"""Автоответы ИИ по тикетам через OpenRouter."""

from __future__ import annotations

import html
import logging
import re
from typing import Any

from aiogram import Bot

from config import Settings
from services.db import Database
from services.faq import FAQ_ITEMS
from services.openrouter import (
    AiDecision,
    chat_completion,
    load_openrouter_config,
    parse_ai_decision,
)
from services.tickets import (
    BODY_MAX,
    clamp_body,
    notify_user_ticket_reply,
)

logger = logging.getLogger(__name__)

_HTML_RE = re.compile(r"<[^>]+>")


def _strip_html(text: str) -> str:
    t = _HTML_RE.sub("", text or "")
    return (
        t.replace("&nbsp;", " ")
        .replace("&lt;", "<")
        .replace("&gt;", ">")
        .replace("&amp;", "&")
        .replace("&quot;", '"')
        .strip()
    )


def build_faq_context() -> str:
    lines = ["FAQ сервиса:"]
    for item in FAQ_ITEMS:
        lines.append(f"Q: {_strip_html(item.question)}")
        lines.append(f"A: {_strip_html(item.answer)}")
        lines.append("")
    return "\n".join(lines).strip()


def build_ticket_messages_for_ai(messages: list[dict[str, Any]]) -> list[dict[str, str]]:
    out: list[dict[str, str]] = []
    for msg in messages[-20:]:
        role = str(msg.get("author_role") or "")
        body = str(msg.get("body") or "").strip()
        if not body:
            continue
        if role == "user":
            out.append({"role": "user", "content": body})
        else:
            prefix = "ИИ" if role == "ai" else "Поддержка"
            out.append({"role": "assistant", "content": f"[{prefix}] {body}"})
    return out


async def notify_admins_ai_escalate(
    bot: Bot,
    settings: Settings,
    *,
    ticket_id: int,
    telegram_id: int,
    subject: str,
    reason: str,
) -> None:
    from keyboards import admin_ticket_notify_inline

    text = (
        f"<b>👤 Нужен человек · тикет #{ticket_id}</b>\n"
        f"От: <code>{telegram_id}</code>\n"
        f"Тема: <b>{html.escape(subject)}</b>\n\n"
        f"ИИ эскалировал: {html.escape((reason or 'без причины')[:400])}"
    )
    kb = admin_ticket_notify_inline(ticket_id)
    for admin_id in settings.admin_ids:
        try:
            await bot.send_message(admin_id, text, reply_markup=kb, parse_mode="HTML")
        except Exception as exc:  # noqa: BLE001
            logger.warning("notify admin escalate %s: %s", admin_id, exc)


async def try_ai_ticket_reply(
    *,
    db: Database,
    bot: Bot | None,
    settings: Settings,
    ticket_id: int,
    notify_user: bool = True,
) -> dict[str, Any]:
    """
    Пытается ответить на тикет через OpenRouter.
    Возвращает dict: ok, action, detail, model?
    """
    cfg = load_openrouter_config(db)
    if not cfg.ready or not cfg.auto_reply:
        return {"ok": False, "action": "skip", "detail": "ai disabled"}

    ticket = db.get_ticket(ticket_id)
    if not ticket:
        return {"ok": False, "action": "skip", "detail": "ticket not found"}
    if str(ticket.get("status")) == "closed":
        return {"ok": False, "action": "skip", "detail": "closed"}

    messages = db.list_ticket_messages(ticket_id)
    if not messages:
        return {"ok": False, "action": "skip", "detail": "no messages"}
    last = messages[-1]
    if str(last.get("author_role")) != "user":
        return {"ok": False, "action": "skip", "detail": "last not user"}

    subject = str(ticket.get("subject") or "")
    system = cfg.system_prompt.strip()
    faq = build_faq_context()
    system_full = (
        f"{system}\n\n{faq}\n\n"
        f"Текущий тикет #{ticket_id}, тема: {subject}"
    )
    chat_messages = [
        {"role": "system", "content": system_full},
        *build_ticket_messages_for_ai(messages),
    ]

    referer = (settings.webapp_url or "").rstrip("/") or "https://bot.example.com"
    try:
        raw, used_model = await chat_completion(
            api_key=cfg.api_key,
            model=cfg.model,
            models=cfg.models_for_request(),
            messages=chat_messages,
            referer=referer,
        )
        decision = parse_ai_decision(raw, used_model=used_model)
    except Exception as exc:  # noqa: BLE001
        logger.exception("OpenRouter ticket #%s failed", ticket_id)
        if bot is not None:
            await notify_admins_ai_escalate(
                bot,
                settings,
                ticket_id=ticket_id,
                telegram_id=int(ticket["telegram_id"]),
                subject=subject,
                reason=f"Ошибка ИИ: {exc}",
            )
        return {"ok": False, "action": "error", "detail": str(exc)}

    return await _apply_decision(
        db=db,
        bot=bot,
        settings=settings,
        ticket=ticket,
        decision=decision,
        notify_user=notify_user,
    )


async def _apply_decision(
    *,
    db: Database,
    bot: Bot | None,
    settings: Settings,
    ticket: dict[str, Any],
    decision: AiDecision,
    notify_user: bool,
) -> dict[str, Any]:
    ticket_id = int(ticket["id"])
    subject = str(ticket.get("subject") or "")
    telegram_id = int(ticket["telegram_id"])

    if decision.action == "answer" and decision.reply.strip():
        reply = clamp_body(decision.reply)
        if len(reply) > BODY_MAX:
            reply = reply[: BODY_MAX - 1] + "…"
        try:
            db.add_ticket_message(
                ticket_id,
                author_role="ai",
                author_id=None,
                body=reply,
            )
        except ValueError as exc:
            return {"ok": False, "action": "error", "detail": str(exc)}

        if notify_user and bot is not None:
            await notify_user_ticket_reply(
                bot,
                telegram_id=telegram_id,
                ticket_id=ticket_id,
                subject=subject,
                body=reply,
                is_ai=True,
            )
        logger.info(
            "AI answered ticket #%s model=%s",
            ticket_id,
            decision.model or "?",
        )
        return {
            "ok": True,
            "action": "answer",
            "detail": "ok",
            "model": decision.model,
            "reply": reply,
        }

    reason = decision.reason or "Нужен оператор"
    if bot is not None:
        await notify_admins_ai_escalate(
            bot,
            settings,
            ticket_id=ticket_id,
            telegram_id=telegram_id,
            subject=subject,
            reason=reason,
        )
    return {
        "ok": True,
        "action": "escalate",
        "detail": reason,
        "model": decision.model,
    }