import type { ExtensionContext } from "@earendil-works/pi-coding-agent";

export const PREFLIGHT_PROTOCOL = "@howaboua/pi-codex-conversion/code-mode-preflight/v1";
export const PREFLIGHT_REQUEST_CHANNEL = `${PREFLIGHT_PROTOCOL}/request`;
export const PREFLIGHT_AVAILABLE_CHANNEL = `${PREFLIGHT_PROTOCOL}/available`;

export interface CodeModeToolPreflightCall {
	toolName: string;
	input: unknown;
	toolCallId: string;
	cwd: string;
	extensionContext: ExtensionContext;
	signal: AbortSignal;
}

export type CodeModeToolPreflightResult =
	| { block: true; reason: string }
	| { block?: false };

export type CodeModeToolPreflight = (
	call: CodeModeToolPreflightCall,
) =>
	| CodeModeToolPreflightResult
	| void
	| Promise<CodeModeToolPreflightResult | void>;

export interface PreflightBroker {
	protocol: typeof PREFLIGHT_PROTOCOL;
	isActive(): boolean;
	register(preflight: CodeModeToolPreflight): () => void;
}

export function isProtocolRequest(value: unknown): boolean {
	return Boolean(
		value &&
			typeof value === "object" &&
			"protocol" in value &&
			value.protocol === PREFLIGHT_PROTOCOL,
	);
}

export function isPreflightBroker(value: unknown): value is PreflightBroker {
	return Boolean(
		value &&
			typeof value === "object" &&
			"protocol" in value &&
			value.protocol === PREFLIGHT_PROTOCOL &&
			"isActive" in value &&
			typeof value.isActive === "function" &&
			"register" in value &&
			typeof value.register === "function",
	);
}