/**
 * UI ports (gateways) — interfaces describing *what the UI needs*, independent
 * of transport (ARCHITECTURE §1.3). React components depend on these, never on
 * `@tauri-apps/api` directly. Implemented by the Tauri adapters and by mocks.
 *
 * Signatures are intentionally minimal/skeletal for L1; later lots flesh out
 * each gateway as their use cases land. They are aligned with the planned use
 * cases (ARCHITECTURE §6) so the shape is stable.
 */

import type {
  Agent,
  AgentDrift,
  AgentProfile,
  DomainEvent,
  EmbedderEngines,
  EmbedderProfile,
  FirstRunState,
  GitBranches,
  GitCommit,
  GitFileStatus,
  GraphCommit,
  HealthReport,
  LayoutKind,
  LayoutList,
  LayoutOperation,
  LayoutTree,
  Memory,
  MemoryIndexEntry,
  MemoryLink,
  MemoryType,
  EffectivePermissions,
  PermissionSet,
  PageDirection,
  Project,
  ProjectPermissions,
  ProjectWorkState,
  ProfileAvailability,
  ResumableAgent,
  ReplyChunk,
  Skill,
  SkillScope,
  Sprint,
  Template,
  TerminalSession,
  Ticket,
  TicketChat,
  TicketCarnet,
  TicketLinkKind,
  TicketList,
  TicketPriority,
  TicketStatus,
  TurnPage,
  Unsubscribe,
} from "@/domain";

/** System-level gateway: health/ping + global domain-event subscription. */
export interface SystemGateway {
  /** Calls the backend `health` command (smoke test of the whole pipeline). */
  health(note?: string): Promise<HealthReport>;
  /** Subscribes to relayed domain events. */
  onDomainEvent(handler: (event: DomainEvent) => void): Promise<Unsubscribe>;
  /**
   * Opens a native folder picker and returns the chosen path, or `null` if the
   * user cancelled. This is the only sanctioned way to pick a folder — all call
   * sites go through this port; the Tauri plugin is only imported in the adapter.
   */
  pickFolder(): Promise<string | null>;
}

/** Input for {@link AgentGateway.createAgent}. */
export interface CreateAgentInput {
  name: string;
  profileId: string;
  initialContent?: string;
}

/**
 * Best-effort enriched details about a CLI conversation (T7), used to enrich the
 * resume popup. Both fields are optional: a missing inspector or a missing
 * transcript yields an empty object — the popup degrades to the status alone.
 */
export interface ConversationDetails {
  /** A short, best-effort label for the conversation (last topic). */
  lastTopic?: string;
  /** A best-effort cumulative token count. */
  tokenCount?: number;
}

/** Agents: create, list, read/update context, delete, launch (L6). */
export interface AgentGateway {
  /** Lists all agents belonging to the given project. */
  listAgents(projectId: string): Promise<Agent[]>;
  /**
   * Lists the agents that can be **resumed** when the project is (re)opened
   * (ARCHITECTURE §15.2): a read-only inventory of agent cells that were running
   * and/or carry a persisted conversation id at close time. Drives the
   * `ResumeProjectPanel` shown once on open; an empty list ⇒ no panel. Pure
   * inventory: no PTY is spawned by this call.
   */
  listResumableAgents(projectId: string): Promise<ResumableAgent[]>;
  /**
   * Lists the agents that currently own a live session and the cell hosting
   * each. Used to disable an agent already running in another cell (it cannot be
   * launched a second time — one live session per agent).
   */
  listLiveAgents(projectId: string): Promise<LiveAgent[]>;
  /**
   * Rebinds an already-live agent session to another visible layout cell without
   * respawning the CLI process. Used when a background agent is opened in a cell,
   * or when a live session is moved from a now-detached/closed cell.
   *
   * Backends that do not yet support agent-session rebinding may omit this
   * method; the UI will show the session as running elsewhere but cannot attach
   * it from a different cell.
   */
  attachLiveAgent?(
    projectId: string,
    agentId: string,
    nodeId: string,
  ): Promise<LiveAgent>;
  /**
   * Stops an already-live agent session without going through terminal teardown
   * commands from the Work panel. The backend owns the live-agent lifecycle.
   */
  stopLiveAgent?(projectId: string, agentId: string): Promise<StoppedLiveAgent>;
  /** Creates a new agent from scratch; returns the created agent. */
  createAgent(projectId: string, input: CreateAgentInput): Promise<Agent>;
  /**
   * Hot-swaps an agent's runtime AI profile (Chantier A). The conversation
   * history is abandoned (the product decision is "start fresh"); the agent's
   * context `.md` and project memory are preserved. When the agent has a live
   * session it is relaunched on the new profile and returned as
   * {@link TerminalSession} so the hosting cell can rebind; otherwise
   * `relaunchedSession` is absent.
   */
  changeAgentProfile(
    projectId: string,
    agentId: string,
    profileId: string,
    rows: number,
    cols: number,
  ): Promise<{ agent: Agent; relaunchedSession?: TerminalSession }>;
  /** Reads an agent's `.md` context by agent id. */
  readContext(projectId: string, agentId: string): Promise<string>;
  /** Overwrites an agent's `.md` context. */
  updateContext(projectId: string, agentId: string, content: string): Promise<void>;
  /** Removes an agent from the project. */
  deleteAgent(projectId: string, agentId: string): Promise<void>;
  /**
   * Launches the agent: opens a PTY, spawns the CLI, and wires the output stream.
   * Mirrors {@link TerminalGateway.openTerminal} but invokes `launch_agent`.
   *
   * The returned handle carries an optional {@link TerminalHandle.assignedConversationId}:
   * when the agent's profile assigns a fresh CLI conversation id on this first
   * launch (the cell had none yet), it is surfaced here so the caller can persist
   * it on the hosting leaf (`setCellConversation`) and resume on the next open.
   * Pass the leaf's current `conversationId` via {@link OpenTerminalOptions} to
   * resume an existing conversation instead.
   */
  launchAgent(
    projectId: string,
    agentId: string,
    options: OpenTerminalOptions,
    onData: (bytes: Uint8Array) => void,
  ): Promise<TerminalHandle>;
  /**
   * Re-attaches to an agent's already-running PTY (same backend mechanism as
   * {@link TerminalGateway.reattach}; agent sessions share the session-based
   * terminal commands). Used when an agent cell's view re-mounts after a
   * navigation/layout change, so the agent is never killed.
   */
  reattach(
    sessionId: string,
    onData: (bytes: Uint8Array) => void,
  ): Promise<ReattachResult>;
  /**
   * Reads best-effort {@link ConversationDetails} for an agent's conversation
   * (T7), to enrich the resume popup with the last topic + a token indicator.
   * Best-effort by contract: a missing/unsupported inspector or a missing
   * transcript resolves to an empty object (never rejects for "no details").
   */
  inspectConversation(
    projectId: string,
    agentId: string,
    conversationId: string,
  ): Promise<ConversationDetails>;
}

/** Options for opening a terminal. */
export interface OpenTerminalOptions {
  /** Working directory (typically the project root). */
  cwd: string;
  /** Initial terminal height in rows. */
  rows: number;
  /** Initial terminal width in columns. */
  cols: number;
  /**
   * Persistent CLI conversation id recorded on the hosting cell, if any. When
   * present, an agent launch **resumes** that conversation; when absent the
   * launch may *assign* a fresh id (surfaced on the returned handle). Only
   * meaningful for {@link AgentGateway.launchAgent}; ignored for plain terminals.
   */
  conversationId?: string;
  /**
   * The layout leaf (node) hosting this launch. Drives the "one live session per
   * agent" invariant backend-side: launching an agent already running in a
   * *different* node is refused (`AGENT_ALREADY_RUNNING`); the same node is
   * idempotent. Only meaningful for {@link AgentGateway.launchAgent}.
   */
  nodeId?: string;
}

/** One currently-live agent and the cell hosting it (see {@link AgentGateway.listLiveAgents}). */
export interface LiveAgent {
  /** The live agent's id. */
  agentId: string;
  /** The node (layout leaf) hosting the agent's live session. */
  nodeId: string;
  /**
   * The live PTY session id, when the backend exposes it. Required for opening
   * a background/running agent in a new visible cell without respawning it.
   */
  sessionId: string;
  /** Runtime kind backing the live agent. */
  kind: "pty" | "structured";
}

/** Result returned when the backend stops a live agent. */
export interface StoppedLiveAgent {
  agentId: string;
  sessionId: string;
  kind: "pty" | "structured";
}

/**
 * A live terminal handle returned by {@link TerminalGateway.openTerminal}.
 *
 * The output stream is delivered to the `onData` callback passed at open time
 * (over a Tauri Channel in the real adapter); the handle exposes the input/
 * control operations and a `close` that also tears the stream down.
 */
export interface TerminalHandle {
  /** Stable session id (UUID) used by the backend for this PTY. */
  readonly sessionId: string;
  /**
   * Conversation id **assigned** by an agent launch when the profile minted a
   * fresh one (the cell had none yet). Present only on handles returned by
   * {@link AgentGateway.launchAgent}; `undefined` for plain terminals, resumes,
   * or profiles without a session block. The caller persists it on the hosting
   * leaf so the next open resumes instead of re-assigning.
   */
  readonly assignedConversationId?: string;
  /** Sends bytes (xterm keystrokes) to the PTY. */
  write(data: Uint8Array): Promise<void>;
  /** Resizes the PTY. */
  resize(rows: number, cols: number): Promise<void>;
  /**
   * Detaches the **view** from the PTY without killing it: stops the local
   * output subscription so a torn-down view (navigation / layout change) stops
   * receiving bytes, while the backend PTY keeps running. The session can later
   * be re-attached via {@link TerminalGateway.reattach}.
   *
   * This is the lifecycle the view's cleanup must use — never {@link close}.
   */
  detach(): void;
  /**
   * Kills the PTY and stops the output stream. Reserved for an **explicit** user
   * action (closing the terminal); navigation must never call this.
   */
  close(): Promise<void>;
}

/**
 * The write-portal contract an agent-cell terminal talks to (ARCHITECTURE §20).
 * The portal owns the *human line* counter, the suspension flag (raised while it
 * injects a delegation) and — once the view has a live PTY — the handle it
 * writes through. The terminal view is the only effective PTY writer
 * (single-writer invariant): it relays human keystrokes and the portal injects
 * via the same handle, never a second physical writer.
 */
export interface WritePortal {
  /**
   * Reports a raw human keystroke chunk (`term.onData`) so the portal can keep
   * its line counter. Called for **every** keystroke in agent mode, including
   * while suspended (the portal decides what to count).
   */
  onHumanData(data: string): void;
  /**
   * Whether the keystroke relay to the PTY is currently suspended (the portal
   * is injecting a delegation). When `true`, the view drops keystrokes so they
   * do not race the injected text.
   */
  isSuspended(): boolean;
  /** Binds the live PTY handle so the portal can inject through it. */
  bindHandle(handle: TerminalHandle): void;
  /** Drops the handle reference (view torn down). */
  unbindHandle(): void;
}

/**
 * Terminals (L3): open a PTY with a per-session output stream, then write/
 * resize/close it through the returned {@link TerminalHandle}.
 */
export interface TerminalGateway {
  /**
   * Opens a terminal. `onData` receives every chunk of PTY output (bytes) as it
   * arrives. Resolves once the PTY is spawned and the stream is wired.
   */
  openTerminal(
    options: OpenTerminalOptions,
    onData: (bytes: Uint8Array) => void,
  ): Promise<TerminalHandle>;
  /**
   * Re-attaches to an **already-running** PTY identified by `sessionId` (after a
   * view was torn down by navigation/layout change). Returns the live handle and
   * the retained scrollback, which the caller repaints into xterm before the new
   * output stream (`onData`) starts delivering subsequent bytes. Does NOT
   * re-spawn the process.
   *
   * Rejects if the session is no longer alive (the caller then opens fresh).
   */
  reattach(
    sessionId: string,
    onData: (bytes: Uint8Array) => void,
  ): Promise<ReattachResult>;
  /**
   * Kills a live PTY by its session id, independently of any view-held handle.
   * Used when a cell's agent changes: the old PTY must be torn down even though
   * the owning {@link TerminalHandle} is private to its (unmounting) view, whose
   * cleanup only ever {@link TerminalHandle.detach}es. Best-effort: resolves even
   * if the session is already gone.
   *
   * This is the only sanctioned way to kill a PTY outside
   * {@link TerminalHandle.close}.
   */
  closeTerminal(sessionId: string): Promise<void>;
}

/** The outcome of {@link TerminalGateway.reattach}. */
export interface ReattachResult {
  /** The live terminal handle for the re-attached session. */
  handle: TerminalHandle;
  /** The retained scrollback bytes to repaint before the live stream resumes. */
  scrollback: Uint8Array;
}

/** Projects: create/open/close/list (L2). */
export interface ProjectGateway {
  /** Lists the projects known to the registry. */
  listProjects(): Promise<Project[]>;
  /** Creates a project from a root; returns the created project. */
  createProject(name: string, root: string): Promise<Project>;
  /** Opens a project by id; returns the opened project. */
  openProject(projectId: string): Promise<Project>;
  /** Closes a project by id. */
  closeProject(projectId: string): Promise<void>;
  /** Reads the shared project context stored at `.ideai/CONTEXT.md`. */
  readProjectContext(projectId: string): Promise<string>;
  /** Overwrites the shared project context stored at `.ideai/CONTEXT.md`. */
  updateProjectContext(projectId: string, content: string): Promise<void>;
}

/** Layout: load the terminal grid tree and apply mutating operations (L4). */
export interface LayoutGateway {
  /** Loads a project's layout tree (defaults to a single cell if none persisted).
   * When `layoutId` is omitted, the active layout for the project is used. */
  loadLayout(projectId: string, layoutId?: string): Promise<LayoutTree>;
  /**
   * Applies a split/merge/resize/move/setSession/setCellAgent operation; the backend persists
   * `.ideai/layout.json` and returns the resulting tree.
   * When `layoutId` is omitted, the active layout for the project is used.
   */
  mutateLayout(
    projectId: string,
    operation: LayoutOperation,
    layoutId?: string,
  ): Promise<LayoutTree>;
  /** Lists all named layouts for a project, with the current active id. */
  listLayouts(projectId: string): Promise<LayoutList>;
  /** Creates a new named layout for a project; returns the new layout id. */
  createLayout(projectId: string, name: string, kind?: LayoutKind): Promise<{ layoutId: string }>;
  /** Renames a layout. */
  renameLayout(projectId: string, layoutId: string, name: string): Promise<void>;
  /** Deletes a layout; returns the new active layout id. */
  deleteLayout(projectId: string, layoutId: string): Promise<{ activeId: string }>;
  /**
   * Sets the active layout for a project. Returns the layout id the backend
   * *actually* activated — authoritative (invariant I4): it equals the requested
   * id when valid, else the unchanged current active id (self-healing fallback
   * when the requested id was stale, e.g. after an external overwrite of
   * `layouts.json`). Callers must adopt this id rather than the one they asked for.
   */
  setActiveLayout(projectId: string, layoutId: string): Promise<{ activeId: string }>;
}

/** Git: status/commit/checkout/… (L8). */
export interface GitGateway {
  status(projectId: string): Promise<GitFileStatus[]>;
  stage(projectId: string, path: string): Promise<void>;
  unstage(projectId: string, path: string): Promise<void>;
  commit(projectId: string, message: string): Promise<GitCommit>;
  branches(projectId: string): Promise<GitBranches>;
  checkout(projectId: string, branch: string): Promise<void>;
  log(projectId: string, limit: number): Promise<GitCommit[]>;
  init(projectId: string): Promise<void>;
  /** Returns the full commit DAG for the git-graph layout. */
  graph(projectId: string, limit: number): Promise<GraphCommit[]>;
}

/** Remote (SSH/WSL) connection management (L9). */
export interface RemoteGateway {
  connect(projectId: string): Promise<void>;
}

/** Input for {@link TemplateGateway.createTemplate}. */
export interface CreateTemplateInput {
  name: string;
  content: string;
  defaultProfileId: string;
}

/**
 * Templates (L7): CRUD for agent templates, creation of agents from templates,
 * drift detection and synchronisation.
 */
export interface TemplateGateway {
  /** Lists all templates. */
  listTemplates(): Promise<Template[]>;
  /** Creates a new template; returns the created template. */
  createTemplate(input: CreateTemplateInput): Promise<Template>;
  /** Updates a template's content; increments its version; returns the updated template. */
  updateTemplate(templateId: string, content: string): Promise<Template>;
  /** Deletes a template by id. */
  deleteTemplate(templateId: string): Promise<void>;
  /**
   * Creates an agent in `projectId` based on the given template.
   * The agent's origin will be `fromTemplate`; its context will be the template's `contentMd`.
   */
  createAgentFromTemplate(
    projectId: string,
    templateId: string,
    opts?: { name?: string; synchronized?: boolean },
  ): Promise<Agent>;
  /** Returns the list of synchronized agents in `projectId` whose template has been updated. */
  detectDrift(projectId: string): Promise<AgentDrift[]>;
  /**
   * Syncs a single agent to the current version of its template.
   * Returns `{ synced: true, version }` on success, `{ synced: false, version: null }` for
   * scratch / non-synchronized agents.
   */
  syncAgent(
    projectId: string,
    agentId: string,
  ): Promise<{ synced: boolean; version: number | null }>;
}

/** Input for {@link SkillGateway.createSkill}. */
export interface CreateSkillInput {
  /** Owning project (resolved to a root; ignored on disk for `global`). */
  projectId: string;
  name: string;
  content: string;
  scope: SkillScope;
}

/**
 * Skills (L12): CRUD for reusable, model-agnostic workflows in either scope, and
 * agent↔skill assignment. Assigned skills are injected into the agent's
 * convention file at activation (handled backend-side, ARCHITECTURE §14.2).
 */
export interface SkillGateway {
  /** Lists the skills in one scope for the given project. */
  listSkills(projectId: string, scope: SkillScope): Promise<Skill[]>;
  /** Creates a new skill; returns the created skill. */
  createSkill(input: CreateSkillInput): Promise<Skill>;
  /** Updates a skill's content; returns the updated skill. */
  updateSkill(
    projectId: string,
    scope: SkillScope,
    skillId: string,
    content: string,
  ): Promise<Skill>;
  /** Deletes a skill by id from its scope's store. */
  deleteSkill(
    projectId: string,
    scope: SkillScope,
    skillId: string,
  ): Promise<void>;
  /** Assigns a skill to an agent (idempotent). */
  assignSkill(
    projectId: string,
    agentId: string,
    skillId: string,
    scope: SkillScope,
  ): Promise<void>;
  /** Unassigns a skill from an agent (idempotent). */
  unassignSkill(
    projectId: string,
    agentId: string,
    skillId: string,
  ): Promise<void>;
}

/** Input for {@link MemoryGateway.createMemory}. */
export interface CreateMemoryInput {
  /** Owning project (resolved to its `.ideai/` memory store). */
  projectId: string;
  /** Human title; also the source of the note's slug identity. */
  name: string;
  description: string;
  type: MemoryType;
  content: string;
}

/**
 * Memory (L14): CRUD over project memory notes + the recall-oriented index and
 * `[[wikilink]]` resolution. Identity is the **slug** (kebab-case), not a UUID;
 * a note's slug is immutable, so `updateMemory` never changes it. Mirrors the
 * seven backend memory commands (+ optional `recall`).
 */
export interface MemoryGateway {
  /** Lists every memory note of a project (full payloads). */
  listMemories(projectId: string): Promise<Memory[]>;
  /** Reads a single note by slug. */
  getMemory(projectId: string, slug: string): Promise<Memory>;
  /** Creates a new note; returns the created note. */
  createMemory(input: CreateMemoryInput): Promise<Memory>;
  /** Updates a note's mutable fields (slug is immutable); returns the updated note. */
  updateMemory(
    projectId: string,
    slug: string,
    description: string,
    type: MemoryType,
    content: string,
  ): Promise<Memory>;
  /** Deletes a note by slug. */
  deleteMemory(projectId: string, slug: string): Promise<void>;
  /** Reads the recall-oriented memory index. */
  readIndex(projectId: string): Promise<MemoryIndexEntry[]>;
  /** Resolves a note's `[[wikilinks]]` to the slugs of existing target notes. */
  resolveLinks(projectId: string, slug: string): Promise<MemoryLink[]>;
  /** Best-effort recall: the index entries most relevant to `text`, within a token budget. */
  recall(
    projectId: string,
    text: string,
    tokenBudget: number,
  ): Promise<MemoryIndexEntry[]>;
}

/**
 * Agent input control (ARCHITECTURE §20). The mediated-input strip is gone: the
 * agent cell is a **native terminal** and human keystrokes (Enter included) go
 * straight to the PTY. This port only carries the two out-of-band controls:
 *
 *  - **Interrompre** → `interrupt` (preempt the current turn — a control byte,
 *    not an enqueue).
 *  - **Ack** → `delegationDelivered`: the cell's write-portal confirms it has
 *    effectively written a delegation's text into the native PTY (closes the
 *    "the turn was delivered" loop for observability; the `ask` wake-up still
 *    rides on `idea_reply`).
 *
 * The component talks to this gateway via DI, never to `invoke()` directly.
 */
export interface InputGateway {
  /** Interrompre = preempt: signals the current turn to stop (not an enqueue). */
  interrupt(projectId: string, agentId: string): Promise<void>;
  /**
   * Ack: the cell's write-portal has written the delegation `ticket` into the
   * agent's native PTY (ARCHITECTURE §20.3). Best-effort; never changes the
   * ticket correlation.
   */
  delegationDelivered(
    projectId: string,
    agentId: string,
    ticket: string,
  ): Promise<void>;
  /**
   * Reports whether a **frontend terminal cell** is mounted for `agentId` (`true`
   * when the cell's write-portal binds its PTY handle, `false` on unmount). The
   * backend mediator needs this to deliver a turn to a **headless** agent — one
   * delegated in the background with no cell, where nobody would consume
   * `delegationReady`: it then writes the task into the PTY itself. An agent with a
   * mounted cell keeps the write-portal path. Best-effort; never throws into the UI.
   */
  setFrontAttached(agentId: string, attached: boolean): Promise<void>;
  /**
   * Cancels the **auto-resume** armed for a rate-limited agent (ARCHITECTURE §21):
   * the user clicked "Annuler la reprise" during the cancellable window. Disarms
   * the scheduled wake-up. Resolves to `true` iff a resume was effectively
   * cancelled (a wake-up was still pending); `false` if none was armed or it had
   * already fired (the resume then runs its course). The backend also emits
   * `agentResumeCancelled` on success, which clears the countdown in the UI.
   */
  cancelResume(agentId: string): Promise<boolean>;
  /**
   * Human net (level 3, ARCHITECTURE §21.1): arms a resume at a user-chosen
   * instant for an agent whose limit was *suspected* without a reliable reset
   * time. `resetsAtMs` is the chosen wake-up in epoch-milliseconds; the backend
   * clamps a past instant to "now" (⇒ immediate resume). This arms the same
   * cancellable resume as the automatic path and re-emits `agentResumeScheduled`,
   * so the UI flips on its own from "heure inconnue" to the nominal countdown.
   */
  setResumeAt(agentId: string, resetsAtMs: number): Promise<void>;
}

/**
 * AI profiles & first-run (L5). Drives the first-run wizard and profile
 * management: the pre-filled reference catalogue, detection of installed CLIs,
 * and CRUD/batch persistence of the chosen/edited/custom profiles.
 */
export interface ProfileGateway {
  /** First-run state: whether to show the wizard + the reference catalogue. */
  firstRunState(): Promise<FirstRunState>;
  /** The pre-filled, editable reference catalogue (Claude/Codex/Gemini/Aider). */
  referenceProfiles(): Promise<AgentProfile[]>;
  /** Probes each candidate's detection command; returns availability (✓/✗). */
  detectProfiles(candidates: AgentProfile[]): Promise<ProfileAvailability[]>;
  /** Lists the configured profiles. */
  listProfiles(): Promise<AgentProfile[]>;
  /** Creates or replaces (by id) a single profile; returns the saved profile. */
  saveProfile(profile: AgentProfile): Promise<AgentProfile>;
  /** Deletes a profile by id. */
  deleteProfile(profileId: string): Promise<void>;
  /** Persists the batch of chosen profiles, closing the first run. */
  configureProfiles(profiles: AgentProfile[]): Promise<AgentProfile[]>;
}

/** Input for {@link EmbedderGateway.saveEmbedderProfile}. */
export interface SaveEmbedderProfileInput {
  profile: EmbedderProfile;
}

/**
 * Embedder configuration (L14 / lot C2). Drives the memory/embedder settings
 * panel: lists the configured embedder profiles, the available engines (with
 * build-time feature flags so unavailable strategies can be shown disabled),
 * and persists / removes profiles. Changing the active embedder takes effect at
 * the next app start. Mirrors the four backend embedder commands.
 */
export interface EmbedderGateway {
  /** Lists the configured embedder profiles (transparent: no secrets). */
  listEmbedderProfiles(): Promise<EmbedderProfile[]>;
  /** Creates or replaces (by id) a single profile; returns the saved profile. */
  saveEmbedderProfile(profile: EmbedderProfile): Promise<EmbedderProfile>;
  /** Deletes an embedder profile by id. */
  deleteEmbedderProfile(embedderId: string): Promise<void>;
  /** Describes the available engines + build feature flags + detection. */
  describeEmbedderEngines(): Promise<EmbedderEngines>;
}

/** Project and agent permission management (LP1). */
export interface PermissionGateway {
  /** Reads the full project permission document. */
  getProjectPermissions(projectId: string): Promise<ProjectPermissions>;
  /** Replaces or removes project-level default permissions. */
  updateProjectPermissions(
    projectId: string,
    permissions: PermissionSet | null,
  ): Promise<ProjectPermissions>;
  /** Replaces or removes one agent-specific override. */
  updateAgentPermissions(
    projectId: string,
    agentId: string,
    permissions: PermissionSet | null,
  ): Promise<ProjectPermissions>;
  /** Resolves effective permissions for one agent. */
  resolveAgentPermissions(
    projectId: string,
    agentId: string,
  ): Promise<EffectivePermissions | null>;
}

/** Read-only live work-state read-model for conversations/delegations. */
export interface WorkStateGateway {
  /** Reads the current per-agent live/offline and idle/busy state for a project. */
  getProjectWorkState(projectId: string): Promise<ProjectWorkState>;
  /**
   * Cancels a running/pending background task by id. The read-model refreshes
   * through the `backgroundTaskChanged` domain event.
   */
  cancelBackgroundTask(taskId: string): Promise<void>;
  /**
   * Re-runs a failed/cancelled background task under a **new** task id (the
   * original id is never reused).
   */
  retryBackgroundTask(taskId: string): Promise<void>;
}

/** One paginated page request over a conversation transcript (LS7). */
export interface ConversationPageRequest {
  /** Turn id to paginate around; omit to start from a thread end. */
  anchor?: string;
  /** Travel direction; defaults to `"backward"` (latest page first). */
  direction?: PageDirection;
  /** Requested page size (clamped by the backend to `[1, 200]`). */
  limit?: number;
}

/** Read-only, paginated access to a conversation's full transcript (LS7). */
export interface ConversationGateway {
  /** Reads one page of a conversation's transcript (full text, never truncated). */
  readPage(
    projectId: string,
    conversationId: string,
    request?: ConversationPageRequest,
  ): Promise<TurnPage>;
}

/**
 * Filter/search criteria for {@link TicketGateway.list} (ticket #12).
 *
 * Status and priority are **multi-select**: `statuses`/`priorities` are sets of
 * accepted values with OR semantics *within* a facet and AND *across* facets. An
 * empty or absent array means "no constraint on this facet" (all values pass).
 */
export interface TicketListQuery {
  statuses?: TicketStatus[];
  priorities?: TicketPriority[];
  assignedAgentId?: string;
  /** Free-text match over title/description. */
  text?: string;
  limit?: number;
  cursor?: string;
}

/** Input for {@link TicketGateway.create}. */
export interface CreateTicketInput {
  title: string;
  description?: string;
  priority?: TicketPriority;
  status?: TicketStatus;
  assignedAgentIds?: string[];
}

/**
 * Fields to change on {@link TicketGateway.update}. Only the provided keys are
 * touched; `expectedVersion` is mandatory (optimistic concurrency — a stale
 * value surfaces a `versionConflict` {@link GatewayError}).
 */
export interface UpdateTicketInput {
  title?: string;
  description?: string;
  status?: TicketStatus;
  priority?: TicketPriority;
  assignedAgentIds?: string[];
  expectedVersion: number;
}

/**
 * Ticket gateway (public wire name for the backend `Issue` model). The only
 * frontend place that knows the `ticket_*` command names; features consume this
 * port through DI. Every mutation carries an `expectedVersion` and rejects with
 * a `versionConflict` {@link GatewayError} when the ticket moved underneath.
 */
export interface TicketGateway {
  /** Creates a ticket and returns it. */
  create(projectId: string, input: CreateTicketInput): Promise<Ticket>;
  /** Reads one ticket, optionally including its carnet body. */
  read(
    projectId: string,
    ref: string,
    includeCarnet?: boolean,
  ): Promise<Ticket>;
  /** Lists tickets matching the (optional) filter/search query. */
  list(projectId: string, query?: TicketListQuery): Promise<TicketList>;
  /** Applies partial edits (title/description/status/priority/assignees). */
  update(
    projectId: string,
    ref: string,
    input: UpdateTicketInput,
  ): Promise<Ticket>;
  /**
   * Deletes a ticket (ticket #6). Rejects with a `notFound` {@link GatewayError}
   * when the ref does not exist. On success the backend emits an `issueDeleted`
   * domain event (payload `{ projectId, issueRef, freedSprint }`) — the single
   * source of truth that drives the ticket's removal from lists and the closing
   * of an open detail view. Callers must not mutate local state imperatively.
   */
  delete(projectId: string, ref: string): Promise<void>;
  /** Reads the ticket-scoped Markdown carnet. */
  readCarnet(projectId: string, ref: string): Promise<TicketCarnet>;
  /** Replaces (not appends) the ticket-scoped carnet body. */
  updateCarnet(
    projectId: string,
    ref: string,
    carnet: string,
    expectedVersion: number,
  ): Promise<Ticket>;
  /** Links this ticket to another `#id` with the given relationship kind. */
  link(
    projectId: string,
    ref: string,
    targetRef: string,
    kind: TicketLinkKind,
    expectedVersion: number,
  ): Promise<Ticket>;
  /** Removes a link (optionally scoped to a single kind). */
  unlink(
    projectId: string,
    ref: string,
    targetRef: string,
    expectedVersion: number,
    kind?: TicketLinkKind,
  ): Promise<Ticket>;
  /** Assigns/unassigns an agent to the ticket. */
  assign(
    projectId: string,
    ref: string,
    agentId: string,
    assigned: boolean,
    expectedVersion: number,
  ): Promise<Ticket>;
  /** Lists the project's sprints, ordered by `order` (ticket #10). */
  listSprints(projectId: string): Promise<Sprint[]>;
  /**
   * Sets (or clears with `sprintId === null`) a ticket's sprint membership
   * (ticket #10). Optimistic concurrency: `expectedVersion` must match.
   */
  setTicketSprint(
    projectId: string,
    ref: string,
    sprintId: string | null,
    expectedVersion: number,
  ): Promise<Ticket>;
  /** Creates a sprint (name required by the backend) and returns it (#11). */
  createSprint(projectId: string, name: string): Promise<Sprint>;
  /**
   * Renames a sprint. Optimistic concurrency: `expectedVersion` must match the
   * sprint's current version (#11).
   */
  renameSprint(
    projectId: string,
    sprintId: string,
    name: string,
    expectedVersion: number,
  ): Promise<Sprint>;
  /**
   * Reorders sprints to the given full list of ids (execution order). Returns
   * the reordered sprint list (#11).
   */
  reorderSprints(projectId: string, orderedIds: string[]): Promise<Sprint[]>;
  /**
   * Deletes a sprint. The backend unassigns its tickets (it does NOT delete
   * them); they fall back to the "no sprint" bucket (#11).
   */
  deleteSprint(projectId: string, sprintId: string): Promise<void>;
  /**
   * Opens an AI assistant chat bound to a ticket (ticket #8). Spawns a
   * structured assistant session driven by `profileId`; returns the live
   * session handle. One session per ticket — reopening supersedes.
   */
  openTicketChat(
    projectId: string,
    issueRef: string,
    profileId: string,
  ): Promise<TicketChat>;
  /** Closes (disposes) a ticket's assistant chat session (ticket #8). */
  closeTicketChat(projectId: string, issueRef: string): Promise<void>;
  /**
   * Sends a message on an open assistant session and streams the reply back as
   * {@link ReplyChunk}s via `onChunk` (ticket #8). Resolves once the turn has
   * started; the turn ends at the `final` chunk. Reuses the shared `agent_send`
   * chat transport (the same as the structured chat cell).
   */
  sendTicketChat(
    sessionId: string,
    message: string,
    onChunk: (chunk: ReplyChunk) => void,
  ): Promise<void>;
}

/**
 * The full set of gateways the app depends on, injected via the DI provider.
 * The composition (real vs mock) is chosen in `app/`.
 */
export interface Gateways {
  system: SystemGateway;
  agent: AgentGateway;
  input: InputGateway;
  terminal: TerminalGateway;
  project: ProjectGateway;
  layout: LayoutGateway;
  git: GitGateway;
  remote: RemoteGateway;
  profile: ProfileGateway;
  template: TemplateGateway;
  skill: SkillGateway;
  memory: MemoryGateway;
  embedder: EmbedderGateway;
  permission: PermissionGateway;
  workState: WorkStateGateway;
  conversation: ConversationGateway;
  ticket: TicketGateway;
}