"""Social fediverse routes: timeline, compose, search, follow, interactions, notifications."""
from __future__ import annotations

import logging
from datetime import datetime

from quart import Blueprint, request, g, redirect, url_for, abort, Response

from shared.services.registry import services
from shared.sx.helpers import sx_response, sx_call

log = logging.getLogger(__name__)


def _require_actor():
    """Return actor context or abort 403."""
    actor = g.get("ctx", {}).get("actor") if hasattr(g, "ctx") else None
    if not actor:
        actor = getattr(g, "_social_actor", None)
    if not actor:
        abort(403, "You need to choose a federation username first")
    return actor


def register(url_prefix="/social"):
    bp = Blueprint("social", __name__, url_prefix=url_prefix)

    @bp.before_request
    async def load_actor():
        """Load actor profile for authenticated users."""
        if g.get("user"):
            actor = await services.federation.get_actor_by_user_id(g.s, g.user.id)
            g._social_actor = actor

    # -- Timeline pagination ---------------------------------------------------

    @bp.get("/timeline")
    async def home_timeline_page():
        actor = _require_actor()
        before_str = request.args.get("before")
        before = None
        if before_str:
            try:
                before = datetime.fromisoformat(before_str)
            except ValueError:
                pass
        items = await services.federation.get_home_timeline(
            g.s, actor.id, before=before,
        )
        sx_src = _render_timeline_items(items, "home", actor)
        return sx_response(sx_src)

    @bp.get("/public/timeline")
    async def public_timeline_page():
        before_str = request.args.get("before")
        before = None
        if before_str:
            try:
                before = datetime.fromisoformat(before_str)
            except ValueError:
                pass
        items = await services.federation.get_public_timeline(g.s, before=before)
        actor = getattr(g, "_social_actor", None)
        sx_src = _render_timeline_items(items, "public", actor)
        return sx_response(sx_src)

    # -- Compose ---------------------------------------------------------------

    @bp.post("/compose")
    async def compose_submit():
        actor = _require_actor()
        form = await request.form
        content = form.get("content", "").strip()
        if not content:
            return redirect(url_for("defpage_compose_form"))

        visibility = form.get("visibility", "public")
        in_reply_to = form.get("in_reply_to") or None

        await services.federation.create_local_post(
            g.s, actor.id,
            content=content,
            visibility=visibility,
            in_reply_to=in_reply_to,
        )
        return redirect(url_for("defpage_home_timeline"))

    @bp.post("/delete/<int:post_id>")
    async def delete_post(post_id: int):
        actor = _require_actor()
        await services.federation.delete_local_post(g.s, actor.id, post_id)
        return redirect(url_for("defpage_home_timeline"))

    # -- Search + Follow -------------------------------------------------------

    @bp.get("/search/page")
    async def search_page():
        from sxc.pages.utils import _serialize_remote_actor, _serialize_actor

        actor = getattr(g, "_social_actor", None)
        query = request.args.get("q", "").strip()
        page = request.args.get("page", 1, type=int)
        actors_list = []
        total = 0
        followed_urls: set[str] = set()
        if query:
            actors_list, total = await services.federation.search_actors(
                g.s, query, page=page,
            )
            if actor:
                following, _ = await services.federation.get_following(
                    g.s, actor.preferred_username, page=1, per_page=1000,
                )
                followed_urls = {a.actor_url for a in following}

        actor_dicts = [_serialize_remote_actor(a) for a in actors_list]
        actor_data = _serialize_actor(actor)
        parts = []
        for ad in actor_dicts:
            parts.append(sx_call("federation-actor-card-from-data",
                a=ad, actor=actor_data,
                followed_urls=list(followed_urls), list_type="search"))
        if len(actors_list) >= 20:
            next_url = url_for("social.search_page", q=query, page=page + 1)
            parts.append(sx_call("federation-scroll-sentinel", url=next_url))
        sx_src = "(<> " + " ".join(parts) + ")" if parts else ""
        return sx_response(sx_src)

    @bp.post("/follow")
    async def follow():
        actor = _require_actor()
        form = await request.form
        remote_actor_url = form.get("actor_url", "")
        if remote_actor_url:
            await services.federation.send_follow(
                g.s, actor.preferred_username, remote_actor_url,
            )
        if request.headers.get("SX-Request") or request.headers.get("HX-Request"):
            return await _actor_card_response(actor, remote_actor_url, is_followed=True)
        return redirect(request.referrer or url_for("defpage_search"))

    @bp.post("/unfollow")
    async def unfollow():
        actor = _require_actor()
        form = await request.form
        remote_actor_url = form.get("actor_url", "")
        if remote_actor_url:
            await services.federation.unfollow(
                g.s, actor.preferred_username, remote_actor_url,
            )
        if request.headers.get("SX-Request") or request.headers.get("HX-Request"):
            return await _actor_card_response(actor, remote_actor_url, is_followed=False)
        return redirect(request.referrer or url_for("defpage_search"))

    async def _actor_card_response(actor, remote_actor_url, is_followed):
        """Re-render a single actor card after follow/unfollow via HTMX."""
        from sxc.pages.utils import _serialize_remote_actor, _serialize_actor

        remote_dto = await services.federation.get_or_fetch_remote_actor(
            g.s, remote_actor_url,
        )
        if not remote_dto:
            return Response("", status=200)
        followed_urls = {remote_actor_url} if is_followed else set()
        referer = request.referrer or ""
        list_type = "followers" if "/followers" in referer else "following"
        actor_data = _serialize_actor(actor)
        ad = _serialize_remote_actor(remote_dto)
        return sx_response(sx_call("federation-actor-card-from-data",
            a=ad, actor=actor_data,
            followed_urls=list(followed_urls), list_type=list_type))

    # -- Interactions ----------------------------------------------------------

    @bp.post("/like")
    async def like():
        actor = _require_actor()
        form = await request.form
        object_id = form.get("object_id", "")
        author_inbox = form.get("author_inbox", "")
        await services.federation.like_post(g.s, actor.id, object_id, author_inbox)
        return await _interaction_buttons_response(actor, object_id, author_inbox)

    @bp.post("/unlike")
    async def unlike():
        actor = _require_actor()
        form = await request.form
        object_id = form.get("object_id", "")
        author_inbox = form.get("author_inbox", "")
        await services.federation.unlike_post(g.s, actor.id, object_id, author_inbox)
        return await _interaction_buttons_response(actor, object_id, author_inbox)

    @bp.post("/boost")
    async def boost():
        actor = _require_actor()
        form = await request.form
        object_id = form.get("object_id", "")
        author_inbox = form.get("author_inbox", "")
        await services.federation.boost_post(g.s, actor.id, object_id, author_inbox)
        return await _interaction_buttons_response(actor, object_id, author_inbox)

    @bp.post("/unboost")
    async def unboost():
        actor = _require_actor()
        form = await request.form
        object_id = form.get("object_id", "")
        author_inbox = form.get("author_inbox", "")
        await services.federation.unboost_post(g.s, actor.id, object_id, author_inbox)
        return await _interaction_buttons_response(actor, object_id, author_inbox)

    async def _interaction_buttons_response(actor, object_id, author_inbox):
        """Re-render interaction buttons after a like/boost action."""
        from shared.models.federation import APInteraction
        from shared.browser.app.csrf import generate_csrf_token
        from sqlalchemy import select

        svc = services.federation
        post_type, post_id = await svc._resolve_post(g.s, object_id)

        like_count = 0
        boost_count = 0
        liked_by_me = False
        boosted_by_me = False

        if post_type:
            from sqlalchemy import func as sa_func
            like_count = (await g.s.execute(
                select(sa_func.count(APInteraction.id)).where(
                    APInteraction.post_type == post_type,
                    APInteraction.post_id == post_id,
                    APInteraction.interaction_type == "like",
                )
            )).scalar() or 0
            boost_count = (await g.s.execute(
                select(sa_func.count(APInteraction.id)).where(
                    APInteraction.post_type == post_type,
                    APInteraction.post_id == post_id,
                    APInteraction.interaction_type == "boost",
                )
            )).scalar() or 0
            liked_by_me = bool((await g.s.execute(
                select(APInteraction.id).where(
                    APInteraction.actor_profile_id == actor.id,
                    APInteraction.post_type == post_type,
                    APInteraction.post_id == post_id,
                    APInteraction.interaction_type == "like",
                ).limit(1)
            )).scalar())
            boosted_by_me = bool((await g.s.execute(
                select(APInteraction.id).where(
                    APInteraction.actor_profile_id == actor.id,
                    APInteraction.post_type == post_type,
                    APInteraction.post_id == post_id,
                    APInteraction.interaction_type == "boost",
                ).limit(1)
            )).scalar())

        csrf = generate_csrf_token()
        safe_id = object_id.replace("/", "_").replace(":", "_")
        target = f"#interactions-{safe_id}"

        if liked_by_me:
            like_action = url_for("social.unlike")
            like_cls = "text-red-500 hover:text-red-600"
            like_icon = "\u2665"
        else:
            like_action = url_for("social.like")
            like_cls = "hover:text-red-500"
            like_icon = "\u2661"

        if boosted_by_me:
            boost_action = url_for("social.unboost")
            boost_cls = "text-green-600 hover:text-green-700"
        else:
            boost_action = url_for("social.boost")
            boost_cls = "hover:text-green-600"

        reply_url = url_for("social.defpage_compose_form", reply_to=object_id) if object_id else ""
        reply_sx = sx_call("federation-reply-link", url=reply_url) if reply_url else ""

        like_form = sx_call("federation-like-form",
            action=like_action, target=target, oid=object_id, ainbox=author_inbox,
            csrf=csrf, cls=f"flex items-center gap-1 {like_cls}",
            icon=like_icon, count=str(like_count))

        boost_form = sx_call("federation-boost-form",
            action=boost_action, target=target, oid=object_id, ainbox=author_inbox,
            csrf=csrf, cls=f"flex items-center gap-1 {boost_cls}",
            count=str(boost_count))

        return sx_response(sx_call("federation-interaction-buttons",
            like=like_form,
            boost=boost_form,
            reply=reply_sx or None))

    # -- Following / Followers pagination --------------------------------------

    @bp.get("/following/page")
    async def following_list_page():
        from sxc.pages.utils import _serialize_remote_actor, _serialize_actor

        actor = _require_actor()
        page = request.args.get("page", 1, type=int)
        actors_list, total = await services.federation.get_following(
            g.s, actor.preferred_username, page=page,
        )
        actor_dicts = [_serialize_remote_actor(a) for a in actors_list]
        actor_data = _serialize_actor(actor)
        parts = []
        for ad in actor_dicts:
            parts.append(sx_call("federation-actor-card-from-data",
                a=ad, actor=actor_data,
                followed_urls=[], list_type="following"))
        if len(actors_list) >= 20:
            next_url = url_for("social.following_list_page", page=page + 1)
            parts.append(sx_call("federation-scroll-sentinel", url=next_url))
        sx_src = "(<> " + " ".join(parts) + ")" if parts else ""
        return sx_response(sx_src)

    @bp.get("/followers/page")
    async def followers_list_page():
        from sxc.pages.utils import _serialize_remote_actor, _serialize_actor

        actor = _require_actor()
        page = request.args.get("page", 1, type=int)
        actors_list, total = await services.federation.get_followers_paginated(
            g.s, actor.preferred_username, page=page,
        )
        following, _ = await services.federation.get_following(
            g.s, actor.preferred_username, page=1, per_page=1000,
        )
        followed_urls = {a.actor_url for a in following}
        actor_dicts = [_serialize_remote_actor(a) for a in actors_list]
        actor_data = _serialize_actor(actor)
        parts = []
        for ad in actor_dicts:
            parts.append(sx_call("federation-actor-card-from-data",
                a=ad, actor=actor_data,
                followed_urls=list(followed_urls), list_type="followers"))
        if len(actors_list) >= 20:
            next_url = url_for("social.followers_list_page", page=page + 1)
            parts.append(sx_call("federation-scroll-sentinel", url=next_url))
        sx_src = "(<> " + " ".join(parts) + ")" if parts else ""
        return sx_response(sx_src)

    @bp.get("/actor/<int:id>/timeline")
    async def actor_timeline_page(id: int):
        actor = getattr(g, "_social_actor", None)
        before_str = request.args.get("before")
        before = None
        if before_str:
            try:
                before = datetime.fromisoformat(before_str)
            except ValueError:
                pass
        items = await services.federation.get_actor_timeline(
            g.s, id, before=before,
        )
        sx_src = _render_timeline_items(items, "actor", actor, id)
        return sx_response(sx_src)

    # -- Notifications ---------------------------------------------------------

    @bp.get("/notifications/count")
    async def notification_count():
        actor = getattr(g, "_social_actor", None)
        if not actor:
            return Response("0", content_type="text/plain")
        count = await services.federation.unread_notification_count(g.s, actor.id)
        if count > 0:
            from shared.sx.jinja_bridge import render as render_comp
            return Response(
                render_comp("notification-badge", count=str(count)),
                content_type="text/html",
            )
        return Response("", content_type="text/html")

    @bp.post("/notifications/read")
    async def mark_read():
        actor = _require_actor()
        await services.federation.mark_notifications_read(g.s, actor.id)
        return redirect(url_for("defpage_notifications"))

    return bp


def _render_timeline_items(items, timeline_type, actor, actor_id=None):
    """Render timeline pagination items as SX fragment."""
    from sxc.pages.utils import _serialize_timeline_item, _serialize_actor

    item_dicts = [_serialize_timeline_item(i) for i in items]
    actor_data = _serialize_actor(actor)

    next_url = None
    if items:
        last = items[-1]
        before = last.published.isoformat() if last.published else ""
        if timeline_type == "actor" and actor_id is not None:
            next_url = url_for("social.actor_timeline_page", id=actor_id, before=before)
        else:
            next_url = url_for(f"social.{timeline_type}_timeline_page", before=before)

    return sx_call("federation-timeline-items",
        items=item_dicts,
        timeline_type=timeline_type,
        actor=actor_data,
        next_url=next_url)
