"""
Flare – Chat Handler
~~~~~~~~~~~~~~~~~~~~
Intent → Parametre → API → Humanize akışı.
"""

import json
import re
from datetime import datetime
from typing import Dict, List, Optional

from fastapi import APIRouter, HTTPException

from config_provider import (ConfigProvider, IntentConfig,
                             ParameterConfig, VersionConfig)
from llm_connector import ask_llm
from prompt_builder import (build_intent_prompt, build_param_prompt,
                            build_api_humanize_prompt)
from api_executor import call_api
from session import SessionStore
from utils import log

router = APIRouter()
cfg = ConfigProvider.get()

# ==================== Helpers ===============================================
def _detect_intent(version: VersionConfig, user_input: str) -> Optional[IntentConfig]:
    for intent in version.intents:
        prompt = build_intent_prompt(version.general_prompt, intent)
        llm_resp = ask_llm(prompt, user_input, mode="classification")
        if intent.name in llm_resp.lower():
            return intent
    return None


def _extract_params(intent: IntentConfig, version: VersionConfig,
                    user_input: str,
                    current_vars: Dict[str, str]) -> Dict[str, str]:
    missing = [p for p in intent.parameters
               if p.name not in current_vars]
    if not missing:
        return current_vars

    prompt_base = build_intent_prompt(version.general_prompt, intent)
    prompt = build_param_prompt(prompt_base, missing)
    llm_json = ask_llm(prompt, user_input, mode="json")
    current_vars.update(llm_json)
    return current_vars


# ==================== Endpoint ==============================================
@router.post("/chat")
def chat(session_id: str, user_input: str):
    session = SessionStore.get(session_id)
    project = cfg.projects[0]  # simplistic: first project
    version = next(v for v in project.versions if v.published)

    # 1) Intent Detection
    intent = _detect_intent(version, user_input)
    if not intent:
        reply = ask_llm(version.general_prompt, user_input)
        session.add_turn("assistant", reply)
        return {"reply": reply}

    # 2) Param Extraction
    vars_ = session.variables
    vars_ = _extract_params(intent, version, user_input, vars_)

    # 3) Eksik parametre kontrolü
    missing = [p for p in intent.parameters if p.required and p.name not in vars_]
    if missing:
        ask_prompts = "\n".join(p.invalid_prompt or f"{p.name} gerekti" for p in missing)
        reply = ask_llm(version.general_prompt, ask_prompts)
        return {"reply": reply}

    # 4) API
    api_cfg = cfg.apis[intent.action]
    try:
        resp = call_api(api_cfg, vars_)
    except Exception as e:
        log(f"❌ API error: {e}")
        reply = intent.fallback_error_prompt or "İşlem sırasında hata oluştu."
        return {"reply": reply}

    # 5) Humanize
    human_prompt = build_api_humanize_prompt(
        version.general_prompt,
        api_cfg.response_prompt,
        json.dumps(resp.json(), ensure_ascii=False, indent=2)
    )
    reply = ask_llm(human_prompt, "")
    session.add_turn("assistant", reply)
    return {"reply": reply, "session": session.to_dict()}