// The ports of the account module. The use cases (export.ts, deletion.ts) are pure TypeScript over
// these; adapters/store.ts implements the store over kit-data, and the composition roots bind the
// two tokens.

import { type Container, type Registry, token } from "@conusai-kit/core"
import type { AccountDataContribution, OrgRole } from "@conusai-kit/tenancy"
import type { DeletionState, DeletionStep, RevocationState } from "../contract/entities.js"

export interface OrganizationRef {
  readonly slug: string
  readonly name: string
}

/** One organization the person belongs to, with what a deletion has to know about it. */
export interface AccountMembership extends OrganizationRef {
  readonly orgId: string
  readonly role: OrgRole
  /** Owners of the organization, the person included. */
  readonly owners: number
  /** Members of the organization, the person included. */
  readonly members: number
}

export interface DeletionRecord {
  readonly userId: string
  readonly state: DeletionState
  readonly pending: readonly string[]
  readonly erased: readonly string[]
  readonly abandoned: readonly string[]
  readonly attempts: number
  readonly lastFailure: string | null
  readonly requestedAt: string
  readonly completedAt: string | null
  /** The steps before the erasures that completed (DELETION_STEPS), so a resumption skips them. */
  readonly steps: readonly DeletionStep[]
  /** The identity provider whose account the deletion ends (AccountIdentityProvider.id), or null. */
  readonly provider: string | null
}

export type DeletionPatch = Partial<Omit<DeletionRecord, "userId" | "requestedAt" | "provider">>

/**
 * One change of a ledger row, as data: what a use case asks of the store, which applies it to the
 * row's current version (`applyDeletionChange`, core/deletion.ts) and retries a concurrent change.
 * Data, not a callback, so a store in another process (the Convex profile's internal mutations)
 * applies exactly the same rule.
 */
export type DeletionChange =
  | { readonly kind: "step"; readonly step: DeletionStep }
  | { readonly kind: "erased"; readonly module: string }
  | { readonly kind: "abandoned"; readonly module: string }
  | { readonly kind: "attempt"; readonly failure: string | null }
  | { readonly kind: "completed"; readonly at: string }

/** This app's own rows about a person, and the deletion ledger. */
export interface AccountStore {
  /** The account's e-mail address, which the person types to confirm a deletion; null for no such user. */
  emailOf(userId: string): Promise<string | null>
  /** When the person signed in to the session that asks, or null for a session of somebody else, revoked or gone. */
  sessionSignedInAt(userId: string, sessionId: string): Promise<string | null>
  memberships(userId: string): Promise<readonly AccountMembership[]>
  /** The rows of this app the person can take away: profile, identities, memberships, sessions, API keys. */
  localExport(userId: string): Promise<Record<string, unknown> | null>

  deletion(userId: string): Promise<DeletionRecord | null>
  /** Deletions still erasing, oldest first. */
  openDeletions(limit: number): Promise<readonly DeletionRecord[]>
  /** Writes the ledger row, or answers the one a concurrent request wrote first. */
  startDeletion(input: {
    userId: string
    modules: readonly string[]
    provider: string | null
    at: string
  }): Promise<DeletionRecord>
  /** Applies one change to the row (a read-modify-write that retries a concurrent change); a change already made writes nothing. */
  changeDeletion(userId: string, change: DeletionChange): Promise<DeletionRecord>
  /**
   * The person's identities that still map to the account: every identity-mapping row, and the user
   * row's own provider identity unless it was detached. Empty once the identity step ran.
   */
  identities(userId: string): Promise<readonly { readonly issuer: string; readonly subject: string }[]>

  /** Revokes every session (every device) and every API key of the person. Idempotent. */
  revokeCredentials(userId: string, at: string): Promise<void>
  /**
   * Removes the identity-provider mapping and the profile from the user row, so no sign-in reaches
   * the account again (a new sign-in with the same provider identity makes a new, unrelated user).
   * The row itself stays, under the same id, until every module's erasure is confirmed. Idempotent.
   */
  detachIdentity(userId: string): Promise<void>
  /** Leaves every organization (suspending one left with no member) and deletes the user row. Idempotent. */
  removeLocalData(userId: string): Promise<void>
}

/** What the use cases run with: the store, the installed modules' shares and the container they resolve ports from. */
export interface AccountDeps {
  readonly store: AccountStore
  readonly contributions: readonly AccountDataContribution[]
  readonly container: Container
  readonly now: () => number
  readonly signal?: AbortSignal
  /**
   * The external provider whose account a deletion ends (ACCOUNT_IDENTITY_PROVIDER), when one is bound:
   * resolved only when the step runs, so a provider that cannot be built (a missing variable) holds a
   * deletion at that step instead of failing every export and deletion.
   */
  readonly identityProvider?: () => AccountIdentityProvider
}

/**
 * The credential of the request that asks, as the composition root knows it: whether a person signed
 * in to this app is behind it, and the kit session row it is bound to. A process that binds nothing
 * (the worker, a test) is a caller with no interactive session.
 */
export interface AccountCredential {
  readonly interactive: boolean
  readonly sessionId?: string
  /**
   * When the person signed in to the session that asks, for a session with no kit row (an external
   * provider's, such as Better Auth's): the provider reports it with the session it validated.
   */
  readonly signedInAt?: string
}

export const ACCOUNT_CREDENTIAL = token<AccountCredential>("account.credential")

/**
 * The app's external sign-in provider, when it owns its own accounts (Better Auth): a deletion ends
 * the person's account there before it detaches the identity, so no live provider session maps to a
 * new, empty user afterwards. The deletion records the provider's `id` when it begins, and every
 * process that may resume one (the web, the worker's sweep, the Convex profile's actions) binds the
 * same provider: a resumption without it waits at that step. The account is found by the identity
 * mapping under `issuer`, which is why the step runs before the identity is detached. `endAccount`
 * is idempotent: an account already gone is not an error. An app that binds none (OIDC, whose
 * provider account is the identity service's own) has no such step.
 */
export interface AccountIdentityProvider {
  /** The provider's name, as the ledger records it (`convex-better-auth`). */
  readonly id: string
  /** The issuer the identity mapping holds the provider's subjects under (AUTH_IDENTITY_NAMESPACE). */
  readonly issuer: string
  /** Ends the account of this provider subject, sessions first. */
  endAccount(providerSubject: string): Promise<void>
}

export const ACCOUNT_IDENTITY_PROVIDER = token<AccountIdentityProvider>("account.identityProvider")

/**
 * The store a use case runs with, when the composition root binds one: the Convex profile's actions
 * bind a store whose every method is one internal query or mutation (convex/account.ts). Unbound,
 * the store is built over the container's data source (adapters/store.ts).
 */
export const ACCOUNT_STORE = token<AccountStore>("account.store")

/** The registry the installed modules' `tenancy.account` contributions are read from. */
export const ACCOUNT_REGISTRY = token<Registry>("account.registry")

/** One revoked app session whose derived service sessions are still to be ended (the revocation outbox). */
export interface RevocationRecord {
  readonly id: string
  readonly version: number
  readonly session: string
  readonly state: RevocationState
  readonly pending: readonly string[]
  readonly delivered: readonly string[]
  readonly attempts: number
  readonly nextAttemptAt: string
  readonly claimedUntil: string | null
  readonly lastFailure: string | null
  readonly requestedAt: string
  readonly completedAt: string | null
}

export type RevocationPatch = Partial<
  Pick<
    RevocationRecord,
    "state" | "pending" | "delivered" | "attempts" | "nextAttemptAt" | "claimedUntil" | "lastFailure" | "completedAt"
  >
>

/**
 * The revocation outbox a delivery runs with, when the composition root binds one: the Convex
 * profile's actions bind a store whose every method is one internal query or mutation
 * (convex/account.ts). Unbound, it is built over the container's data source (adapters/revocations.ts).
 */
export const REVOCATION_STORE = token<RevocationStore>("account.revocations")

/** The revocation outbox. Every change is written against the row's version: a lost race writes nothing. */
export interface RevocationStore {
  /** Writes the row, claimed by the caller until `claimedUntil`; null when the session is already recorded. */
  record(input: {
    session: string
    modules: readonly string[]
    at: string
    claimedUntil: string
  }): Promise<RevocationRecord | null>
  /** Pending rows whose next attempt is due at `now` and that no live claim holds, oldest first. */
  due(now: string, limit: number): Promise<readonly RevocationRecord[]>
  /** The row with `patch` applied if it is still at `record.version`, else null (another process changed it). */
  change(record: RevocationRecord, patch: RevocationPatch): Promise<RevocationRecord | null>
  /** Removes delivered and lapsed rows that finished before `before`; answers how many. */
  purge(before: string): Promise<number>
}

/**
 * The platform's per-subject erasure and export (ADR-049), as the account module needs it: a
 * structural subset of `@conusai-kit/platform`'s `Privacy` (createPrivacy), bound by the web's
 * composition root over the deployment token (`privacy:subjects` in conusai.json). `ticketKey` is the
 * server-side secret (the deployment token) the module derives its ticket MAC key from with HKDF
 * (core/analytics.ts): the token itself never keys a MAC, and rotating it invalidates open tickets.
 * Unbound (the fake platform, a test), the analytics panel answers "unavailable".
 */
export interface AccountPrivacyRequest {
  readonly id: string
  readonly kind: "erase" | "export"
  readonly status: "pending" | "running" | "completed" | "failed" | "expired"
  readonly stores: Readonly<
    Record<
      string,
      { readonly status: string; readonly deleted?: number; readonly anonymized?: number; readonly exported?: number }
    >
  >
  readonly created_at: string
  readonly finished_at?: string | null
  readonly export_expires_at?: string | null
}

export interface AccountPrivacy {
  readonly ticketKey: string
  eraseSubject(subject: { userId: string }): Promise<{ request: AccountPrivacyRequest; created: boolean }>
  exportSubject(subject: { userId: string }): Promise<{ request: AccountPrivacyRequest; created: boolean }>
  getRequest(requestId: string): Promise<AccountPrivacyRequest>
  downloadExport(requestId: string): Promise<Record<string, unknown>>
}

export const ACCOUNT_PRIVACY = token<AccountPrivacy>("account.privacy")