"""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, render_template, Response

from shared.services.registry import services

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 -------------------------------------------------------------

    @bp.get("/")
    async def home_timeline():
        if not g.get("user"):
            return redirect(url_for("auth.login_form"))
        actor = _require_actor()
        items = await services.federation.get_home_timeline(g.s, actor.id)
        return await render_template(
            "federation/timeline.html",
            items=items,
            timeline_type="home",
            actor=actor,
        )

    @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,
        )
        return await render_template(
            "federation/_timeline_items.html",
            items=items,
            timeline_type="home",
            actor=actor,
        )

    @bp.get("/public")
    async def public_timeline():
        items = await services.federation.get_public_timeline(g.s)
        actor = getattr(g, "_social_actor", None)
        return await render_template(
            "federation/timeline.html",
            items=items,
            timeline_type="public",
            actor=actor,
        )

    @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)
        return await render_template(
            "federation/_timeline_items.html",
            items=items,
            timeline_type="public",
            actor=actor,
        )

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

    @bp.get("/compose")
    async def compose_form():
        actor = _require_actor()
        reply_to = request.args.get("reply_to")
        return await render_template(
            "federation/compose.html",
            actor=actor,
            reply_to=reply_to,
        )

    @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("social.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("social.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("social.home_timeline"))

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

    @bp.get("/search")
    async def search():
        actor = getattr(g, "_social_actor", None)
        query = request.args.get("q", "").strip()
        actors = []
        total = 0
        followed_urls: set[str] = set()
        if query:
            actors, total = await services.federation.search_actors(g.s, query)
            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}
        return await render_template(
            "federation/search.html",
            query=query,
            actors=actors,
            total=total,
            page=1,
            followed_urls=followed_urls,
            actor=actor,
        )

    @bp.get("/search/page")
    async def search_page():
        actor = getattr(g, "_social_actor", None)
        query = request.args.get("q", "").strip()
        page = request.args.get("page", 1, type=int)
        actors = []
        total = 0
        followed_urls: set[str] = set()
        if query:
            actors, 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}
        return await render_template(
            "federation/_search_results.html",
            actors=actors,
            total=total,
            page=page,
            query=query,
            followed_urls=followed_urls,
            actor=actor,
        )

    @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("HX-Request"):
            return await _actor_card_response(actor, remote_actor_url, is_followed=True)
        return redirect(request.referrer or url_for("social.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("HX-Request"):
            return await _actor_card_response(actor, remote_actor_url, is_followed=False)
        return redirect(request.referrer or url_for("social.search"))

    async def _actor_card_response(actor, remote_actor_url, is_followed):
        """Re-render a single actor card after follow/unfollow via HTMX."""
        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()
        # Detect list context from referer
        referer = request.referrer or ""
        if "/followers" in referer:
            list_type = "followers"
        else:
            list_type = "following"
        return await render_template(
            "federation/_actor_list_items.html",
            actors=[remote_dto],
            total=0,
            page=1,
            list_type=list_type,
            followed_urls=followed_urls,
            actor=actor,
        )

    # -- 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 updated buttons for HTMX
        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, APRemotePost, APActivity
        from sqlalchemy import select
        from shared.services.federation_impl import SqlFederationService

        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())

        return await render_template(
            "federation/_interaction_buttons.html",
            item_object_id=object_id,
            item_author_inbox=author_inbox,
            like_count=like_count,
            boost_count=boost_count,
            liked_by_me=liked_by_me,
            boosted_by_me=boosted_by_me,
            actor=actor,
        )

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

    @bp.get("/following")
    async def following_list():
        actor = _require_actor()
        actors, total = await services.federation.get_following(
            g.s, actor.preferred_username,
        )
        return await render_template(
            "federation/following.html",
            actors=actors,
            total=total,
            page=1,
            actor=actor,
        )

    @bp.get("/following/page")
    async def following_list_page():
        actor = _require_actor()
        page = request.args.get("page", 1, type=int)
        actors, total = await services.federation.get_following(
            g.s, actor.preferred_username, page=page,
        )
        return await render_template(
            "federation/_actor_list_items.html",
            actors=actors,
            total=total,
            page=page,
            list_type="following",
            followed_urls=set(),
            actor=actor,
        )

    @bp.get("/followers")
    async def followers_list():
        actor = _require_actor()
        actors, total = await services.federation.get_followers_paginated(
            g.s, actor.preferred_username,
        )
        # Build set of followed actor URLs to show Follow Back vs Unfollow
        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}
        return await render_template(
            "federation/followers.html",
            actors=actors,
            total=total,
            page=1,
            followed_urls=followed_urls,
            actor=actor,
        )

    @bp.get("/followers/page")
    async def followers_list_page():
        actor = _require_actor()
        page = request.args.get("page", 1, type=int)
        actors, 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}
        return await render_template(
            "federation/_actor_list_items.html",
            actors=actors,
            total=total,
            page=page,
            list_type="followers",
            followed_urls=followed_urls,
            actor=actor,
        )

    @bp.get("/actor/<int:id>")
    async def actor_timeline(id: int):
        actor = getattr(g, "_social_actor", None)
        # Get remote actor info
        from shared.models.federation import RemoteActor
        from sqlalchemy import select as sa_select
        remote = (
            await g.s.execute(
                sa_select(RemoteActor).where(RemoteActor.id == id)
            )
        ).scalar_one_or_none()
        if not remote:
            abort(404)
        from shared.services.federation_impl import _remote_actor_to_dto
        remote_dto = _remote_actor_to_dto(remote)
        items = await services.federation.get_actor_timeline(g.s, id)
        # Check if we follow this actor
        is_following = False
        if actor:
            from shared.models.federation import APFollowing
            existing = (
                await g.s.execute(
                    sa_select(APFollowing).where(
                        APFollowing.actor_profile_id == actor.id,
                        APFollowing.remote_actor_id == id,
                    )
                )
            ).scalar_one_or_none()
            is_following = existing is not None
        return await render_template(
            "federation/actor_timeline.html",
            remote_actor=remote_dto,
            items=items,
            is_following=is_following,
            actor=actor,
        )

    @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,
        )
        return await render_template(
            "federation/_timeline_items.html",
            items=items,
            timeline_type="actor",
            actor_id=id,
            actor=actor,
        )

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

    @bp.get("/notifications")
    async def notifications():
        actor = _require_actor()
        items = await services.federation.get_notifications(g.s, actor.id)
        await services.federation.mark_notifications_read(g.s, actor.id)
        return await render_template(
            "federation/notifications.html",
            notifications=items,
            actor=actor,
        )

    @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:
            return Response(
                f'<span class="bg-red-500 text-white text-xs rounded-full px-1.5 py-0.5">{count}</span>',
                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("social.notifications"))

    return bp