"""Authentication routes for the federation app.

Ported from blog/bp/auth/routes.py — owns magic link login/logout
plus the OOB account page system (newsletters, widget pages).
"""
from __future__ import annotations

from datetime import datetime, timezone

from quart import (
    Blueprint,
    request,
    render_template,
    make_response,
    redirect,
    url_for,
    session as qsession,
    g,
    current_app,
)
from sqlalchemy import select
from sqlalchemy.exc import SQLAlchemyError

from shared.db.session import get_session
from shared.models import User, UserNewsletter
from shared.models.ghost_membership_entities import GhostNewsletter
from shared.services.widget_registry import widgets
from shared.config import config
from shared.utils import host_url
from shared.infrastructure.urls import federation_url
from shared.infrastructure.cart_identity import current_cart_identity
from shared.events import emit_activity
from shared.services.registry import services

from .services import (
    pop_login_redirect_target,
    store_login_redirect_target,
    send_magic_email,
    find_or_create_user,
    create_magic_link,
    validate_magic_link,
    validate_email,
)

SESSION_USER_KEY = "uid"

oob = {
    "oob_extends": "oob_elements.html",
    "extends": "_types/root/_index.html",
    "parent_id": "root-header-child",
    "child_id": "auth-header-child",
    "header": "_types/auth/header/_header.html",
    "parent_header": "_types/root/header/_header.html",
    "nav": "_types/auth/_nav.html",
    "main": "_types/auth/_main_panel.html",
}


def register(url_prefix="/auth"):
    auth_bp = Blueprint("auth", __name__, url_prefix=url_prefix)

    @auth_bp.context_processor
    def context():
        return {"oob": oob, "account_nav_links": widgets.account_nav}

    @auth_bp.get("/login/")
    async def login_form():
        store_login_redirect_target()
        cross_cart_sid = request.args.get("cart_sid")
        if cross_cart_sid:
            qsession["cart_sid"] = cross_cart_sid
        if g.get("user"):
            return redirect(federation_url("/"))
        return await render_template("auth/login.html")

    @auth_bp.get("/account/")
    async def account():
        from shared.browser.app.utils.htmx import is_htmx_request

        if not g.get("user"):
            return redirect(host_url(url_for("auth.login_form")))

        if not is_htmx_request():
            html = await render_template("_types/auth/index.html")
        else:
            html = await render_template("_types/auth/_oob_elements.html")

        return await make_response(html)

    @auth_bp.get("/newsletters/")
    async def newsletters():
        from shared.browser.app.utils.htmx import is_htmx_request

        if not g.get("user"):
            return redirect(host_url(url_for("auth.login_form")))

        result = await g.s.execute(
            select(GhostNewsletter).order_by(GhostNewsletter.name)
        )
        all_newsletters = result.scalars().all()

        sub_result = await g.s.execute(
            select(UserNewsletter).where(
                UserNewsletter.user_id == g.user.id,
            )
        )
        user_subs = {un.newsletter_id: un for un in sub_result.scalars().all()}

        newsletter_list = []
        for nl in all_newsletters:
            un = user_subs.get(nl.id)
            newsletter_list.append({
                "newsletter": nl,
                "un": un,
                "subscribed": un.subscribed if un else False,
            })

        nl_oob = {**oob, "main": "_types/auth/_newsletters_panel.html"}

        if not is_htmx_request():
            html = await render_template(
                "_types/auth/index.html",
                oob=nl_oob,
                newsletter_list=newsletter_list,
            )
        else:
            html = await render_template(
                "_types/auth/_oob_elements.html",
                oob=nl_oob,
                newsletter_list=newsletter_list,
            )

        return await make_response(html)

    @auth_bp.post("/newsletter/<int:newsletter_id>/toggle/")
    async def toggle_newsletter(newsletter_id: int):
        if not g.get("user"):
            return "", 401

        result = await g.s.execute(
            select(UserNewsletter).where(
                UserNewsletter.user_id == g.user.id,
                UserNewsletter.newsletter_id == newsletter_id,
            )
        )
        un = result.scalar_one_or_none()

        if un:
            un.subscribed = not un.subscribed
        else:
            un = UserNewsletter(
                user_id=g.user.id,
                newsletter_id=newsletter_id,
                subscribed=True,
            )
            g.s.add(un)

        await g.s.flush()

        return await render_template(
            "_types/auth/_newsletter_toggle.html",
            un=un,
        )

    @auth_bp.post("/start/")
    async def start_login():
        form = await request.form
        email_input = form.get("email") or ""

        is_valid, email = validate_email(email_input)
        if not is_valid:
            return (
                await render_template(
                    "auth/login.html",
                    error="Please enter a valid email address.",
                    email=email_input,
                ),
                400,
            )

        user = await find_or_create_user(g.s, email)
        token, expires = await create_magic_link(g.s, user.id)

        magic_url = host_url(url_for("auth.magic", token=token))

        email_error = None
        try:
            await send_magic_email(email, magic_url)
        except Exception as e:
            current_app.logger.error("EMAIL SEND FAILED: %r", e)
            email_error = (
                "We couldn't send the email automatically. "
                "Please try again in a moment."
            )

        return await render_template(
            "auth/check_email.html",
            email=email,
            email_error=email_error,
        )

    @auth_bp.get("/magic/<token>/")
    async def magic(token: str):
        now = datetime.now(timezone.utc)
        user_id: int | None = None

        try:
            async with get_session() as s:
                async with s.begin():
                    user, error = await validate_magic_link(s, token)

                    if error:
                        return (
                            await render_template("auth/login.html", error=error),
                            400,
                        )
                    user_id = user.id

        except Exception:
            return (
                await render_template(
                    "auth/login.html",
                    error="Could not sign you in right now. Please try again.",
                ),
                502,
            )

        assert user_id is not None

        ident = current_cart_identity()
        anon_session_id = ident.get("session_id")

        try:
            async with get_session() as s:
                async with s.begin():
                    u2 = await s.get(User, user_id)
                    if u2:
                        u2.last_login_at = now
                    if anon_session_id:
                        await emit_activity(
                            s,
                            activity_type="rose:Login",
                            actor_uri="internal:system",
                            object_type="Person",
                            object_data={
                                "user_id": user_id,
                                "session_id": anon_session_id,
                            },
                        )
        except SQLAlchemyError:
            current_app.logger.exception(
                "[auth] non-fatal DB update for user_id=%s", user_id
            )

        qsession[SESSION_USER_KEY] = user_id

        redirect_url = pop_login_redirect_target()
        return redirect(redirect_url, 303)

    @auth_bp.post("/logout/")
    async def logout():
        qsession.pop(SESSION_USER_KEY, None)
        return redirect(federation_url("/"))

    # Catch-all for widget pages — must be last to avoid shadowing specific routes
    @auth_bp.get("/<slug>/")
    async def widget_page(slug):
        from shared.browser.app.utils.htmx import is_htmx_request
        from quart import abort

        widget = widgets.account_page_by_slug(slug)
        if not widget:
            abort(404)

        if not g.get("user"):
            return redirect(host_url(url_for("auth.login_form")))

        ctx = await widget.context_fn(g.s, user_id=g.user.id)
        w_oob = {**oob, "main": widget.template}

        if not is_htmx_request():
            html = await render_template(
                "_types/auth/index.html",
                oob=w_oob,
                **ctx,
            )
        else:
            html = await render_template(
                "_types/auth/_oob_elements.html",
                oob=w_oob,
                **ctx,
            )

        return await make_response(html)

    return auth_bp