[Hook line — stops the scroll, shown before "...more"]

[Empty line for spacing]

[Body — value, story, or insight. Written conversationally.]

[Break long paragraphs into 2-3 sentences max.]

[Include searchable keywords naturally — Instagram now does SEO]

[CTA — question, save prompt, or share prompt]

.
.
.
[Hashtags below dot spacers — or in first comment]

// Instagram Graph API uses Facebook's OAuth
// Requires: Facebook Page + Instagram Professional account linked

// Step 1: Get Facebook User Access Token via Facebook Login
const FB_AUTH_URL = 'https://www.facebook.com/v19.0/dialog/oauth';
const params = new URLSearchParams({
  client_id: process.env.FB_APP_ID,
  redirect_uri: process.env.REDIRECT_URI,
  scope: 'instagram_basic,instagram_content_publish,instagram_manage_insights,pages_show_list,pages_read_engagement',
  response_type: 'code',
});
// Redirect to: FB_AUTH_URL + '?' + params

// Step 2: Exchange code for token
const tokenRes = await fetch(`https://graph.facebook.com/v19.0/oauth/access_token?client_id=${FB_APP_ID}&client_secret=${FB_APP_SECRET}&redirect_uri=${REDIRECT_URI}&code=${code}`);
const { access_token } = await tokenRes.json();

// Step 3: Get long-lived token (60 days)
const longLivedRes = await fetch(`https://graph.facebook.com/v19.0/oauth/access_token?grant_type=fb_exchange_token&client_id=${FB_APP_ID}&client_secret=${FB_APP_SECRET}&fb_exchange_token=${access_token}`);
const { access_token: longLivedToken } = await longLivedRes.json();

// Step 4: Get Instagram Business Account ID
const pagesRes = await fetch(`https://graph.facebook.com/v19.0/me/accounts?access_token=${longLivedToken}`);
const { data: pages } = await pagesRes.json();
const pageId = pages[0].id;

const igRes = await fetch(`https://graph.facebook.com/v19.0/${pageId}?fields=instagram_business_account&access_token=${longLivedToken}`);
const { instagram_business_account: { id: igAccountId } } = await igRes.json();

// Publish single image
// Step 1: Create media container
const containerRes = await fetch(`https://graph.facebook.com/v19.0/${igAccountId}/media`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    image_url: 'https://example.com/image.jpg', // Must be public URL
    caption: 'Your caption here\n\n#hashtag1 #hashtag2',
    access_token: longLivedToken,
  }),
});
const { id: containerId } = await containerRes.json();

// Step 2: Publish
await fetch(`https://graph.facebook.com/v19.0/${igAccountId}/media_publish`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    creation_id: containerId,
    access_token: longLivedToken,
  }),
});

// Publish carousel
const mediaIds = [];
for (const imageUrl of imageUrls) {
  const res = await fetch(`https://graph.facebook.com/v19.0/${igAccountId}/media`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      image_url: imageUrl,
      is_carousel_item: true,
      access_token: longLivedToken,
    }),
  });
  const { id } = await res.json();
  mediaIds.push(id);
}

const carouselRes = await fetch(`https://graph.facebook.com/v19.0/${igAccountId}/media`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    media_type: 'CAROUSEL',
    children: mediaIds,
    caption: 'Carousel caption...',
    access_token: longLivedToken,
  }),
});
const { id: carouselId } = await carouselRes.json();

await fetch(`https://graph.facebook.com/v19.0/${igAccountId}/media_publish`, {
  method: 'POST',
  body: JSON.stringify({ creation_id: carouselId, access_token: longLivedToken }),
});

// Publish Reel
const reelContainer = await fetch(`https://graph.facebook.com/v19.0/${igAccountId}/media`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    media_type: 'REELS',
    video_url: 'https://example.com/reel.mp4', // Public URL, mp4, H.264
    caption: 'Reel caption...',
    share_to_feed: true,
    cover_url: 'https://example.com/cover.jpg', // Optional custom cover
    access_token: longLivedToken,
  }),
});

// Account insights
const insightsRes = await fetch(
  `https://graph.facebook.com/v19.0/${igAccountId}/insights?metric=impressions,reach,profile_views,follower_count&period=day&since=${startDate}&until=${endDate}&access_token=${longLivedToken}`
);

// Media insights
const mediaInsightsRes = await fetch(
  `https://graph.facebook.com/v19.0/${mediaId}/insights?metric=impressions,reach,engagement,saved,shares&access_token=${longLivedToken}`
);

// Reel insights
const reelInsightsRes = await fetch(
  `https://graph.facebook.com/v19.0/${reelId}/insights?metric=plays,reach,likes,comments,shares,saved,total_interactions&access_token=${longLivedToken}`
);