/**
 * POST /ds-agent/commands/{command_id}/fail — 指示の失敗の報告（指示書AY 段階7-3。D14・D25 ①②・D-179）
 *
 * 仕様の正は `d-watch-api.yaml` の同パス。送信中の失敗も export の指示の id へ。zip が無いときは `export_not_found`。
 * ★`message` はログにも画面にも出さない★。★形の誤りは 400 `result_invalid`。状態は変えない★（R43・R44）。
 */
import { NextResponse } from "next/server";
import { agentCommandPreamble, commandNotFound, jsonError, noContent } from "@/lib/ds-agent/agent-request";
import { getRelay } from "@/lib/ds-agent/relay";
import { ensureDsAgentLogging } from "@/lib/ds-agent/relay-log";
import { parseAgentFail } from "@/lib/ds-logs/validate";
import { withRequestId } from "@/lib/logger";

export async function POST(request: Request, { params }: { params: Promise<{ command_id: string }> }) {
  return withRequestId(request, async () => {
    ensureDsAgentLogging();
    const pre = await agentCommandPreamble(request, (await params).command_id);
    if (!pre.ok) return pre.response;

    const parsed = parseAgentFail(await request.text());
    if (!parsed.ok) return NextResponse.json(parsed.error, { status: parsed.status });

    switch (getRelay().failCommand(pre.serial, pre.commandId, parsed.query.code, parsed.query.message)) {
      case "ok":
        return noContent();
      case "gone":
        return jsonError(410, "export_cancelled", "エクスポートは取り消されました");
      case "not_found":
        return commandNotFound();
    }
  });
}