/**
 * ApiKeysPanel — grid of saved API keys with add button and empty state.
 */

import { useEffect, useState } from 'react';

import { Button } from '@renderer/components/ui/button';
import { Tooltip, TooltipContent, TooltipTrigger } from '@renderer/components/ui/tooltip';
import { useStore } from '@renderer/store';
import { useShallow } from 'zustand/react/shallow';
import { AlertTriangle, Info, Key, Plus } from 'lucide-react';

import { ApiKeyCard } from './ApiKeyCard';
import { ApiKeyFormDialog } from './ApiKeyFormDialog';

import type { ApiKeyEntry } from '@shared/types/extensions';

export const ApiKeysPanel = (): React.JSX.Element => {
  const { apiKeys, apiKeysLoading, apiKeysError, storageStatus, fetchStorageStatus } = useStore(
    useShallow((s) => ({
      apiKeys: s.apiKeys,
      apiKeysLoading: s.apiKeysLoading,
      apiKeysError: s.apiKeysError,
      storageStatus: s.apiKeyStorageStatus,
      fetchStorageStatus: s.fetchApiKeyStorageStatus,
    }))
  );

  const [dialogOpen, setDialogOpen] = useState(false);
  const [editingKey, setEditingKey] = useState<ApiKeyEntry | null>(null);

  useEffect(() => {
    void fetchStorageStatus();
  }, [fetchStorageStatus]);

  const handleAdd = () => {
    setEditingKey(null);
    setDialogOpen(true);
  };

  const handleEdit = (key: ApiKeyEntry) => {
    setEditingKey(key);
    setDialogOpen(true);
  };

  const handleDialogClose = () => {
    setDialogOpen(false);
    setEditingKey(null);
  };

  const isOsKeychain = storageStatus?.encryptionMethod === 'os-keychain';

  return (
    <div className="flex flex-col gap-4">
      {/* Header row */}
      <div className="flex items-center justify-between">
        <p className="flex items-center gap-1.5 text-sm text-text-secondary">
          Securely store API keys for auto-filling when installing MCP servers.
          {storageStatus && (
            <Tooltip>
              <TooltipTrigger asChild>
                {isOsKeychain ? (
                  <Info className="size-3.5 shrink-0 cursor-help text-text-muted" />
                ) : (
                  <AlertTriangle className="size-3.5 shrink-0 cursor-help text-amber-400" />
                )}
              </TooltipTrigger>
              <TooltipContent side="bottom" className="max-w-xs">
                {isOsKeychain ? (
                  <p>
                    Keys are encrypted via {storageStatus.backend} and stored with restricted file
                    permissions (owner-only).
                  </p>
                ) : (
                  <p>
                    OS keychain unavailable — keys are encrypted locally with AES-256. For stronger
                    protection, install a keyring service (gnome-keyring, kwallet).
                  </p>
                )}
              </TooltipContent>
            </Tooltip>
          )}
        </p>
        <Button variant="outline" size="sm" onClick={handleAdd} className="gap-1.5">
          <Plus className="size-3.5" />
          Add API Key
        </Button>
      </div>

      {/* Error */}
      {apiKeysError && (
        <div className="rounded-md border border-red-500/30 bg-red-500/5 p-4 text-sm text-red-400">
          {apiKeysError}
        </div>
      )}

      {/* Skeleton loading */}
      {apiKeysLoading && apiKeys.length === 0 && (
        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 xl:grid-cols-3">
          {Array.from({ length: 3 }, (_, i) => (
            <div
              key={i}
              className="skeleton-card flex flex-col gap-2 rounded-lg border border-border p-4"
              style={{ animationDelay: `${i * 80}ms` }}
            >
              <div className="h-4 w-32 rounded bg-surface-raised" />
              <div className="h-3 w-24 rounded bg-surface-raised" />
              <div className="h-3 w-40 rounded bg-surface-raised" />
            </div>
          ))}
        </div>
      )}

      {/* Empty state */}
      {!apiKeysLoading && apiKeys.length === 0 && (
        <div className="flex flex-col items-center gap-3 rounded-sm border border-dashed border-border px-8 py-16">
          <div className="flex size-10 items-center justify-center rounded-lg border border-border bg-surface-raised">
            <Key className="size-5 text-text-muted" />
          </div>
          <p className="text-sm text-text-secondary">No API keys saved</p>
          <p className="text-xs text-text-muted">
            Add keys to auto-fill environment variables when installing MCP servers.
          </p>
          <Button variant="outline" size="sm" onClick={handleAdd} className="mt-2 gap-1.5">
            <Plus className="size-3.5" />
            Add your first key
          </Button>
        </div>
      )}

      {/* Key cards grid */}
      {apiKeys.length > 0 && (
        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 xl:grid-cols-3">
          {apiKeys.map((key) => (
            <ApiKeyCard key={key.id} apiKey={key} onEdit={handleEdit} />
          ))}
        </div>
      )}

      {/* Form dialog */}
      <ApiKeyFormDialog open={dialogOpen} editingKey={editingKey} onClose={handleDialogClose} />
    </div>
  );
};