const API_BASE = 'https://api.dongfeng-systems.org'

export interface NewsItem {
  title: string
  publisher: string
  score: number
  publishedAt: string
  url: string
}

/**
 * Fetch news items for a given keyword
 * @param keyword - Symbol or topic to search for
 * @param requestAmount - Number of items to request (default: 10)
 * @returns Array of news items sorted by publishedAt (newest first)
 */
export async function getNewsFeed(
  keyword: string,
  user: string = 'frontend',
  requestAmount: number = 10
): Promise<NewsItem[]> {
  const encodedKeyword = encodeURIComponent(keyword)

  const res = await fetch(
    `${API_BASE}/api/news-sentiment/feed?user=${encodeURIComponent(user)}&keyword=${encodedKeyword}&request-amount=${requestAmount}`,
    { cache: 'no-store' }
  )

  if (!res.ok) {
    throw new Error(`Failed to fetch news for "${keyword}"`)
  }

  const items: NewsItem[] = await res.json()

  // Sort by publishedAt descending (newest first)
  return items.sort((a, b) => {
    const dateA = new Date(a.publishedAt).getTime()
    const dateB = new Date(b.publishedAt).getTime()
    return dateB - dateA
  })
}

/**
 * Trigger a server-side refresh of the news sentiment cache.
 * @returns true if the server refreshed successfully, false otherwise
 */
export async function refreshNewsFeed(user: string = 'frontend'): Promise<boolean> {
  const res = await fetch(
    `${API_BASE}/api/news-sentiment/refresh?user=${encodeURIComponent(user)}`,
    { cache: 'no-store' }
  )
  if (!res.ok) return false
  const result = await res.json()
  // API returns a boolean directly
  return result === true || result?.success === true
}


export function formatPublishedDate(isoDateString: string): string {
  try {
    const date = new Date(isoDateString)
    return date.toLocaleDateString('en-US', {
      month: 'short',
      day: 'numeric',
      hour: '2-digit',
      minute: '2-digit',
    })
  } catch {
    return isoDateString
  }
}