import type { ISessionClient } from "../platform/ports/session-client.ts";
import type { NotificationMessage, NotificationEventType, NotificationEventConfig, NotificationTemplateVars } from "./types.ts";
/**
 * Simple `{var_name}` template replacement.
 *
 * Replaces all `{identifier}` placeholders with their corresponding value
 * from `vars`. Unknown variables remain as-is in the output.
 *
 * @param template - Template string containing `{var_name}` placeholders.
 * @param vars - Flat key-value map of template variables.
 * @returns The rendered string with variables substituted.
 */
export declare function renderTemplate(template: string, vars: NotificationTemplateVars): string;
/**
 * Build a flat `NotificationTemplateVars` record from session and event params.
 *
 * Every key is guaranteed to exist (empty string for missing optional fields).
 * `timestamp` is set to the current time at call time.
 */
export declare function buildTemplateVars(params: {
    sessionId: string;
    eventType: NotificationEventType;
    agent?: string;
    roleName?: string;
    sessionTitle?: string;
    lastUserMessage?: string;
    lastAssistantMessage?: string;
}): NotificationTemplateVars;
/**
 * Extract text from message parts where `type === "text"`.
 * Trims each text segment, filters out empty strings, and joins with `\n`.
 */
export declare function extractMessageText(parts: Array<{
    type: string;
    text?: string;
}>): string;
/**
 * Collapse multi-line whitespace into a single line.
 * Splits by newlines, trims each line, filters empties, and joins with a single space.
 */
export declare function collapseWhitespace(text: string): string;
/**
 * Get the last non-empty line from a multi-line string.
 * Splits by newlines, trims each line, filters empties, and returns the last
 * element, or `""` if there are no non-empty lines.
 */
export declare function getLastNonEmptyLine(text: string): string;
/**
 * Read session title and last user/assistant messages from the opencode SDK.
 *
 * API calls are wrapped in try/catch — failures return an empty object
 * (never throws).
 *
 * The optional `dir` parameter controls which project workspace is queried.
 *
 * @param client - The opencode plugin client for SDK API calls.
 * @param sessionID - The session ID to read.
 * @param dir - Optional workspace directory (defaults to `process.cwd()`).
 * @returns Session title, last user message text, and last assistant message text.
 */
export declare function readSessionInfo(client: ISessionClient, sessionID: string, dir?: string): Promise<{
    title?: string;
    lastUserMessage?: string;
    lastAssistantMessage?: string;
}>;
/**
 * Build a fully populated `NotificationMessage` by reading session info
 * and rendering event-appropriate templates.
 *
 * Default templates:
 * - Title: `"Rolebox · {event_type}"`
 * - Body: `"{session_title}"`
 *
 * Title is truncated to 256 characters, body to 4000 characters.
 * On any error, returns a minimal `NotificationMessage` with the raw fields.
 *
 * @param params - Parameters including session ID, event type, optional
 *                 event config, client, agent, role name, directory, and
 *                 any extra template variables (e.g. graph_id / node_id for
 *                 structured events) merged over the base vars before rendering.
 * @returns A fully populated `NotificationMessage`.
 */
export declare function buildNotificationContent(params: {
    sessionID: string;
    eventType: NotificationEventType;
    eventConfig?: NotificationEventConfig;
    client: ISessionClient;
    agent?: string;
    roleName?: string;
    dir?: string;
    extraVars?: NotificationTemplateVars;
}): Promise<NotificationMessage>;
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