// Name: Deduplicate Emails
// Description: Accepts a comma-separated list of emails, returns a deduplicated string and lists which emails had duplicates.
// Author: zacjones93
// GitHub: zacjones93
import "@johnlindquist/kit"

const input = await arg({
  placeholder: "Paste comma-separated emails",
  enter: "Deduplicate",
  strict: false,
})

const tokens = input
  .replace(/[\n\r;]+/g, ",")
  .split(",")
  .map(s => s.trim())
  .filter(Boolean)

const counts = new Map<string, number>()
const firstOriginal = new Map<string, string>() // normalized -> first seen original

for (const email of tokens) {
  const norm = email.toLowerCase()
  if (!firstOriginal.has(norm)) firstOriginal.set(norm, email)
  counts.set(norm, (counts.get(norm) || 0) + 1)
}

const deduped = Array.from(firstOriginal.values())
const dedupedCSV = deduped.join(", ")

const duplicates = Array.from(counts.entries())
  .filter(([_, c]) => c > 1)
  .map(([norm, c]) => ({
    email: firstOriginal.get(norm) || norm,
    count: c,
  }))

await copy(dedupedCSV)
toast("Copied deduplicated list to clipboard")

const summary = md(`
# Deduplicated Emails

- Total provided: ${tokens.length}
- Unique: ${deduped.length}
- Duplicates found: ${duplicates.length}

## Deduplicated CSV
\`\`\`
${dedupedCSV}
\`\`\`

${
  duplicates.length
    ? `## Emails with duplicates
${duplicates.map(d => `- ${d.email} (${d.count} occurrences)`).join("\n")}`
    : `## Emails with duplicates
- None 🎉`
}
`)

await div(summary)