'use client'

import Link from 'next/link'
import { ArrowLeft } from 'lucide-react'

const skillCategories = [
  {
    title: 'Infrastructure & Orchestration',
    skills: ['Kubernetes (Talos Linux)', 'ArgoCD (GitOps)', 'Terraform (IaC)', 'Kustomize'],
  },
  {
    title: 'Networking & Ingress',
    skills: ['nginx Ingress Controller', 'Cloudflare Tunnel', 'CoreDNS', 'NetworkPolicy'],
  },
  {
    title: 'Storage',
    skills: ['Longhorn (distributed block)', 'MinIO (S3-compatible)'],
  },
  {
    title: 'Databases',
    skills: ['CloudNativePG (PostgreSQL)', 'pgvector (AI embeddings)'],
  },
  {
    title: 'Identity & Security',
    skills: ['Authentik (OIDC SSO)', 'SOPS (encrypted secrets)', 'cert-manager (TLS)'],
  },
  {
    title: 'Observability',
    skills: ['Prometheus', 'Grafana', 'Tempo (tracing)', 'OpenTelemetry', 'Loki (logs)'],
  },
  {
    title: 'CI/CD',
    skills: ['Forgejo (git + Actions)', 'Container Registry', 'DinD Runners'],
  },
  {
    title: 'AI/ML Platform',
    skills: ['vLLM (Qwen3-32B)', 'Ollama', 'TEI (embeddings)', 'KServe'],
  },
  {
    title: 'Workflow & Messaging',
    skills: ['Temporal (durable workflows)', 'Kafka/Redpanda (streaming)'],
  },
  {
    title: 'Languages & Frameworks',
    skills: ['Go (API gateway)', 'Python (ML)', 'Next.js (frontend)'],
  },
]

const coreCompetencies = [
  'Multi-tenant GPU scheduling (sm70/Volta constraints)',
  'Zero-downtime GitOps deployments',
  'Service mesh patterns without Istio overhead',
  'Hybrid cloud networking (Cloudflare + bare-metal)',
  'Declarative IAM with OIDC claim mapping',
]

export default function HomelabPage() {
  return (
    <main className="min-h-screen bg-white dark:bg-gray-950">
      <div className="max-w-4xl mx-auto px-6 py-20">
        <Link 
          href="/#project-homelab" 
          className="inline-flex items-center gap-2 text-blue-600 dark:text-blue-400 hover:underline mb-8"
        >
          <ArrowLeft size={16} />
          Back to Projects
        </Link>

        <h1 className="text-4xl font-bold text-gray-900 dark:text-white mb-4">
          Homelab: Self-Hosted Cloud Platform
        </h1>
        <p className="text-xl text-gray-600 dark:text-gray-400 mb-12">
          AWS rebuilt from scratch at home—full stack from compute to observability.
        </p>

        {/* Stats */}
        <section className="bg-gradient-to-r from-blue-50 to-purple-50 dark:from-gray-800 dark:to-gray-800 rounded-lg p-6 mb-12">
          <div className="grid grid-cols-2 md:grid-cols-4 gap-4 text-center">
            <div>
              <div className="text-2xl font-bold text-blue-600 dark:text-blue-400">4</div>
              <div className="text-sm text-gray-600 dark:text-gray-400">Nodes</div>
            </div>
            <div>
              <div className="text-2xl font-bold text-blue-600 dark:text-blue-400">20+</div>
              <div className="text-sm text-gray-600 dark:text-gray-400">Services</div>
            </div>
            <div>
              <div className="text-2xl font-bold text-blue-600 dark:text-blue-400">99.2%</div>
              <div className="text-sm text-gray-600 dark:text-gray-400">Uptime</div>
            </div>
            <div>
              <div className="text-2xl font-bold text-blue-600 dark:text-blue-400">60%</div>
              <div className="text-sm text-gray-600 dark:text-gray-400">LLM Latency Cut</div>
            </div>
          </div>
        </section>

        {/* Skills Grid */}
        <section className="mb-12">
          <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-6">
            Technologies & Skills
          </h2>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            {skillCategories.map((category) => (
              <div
                key={category.title}
                className="bg-gray-50 dark:bg-gray-900 rounded-lg p-4 border border-gray-200 dark:border-gray-800"
              >
                <h3 className="font-semibold text-gray-900 dark:text-white mb-2">
                  {category.title}
                </h3>
                <div className="flex flex-wrap gap-2">
                  {category.skills.map((skill) => (
                    <span
                      key={skill}
                      className="text-xs px-2 py-1 rounded bg-blue-100 dark:bg-blue-900 text-blue-800 dark:text-blue-200"
                    >
                      {skill}
                    </span>
                  ))}
                </div>
              </div>
            ))}
          </div>
        </section>

        {/* Core Competencies */}
        <section className="mb-12">
          <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-4">
            Core Competencies Demonstrated
          </h2>
          <div className="bg-gray-50 dark:bg-gray-900 rounded-lg p-6 border border-gray-200 dark:border-gray-800">
            <ul className="space-y-2">
              {coreCompetencies.map((item) => (
                <li key={item} className="flex items-start gap-2 text-gray-700 dark:text-gray-300">
                  <span className="text-blue-500 mt-1">•</span>
                  {item}
                </li>
              ))}
            </ul>
          </div>
        </section>

        {/* Architecture Sections */}
        <section className="mb-12">
          <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-6">
            Architecture Deep Dive
          </h2>

          {/* Infrastructure */}
          <div className="mb-6 bg-gray-50 dark:bg-gray-900 rounded-lg p-6 border border-gray-200 dark:border-gray-800">
            <h3 className="font-semibold text-gray-900 dark:text-white mb-3">
              Infrastructure Layer
            </h3>
            <p className="text-gray-700 dark:text-gray-300 mb-3">
              4-node bare-metal cluster (3 control plane + 1 worker) running Talos Linux—immutable, API-driven OS designed for Kubernetes.
            </p>
            <ul className="space-y-1 text-sm text-gray-600 dark:text-gray-400">
              <li>• <strong>Compute:</strong> Talos Linux nodes, machine config via Terraform</li>
              <li>• <strong>Networking:</strong> Cilium CNI, nginx ingress, Cloudflare Tunnel for zero-trust external access</li>
              <li>• <strong>Storage:</strong> Longhorn for distributed block storage with disk tagging, MinIO for S3</li>
              <li>• <strong>GitOps:</strong> ArgoCD with multi-source Applications and sync waves</li>
            </ul>
          </div>

          {/* Data Platform */}
          <div className="mb-6 bg-gray-50 dark:bg-gray-900 rounded-lg p-6 border border-gray-200 dark:border-gray-800">
            <h3 className="font-semibold text-gray-900 dark:text-white mb-3">
              Data Platform
            </h3>
            <ul className="space-y-1 text-sm text-gray-600 dark:text-gray-400">
              <li>• <strong>PostgreSQL:</strong> CloudNativePG operator with HA, automated failover</li>
              <li>• <strong>Vector DB:</strong> pgvector extension for AI embeddings</li>
              <li>• <strong>Streaming:</strong> Kafka/Redpanda for event-driven architecture</li>
              <li>• <strong>Workflows:</strong> Temporal for durable, long-running processes</li>
            </ul>
          </div>

          {/* AI/ML */}
          <div className="mb-6 bg-gray-50 dark:bg-gray-900 rounded-lg p-6 border border-gray-200 dark:border-gray-800">
            <h3 className="font-semibold text-gray-900 dark:text-white mb-3">
              AI/ML Platform
            </h3>
            <p className="text-gray-700 dark:text-gray-300 mb-3">
              Self-hosted LLM inference with multi-tenant GPU scheduling and 60% latency reduction.
            </p>
            <ul className="space-y-1 text-sm text-gray-600 dark:text-gray-400">
              <li>• <strong>Inference:</strong> vLLM serving Qwen3-32B with INT4 quantization</li>
              <li>• <strong>Multi-model:</strong> Ollama for smaller models, hot-swapping</li>
              <li>• <strong>Embeddings:</strong> TEI for text embeddings and reranking</li>
              <li>• <strong>Orchestration:</strong> KServe + custom Go API gateway</li>
              <li>• <strong>Scheduling:</strong> GPU node affinity with sm70/Volta constraints</li>
            </ul>
          </div>

          {/* Security */}
          <div className="mb-6 bg-gray-50 dark:bg-gray-900 rounded-lg p-6 border border-gray-200 dark:border-gray-800">
            <h3 className="font-semibold text-gray-900 dark:text-white mb-3">
              Identity & Security
            </h3>
            <ul className="space-y-1 text-sm text-gray-600 dark:text-gray-400">
              <li>• <strong>SSO:</strong> Authentik OIDC provider with custom claims and group mapping</li>
              <li>• <strong>RBAC:</strong> Kubernetes RBAC synced with Authentik groups</li>
              <li>• <strong>Secrets:</strong> SOPS-encrypted secrets in git, decrypted at deploy time</li>
              <li>• <strong>TLS:</strong> cert-manager with DNS-01 ACME challenges via Cloudflare</li>
            </ul>
          </div>

          {/* Observability */}
          <div className="bg-gray-50 dark:bg-gray-900 rounded-lg p-6 border border-gray-200 dark:border-gray-800">
            <h3 className="font-semibold text-gray-900 dark:text-white mb-3">
              Observability Stack
            </h3>
            <ul className="space-y-1 text-sm text-gray-600 dark:text-gray-400">
              <li>• <strong>Metrics:</strong> Prometheus with custom recording rules, Grafana dashboards</li>
              <li>• <strong>Logs:</strong> Loki for aggregation, structured logging from all services</li>
              <li>• <strong>Traces:</strong> Tempo + OpenTelemetry Collector for distributed tracing</li>
              <li>• <strong>Alerts:</strong> AlertManager → Slack integration for incident response</li>
            </ul>
          </div>
        </section>

        {/* Applications */}
        <section className="mb-12">
          <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-4">
            Self-Hosted Applications
          </h2>
          <div className="bg-gray-50 dark:bg-gray-900 rounded-lg p-6 border border-gray-200 dark:border-gray-800">
            <div className="flex flex-wrap gap-2">
              {['Paperless-ngx', 'Immich', 'Homarr', 'Portainer', 'Forgejo', 'Authentik'].map((app) => (
                <span
                  key={app}
                  className="text-sm px-3 py-1 rounded-full bg-gray-200 dark:bg-gray-700 text-gray-800 dark:text-gray-200"
                >
                  {app}
                </span>
              ))}
            </div>
          </div>
        </section>
      </div>
    </main>
  )
}