import { useState } from "react";
import { useTranslation } from "react-i18next";
import { changeMyPassword, updateMyProfile, type SessionUser } from "./api.js";

// Self-service profile: the signed-in user edits their OWN display name + email and
// changes their OWN password (proving the current one). This is NOT the admin
// user-manager (UsersManager.tsx) — it never touches another account, username, or
// role, and needs no `user:*` permission. See routes/auth.ts (/api/auth/profile,
// /api/auth/password) and wiki/entities/local-jwt-auth.md.

const MIN_PASSWORD = 8;

export function Profile({
  user,
  setUser,
}: {
  user: SessionUser;
  setUser: (u: SessionUser | null) => void;
}) {
  const { t } = useTranslation();

  // --- Account (name / email) ---
  const [fullName, setFullName] = useState(user.fullName ?? "");
  const [email, setEmail] = useState(user.email ?? "");
  const [accountMsg, setAccountMsg] = useState<string | null>(null);
  const [savingAccount, setSavingAccount] = useState(false);

  async function saveAccount() {
    setAccountMsg(null);
    setSavingAccount(true);
    try {
      const next = await updateMyProfile({ fullName, email });
      // Keep the router-context user in sync so the header reflects the change.
      setUser(next);
      setFullName(next.fullName ?? "");
      setEmail(next.email ?? "");
      setAccountMsg(t("profile.profileSaved"));
    } catch (e) {
      setAccountMsg((e as Error).message);
    } finally {
      setSavingAccount(false);
    }
  }

  // --- Password ---
  const [current, setCurrent] = useState("");
  const [next, setNext] = useState("");
  const [confirm, setConfirm] = useState("");
  const [pwMsg, setPwMsg] = useState<string | null>(null);
  const [savingPw, setSavingPw] = useState(false);

  async function changePassword() {
    setPwMsg(null);
    if (next.length < MIN_PASSWORD) {
      setPwMsg(t("profile.passwordTooShort", { min: MIN_PASSWORD }));
      return;
    }
    if (next !== confirm) {
      setPwMsg(t("profile.passwordsDontMatch"));
      return;
    }
    setSavingPw(true);
    try {
      await changeMyPassword(current, next);
      setCurrent("");
      setNext("");
      setConfirm("");
      setPwMsg(t("profile.passwordChanged"));
    } catch (e) {
      setPwMsg((e as Error).message);
    } finally {
      setSavingPw(false);
    }
  }

  return (
    <div className="mx-auto flex max-w-xl flex-col gap-6">
      <h1 className="text-lg text-term-text">{t("profile.title")}</h1>

      {/* Account: display name + email (username + role are read-only — admin-managed). */}
      <section className="card flex flex-col gap-3 p-4">
        <h2 className="text-sm uppercase tracking-wider text-term-muted">
          {t("profile.accountSection")}
        </h2>
        <div className="grid grid-cols-2 gap-3 text-[0.6875rem] text-term-muted">
          <div>
            <span className="block">{t("profile.username")}</span>
            <span className="text-sm text-term-text">{user.username}</span>
          </div>
          <div>
            <span className="block">{t("profile.role")}</span>
            <span className="text-sm text-term-text">{user.roleName}</span>
          </div>
        </div>
        <label className="flex flex-col gap-1 text-[0.6875rem] text-term-muted">
          {t("profile.fullName")}
          <input
            className="input"
            value={fullName}
            placeholder={t("profile.fullNamePh")}
            onChange={(e) => setFullName(e.target.value)}
          />
        </label>
        <label className="flex flex-col gap-1 text-[0.6875rem] text-term-muted">
          {t("profile.email")}
          <input
            className="input"
            type="email"
            value={email}
            placeholder={t("profile.emailPh")}
            onChange={(e) => setEmail(e.target.value)}
          />
        </label>
        <div className="flex items-center gap-3">
          <button type="button" className="btn btn-primary btn-sm" onClick={saveAccount} disabled={savingAccount}>
            {t("profile.saveProfile")}
          </button>
          {accountMsg && <span className="text-[0.6875rem] text-term-muted">{accountMsg}</span>}
        </div>
      </section>

      {/* Password: requires the current one (server enforces). */}
      <section className="card flex flex-col gap-3 p-4">
        <h2 className="text-sm uppercase tracking-wider text-term-muted">
          {t("profile.passwordSection")}
        </h2>
        <label className="flex flex-col gap-1 text-[0.6875rem] text-term-muted">
          {t("profile.currentPassword")}
          <input
            className="input"
            type="password"
            autoComplete="current-password"
            value={current}
            onChange={(e) => setCurrent(e.target.value)}
          />
        </label>
        <label className="flex flex-col gap-1 text-[0.6875rem] text-term-muted">
          {t("profile.newPassword")}
          <input
            className="input"
            type="password"
            autoComplete="new-password"
            value={next}
            onChange={(e) => setNext(e.target.value)}
          />
        </label>
        <label className="flex flex-col gap-1 text-[0.6875rem] text-term-muted">
          {t("profile.confirmPassword")}
          <input
            className="input"
            type="password"
            autoComplete="new-password"
            value={confirm}
            onChange={(e) => setConfirm(e.target.value)}
          />
        </label>
        <div className="flex items-center gap-3">
          <button
            type="button"
            className="btn btn-primary btn-sm"
            onClick={changePassword}
            disabled={savingPw || !current || !next || !confirm}
          >
            {t("profile.changePassword")}
          </button>
          {pwMsg && <span className="text-[0.6875rem] text-term-muted">{pwMsg}</span>}
        </div>
      </section>
    </div>
  );
}