import logging
from datetime import datetime, timezone

from sqlalchemy.orm import Session

from app.character.service import CharacterService
from app.chat.notice_inbox import post_character_comment_to_latest_chat, post_notice_to_latest_chat
from app.db.models import Reminder
from app.llm.client import LLMClient
from app.reminders.service import RECURRENCE_NONE, _advance_due, _format_local

logger = logging.getLogger(__name__)


def format_reminder_notice(row: Reminder) -> str:
    local_when = _format_local(row.due_at, row.timezone, all_day=row.all_day)
    notice = f"📅 **Напоминание** · {row.title}\n\n_{local_when}_"
    if row.notes:
        notice += f"\n{row.notes}"
    return notice


class ReminderCompletionHandler:
    def __init__(self, db: Session, user_id: int):
        self.db = db
        self.user_id = user_id
        self.llm = LLMClient()
        self.character = CharacterService(db, user_id)

    async def _generate_llm_comment(self, row: Reminder, local_when: str) -> str:
        notes_part = f"\nЗаметки: {row.notes}" if row.notes else ""
        rec_part = ""
        if row.recurrence and row.recurrence != RECURRENCE_NONE:
            rec_part = f"\nПовтор: {row.recurrence}"

        system = self.character.get_system_prompt()
        user_prompt = f"""Сработало напоминание.
Заголовок: {row.title}
Время: {local_when}{notes_part}{rec_part}

Напиши пользователю короткое сообщение (2-4 предложения) на русском: напомни о деле, поддержи или предложи действие. Без markdown и без эмодзи."""

        result = await self.llm.complete(
            [
                {"role": "system", "content": system},
                {"role": "user", "content": user_prompt},
            ],
            temperature=0.8,
            visible_reply=True,
        )
        return (result.get("content") or "").strip() or f"Напоминание: {row.title}"

    def _mark_fired(self, row: Reminder, now: datetime) -> None:
        row.last_fired_at = now
        if row.recurrence == RECURRENCE_NONE:
            row.completed_at = now
            row.enabled = False
        else:
            row.due_at = _advance_due(row.due_at, row.recurrence)
            row.last_fired_at = None
        row.updated_at = now

    async def process(self, row: Reminder) -> None:
        local_when = _format_local(row.due_at, row.timezone, all_day=row.all_day)
        post_notice_to_latest_chat(format_reminder_notice(row), self.user_id)

        try:
            comment = await self._generate_llm_comment(row, local_when)
            if comment:
                post_character_comment_to_latest_chat(comment, self.user_id)
        except Exception:
            logger.exception("Reminder LLM comment failed (id=%s)", row.id)

        self._mark_fired(row, datetime.now(timezone.utc))