fix: exclude the account owner from their own analysis

Liking or commenting on your own content showed your own account as
something that "captures" you. Derive the owner username from the export
filename (instagram-<username>-<date>-<hash>.zip) and drop self from both
interactions and follows.

Author: Endika

src/main.ts

@@ -1,5 +1,6 @@
 import JSZip from 'jszip'
 import { detectAdapter } from './adapters/registry'
+import { excludeSelf, ownerFromFilename } from './owner'
 import { analyze } from './report-model'
 import { renderReport } from './ui/view'
 import './style.css'
@@ -38,7 +39,9 @@ async function handleFile(file: File, results: HTMLElement): Promise<void> {
       status.textContent = 'Unrecognized export. Is this an Instagram .zip downloaded in JSON format?'
       return
     }
-    const data = await adapter.parse(zip)
+    // Exclude the account owner — you don't influence yourself. The owner is taken
+    // from the export filename (instagram-<username>-<date>-<hash>.zip).
+    const data = excludeSelf(await adapter.parse(zip), ownerFromFilename(file.name))
     if (data.interactions.length === 0) {
       status.textContent = 'No likes/comments found. Did you download in HTML instead of JSON format?'
       return

src/owner.ts

@@ -0,0 +1,24 @@
+import type { NormalizedData } from './schema'
+
+/**
+ * Instagram names the export file `instagram-<username>-<YYYY>-<MM>-<DD>-<hash>.zip`.
+ * The username is the account owner — we use it to exclude self-interactions.
+ */
+export function ownerFromFilename(filename: string): string | null {
+  const match = filename.match(/^instagram-(.+?)-\d{4}-\d{2}-\d{2}-/i)
+  return match ? match[1] : null
+}
+
+/**
+ * Drop the account owner from their own data: commenting on or liking your own
+ * content is not "being influenced by yourself". Comparison is case-insensitive.
+ */
+export function excludeSelf(data: NormalizedData, self: string | null): NormalizedData {
+  if (!self) return data
+  const key = self.toLowerCase()
+  return {
+    interactions: data.interactions.filter((i) => i.account.toLowerCase() !== key),
+    follows: new Set([...data.follows].filter((a) => a.toLowerCase() !== key)),
+    unattributed: data.unattributed,
+  }
+}

tests/owner.test.ts

@@ -0,0 +1,36 @@
+import { describe, expect, it } from 'vitest'
+import type { NormalizedData } from '../src/schema'
+import { excludeSelf, ownerFromFilename } from '../src/owner'
+
+describe('ownerFromFilename', () => {
+  it('extracts the username from an Instagram export filename', () => {
+    expect(ownerFromFilename('instagram-endika_iglesias-2026-05-30-QSxZWh2s.zip')).toBe(
+      'endika_iglesias',
+    )
+  })
+  it('returns null for an unrelated filename', () => {
+    expect(ownerFromFilename('my-export.zip')).toBeNull()
+  })
+})
+
+describe('excludeSelf', () => {
+  const data: NormalizedData = {
+    interactions: [
+      { account: 'friend', kind: 'story_like', timestamp: 1 },
+      { account: 'Endika_Iglesias', kind: 'comment', timestamp: 2 },
+    ],
+    follows: new Set(['friend', 'endika_iglesias']),
+    unattributed: 3,
+  }
+
+  it('removes the owner from interactions and follows, case-insensitively', () => {
+    const out = excludeSelf(data, 'endika_iglesias')
+    expect(out.interactions.map((i) => i.account)).toEqual(['friend'])
+    expect(out.follows).toEqual(new Set(['friend']))
+    expect(out.unattributed).toBe(3)
+  })
+
+  it('is a no-op when the owner is unknown', () => {
+    expect(excludeSelf(data, null)).toBe(data)
+  })
+})