import type { Campaign, Lead } from "@/lib/domain"
import { formatShort } from "@/lib/time"

function escapeCell(v: string) {
  if (v.includes('"') || v.includes(",") || v.includes("\n")) {
    return `"${v.replace(/"/g, '""')}"`
  }
  return v
}

export function leadsToCsv(args: { campaign: Campaign; leads: Lead[] }) {
  const fieldOrder = args.campaign.formSchema.map((f) => f.id)
  const header = [
    "createdAt",
    "state",
    "utm_source",
    "utm_medium",
    "utm_campaign",
    "couponCode",
    "redeemedAt",
    ...fieldOrder.map((id) => `field_${id}`),
  ]

  const rows = args.leads.map((l) => [
    formatShort(l.createdAt),
    l.state,
    l.source.utm_source ?? "",
    l.source.utm_medium ?? "",
    l.source.utm_campaign ?? "",
    l.couponCode ?? "",
    l.redeemedAt ? formatShort(l.redeemedAt) : "",
    ...fieldOrder.map((id) => l.fields[id] ?? ""),
  ])

  const lines = [header, ...rows].map((r) => r.map((c) => escapeCell(`${c ?? ""}`)).join(","))
  return lines.join("\n")
}

export function downloadTextFile(args: { filename: string; text: string; mime: string }) {
  const blob = new Blob([args.text], { type: args.mime })
  const url = URL.createObjectURL(blob)
  const a = document.createElement("a")
  a.href = url
  a.download = args.filename
  document.body.appendChild(a)
  a.click()
  a.remove()
  URL.revokeObjectURL(url)
}