/**
 * Server-side agent data fetching for Next.js Server Components.
 *
 * Uses `fetch` directly (no browser-only helpers) so it can run
 * inside `generateMetadata`, server pages, etc.
 */

import type { AgentPublicProfile, AgentReviewStats, PaginatedReviews } from './agents-api';
import type { ListingDetail, PaginatedResult } from './listings-api';

const API_BASE_URL = process.env['NEXT_PUBLIC_API_URL'] || 'http://localhost:3001/api/v1';

/**
 * Fetch a public agent profile by ID — server-only.
 * Returns `null` when the agent is not found (404) so callers can `notFound()`.
 */
export async function fetchAgentProfile(agentId: string): Promise<AgentPublicProfile | null> {
  try {
    const res = await fetch(`${API_BASE_URL}/agents/${agentId}/profile`, {
      next: { revalidate: 300 }, // ISR: re-validate every 5 min
    });

    if (!res.ok) return null;
    return (await res.json()) as AgentPublicProfile;
  } catch {
    return null;
  }
}

/**
 * Fetch reviews for an agent — server-only.
 */
export async function fetchAgentReviews(
  agentId: string,
  page = 1,
  limit = 10,
): Promise<PaginatedReviews> {
  try {
    const res = await fetch(
      `${API_BASE_URL}/reviews?targetType=AGENT&targetId=${agentId}&page=${page}&limit=${limit}`,
      { next: { revalidate: 300 } },
    );

    if (!res.ok) {
      return { data: [], total: 0, page: 1, limit: 10, totalPages: 0 };
    }
    return (await res.json()) as PaginatedReviews;
  } catch {
    return { data: [], total: 0, page: 1, limit: 10, totalPages: 0 };
  }
}

/**
 * Fetch review stats for an agent — server-only.
 */
export async function fetchAgentReviewStats(agentId: string): Promise<AgentReviewStats | null> {
  try {
    const res = await fetch(
      `${API_BASE_URL}/reviews/stats?targetType=AGENT&targetId=${agentId}`,
      { next: { revalidate: 300 } },
    );

    if (!res.ok) return null;
    return (await res.json()) as AgentReviewStats;
  } catch {
    return null;
  }
}

/**
 * Fetch listings managed by a given agent — server-only.
 * Returns `{ data: [], total: 0 }` on error so callers degrade gracefully.
 */
export async function fetchAgentListings(
  agentId: string,
  page = 1,
  limit = 50,
): Promise<{ data: ListingDetail[]; total: number }> {
  try {
    const qs = new URLSearchParams({
      agentId,
      page: String(page),
      limit: String(limit),
    });
    const res = await fetch(`${API_BASE_URL}/listings?${qs.toString()}`, {
      next: { revalidate: 300 },
    });

    if (!res.ok) return { data: [], total: 0 };
    const result = (await res.json()) as PaginatedResult<ListingDetail>;
    return { data: result.data, total: result.total };
  } catch {
    return { data: [], total: 0 };
  }
}