'use client';

import { useState, useEffect } from 'react';
import { Zap, Plus, AlertCircle, Clock } from 'lucide-react';
import { useUser } from '@/app/dashboard/useUser';
import { useApiKeys } from './useApiKeys';
import { MAX_API_KEYS, type ApiKey } from './types';
import { ProUpgradePrompt } from './ProUpgradePrompt';
import { ApiKeyTable } from './ApiKeyTable';
import { GenerateKeyDialog } from './GenerateKeyDialog';
import { RevokeKeyDialog } from './RevokeKeyDialog';
import { WebhookSnippet } from './WebhookSnippet';
import { useToast } from '@/components/ui/toast';
import { useI18n } from '@/lib/i18n';
import { cn } from '@/lib/utils';

export default function ApiKeysPage() {
  const { t } = useI18n();
  const { data: user, isLoading: isLoadingUser } = useUser();
  const {
    keys,
    total,
    isLoading: isLoadingKeys,
    isGenerating,
    isRevoking,
    generateKey,
    revokeKey,
    errorDetails,
    parseGenerateError,
    parseRevokeError,
  } = useApiKeys();
  const { toast } = useToast();

  const [generateDialogOpen, setGenerateDialogOpen] = useState(false);
  const [revokeDialogOpen, setRevokeDialogOpen] = useState(false);
  const [keyToRevoke, setKeyToRevoke] = useState<{ id: string; name: string } | null>(null);
  const [apiError, setApiError] = useState<string | null>(null);

  const isPro = user?.tier === 'pro';
  const maxKeysReached = total >= MAX_API_KEYS;
  const isLoading = isLoadingUser || isLoadingKeys;

  // Handle API errors with specific error codes
  useEffect(() => {
    if (errorDetails?.code === 'PRO_FEATURE_REQUIRED') {
      setApiError(null);
    } else if (errorDetails?.code === 'API_KEY_LIMIT_REACHED') {
      setApiError(t('apiKeys.limitReachedDesc'));
    } else if (errorDetails) {
      setApiError(errorDetails.message);
    } else {
      setApiError(null);
    }
  }, [errorDetails]); // eslint-disable-line react-hooks/exhaustive-deps

  const handleRevokeClick = (key: ApiKey) => {
    setKeyToRevoke({ id: key.id, name: key.name });
    setRevokeDialogOpen(true);
  };

  const handleRevokeConfirm = async () => {
    if (!keyToRevoke) return;
    try {
      await revokeKey(keyToRevoke.id);
      setRevokeDialogOpen(false);
      setKeyToRevoke(null);
      toast({
        title: t('apiKeys.keyRevoked'),
        description: t('apiKeys.keyRevokedDesc'),
      });
    } catch (error) {
      const revokeError = parseRevokeError();
      if (revokeError?.code === 'API_KEY_NOT_FOUND') {
        toast({
          variant: 'destructive',
          title: t('apiKeys.keyNotFound'),
          description: t('apiKeys.keyNotFoundDesc'),
        });
      } else {
        toast({
          variant: 'destructive',
          title: t('apiKeys.error'),
          description: revokeError?.message || t('apiKeys.revokeError'),
        });
      }
    }
  };

  const handleGenerateKey = async (name?: string) => {
    try {
      const result = await generateKey(name);
      return result;
    } catch (error) {
      const genError = parseGenerateError();
      if (genError?.code === 'API_KEY_LIMIT_REACHED') {
        toast({
          variant: 'destructive',
          title: t('apiKeys.limitReached'),
          description: t('apiKeys.limitReachedDesc'),
        });
      } else if (genError?.code === 'PRO_FEATURE_REQUIRED') {
        toast({
          variant: 'destructive',
          title: t('apiKeys.proRequired'),
          description: t('apiKeys.proRequiredDesc'),
        });
      } else {
        toast({
          variant: 'destructive',
          title: t('apiKeys.error'),
          description: genError?.message || t('apiKeys.generateError'),
        });
      }
      throw error;
    }
  };

  if (isLoading) {
    return (
      <div className="flex items-center justify-center min-h-[60vh]">
        <div className="text-center space-y-4">
          <div className="animate-spin rounded-full h-8 w-8 border-4 border-brand-muted border-t-brand-accent mx-auto"></div>
          <p className="text-[9px] font-black text-brand-dark/40 dark:text-white/40 uppercase tracking-widest">{t('apiKeys.loading')}</p>
        </div>
      </div>
    );
  }

  if (!isPro) {
    return <ProUpgradePrompt />;
  }

  return (
    <div className="max-w-4xl mx-auto w-full p-6 lg:p-8 space-y-8">
      {/* ── Editorial Header ───────────────────────────────────── */}
      <div className="mb-4">
        <span className="accent-pill mb-4 block w-fit">{t('apiKeys.sectionTitle')}</span>
        <h1 className="text-5xl font-black uppercase tracking-tighter mb-4 leading-none text-brand-dark dark:text-white">
          {t('apiKeys.title')}
        </h1>
        <p className="text-brand-dark/40 dark:text-white/40 font-medium">{t('apiKeys.subtitle')}</p>
      </div>

      {/* API Error */}
      {apiError && (
        <div className="flex items-start gap-3 p-4 rounded-xl border border-red-200 dark:border-red-500/30 bg-red-50 dark:bg-red-500/10 text-sm text-red-600 dark:text-red-400">
          <AlertCircle className="w-4 h-4 shrink-0 mt-0.5" />
          <span className="flex-1">{apiError}</span>
        </div>
      )}

      {/* ── Main Card ──────────────────────────────────────────── */}
      <div className="editorial-card p-10 lg:p-12 bg-white dark:bg-[#141414] border-none shadow-editorial">
        {/* Section header */}
        <div className="flex items-center gap-4 mb-10 text-brand-accent">
          <div className="w-12 h-12 bg-brand-muted dark:bg-white/10 rounded-2xl flex items-center justify-center text-brand-accent">
            <Zap size={24} />
          </div>
          <div>
            <h3 className="text-[11px] font-black uppercase tracking-[0.3em] text-brand-dark dark:text-white">
              {t('apiKeys.sectionTitle')}
            </h3>
            <p className="text-[9px] text-brand-dark/30 dark:text-white/30 font-bold uppercase tracking-widest mt-1">
              {t('apiKeys.sectionDesc')}
            </p>
          </div>
        </div>

        {/* Key count + generate button */}
        <div className="flex items-center justify-between mb-8">
          <div>
            <p className="text-[11px] font-black uppercase tracking-widest text-brand-dark dark:text-white">
              {t('apiKeys.keysUsed', { total, max: MAX_API_KEYS })}
            </p>
            <p className="text-[9px] text-brand-dark/30 dark:text-white/30 font-black uppercase tracking-widest mt-1">
              {maxKeysReached ? (
                <span className="text-amber-600 dark:text-amber-400">{t('apiKeys.maxReached')}</span>
              ) : (
                t(MAX_API_KEYS - total !== 1 ? 'apiKeys.canGeneratePlural' : 'apiKeys.canGenerate', { count: MAX_API_KEYS - total })
              )}
            </p>
          </div>
          <button
            onClick={() => setGenerateDialogOpen(true)}
            disabled={maxKeysReached || isGenerating}
            className="premium-button px-8 py-3 text-[9px] uppercase tracking-widest !rounded-xl flex items-center gap-2 disabled:opacity-50"
          >
            <Plus size={14} />
            {t('apiKeys.generateNew')}
          </button>
        </div>

        {/* Production key display area */}
        <div className="flex items-center justify-between p-8 bg-brand-muted dark:bg-white/5 rounded-3xl border border-black/5 dark:border-white/10 mb-8">
          <div>
            <p className="text-[9px] text-brand-dark/40 dark:text-white/40 font-black uppercase tracking-[0.3em] mb-2">
              {t('apiKeys.sectionTitle')}
            </p>
            <p className="text-sm font-mono text-brand-dark dark:text-white">
              {keys.length > 0 ? `${keys[0].key_prefix}************************************` : t('apiKeys.noKeysGenerated')}
            </p>
          </div>
          <div className="flex gap-3">
            <button className="p-3 bg-white dark:bg-white/10 rounded-xl text-brand-dark/40 dark:text-white/40 hover:text-brand-dark dark:hover:text-white border border-black/5 dark:border-white/10 transition-all">
              <Clock size={16} />
            </button>
          </div>
        </div>

        {/* Key table */}
        <ApiKeyTable
          keys={keys}
          onRevoke={handleRevokeClick}
          isRevoking={isRevoking}
        />
      </div>

      {/* Webhook snippet */}
      <WebhookSnippet />

      {/* Dialogs */}
      <GenerateKeyDialog
        open={generateDialogOpen}
        onOpenChange={setGenerateDialogOpen}
        onGenerate={handleGenerateKey}
        isGenerating={isGenerating}
        maxKeysReached={maxKeysReached}
      />

      <RevokeKeyDialog
        open={revokeDialogOpen}
        onOpenChange={setRevokeDialogOpen}
        onConfirm={handleRevokeConfirm}
        isRevoking={isRevoking}
        keyName={keyToRevoke?.name}
      />
    </div>
  );
}