"use client"

import { useState } from "react"
import { useRouter } from "next/navigation"
import { useTranslation } from "react-i18next"
import { toast } from "sonner"

import { Button } from "@/components/ui/button"
import { LoadingSpinner } from "@/components/ui/loading-spinner"
import { useAuth } from "@/context/auth-context"
import {
  getGoogleClientId,
  loadGoogleIdentityServices,
  requestGoogleAuthCode,
} from "@/lib/google-gsi"
import { queueWelcomeFlow } from "@/lib/welcome-flow"

function GoogleIcon() {
  return (
    <svg viewBox="0 0 24 24" className="size-4" aria-hidden>
      <path
        fill="#4285F4"
        d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09Z"
      />
      <path
        fill="#34A853"
        d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23Z"
      />
      <path
        fill="#FBBC05"
        d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62Z"
      />
      <path
        fill="#EA4335"
        d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53Z"
      />
    </svg>
  )
}

export function AuthSocialButtons({
  mode,
  onNavigate,
}: {
  mode: "login" | "signup"
  onNavigate?: () => void
}) {
  const { t } = useTranslation("auth")
  const router = useRouter()
  const { loginWithGoogle } = useAuth()
  const [pending, setPending] = useState(false)

  async function handleGoogle() {
    const clientId = getGoogleClientId()
    if (!clientId) {
      toast.error(t("social.notConfigured"))
      return
    }

    setPending(true)
    onNavigate?.()
    try {
      await loadGoogleIdentityServices()
      const code = await requestGoogleAuthCode(clientId)
      const result = await loginWithGoogle({ intent: mode, code })

      if (!result.ok) {
        toast.error(result.error)
        return
      }

      if (result.requiresTwoFactor) {
        router.replace("/2fa")
        return
      }

      if (result.isNewUser) {
        queueWelcomeFlow()
        router.replace(result.accessAllowed ? "/home/?welcome=1" : "/trial-ended")
        return
      }

      toast.success(
        result.accessAllowed ? t("login.toastWelcome") : t("login.toastTrialEnded")
      )
      router.replace(result.accessAllowed ? "/home" : "/trial-ended")
    } catch (err) {
      if (err instanceof Error && err.message === "POPUP_CLOSED") return
      toast.error(err instanceof Error ? err.message : t("social.failed"))
    } finally {
      setPending(false)
    }
  }

  return (
    <div className="pt-2">
      <div className="relative mb-3">
        <div className="absolute inset-0 flex items-center">
          <span className="w-full border-t border-border/80" />
        </div>
        <div className="relative flex justify-center text-[11px] uppercase tracking-wide">
          <span className="bg-card px-3 text-muted-foreground">{t("social.or")}</span>
        </div>
      </div>
      <Button
        type="button"
        variant="outline"
        className="h-10 w-full rounded-lg border-border/80 bg-background text-xs font-medium shadow-none hover:bg-muted/50"
        onClick={() => void handleGoogle()}
        disabled={pending}
      >
        {pending ? <LoadingSpinner size="sm" /> : <GoogleIcon />}
        {pending ? t("social.connecting") : t("social.continueWithGoogle")}
      </Button>
    </div>
  )
}