import { NextResponse } from "next/server";

type ContactPayload = {
  name?: string;
  phone?: string;
  email?: string;
  projectType?: string;
  materialInterest?: string;
  message?: string;
};

function isValidEmail(value: string) {
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value);
}

function isValidPhone(value: string) {
  return /^[0-9()+.\-\s]{10,}$/.test(value);
}

export async function POST(request: Request) {
  const payload = (await request.json()) as ContactPayload;
  const fieldErrors: Record<string, string> = {};

  const name = payload.name?.trim() ?? "";
  const phone = payload.phone?.trim() ?? "";
  const email = payload.email?.trim() ?? "";
  const message = payload.message?.trim() ?? "";

  if (!name) {
    fieldErrors.name = "Please enter your full name.";
  }

  if (!phone) {
    fieldErrors.phone = "Please enter a phone number.";
  } else if (!isValidPhone(phone)) {
    fieldErrors.phone = "Please enter a valid phone number.";
  }

  if (!email) {
    fieldErrors.email = "Please enter an email address.";
  } else if (!isValidEmail(email)) {
    fieldErrors.email = "Please enter a valid email address.";
  }

  if (!message) {
    fieldErrors.message = "Please describe your project or material request.";
  }

  if (Object.keys(fieldErrors).length > 0) {
    return NextResponse.json(
      {
        success: false,
        message: "Please correct the highlighted fields and try again.",
        fieldErrors,
      },
      { status: 400 },
    );
  }

  return NextResponse.json({
    success: true,
    message:
      "Thanks for reaching out. This form is wired to a placeholder API route and ready for email delivery integration.",
  });
}