects_llm,
                    query,
                    debug_flag,
                    top_k_int,
                )
                # Use embedding-based question suggestion (falls back internally if not available)
                fut_qs = ex.submit(suggest_questions_embed, query, max(1, top_k_int))

                result = fut_ret.result()
                rec_questions = fut_qs.result() or []

            # If debug requested, still log to backend for visibility
            if debug_flag and isinstance(result, dict) and "debug" in result:
                dbg = result["debug"]
                model = dbg.get("model") or "embed"
                app.logger.info("[LAWRISK-DEBUG] mode=%s", model)

            # Extract risk_subject and optional debug
            risk_subject = []
            dbg = {}
            if isinstance(result, dict):
                risk_subject = result.get("risk_subject", [])
                if debug_flag:
                    dbg = result.get("debug", {})

            found = bool(risk_subject)
            llm_resp = "" if found else "抱歉，无法检索到相关答案"
            exec_time = int((time.time() - t0) * 1000)

            # rec_questions 已由 embedding 建议生成（内部包含兜底）

            data = {
                "llmRespond": llm_resp,
                "lawRisk": "",
                "questionExtend": rec_questions,
                "conversationId": "",
                "messageId": "",
                "roundNumber": 0,
                "conversationInfo": {},
                "knowledgeSources": [],
                "totalKnowledgeSources": 0,
                "executionTime": exec_time,
                "workflowStatus": "ok" if found else "no_match",
                "executionSteps": [],
                "costStatistics": {},
                "workflowTrackingId": "",
                # extra fields requested
                "risk_subject": risk_subject,
                "debug": dbg if debug_flag else {},
            }
            resp = {"success": True, "message": "OK", "data": data}
            return jsonify(resp)
        except Exception as e:
            app.logger.exception("lawrisk_search error")
            return jsonify({"success": False, "message": str(e), "data": {}}), 500

    # Basic health check
    @app.get("/healthz")
    def healthz():
        return jsonify({"status": "ok"})

    return app


if __name__ == "__main__":
    port = int(os.getenv("PORT", "8000"))
    app = create_app()
    app.run(host="0.0.0.0", port=port)