import { NextRequest } from 'next/server';
import { db } from '@/lib/db';
import { getAuthUser } from '@/lib/auth';
import { apiHandler, errorResponse, successResponse, paginatedResponse, getPagination, getSorting, getFilters } from '@/lib/api-utils';

/** GET /api/posts - List posts with pagination, filtering, sorting */
export const GET = apiHandler(async (request: NextRequest) => {
  const authUser = await getAuthUser(request);
  if (!authUser) return errorResponse('Authentication required', 401);

  const { page, limit, skip } = getPagination(request);
  const orderBy = getSorting(request);
  const filters = getFilters(request, ['status', 'approvalStatus', 'campaignId']);

  const where: Record<string, unknown> = { userId: authUser.userId };
  if (filters.status) where.status = filters.status;
  if (filters.approvalStatus) where.approvalStatus = filters.approvalStatus;
  if (filters.campaignId) where.campaignId = filters.campaignId;

  const [posts, total] = await Promise.all([
    db.post.findMany({ where, skip, take: limit, orderBy, include: { postAccounts: { include: { account: true } }, postMedia: { include: { media: true } }, campaign: { select: { id: true, name: true } } } }),
    db.post.count({ where }),
  ]);

  return paginatedResponse(posts, page, limit, total);
});

/** POST /api/posts - Create new post */
export const POST = apiHandler(async (request: NextRequest) => {
  const authUser = await getAuthUser(request);
  if (!authUser) return errorResponse('Authentication required', 401);

  const body = await request.json();
  const { title, campaignId, captionDefault, hashtags, scheduledAt, timezone, accountIds, mediaIds } = body;

  const post = await db.post.create({
    data: {
      userId: authUser.userId,
      title: title || 'Untitled Post',
      campaignId: campaignId || null,
      captionDefault,
      hashtags: hashtags ? JSON.stringify(hashtags) : null,
      scheduledAt: scheduledAt ? new Date(scheduledAt) : null,
      timezone: timezone || 'UTC',
      status: scheduledAt ? 'SCHEDULED' : 'DRAFT',
      postAccounts: accountIds?.length ? { create: accountIds.map((accountId: string) => ({ accountId })) } : undefined,
      postMedia: mediaIds?.length ? { create: mediaIds.map((mediaId: string, index: number) => ({ mediaId, position: index })) } : undefined,
    },
    include: { postAccounts: { include: { account: true } }, postMedia: { include: { media: true } } },
  });

  await db.auditLog.create({ data: { userId: authUser.userId, action: 'POST_CREATED', resource: 'Post', resourceId: post.id } });
  return successResponse(post, 201);
});