/**
 * Backend interface — AI model abstraction.
 *
 * Two flavors:
 * - SessionBackend: delivers via typeIntoSession (iTerm2 CLI sessions)
 * - APIBackend: delivers via direct HTTP API calls (future)
 */
export interface Backend {
    readonly name: string;
    readonly type: "session" | "api";
    deliver(message: string, sessionId?: string): Promise<string | undefined>;
    health?(): Promise<BackendHealth>;
    listSessions?(): BackendSession[];
    createSession?(name: string, cwd?: string): BackendSession;
    removeSession?(sessionId: string): Promise<void>;
    sessionStatus?(sessionId: string): BackendSessionStatus | undefined;
}
export interface BackendHealth {
    status: "ok" | "degraded" | "down";
    activeSessions: number;
    detail?: string;
}
export interface BackendSession {
    id: string;
    name: string;
    cwd?: string;
    /** Timestamp when the session was created (milliseconds since epoch) */
    createdAt?: number;
}
export type BackendSessionStatus = "idle" | "busy" | "error" | "terminated";
export interface SessionBackendConfig {
    type: "session";
    command: string;
}
export interface APIBackendConfig {
    type: "api";
    provider: "anthropic" | "openai" | "ollama";
    model: string;
    baseUrl?: string;
    apiKey?: string;
    /** System prompt for the Claude subprocess */
    systemPrompt?: string;
    /** Working directory for the subprocess (default: $HOME) */
    cwd?: string;
    /** Max conversation turns per message (default: 30) */
    maxTurns?: number;
    /** Max USD spend per deliver() call (default: 1.00) */
    maxBudgetUsd?: number;
    /** Permission mode: "default" | "acceptEdits" | "bypassPermissions" | "plan" | "dontAsk" */
    permissionMode?: string;
    /** Whitelist of allowed tools */
    allowedTools?: string[];
    /** Skip auto-creating the initial "Default" session (for HybridSessionManager) */
    skipDefaultSession?: boolean;
}
export interface OllamaBackendConfig {
    type: "ollama";
    model: string;
    baseUrl?: string;
}
export interface CustomBackendConfig {
    type: "custom";
    modulePath: string;
    options: Record<string, unknown>;
}
export type BackendConfig = SessionBackendConfig | APIBackendConfig | OllamaBackendConfig | CustomBackendConfig;
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