import { NextRequest } from "next/server";
import { LiveChatStatus, SupportMessageSender } from "@prisma/client";
import { z } from "zod";
import { prisma } from "@/server/db";
import { AppError } from "@/server/errors";
import { fail, ok, parseJson } from "@/server/http";
import { requireUser } from "@/server/security/auth";
import { liveChatConversationInclude } from "@/server/support/includes";
import { serializeLiveChatConversation } from "@/server/support/serializers";

const messageSchema = z.object({
  message: z.string().trim().min(1).max(1200)
});

export const dynamic = "force-dynamic";

export async function POST(request: NextRequest, { params }: { params: Promise<{ id: string }> }) {
  try {
    const { user } = await requireUser(request);
    const { id } = await params;
    const input = await parseJson(request, messageSchema);
    const conversation = await prisma.liveChatConversation.findUniqueOrThrow({ where: { id } });
    if (conversation.userId !== user.id) {
      throw new AppError("Discussion introuvable.", 404, "LIVECHAT_NOT_FOUND");
    }
    if (conversation.status !== LiveChatStatus.OPEN) {
      throw new AppError("Cette discussion est fermée.", 409, "LIVECHAT_CLOSED");
    }

    const updatedConversation = await prisma.liveChatConversation.update({
      where: { id },
      data: {
        lastMessageAt: new Date(),
        messages: {
          create: {
            senderUserId: user.id,
            senderRole: SupportMessageSender.USER,
            body: input.message
          }
        }
      },
      include: liveChatConversationInclude()
    });

    return ok({ conversation: serializeLiveChatConversation(updatedConversation) });
  } catch (error) {
    return fail(error);
  }
}