'use client';

import React, { useState, useEffect, useCallback } from 'react';
import Link from 'next/link';
import { useAuth } from '@/contexts/AuthContext';
import { useRouter } from 'next/navigation';

// ─── Types ────────────────────────────────────────────────────────────────────

interface NodeStatus {
  name: string;
  online: boolean;
  queueDepth: number;
  latencyMs: number;
  host: string;
  port: number;
}

interface PipelineStatus {
  generatedToday: number;
  siteBreakdown: Record<string, number>;
  queueDepth: number;
  pressReleasesRemaining: number;
  thinContentRemaining: number;
  missingSeoRemaining: number;
  nodes: NodeStatus[];
  timestamp: string;
}

interface AuditSummary {
  totalArticles: number;
  totalPublished: number;
  thinContentCount: number;
  missingFeaturedImageCount: number;
  missingSeoAnyCount: number;
  pressReleaseCount: number;
  averageWordCount: number;
}

interface LaunchChecklist {
  zeroPagesWithMissingFeaturedImages: boolean;
  zeroPagesWithThinContent: boolean;
  zeroPagesMissingSeoMeta: boolean;
  zeroUnrewrittenPressReleases: boolean;
}

// ─── Site labels ──────────────────────────────────────────────────────────────

const SITE_LABELS: Record<string, { label: string; color: string; target: string }> = {
  'avbeat': { label: 'AV Beat', color: 'text-blue-400', target: '15–25/day' },
  'av-beat': { label: 'AV Beat', color: 'text-purple-400', target: '10–15/day' },
  'backlot-beat': { label: 'Backlot Beat', color: 'text-amber-400', target: '10–15/day' },
  'broadcast-engineering': { label: 'BroadcastEngineering.com', color: 'text-green-400', target: '10–15/day' },
};

// ─── Sub-components ───────────────────────────────────────────────────────────

function NodeCard({ node }: { node: NodeStatus }) {
  return (
    <div className={`bg-[#111] border rounded-lg p-4 flex flex-col gap-2 ${node.online ? 'border-green-500/30' : 'border-red-500/30'}`}>
      <div className="flex items-center justify-between">
        <span className="text-sm font-display font-bold text-white">{node.name}</span>
        <span className={`text-xs font-body font-semibold px-2 py-0.5 rounded-full ${node.online ? 'bg-green-500/15 text-green-400' : 'bg-red-500/15 text-red-400'}`}>
          {node.online ? 'ONLINE' : 'OFFLINE'}
        </span>
      </div>
      <p className="text-xs text-[#666] font-body">{node.host}:{node.port}</p>
      {node.online && (
        <div className="flex gap-4 mt-1">
          <div>
            <p className="text-xs text-[#555] font-body">Queue</p>
            <p className={`text-sm font-display font-bold ${node.queueDepth > 10 ? 'text-amber-400' : 'text-green-400'}`}>
              {node.queueDepth === 999 ? '—' : node.queueDepth}
            </p>
          </div>
          <div>
            <p className="text-xs text-[#555] font-body">Latency</p>
            <p className="text-sm font-display font-bold text-white">{node.latencyMs}ms</p>
          </div>
        </div>
      )}
    </div>
  );
}

function StatCard({
  label,
  value,
  sub,
  accent,
  good,
}: {
  label: string;
  value: number | string;
  sub?: string;
  accent: string;
  good?: boolean;
}) {
  return (
    <div className="bg-[#111] border border-[#DCE6F2] rounded-lg p-5 flex flex-col gap-2">
      <p className={`text-2xl font-display font-bold ${accent}`}>{value}</p>
      <p className="text-sm text-[#888] font-body">{label}</p>
      {sub && <p className="text-xs text-[#555] font-body">{sub}</p>}
      {good !== undefined && (
        <span className={`text-xs font-body font-semibold mt-1 ${good ? 'text-green-400' : 'text-amber-400'}`}>
          {good ? '✓ Launch ready' : '⚠ Action needed'}
        </span>
      )}
    </div>
  );
}

function ChecklistItem({ label, done }: { label: string; done: boolean }) {
  return (
    <div className={`flex items-center gap-3 p-3 rounded-lg border ${done ? 'border-green-500/20 bg-green-500/5' : 'border-amber-500/20 bg-amber-500/5'}`}>
      <span className={`text-lg ${done ? 'text-green-400' : 'text-amber-400'}`}>{done ? '✓' : '○'}</span>
      <span className={`text-sm font-body ${done ? 'text-green-300' : 'text-amber-300'}`}>{label}</span>
    </div>
  );
}

// ─── Generate Controls ────────────────────────────────────────────────────────

type RMPSite = 'broadcast-beat' | 'av-beat' | 'backlot-beat' | 'broadcast-engineering';

function GeneratePanel({ onGenerated }: { onGenerated: () => void }) {
  const [site, setSite] = useState<RMPSite>('avbeat');
  const [topic, setTopic] = useState('');
  const [loading, setLoading] = useState(false);
  const [result, setResult] = useState<string | null>(null);
  const [error, setError] = useState<string | null>(null);

  const handleGenerate = async () => {
    setLoading(true);
    setResult(null);
    setError(null);
    try {
      const res = await fetch('/api/content/generate', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ site, topic: topic.trim() || undefined }),
      });
      const data = await res.json();
      if (!res.ok) throw new Error(data.error || 'Generation failed');
      setResult(`✓ Generated: "${data.article?.title}" via ${data.article?.node} (${data.article?.wordCount} words)`);
      onGenerated();
    } catch (e: any) {
      setError(e.message);
    } finally {
      setLoading(false);
    }
  };

  const handleSEOBatch = async () => {
    setLoading(true);
    setResult(null);
    setError(null);
    try {
      const res = await fetch('/api/content/seo-batch', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ site }),
      });
      const data = await res.json();
      if (!res.ok) throw new Error(data.error || 'SEO batch failed');
      setResult(`✓ SEO meta updated: ${data.updated} articles. Remaining: ${data.remaining}`);
      onGenerated();
    } catch (e: any) {
      setError(e.message);
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="bg-[#111] border border-[#DCE6F2] rounded-lg p-5 flex flex-col gap-4">
      <h3 className="text-sm font-display font-bold text-white">Manual Controls</h3>
      <div className="flex flex-col gap-3">
        <div>
          <label className="text-xs text-[#666] font-body mb-1 block">Site</label>
          <select
            value={site}
            onChange={(e) => setSite(e.target.value as RMPSite)}
            className="w-full bg-[#FFFFFF] border border-[#333] rounded-lg px-3 py-2 text-sm text-white font-body focus:outline-none focus:border-[#1D4ED8]"
          >
            {Object.entries(SITE_LABELS).map(([key, val]) => (
              <option key={key} value={key}>{val.label}</option>
            ))}
          </select>
        </div>
        <div>
          <label className="text-xs text-[#666] font-body mb-1 block">Topic (optional)</label>
          <input
            type="text"
            value={topic}
            onChange={(e) => setTopic(e.target.value)}
            placeholder="e.g. ATSC 3.0 deployment update"
            className="w-full bg-[#FFFFFF] border border-[#333] rounded-lg px-3 py-2 text-sm text-white font-body placeholder-[#444] focus:outline-none focus:border-[#1D4ED8]"
          />
        </div>
        <div className="flex gap-2">
          <button
            onClick={handleGenerate}
            disabled={loading}
            className="flex-1 bg-[#1D4ED8] hover:bg-[#1E3A8A] disabled:opacity-50 text-white text-sm font-body font-semibold py-2 px-4 rounded-lg transition-colors"
          >
            {loading ? 'Generating…' : 'Generate Article'}
          </button>
          <button
            onClick={handleSEOBatch}
            disabled={loading}
            className="flex-1 bg-[#FFFFFF] hover:bg-[#DCE6F2] disabled:opacity-50 border border-[#333] text-white text-sm font-body font-semibold py-2 px-4 rounded-lg transition-colors"
          >
            {loading ? 'Running…' : 'Batch SEO Meta'}
          </button>
        </div>
        {result && <p className="text-xs text-green-400 font-body bg-green-500/10 border border-green-500/20 rounded-lg p-2">{result}</p>}
        {error && <p className="text-xs text-red-400 font-body bg-red-500/10 border border-red-500/20 rounded-lg p-2">{error}</p>}
      </div>
    </div>
  );
}

// ─── Main Page ────────────────────────────────────────────────────────────────

export default function ContentStatusPage() {
  const { user, loading } = useAuth();
  const router = useRouter();

  const [status, setStatus] = useState<PipelineStatus | null>(null);
  const [audit, setAudit] = useState<AuditSummary | null>(null);
  const [checklist, setChecklist] = useState<LaunchChecklist | null>(null);
  const [loadingData, setLoadingData] = useState(true);
  const [lastRefresh, setLastRefresh] = useState<Date | null>(null);
  const [autoRefresh, setAutoRefresh] = useState(true);

  const fetchAll = useCallback(async () => {
    try {
      const [statusRes, auditRes] = await Promise.all([
        fetch('/api/content/pipeline-status'),
        fetch('/api/content/audit'),
      ]);

      if (statusRes.ok) {
        const s = await statusRes.json();
        setStatus(s);
      }

      if (auditRes.ok) {
        const a = await auditRes.json();
        setAudit(a.summary);
        setChecklist(a.launchChecklist);
      }

      setLastRefresh(new Date());
    } catch {
      // silent
    } finally {
      setLoadingData(false);
    }
  }, []);

  useEffect(() => {
    if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname));
  }, [user, loading, router]);

  useEffect(() => {
    if (user) fetchAll();
  }, [user, fetchAll]);

  // Auto-refresh every 30 seconds
  useEffect(() => {
    if (!autoRefresh || !user) return;
    const interval = setInterval(fetchAll, 30_000);
    return () => clearInterval(interval);
  }, [autoRefresh, user, fetchAll]);

  if (loading || loadingData) {
    return (
      <div className="min-h-screen bg-[#0a0a0a] flex items-center justify-center">
        <div className="flex flex-col items-center gap-3">
          <div className="w-8 h-8 border-2 border-[#1D4ED8] border-t-transparent rounded-full animate-spin" />
          <p className="text-[#555] text-sm font-body">Loading content status…</p>
        </div>
      </div>
    );
  }

  if (!user) return null;

  const allNodesOffline = status?.nodes.every((n) => !n.online) ?? false;
  const launchReady = checklist
    ? Object.values(checklist).every(Boolean)
    : false;

  return (
    <div className="min-h-screen bg-[#0a0a0a] text-white">
      {/* Header */}
      <div className="border-b border-[#FFFFFF] bg-[#F8FAFC] px-6 py-4">
        <div className="max-w-7xl mx-auto flex items-center justify-between">
          <div className="flex items-center gap-3">
            <Link href="/admin" className="text-[#555] hover:text-white transition-colors text-sm font-body">
              ← Admin
            </Link>
            <span className="text-[#333]">/</span>
            <h1 className="text-lg font-display font-bold text-white">Content Pipeline Status</h1>
            {allNodesOffline && (
              <span className="text-xs font-body font-semibold px-2 py-0.5 rounded-full bg-red-500/15 text-red-400 animate-pulse">
                ALL NODES OFFLINE
              </span>
            )}
          </div>
          <div className="flex items-center gap-3">
            {lastRefresh && (
              <span className="text-xs text-[#555] font-body">
                Updated {lastRefresh.toLocaleTimeString()}
              </span>
            )}
            <button
              onClick={() => setAutoRefresh((v) => !v)}
              className={`text-xs font-body px-3 py-1.5 rounded-lg border transition-colors ${
                autoRefresh
                  ? 'border-green-500/30 text-green-400 bg-green-500/10' :'border-[#333] text-[#666] bg-[#111]'
              }`}
            >
              {autoRefresh ? '⟳ Auto-refresh ON' : '⟳ Auto-refresh OFF'}
            </button>
            <button
              onClick={fetchAll}
              className="text-xs font-body px-3 py-1.5 rounded-lg border border-[#333] text-white bg-[#111] hover:bg-[#FFFFFF] transition-colors"
            >
              Refresh Now
            </button>
          </div>
        </div>
      </div>

      <div className="max-w-7xl mx-auto px-6 py-8 flex flex-col gap-8">

        {/* AI Node Status */}
        <section>
          <h2 className="text-sm font-display font-bold text-[#888] uppercase tracking-wider mb-4">AI Node Status</h2>
          <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
            {(status?.nodes || [
              { name: 'AI_001', online: false, queueDepth: 0, latencyMs: 0, host: '68.248.192.64', port: 8765 },
              { name: 'AI_002', online: false, queueDepth: 0, latencyMs: 0, host: '68.248.192.64', port: 8766 },
            ]).map((node) => (
              <NodeCard key={node.name} node={node} />
            ))}
          </div>
          {allNodesOffline && (
            <div className="mt-3 p-3 bg-red-500/10 border border-red-500/20 rounded-lg">
              <p className="text-sm text-red-400 font-body">
                ⚠ Both AI nodes are offline. New generation jobs are being queued and will retry automatically every 5 minutes.
              </p>
            </div>
          )}
        </section>

        {/* Today's Pipeline */}
        <section>
          <h2 className="text-sm font-display font-bold text-[#888] uppercase tracking-wider mb-4">Today's Pipeline</h2>
          <div className="grid grid-cols-2 sm:grid-cols-4 gap-4">
            <StatCard
              label="Articles Generated Today"
              value={status?.generatedToday ?? '—'}
              accent="text-blue-400"
              sub="All sites combined"
            />
            <StatCard
              label="Queue Depth"
              value={status?.queueDepth ?? '—'}
              accent={status && status.queueDepth > 10 ? 'text-amber-400' : 'text-green-400'}
              sub="Jobs pending across nodes"
            />
            <StatCard
              label="Press Releases Remaining"
              value={status?.pressReleasesRemaining ?? '—'}
              accent={status && status.pressReleasesRemaining > 0 ? 'text-amber-400' : 'text-green-400'}
              good={status?.pressReleasesRemaining === 0}
            />
            <StatCard
              label="SEO Meta Missing"
              value={status?.missingSeoRemaining ?? '—'}
              accent={status && status.missingSeoRemaining > 0 ? 'text-amber-400' : 'text-green-400'}
              good={status?.missingSeoRemaining === 0}
            />
          </div>
        </section>

        {/* Per-Site Breakdown */}
        <section>
          <h2 className="text-sm font-display font-bold text-[#888] uppercase tracking-wider mb-4">Per-Site Breakdown (Today)</h2>
          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
            {Object.entries(SITE_LABELS).map(([key, cfg]) => {
              const count = status?.siteBreakdown?.[key] ?? 0;
              return (
                <div key={key} className="bg-[#111] border border-[#DCE6F2] rounded-lg p-4 flex flex-col gap-2">
                  <p className={`text-xs font-body font-semibold ${cfg.color}`}>{cfg.label}</p>
                  <p className="text-3xl font-display font-bold text-white">{count}</p>
                  <p className="text-xs text-[#555] font-body">Target: {cfg.target}</p>
                </div>
              );
            })}
          </div>
        </section>

        {/* Content Audit Summary */}
        {audit && (
          <section>
            <h2 className="text-sm font-display font-bold text-[#888] uppercase tracking-wider mb-4">Content Audit</h2>
            <div className="grid grid-cols-2 sm:grid-cols-3 lg:grid-cols-6 gap-4">
              <StatCard label="Total Articles" value={audit.totalArticles} accent="text-white" />
              <StatCard label="Published" value={audit.totalPublished} accent="text-green-400" />
              <StatCard
                label="Thin Content (<300w)"
                value={audit.thinContentCount}
                accent={audit.thinContentCount > 0 ? 'text-amber-400' : 'text-green-400'}
                good={audit.thinContentCount === 0}
              />
              <StatCard
                label="Missing Featured Image"
                value={audit.missingFeaturedImageCount}
                accent={audit.missingFeaturedImageCount > 0 ? 'text-amber-400' : 'text-green-400'}
                good={audit.missingFeaturedImageCount === 0}
              />
              <StatCard
                label="Missing SEO Meta"
                value={audit.missingSeoAnyCount}
                accent={audit.missingSeoAnyCount > 0 ? 'text-amber-400' : 'text-green-400'}
                good={audit.missingSeoAnyCount === 0}
              />
              <StatCard label="Avg Word Count" value={audit.averageWordCount} accent="text-blue-400" />
            </div>
          </section>
        )}

        {/* Launch Checklist */}
        <section>
          <div className="flex items-center gap-3 mb-4">
            <h2 className="text-sm font-display font-bold text-[#888] uppercase tracking-wider">Launch Checklist</h2>
            {launchReady && (
              <span className="text-xs font-body font-semibold px-2 py-0.5 rounded-full bg-green-500/15 text-green-400">
                LAUNCH READY
              </span>
            )}
          </div>
          <div className="grid grid-cols-1 sm:grid-cols-2 gap-3">
            <ChecklistItem
              label="Zero pages with missing featured images"
              done={checklist?.zeroPagesWithMissingFeaturedImages ?? false}
            />
            <ChecklistItem
              label="Zero pages with thin content (under 300 words)"
              done={checklist?.zeroPagesWithThinContent ?? false}
            />
            <ChecklistItem
              label="Zero pages missing SEO meta title and description"
              done={checklist?.zeroPagesMissingSeoMeta ?? false}
            />
            <ChecklistItem
              label="Zero unrewritten press releases in published state"
              done={checklist?.zeroUnrewrittenPressReleases ?? false}
            />
            <ChecklistItem
              label="Daily content pipeline running and generating new articles"
              done={(status?.generatedToday ?? 0) > 0}
            />
            <ChecklistItem
              label="AI nodes online and responding"
              done={!allNodesOffline}
            />
          </div>
        </section>

        {/* Manual Controls */}
        <section>
          <h2 className="text-sm font-display font-bold text-[#888] uppercase tracking-wider mb-4">Manual Controls</h2>
          <div className="max-w-lg">
            <GeneratePanel onGenerated={fetchAll} />
          </div>
        </section>

        {/* API Reference */}
        <section>
          <h2 className="text-sm font-display font-bold text-[#888] uppercase tracking-wider mb-4">API Endpoints</h2>
          <div className="bg-[#111] border border-[#DCE6F2] rounded-lg p-5 grid grid-cols-1 sm:grid-cols-2 gap-3">
            {[
              { method: 'GET', path: '/api/content/audit', desc: 'Full content audit report' },
              { method: 'GET', path: '/api/content/pipeline-status', desc: 'Live pipeline + node status' },
              { method: 'POST', path: '/api/content/generate', desc: 'Generate one article { site, topic? }' },
              { method: 'GET', path: '/api/content/press-releases', desc: 'List unedited press releases' },
              { method: 'POST', path: '/api/content/press-releases', desc: 'Rewrite a press release { articleId, source, site }' },
              { method: 'POST', path: '/api/content/seo-batch', desc: 'Batch-generate missing SEO meta { site? }' },
              { method: 'GET', path: '/api/ai/node-health', desc: 'AI_001 node health check' },
              { method: 'GET', path: '/api/ai/ollama-health', desc: 'AI_001 ping check' },
            ].map((ep) => (
              <div key={ep.path} className="flex items-start gap-2">
                <span className={`text-xs font-body font-bold px-1.5 py-0.5 rounded flex-shrink-0 ${ep.method === 'GET' ? 'bg-blue-500/15 text-blue-400' : 'bg-green-500/15 text-green-400'}`}>
                  {ep.method}
                </span>
                <div>
                  <code className="text-xs text-[#ccc] font-mono">{ep.path}</code>
                  <p className="text-xs text-[#555] font-body mt-0.5">{ep.desc}</p>
                </div>
              </div>
            ))}
          </div>
        </section>

      </div>
    </div>
  );
}
