/**
 * Structural types for the cordis services this plugin consumes, plus the
 * Context face both halves share.
 *
 * The type base is the vendored `@deepseek-ai/cordis` Context (the runtime
 * DSH actually runs); the service members this plugin touches are restated
 * below as structural mirrors and combined with the base by INTERSECTION.
 * Intersection (not `declare module` augmentation) is deliberate: DSH's own
 * packages already augment `@deepseek-ai/cordis`, and the host and client
 * packages declare *different* types for the same member — host
 * `sessions: SessionStore` vs client runtime `sessions: ISessions` — so a
 * single program that re-declares them would fail interface merging
 * (TS2717). Intersecting keeps every face available and lets each call site
 * resolve against the member it needs without any module-level conflict.
 *
 * `effect`, `get`, `provide`, `inject`, `logger`, `emit`, `isolate` and the
 * event helpers come from the vendored cordis base and are intentionally NOT
 * restated here: their strict shapes are the runtime contract (e.g. an
 * effect body must return a disposer). Only the string-keyed session-feed
 * `on` overload is added, because the cordis `on` is keyed to its own
 * typed `Events` map and the harness session feed is a plain string event.
 *
 * This file must stay FREE of Node.js types (`node:http`, `node:stream`,
 * `Buffer`): it is part of the CLIENT-reachable declaration graph (the
 * `Context` in `TabComponentProps` and the `betterSidebar` augmentation),
 * so a Node import here would leak into browser-only consumer builds. The
 * webServer faces below are therefore structural mirrors with plain
 * interfaces (the host casts to real Node types at the few boundaries that
 * need them — e.g. the `ws` upgrade hook in src/index.ts).
 */
import type { Context as CordisContext } from '@deepseek-ai/cordis'
import type { BetterSidebarService } from './client/service.ts'

/** The request face route handlers see (structural subset of node's
 *  IncomingMessage: the URL/method/header reads and the async body
 *  iteration `readJsonBody` uses). */
export interface SidebarHttpRequest {
  url?: string
  method?: string
  headers: Record<string, string | string[] | undefined>
  [Symbol.asyncIterator](): AsyncIterator<string | Uint8Array>
}

/** The response face route handlers write to (structural subset of node's
 *  ServerResponse: the status/header/body writes the routes use). */
export interface SidebarHttpResponse {
  statusCode: number
  writeHead(status: number, headers?: Record<string, string>): void
  end(body?: string | Uint8Array): void
}

/** The upgrade socket face (structural subset: the destroy the fences use). */
export interface SidebarUpgradeSocket {
  destroy(): void
}

/** The upgrade head bytes (Buffer at runtime; typed as bytes so no Node
 *  global leaks into the declaration graph). */
export type SidebarUpgradeHead = Uint8Array

/** One named webserver route (mirror of the host-webserver WebRoute). */
export interface SidebarWebRoute {
  kind: 'exact' | 'prefix'
  path: string
  handler: (req: SidebarHttpRequest, res: SidebarHttpResponse) => void | Promise<void>
}

/** One exact-path HTTP upgrade registration (mirror of WebUpgradeRoute). */
export interface SidebarWebUpgradeRoute {
  path: string
  handler: (req: SidebarHttpRequest, socket: SidebarUpgradeSocket, head: SidebarUpgradeHead) => void | Promise<void>
}

/** The webServer service face this plugin uses. */
export interface SidebarWebServer {
  register(route: SidebarWebRoute): () => void
  registerUpgrade(route: SidebarWebUpgradeRoute): () => void
}

/** A published session's header slice the sidebar reads (authoritative cwd). */
export interface SidebarSessionHeader {
  cwd?: string
}

/** The host session store face (`ctx.sessions.get(id)` returns the live session). */
export interface SidebarSessionStore {
  get(id: string): {
    header: SidebarSessionHeader
    /**
     * The live session's append-only event log as an immutable snapshot.
     * Read-only access — the jobs.output route replays `job_output`
     * tool/result rows from it. (The `Session.events` property this face
     * mirrored was renamed to `snapshotEvents()` in DSH 0.1.2-alpha.4.)
     */
    snapshotEvents(): readonly SidebarSessionEvent[]
  } | undefined
}

/**
 * The web runtime service face (mirror of @deepseek-ai/dsh-web-app's
 * WebRuntimeValues): the bind-derived trust list the /api gateway's fence
 * accepts — LAN IP literals sampled when the server binds all interfaces,
 * plus explicit `--trusted-host` authorities.
 */
export interface SidebarWebRuntime {
  trustedHosts: readonly string[]
}

/** Registration options the sidebar passes to `ctx.slots.register` (subset of the real options). */
export interface SidebarSlotRegisterOptions {
  name: string
  key?: string
  id?: string
  order?: number
  label?: string | (() => string)
  /** Chain routing selector (returns the matched value, or null to pass on). */
  select?: (owner: unknown) => unknown
  priority?: number
  locale?: string
  registrant?: string
  /** Business-face factory; args depend on the slot scope. */
  // eslint-disable-next-line @typescript-eslint/no-explicit-any -- mirrors the host slots signature, where inject args are untyped; unknown[] would reject concrete-typed implementations (contravariance)
  inject?: (...args: any[]) => Record<string, unknown>
  children?: Record<string, unknown>
}

/** The client slots service face (register returns the disposer). */
export interface SidebarSlotsService {
  register(options: SidebarSlotRegisterOptions, component: unknown): () => void
  /**
   * Run a callback for each declaration lifetime of a slot (the runtime
   * SlotRegistry.inject): a no-op while the slot is undeclared, so the
   * settings section registration waits for the settings shell.
   */
  inject(key: string, callback: () => () => void): () => void
}

/** The client session list row the sidebar reads (cwd for the explorer). */
export interface SidebarSessionSummary {
  id: string
  cwd?: string
  displayTitle: string
  /** Coarse durable origin for navigation filtering (subagent children). */
  origin?: 'subagent'
  /** Durable direct parent session id (present on subagent children). */
  parentId?: string
  /** Whether the session's agent is currently running. */
  running?: boolean
}

/** One healthy subagent catalog child row (structural mirror of the runtime). */
export interface SidebarSubagentChildEntry {
  kind: 'child'
  id: string
  /** Whether the child Agent driver is running at the Host sampling boundary. */
  activity: 'running' | 'inactive'
  /** Whether a direct descendant has durable `origin: 'subagent'`. */
  hasChildren: boolean
  mode: 'one-shot' | 'continuable'
  label?: string
}

/** One unreadable catalog row (corrupt / unsupported / unavailable). */
export interface SidebarSubagentDiagnosticEntry {
  kind: 'diagnostic'
  id: string
  reason: 'corrupt' | 'unsupported' | 'unavailable'
}

/** The per-parent lazy catalog delivered through the sessions list feed. */
export interface SidebarSubagentCatalog {
  entries: Array<SidebarSubagentChildEntry | SidebarSubagentDiagnosticEntry>
  parentAvailable: boolean
  state: 'loading' | 'ready' | 'error'
  error: { code?: string; message?: string } | null
}

/** Durable parent/child address that selects subagent transport in the client. */
export interface SidebarSubagentAddress {
  parentSessionId: string
  childSessionId: string
  mode: 'one-shot' | 'continuable'
}

/** Minimal structural mirror of one session event (the subagent history tail). */
export interface SidebarSessionEvent {
  type: string
  seq: number
  time: number
  data: Record<string, unknown>
}

/** One history row: the durable event plus an optional tool presentation view. */
export interface SidebarHistoryEntry {
  event: SidebarSessionEvent
  view?: unknown
}

/** Lifecycle status set of one background job (closed wire union). */
export type SidebarJobStatus = 'running' | 'stopping' | 'completed' | 'killed' | 'failed'

/**
 * One background job as the client mirror sees it (wire `JobView` shape:
 * id/kind/label/status/detail?/startedAt/finishedAt?).
 */
export interface SidebarJobView {
  /** Registry-issued `<kind>-N` identity, stable for the job's whole life. */
  id: string
  /** Producer kind (`bash`, `pwsh`, `subagent`, …; open string by design). */
  kind: string
  /** Producer-supplied one-line label: the command, or the delegation description. */
  label: string
  /** Current lifecycle state. */
  status: SidebarJobStatus
  /** Kind-specific status detail ('exit code: 3'), present once supplied. */
  detail?: string
  /** Epoch ms when the job was registered. */
  startedAt: number
  /** Epoch ms when the job settled; absent while live. */
  finishedAt?: number
}

/** The host jobs registry face the sidebar routes touch (structural mirror of `JobRegistry`). */
export interface SidebarJobsService {
  /** Request cancellation; throws for an unknown or foreign job. */
  kill(id: string, caller?: SidebarAgent, reason?: string): 'requested' | 'already-finished'
}

/** The host agent registry face (structural mirror of the runtime `ctx.agents`). */
export interface SidebarAgentsService {
  /** The live agent registered under a session id, or undefined when not live. */
  get(id: string): SidebarAgent | undefined
  /**
   * Create a session + agent with a custom seed (mirror of the runtime
   * AgentRegistry.create) — the Side Chat thread-creation seam: the SAME
   * public seam api-proxy's session.fork and the subagent fork provider use.
   */
  create?(options: unknown): Promise<{ agent: SidebarAgent; dispose(): Promise<void> }>
  /**
   * Resume an agent on a persisted session (mirror of the runtime
   * AgentRegistry.resume) — the Side Chat cold-continuation seam after a
   * DSH restart or a closed thread.
   */
  resume?(options: unknown): Promise<{ agent: SidebarAgent; dispose(): Promise<void> }>
}

/** The host subagent runtime face (`ctx.subagents`; optional — the live
 *  batch route degrades to a 503 when the deployment lacks it). Only the
 *  read-only descendant enumeration this plugin needs is mirrored. */
export interface SidebarSubagentsService {
  /**
   * Enumerate the root's complete session-backed subagent tree in stable
   * pre-order without loading or resuming an Agent (mirror of
   * `SubagentRuntime.listDescendants`).
   */
  listDescendants(
    rootSessionId: string,
    signal?: AbortSignal,
  ): Promise<SidebarSubagentDescendantEntry[]>
}

/** One descendant row of `ctx.subagents.listDescendants` (structural mirror). */
export type SidebarSubagentDescendantEntry =
  | {
    kind: 'child'
    id: string
    activity: 'running' | 'inactive'
    hasChildren: boolean
    mode: 'one-shot' | 'continuable'
    label?: string
    parentId: string
    depth: number
  }
  | {
    kind: 'diagnostic'
    id: string
    reason: 'corrupt' | 'unsupported' | 'unavailable'
    parentId: string
    depth: number
  }

/** The host agent-presets service face (mirror of the runtime agentPresets
 *  service): resolves and mounts the preset composition a session recorded,
 *  so a resumed or forked session rebuilds the same tool/prompt world its
 *  history was produced under. */
export interface SidebarAgentPresetsService {
  /** Resolve a preset id; undefined resolves the deployment default. */
  resolve(presetId?: string): Promise<{ id: string }>
  /** Mount a preset's composition into an agent scope before publication. */
  mount(agentCtx: unknown, presetId: string): Promise<void>
}

/** The host session-title service face (mirror of the sessionTitle service). */
export interface SidebarSessionTitleService {
  /** Rename one live session's title (pins it against auto-regeneration). */
  rename(session: unknown, title: string): { title: string; eventSeq: number }
}

/**
 * The host session-persistence face (mirror of the `sessionPersistence`
 * service): durable, handle-addressed session storage.
 *
 * DSH 0.1.5 replaced the detached `inspect(id)` call with an explicit read
 * handle: `open(id, 'read')` never takes write ownership and works while
 * another process owns the session, `handle.read()` returns one contiguous
 * slice of the log, and `close()` releases it. Every cold read in this plugin
 * goes through {@link readPersistedSession} so the handle is always closed.
 */
export interface SidebarSessionPersistenceService {
  open(sessionId: string, access: 'read' | 'write'): Promise<SidebarSessionHandle>
}

/** One open channel onto a stored session (the fields this plugin reads). */
export interface SidebarSessionHandle {
  /** Immutable stored header (cwd / agentPreset live here). */
  readonly header: { cwd?: string; agentPreset?: string } & Record<string, unknown>
  /** Exact fork-inherited prefix length stored with the log. */
  readonly inheritedEventCount?: number
  /**
   * Read a slice of the valid contiguous log.
   * @param offset - first logical seq to include (defaults to 0).
   * @param length - maximum events (defaults to the rest of the log).
   */
  read(offset?: number, length?: number): Promise<{ events: readonly SidebarSessionEvent[] }>
  /** Release the handle (idempotent). */
  close(): Promise<void>
}

/** The client session list snapshot the sidebar subscribes to. */
export interface SidebarSessionList {
  current: string | undefined
  byId: Record<string, SidebarSessionSummary>
  /** Direct durable catalogs keyed by their selected parent address. */
  subagentsByParent?: Readonly<Record<string, SidebarSubagentCatalog>>
  /**
   * Background jobs per session, last-wins from the harness's `session/jobs`
   * push (a missing key is an empty set). Absent on runtime snapshots older
   * than the jobs mirror — the sidebar simply shows no job rows.
   */
  jobsBySession?: Readonly<Record<string, readonly SidebarJobView[]>>
}

/** The client sessions service face (only the list feed is needed). */
export interface SidebarSessionsService {
  list: {
    getSnapshot(): SidebarSessionList
    subscribe(fn: () => void): () => void
  }
  /**
   * Select a listed session as current (mirror of the runtime ISessions.open)
   * — used to jump back to the main agent from the topology root node.
   */
  open?(id: string): void
  /**
   * Fork a session from a completed-turn prefix of the source and resolve
   * the child session id (mirror of the runtime ISessions.fork — throws on
   * failure). The Side Chat "save as new session" action uses this to
   * promote a hidden side thread into a top-level session.
   */
  fork?(opts: { sessionId: string; atSeq?: number; increaseTitle?: boolean }): Promise<string>
  /**
   * Resolve the stable session binding of one listed session (mirror of the
   * runtime ISessions.binding); the saved-session rename uses the face's
   * behavior verbs.
   */
  binding?(id: string): {
    session: {
      rename(title: string): Promise<unknown>
    }
  } | undefined
  /**
   * Resolve an Agent-scoped context view for one session (mirror of the
   * runtime ISessions.scope) — the ticket `ctx.conversation.input.for`
   * requires to reach that session's composer.
   */
  scope(id: string): Context | undefined
  /**
   * Open a healthy catalog child through its exact direct-parent address
   * (mirror of the runtime ISessions.openSubagent).
   */
  openSubagent?(address: SidebarSubagentAddress): void
  /**
   * Resolve an already discovered direct-parent address without opening it.
   */
  subagentAddress?(id: string): SidebarSubagentAddress | undefined
  /**
   * Mark whether a catalog surface is consuming live membership updates.
   */
  setSubagentCatalogOpen?(parentSessionId: string, open: boolean): void
  /**
   * Refresh one direct-child catalog.
   */
  refreshSubagents?(parentSessionId: string): Promise<void>
}

/**
 * The client locale service face (mirror of @deepseek-ai/dsh-client-locale's
 * LocaleRuntime — only the slices the sidebar touches). The sidebar follows
 * the DSH i18n system: the active locale is the Host-backed preference
 * (`locale.preference` in settings.yaml) rather than the raw browser
 * language, and the sidebar's zh/en dictionaries register into the service's
 * namespace registry under `betterSidebar`.
 */
export interface SidebarLocaleService {
  /** Current immutable locale snapshot (uSES-safe; `active` is 'zh' | 'en' today). */
  getSnapshot(): { active: string }
  /** Subscribe to snapshot changes (locale switch or dictionary registration). */
  subscribe(fn: () => void): () => void
  /** Register one locale's dictionary for a namespace; returns the disposer. */
  register(ns: string, locale: string, dict: Record<string, string>): () => void
}

/** The composer draft face the sidebar reaches through `ctx.conversation.input`. */
export interface SidebarSessionInput {
  /** The live input store (draft read for append). `draftRev` is the machine's
   *  span-CAS revision — required to mint a structured file-reference chip. */
  state: {
    getSnapshot(): { draft: string; draftRev?: number }
  }
  /** Replace the draft text (the input machine's single public write path). */
  setDraft(text: string): void
}

/** The composer draft face the sidebar reaches through `ctx.get('conversation')`. */
export interface SidebarConversation {
  input: {
    for(actx: Context): SidebarSessionInput
  }
}

/**
 * The invariant service face (mirror of @deepseek-ai/dsh-invariants'
 * InvariantRegistry). The upstream augmentation does not reach this Context
 * (dual-cordis-instance resolution), so the register signature is restated
 * structurally, exactly like the other service faces above.
 */
export interface SidebarInvariantsService {
  /** Reserve one package's checks and install them in the service's child fiber. */
  register(
    packageName: string,
    installer: (ctx: Context, fail: (message: string) => never) => void | Promise<void>,
  ): () => void
}

/** The settings service face (mirror of @deepseek-ai/dsh-settings' SettingsProvider). */
export interface SidebarSettingsService {
  /**
   * Register one namespace schema (the resolved value layers schema defaults,
   * then the composition base, then the user document).
   */
  register<T>(
    ns: string,
    schema: unknown,
    options?: { base?: Partial<T>; applies?: 'live' | 'restart' },
  ): {
    get(): T
    watch(callback: (next: T, prev: T) => void | Promise<void>): () => void
    update(patch: object): Promise<void>
    replace(section: object): Promise<void>
  }
  /** Redacted descriptors of every registered namespace (secrets stripped). */
  describe(options?: { redactSecrets?: boolean }): Array<{
    ns: string
    value?: unknown
    base?: unknown
    user?: unknown
    applies: 'live' | 'restart'
    revision: number
  }>
  /** Service-level merge write with the revision guard (a stale writer is refused). */
  update(ns: string, patch: object, expectedRevision?: number): Promise<void>
}

/**
 * The tools service face (mirror of @deepseek-ai/dsh-tools' ToolRuntime).
 * The host half registers model-facing tools here; the registry attaches the
 * returned disposer to the contributing fiber so unloading unregisters them.
 */
export interface SidebarToolsService {
  /** Register one tool definition (raw JSON-Schema or defineTool-sugar form). */
  register(tool: unknown): () => void
}

/**
 * The agent face a tool sees on `exec.agent` (mirror of @deepseek-ai/dsh-agent's
 * Agent). Only the slices the terminal tools touch are restated: the live
 * session identity and its header cwd, both readonly.
 */
export interface SidebarAgent {
  /** The live session identity shared with the session log. */
  readonly id: string
  /** The live session this agent drives. */
  readonly session: {
    /** The session's header (validated cwd, lineage metadata). */
    readonly header: { readonly cwd?: string }
  }
}

/**
 * The shape this plugin actually consumes, intersected with the vendored
 * cordis `Context` below (see the file header for why intersection is used
 * instead of module augmentation).
 */
export interface SidebarContextShape {
  /** The webServer service face this plugin uses. */
  webServer: SidebarWebServer
  /** The session store (host `.get`) and the client list feed (`.list`) faces. */
  sessions: SidebarSessionStore & SidebarSessionsService
  /** The web runtime trust list (bind-derived). */
  webRuntime: SidebarWebRuntime
  /** The client slot registry (register/inject). */
  slots: SidebarSlotsService
  /** The settings service face (prefs persistence + namespace reads). */
  settings: SidebarSettingsService
  /** The invariant registry face. */
  invariants: SidebarInvariantsService
  /** The tool registry face. */
  tools: SidebarToolsService
  /** The client locale service face. */
  locale: SidebarLocaleService
  /** The client module system (rc.8+ chunk-loader externals). */
  modules: { import(specifier: string): Promise<unknown> }
  /** The host background-job registry (optional; routes degrade to 503). */
  jobs: SidebarJobsService
  /** The host live-agent registry (optional; side chat thread agents). */
  agents: SidebarAgentsService
  /** The host subagent runtime (optional; live topology batch route). */
  subagents: SidebarSubagentsService
  /** The host agent-presets service (optional; side chat cold resume). */
  agentPresets: SidebarAgentPresetsService
  /** The host session-title service (optional; side chat thread label pin). */
  sessionTitle: SidebarSessionTitleService
  /** The host session-persistence service (optional; side chat cold resume). */
  sessionPersistence: SidebarSessionPersistenceService
  /**
   * The client connection lifecycle (DSH 0.1.2-alpha.2+; optional so older
   * hosts and test fakes simply hide the disconnect banner): the observable
   * recovery state of the Remote transport (`undefined` before the first
   * connection outcome) and an immediate-reconnect request.
   */
  connection?: {
    state: {
      getSnapshot(): 'connected' | 'disconnected' | 'connecting' | undefined
      subscribe(listener: () => void): () => void
    }
    reconnect(): void
  }
  /** The composer draft face (client ui-conversation, lazy `ctx.get` probe). */
  conversation: SidebarConversation
  /**
   * The client-side sidebar registry: external plugins register tab types
   * and file previewers here. Provided by the client half (see
   * {@link ./client/index.tsx}); undefined on the host side.
   */
  betterSidebar: BetterSidebarService
  /**
   * String-keyed session feed subscribe (the vendored cordis `on` is keyed
   * to its typed Events map; the harness session feed is a plain string
   * event). The listener receives every appended session event with the
   * LIVE Session instance that appended it.
   */
  on(event: string, listener: (session: unknown, event: SidebarSessionEvent) => void): () => void
  /**
   * The agent's process-local assistant stream (DSH 0.1.5+): one payload per
   * `start` / `chunk` / `end` frame, carrying the emitting agent and the
   * frame. These frames are NOT session events — see
   * {@link ./assistant-live.ts} for why the plugin needs them.
   */
  on(event: 'agent/assistant-stream', listener: (payload: { agent?: unknown; frame?: unknown }) => void): () => void
}

/**
 * The Context this plugin sees: the vendored cordis Context intersected with
 * the structural service faces above. Re-exported from the package root so a
 * consumer can `import type { Context } from 'dsh-better-sidebar'`.
 */
export type Context = CordisContext & SidebarContextShape

/**
 * Consumer-facing augmentation (deliberately the only one kept): a plugin
 * that imports `Context` from `@deepseek-ai/cordis` and does
 * `import type {} from 'dsh-better-sidebar'` sees `ctx.betterSidebar`
 * without importing this package's own Context type.
 */
declare module '@deepseek-ai/cordis' {
  interface Context {
    betterSidebar: BetterSidebarService
  }
}