"""Event-related Immich bot commands: events, latest, memory, random."""

from __future__ import annotations

import asyncio
import logging
import random as rng
from datetime import datetime, timezone
from typing import Any

from sqlmodel import select
from sqlmodel.ext.asyncio.session import AsyncSession

from ...database.engine import get_engine
from ...database.models import (
    EventLog, NotificationTarget, NotificationTrackerTarget,
    ServiceProvider, TelegramBot, TrackingConfig,
)
from ..handler import _get_notification_trackers_for_providers, _render_cmd_template
from .common import _format_assets

_LOGGER = logging.getLogger(__name__)


async def _cmd_events(
    bot: TelegramBot, providers_map: dict[int, ServiceProvider],
    count: int, locale: str,
) -> dict[str, Any]:
    provider_ids = set(providers_map.keys())
    trackers = await _get_notification_trackers_for_providers(provider_ids)
    tracker_ids = [t.id for t in trackers]
    if not tracker_ids:
        return {"events": []}

    engine = get_engine()
    async with AsyncSession(engine) as session:
        result = await session.exec(
            select(EventLog)
            .where(EventLog.tracker_id.in_(tracker_ids))
            .order_by(EventLog.created_at.desc())
            .limit(count)
        )
        events = result.all()

    events_data = [
        {"type": e.event_type, "album": e.collection_name,
         "count": e.assets_count, "date": e.created_at.strftime("%m/%d %H:%M")}
        for e in events
    ]
    return {"events": events_data}


async def cmd_latest(
    client: Any, all_album_ids: list[str], count: int,
    locale: str, response_mode: str,
    cmd_templates: dict[str, dict[str, str]],
) -> str | list[dict[str, Any]]:
    """Handle /latest command with concurrent album fetching."""
    album_ids = all_album_ids[:10]
    if not album_ids:
        return _format_assets([], "latest", "", locale, response_mode, client, cmd_templates)

    results = await asyncio.gather(
        *[client.get_album(aid) for aid in album_ids],
        return_exceptions=True,
    )

    latest_assets: list[dict[str, Any]] = []
    for album_id, result in zip(album_ids, results):
        if isinstance(result, Exception):
            _LOGGER.warning("Failed to fetch album %s: %s", album_id, result)
            continue
        if result:
            for aid, asset in list(result.assets.items())[:count]:
                latest_assets.append({
                    "id": asset.id, "originalFileName": asset.filename,
                    "type": asset.type, "createdAt": asset.created_at,
                })

    latest_assets.sort(key=lambda a: a.get("createdAt", ""), reverse=True)
    return _format_assets(latest_assets[:count], "latest", "", locale, response_mode, client, cmd_templates)


async def cmd_random(
    client: Any, all_album_ids: list[str], count: int,
    locale: str, response_mode: str,
    cmd_templates: dict[str, dict[str, str]],
) -> str | list[dict[str, Any]]:
    """Handle /random command with concurrent album fetching."""
    album_ids = all_album_ids[:10]
    if not album_ids:
        return _format_assets([], "random", "", locale, response_mode, client, cmd_templates)

    results = await asyncio.gather(
        *[client.get_album(aid) for aid in album_ids],
        return_exceptions=True,
    )

    random_assets: list[dict[str, Any]] = []
    for album_id, result in zip(album_ids, results):
        if isinstance(result, Exception):
            _LOGGER.warning("Failed to fetch album %s: %s", album_id, result)
            continue
        if result:
            asset_list = list(result.assets.values())
            sampled = rng.sample(asset_list, min(count, len(asset_list)))
            for asset in sampled:
                random_assets.append({
                    "id": asset.id, "originalFileName": asset.filename,
                    "type": asset.type,
                })

    rng.shuffle(random_assets)
    return _format_assets(random_assets[:count], "random", "", locale, response_mode, client, cmd_templates)


async def _check_native_memory(bot: TelegramBot) -> bool:
    """Check if any tracker-target linked to this bot uses native memory source."""
    engine = get_engine()
    async with AsyncSession(engine) as session:
        result = await session.exec(
            select(NotificationTarget).where(
                NotificationTarget.type == "telegram",
                NotificationTarget.user_id == bot.user_id,
            )
        )
        targets = result.all()
        bot_target_ids = {t.id for t in targets if t.config.get("bot_token") == bot.token}
        if not bot_target_ids:
            return False
        tt_result = await session.exec(
            select(NotificationTrackerTarget).where(
                NotificationTrackerTarget.target_id.in_(bot_target_ids)
            )
        )
        for tt in tt_result.all():
            if tt.tracking_config_id:
                tc = await session.get(TrackingConfig, tt.tracking_config_id)
                if tc and tc.memory_source == "native":
                    return True
    return False


async def cmd_memory(
    bot: TelegramBot, client: Any, all_album_ids: list[str], count: int,
    locale: str, response_mode: str,
    cmd_templates: dict[str, dict[str, str]],
) -> str | list[dict[str, Any]]:
    """Handle /memory command with concurrent album fetching."""
    use_native = await _check_native_memory(bot)
    today = datetime.now(timezone.utc)
    memory_assets: list[dict[str, Any]] = []

    if use_native:
        memories = await client.get_memories()
        tracked_ids = set(all_album_ids) if all_album_ids else None
        for mem in memories:
            year = mem.get("data", {}).get("year")
            for raw_asset in mem.get("assets", []):
                if tracked_ids:
                    asset_albums = raw_asset.get("albums", [])
                    if not any(a.get("id") in tracked_ids for a in asset_albums):
                        continue
                memory_assets.append({
                    "id": raw_asset.get("id", ""),
                    "originalFileName": raw_asset.get("originalFileName", ""),
                    "type": raw_asset.get("type", "IMAGE"),
                    "createdAt": raw_asset.get("fileCreatedAt", raw_asset.get("createdAt", "")),
                    "year": year,
                })
    else:
        album_ids = all_album_ids[:10]
        if album_ids:
            results = await asyncio.gather(
                *[client.get_album(aid) for aid in album_ids],
                return_exceptions=True,
            )
            month_day = (today.month, today.day)
            for album_id, result in zip(album_ids, results):
                if isinstance(result, Exception):
                    _LOGGER.warning("Failed to fetch album %s: %s", album_id, result)
                    continue
                if result:
                    for aid, asset in result.assets.items():
                        try:
                            dt = datetime.fromisoformat(asset.created_at.replace("Z", "+00:00"))
                            if (dt.month, dt.day) == month_day and dt.year != today.year:
                                memory_assets.append({
                                    "id": asset.id, "originalFileName": asset.filename,
                                    "type": asset.type, "createdAt": asset.created_at,
                                    "year": dt.year,
                                })
                        except (ValueError, AttributeError):
                            pass

    memory_assets = memory_assets[:count]
    if not memory_assets:
        return _render_cmd_template(cmd_templates, "no_results", locale, {"command": "memory", "query": ""})
    return _format_assets(memory_assets, "memory", "", locale, response_mode, client, cmd_templates)