import asyncio
import os
import shutil
from typing import Any, Dict

from sqlmodel import Session, select

from core.docker_instance import docker_manager
from core.settings import BOTS_WORKSPACE_ROOT
from models.bot import BotInstance, BotMessage
from models.platform import BotActivityEvent, BotRequestUsage
from models.skill import BotSkillInstall
from models.topic import TopicItem, TopicTopic
from services.bot_service import (
    _safe_float,
    _safe_int,
    read_bot_runtime_snapshot,
    resolve_bot_runtime_env_params,
    sync_bot_workspace_channels,
)
from services.bot_storage_service import write_bot_env_params
from services.cache_service import _invalidate_bot_detail_cache, _invalidate_bot_messages_cache
from services.platform_service import record_activity_event
from services.runtime_service import docker_callback, record_agent_loop_ready_warning


def _get_bot_or_404(session: Session, bot_id: str) -> BotInstance:
    bot = session.get(BotInstance, bot_id)
    if not bot:
        raise ValueError("Bot not found")
    return bot


async def start_bot_instance(session: Session, bot_id: str) -> Dict[str, Any]:
    bot = _get_bot_or_404(session, bot_id)
    if not bool(getattr(bot, "enabled", True)):
        raise PermissionError("Bot is disabled. Enable it first.")

    sync_bot_workspace_channels(session, bot_id)
    runtime_snapshot = read_bot_runtime_snapshot(bot)
    env_params = resolve_bot_runtime_env_params(bot_id)
    write_bot_env_params(bot_id, env_params)
    success = docker_manager.start_bot(
        bot_id,
        image_tag=bot.image_tag,
        on_state_change=docker_callback,
        env_vars=env_params,
        cpu_cores=_safe_float(runtime_snapshot.get("cpu_cores"), 1.0),
        memory_mb=_safe_int(runtime_snapshot.get("memory_mb"), 1024),
        storage_gb=_safe_int(runtime_snapshot.get("storage_gb"), 10),
    )
    if not success:
        bot.docker_status = "STOPPED"
        session.add(bot)
        session.commit()
        raise RuntimeError(f"Failed to start container with image {bot.image_tag}")

    actual_status = docker_manager.get_bot_status(bot_id)
    bot.docker_status = actual_status
    if actual_status != "RUNNING":
        session.add(bot)
        session.commit()
        _invalidate_bot_detail_cache(bot_id)
        raise RuntimeError("Bot container failed shortly after startup. Check bot logs/config.")

    asyncio.create_task(record_agent_loop_ready_warning(bot_id))
    session.add(bot)
    record_activity_event(session, bot_id, "bot_started", channel="system", detail=f"Container started for {bot_id}")
    session.commit()
    _invalidate_bot_detail_cache(bot_id)
    return {"status": "started"}


def stop_bot_instance(session: Session, bot_id: str) -> Dict[str, Any]:
    bot = _get_bot_or_404(session, bot_id)
    if not bool(getattr(bot, "enabled", True)):
        raise PermissionError("Bot is disabled. Enable it first.")

    docker_manager.stop_bot(bot_id)
    bot.docker_status = "STOPPED"
    session.add(bot)
    record_activity_event(session, bot_id, "bot_stopped", channel="system", detail=f"Container stopped for {bot_id}")
    session.commit()
    _invalidate_bot_detail_cache(bot_id)
    return {"status": "stopped"}


def enable_bot_instance(session: Session, bot_id: str) -> Dict[str, Any]:
    bot = _get_bot_or_404(session, bot_id)
    bot.enabled = True
    session.add(bot)
    record_activity_event(session, bot_id, "bot_enabled", channel="system", detail=f"Bot {bot_id} enabled")
    session.commit()
    _invalidate_bot_detail_cache(bot_id)
    return {"status": "enabled", "enabled": True}


def disable_bot_instance(session: Session, bot_id: str) -> Dict[str, Any]:
    bot = _get_bot_or_404(session, bot_id)
    docker_manager.stop_bot(bot_id)
    bot.enabled = False
    bot.docker_status = "STOPPED"
    if str(bot.current_state or "").upper() not in {"ERROR"}:
        bot.current_state = "IDLE"
    session.add(bot)
    record_activity_event(session, bot_id, "bot_disabled", channel="system", detail=f"Bot {bot_id} disabled")
    session.commit()
    _invalidate_bot_detail_cache(bot_id)
    return {"status": "disabled", "enabled": False}


def deactivate_bot_instance(session: Session, bot_id: str) -> Dict[str, Any]:
    bot = _get_bot_or_404(session, bot_id)
    docker_manager.stop_bot(bot_id)
    bot.enabled = False
    bot.docker_status = "STOPPED"
    if str(bot.current_state or "").upper() not in {"ERROR"}:
        bot.current_state = "IDLE"
    session.add(bot)
    record_activity_event(session, bot_id, "bot_deactivated", channel="system", detail=f"Bot {bot_id} deactivated")
    session.commit()
    _invalidate_bot_detail_cache(bot_id)
    return {"status": "deactivated"}


def delete_bot_instance(session: Session, bot_id: str, delete_workspace: bool = True) -> Dict[str, Any]:
    bot = _get_bot_or_404(session, bot_id)
    docker_manager.stop_bot(bot_id)

    messages = session.exec(select(BotMessage).where(BotMessage.bot_id == bot_id)).all()
    for row in messages:
        session.delete(row)
    topic_items = session.exec(select(TopicItem).where(TopicItem.bot_id == bot_id)).all()
    for row in topic_items:
        session.delete(row)
    topics = session.exec(select(TopicTopic).where(TopicTopic.bot_id == bot_id)).all()
    for row in topics:
        session.delete(row)
    usage_rows = session.exec(select(BotRequestUsage).where(BotRequestUsage.bot_id == bot_id)).all()
    for row in usage_rows:
        session.delete(row)
    activity_rows = session.exec(select(BotActivityEvent).where(BotActivityEvent.bot_id == bot_id)).all()
    for row in activity_rows:
        session.delete(row)
    skill_install_rows = session.exec(select(BotSkillInstall).where(BotSkillInstall.bot_id == bot_id)).all()
    for row in skill_install_rows:
        session.delete(row)

    session.delete(bot)
    session.commit()

    if delete_workspace:
        workspace_root = os.path.join(BOTS_WORKSPACE_ROOT, bot_id)
        if os.path.isdir(workspace_root):
            shutil.rmtree(workspace_root, ignore_errors=True)

    _invalidate_bot_detail_cache(bot_id)
    _invalidate_bot_messages_cache(bot_id)
    return {"status": "deleted", "workspace_deleted": bool(delete_workspace)}