"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import { ArrowLeft } from "lucide-react";
import { createCompany, updateCompany } from "./actions";
import { CompanyBrandingUploader } from "./company-branding-uploader";

export type CompanyFormData = {
  id: string;
  name: string;
  code: string | null;
  gstNumber: string | null;
  address: string | null;
  telephone: string | null;
  mobile: string | null;
  email: string | null;
  invoiceEmail: string | null;
  invoiceAddress: string | null;
  logoUrl: string | null;
  stampUrl: string | null;
  isActive: boolean;
};

const INPUT = "w-full rounded-lg border border-neutral-300 px-3 py-2 text-sm focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-primary-500/20";
const LABEL = "block text-xs font-medium text-neutral-700 mb-1";

function CompanyFormFields({ company }: { company?: CompanyFormData }) {
  return (
    <div className="space-y-3">
      <div className="grid grid-cols-3 gap-3">
        <div className="col-span-2">
          <label className={LABEL}>Company Name *</label>
          <input name="name" defaultValue={company?.name} required className={INPUT} placeholder="e.g. Pelagia Marine Services Pvt. Ltd." />
        </div>
        <div>
          <label className={LABEL}>Code * <span className="font-normal text-neutral-400">(used in PO numbers)</span></label>
          <input name="code" defaultValue={company?.code ?? ""} required maxLength={10}
            className={`${INPUT} uppercase`} placeholder="e.g. PMS"
            style={{ textTransform: "uppercase" }} />
        </div>
      </div>
      <div className="grid grid-cols-2 gap-3">
        <div>
          <label className={LABEL}>GST Number</label>
          <input name="gstNumber" defaultValue={company?.gstNumber ?? ""} className={INPUT} placeholder="e.g. 27AAHCP5787B1Z6" />
        </div>
        <div className="col-span-2">
          <label className={LABEL}>Contact Email</label>
          <input name="email" type="email" defaultValue={company?.email ?? ""} className={INPUT} placeholder="contact@company.com" />
        </div>
        <div>
          <label className={LABEL}>Invoice Email <span className="font-normal text-neutral-400">(shown on POs)</span></label>
          <input name="invoiceEmail" type="email" defaultValue={company?.invoiceEmail ?? ""} className={INPUT} placeholder="accounts@company.com" />
        </div>
        <div>
          <label className={LABEL}>Telephone</label>
          <input name="telephone" defaultValue={company?.telephone ?? ""} className={INPUT} placeholder="+91-22-1234 5678" />
        </div>
        <div>
          <label className={LABEL}>Mobile</label>
          <input name="mobile" defaultValue={company?.mobile ?? ""} className={INPUT} placeholder="+91 98765 43210" />
        </div>
      </div>
      <div>
        <label className={LABEL}>Address</label>
        <textarea name="address" defaultValue={company?.address ?? ""} rows={2} className={INPUT} placeholder="Office address" />
      </div>
      <div>
        <label className={LABEL}>Invoice Address <span className="font-normal text-neutral-400">(shown on exported POs)</span></label>
        <textarea name="invoiceAddress" defaultValue={company?.invoiceAddress ?? ""} rows={2} className={INPUT} placeholder="Full address as it should appear on invoices/POs" />
      </div>
    </div>
  );
}

export function CompanyForm({ company }: { company?: CompanyFormData }) {
  const router = useRouter();
  const isEdit = !!company?.id;
  const [pending, setPending] = useState(false);
  const [error, setError] = useState("");

  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault();
    setPending(true);
    setError("");
    const fd = new FormData(e.currentTarget);

    if (isEdit) {
      fd.set("id", company!.id);
      const result = await updateCompany(fd);
      if ("error" in result) { setError(result.error); setPending(false); return; }
      router.push("/admin/companies");
      router.refresh();
    } else {
      const result = await createCompany(fd);
      if ("error" in result) { setError(result.error); setPending(false); return; }
      // Land on the edit page so the logo/stamp can be uploaded against the new company.
      router.push(`/admin/companies/${result.id}/edit`);
      router.refresh();
    }
  }

  return (
    <div className="max-w-3xl">
      <Link href="/admin/companies" className="inline-flex items-center gap-1.5 text-sm text-neutral-500 hover:text-neutral-700 mb-3">
        <ArrowLeft className="h-3.5 w-3.5" /> Back to Companies
      </Link>
      <h1 className="text-2xl font-semibold text-neutral-900">{isEdit ? `Edit — ${company!.name}` : "Add Company"}</h1>
      <p className="text-sm text-neutral-500 mt-0.5 mb-6">Sister company used for invoicing and purchase orders</p>

      <form onSubmit={handleSubmit} className="space-y-4">
        <div className="rounded-lg border border-neutral-200 bg-white p-5">
          <CompanyFormFields company={company} />
        </div>
        {error && <p className="text-sm text-danger-700 bg-danger-50 rounded-lg px-3 py-2">{error}</p>}
        <div className="flex justify-end gap-3">
          <Link href="/admin/companies"
            className="rounded-lg border border-neutral-300 px-4 py-2 text-sm font-medium text-neutral-700 hover:bg-neutral-50">
            Cancel
          </Link>
          <button type="submit" disabled={pending}
            className="rounded-lg bg-primary-600 px-4 py-2 text-sm font-semibold text-white hover:bg-primary-700 disabled:opacity-60">
            {pending ? (isEdit ? "Saving…" : "Creating…") : (isEdit ? "Save Changes" : "Create Company")}
          </button>
        </div>
      </form>

      {/* ── Branding (independent uploads; available once the company exists) ── */}
      <div className="rounded-lg border border-neutral-200 bg-white p-5 mt-6">
        <h2 className="text-sm font-semibold text-neutral-800">Branding</h2>
        <p className="text-xs text-neutral-400 mb-3">Logo and stamp shown on exported POs</p>
        {isEdit ? (
          <div className="grid grid-cols-2 gap-4">
            <CompanyBrandingUploader
              companyId={company!.id} type="logo" label="Logo"
              hint="PNG, JPG or WebP — shown top-left. Max 4 MB"
              currentUrl={company!.logoUrl}
            />
            <CompanyBrandingUploader
              companyId={company!.id} type="stamp" label="Stamp / Seal"
              hint="PNG, JPG or WebP — shown in signatory block. Max 4 MB"
              currentUrl={company!.stampUrl}
            />
          </div>
        ) : (
          <p className="text-xs text-neutral-400">Create the company first — you&apos;ll be taken to the edit page where you can upload a logo and stamp.</p>
        )}
      </div>
    </div>
  );
}