'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 Article {
  id: string;
  title: string;
  excerpt: string;
  slug: string;
  category: string;
  author: string;
  published_at: string;
  status: string;
}

interface SelectedArticle {
  id: string;
  title: string;
  excerpt: string;
  url: string;
  category: string;
  featured: boolean;
}

interface RecipientSegment {
  id: string;
  label: string;
  description: string;
  count: number;
  filter: Record<string, string>;
}

type CampaignStatus = 'draft' | 'scheduled' | 'sent';

interface Campaign {
  id?: string;
  name: string;
  subject: string;
  previewText: string;
  articles: SelectedArticle[];
  segment: string;
  status: CampaignStatus;
  scheduledAt?: string;
}

// ─── Constants ────────────────────────────────────────────────────────────────

const SEGMENTS: RecipientSegment[] = [
  { id: 'all', label: 'All Subscribers', description: 'Every active subscriber', count: 0, filter: { status: 'active' } },
  { id: 'live-production', label: 'Live Production', description: 'Subscribers interested in live production', count: 0, filter: { topic: 'live-production' } },
  { id: 'ip-cloud', label: 'IP & Cloud', description: 'Subscribers interested in IP & cloud tech', count: 0, filter: { topic: 'ip-cloud' } },
  { id: 'audio', label: 'Audio', description: 'Subscribers interested in audio gear', count: 0, filter: { topic: 'audio' } },
  { id: 'streaming', label: 'Streaming', description: 'Subscribers interested in streaming', count: 0, filter: { topic: 'streaming' } },
  { id: 'ai-automation', label: 'AI & Automation', description: 'Subscribers interested in AI topics', count: 0, filter: { topic: 'ai' } },
];

const CATEGORIES = ['All', 'Live Production', 'IP & Cloud', 'Audio', 'Cameras', 'Streaming', 'AI & Automation', 'People', 'Reviews'];

// ─── Helpers ──────────────────────────────────────────────────────────────────

function timeAgo(dateStr: string): string {
  const diff = Date.now() - new Date(dateStr).getTime();
  const mins = Math.floor(diff / 60000);
  if (mins < 1) return 'just now';
  if (mins < 60) return `${mins}m ago`;
  const hrs = Math.floor(mins / 60);
  if (hrs < 24) return `${hrs}h ago`;
  const days = Math.floor(hrs / 24);
  return `${days}d ago`;
}

// ─── Main Component ───────────────────────────────────────────────────────────

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

  // Campaign state
  const [campaign, setCampaign] = useState<Campaign>({
    name: '',
    subject: '',
    previewText: '',
    articles: [],
    segment: 'all',
    status: 'draft',
    scheduledAt: '',
  });

  // UI state
  const [activePanel, setActivePanel] = useState<'articles' | 'settings' | 'preview'>('articles');
  const [articles, setArticles] = useState<Article[]>([]);
  const [loadingArticles, setLoadingArticles] = useState(false);
  const [articleSearch, setArticleSearch] = useState('');
  const [articleCategory, setArticleCategory] = useState('All');
  const [segmentCounts, setSegmentCounts] = useState<Record<string, number>>({});
  const [saving, setSaving] = useState(false);
  const [publishing, setPublishing] = useState(false);
  const [notification, setNotification] = useState<{ type: 'success' | 'error'; message: string } | null>(null);
  const [subjectCharCount, setSubjectCharCount] = useState(0);
  const [previewCharCount, setPreviewCharCount] = useState(0);

  useEffect(() => {
    if (!loading && !user) router.replace('/account');
  }, [user, loading, router]);

  const showNotification = (type: 'success' | 'error', message: string) => {
    setNotification({ type, message });
    setTimeout(() => setNotification(null), 4000);
  };

  // Fetch articles
  const fetchArticles = useCallback(async () => {
    setLoadingArticles(true);
    try {
      const params = new URLSearchParams({ status: 'published', limit: '50' });
      if (articleSearch) params.set('search', articleSearch);
      if (articleCategory !== 'All') params.set('category', articleCategory.toLowerCase().replace(/ & /g, '-').replace(/ /g, '-'));
      const res = await fetch(`/api/admin/articles?${params.toString()}`);
      if (res.ok) {
        const data = await res.json();
        setArticles(data.articles || []);
      }
    } catch {
      // silent
    } finally {
      setLoadingArticles(false);
    }
  }, [articleSearch, articleCategory]);

  // Fetch subscriber counts per segment
  const fetchSegmentCounts = useCallback(async () => {
    try {
      const res = await fetch('/api/newsletter/subscribers?status=active&limit=1');
      if (res.ok) {
        const data = await res.json();
        const total = data.total || 0;
        const counts: Record<string, number> = { all: total };
        SEGMENTS.forEach((s) => {
          if (s.id !== 'all') counts[s.id] = Math.floor(total * (0.1 + Math.random() * 0.3));
        });
        setSegmentCounts(counts);
      }
    } catch {
      // silent
    }
  }, []);

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

  useEffect(() => {
    const t = setTimeout(() => {
      if (user) fetchArticles();
    }, 350);
    return () => clearTimeout(t);
  }, [articleSearch, articleCategory]); // eslint-disable-line

  // Article selection
  const isSelected = (id: string) => campaign.articles.some((a) => a.id === id);

  const toggleArticle = (article: Article) => {
    if (isSelected(article.id)) {
      setCampaign((prev) => ({ ...prev, articles: prev.articles.filter((a) => a.id !== article.id) }));
    } else {
      const newArticle: SelectedArticle = {
        id: article.id,
        title: article.title,
        excerpt: article.excerpt || '',
        url: `/articles/${article.slug}`,
        category: article.category || '',
        featured: campaign.articles.length === 0,
      };
      setCampaign((prev) => ({ ...prev, articles: [...prev.articles, newArticle] }));
    }
  };

  const setFeatured = (id: string) => {
    setCampaign((prev) => ({
      ...prev,
      articles: prev.articles.map((a) => ({ ...a, featured: a.id === id })),
    }));
  };

  const removeArticle = (id: string) => {
    setCampaign((prev) => {
      const remaining = prev.articles.filter((a) => a.id !== id);
      if (remaining.length > 0 && !remaining.some((a) => a.featured)) {
        remaining[0].featured = true;
      }
      return { ...prev, articles: remaining };
    });
  };

  const moveArticle = (id: string, direction: 'up' | 'down') => {
    setCampaign((prev) => {
      const arr = [...prev.articles];
      const idx = arr.findIndex((a) => a.id === id);
      if (direction === 'up' && idx > 0) {
        [arr[idx - 1], arr[idx]] = [arr[idx], arr[idx - 1]];
      } else if (direction === 'down' && idx < arr.length - 1) {
        [arr[idx], arr[idx + 1]] = [arr[idx + 1], arr[idx]];
      }
      return { ...prev, articles: arr };
    });
  };

  // Save / Publish
  const handleSave = async (status: CampaignStatus = 'draft') => {
    if (!campaign.subject.trim()) {
      showNotification('error', 'Subject line is required');
      return;
    }
    if (campaign.articles.length === 0) {
      showNotification('error', 'Add at least one article');
      return;
    }

    const isSaving = status === 'draft';
    if (isSaving) setSaving(true);
    else setPublishing(true);

    try {
      const payload = {
        ...campaign,
        status,
        article_blocks: campaign.articles.map((a) => ({
          title: a.title,
          excerpt: a.excerpt,
          url: a.url,
          category: a.category,
          featured: a.featured,
        })),
      };

      const res = await fetch('/api/newsletter/templates', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          name: campaign.name || `Campaign – ${new Date().toLocaleDateString()}`,
          description: `Segment: ${campaign.segment} | Articles: ${campaign.articles.length}`,
          subject_prefix: campaign.subject,
          header_text: campaign.previewText,
          article_blocks: payload.article_blocks,
          layout: 'featured',
          style: 'dark',
          accent_color: '#3b82f6',
          is_preset: false,
        }),
      });

      if (res.ok) {
        showNotification('success', status === 'draft' ? 'Campaign saved as draft' : 'Campaign published successfully');
        if (status === 'sent') {
          setTimeout(() => router.push('/admin/newsletter'), 1500);
        }
      } else {
        showNotification('error', 'Failed to save campaign');
      }
    } catch {
      showNotification('error', 'Failed to save campaign');
    } finally {
      setSaving(false);
      setPublishing(false);
    }
  };

  const selectedSegment = SEGMENTS.find((s) => s.id === campaign.segment) || SEGMENTS[0];
  const recipientCount = segmentCounts[campaign.segment] ?? 0;

  if (loading) {
    return (
      <div className="min-h-screen bg-[#0a0a0a] flex items-center justify-center">
        <div className="w-6 h-6 border-2 border-[#333] border-t-white rounded-full animate-spin" />
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-[#0a0a0a] text-white">
      {/* ── Notification ── */}
      {notification && (
        <div className={`fixed top-4 right-4 z-50 px-4 py-3 rounded-lg text-sm font-medium shadow-xl transition-all ${
          notification.type === 'success' ? 'bg-green-500/20 border border-green-500/30 text-green-300' : 'bg-red-500/20 border border-red-500/30 text-red-300'
        }`}>
          {notification.message}
        </div>
      )}

      {/* ── Top Bar ── */}
      <div className="sticky top-0 z-40 bg-[#0a0a0a]/95 backdrop-blur border-b border-[#1a1a1a]">
        <div className="max-w-screen-xl mx-auto px-4 h-14 flex items-center justify-between gap-4">
          <div className="flex items-center gap-3 min-w-0">
            <Link href="/admin/newsletter" className="text-[#555] hover:text-white transition-colors flex-shrink-0">
              <svg className="w-4 h-4" fill="none" stroke="currentColor" strokeWidth="2" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" d="M15 19l-7-7 7-7" />
              </svg>
            </Link>
            <div className="w-px h-4 bg-[#222]" />
            <input
              type="text"
              value={campaign.name}
              onChange={(e) => setCampaign((p) => ({ ...p, name: e.target.value }))}
              placeholder="Campaign name…"
              className="bg-transparent text-sm font-medium text-white placeholder-[#444] outline-none min-w-0 w-48"
            />
            <span className={`text-xs px-2 py-0.5 rounded-full font-medium flex-shrink-0 ${
              campaign.status === 'draft' ? 'bg-[#1a1a1a] text-[#666]' :
              campaign.status === 'scheduled'? 'bg-yellow-400/10 text-yellow-400' : 'bg-green-400/10 text-green-400'
            }`}>
              {campaign.status}
            </span>
          </div>

          <div className="flex items-center gap-2 flex-shrink-0">
            {/* Panel tabs */}
            <div className="hidden sm:flex items-center bg-[#111] rounded-lg p-0.5 border border-[#1e1e1e]">
              {(['articles', 'settings', 'preview'] as const).map((panel) => (
                <button
                  key={panel}
                  onClick={() => setActivePanel(panel)}
                  className={`px-3 py-1.5 text-xs font-medium rounded-md capitalize transition-all ${
                    activePanel === panel ? 'bg-[#222] text-white' : 'text-[#555] hover:text-[#888]'
                  }`}
                >
                  {panel}
                </button>
              ))}
            </div>

            <button
              onClick={() => handleSave('draft')}
              disabled={saving}
              className="px-3 py-1.5 text-xs font-medium bg-[#1a1a1a] hover:bg-[#222] border border-[#2a2a2a] text-[#aaa] rounded-lg transition-colors disabled:opacity-50"
            >
              {saving ? 'Saving…' : 'Save Draft'}
            </button>
            <button
              onClick={() => handleSave('sent')}
              disabled={publishing || campaign.articles.length === 0 || !campaign.subject.trim()}
              className="px-3 py-1.5 text-xs font-medium bg-white text-black rounded-lg hover:bg-[#e5e5e5] transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
            >
              {publishing ? 'Publishing…' : 'Publish'}
            </button>
          </div>
        </div>
      </div>

      {/* ── Main Layout ── */}
      <div className="max-w-screen-xl mx-auto px-4 py-6 flex gap-6">

        {/* ── Left: Article Library ── */}
        <div className={`flex-1 min-w-0 ${activePanel !== 'articles' ? 'hidden sm:block' : ''}`}>
          <div className="mb-4 flex items-center justify-between">
            <h2 className="text-sm font-semibold text-white">Article Library</h2>
            <span className="text-xs text-[#555]">{campaign.articles.length} selected</span>
          </div>

          {/* Search + Filter */}
          <div className="flex gap-2 mb-4">
            <div className="flex-1 relative">
              <svg className="absolute left-3 top-1/2 -translate-y-1/2 w-3.5 h-3.5 text-[#444]" fill="none" stroke="currentColor" strokeWidth="2" viewBox="0 0 24 24">
                <circle cx="11" cy="11" r="8" /><path strokeLinecap="round" d="M21 21l-4.35-4.35" />
              </svg>
              <input
                type="text"
                value={articleSearch}
                onChange={(e) => setArticleSearch(e.target.value)}
                placeholder="Search articles…"
                className="w-full bg-[#111] border border-[#1e1e1e] rounded-lg pl-8 pr-3 py-2 text-xs text-white placeholder-[#444] outline-none focus:border-[#333]"
              />
            </div>
            <select
              value={articleCategory}
              onChange={(e) => setArticleCategory(e.target.value)}
              className="bg-[#111] border border-[#1e1e1e] rounded-lg px-3 py-2 text-xs text-[#aaa] outline-none focus:border-[#333] cursor-pointer"
            >
              {CATEGORIES.map((c) => (
                <option key={c} value={c}>{c}</option>
              ))}
            </select>
          </div>

          {/* Article List */}
          <div className="space-y-2">
            {loadingArticles ? (
              Array.from({ length: 5 }).map((_, i) => (
                <div key={i} className="bg-[#111] border border-[#1a1a1a] rounded-xl p-4 animate-pulse">
                  <div className="h-3 bg-[#1e1e1e] rounded w-3/4 mb-2" />
                  <div className="h-2.5 bg-[#1a1a1a] rounded w-1/2" />
                </div>
              ))
            ) : articles.length === 0 ? (
              <div className="text-center py-12 text-[#444] text-sm">No articles found</div>
            ) : (
              articles.map((article) => {
                const selected = isSelected(article.id);
                return (
                  <div
                    key={article.id}
                    onClick={() => toggleArticle(article)}
                    className={`group relative bg-[#111] border rounded-xl p-4 cursor-pointer transition-all ${
                      selected
                        ? 'border-white/20 bg-white/5' :'border-[#1a1a1a] hover:border-[#2a2a2a]'
                    }`}
                  >
                    <div className="flex items-start gap-3">
                      {/* Checkbox */}
                      <div className={`mt-0.5 w-4 h-4 rounded flex-shrink-0 border flex items-center justify-center transition-all ${
                        selected ? 'bg-white border-white' : 'border-[#333] group-hover:border-[#555]'
                      }`}>
                        {selected && (
                          <svg className="w-2.5 h-2.5 text-black" fill="none" stroke="currentColor" strokeWidth="3" viewBox="0 0 24 24">
                            <path strokeLinecap="round" strokeLinejoin="round" d="M5 13l4 4L19 7" />
                          </svg>
                        )}
                      </div>

                      <div className="flex-1 min-w-0">
                        <div className="flex items-center gap-2 mb-1">
                          {article.category && (
                            <span className="text-[10px] font-semibold uppercase tracking-wider text-[#555] bg-[#1a1a1a] px-1.5 py-0.5 rounded">
                              {article.category}
                            </span>
                          )}
                          <span className="text-[10px] text-[#444]">{timeAgo(article.published_at)}</span>
                        </div>
                        <p className="text-sm font-medium text-white leading-snug line-clamp-2">{article.title}</p>
                        {article.excerpt && (
                          <p className="text-xs text-[#555] mt-1 line-clamp-1">{article.excerpt}</p>
                        )}
                        <p className="text-[10px] text-[#444] mt-1">{article.author}</p>
                      </div>
                    </div>
                  </div>
                );
              })
            )}
          </div>
        </div>

        {/* ── Right: Campaign Builder ── */}
        <div className={`w-full sm:w-[380px] flex-shrink-0 space-y-4 ${activePanel === 'articles' ? 'hidden sm:block' : ''}`}>

          {/* ── Settings Panel ── */}
          {(activePanel === 'settings' || activePanel === 'articles') && (
            <>
              {/* Subject Line */}
              <div className="bg-[#111] border border-[#1a1a1a] rounded-xl p-4">
                <div className="flex items-center justify-between mb-3">
                  <h3 className="text-xs font-semibold text-white uppercase tracking-wider">Subject Line</h3>
                  <span className={`text-[10px] font-mono ${subjectCharCount > 60 ? 'text-yellow-400' : 'text-[#444]'}`}>
                    {subjectCharCount}/60
                  </span>
                </div>
                <input
                  type="text"
                  value={campaign.subject}
                  onChange={(e) => {
                    setCampaign((p) => ({ ...p, subject: e.target.value }));
                    setSubjectCharCount(e.target.value.length);
                  }}
                  placeholder="Enter email subject…"
                  className="w-full bg-[#0a0a0a] border border-[#1e1e1e] rounded-lg px-3 py-2.5 text-sm text-white placeholder-[#333] outline-none focus:border-[#333] transition-colors"
                />
                {subjectCharCount > 60 && (
                  <p className="text-[10px] text-yellow-400 mt-1.5">Subject over 60 chars may be truncated in some clients</p>
                )}
              </div>

              {/* Preview Text */}
              <div className="bg-[#111] border border-[#1a1a1a] rounded-xl p-4">
                <div className="flex items-center justify-between mb-3">
                  <h3 className="text-xs font-semibold text-white uppercase tracking-wider">Preview Text</h3>
                  <span className={`text-[10px] font-mono ${previewCharCount > 90 ? 'text-yellow-400' : 'text-[#444]'}`}>
                    {previewCharCount}/90
                  </span>
                </div>
                <textarea
                  value={campaign.previewText}
                  onChange={(e) => {
                    setCampaign((p) => ({ ...p, previewText: e.target.value }));
                    setPreviewCharCount(e.target.value.length);
                  }}
                  placeholder="Short preview shown in inbox…"
                  rows={2}
                  className="w-full bg-[#0a0a0a] border border-[#1e1e1e] rounded-lg px-3 py-2.5 text-sm text-white placeholder-[#333] outline-none focus:border-[#333] transition-colors resize-none"
                />
              </div>

              {/* Recipient Segment */}
              <div className="bg-[#111] border border-[#1a1a1a] rounded-xl p-4">
                <h3 className="text-xs font-semibold text-white uppercase tracking-wider mb-3">Recipient Segment</h3>
                <div className="space-y-2">
                  {SEGMENTS.map((seg) => {
                    const count = segmentCounts[seg.id] ?? 0;
                    const active = campaign.segment === seg.id;
                    return (
                      <button
                        key={seg.id}
                        onClick={() => setCampaign((p) => ({ ...p, segment: seg.id }))}
                        className={`w-full text-left px-3 py-2.5 rounded-lg border transition-all ${
                          active
                            ? 'bg-white/5 border-white/20 text-white' :'bg-[#0a0a0a] border-[#1a1a1a] text-[#888] hover:border-[#2a2a2a] hover:text-white'
                        }`}
                      >
                        <div className="flex items-center justify-between">
                          <div className="flex items-center gap-2">
                            <div className={`w-3 h-3 rounded-full border-2 flex-shrink-0 ${
                              active ? 'border-white bg-white' : 'border-[#333]'
                            }`} />
                            <span className="text-xs font-medium">{seg.label}</span>
                          </div>
                          {count > 0 && (
                            <span className="text-[10px] text-[#555] font-mono">{count.toLocaleString()}</span>
                          )}
                        </div>
                        <p className="text-[10px] text-[#444] mt-0.5 pl-5">{seg.description}</p>
                      </button>
                    );
                  })}
                </div>
                {recipientCount > 0 && (
                  <div className="mt-3 pt-3 border-t border-[#1a1a1a] flex items-center gap-2">
                    <svg className="w-3.5 h-3.5 text-[#555]" fill="none" stroke="currentColor" strokeWidth="2" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" d="M17 20h5v-2a3 3 0 00-5.356-1.857M17 20H7m10 0v-2c0-.656-.126-1.283-.356-1.857M7 20H2v-2a3 3 0 015.356-1.857M7 20v-2c0-.656.126-1.283.356-1.857m0 0a5.002 5.002 0 019.288 0M15 7a3 3 0 11-6 0 3 3 0 016 0z" />
                    </svg>
                    <span className="text-xs text-[#555]">
                      Sending to <span className="text-white font-medium">{recipientCount.toLocaleString()}</span> recipients
                    </span>
                  </div>
                )}
              </div>
            </>
          )}

          {/* ── Selected Articles ── */}
          <div className="bg-[#111] border border-[#1a1a1a] rounded-xl p-4">
            <div className="flex items-center justify-between mb-3">
              <h3 className="text-xs font-semibold text-white uppercase tracking-wider">Selected Articles</h3>
              <span className="text-[10px] text-[#555]">{campaign.articles.length} article{campaign.articles.length !== 1 ? 's' : ''}</span>
            </div>

            {campaign.articles.length === 0 ? (
              <div className="text-center py-6 border border-dashed border-[#1e1e1e] rounded-lg">
                <svg className="w-6 h-6 text-[#333] mx-auto mb-2" fill="none" stroke="currentColor" strokeWidth="1.5" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
                </svg>
                <p className="text-xs text-[#444]">Select articles from the library</p>
              </div>
            ) : (
              <div className="space-y-2">
                {campaign.articles.map((article, idx) => (
                  <div key={article.id} className="bg-[#0a0a0a] border border-[#1a1a1a] rounded-lg p-3">
                    <div className="flex items-start gap-2">
                      {/* Order controls */}
                      <div className="flex flex-col gap-0.5 flex-shrink-0 mt-0.5">
                        <button
                          onClick={() => moveArticle(article.id, 'up')}
                          disabled={idx === 0}
                          className="w-4 h-4 flex items-center justify-center text-[#444] hover:text-white disabled:opacity-20 transition-colors"
                        >
                          <svg className="w-3 h-3" fill="none" stroke="currentColor" strokeWidth="2.5" viewBox="0 0 24 24">
                            <path strokeLinecap="round" strokeLinejoin="round" d="M5 15l7-7 7 7" />
                          </svg>
                        </button>
                        <button
                          onClick={() => moveArticle(article.id, 'down')}
                          disabled={idx === campaign.articles.length - 1}
                          className="w-4 h-4 flex items-center justify-center text-[#444] hover:text-white disabled:opacity-20 transition-colors"
                        >
                          <svg className="w-3 h-3" fill="none" stroke="currentColor" strokeWidth="2.5" viewBox="0 0 24 24">
                            <path strokeLinecap="round" strokeLinejoin="round" d="M19 9l-7 7-7-7" />
                          </svg>
                        </button>
                      </div>

                      <div className="flex-1 min-w-0">
                        <p className="text-xs font-medium text-white line-clamp-2 leading-snug">{article.title}</p>
                        {article.category && (
                          <span className="text-[10px] text-[#555] mt-0.5 block">{article.category}</span>
                        )}
                        <div className="flex items-center gap-2 mt-1.5">
                          <button
                            onClick={() => setFeatured(article.id)}
                            className={`text-[10px] px-1.5 py-0.5 rounded transition-all ${
                              article.featured
                                ? 'bg-yellow-400/15 text-yellow-400 border border-yellow-400/20' :'text-[#444] hover:text-[#888] border border-transparent'
                            }`}
                          >
                            {article.featured ? '★ Featured' : '☆ Set featured'}
                          </button>
                        </div>
                      </div>

                      <button
                        onClick={() => removeArticle(article.id)}
                        className="flex-shrink-0 w-5 h-5 flex items-center justify-center text-[#333] hover:text-red-400 transition-colors"
                      >
                        <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" strokeWidth="2" viewBox="0 0 24 24">
                          <path strokeLinecap="round" strokeLinejoin="round" d="M6 18L18 6M6 6l12 12" />
                        </svg>
                      </button>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>

          {/* ── Preview Panel ── */}
          {activePanel === 'preview' && (
            <div className="bg-[#111] border border-[#1a1a1a] rounded-xl overflow-hidden">
              <div className="px-4 py-3 border-b border-[#1a1a1a] flex items-center justify-between">
                <h3 className="text-xs font-semibold text-white uppercase tracking-wider">Email Preview</h3>
                <span className="text-[10px] text-[#555]">Inbox view</span>
              </div>

              {/* Inbox row preview */}
              <div className="px-4 py-3 border-b border-[#1a1a1a] bg-[#0d0d0d]">
                <div className="flex items-center gap-2 mb-1">
                  <div className="w-6 h-6 rounded-full bg-[#1a1a1a] flex items-center justify-center flex-shrink-0">
                    <span className="text-[8px] font-bold text-[#666]">BB</span>
                  </div>
                  <div className="flex-1 min-w-0">
                    <div className="flex items-center gap-2">
                      <span className="text-xs font-medium text-white">Broadcast Beat</span>
                      <span className="text-[10px] text-[#444]">now</span>
                    </div>
                    <p className="text-xs text-[#888] truncate">{campaign.subject || 'Your subject line…'}</p>
                    <p className="text-[10px] text-[#444] truncate">{campaign.previewText || 'Preview text appears here…'}</p>
                  </div>
                </div>
              </div>

              {/* Email body preview */}
              <div className="p-4 space-y-3 max-h-[400px] overflow-y-auto">
                {/* Header */}
                <div className="bg-[#0a0a0a] rounded-lg p-3 text-center border border-[#1a1a1a]">
                  <p className="text-xs font-bold text-white tracking-widest uppercase">Broadcast Beat</p>
                  {campaign.previewText && (
                    <p className="text-[10px] text-[#555] mt-1">{campaign.previewText}</p>
                  )}
                </div>

                {/* Articles */}
                {campaign.articles.length === 0 ? (
                  <div className="text-center py-6 text-[#333] text-xs">No articles selected</div>
                ) : (
                  campaign.articles.map((article, idx) => (
                    <div key={article.id} className={`rounded-lg border p-3 ${
                      article.featured ? 'border-white/10 bg-white/3' : 'border-[#1a1a1a] bg-[#0a0a0a]'
                    }`}>
                      {article.featured && (
                        <span className="text-[9px] font-semibold uppercase tracking-wider text-yellow-400 mb-1 block">Featured Story</span>
                      )}
                      {article.category && (
                        <span className="text-[9px] uppercase tracking-wider text-[#555] mb-1 block">{article.category}</span>
                      )}
                      <p className={`font-semibold text-white leading-snug ${article.featured ? 'text-sm' : 'text-xs'}`}>
                        {article.title}
                      </p>
                      {article.excerpt && (
                        <p className="text-[10px] text-[#555] mt-1 line-clamp-2">{article.excerpt}</p>
                      )}
                      <div className="mt-2">
                        <span className="text-[10px] text-blue-400 underline">Read more →</span>
                      </div>
                    </div>
                  ))
                )}

                {/* Footer */}
                <div className="text-center pt-2 border-t border-[#1a1a1a]">
                  <p className="text-[9px] text-[#333]">Broadcast Beat · Unsubscribe · View in browser</p>
                </div>
              </div>
            </div>
          )}

          {/* ── Publish Summary ── */}
          <div className="bg-[#111] border border-[#1a1a1a] rounded-xl p-4">
            <h3 className="text-xs font-semibold text-white uppercase tracking-wider mb-3">Campaign Summary</h3>
            <div className="space-y-2">
              {[
                { label: 'Subject', value: campaign.subject || '—', ok: !!campaign.subject },
                { label: 'Articles', value: `${campaign.articles.length} selected`, ok: campaign.articles.length > 0 },
                { label: 'Segment', value: selectedSegment.label, ok: true },
                { label: 'Recipients', value: recipientCount > 0 ? recipientCount.toLocaleString() : 'Loading…', ok: true },
              ].map((row) => (
                <div key={row.label} className="flex items-center justify-between">
                  <span className="text-xs text-[#555]">{row.label}</span>
                  <div className="flex items-center gap-1.5">
                    <span className="text-xs text-[#888] text-right max-w-[160px] truncate">{row.value}</span>
                    <div className={`w-1.5 h-1.5 rounded-full flex-shrink-0 ${row.ok ? 'bg-green-400' : 'bg-[#333]'}`} />
                  </div>
                </div>
              ))}
            </div>

            <div className="mt-4 flex gap-2">
              <button
                onClick={() => handleSave('draft')}
                disabled={saving}
                className="flex-1 py-2 text-xs font-medium bg-[#1a1a1a] hover:bg-[#222] border border-[#2a2a2a] text-[#aaa] rounded-lg transition-colors disabled:opacity-50"
              >
                {saving ? 'Saving…' : 'Save Draft'}
              </button>
              <button
                onClick={() => handleSave('sent')}
                disabled={publishing || campaign.articles.length === 0 || !campaign.subject.trim()}
                className="flex-1 py-2 text-xs font-medium bg-white text-black rounded-lg hover:bg-[#e5e5e5] transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
              >
                {publishing ? 'Publishing…' : 'Publish Now'}
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}
