import { s } from '../schema';
import { JsonValue, Prettify } from '../utils';
/**
 * @public
 */
export type Middleware = (fetchInit: RequestInit) => RequestInit | Promise<RequestInit>;
/**
 * @public
 */
export type Tool<Name, Args, Result> = {
    name: Name;
    description: string;
    schema: s.SchemaInput;
    handler: (input: Args, abortSignal: AbortSignal) => Promise<Result>;
};
/**
 * @public
 */
export type AnyTool = Tool<string, any, any>;
/**
 * @public
 */
export type UserMessage = {
    role: 'user';
    content: JsonValue;
};
/**
 * @public
 */
export type ToolCall<ToolUnion extends AnyTool> = Prettify<ToolUnion extends Tool<infer Name, infer Args, infer Result> ? {
    role: 'tool';
    status: 'done';
    name: Name;
    args: Args;
    result: PromiseSettledResult<Result>;
    toolCallId: string;
} | {
    role: 'tool';
    status: 'pending';
    name: Name;
    args: Args;
    toolCallId: string;
    progress?: number;
} : never>;
/**
 * @public
 */
export type AnyToolCall = ToolCall<AnyTool>;
/**
 * @public
 */
export interface AssistantMessage<Output, ToolUnion extends AnyTool> {
    role: 'assistant';
    content?: Output;
    toolCalls: ToolCall<ToolUnion>[];
}
/**
 * @public
 */
export type ErrorMessage = {
    role: 'error';
    content: string;
};
/**
 * @public
 */
export type Message<Output, Tools extends AnyTool> = UserMessage | AssistantMessage<Output, Tools> | ErrorMessage;
/**
 * @public
 */
export type AnyMessage = Message<string | object, AnyTool>;
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