import type { GoalConfig } from "./types.ts";

export const DEFAULT_CONFIG: GoalConfig = {
  enabled: true,
  skepticN: 3,
  verifyMax: 10,
  stallThreshold: 2,
  strategistEvery: 5, // max(1, 10/2)
  plannerRequired: true,
  preverify: true,
  receipts: true,
  subagentsTimeoutMs: 600_000,
  /** Planner research can exceed panel waits (B029). */
  plannerTimeoutMs: 1_800_000,
};

function clampInt(value: number, min: number, max?: number): number {
  let n = Math.trunc(value);
  if (!Number.isFinite(n)) n = min;
  if (n < min) n = min;
  if (max !== undefined && n > max) n = max;
  return n;
}

/**
 * Merge a partial config over defaults with clamping:
 * - skepticN: 1–5
 * - verifyMax: ≥ 1
 * - stallThreshold: ≥ 1
 * - strategistEvery: ≥ 1 (default max(1, verifyMax/2) when omitted)
 * - subagentsTimeoutMs: ≥ 1
 * - plannerTimeoutMs: ≥ 1
 */
export function resolveConfig(partial?: Partial<GoalConfig>): GoalConfig {
  const base = { ...DEFAULT_CONFIG, ...(partial ?? {}) };

  const verifyMax = clampInt(base.verifyMax, 1);
  const skepticN = clampInt(base.skepticN, 1, 5);
  const stallThreshold = clampInt(base.stallThreshold, 1);
  const subagentsTimeoutMs = clampInt(base.subagentsTimeoutMs, 1);
  const plannerTimeoutMs = clampInt(base.plannerTimeoutMs, 1);

  // If caller omitted strategistEvery, derive from resolved verifyMax.
  const strategistEvery =
    partial?.strategistEvery === undefined
      ? Math.max(1, Math.floor(verifyMax / 2))
      : clampInt(base.strategistEvery, 1);

  return {
    enabled: Boolean(base.enabled),
    skepticN,
    verifyMax,
    stallThreshold,
    strategistEvery,
    plannerRequired: Boolean(base.plannerRequired),
    preverify: Boolean(base.preverify),
    receipts: Boolean(base.receipts),
    subagentsTimeoutMs,
    plannerTimeoutMs,
  };
}