"use server";

import { createElement } from "react";
import { headers } from "next/headers";

import { ContactConfirmationEmail } from "@/emails/ContactConfirmationEmail";
import { ContactRequestEmail } from "@/emails/ContactRequestEmail";
import {
  contactRequestSchema,
  contactRequestTypeLabels,
  type ContactSubmissionPayload,
} from "@/lib/contact-schema";
import { getAppEmailConfigError, sendAppEmail } from "@/lib/mail";
import { rateLimit } from "@/lib/rate-limit";

const DEFAULT_ADMIN_EMAIL = "kontakt@kita-planer.local";
const RATE_LIMIT_MAX = 5;
const RATE_LIMIT_WINDOW_SECONDS = 60 * 60;

async function resolveClientIp(): Promise<string> {
  const h = await headers();
  const forwarded = h.get("x-forwarded-for");
  if (forwarded) {
    return forwarded.split(",")[0]?.trim() || "unknown";
  }
  return h.get("x-real-ip") ?? "unknown";
}

export async function submitContactRequest(data: ContactSubmissionPayload) {
  // Honeypot: silently absorb bot submissions without informing them.
  if (data.website && data.website.trim().length > 0) {
    return { success: true };
  }

  const ip = await resolveClientIp();
  const limit = rateLimit(
    `contact:${ip}`,
    RATE_LIMIT_MAX,
    RATE_LIMIT_WINDOW_SECONDS,
  );
  if (!limit.allowed) {
    const minutes = Math.max(1, Math.ceil(limit.retryAfterSeconds / 60));
    return {
      success: false,
      error: `Zu viele Anfragen. Bitte versuche es in ${minutes} Minuten erneut.`,
    };
  }

  const parsed = contactRequestSchema.safeParse(data);
  if (!parsed.success) {
    return {
      success: false,
      error: "Bitte prüfe deine Eingaben und versuche es erneut.",
    };
  }

  const configError = getAppEmailConfigError();
  if (configError) {
    return {
      success: false,
      error: configError,
    };
  }

  const adminEmail = process.env.ADMIN_EMAIL || DEFAULT_ADMIN_EMAIL;
  const inquiryLabel = contactRequestTypeLabels[parsed.data.requestType];

  const [adminResult, confirmationResult] = await Promise.all([
    sendAppEmail({
      to: adminEmail,
      subject: `Kontaktanfrage: ${inquiryLabel} von ${parsed.data.name}`,
      replyTo: parsed.data.email,
      react: createElement(ContactRequestEmail, parsed.data),
    }),
    sendAppEmail({
      to: parsed.data.email,
      subject: "Wir haben deine Anfrage erhalten — Kita-Planer",
      replyTo: adminEmail,
      react: createElement(ContactConfirmationEmail, parsed.data),
    }),
  ]);

  if (!adminResult.success) {
    return {
      success: false,
      error: adminResult.error,
    };
  }

  if (!confirmationResult.success) {
    console.error(
      "Bestätigungs-E-Mail konnte nicht zugestellt werden:",
      confirmationResult.error,
    );
  }

  return { success: true };
}