import type { Context, Model, ProviderSessionState, ServiceTier, StreamFunction, StreamOptions, Tool, ToolChoice } from "../types";
import { type CodexReasoningContext, type RequestBody } from "./openai-codex/request-transformer";
import type { ResponseInput } from "./openai-responses-wire";
export interface OpenAICodexResponsesOptions extends StreamOptions {
    reasoning?: "none" | "minimal" | "low" | "medium" | "high" | "xhigh";
    reasoningSummary?: "auto" | "concise" | "detailed" | null;
    /** `reasoning.context` replay scope; defaults to `all_turns` when unset. The `all_turns` value is gated to gpt-5.4+ Codex models — older ids reject it, so it is suppressed and `context` omitted. */
    reasoningContext?: CodexReasoningContext;
    textVerbosity?: "low" | "medium" | "high";
    include?: string[];
    codexMode?: boolean;
    toolChoice?: ToolChoice;
    preferWebsockets?: boolean;
    serviceTier?: ServiceTier;
    /**
     * Opt into the Responses Lite transport contract. Sends
     * `x-openai-internal-codex-responses-lite: true` on HTTP requests and on the
     * WebSocket upgrade (the marker is connection-scoped there, so lite and
     * non-lite turns never share a pooled socket), strips image detail from
     * input, and disables parallel tool calling — mirroring codex-rs.
     */
    responsesLite?: boolean;
    /**
     * Extra `client_metadata` to include in the request body on both transports.
     * The canonical Codex envelope is `client_metadata["x-codex-turn-metadata"]`
     * (JSON string of thread/turn identifiers); flat keys are also accepted.
     */
    clientMetadata?: Record<string, string>;
    /**
     * Invoked when the server streams a `response.metadata` event carrying
     * ChatGPT moderation metadata (`metadata.openai_chatgpt_moderation_metadata`)
     * for first-party presentation parity. Diagnostic observer: failures are
     * swallowed and must not alter the stream.
     */
    onModerationMetadata?: (metadata: unknown) => void;
}
type CodexTransport = "sse" | "websocket";
/**
 * Per-session request-shape counters. Despite the name, these cover both
 * transports: once stateful SSE chaining is enabled, SSE requests are counted
 * too (the shared chained-request builder records every request it shapes).
 */
export interface OpenAICodexWebSocketDebugStats {
    fullContextRequests: number;
    deltaRequests: number;
    lastInputItems: number;
    lastDeltaInputItems?: number;
    lastPreviousResponseId?: string;
}
/** @internal Exported for tests. */
export declare function normalizeCodexToolChoice(choice: ToolChoice | undefined, tools?: Tool[], model?: Model<"openai-codex-responses">): string | Record<string, unknown> | undefined;
/** @internal Exported for tests. */
export declare function buildTransformedCodexRequestBody(model: Model<"openai-codex-responses">, context: Context, options: OpenAICodexResponsesOptions | undefined, promptCacheKey?: string | undefined): Promise<RequestBody>;
export declare const streamOpenAICodexResponses: StreamFunction<"openai-codex-responses">;
export declare function prewarmOpenAICodexResponses(model: Model<"openai-codex-responses">, options?: Pick<OpenAICodexResponsesOptions, "apiKey" | "headers" | "sessionId" | "signal" | "preferWebsockets" | "providerSessionState" | "responsesLite">): Promise<void>;
export interface OpenAICodexTransportDetails {
    websocketPreferred: boolean;
    lastTransport?: CodexTransport;
    websocketDisabled: boolean;
    websocketConnected: boolean;
    fallbackCount: number;
    canAppend: boolean;
    prewarmed: boolean;
    hasSessionState: boolean;
    lastFallbackAt?: number;
}
export declare function getOpenAICodexWebSocketDebugStats(model: Model<"openai-codex-responses">, options?: {
    sessionId?: string;
    baseUrl?: string;
    providerSessionState?: Map<string, ProviderSessionState>;
}): OpenAICodexWebSocketDebugStats | undefined;
export declare function getOpenAICodexTransportDetails(model: Model<"openai-codex-responses">, options?: {
    sessionId?: string;
    baseUrl?: string;
    preferWebsockets?: boolean;
    providerSessionState?: Map<string, ProviderSessionState>;
}): OpenAICodexTransportDetails;
declare function convertMessages(model: Model<"openai-codex-responses">, context: Context): ResponseInput;
/** @internal Exported for tests. */
export { convertMessages as convertCodexResponsesMessages };
type CodexToolPayload = {
    type: "function";
    name: string;
    description: string;
    parameters: Record<string, unknown>;
    strict?: boolean;
} | {
    type: "custom";
    name: string;
    description: string;
    format: {
        type: "grammar";
        syntax: "lark" | "regex";
        definition: string;
    };
};
/** @internal Exported for tests. */
export declare function convertOpenAICodexResponsesTools(tools: Tool[], model: Model<"openai-codex-responses">): CodexToolPayload[];
export declare class CodexWebSocketTransportError extends Error {
    constructor(detail: string);
}
declare class CodexProviderStreamError extends Error {
    readonly retryable: boolean;
    readonly code?: string;
    constructor(message: string, retryable: boolean, code?: string);
}
export declare function isRetryableCodexFailureEvent(rawEvent: Record<string, unknown>): boolean;
export declare function createCodexProviderStreamError(rawEvent: Record<string, unknown>): CodexProviderStreamError;