'use client';

import { ArrowLeft, Wrench, LayoutGrid, GitFork, ExternalLink, BadgeCheck } from 'lucide-react';
import { useRouter } from 'next/navigation';
import { ForkButton } from './ForkButton';
import type { MarketplaceTemplate } from '@mcpengine/ai-pipeline/types';

const CATEGORY_COLORS: Record<string, string> = {
  CRM: 'bg-blue-600',
  eCommerce: 'bg-emerald-600',
  HR: 'bg-violet-600',
  Finance: 'bg-amber-600',
  Marketing: 'bg-pink-600',
  Support: 'bg-teal-600',
  ProjectMgmt: 'bg-orange-600',
  Scheduling: 'bg-cyan-600',
  Analytics: 'bg-rose-600',
  DevTools: 'bg-lime-600',
  Social: 'bg-fuchsia-600',
  Communication: 'bg-sky-600',
  Storage: 'bg-indigo-600',
  'AI/ML': 'bg-purple-600',
};

interface ToolInfo {
  name: string;
  description?: string | null;
  groupName?: string | null;
  inputSchema?: { properties?: Record<string, unknown>; required?: string[] } | null;
}

interface TemplateDetailData extends MarketplaceTemplate {
  tools?: ToolInfo[];
  readme?: string;
  relatedTemplates?: MarketplaceTemplate[];
}

interface TemplateDetailProps {
  template: TemplateDetailData;
}

function getMethodFromToolName(name: string): string {
  const lower = name.toLowerCase();
  if (lower.startsWith('create') || lower.startsWith('add') || lower.startsWith('post')) return 'POST';
  if (lower.startsWith('update') || lower.startsWith('edit') || lower.startsWith('patch')) return 'PATCH';
  if (lower.startsWith('delete') || lower.startsWith('remove')) return 'DELETE';
  if (lower.startsWith('list') || lower.startsWith('get') || lower.startsWith('search') || lower.startsWith('fetch')) return 'GET';
  return 'GET';
}

const METHOD_COLORS: Record<string, string> = {
  GET: 'bg-emerald-500/20 text-emerald-400',
  POST: 'bg-blue-500/20 text-blue-400',
  PUT: 'bg-amber-500/20 text-amber-400',
  PATCH: 'bg-orange-500/20 text-orange-400',
  DELETE: 'bg-red-500/20 text-red-400',
};

export function TemplateDetail({ template }: TemplateDetailProps) {
  const router = useRouter();
  const catColor = CATEGORY_COLORS[template.category] || 'bg-gray-600';

  return (
    <div className="max-w-4xl mx-auto">
      {/* Back button */}
      <button
        onClick={() => router.push('/marketplace')}
        className="flex items-center gap-2 text-sm text-gray-400 hover:text-gray-200
                   transition-colors mb-6"
      >
        <ArrowLeft className="h-4 w-4" />
        Back to Marketplace
      </button>

      {/* Header */}
      <div className="flex items-start gap-5 mb-8">
        <div
          className={`
            flex-shrink-0 w-16 h-16 rounded-2xl flex items-center justify-center
            text-white font-bold text-2xl ${catColor}
          `}
        >
          {template.name.charAt(0).toUpperCase()}
        </div>
        <div className="flex-1 min-w-0">
          <div className="flex items-center gap-3 mb-1">
            <h1 className="text-2xl font-bold text-white truncate">
              {template.name}
            </h1>
            {template.isOfficial && (
              <span className="flex items-center gap-1 text-xs font-medium text-indigo-400
                             bg-indigo-500/10 px-2.5 py-0.5 rounded-full">
                <BadgeCheck className="h-3.5 w-3.5" />
                Official
              </span>
            )}
          </div>
          <div className="flex items-center gap-3">
            <span className={`text-xs px-2.5 py-0.5 rounded-full text-white ${catColor}`}>
              {template.category}
            </span>
            <span className="text-sm text-gray-400">
              by {template.author?.name || 'Anonymous'}
            </span>
          </div>
        </div>
      </div>

      {/* Description */}
      <p className="text-gray-300 text-base leading-relaxed mb-6">
        {template.description || 'No description provided.'}
      </p>

      {/* Stats row */}
      <div className="flex items-center gap-6 mb-8 pb-6 border-b border-gray-800">
        <div className="flex items-center gap-2 text-sm">
          <Wrench className="h-4 w-4 text-gray-500" />
          <span className="text-gray-300 font-medium">{template.toolCount}</span>
          <span className="text-gray-500">tools</span>
        </div>
        <div className="flex items-center gap-2 text-sm">
          <LayoutGrid className="h-4 w-4 text-gray-500" />
          <span className="text-gray-300 font-medium">{template.appCount}</span>
          <span className="text-gray-500">apps</span>
        </div>
        <div className="flex items-center gap-2 text-sm">
          <GitFork className="h-4 w-4 text-gray-500" />
          <span className="text-gray-300 font-medium">{template.forkCount}</span>
          <span className="text-gray-500">forks</span>
        </div>
      </div>

      {/* Action buttons */}
      <div className="flex items-center gap-3 mb-10">
        <ForkButton templateId={template.id} />
        <button
          onClick={() => window.open(`/api/marketplace/${template.id}`, '_blank')}
          className="inline-flex items-center gap-2 px-5 py-2.5 rounded-lg
                     font-medium text-sm transition-all duration-200
                     bg-gray-800 text-gray-300 border border-gray-700
                     hover:bg-gray-700 hover:text-white"
        >
          <ExternalLink className="h-4 w-4" />
          View Source
        </button>
      </div>

      {/* Tools section */}
      {template.tools && template.tools.length > 0 && (
        <div className="mb-10">
          <h2 className="text-lg font-semibold text-white mb-4">
            Tools ({template.tools.length})
          </h2>
          <div className="space-y-2">
            {template.tools.map((tool, i) => {
              const method = getMethodFromToolName(tool.name);
              return (
                <div
                  key={i}
                  className="flex items-center gap-3 p-3 rounded-lg bg-gray-800/50 border border-gray-800"
                >
                  <span
                    className={`
                      flex-shrink-0 px-2 py-0.5 rounded text-xs font-mono font-bold
                      ${METHOD_COLORS[method] || METHOD_COLORS.GET}
                    `}
                  >
                    {method}
                  </span>
                  <span className="font-medium text-gray-200 text-sm">{tool.name}</span>
                  <span className="text-sm text-gray-500 truncate flex-1">
                    {tool.description || ''}
                  </span>
                </div>
              );
            })}
          </div>
        </div>
      )}

      {/* README section */}
      {template.readme && (
        <div className="mb-10">
          <h2 className="text-lg font-semibold text-white mb-4">README</h2>
          <div
            className="prose prose-invert prose-sm max-w-none p-6 rounded-xl bg-gray-800/50 border border-gray-800"
            dangerouslySetInnerHTML={{ __html: template.readme }}
          />
        </div>
      )}

      {/* Related templates */}
      {template.relatedTemplates && template.relatedTemplates.length > 0 && (
        <div className="mb-10">
          <h2 className="text-lg font-semibold text-white mb-4">Related Templates</h2>
          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
            {template.relatedTemplates.map((related) => (
              <div
                key={related.id}
                onClick={() => router.push(`/marketplace/${related.id}`)}
                className="p-4 rounded-lg bg-gray-800/50 border border-gray-800
                           cursor-pointer hover:border-gray-600 transition-all"
              >
                <div className="flex items-center gap-2 mb-2">
                  <div
                    className={`
                      w-8 h-8 rounded-lg flex items-center justify-center
                      text-white font-bold text-xs
                      ${CATEGORY_COLORS[related.category] || 'bg-gray-600'}
                    `}
                  >
                    {related.name.charAt(0).toUpperCase()}
                  </div>
                  <span className="font-medium text-gray-200 text-sm truncate">
                    {related.name}
                  </span>
                </div>
                <p className="text-xs text-gray-500 line-clamp-2">{related.description}</p>
              </div>
            ))}
          </div>
        </div>
      )}
    </div>
  );
}