"""Briefing API: RSS feeds, weather, and briefing configuration."""

import asyncio
import json
import logging

from quart import Blueprint, g, jsonify, request
from sqlalchemy import select

from fabledassistant.auth import login_required
from fabledassistant.models import async_session
from fabledassistant.models.conversation import Conversation, Message
from fabledassistant.models.rss_feed import RssFeed, RssItem
from fabledassistant.services import rss as rss_svc
from fabledassistant.services import weather as weather_svc
from fabledassistant.services.briefing_conversations import (
    get_or_create_today_conversation,
    list_briefing_conversations,
    post_message,
)
from fabledassistant.services.chat import add_message, get_conversation
from fabledassistant.services.generation_buffer import create_buffer, get_buffer
from fabledassistant.services.generation_task import run_generation
from fabledassistant.services.settings import get_setting, set_settings_batch

logger = logging.getLogger(__name__)
briefing_bp = Blueprint("briefing", __name__, url_prefix="/api/briefing")

_REQUIRE = login_required


# ── Config ────────────────────────────────────────────────────────────────────

@briefing_bp.route("/config", methods=["GET"])
@_REQUIRE
async def get_config():
    raw = await get_setting(g.user.id, "briefing_config", "{}")
    try:
        config = json.loads(raw) if isinstance(raw, str) else (raw or {})
    except Exception:
        config = {}
    return jsonify(config)


@briefing_bp.route("/config", methods=["PUT"])
@_REQUIRE
async def put_config():
    data = await request.get_json()
    await set_settings_batch(g.user.id, {"briefing_config": json.dumps(data)})
    # Live-patch the scheduler using the stored user_timezone.
    from fabledassistant.services.briefing_scheduler import update_user_schedule
    tz_override = await get_setting(g.user.id, "user_timezone") or None
    update_user_schedule(g.user.id, data, tz_override=tz_override)
    return jsonify({"ok": True})


# ── RSS Feeds ─────────────────────────────────────────────────────────────────

@briefing_bp.route("/feeds", methods=["GET"])
@_REQUIRE
async def list_feeds():
    async with async_session() as session:
        result = await session.execute(
            select(RssFeed).where(RssFeed.user_id == g.user.id).order_by(RssFeed.id)
        )
        feeds = list(result.scalars().all())
    return jsonify([f.to_dict() for f in feeds])


@briefing_bp.route("/feeds", methods=["POST"])
@_REQUIRE
async def add_feed():
    data = await request.get_json()
    url = (data.get("url") or "").strip()
    if not url:
        return jsonify({"error": "url required"}), 400
    scheme = url.split("://")[0].lower() if "://" in url else ""
    if scheme not in ("http", "https"):
        return jsonify({"error": "Feed URL must use http or https"}), 400
    from fabledassistant.services.llm import _is_private_url
    if _is_private_url(url):
        return jsonify({"error": "Feed URL must not point to an internal address"}), 400
    category = data.get("category") or None

    async with async_session() as session:
        # Prevent duplicates
        existing = await session.execute(
            select(RssFeed).where(RssFeed.user_id == g.user.id, RssFeed.url == url)
        )
        if existing.scalars().first():
            return jsonify({"error": "Feed already added"}), 409

        feed = RssFeed(user_id=g.user.id, url=url, title="", category=category)
        session.add(feed)
        await session.commit()
        await session.refresh(feed)
        feed_id = feed.id

    # Fetch in background to auto-populate title and get initial items
    asyncio.create_task(rss_svc.fetch_and_cache_feed(feed_id, url))

    return jsonify({"id": feed_id, "url": url, "title": "", "category": category}), 201


@briefing_bp.route("/feeds/<int:feed_id>", methods=["DELETE"])
@_REQUIRE
async def delete_feed(feed_id: int):
    async with async_session() as session:
        result = await session.execute(
            select(RssFeed).where(RssFeed.id == feed_id, RssFeed.user_id == g.user.id)
        )
        feed = result.scalars().first()
        if not feed:
            return jsonify({"error": "Not found"}), 404
        await session.delete(feed)
        await session.commit()
    return jsonify({"ok": True})


@briefing_bp.route("/feeds/refresh", methods=["POST"])
@_REQUIRE
async def refresh_feeds():
    results = await rss_svc.refresh_all_feeds(g.user.id)
    total_new = sum(results.values())
    return jsonify({"feeds_refreshed": len(results), "new_items": total_new})


@briefing_bp.route("/feeds/recent", methods=["GET"])
@_REQUIRE
async def recent_items():
    limit = min(int(request.args.get("limit", 20)), 100)
    items = await rss_svc.get_recent_items(g.user.id, limit=limit)
    return jsonify({"items": items})


# ── Weather ───────────────────────────────────────────────────────────────────

@briefing_bp.route("/weather", methods=["GET"])
@_REQUIRE
async def get_weather():
    rows = await weather_svc.get_cached_weather_rows(g.user.id)
    import json as _json
    raw = await get_setting(g.user.id, "briefing_config", "{}")
    try:
        _cfg = _json.loads(raw) if isinstance(raw, str) else (raw or {})
        temp_unit = _cfg.get("temp_unit", "C")
        if temp_unit not in ("C", "F"):
            temp_unit = "C"
    except Exception:
        temp_unit = "C"
    cards = [
        card for row in rows
        if (card := weather_svc.parse_weather_card_data(row, temp_unit)) is not None
    ]
    return jsonify({"locations": cards, "temp_unit": temp_unit})


@briefing_bp.route("/weather/current", methods=["GET"])
@_REQUIRE
async def get_current_weather():
    """Return current temperature, conditions, and precipitation for the user's primary location.

    Lightweight — fetches live from Open-Meteo, no caching. Intended for periodic frontend polling.
    """
    raw = await get_setting(g.user.id, "briefing_config", "{}")
    try:
        config = json.loads(raw) if isinstance(raw, str) else (raw or {})
        temp_unit = config.get("temp_unit", "C")
        if temp_unit not in ("C", "F"):
            temp_unit = "C"
        locations = config.get("locations", {})
    except Exception:
        return jsonify({"error": "No briefing config"}), 404

    # Use home location, fall back to work
    loc = locations.get("home") or locations.get("work")
    if not loc or not loc.get("lat") or not loc.get("lon"):
        return jsonify({"error": "No location configured"}), 404

    from fabledassistant.services.weather import fetch_current_conditions
    current = await fetch_current_conditions(loc["lat"], loc["lon"])
    if current is None:
        return jsonify({"error": "Failed to fetch current conditions"}), 502

    # Convert temperature if needed
    temp = current["temperature"]
    if temp is not None and temp_unit == "F":
        temp = temp * 9 / 5 + 32
    current["temperature"] = round(temp) if temp is not None else None
    current["temp_unit"] = temp_unit
    current["location"] = loc.get("label") or "Home"

    return jsonify(current)


@briefing_bp.route("/weather/geocode", methods=["POST"])
@_REQUIRE
async def geocode_location():
    data = await request.get_json()
    query = (data.get("query") or "").strip()
    if not query:
        return jsonify({"error": "query required"}), 400
    try:
        lat, lon, label = await weather_svc.geocode(query)
        return jsonify({"lat": lat, "lon": lon, "label": label})
    except ValueError as e:
        return jsonify({"error": str(e)}), 404


@briefing_bp.route("/weather/refresh", methods=["POST"])
@_REQUIRE
async def refresh_weather():
    raw = await get_setting(g.user.id, "briefing_config", "{}")
    try:
        config = json.loads(raw) if isinstance(raw, str) else {}
    except Exception:
        config = {}

    locations = config.get("locations", {})
    refreshed = []
    for key, loc in locations.items():
        if not loc.get("lat") or not loc.get("lon"):
            continue
        try:
            await weather_svc.refresh_location_cache(
                user_id=g.user.id,
                location_key=key,
                location_label=loc.get("label", key),
                lat=loc["lat"],
                lon=loc["lon"],
            )
            refreshed.append(key)
        except Exception:
            logger.warning("Failed to refresh weather for %s", key, exc_info=True)

    return jsonify({"refreshed": refreshed})


# ── Briefing Conversations ─────────────────────────────────────────────────────

@briefing_bp.route("/conversations", methods=["GET"])
@_REQUIRE
async def get_conversations():
    convs = await list_briefing_conversations(g.user.id)
    return jsonify({"conversations": convs})


@briefing_bp.route("/conversations/today", methods=["GET"])
@_REQUIRE
async def get_today_conversation():
    model = await get_setting(g.user.id, "default_model", "")
    conv = await get_or_create_today_conversation(g.user.id, model)
    # Load messages
    async with async_session() as session:
        result = await session.execute(
            select(Message)
            .where(Message.conversation_id == conv.id)
            .order_by(Message.created_at)
        )
        messages = [m.to_dict() for m in result.scalars().all()]
    data = conv.to_dict()
    data["messages"] = messages
    return jsonify(data)


@briefing_bp.route("/conversations/<int:conv_id>/messages", methods=["GET"])
@_REQUIRE
async def get_conversation_messages(conv_id: int):
    # Verify ownership
    async with async_session() as session:
        conv = await session.get(Conversation, conv_id)
        if not conv or conv.user_id != g.user.id or conv.conversation_type != "briefing":
            return jsonify({"error": "Not found"}), 404
        result = await session.execute(
            select(Message)
            .where(Message.conversation_id == conv_id)
            .order_by(Message.created_at)
        )
        messages = [m.to_dict() for m in result.scalars().all()]
    return jsonify({"messages": messages})


@briefing_bp.route("/trigger", methods=["POST"])
@_REQUIRE
async def manual_trigger():
    """Manually trigger a briefing compilation, including a fresh data refresh."""
    data = await request.get_json() or {}
    slot = data.get("slot", "compilation")
    if slot not in ("compilation", "morning", "midday", "afternoon"):
        return jsonify({"error": "invalid slot"}), 400

    # Refresh external data first (mirrors what the scheduler does)
    try:
        from fabledassistant.services.rss import refresh_all_feeds
        config_raw = await get_setting(g.user.id, "briefing_config", "{}")
        config = json.loads(config_raw) if isinstance(config_raw, str) else {}
        await refresh_all_feeds(g.user.id)
        for key, loc in config.get("locations", {}).items():
            if loc.get("lat") and loc.get("lon"):
                await weather_svc.refresh_location_cache(
                    user_id=g.user.id,
                    location_key=key,
                    location_label=loc.get("label", key),
                    lat=loc["lat"],
                    lon=loc["lon"],
                )
    except Exception:
        logger.warning("Pre-trigger refresh failed for user %d", g.user.id, exc_info=True)

    from fabledassistant.services.briefing_pipeline import run_compilation

    model = await get_setting(g.user.id, "default_model", "")
    conv = await get_or_create_today_conversation(g.user.id, model)
    text, metadata = await run_compilation(g.user.id, slot, model)
    msg = await post_message(conv.id, "assistant", text, metadata=metadata)
    return jsonify({"conversation_id": conv.id, "message_id": msg.id, "slot": slot})


# ── RSS Reactions ──────────────────────────────────────────────────────────────

@briefing_bp.route("/rss-reactions", methods=["POST"])
@_REQUIRE
async def upsert_rss_reaction():
    """Upsert a 👍/👎 reaction on an RSS item. Same reaction toggles off; opposite flips."""
    data = await request.get_json()
    rss_item_id = data.get("rss_item_id")
    reaction = data.get("reaction")

    if not rss_item_id or reaction not in ("up", "down"):
        return jsonify({"error": "rss_item_id and reaction ('up'|'down') required"}), 400

    from sqlalchemy import text as _text

    async with async_session() as session:
        # Ownership check: verify item belongs to a feed owned by this user
        result = await session.execute(
            _text("""
                SELECT i.id FROM rss_items i
                JOIN rss_feeds f ON f.id = i.feed_id
                WHERE i.id = :item_id AND f.user_id = :uid
            """).bindparams(item_id=rss_item_id, uid=g.user.id)
        )
        if result.first() is None:
            return jsonify({"error": "Not found"}), 404

        # Check existing reaction
        existing = await session.execute(
            _text("""
                SELECT id, reaction FROM rss_item_reactions
                WHERE user_id = :uid AND rss_item_id = :item_id
            """).bindparams(uid=g.user.id, item_id=rss_item_id)
        )
        row = existing.first()

        if row is None:
            await session.execute(
                _text("""
                    INSERT INTO rss_item_reactions (user_id, rss_item_id, reaction)
                    VALUES (:uid, :item_id, :reaction)
                """).bindparams(uid=g.user.id, item_id=rss_item_id, reaction=reaction)
            )
            action = "created"
        elif row.reaction == reaction:
            # Toggle off (same reaction clicked again)
            await session.execute(
                _text("""
                    DELETE FROM rss_item_reactions
                    WHERE user_id = :uid AND rss_item_id = :item_id
                """).bindparams(uid=g.user.id, item_id=rss_item_id)
            )
            action = "removed"
        else:
            # Flip to opposite reaction
            await session.execute(
                _text("""
                    UPDATE rss_item_reactions SET reaction = :reaction
                    WHERE user_id = :uid AND rss_item_id = :item_id
                """).bindparams(reaction=reaction, uid=g.user.id, item_id=rss_item_id)
            )
            action = "updated"

        await session.commit()

    return jsonify({"ok": True, "action": action})


@briefing_bp.route("/rss-reactions/<int:item_id>", methods=["DELETE"])
@_REQUIRE
async def delete_rss_reaction(item_id: int):
    """Explicitly remove a reaction (useful for MCP/external API callers)."""
    from sqlalchemy import text as _text

    async with async_session() as session:
        await session.execute(
            _text("""
                DELETE FROM rss_item_reactions
                WHERE user_id = :uid AND rss_item_id = :item_id
            """).bindparams(uid=g.user.id, item_id=item_id)
        )
        await session.commit()

    return jsonify({"ok": True})


@briefing_bp.route("/news", methods=["GET"])
@_REQUIRE
async def list_news():
    """Return recent RSS articles with optional feed filter and pagination.

    Query params:
      days    — lookback window (default 2, max 90)
      limit   — items per page (default 40, max 100)
      offset  — pagination offset (default 0)
      feed_id — optional integer filter by feed
    """
    from sqlalchemy import text as _text

    days = min(int(request.args.get("days", 2)), 90)
    limit = min(int(request.args.get("limit", 40)), 100)
    offset = max(int(request.args.get("offset", 0)), 0)
    feed_id = request.args.get("feed_id", type=int)

    async with async_session() as session:
        result = await session.execute(
            _text("""
                SELECT
                    i.id, i.title, i.url, i.content, i.published_at,
                    i.topics, f.title AS feed_title,
                    r.reaction
                FROM rss_items i
                JOIN rss_feeds f ON f.id = i.feed_id
                LEFT JOIN rss_item_reactions r
                    ON r.rss_item_id = i.id AND r.user_id = :uid
                WHERE f.user_id = :uid
                  AND (CAST(:feed_id AS integer) IS NULL OR f.id = CAST(:feed_id AS integer))
                  AND COALESCE(i.published_at, i.fetched_at) >= NOW() - make_interval(days => :days)
                ORDER BY COALESCE(i.published_at, i.fetched_at) DESC
                LIMIT :limit OFFSET :offset
            """).bindparams(uid=g.user.id, days=days, limit=limit,
                            offset=offset, feed_id=feed_id)
        )
        rows = result.mappings().all()

    items = [
        {
            "id": r["id"],
            "title": r["title"],
            "url": r["url"],
            "snippet": (r["content"] or "")[:300],
            "content": r["content"] or "",
            "published_at": r["published_at"].isoformat() if r["published_at"] else None,
            "topics": r["topics"] or [],
            "source": r["feed_title"],
            "reaction": r["reaction"],
        }
        for r in rows
    ]
    return jsonify({"items": items, "offset": offset, "limit": limit})


# ── Article Discuss ────────────────────────────────────────────────────────────

@briefing_bp.route("/articles/<int:item_id>/discuss", methods=["POST"])
@_REQUIRE
async def discuss_article(item_id: int):
    """Inject article content as a synthetic tool exchange and trigger generation."""
    data = await request.get_json() or {}
    conv_id = data.get("conv_id")
    if not conv_id:
        return jsonify({"error": "conv_id required"}), 400

    uid = g.user.id

    # Verify item belongs to user via feed ownership
    async with async_session() as session:
        result = await session.execute(
            select(RssItem)
            .join(RssFeed, RssFeed.id == RssItem.feed_id)
            .where(RssItem.id == item_id, RssFeed.user_id == uid)
        )
        item = result.scalars().first()
    if item is None:
        return jsonify({"error": "Not found"}), 404

    # Verify conversation belongs to user
    conv = await get_conversation(uid, conv_id)
    if conv is None:
        return jsonify({"error": "Conversation not found"}), 404

    # Reject if generation already running
    if get_buffer(conv_id) is not None:
        return jsonify({"error": "Generation already in progress"}), 409

    from fabledassistant.services.rss import _fetch_full_article
    article_content = await _fetch_full_article(item.url) or item.content or ""

    # Store synthetic assistant message with read_article tool result
    synthetic_tool_calls = [{
        "function": "read_article",
        "arguments": {"url": item.url},
        "result": {
            "success": True,
            "type": "article_content",
            "url": item.url,
            "content": article_content,
            "truncated": False,
        },
    }]
    await add_message(conv_id, "assistant", "", status="complete", tool_calls=synthetic_tool_calls)

    # Store user message
    await add_message(conv_id, "user", "Please summarize and discuss this article.")

    # Reload conversation with fresh messages to build history
    conv = await get_conversation(uid, conv_id)
    assert conv is not None

    history = []
    for msg in conv.messages:
        if msg.role == "system":
            continue
        msg_dict = {"role": msg.role, "content": msg.content or ""}
        if msg.tool_calls:
            msg_dict["tool_calls"] = [
                {"function": {"name": tc["function"], "arguments": tc["arguments"]}}
                for tc in msg.tool_calls
            ]
            history.append(msg_dict)
            for tc in msg.tool_calls:
                history.append({"role": "tool", "content": json.dumps(tc.get("result", {}))})
        else:
            history.append(msg_dict)

    model = await get_setting(uid, "default_model", "") or ""

    assistant_msg = await add_message(conv_id, "assistant", "", status="generating")
    buf = create_buffer(conv_id, assistant_msg.id)

    asyncio.create_task(run_generation(
        buf, history, model,
        uid, conv_id, conv.title or "",
        "Please summarize and discuss this article.",
        think=True,
    ))

    return jsonify({"assistant_message_id": assistant_msg.id, "status": "generating"}), 202


@briefing_bp.route("/topics/<topic>/discuss", methods=["POST"])
@_REQUIRE
async def discuss_topic(topic: str):
    """Discuss all recent articles in a topic cluster — multi-article deep analysis."""
    data = await request.get_json() or {}
    conv_id = data.get("conv_id")
    if not conv_id:
        return jsonify({"error": "conv_id required"}), 400

    uid = g.user.id

    # Verify conversation belongs to user
    conv = await get_conversation(uid, conv_id)
    if conv is None:
        return jsonify({"error": "Conversation not found"}), 404

    if get_buffer(conv_id) is not None:
        return jsonify({"error": "Generation already in progress"}), 409

    # Find recent articles with this topic (last 2 days)
    async with async_session() as session:
        result = await session.execute(
            select(RssItem)
            .join(RssFeed, RssFeed.id == RssItem.feed_id)
            .where(RssFeed.user_id == uid)
            .where(RssItem.topics.contains([topic]))
            .order_by(RssItem.published_at.desc().nullslast())
            .limit(5)
        )
        items = list(result.scalars().all())

    if not items:
        return jsonify({"error": f"No articles found for topic '{topic}'"}), 404

    # Fetch full content for each article
    from fabledassistant.services.rss import _fetch_full_article

    synthetic_tool_calls = []
    for item in items:
        content = await _fetch_full_article(item.url) if item.url else None
        content = content or item.content or ""
        synthetic_tool_calls.append({
            "function": "read_article",
            "arguments": {"url": item.url or ""},
            "result": {
                "success": True,
                "type": "article_content",
                "url": item.url or "",
                "title": item.title or "",
                "source": "",
                "content": content[:8000],  # cap per article to stay within context
                "truncated": len(content) > 8000,
            },
        })

    await add_message(conv_id, "assistant", "", status="complete", tool_calls=synthetic_tool_calls)

    user_prompt = (
        f"I'd like to discuss the {len(items)} articles about '{topic}'. "
        "Don't just summarize each one — draw connections between the sources, "
        "highlight where they agree or disagree, and share your analysis of what "
        "this means. Let's have a real discussion about this topic."
    )
    await add_message(conv_id, "user", user_prompt)

    conv = await get_conversation(uid, conv_id)
    assert conv is not None

    history = []
    for msg in conv.messages:
        if msg.role == "system":
            continue
        msg_dict = {"role": msg.role, "content": msg.content or ""}
        if msg.tool_calls:
            msg_dict["tool_calls"] = [
                {"function": {"name": tc["function"], "arguments": tc["arguments"]}}
                for tc in msg.tool_calls
            ]
            history.append(msg_dict)
            for tc in msg.tool_calls:
                history.append({"role": "tool", "content": json.dumps(tc.get("result", {}))})
        else:
            history.append(msg_dict)

    model = await get_setting(uid, "default_model", "") or ""

    assistant_msg = await add_message(conv_id, "assistant", "", status="generating")
    buf = create_buffer(conv_id, assistant_msg.id)

    asyncio.create_task(run_generation(
        buf, history, model,
        uid, conv_id, conv.title or "",
        user_prompt,
        think=True,
    ))

    return jsonify({
        "assistant_message_id": assistant_msg.id,
        "status": "generating",
        "article_count": len(items),
    }), 202