/** Metadata for files attached to ACP prompts or projected by bounded ACP media compatibility. */
export interface AttachedFileMeta {
  fileName: string;
  mimeType: string;
  fileSize: number;
  preview: string | null;
  previewStatus?: 'unavailable';
  filePath?: string;
  source?: 'user-upload' | 'tool-result' | 'message-ref' | 'gateway-media';
  /**
   * For Gateway-injected outgoing media (assistant-media). The Gateway emits
   * an `image` content block with a relative URL like
   * `/api/chat/media/outgoing/<sessionKey>/<attachmentId>/full`. The renderer
   * cannot reach Gateway HTTP directly (CORS / env drift), so this URL is
   * resolved through the Main-process proxy in `media:getThumbnails`, which
   * looks up `~/.openclaw/media/outgoing/records/<attachmentId>.json` and
   * loads the original file off disk.
   */
  gatewayUrl?: string;
}

/** Structured OpenClaw transcript message used by bounded ACP supplements. */
export interface RawMessage {
  role: 'user' | 'assistant' | 'system' | 'toolresult';
  content: unknown; // string | ContentBlock[]
  timestamp?: number;
  id?: string;
  toolCallId?: string;
  toolName?: string;
  details?: unknown;
  isError?: boolean;
  stopReason?: string;
  stop_reason?: string;
  errorMessage?: string;
  error_message?: string;
  /** Canonical OpenClaw-owned transcript metadata. */
  __openclaw?: {
    media?: Array<{
      path?: string;
      url?: string;
      contentType?: string;
      kind?: string;
      fileName?: string;
      sizeBytes?: number;
      messageId?: string;
      workspaceDir?: string;
    }>;
  };
  /** Renderer metadata for user-selected files included in an ACP prompt. */
  _attachedFiles?: AttachedFileMeta[];
}

/** Content block inside a message */
export interface ContentBlock {
  type: 'text' | 'image' | 'thinking' | 'tool_use' | 'tool_result' | 'toolCall' | 'toolResult';
  text?: string;
  thinking?: string;
  source?: { type: string; media_type?: string; data?: string; url?: string };
  /** Flat image format from Gateway tool results (no source wrapper) */
  data?: string;
  mimeType?: string;
  /**
   * Flat URL on an `image` block. Gateway-injected assistant-media messages
   * use this shape: `{ type:'image', url:'/api/chat/media/outgoing/...', mimeType, width, height, alt, openUrl }`.
   * Neither nested `source.url` nor flat `data` is set in that case; the
   * renderer must read `block.url` directly to surface the artifact.
   */
  url?: string;
  /** Optional companion of `url` — points at a higher-resolution variant. */
  openUrl?: string;
  /** Pixel width of the original image, used for layout hints. */
  width?: number;
  /** Pixel height of the original image, used for layout hints. */
  height?: number;
  /** Human-readable filename / alt text emitted by the Gateway. */
  alt?: string;
  id?: string;
  name?: string;
  input?: unknown;
  arguments?: unknown;
  content?: unknown;
}

/** Session from sessions.list */
export interface ChatSession {
  key: string;
  /** OpenClaw transcript session UUID, used to identify synthetic fallback titles. */
  sessionId?: string;
  label?: string;
  displayName?: string;
  derivedTitle?: string;
  lastMessagePreview?: string;
  thinkingLevel?: string;
  model?: string;
  updatedAt?: number;
  status?: string;
  hasActiveRun?: boolean;
  /** Channel provider that last delivered to this session (e.g. webchat, feishu, discord). */
  channel?: string;
  /** OpenClaw ACP session cwd, mirrored for display and routing. OpenClaw is the source of truth. */
  workspacePath?: string;
  /** Renderer-local placeholder created by New Chat before ACP has created the backing session. */
  createdLocally?: boolean;
}

export type GatewaySessionsChangedPayload = Record<string, unknown> & {
  sessionKey?: string;
  key?: string;
  reason?: string;
  phase?: string;
  ts?: number;
  session?: Record<string, unknown>;
  status?: string;
  hasActiveRun?: boolean;
  updatedAt?: number | null;
};

export type LoadSessionsOptions = {
  force?: boolean;
  gatewayGeneration?: number;
};

export interface DeleteSessionsResult {
  deletedKeys: string[];
  failedKeys: string[];
}

export type DeleteSessionResult =
  | { success: true }
  | { success: false; error: string };

export interface ChatState {
  sessions: ChatSession[];
  currentSessionKey: string;
  currentAgentId: string;
  /** First user message text per session key, used as display label */
  sessionLabels: Record<string, string>;
  /** Last message timestamp (ms) per session key, used for sorting */
  sessionLastActivity: Record<string, number>;

  loadSessions: (options?: LoadSessionsOptions) => Promise<void>;
  handleSessionsChanged: (payload: GatewaySessionsChangedPayload) => void;
  switchSession: (key: string) => void;
  selectAcpSession: (key: string, workspacePath?: string) => void;
  newSession: () => void;
  acknowledgeAcpSessionCreated: (key: string, workspacePath?: string, initialPrompt?: string) => void;
  deleteSession: (key: string) => Promise<DeleteSessionResult>;
  deleteSessions: (keys: string[]) => Promise<DeleteSessionsResult>;
  renameSession: (key: string, label: string) => Promise<void>;
}

export const DEFAULT_CANONICAL_PREFIX = 'agent:main';
export const DEFAULT_SESSION_KEY = `${DEFAULT_CANONICAL_PREFIX}:main`;