"use client"

import { useEffect, useState, useTransition } from "react"
import { toast } from "sonner"
import { RefreshCw, Link2, CheckCircle2, AlertTriangle, BookOpen } from "lucide-react"
import { formatDate } from "@/lib/utils"
import { syncAccountingNow, disconnectAccounting } from "@/app/actions/accounting"

type Conn = { provider: string; orgName: string | null; status: string; lastSyncAt: string | null; lastError: string | null }
type Prov = { id: string; label: string; configured: boolean }

const ERR_MSG: Record<string, string> = {
  connect_failed: "Connection failed — please try again.",
  invalid_state: "The callback was invalid. Please retry the connection.",
  owner_only: "Only the account owner can manage integrations.",
  not_configured: "That provider isn't configured on the server yet.",
  unknown_provider: "Unknown provider.",
}

export function AccountingIntegrations({
  providers,
  connections,
  isOwner,
  flash,
}: {
  providers: Prov[]
  connections: Conn[]
  isOwner: boolean
  flash: { connected?: string; error?: string }
}) {
  const connByProvider: Record<string, Conn> = Object.fromEntries(connections.map((c) => [c.provider, c]))
  const [pending, start] = useTransition()
  const [busy, setBusy] = useState<string | null>(null)

  useEffect(() => {
    if (flash.connected) toast.success(`Connected to ${flash.connected === "quickbooks" ? "QuickBooks" : "Xero"}`)
    if (flash.error) toast.error(ERR_MSG[flash.error] ?? "Something went wrong")
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [])

  function sync(id: string) {
    setBusy(id)
    start(async () => {
      try {
        const r = await syncAccountingNow(id)
        toast.success(`Synced ${r.income} income + ${r.expense} expense entries`)
      } catch (e) {
        toast.error((e as Error).message || "Sync failed")
      } finally {
        setBusy(null)
      }
    })
  }

  function remove(id: string) {
    if (!confirm("Disconnect this integration? Future income/expenses won't sync until you reconnect.")) return
    setBusy(id)
    start(async () => {
      try {
        await disconnectAccounting(id)
        toast.success("Disconnected")
      } catch {
        toast.error("Couldn't disconnect")
      } finally {
        setBusy(null)
      }
    })
  }

  if (!isOwner) {
    return (
      <div className="rounded-xl border border-white/[0.06] bg-[#16161f] p-6 text-sm text-white/50">
        Only the account owner can manage accounting integrations.
      </div>
    )
  }

  return (
    <div className="space-y-3">
      {providers.map((p) => {
        const conn = connByProvider[p.id]
        const isBusy = pending && busy === p.id
        return (
          <div key={p.id} className="rounded-2xl border border-white/[0.06] bg-[#16161f] p-5">
            <div className="flex items-start justify-between gap-4">
              <div className="flex items-center gap-3">
                <div className="flex h-10 w-10 items-center justify-center rounded-xl bg-white/[0.04] text-white/70">
                  <BookOpen className="h-5 w-5" />
                </div>
                <div>
                  <p className="text-sm font-semibold text-white">{p.label}</p>
                  {conn ? (
                    <p className="text-xs text-white/40">
                      {conn.orgName ?? "Connected"} · Last sync {conn.lastSyncAt ? formatDate(conn.lastSyncAt) : "never"}
                    </p>
                  ) : (
                    <p className="text-xs text-white/40">Push rent income &amp; expenses to {p.label}</p>
                  )}
                </div>
              </div>

              {conn ? (
                <span
                  className={`flex shrink-0 items-center gap-1.5 rounded-full border px-2.5 py-1 text-[11px] font-medium ${
                    conn.status === "error"
                      ? "border-red-500/20 bg-red-500/10 text-red-400"
                      : "border-emerald-500/20 bg-emerald-500/10 text-emerald-400"
                  }`}
                >
                  {conn.status === "error" ? <AlertTriangle className="h-3 w-3" /> : <CheckCircle2 className="h-3 w-3" />}
                  {conn.status === "error" ? "Error" : "Connected"}
                </span>
              ) : p.configured ? null : (
                <span className="shrink-0 rounded-full border border-amber-500/20 bg-amber-500/10 px-2.5 py-1 text-[11px] font-medium text-amber-400">
                  Not configured
                </span>
              )}
            </div>

            {conn?.status === "error" && conn.lastError && (
              <p className="mt-3 rounded-lg border border-red-500/15 bg-red-500/[0.06] px-3 py-2 text-xs text-red-300/90">{conn.lastError}</p>
            )}

            <div className="mt-4 flex items-center gap-2">
              {conn ? (
                <>
                  <button
                    onClick={() => sync(p.id)}
                    disabled={isBusy}
                    className="flex items-center gap-1.5 rounded-lg bg-indigo-600 px-3 py-1.5 text-xs font-semibold text-white transition hover:bg-indigo-500 disabled:opacity-50"
                  >
                    <RefreshCw className={`h-3.5 w-3.5 ${isBusy ? "animate-spin" : ""}`} /> Sync now
                  </button>
                  <button
                    onClick={() => remove(p.id)}
                    disabled={isBusy}
                    className="rounded-lg border border-white/10 px-3 py-1.5 text-xs font-medium text-white/60 transition hover:bg-white/[0.06] hover:text-white disabled:opacity-50"
                  >
                    Disconnect
                  </button>
                </>
              ) : p.configured ? (
                <a
                  href={`/api/integrations/${p.id}/connect`}
                  className="flex items-center gap-1.5 rounded-lg bg-indigo-600 px-3 py-1.5 text-xs font-semibold text-white transition hover:bg-indigo-500"
                >
                  <Link2 className="h-3.5 w-3.5" /> Connect {p.label}
                </a>
              ) : (
                <p className="text-xs text-white/30">
                  Set this provider&apos;s OAuth credentials on the server to enable connecting.
                </p>
              )}
            </div>
          </div>
        )
      })}

      <p className="px-1 text-[11px] text-white/30">
        One-way sync — paid rent is pushed as income and expenses as bills/purchases. We never read or modify existing data in your books.
      </p>
    </div>
  )
}