"use client";

// components/DirectorResignationTab.tsx
// Send a director's Letter of Resignation. Mirrors DirectorAppointmentTab UX:
// pick director + company → preview recipients → send.
// On submit, POST /api/resignations which creates the PB record + emails the
// director with a sign link.

import { useState } from "react";
import SearchableSelect, { type SearchableSelectRecord } from "./SearchableSelect";

// PB row shapes for the picker. Cast happens at the JSX site; we keep these
// type aliases so the rest of the file reads naturally.
type DirectorRow = SearchableSelectRecord & {
  first_names?: string;
  surname?: string;
  email?: string;
  telephone?: string;
};
type CompanyRow = SearchableSelectRecord & {
  enterprise_name?: string;
  company_email?: string;
};

type RecipientStatus = "valid" | "missing" | "invalid";
interface Recipient {
  key: string;
  label: string;
  email: string;
  role: string;
  status: RecipientStatus;
}
interface PreviewReport {
  recipients: Recipient[];
  problems: number;
}

function StatusDot({ status }: { status: RecipientStatus }) {
  if (status === "valid") return <span className="inline-flex items-center justify-center w-5 h-5 rounded-full bg-green-100 text-green-700 text-xs font-bold flex-shrink-0" title="Valid email">✓</span>;
  if (status === "missing") return <span className="inline-flex items-center justify-center w-5 h-5 rounded-full bg-amber-100 text-amber-700 text-xs font-bold flex-shrink-0" title="Missing email">!</span>;
  return <span className="inline-flex items-center justify-center w-5 h-5 rounded-full bg-red-100 text-red-700 text-xs font-bold flex-shrink-0" title="Invalid format">x</span>;
}

export default function DirectorResignationTab() {
  const [showModal, setShowModal] = useState(false);
  const [sending, setSending] = useState(false);
  const [previewing, setPreviewing] = useState(false);
  const [sendError, setSendError] = useState<string | null>(null);
  const [sent, setSent] = useState<{ id: string; signUrl: string } | null>(null);
  const [selectedDirector, setSelectedDirector] = useState<DirectorRow | null>(null);
  const [selectedCompany, setSelectedCompany] = useState<CompanyRow | null>(null);
  const [report, setReport] = useState<PreviewReport | null>(null);

  const openModal = () => {
    setShowModal(true);
    setSendError(null);
    setSent(null);
    setSelectedDirector(null);
    setSelectedCompany(null);
    setReport(null);
    // Director + company lists are fetched on-demand by the SearchableSelect
    // when the user opens the dropdown — no upfront load.
  };

  const handlePreview = async () => {
    if (!selectedDirector || !selectedCompany) {
      setSendError("Please select a company and a director first.");
      return;
    }
    setPreviewing(true);
    setSendError(null);
    setReport(null);

    try {
      const director = selectedDirector;
      const company = selectedCompany;

      // Re-fetch to get the freshest email/company_email.
      const dirDetails = await fetch(`/api/pb/records/${director.id}?collection=ysterbaard_directors&fields=id,first_names,surname,email`).then((r) => r.ok ? r.json() : null).catch(() => null);
      const coDetails = await fetch(`/api/pb/records/${company.id}?collection=ysterbaard_companies&fields=id,enterprise_name,company_email`).then((r) => r.ok ? r.json() : null).catch(() => null);

      const emailRx = /^[A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}$/;
      const classify = (e: string | undefined | null): RecipientStatus => {
        const v = (e ?? "").trim();
        if (!v) return "missing";
        return emailRx.test(v) ? "valid" : "invalid";
      };

      const dirLabel = [director.first_names, director.surname].filter(Boolean).join(" ") || director.id;
      const recipients: Recipient[] = [
        {
          key: "director",
          label: `Director: ${dirLabel}`,
          email: dirDetails?.email ?? director.email ?? "",
          role: "to",
          status: classify(dirDetails?.email ?? director.email),
        },
        {
          key: "company_email",
          label: `Company: ${coDetails?.enterprise_name ?? company.enterprise_name ?? company.id}`,
          email: coDetails?.company_email ?? "",
          role: "to",
          status: classify(coDetails?.company_email),
        },
      ];

      const problems = recipients.filter((r) => r.status !== "valid").length;
      setReport({ recipients, problems });
    } catch (err: unknown) {
      setSendError(err instanceof Error ? err.message : "Validation failed.");
    } finally {
      setPreviewing(false);
    }
  };

  const handleSend = async (proceedAnyway: boolean) => {
    if (!selectedDirector || !selectedCompany) return;
    setSending(true);
    setSendError(null);

    try {
      const res = await fetch("/api/resignations", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          director_id: selectedDirector.id,
          company_id: selectedCompany.id,
          proceed_anyway: proceedAnyway,
        }),
      });

      // The route answers 502 (not 200) when the mail itself failed, and
      // 500 on a hard error. Previously it answered 200 with
      // { ok: false } and this client ignored `ok` — so the UI showed
      // "Letter sent successfully" while nothing had left the machine.
      const data = await res.json().catch(() => ({} as Record<string, unknown>));

      if (!res.ok) {
        throw new Error(
          (data?.error as string) ||
            (data?.warning as string) ||
            `Letter failed (HTTP ${res.status})`
        );
      }

      if (data?.ok === false) {
        throw new Error(
          (data?.warning as string) || "The letter was saved but the email could not be sent."
        );
      }

      const signToken = data?.record?.sign_token;
      const baseUrl = typeof window !== "undefined" ? window.location.origin : "";
      setSent({
        id: data?.record?.id || "",
        signUrl: signToken ? `${baseUrl}/resign/${signToken}` : "",
      });
      setReport(null);
    } catch (err: unknown) {
      setSendError(err instanceof Error ? err.message : "Failed to send letter");
    } finally {
      setSending(false);
    }
  };

  const closeModal = () => {
    setShowModal(false);
    setSent(null);
    setReport(null);
    setSendError(null);
  };

  return (
    <div className="space-y-4">
      <div className="flex items-center justify-between">
        <p className="text-sm font-semibold text-fg">Director resignations</p>
        <button
          onClick={openModal}
          className="px-4 py-2 bg-accent text-accent-on rounded font-semibold text-sm hover:opacity-90 transition-opacity"
        >
          Letter of Resignation
        </button>
      </div>

      {showModal && (
        <div
          className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm p-4"
          onClick={(e) => { if (e.target === e.currentTarget) closeModal(); }}
        >
          <div className="bg-surface border border-border rounded-xl shadow-2xl w-full max-w-md flex flex-col max-h-[90vh]">
            <div className="border-b border-border px-6 py-4 flex-shrink-0">
              <h2 className="text-lg font-semibold text-fg">Send Letter of Resignation</h2>
              <p className="text-sm text-muted mt-0.5">
                {sent ? "Letter sent — share the sign link with the director." :
                 report ? "Review the recipient list before sending." :
                 "Select a company and director to send the resignation letter for signature."}
              </p>
            </div>

            <div className="p-6 space-y-4 overflow-y-auto flex-1">
              {sent ? (
                <div className="space-y-3">
                  <p className="text-sm text-fg font-semibold">Letter sent successfully.</p>
                  {sent.signUrl && (
                    <>
                      <p className="text-sm text-muted">Share this link with the director to sign:</p>
                      <div className="flex gap-2">
                        <input readOnly className="flex-1 bg-surface border border-border rounded px-3 py-2 text-sm text-fg font-mono" value={sent.signUrl} />
                        <button
                          onClick={() => {
                            const el = document.createElement("textarea");
                            el.value = sent.signUrl;
                            el.style.position = "fixed"; el.style.opacity = "0";
                            document.body.appendChild(el); el.focus(); el.select();
                            document.execCommand("copy");
                            document.body.removeChild(el);
                          }}
                          className="px-4 py-2 bg-accent text-accent-on rounded font-semibold text-sm flex-shrink-0"
                        >
                          Copy
                        </button>
                      </div>
                    </>
                  )}
                </div>
              ) : (
                <>
                  <div className="grid grid-cols-2 gap-3">
                    <SearchableSelect
                      id="res-company"
                      label="Company"
                      collection="ysterbaard_companies"
                      fields={["id", "enterprise_name", "company_email", "enterprise_no"]}
                      searchFields={["enterprise_name", "enterprise_no"]}
                      placeholder="Search companies..."
                      value={selectedCompany?.id ?? ""}
                      onChange={(r) => { setSelectedCompany(r as CompanyRow | null); setReport(null); }}
                      renderLabel={(r) => (r.enterprise_name as string) || (r.id as string)}
                      renderSub={(r) => (r.enterprise_no as string) || (r.company_email as string) || ""}
                      required
                    />
                    <SearchableSelect
                      id="res-director"
                      label="Director"
                      collection="ysterbaard_directors"
                      fields={["id", "first_names", "surname", "email", "telephone", "id_no"]}
                      searchFields={["first_names", "surname", "id_no"]}
                      placeholder="Search directors..."
                      value={selectedDirector?.id ?? ""}
                      onChange={(r) => { setSelectedDirector(r as DirectorRow | null); setReport(null); }}
                      renderLabel={(r) => [r.first_names as string, r.surname as string].filter(Boolean).join(" ") || (r.id as string)}
                      renderSub={(r) => (r.email as string) || (r.telephone as string) || (r.id_no as string) || ""}
                      required
                    />
                  </div>

                  {sendError && <p className="text-danger text-sm">{sendError}</p>}

                  {report && (
                    <div className="border border-border rounded-lg p-3 space-y-2 bg-surface-warm/40">
                      <p className="text-xs font-semibold text-muted uppercase tracking-wide">Recipients</p>
                      {report.recipients.map((r) => (
                        <div key={r.key} className="flex items-center gap-2 text-sm">
                          <StatusDot status={r.status} />
                          <span className="text-fg">{r.label}</span>
                          <span className="text-muted font-mono text-xs truncate">
                            {r.email || "(no email)"}
                          </span>
                        </div>
                      ))}
                      {report.problems > 0 && (
                        <p className="text-xs text-amber-700 mt-1">
                          ⚠ {report.problems} recipient(s) missing or invalid email.
                        </p>
                      )}
                    </div>
                  )}
                </>
              )}
            </div>

            <div className="border-t border-border px-6 py-4 flex justify-end gap-3">
              {sent ? (
                <button onClick={closeModal} className="px-4 py-2 bg-accent text-accent-on rounded font-semibold text-sm hover:opacity-90 transition-opacity">
                  Done
                </button>
              ) : report ? (
                <>
                  <button onClick={() => setReport(null)} disabled={sending} className="px-4 py-2 text-sm font-semibold text-muted hover:text-fg transition-colors">Edit</button>
                  <button
                    onClick={() => handleSend(report.problems === 0)}
                    disabled={sending}
                    className="px-4 py-2 bg-accent text-accent-on rounded font-semibold text-sm disabled:opacity-40 hover:opacity-90 transition-opacity"
                  >
                    {report.problems === 0 ? (sending ? "Sending..." : "Send") : (sending ? "Sending..." : "Send anyway")}
                  </button>
                </>
              ) : (
                <>
                  <button onClick={closeModal} className="px-4 py-2 text-sm font-semibold text-muted hover:text-fg transition-colors">Cancel</button>
                  <button
                    onClick={handlePreview}
                    disabled={!selectedDirector || !selectedCompany || previewing}
                    className="px-4 py-2 bg-accent text-accent-on rounded font-semibold text-sm disabled:opacity-40 hover:opacity-90 transition-opacity"
                  >
                    {previewing ? "Validating..." : "Continue"}
                  </button>
                </>
              )}
            </div>
          </div>
        </div>
      )}
    </div>
  );
}