import { NextResponse } from "next/server";
import { prisma } from "@/lib/db";
import { authErrorResponse } from "@/lib/auth/api";
import { requireSessionUser } from "@/lib/auth/session";
import { requireActiveThreadsAuth } from "@/lib/services/threads-auth-guard";
import { replyViaThreadsApi } from "@/lib/threads-api";
import { getActiveThreadsCredentials } from "@/lib/services/threads-credentials";

export async function POST(
  _request: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    await requireSessionUser();
    const authCheck = await requireActiveThreadsAuth();
    if (!authCheck.ok) {
      return NextResponse.json({ error: authCheck.error }, { status: 401 });
    }

    const { id } = await params;
    const draft = await prisma.replyDraft.findUnique({
      where: { id },
      include: { inboundReply: true },
    });
    if (!draft) return NextResponse.json({ error: "找不到回覆草稿" }, { status: 404 });
    if (!draft.inboundReply.externalId) {
      return NextResponse.json({ error: "此留言缺少 Threads reply id，無法 API 回覆" }, { status: 400 });
    }

    const credentials = await getActiveThreadsCredentials();
    if (!credentials) return NextResponse.json({ error: "Threads API 尚未連線" }, { status: 401 });

    const result = await replyViaThreadsApi(credentials, {
      replyToId: draft.inboundReply.externalId,
      text: draft.text,
    });
    if (!result.success) {
      return NextResponse.json({ error: result.error ?? "發布回覆失敗" }, { status: 500 });
    }

    await prisma.$transaction([
      prisma.replyDraft.update({
        where: { id },
        data: { status: "PUBLISHED", publishedAt: new Date() },
      }),
      prisma.inboundReply.update({
        where: { id: draft.inboundReplyId },
        data: { status: "REPLIED" },
      }),
    ]);

    return NextResponse.json({ success: true, result });
  } catch (error) {
    const authRes = authErrorResponse(error);
    if (authRes) return authRes;
    const message = error instanceof Error ? error.message : "發布回覆失敗";
    return NextResponse.json({ error: message }, { status: 500 });
  }
}