import httpx
from fastapi import APIRouter
from fastapi import Cookie
from fastapi import Depends
from fastapi import Form
from fastapi import Request
from fastapi import UploadFile
from fastapi.exceptions import HTTPException
from fastapi.responses import RedirectResponse
from loguru import logger
from sqlalchemy import func
from sqlalchemy import select
from sqlalchemy.orm import joinedload

from app import activitypub as ap
from app import boxes
from app import models
from app import templates
from app.actor import LOCAL_ACTOR
from app.actor import fetch_actor
from app.actor import get_actors_metadata
from app.boxes import get_inbox_object_by_ap_id
from app.boxes import get_outbox_object_by_ap_id
from app.boxes import send_follow
from app.config import EMOJIS
from app.config import generate_csrf_token
from app.config import session_serializer
from app.config import verify_csrf_token
from app.config import verify_password
from app.database import AsyncSession
from app.database import get_db_session
from app.lookup import lookup
from app.uploads import save_upload
from app.utils import pagination
from app.utils.emoji import EMOJIS_BY_NAME


def user_session_or_redirect(
    request: Request,
    session: str | None = Cookie(default=None),
) -> None:
    _RedirectToLoginPage = HTTPException(
        status_code=302,
        headers={"Location": request.url_for("login") + f"?redirect={request.url}"},
    )

    if not session:
        raise _RedirectToLoginPage

    try:
        loaded_session = session_serializer.loads(session, max_age=3600 * 12)
    except Exception:
        raise _RedirectToLoginPage

    if not loaded_session.get("is_logged_in"):
        raise _RedirectToLoginPage

    return None


router = APIRouter(
    dependencies=[Depends(user_session_or_redirect)],
)
unauthenticated_router = APIRouter()


@router.get("/")
async def admin_index(
    request: Request,
    db_session: AsyncSession = Depends(get_db_session),
) -> templates.TemplateResponse:
    return await templates.render_template(
        db_session, request, "index.html", {"request": request}
    )


@router.get("/lookup")
async def get_lookup(
    request: Request,
    query: str | None = None,
    db_session: AsyncSession = Depends(get_db_session),
) -> templates.TemplateResponse | RedirectResponse:
    error = None
    ap_object = None
    actors_metadata = {}
    if query:
        requested_object = await boxes.get_anybox_object_by_ap_id(db_session, query)
        if requested_object:
            if (
                requested_object.ap_type == "Create"
                and requested_object.relates_to_anybox_object
            ):
                query = requested_object.relates_to_anybox_object.ap_id
            return RedirectResponse(
                request.url_for("admin_object") + f"?ap_id={query}",
                status_code=302,
            )
        # TODO(ts): redirect to admin_profile if the actor is in DB

        try:
            ap_object = await lookup(db_session, query)
        except httpx.TimeoutException:
            error = ap.FetchErrorTypeEnum.TIMEOUT
        except (ap.ObjectNotFoundError, ap.ObjectIsGoneError):
            error = ap.FetchErrorTypeEnum.NOT_FOUND
        except Exception:
            logger.exception(f"Failed to lookup {query}")
            error = ap.FetchErrorTypeEnum.INTERNAL_ERROR
        else:
            if ap_object.ap_type in ap.ACTOR_TYPES:
                actors_metadata = await get_actors_metadata(
                    db_session, [ap_object]  # type: ignore
                )
            else:
                actors_metadata = await get_actors_metadata(
                    db_session, [ap_object.actor]  # type: ignore
                )
    return await templates.render_template(
        db_session,
        request,
        "lookup.html",
        {
            "query": query,
            "ap_object": ap_object,
            "actors_metadata": actors_metadata,
            "error": error,
        },
    )


@router.get("/new")
async def admin_new(
    request: Request,
    query: str | None = None,
    in_reply_to: str | None = None,
    db_session: AsyncSession = Depends(get_db_session),
) -> templates.TemplateResponse:
    content = ""
    in_reply_to_object = None
    if in_reply_to:
        in_reply_to_object = await boxes.get_anybox_object_by_ap_id(
            db_session, in_reply_to
        )

        # Add mentions to the initial note content
        if not in_reply_to_object:
            raise ValueError(f"Unknown object {in_reply_to=}")
        if in_reply_to_object.actor.ap_id != LOCAL_ACTOR.ap_id:
            content += f"{in_reply_to_object.actor.handle} "
        for tag in in_reply_to_object.tags:
            if tag.get("type") == "Mention" and tag["name"] != LOCAL_ACTOR.handle:
                mentioned_actor = await fetch_actor(db_session, tag["href"])
                content += f"{mentioned_actor.handle} "

    return await templates.render_template(
        db_session,
        request,
        "admin_new.html",
        {
            "in_reply_to_object": in_reply_to_object,
            "content": content,
            "visibility_choices": [
                (v.name, ap.VisibilityEnum.get_display_name(v))
                for v in ap.VisibilityEnum
            ],
            "emojis": EMOJIS.split(" "),
            "custom_emojis": sorted(
                [dat for name, dat in EMOJIS_BY_NAME.items()],
                key=lambda obj: obj["name"],
            ),
        },
    )


@router.get("/bookmarks")
async def admin_bookmarks(
    request: Request,
    db_session: AsyncSession = Depends(get_db_session),
) -> templates.TemplateResponse:
    stream = (
        (
            await db_session.scalars(
                select(models.InboxObject)
                .where(
                    models.InboxObject.ap_type.in_(
                        ["Note", "Article", "Video", "Announce"]
                    ),
                    models.InboxObject.is_bookmarked.is_(True),
                    models.InboxObject.is_deleted.is_(False),
                )
                .options(
                    joinedload(models.InboxObject.relates_to_inbox_object),
                    joinedload(models.InboxObject.relates_to_outbox_object).options(
                        joinedload(
                            models.OutboxObject.outbox_object_attachments
                        ).options(joinedload(models.OutboxObjectAttachment.upload)),
                    ),
                    joinedload(models.InboxObject.actor),
                )
                .order_by(models.InboxObject.ap_published_at.desc())
                .limit(20)
            )
        )
        .unique()
        .all()
    )
    return await templates.render_template(
        db_session,
        request,
        "admin_stream.html",
        {
            "stream": stream,
        },
    )


@router.get("/stream")
async def admin_stream(
    request: Request,
    db_session: AsyncSession = Depends(get_db_session),
    cursor: str | None = None,
) -> templates.TemplateResponse:
    where = [
        models.InboxObject.is_hidden_from_stream.is_(False),
        models.InboxObject.is_deleted.is_(False),
    ]
    if cursor:
        where.append(
            models.InboxObject.ap_published_at < pagination.decode_cursor(cursor)
        )

    page_size = 20
    remaining_count = await db_session.scalar(
        select(func.count(models.InboxObject.id)).where(*where)
    )
    q = select(models.InboxObject).where(*where)

    inbox = (
        (
            await db_session.scalars(
                q.options(
                    joinedload(models.InboxObject.relates_to_inbox_object).options(
                        joinedload(models.InboxObject.actor)
                    ),
                    joinedload(models.InboxObject.relates_to_outbox_object).options(
                        joinedload(
                            models.OutboxObject.outbox_object_attachments
                        ).options(joinedload(models.OutboxObjectAttachment.upload)),
                    ),
                    joinedload(models.InboxObject.actor),
                )
                .order_by(models.InboxObject.ap_published_at.desc())
                .limit(20)
            )
        )
        .unique()
        .all()
    )

    next_cursor = (
        pagination.encode_cursor(inbox[-1].ap_published_at)
        if inbox and remaining_count > page_size
        else None
    )

    actors_metadata = await get_actors_metadata(
        db_session,
        [
            inbox_object.actor
            for inbox_object in inbox
            if inbox_object.ap_type == "Follow"
        ],
    )

    return await templates.render_template(
        db_session,
        request,
        "admin_inbox.html",
        {
            "inbox": inbox,
            "actors_metadata": actors_metadata,
            "next_cursor": next_cursor,
            "show_filters": False,
        },
    )


@router.get("/inbox")
async def admin_inbox(
    request: Request,
    db_session: AsyncSession = Depends(get_db_session),
    filter_by: str | None = None,
    cursor: str | None = None,
) -> templates.TemplateResponse:
    where = [
        models.InboxObject.ap_type.not_in(
            ["Accept", "Delete", "Create", "Update", "Undo", "Read", "Add", "Remove"]
        ),
        models.InboxObject.is_deleted.is_(False),
        models.InboxObject.is_transient.is_(False),
    ]
    if filter_by:
        where.append(models.InboxObject.ap_type == filter_by)
    if cursor:
        where.append(
            models.InboxObject.ap_published_at < pagination.decode_cursor(cursor)
        )

    page_size = 20
    remaining_count = await db_session.scalar(
        select(func.count(models.InboxObject.id)).where(*where)
    )
    q = select(models.InboxObject).where(*where)

    inbox = (
        (
            await db_session.scalars(
                q.options(
                    joinedload(models.InboxObject.relates_to_inbox_object).options(
                        joinedload(models.InboxObject.actor)
                    ),
                    joinedload(models.InboxObject.relates_to_outbox_object).options(
                        joinedload(
                            models.OutboxObject.outbox_object_attachments
                        ).options(joinedload(models.OutboxObjectAttachment.upload)),
                    ),
                    joinedload(models.InboxObject.actor),
                )
                .order_by(models.InboxObject.ap_published_at.desc())
                .limit(20)
            )
        )
        .unique()
        .all()
    )

    next_cursor = (
        pagination.encode_cursor(inbox[-1].ap_published_at)
        if inbox and remaining_count > page_size
        else None
    )

    actors_metadata = await get_actors_metadata(
        db_session,
        [
            inbox_object.actor
            for inbox_object in inbox
            if inbox_object.ap_type == "Follow"
        ],
    )

    return await templates.render_template(
        db_session,
        request,
        "admin_inbox.html",
        {
            "inbox": inbox,
            "actors_metadata": actors_metadata,
            "next_cursor": next_cursor,
            "show_filters": True,
        },
    )


@router.get("/outbox")
async def admin_outbox(
    request: Request,
    db_session: AsyncSession = Depends(get_db_session),
    filter_by: str | None = None,
    cursor: str | None = None,
) -> templates.TemplateResponse:
    where = [
        models.OutboxObject.ap_type.not_in(["Accept", "Delete", "Update"]),
        models.OutboxObject.is_deleted.is_(False),
        models.OutboxObject.is_transient.is_(False),
    ]
    if filter_by:
        where.append(models.OutboxObject.ap_type == filter_by)
    if cursor:
        where.append(
            models.OutboxObject.ap_published_at < pagination.decode_cursor(cursor)
        )

    page_size = 20
    remaining_count = await db_session.scalar(
        select(func.count(models.OutboxObject.id)).where(*where)
    )
    q = select(models.OutboxObject).where(*where)

    outbox = (
        (
            await db_session.scalars(
                q.options(
                    joinedload(models.OutboxObject.relates_to_inbox_object).options(
                        joinedload(models.InboxObject.actor),
                    ),
                    joinedload(models.OutboxObject.relates_to_outbox_object),
                    joinedload(models.OutboxObject.relates_to_actor),
                    joinedload(models.OutboxObject.outbox_object_attachments).options(
                        joinedload(models.OutboxObjectAttachment.upload)
                    ),
                )
                .order_by(models.OutboxObject.ap_published_at.desc())
                .limit(page_size)
            )
        )
        .unique()
        .all()
    )

    next_cursor = (
        pagination.encode_cursor(outbox[-1].ap_published_at)
        if outbox and remaining_count > page_size
        else None
    )

    actors_metadata = await get_actors_metadata(
        db_session,
        [
            outbox_object.relates_to_actor
            for outbox_object in outbox
            if outbox_object.relates_to_actor
        ],
    )

    return await templates.render_template(
        db_session,
        request,
        "admin_outbox.html",
        {
            "actors_metadata": actors_metadata,
            "outbox": outbox,
            "next_cursor": next_cursor,
        },
    )


@router.get("/notifications")
async def get_notifications(
    request: Request, db_session: AsyncSession = Depends(get_db_session)
) -> templates.TemplateResponse:
    notifications = (
        (
            await db_session.scalars(
                select(models.Notification)
                .options(
                    joinedload(models.Notification.actor),
                    joinedload(models.Notification.inbox_object),
                    joinedload(models.Notification.outbox_object).options(
                        joinedload(
                            models.OutboxObject.outbox_object_attachments
                        ).options(joinedload(models.OutboxObjectAttachment.upload)),
                    ),
                    joinedload(models.Notification.webmention),
                )
                .order_by(models.Notification.created_at.desc())
            )
        )
        .unique()
        .all()
    )
    actors_metadata = await get_actors_metadata(
        db_session, [notif.actor for notif in notifications if notif.actor]
    )

    for notif in notifications:
        notif.is_new = False
    await db_session.commit()

    return await templates.render_template(
        db_session,
        request,
        "notifications.html",
        {
            "notifications": notifications,
            "actors_metadata": actors_metadata,
        },
    )


@router.get("/object")
async def admin_object(
    request: Request,
    ap_id: str,
    db_session: AsyncSession = Depends(get_db_session),
) -> templates.TemplateResponse:
    requested_object = await boxes.get_anybox_object_by_ap_id(db_session, ap_id)
    if not requested_object:
        raise HTTPException(status_code=404)

    replies_tree = await boxes.get_replies_tree(db_session, requested_object)

    return await templates.render_template(
        db_session,
        request,
        "object.html",
        {"replies_tree": replies_tree},
    )


@router.get("/profile")
async def admin_profile(
    request: Request,
    actor_id: str,
    db_session: AsyncSession = Depends(get_db_session),
) -> templates.TemplateResponse:
    actor = (
        await db_session.execute(
            select(models.Actor).where(models.Actor.ap_id == actor_id)
        )
    ).scalar_one_or_none()
    if not actor:
        raise HTTPException(status_code=404)

    actors_metadata = await get_actors_metadata(db_session, [actor])

    inbox_objects = (
        (
            await db_session.scalars(
                select(models.InboxObject)
                .where(
                    models.InboxObject.is_deleted.is_(False),
                    models.InboxObject.actor_id == actor.id,
                    models.InboxObject.ap_type.in_(
                        ["Note", "Article", "Video", "Page", "Announce"]
                    ),
                )
                .options(
                    joinedload(models.InboxObject.relates_to_inbox_object).options(
                        joinedload(models.InboxObject.actor)
                    ),
                    joinedload(models.InboxObject.relates_to_outbox_object).options(
                        joinedload(
                            models.OutboxObject.outbox_object_attachments
                        ).options(joinedload(models.OutboxObjectAttachment.upload)),
                    ),
                    joinedload(models.InboxObject.actor),
                )
                .order_by(models.InboxObject.ap_published_at.desc())
            )
        )
        .unique()
        .all()
    )

    return await templates.render_template(
        db_session,
        request,
        "admin_profile.html",
        {
            "actors_metadata": actors_metadata,
            "actor": actor,
            "inbox_objects": inbox_objects,
        },
    )


@router.post("/actions/follow")
async def admin_actions_follow(
    request: Request,
    ap_actor_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    print(f"Following {ap_actor_id}")
    await send_follow(db_session, ap_actor_id)
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/delete")
async def admin_actions_delete(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    await boxes.send_delete(db_session, ap_object_id)
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/like")
async def admin_actions_like(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    await boxes.send_like(db_session, ap_object_id)
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/undo")
async def admin_actions_undo(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    await boxes.send_undo(db_session, ap_object_id)
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/announce")
async def admin_actions_announce(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    await boxes.send_announce(db_session, ap_object_id)
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/bookmark")
async def admin_actions_bookmark(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    inbox_object = await get_inbox_object_by_ap_id(db_session, ap_object_id)
    if not inbox_object:
        raise ValueError("Should never happen")
    inbox_object.is_bookmarked = True
    await db_session.commit()
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/unbookmark")
async def admin_actions_unbookmark(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    inbox_object = await get_inbox_object_by_ap_id(db_session, ap_object_id)
    if not inbox_object:
        raise ValueError("Should never happen")
    inbox_object.is_bookmarked = False
    await db_session.commit()
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/pin")
async def admin_actions_pin(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    outbox_object = await get_outbox_object_by_ap_id(db_session, ap_object_id)
    if not outbox_object:
        raise ValueError("Should never happen")
    outbox_object.is_pinned = True
    await db_session.commit()
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/unpin")
async def admin_actions_unpin(
    request: Request,
    ap_object_id: str = Form(),
    redirect_url: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    outbox_object = await get_outbox_object_by_ap_id(db_session, ap_object_id)
    if not outbox_object:
        raise ValueError("Should never happen")
    outbox_object.is_pinned = False
    await db_session.commit()
    return RedirectResponse(redirect_url, status_code=302)


@router.post("/actions/new")
async def admin_actions_new(
    request: Request,
    files: list[UploadFile] = [],
    content: str = Form(),
    redirect_url: str = Form(),
    in_reply_to: str | None = Form(None),
    content_warning: str | None = Form(None),
    is_sensitive: bool = Form(False),
    visibility: str = Form(),
    poll_type: str | None = Form(None),
    name: str | None = Form(None),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    # XXX: for some reason, no files restuls in an empty single file
    uploads = []
    raw_form_data = await request.form()
    if len(files) >= 1 and files[0].filename:
        for f in files:
            upload = await save_upload(db_session, f)
            uploads.append((upload, f.filename, raw_form_data.get("alt_" + f.filename)))

    ap_type = "Note"

    poll_duration_in_minutes = None
    poll_answers = None
    if poll_type:
        ap_type = "Question"
        poll_answers = []
        for i in ["1", "2", "3", "4"]:
            if answer := raw_form_data.get(f"poll_answer_{i}"):
                poll_answers.append(answer)

        if not poll_answers or len(poll_answers) < 2:
            raise ValueError("Question must have at least 2 answers")

        poll_duration_in_minutes = int(raw_form_data["poll_duration"])
    elif name:
        ap_type = "Article"

    public_id = await boxes.send_create(
        db_session,
        ap_type=ap_type,
        source=content,
        uploads=uploads,
        in_reply_to=in_reply_to or None,
        visibility=ap.VisibilityEnum[visibility],
        content_warning=content_warning or None,
        is_sensitive=True if content_warning else is_sensitive,
        poll_type=poll_type,
        poll_answers=poll_answers,
        poll_duration_in_minutes=poll_duration_in_minutes,
        name=name,
    )
    return RedirectResponse(
        request.url_for("outbox_by_public_id", public_id=public_id),
        status_code=302,
    )


@router.post("/actions/vote")
async def admin_actions_vote(
    request: Request,
    redirect_url: str = Form(),
    in_reply_to: str = Form(),
    csrf_check: None = Depends(verify_csrf_token),
    db_session: AsyncSession = Depends(get_db_session),
) -> RedirectResponse:
    form_data = await request.form()
    names = form_data.getlist("name")
    logger.info(f"{names=}")
    await boxes.send_vote(
        db_session,
        in_reply_to=in_reply_to,
        names=names,
    )
    return RedirectResponse(redirect_url, status_code=302)


@unauthenticated_router.get("/login")
async def login(
    request: Request,
    db_session: AsyncSession = Depends(get_db_session),
) -> templates.TemplateResponse:
    return await templates.render_template(
        db_session,
        request,
        "login.html",
        {
            "csrf_token": generate_csrf_token(),
            "redirect": request.query_params.get("redirect", ""),
        },
    )


@unauthenticated_router.post("/login")
async def login_validation(
    request: Request,
    password: str = Form(),
    redirect: str | None = Form(None),
    csrf_check: None = Depends(verify_csrf_token),
) -> RedirectResponse:
    if not verify_password(password):
        raise HTTPException(status_code=401)

    resp = RedirectResponse(redirect or "/admin/stream", status_code=302)
    resp.set_cookie("session", session_serializer.dumps({"is_logged_in": True}))  # type: ignore  # noqa: E501

    return resp


@router.get("/logout")
async def logout(
    request: Request,
) -> RedirectResponse:
    resp = RedirectResponse(request.url_for("index"), status_code=302)
    resp.set_cookie("session", session_serializer.dumps({"is_logged_in": False}))  # type: ignore  # noqa: E501
    return resp