export interface ContinuationInput {
  objective: string;
  planPath: string;
  gaps: string[];
  nextStep: string | null;
  strategyNote?: string;
  verifyRound?: number;
}

/**
 * Build a follow-up directive the harness injects after a NotAchieved verify.
 */
export function buildContinuationDirective(input: ContinuationInput): string {
  const lines: string[] = [
    "# Goal continuation",
    "",
    `Continue pursuing the goal. Do not claim completion until the harness verifies.`,
    "",
    `**Objective:** ${input.objective.trim()}`,
    `**Plan:** \`${input.planPath}\``,
  ];

  if (input.verifyRound !== undefined) {
    lines.push(`**Verify round:** ${input.verifyRound}`);
  }

  lines.push("");
  lines.push("## Unmet gaps");
  if (input.gaps.length === 0) {
    lines.push("- (no specific gaps recorded — re-check acceptance criteria and evidence)");
  } else {
    for (const g of input.gaps) {
      lines.push(`- ${g}`);
    }
  }

  lines.push("");
  lines.push("## Next step");
  if (input.nextStep) {
    lines.push(`Focus on: ${input.nextStep}`);
  } else {
    lines.push(
      "No unchecked task-checklist item found — pick the highest-impact remaining criterion.",
    );
  }

  if (input.strategyNote?.trim()) {
    lines.push("");
    lines.push("## Strategy note");
    lines.push(input.strategyNote.trim());
  }

  lines.push("");
  lines.push("## Standing orders");
  lines.push("- Work from the frozen plan contract (acceptance criteria + verification plan).");
  lines.push("- Update the evidence index when you produce proof artifacts.");
  lines.push("- Call `update_goal(message)` for progress at milestones (`researched` / `implementing` / `pre-complete`); `update_goal(completed: true)` only when done.");
  lines.push("- Do not weaken plan.baseline.md acceptance criteria.");
  lines.push("");

  return lines.join("\n");
}