'use client';

import { useState } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { listApiKeys, createApiKey, revokeApiKey } from '@/lib/api/api-keys';
import type { ApiKeyDto, CreateApiKeyResultDto } from '@/lib/api/api-keys';
import { useSubscription } from '@/lib/context/subscription-context';
import {
  Key,
  Plus,
  Trash2,
  Copy,
  Check,
  AlertTriangle,
  Clock,
  X,
  ShieldCheck,
  Lock,
} from 'lucide-react';

// ─── Helpers ────────────────────────────────────────────────────────────────

function formatDate(iso: string | null): string {
  if (!iso) return '—';
  return new Intl.DateTimeFormat('fr-FR', { dateStyle: 'medium' }).format(new Date(iso));
}

function keyStatusBadge(key: ApiKeyDto) {
  if (!key.isActive) {
    return (
      <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-xs font-medium bg-gray-100 text-gray-600">
        Révoquée
      </span>
    );
  }
  if (key.expiresAt && new Date(key.expiresAt) < new Date()) {
    return (
      <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-xs font-medium bg-amber-100 text-amber-700">
        <Clock className="w-3 h-3" />
        Expirée
      </span>
    );
  }
  return (
    <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-xs font-medium bg-green-100 text-green-700">
      Active
    </span>
  );
}

// ─── Copy button ─────────────────────────────────────────────────────────────

function CopyButton({ text }: { text: string }) {
  const [copied, setCopied] = useState(false);
  const handleCopy = async () => {
    await navigator.clipboard.writeText(text);
    setCopied(true);
    setTimeout(() => setCopied(false), 2000);
  };
  return (
    <button
      onClick={handleCopy}
      className="flex items-center gap-1.5 px-3 py-1.5 text-xs font-medium rounded-lg border border-gray-200 hover:bg-gray-50 transition-colors"
    >
      {copied ? (
        <>
          <Check className="w-3.5 h-3.5 text-green-500" />
          <span className="text-green-600">Copié</span>
        </>
      ) : (
        <>
          <Copy className="w-3.5 h-3.5 text-gray-400" />
          <span className="text-gray-600">Copier</span>
        </>
      )}
    </button>
  );
}

// ─── Creation success modal ──────────────────────────────────────────────────

function CreatedKeyModal({
  result,
  onClose,
}: {
  result: CreateApiKeyResultDto;
  onClose: () => void;
}) {
  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm p-4">
      <div className="bg-white rounded-2xl shadow-xl w-full max-w-lg">
        {/* Header */}
        <div className="flex items-center justify-between p-6 border-b">
          <div className="flex items-center gap-3">
            <div className="w-10 h-10 rounded-xl bg-green-100 flex items-center justify-center">
              <ShieldCheck className="w-5 h-5 text-green-600" />
            </div>
            <div>
              <h2 className="text-lg font-semibold text-gray-900">Clé API créée</h2>
              <p className="text-sm text-gray-500">{result.name}</p>
            </div>
          </div>
          <button onClick={onClose} className="text-gray-400 hover:text-gray-600 transition-colors">
            <X className="w-5 h-5" />
          </button>
        </div>

        {/* Warning */}
        <div className="mx-6 mt-6 p-4 bg-amber-50 border border-amber-200 rounded-xl flex gap-3">
          <AlertTriangle className="w-5 h-5 text-amber-600 flex-shrink-0 mt-0.5" />
          <p className="text-sm text-amber-800">
            <strong>Copiez cette clé maintenant.</strong> Elle ne sera plus jamais affichée après
            la fermeture de cette fenêtre.
          </p>
        </div>

        {/* Key */}
        <div className="p-6">
          <label className="block text-xs font-medium text-gray-500 mb-2 uppercase tracking-wide">
            Clé API complète
          </label>
          <div className="flex items-center gap-2 p-3 bg-gray-950 rounded-xl border border-gray-800">
            <code className="flex-1 text-xs font-mono text-green-400 break-all">
              {result.fullKey}
            </code>
            <CopyButton text={result.fullKey} />
          </div>
          <p className="mt-3 text-xs text-gray-500">
            Stockez-la dans vos variables d&apos;environnement ou un gestionnaire de secrets.
          </p>
        </div>

        {/* Footer */}
        <div className="p-6 pt-0">
          <button
            onClick={onClose}
            className="w-full py-2.5 bg-[#10183A] hover:bg-[#1a2550] text-white text-sm font-medium rounded-xl transition-colors"
          >
            J&apos;ai copié ma clé, fermer
          </button>
        </div>
      </div>
    </div>
  );
}

// ─── Create key form modal ───────────────────────────────────────────────────

function CreateKeyModal({
  onSuccess,
  onClose,
}: {
  onSuccess: (result: CreateApiKeyResultDto) => void;
  onClose: () => void;
}) {
  const [name, setName] = useState('');
  const [expiresAt, setExpiresAt] = useState('');
  const queryClient = useQueryClient();

  const mutation = useMutation({
    mutationFn: createApiKey,
    onSuccess: result => {
      queryClient.invalidateQueries({ queryKey: ['api-keys'] });
      onSuccess(result);
    },
  });

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    mutation.mutate({
      name: name.trim(),
      ...(expiresAt ? { expiresAt: new Date(expiresAt).toISOString() } : {}),
    });
  };

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm p-4">
      <div className="bg-white rounded-2xl shadow-xl w-full max-w-md">
        {/* Header */}
        <div className="flex items-center justify-between p-6 border-b">
          <div className="flex items-center gap-3">
            <div className="w-10 h-10 rounded-xl bg-blue-100 flex items-center justify-center">
              <Key className="w-5 h-5 text-blue-600" />
            </div>
            <h2 className="text-lg font-semibold text-gray-900">Nouvelle clé API</h2>
          </div>
          <button onClick={onClose} className="text-gray-400 hover:text-gray-600 transition-colors">
            <X className="w-5 h-5" />
          </button>
        </div>

        <form onSubmit={handleSubmit} className="p-6 space-y-5">
          {/* Name */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1.5">
              Nom de la clé <span className="text-red-500">*</span>
            </label>
            <input
              type="text"
              value={name}
              onChange={e => setName(e.target.value)}
              placeholder="ex: Intégration ERP Production"
              maxLength={100}
              required
              className="w-full px-3.5 py-2.5 border border-gray-200 rounded-xl text-sm focus:outline-none focus:ring-2 focus:ring-[#34CCCD] focus:border-transparent"
            />
            <p className="mt-1 text-xs text-gray-400">{name.length}/100 caractères</p>
          </div>

          {/* Expiry */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1.5">
              Date d&apos;expiration{' '}
              <span className="text-gray-400 font-normal">(optionnel)</span>
            </label>
            <input
              type="date"
              value={expiresAt}
              onChange={e => setExpiresAt(e.target.value)}
              min={new Date().toISOString().split('T')[0]}
              className="w-full px-3.5 py-2.5 border border-gray-200 rounded-xl text-sm focus:outline-none focus:ring-2 focus:ring-[#34CCCD] focus:border-transparent"
            />
            <p className="mt-1 text-xs text-gray-400">
              Si vide, la clé n&apos;expire jamais.
            </p>
          </div>

          {/* Error */}
          {mutation.isError && (
            <div className="flex items-center gap-2 p-3 bg-red-50 border border-red-200 rounded-xl text-sm text-red-700">
              <AlertTriangle className="w-4 h-4 flex-shrink-0" />
              Une erreur est survenue. Veuillez réessayer.
            </div>
          )}

          {/* Actions */}
          <div className="flex gap-3 pt-2">
            <button
              type="button"
              onClick={onClose}
              className="flex-1 py-2.5 border border-gray-200 text-gray-700 text-sm font-medium rounded-xl hover:bg-gray-50 transition-colors"
            >
              Annuler
            </button>
            <button
              type="submit"
              disabled={!name.trim() || mutation.isPending}
              className="flex-1 py-2.5 bg-[#10183A] hover:bg-[#1a2550] disabled:opacity-50 text-white text-sm font-medium rounded-xl transition-colors"
            >
              {mutation.isPending ? 'Création...' : 'Créer la clé'}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}

// ─── Revoke confirm modal ────────────────────────────────────────────────────

function RevokeConfirmModal({
  apiKey,
  onConfirm,
  onClose,
}: {
  apiKey: ApiKeyDto;
  onConfirm: () => void;
  onClose: () => void;
}) {
  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm p-4">
      <div className="bg-white rounded-2xl shadow-xl w-full max-w-md">
        <div className="p-6">
          <div className="w-12 h-12 rounded-xl bg-red-100 flex items-center justify-center mx-auto mb-4">
            <Trash2 className="w-6 h-6 text-red-600" />
          </div>
          <h2 className="text-lg font-semibold text-gray-900 text-center mb-2">
            Révoquer cette clé ?
          </h2>
          <p className="text-sm text-gray-600 text-center mb-1">
            <strong className="text-gray-900">{apiKey.name}</strong>
          </p>
          <p className="text-sm text-gray-500 text-center">
            Cette action est <strong>immédiate et irréversible</strong>. Toute requête utilisant
            cette clé sera refusée.
          </p>
        </div>
        <div className="px-6 pb-6 flex gap-3">
          <button
            onClick={onClose}
            className="flex-1 py-2.5 border border-gray-200 text-gray-700 text-sm font-medium rounded-xl hover:bg-gray-50 transition-colors"
          >
            Annuler
          </button>
          <button
            onClick={onConfirm}
            className="flex-1 py-2.5 bg-red-600 hover:bg-red-700 text-white text-sm font-medium rounded-xl transition-colors"
          >
            Révoquer
          </button>
        </div>
      </div>
    </div>
  );
}

// ─── Main page ────────────────────────────────────────────────────────────────

export default function ApiKeysPage() {
  const { hasFeature } = useSubscription();
  const queryClient = useQueryClient();
  const hasApiAccess = hasFeature('api_access');

  const [showCreateModal, setShowCreateModal] = useState(false);
  const [createdKey, setCreatedKey] = useState<CreateApiKeyResultDto | null>(null);
  const [revokeTarget, setRevokeTarget] = useState<ApiKeyDto | null>(null);

  const { data: apiKeys, isLoading } = useQuery({
    queryKey: ['api-keys'],
    queryFn: listApiKeys,
    enabled: hasApiAccess,
  });

  const revokeMutation = useMutation({
    mutationFn: revokeApiKey,
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['api-keys'] });
      setRevokeTarget(null);
    },
  });

  // Plan upsell screen
  if (!hasApiAccess) {
    return (
      <div className="max-w-lg mx-auto mt-16 text-center">
        <div className="w-16 h-16 rounded-2xl bg-gray-100 flex items-center justify-center mx-auto mb-6">
          <Lock className="w-8 h-8 text-gray-400" />
        </div>
        <h1 className="text-2xl font-bold text-gray-900 mb-3">Accès API</h1>
        <p className="text-gray-600 mb-8">
          L&apos;accès programmatique à l&apos;API Xpeditis est disponible sur les plans{' '}
          <strong>Gold</strong> et <strong>Platinium</strong> uniquement.
        </p>
        <a
          href="/pricing"
          className="inline-flex items-center gap-2 px-6 py-3 bg-[#10183A] hover:bg-[#1a2550] text-white text-sm font-medium rounded-xl transition-colors"
        >
          Voir les plans
        </a>
      </div>
    );
  }

  const activeKeys = apiKeys?.filter(k => k.isActive) ?? [];

  return (
    <>
      {/* Modals */}
      {showCreateModal && (
        <CreateKeyModal
          onSuccess={result => {
            setShowCreateModal(false);
            setCreatedKey(result);
          }}
          onClose={() => setShowCreateModal(false)}
        />
      )}
      {createdKey && (
        <CreatedKeyModal result={createdKey} onClose={() => setCreatedKey(null)} />
      )}
      {revokeTarget && (
        <RevokeConfirmModal
          apiKey={revokeTarget}
          onConfirm={() => revokeMutation.mutate(revokeTarget.id)}
          onClose={() => setRevokeTarget(null)}
        />
      )}

      {/* Page header */}
      <div className="flex items-start justify-between mb-8">
        <div>
          <h1 className="text-2xl font-bold text-gray-900">Clés API</h1>
          <p className="mt-1 text-sm text-gray-500">
            Gérez les clés d&apos;accès programmatique à l&apos;API Xpeditis.
          </p>
        </div>
        <button
          onClick={() => setShowCreateModal(true)}
          disabled={activeKeys.length >= 20}
          className="flex items-center gap-2 px-4 py-2.5 bg-[#10183A] hover:bg-[#1a2550] disabled:opacity-50 text-white text-sm font-medium rounded-xl transition-colors"
        >
          <Plus className="w-4 h-4" />
          Nouvelle clé
        </button>
      </div>

      {/* Info banner */}
      <div className="mb-6 p-4 bg-blue-50 border border-blue-100 rounded-xl flex gap-3">
        <ShieldCheck className="w-5 h-5 text-blue-600 flex-shrink-0 mt-0.5" />
        <div className="text-sm text-blue-800">
          <p className="font-medium mb-0.5">Comment utiliser vos clés API</p>
          <p>
            Ajoutez l&apos;en-tête{' '}
            <code className="px-1.5 py-0.5 bg-blue-100 rounded text-blue-900 font-mono text-xs">
              X-API-Key: xped_live_...
            </code>{' '}
            à chaque requête HTTP.{' '}
            <a
              href="/dashboard/docs?section=authentication"
              className="font-medium underline underline-offset-2"
            >
              Voir la documentation
            </a>
          </p>
        </div>
      </div>

      {/* Keys list */}
      <div className="bg-white border border-gray-200 rounded-2xl overflow-hidden">
        {isLoading ? (
          <div className="flex items-center justify-center py-16">
            <div className="w-8 h-8 border-4 border-[#34CCCD] border-t-transparent rounded-full animate-spin" />
          </div>
        ) : !apiKeys || apiKeys.length === 0 ? (
          <div className="py-16 text-center">
            <Key className="w-10 h-10 text-gray-300 mx-auto mb-3" />
            <p className="text-gray-500 text-sm">Aucune clé API pour le moment.</p>
            <button
              onClick={() => setShowCreateModal(true)}
              className="mt-4 text-sm font-medium text-[#10183A] hover:underline"
            >
              Créer votre première clé
            </button>
          </div>
        ) : (
          <div className="divide-y divide-gray-100">
            {/* Table header */}
            <div className="grid grid-cols-[2fr_1.5fr_1fr_1fr_auto] gap-4 px-6 py-3 bg-gray-50 text-xs font-medium text-gray-500 uppercase tracking-wide">
              <span>Nom / Préfixe</span>
              <span>Dernière utilisation</span>
              <span>Expiration</span>
              <span>Statut</span>
              <span />
            </div>

            {apiKeys.map(key => (
              <div
                key={key.id}
                className="grid grid-cols-[2fr_1.5fr_1fr_1fr_auto] gap-4 items-center px-6 py-4"
              >
                {/* Name + prefix */}
                <div>
                  <p className="text-sm font-medium text-gray-900">{key.name}</p>
                  <code className="text-xs font-mono text-gray-400">{key.keyPrefix}…</code>
                </div>

                {/* Last used */}
                <span className="text-sm text-gray-600">{formatDate(key.lastUsedAt)}</span>

                {/* Expiry */}
                <span className="text-sm text-gray-600">{formatDate(key.expiresAt)}</span>

                {/* Status */}
                <div>{keyStatusBadge(key)}</div>

                {/* Actions */}
                <button
                  onClick={() => setRevokeTarget(key)}
                  disabled={!key.isActive || revokeMutation.isPending}
                  title="Révoquer cette clé"
                  className="p-2 text-gray-400 hover:text-red-600 disabled:opacity-30 disabled:cursor-not-allowed transition-colors rounded-lg hover:bg-red-50"
                >
                  <Trash2 className="w-4 h-4" />
                </button>
              </div>
            ))}
          </div>
        )}
      </div>

      {/* Quota */}
      {apiKeys && apiKeys.length > 0 && (
        <p className="mt-4 text-xs text-gray-400 text-right">
          {activeKeys.length} / 20 clés actives utilisées
        </p>
      )}
    </>
  );
}