import { and, eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { account_members } from "@/lib/db/schema"

export type AccountRole = "owner" | "member" | "viewer"

export type AccountContext = {
  /** The logged-in user. */
  userId: string
  /** Whose portfolio the user operates on — themselves if they're an owner. */
  ownerId: string
  role: AccountRole
  isOwner: boolean
  /** Owners and members can write; viewers are read-only. */
  canWrite: boolean
}

/**
 * Resolve the account a user operates under (TEAM ACCESS).
 *
 * If the user is an ACTIVE member of another owner's account, they act on that
 * owner's data; otherwise they own their own account. A user can be an active
 * member of at most one account. This is the single source of truth for team
 * scoping — data queries must scope by `ownerId`, not the raw session user id.
 *
 * Fails safe: on any error it returns the user as their own owner (they only
 * ever see their own data), never someone else's.
 */
export async function getAccountContext(userId: string): Promise<AccountContext> {
  try {
    const membership = await db.query.account_members.findFirst({
      where: and(eq(account_members.member_id, userId), eq(account_members.status, "active")),
    })
    if (membership) {
      const role: AccountRole = membership.role === "viewer" ? "viewer" : "member"
      return {
        userId,
        ownerId: membership.owner_id,
        role,
        isOwner: false,
        canWrite: role !== "viewer",
      }
    }
  } catch {
    // fall through to self-owned context
  }
  return { userId, ownerId: userId, role: "owner", isOwner: true, canWrite: true }
}

/** The user_id that data queries/ownership checks should be scoped by. */
export async function getEffectiveOwnerId(userId: string): Promise<string> {
  return (await getAccountContext(userId)).ownerId
}