"use client";

import { useState, useTransition } from "react";
import { FormField, inputCls, selectCls } from "@/components/admin/FormField";
import {
  savePlatformSettingsAction,
  saveStripeSettingsAction,
  saveThemeSettingsAction,
} from "../actions";

type Action = (fd: FormData) => Promise<{ ok: false; error: string } | { ok: true } | undefined>;

function FormWrapper({
  action,
  children,
  submitLabel = "Enregistrer",
}: {
  action: Action;
  children: React.ReactNode;
  submitLabel?: string;
}) {
  const [pending, startTransition] = useTransition();
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState<string | null>(null);

  function onSubmit(fd: FormData) {
    setError(null);
    setSuccess(null);
    startTransition(async () => {
      const res = await action(fd);
      if (res && res.ok === false) setError(res.error);
      else if (res && res.ok === true) setSuccess("Enregistré.");
    });
  }

  return (
    <form action={onSubmit} className="space-y-4">
      <fieldset disabled={pending} className="space-y-4">
        {children}
        {error ? (
          <div className="rounded border border-rose-200 bg-rose-50 px-3 py-2 text-sm text-rose-700">{error}</div>
        ) : null}
        {success ? (
          <div className="rounded border border-emerald-200 bg-emerald-50 px-3 py-2 text-sm text-emerald-800">{success}</div>
        ) : null}
        <div className="flex items-center justify-end">
          <button
            type="submit"
            className="rounded-md bg-zinc-900 px-5 py-2 text-sm font-semibold text-white hover:bg-zinc-800 disabled:opacity-50"
          >
            {pending ? "Enregistrement…" : submitLabel}
          </button>
        </div>
      </fieldset>
    </form>
  );
}

export function PlatformForm({
  initial,
}: {
  initial: { name: string; defaultLang: string; activeLangs: string[]; currency: string; commissionPercent: number };
}) {
  return (
    <FormWrapper action={savePlatformSettingsAction}>
      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
        <FormField label="Nom de la plateforme" required>
          <input name="name" defaultValue={initial.name} required maxLength={80} className={inputCls} />
        </FormField>
        <FormField label="Devise (ISO 4217)" required hint="EUR, USD, BRL…">
          <input
            name="currency"
            defaultValue={initial.currency}
            required
            pattern="^[A-Z]{3}$"
            maxLength={3}
            className={inputCls + " uppercase"}
          />
        </FormField>
        <FormField label="Langue par défaut" required hint="Code ISO 639-1 (fr, en, pt…)">
          <input
            name="defaultLang"
            defaultValue={initial.defaultLang}
            required
            pattern="^[a-zA-Z]{2}$"
            maxLength={2}
            className={inputCls + " lowercase"}
          />
        </FormField>
        <FormField label="Langues actives" required hint="Séparées par virgule (fr, en, pt).">
          <input
            name="activeLangs"
            defaultValue={initial.activeLangs.join(", ")}
            required
            className={inputCls + " lowercase"}
            placeholder="fr, en"
          />
        </FormField>
        <FormField label="Commission plateforme (%)" hint="Affiché dans les CGV. 0 = pas de commission.">
          <input
            name="commissionPercent"
            type="number"
            min={0}
            max={100}
            step="0.01"
            defaultValue={initial.commissionPercent.toString()}
            className={inputCls}
          />
        </FormField>
      </div>
    </FormWrapper>
  );
}

export function ThemeForm({ initial }: { initial: { active: string } }) {
  return (
    <FormWrapper action={saveThemeSettingsAction}>
      <FormField label="Thème actif" hint="Détermine la skin du site public.">
        <select name="active" defaultValue={initial.active} className={selectCls}>
          <option value="default">default — sobre (admin-like)</option>
          <option value="theme-aquarelle">theme-aquarelle — carnet naturaliste XIXᵉ</option>
          <option value="theme-guyane">theme-guyane — palette tropicale</option>
        </select>
      </FormField>
    </FormWrapper>
  );
}

export function StripeForm({
  initial,
}: {
  initial: { currency: string; commissionMode: string; perBookingFeePercent: number };
}) {
  return (
    <FormWrapper action={saveStripeSettingsAction}>
      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
        <FormField label="Devise Stripe" required hint="Doit correspondre à la devise plateforme.">
          <input
            name="currency"
            defaultValue={initial.currency}
            required
            pattern="^[A-Z]{3}$"
            maxLength={3}
            className={inputCls + " uppercase"}
          />
        </FormField>
        <FormField label="Modèle économique" required>
          <select name="commissionMode" defaultValue={initial.commissionMode} className={selectCls}>
            <option value="none">Aucune monétisation (preview)</option>
            <option value="owner-subscription">Abonnement loueur (revenu plateforme)</option>
            <option value="per-booking">Commission par réservation</option>
          </select>
        </FormField>
        <FormField
          label="Commission par réservation (%)"
          hint="Utilisé uniquement si modèle = par réservation."
        >
          <input
            name="perBookingFeePercent"
            type="number"
            min={0}
            max={100}
            step="0.01"
            defaultValue={initial.perBookingFeePercent.toString()}
            className={inputCls}
          />
        </FormField>
      </div>
    </FormWrapper>
  );
}