siftlode/backend/app/routes/me.py

from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException, Request
from pydantic import BaseModel
from sqlalchemy import func, select
from sqlalchemy.orm import Session

from app.auth import (
    count_admins,
    count_pending_activations,
    current_user,
    google_enabled,
    has_read_scope,
    has_write_scope,
    is_allowed,
    optional_current_user,
    purge_user,
)
from app import email as email_mod
from app import sysconfig
from app.db import get_db
from app.models import Invite, User

router = APIRouter(prefix="/api/me", tags=["me"])


@router.get("/accounts")
def my_accounts(
    request: Request,
    user: User = Depends(current_user),
    db: Session = Depends(get_db),
) -> list[dict]:
    """The accounts that have authenticated in this browser session (switchable without a
    new Google sign-in). The active one is flagged."""
    ids = request.session.get("account_ids") or [user.id]
    rows = {u.id: u for u in db.query(User).filter(User.id.in_(ids)).all()}
    out = []
    for uid in ids:  # preserve recency order from the session
        u = rows.get(uid)
        if u is not None:
            out.append(
                {
                    "id": u.id,
                    "email": u.email,
                    "display_name": u.display_name,
                    "avatar_url": u.avatar_url,
                    "active": u.id == user.id,
                }
            )
    return out


class SwitchAccountIn(BaseModel):
    user_id: int


@router.post("/switch")
def switch_account(
    body: SwitchAccountIn,
    request: Request,
    user: User = Depends(current_user),
    db: Session = Depends(get_db),
) -> dict:
    """Switch the active account to another one already authenticated in this browser. No
    Google round-trip — but only accounts present in the session list (proof they signed in
    here) are allowed, and access is re-checked in case the invite was revoked since."""
    target = body.user_id
    if target not in (request.session.get("account_ids") or []):
        raise HTTPException(status_code=403, detail="Not an account you've signed into here.")
    u = db.get(User, target)
    if u is None:
        raise HTTPException(status_code=404, detail="That account no longer exists.")
    if not is_allowed(db, u.email):
        raise HTTPException(status_code=403, detail="That account no longer has access.")
    if u.is_suspended:
        # Don't make a suspended account the active one — the next request's current_user would
        # see the suspension and clear the WHOLE wallet session, logging out every account here.
        raise HTTPException(status_code=403, detail="That account is suspended.")
    # Same reasoning for a REVOKED session (a password reset/change or "log out everywhere" bumped the
    # account's epoch): making it the session default would trip current_user's epoch check on the next
    # request and clear the whole wallet. Mirror the suspend guard — drop the stale account from the
    # switch list and refuse, rather than logging everyone out. (B-core-9)
    epochs = request.session.get("epochs") or {}
    if int(epochs.get(str(target), 0)) != (u.session_epoch or 0):
        request.session["account_ids"] = [
            a for a in (request.session.get("account_ids") or []) if a != target
        ]
        raise HTTPException(
            status_code=403, detail="That account was signed out elsewhere — sign in again."
        )
    request.session["user_id"] = target
    return {"ok": True, "user_id": target}


@router.get("")
def get_me(
    user: User | None = Depends(optional_current_user), db: Session = Depends(get_db)
) -> dict:
    # The app's bootstrap probe: return 200 with `authenticated: False` when logged out (rather
    # than 401) so the public landing never logs a failed /api/me to the browser console. Other
    # protected endpoints still 401, so mid-session expiry is still caught by the global handler.
    if user is None:
        return {"authenticated": False}
    pending_invites = 0
    pending_activations = 0
    # Admin-only, because it drives an operator warning: email is fail-soft, so a half-filled SMTP
    # config costs verification links, password resets and access-request notices with nothing
    # visible anywhere. Surfacing it here puts the warning on the screens where onboarding happens.
    email_configured = True
    if user.role == "admin":
        pending_invites = (
            db.scalar(select(func.count()).select_from(Invite).where(Invite.status == "pending"))
            or 0
        )
        # Counted separately from pending_invites rather than folded into it: the two are different
        # facts (a request awaiting a decision vs a decided address whose sign-up never got let in),
        # and quietly widening one number would make an existing field mean something new.
        pending_activations = count_pending_activations(db)
        email_configured = email_mod.email_enabled(db)  # this request's session; no second connect
    return {
        "authenticated": True,
        "id": user.id,
        "email": user.email,
        "display_name": user.display_name,
        "avatar_url": user.avatar_url,
        "role": user.role,
        "is_demo": user.is_demo,
        "has_google": user.google_sub is not None,
        # The address Google answers with, when it DIFFERS from the account's own. Same string for
        # most people, and then this is None so no surface has to decide whether to show it — the
        # comparison lives here, once, instead of in every consumer.
        "google_email": (
            user.google_email if user.google_email and user.google_email != user.email else None
        ),
        "has_password": user.password_hash is not None,
        # Instance-wide: whether Google sign-in / YouTube connect is available at all (the UI hides
        # YouTube-access affordances and the onboarding nudge when it isn't configured).
        "google_enabled": google_enabled(db),
        # Whether the optional Plex module is enabled (UI shows the Plex feed source when so).
        "plex_enabled": sysconfig.get_bool(db, "plex_enabled"),
        "can_read": has_read_scope(user),
        "can_write": has_write_scope(user),
        "pending_invites": pending_invites,
        # Sign-ups an admin still has to let in (roadmap UX-25): approved BEFORE they registered, so
        # nothing ever reached the Access-requests queue and the badge used to read zero.
        "pending_activations": pending_activations,
        "email_configured": email_configured,
        "preferences": user.preferences or {},
    }


@router.delete("/account")
def delete_my_account(
    request: Request,
    background: BackgroundTasks,
    user: User = Depends(current_user),
    db: Session = Depends(get_db),
) -> dict:
    """GDPR self-service erasure: permanently delete the signed-in account and ALL its personal
    data — OAuth tokens, subscriptions, tags, watch/save/hide states, playlists, notifications —
    which all cascade on the users row. Quota-audit events are kept but anonymised (FK SET NULL).
    The shared demo account can't be deleted, and the last remaining admin can't delete itself
    (that would lock everyone out of the admin surfaces)."""
    if user.is_demo:
        raise HTTPException(status_code=403, detail="The shared demo account can't be deleted.")
    if user.role == "admin" and count_admins(db) <= 1:
        raise HTTPException(
            status_code=400,
            detail="You're the only admin — promote another admin before deleting your account.",
        )
    user_id = user.id
    # Full erasure (cascades) + access-request cleanup + Google-grant revocation; shared with the
    # admin delete path. Capture the id first — `user` is detached once purge_user deletes the row.
    purge_user(db, user, background)
    # Drop this account from the browser session; switch to another signed-in account if any.
    remaining = [a for a in (request.session.get("account_ids") or []) if a != user_id]
    if remaining:
        request.session["account_ids"] = remaining
        request.session["user_id"] = remaining[-1]
    else:
        request.session.clear()
    return {"deleted": True}


@router.put("/preferences")
def update_preferences(
    preferences: dict,
    user: User = Depends(current_user),
    db: Session = Depends(get_db),
) -> dict:
    # Merge so partial updates don't wipe other keys.
    merged = dict(user.preferences or {})
    merged.update(preferences)
    user.preferences = merged
    db.add(user)
    db.commit()
    return {"preferences": merged}