'use client';

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

interface ImportedPost {
  id: string;
  wp_id: number;
  wp_slug: string;
  title: string;
  author_name: string;
  category: string | null;
  featured_image: string | null;
  featured_image_alt: string | null;
  wp_published_at: string | null;
  imported_at: string;
  status: string;
}

interface ImportLog {
  id: string;
  started_at: string;
  completed_at: string | null;
  total_fetched: number;
  total_imported: number;
  total_skipped: number;
  total_errors: number;
  status: string;
  error_message: string | null;
}

interface ImportResult {
  success?: boolean;
  error?: string;
  totalFetched?: number;
  totalImported?: number;
  totalErrors?: number;
  pagesProcessed?: number;
}

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

  const [posts, setPosts] = useState<ImportedPost[]>([]);
  const [logs, setLogs] = useState<ImportLog[]>([]);
  const [isImporting, setIsImporting] = useState(false);
  const [importResult, setImportResult] = useState<ImportResult | null>(null);
  const [loadingData, setLoadingData] = useState(true);
  const [deletingId, setDeletingId] = useState<string | null>(null);
  const [maxPages, setMaxPages] = useState(5);
  const [searchQuery, setSearchQuery] = useState('');
  const [activeTab, setActiveTab] = useState<'posts' | 'logs'>('posts');

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

  const fetchData = useCallback(async () => {
    try {
      const res = await fetch('/api/wp-import');
      if (res.ok) {
        const data = await res.json();
        setPosts(data?.posts || []);
        setLogs(data?.logs || []);
      }
    } catch {
      // silent
    } finally {
      setLoadingData(false);
    }
  }, []);

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

  const handleImport = async () => {
    setIsImporting(true);
    setImportResult(null);
    try {
      const res = await fetch('/api/wp-import', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ maxPages }),
      });
      const data = await res.json();
      setImportResult(data);
      if (data?.success) {
        await fetchData();
      }
    } catch (err: any) {
      setImportResult({ error: err?.message || 'Import failed' });
    } finally {
      setIsImporting(false);
    }
  };

  const handleDelete = async (id: string) => {
    setDeletingId(id);
    try {
      const res = await fetch('/api/wp-import', {
        method: 'DELETE',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ id }),
      });
      if (res.ok) {
        setPosts((prev) => prev.filter((p) => p.id !== id));
      }
    } catch {
      // silent
    } finally {
      setDeletingId(null);
    }
  };

  const filteredPosts = posts.filter((p) =>
    !searchQuery ||
    p.title?.toLowerCase().includes(searchQuery.toLowerCase()) ||
    p.author_name?.toLowerCase().includes(searchQuery.toLowerCase()) ||
    p.category?.toLowerCase().includes(searchQuery.toLowerCase())
  );

  const formatDate = (dateStr: string | null) => {
    if (!dateStr) return '—';
    return new Date(dateStr).toLocaleDateString('en-US', { year: 'numeric', month: 'short', day: 'numeric' });
  };

  if (loading || (!user && !loading)) {
    return (
      <div className="min-h-screen bg-[#0a0a0a] flex items-center justify-center">
        <div className="w-6 h-6 border-2 border-[#1D4ED8] border-t-transparent rounded-full animate-spin" />
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-[#0a0a0a] text-[#cccccc]">
      {/* Page Header */}
      <div className="bg-[#F8FAFC] border-b border-[#DCE6F2]">
        <div className="max-w-6xl mx-auto px-4 py-5">
          <div className="flex items-center gap-3 mb-1">
            <Link href="/home-page" className="text-[#555] hover:text-[#1D4ED8] transition-colors text-sm">
              Home
            </Link>
            <span className="text-[#333]">/</span>
            <span className="text-[#888] text-sm">Admin</span>
            <span className="text-[#333]">/</span>
            <span className="text-[#cccccc] text-sm">WP Import</span>
          </div>
          <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4 mt-3">
            <div>
              <h1 className="text-2xl font-bold text-white font-heading">WordPress Post Importer</h1>
              <p className="text-[#666] text-sm mt-1">
                Import posts from{' '}
                <a href="https://www.avbeat.com" target="_blank" rel="noopener noreferrer" className="text-[#1D4ED8] hover:underline">
                  avbeat.com
                </a>{' '}
                via WordPress REST API
              </p>
            </div>
            <div className="flex items-center gap-2 text-xs text-[#555] bg-[#FFFFFF] border border-[#DCE6F2] rounded px-3 py-2">
              <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="text-[#1D4ED8]">
                <circle cx="12" cy="12" r="10" /><path d="M12 8v4l3 3" />
              </svg>
              {posts.length} posts imported
            </div>
          </div>
        </div>
      </div>

      <div className="max-w-6xl mx-auto px-4 py-6 space-y-6">
        {/* Import Controls */}
        <div className="bg-[#F8FAFC] border border-[#DCE6F2] rounded-lg p-5">
          <h2 className="text-base font-bold text-white font-heading mb-4 flex items-center gap-2">
            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="text-[#1D4ED8]">
              <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" /><polyline points="7 10 12 15 17 10" /><line x1="12" y1="15" x2="12" y2="3" />
            </svg>
            Run Import
          </h2>

          <div className="flex flex-col sm:flex-row gap-4 items-start sm:items-end">
            <div>
              <label className="block text-xs text-[#666] mb-1.5 uppercase tracking-wider">Pages to fetch</label>
              <select
                value={maxPages}
                onChange={(e) => setMaxPages(Number(e.target.value))}
                disabled={isImporting}
                className="bg-[#FFFFFF] border border-[#333] text-[#cccccc] text-sm rounded px-3 py-2 focus:outline-none focus:border-[#1D4ED8] disabled:opacity-50">
                <option value={1}>1 page (~20 posts)</option>
                <option value={3}>3 pages (~60 posts)</option>
                <option value={5}>5 pages (~100 posts)</option>
                <option value={10}>10 pages (~200 posts)</option>
                <option value={20}>20 pages (~400 posts)</option>
                <option value={50}>All pages (full import)</option>
              </select>
            </div>

            <button
              onClick={handleImport}
              disabled={isImporting}
              className="flex items-center gap-2 bg-[#1D4ED8] hover:bg-[#1E3A8A] disabled:bg-[#DCE6F2] disabled:cursor-not-allowed text-white text-sm font-bold px-5 py-2 rounded transition-colors">
              {isImporting ? (
                <>
                  <div className="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin" />
                  Importing...
                </>
              ) : (
                <>
                  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5">
                    <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" /><polyline points="7 10 12 15 17 10" /><line x1="12" y1="15" x2="12" y2="3" />
                  </svg>
                  Start Import
                </>
              )}
            </button>
          </div>

          {/* Import Progress / Result */}
          {isImporting && (
            <div className="mt-4 bg-[#0d1a2e] border border-[#DCE6F2] rounded p-4">
              <div className="flex items-center gap-3">
                <div className="w-5 h-5 border-2 border-[#1D4ED8] border-t-transparent rounded-full animate-spin flex-shrink-0" />
                <div>
                  <p className="text-[#1D4ED8] text-sm font-bold">Import in progress</p>
                  <p className="text-[#666] text-xs mt-0.5">Fetching posts from avbeat.com and saving to database...</p>
                </div>
              </div>
              <div className="mt-3 h-1.5 bg-[#FFFFFF] rounded-full overflow-hidden">
                <div className="h-full bg-[#1D4ED8] rounded-full animate-pulse w-2/3" />
              </div>
            </div>
          )}

          {importResult && !isImporting && (
            <div className={`mt-4 rounded p-4 border ${importResult.error ? 'bg-[#1a0a0a] border-[#5f1e1e]' : 'bg-[#0a1a0a] border-[#1e5f1e]'}`}>
              {importResult.error ? (
                <div className="flex items-start gap-2">
                  <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="text-red-400 flex-shrink-0 mt-0.5">
                    <circle cx="12" cy="12" r="10" /><line x1="15" y1="9" x2="9" y2="15" /><line x1="9" y1="9" x2="15" y2="15" />
                  </svg>
                  <div>
                    <p className="text-red-400 text-sm font-bold">Import failed</p>
                    <p className="text-[#888] text-xs mt-0.5">{importResult.error}</p>
                  </div>
                </div>
              ) : (
                <div>
                  <div className="flex items-center gap-2 mb-3">
                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="text-green-400">
                      <path d="M22 11.08V12a10 10 0 1 1-5.93-9.14" /><polyline points="22 4 12 14.01 9 11.01" />
                    </svg>
                    <p className="text-green-400 text-sm font-bold">Import completed successfully</p>
                  </div>
                  <div className="grid grid-cols-2 sm:grid-cols-4 gap-3">
                    {[
                      { label: 'Fetched', value: importResult.totalFetched, color: 'text-[#cccccc]' },
                      { label: 'Imported', value: importResult.totalImported, color: 'text-green-400' },
                      { label: 'Pages', value: importResult.pagesProcessed, color: 'text-[#1D4ED8]' },
                      { label: 'Errors', value: importResult.totalErrors, color: importResult.totalErrors ? 'text-red-400' : 'text-[#555]' },
                    ].map((stat) => (
                      <div key={stat.label} className="bg-[#111] rounded p-2.5 text-center">
                        <p className={`text-xl font-bold ${stat.color}`}>{stat.value ?? 0}</p>
                        <p className="text-[#555] text-xs mt-0.5">{stat.label}</p>
                      </div>
                    ))}
                  </div>
                </div>
              )}
            </div>
          )}
        </div>

        {/* Tabs */}
        <div className="flex gap-0 border-b border-[#DCE6F2]">
          {(['posts', 'logs'] as const).map((tab) => (
            <button
              key={tab}
              onClick={() => setActiveTab(tab)}
              className={`px-5 py-2.5 text-sm font-bold uppercase tracking-wider border-b-2 transition-colors ${
                activeTab === tab
                  ? 'border-[#1D4ED8] text-[#1D4ED8]'
                  : 'border-transparent text-[#666] hover:text-[#999]'
              }`}>
              {tab === 'posts' ? `Imported Posts (${posts.length})` : `Import History (${logs.length})`}
            </button>
          ))}
        </div>

        {/* Posts Tab */}
        {activeTab === 'posts' && (
          <div>
            {/* Search */}
            <div className="mb-4">
              <div className="relative max-w-sm">
                <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="absolute left-3 top-1/2 -translate-y-1/2 text-[#555]">
                  <circle cx="11" cy="11" r="8" /><line x1="21" y1="21" x2="16.65" y2="16.65" />
                </svg>
                <input
                  type="text"
                  placeholder="Search posts..."
                  value={searchQuery}
                  onChange={(e) => setSearchQuery(e.target.value)}
                  className="w-full bg-[#111] border border-[#DCE6F2] text-[#cccccc] text-sm rounded pl-9 pr-4 py-2 focus:outline-none focus:border-[#1D4ED8] placeholder-[#444]"
                />
              </div>
            </div>

            {loadingData ? (
              <div className="flex items-center justify-center py-16">
                <div className="w-6 h-6 border-2 border-[#1D4ED8] border-t-transparent rounded-full animate-spin" />
              </div>
            ) : filteredPosts.length === 0 ? (
              <div className="text-center py-16 bg-[#111] border border-[#DCE6F2] rounded-lg">
                <svg width="40" height="40" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" className="text-[#333] mx-auto mb-3">
                  <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" /><polyline points="14 2 14 8 20 8" /><line x1="16" y1="13" x2="8" y2="13" /><line x1="16" y1="17" x2="8" y2="17" /><polyline points="10 9 9 9 8 9" />
                </svg>
                <p className="text-[#555] text-sm">
                  {searchQuery ? 'No posts match your search' : 'No posts imported yet. Run an import to get started.'}
                </p>
              </div>
            ) : (
              <div className="space-y-2">
                {filteredPosts.map((post) => (
                  <div key={post.id} className="bg-[#111] border border-[#DCE6F2] rounded-lg p-4 flex items-start gap-4 hover:border-[#333] transition-colors">
                    {/* Thumbnail */}
                    {post.featured_image ? (
                      <div className="flex-shrink-0 w-16 h-12 rounded overflow-hidden bg-[#FFFFFF]">
                        <AppImage
                          src={post.featured_image}
                          alt={post.featured_image_alt || post.title}
                          width={64}
                          height={48}
                          className="w-full h-full object-cover"
                        />
                      </div>
                    ) : (
                      <div className="flex-shrink-0 w-16 h-12 rounded bg-[#FFFFFF] flex items-center justify-center">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" className="text-[#333]">
                          <rect x="3" y="3" width="18" height="18" rx="2" /><circle cx="8.5" cy="8.5" r="1.5" /><polyline points="21 15 16 10 5 21" />
                        </svg>
                      </div>
                    )}

                    {/* Content */}
                    <div className="flex-1 min-w-0">
                      <div className="flex items-start justify-between gap-3">
                        <div className="min-w-0">
                          <h3 className="text-sm font-bold text-[#cccccc] leading-snug line-clamp-1">{post.title}</h3>
                          <div className="flex flex-wrap items-center gap-x-3 gap-y-1 mt-1">
                            {post.category && (
                              <span className="text-[10px] font-bold uppercase tracking-wider text-[#1D4ED8] bg-[#0d1a2e] px-1.5 py-0.5 rounded">
                                {post.category}
                              </span>
                            )}
                            <span className="text-[11px] text-[#555]">{post.author_name}</span>
                            <span className="text-[11px] text-[#444]">Published {formatDate(post.wp_published_at)}</span>
                            <span className="text-[11px] text-[#333]">Imported {formatDate(post.imported_at)}</span>
                          </div>
                        </div>
                        <div className="flex items-center gap-2 flex-shrink-0">
                          <a
                            href={`https://www.avbeat.com/${post.wp_slug}`}
                            target="_blank"
                            rel="noopener noreferrer"
                            className="text-[#555] hover:text-[#1D4ED8] transition-colors p-1"
                            title="View on avbeat.com">
                            <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                              <path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6" /><polyline points="15 3 21 3 21 9" /><line x1="10" y1="14" x2="21" y2="3" />
                            </svg>
                          </a>
                          <button
                            onClick={() => handleDelete(post.id)}
                            disabled={deletingId === post.id}
                            className="text-[#555] hover:text-red-400 transition-colors p-1 disabled:opacity-50"
                            title="Delete post">
                            {deletingId === post.id ? (
                              <div className="w-3.5 h-3.5 border border-red-400 border-t-transparent rounded-full animate-spin" />
                            ) : (
                              <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                                <polyline points="3 6 5 6 21 6" /><path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6" /><path d="M10 11v6" /><path d="M14 11v6" /><path d="M9 6V4a1 1 0 0 1 1-1h4a1 1 0 0 1 1 1v2" />
                              </svg>
                            )}
                          </button>
                        </div>
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>
        )}

        {/* Logs Tab */}
        {activeTab === 'logs' && (
          <div>
            {loadingData ? (
              <div className="flex items-center justify-center py-16">
                <div className="w-6 h-6 border-2 border-[#1D4ED8] border-t-transparent rounded-full animate-spin" />
              </div>
            ) : logs.length === 0 ? (
              <div className="text-center py-16 bg-[#111] border border-[#DCE6F2] rounded-lg">
                <p className="text-[#555] text-sm">No import history yet.</p>
              </div>
            ) : (
              <div className="space-y-2">
                {logs.map((log) => (
                  <div key={log.id} className="bg-[#111] border border-[#DCE6F2] rounded-lg p-4">
                    <div className="flex items-start justify-between gap-4">
                      <div className="flex items-center gap-2">
                        {log.status === 'completed' ? (
                          <span className="w-2 h-2 rounded-full bg-green-400 flex-shrink-0" />
                        ) : log.status === 'failed' ? (
                          <span className="w-2 h-2 rounded-full bg-red-400 flex-shrink-0" />
                        ) : (
                          <span className="w-2 h-2 rounded-full bg-yellow-400 flex-shrink-0 animate-pulse" />
                        )}
                        <span className={`text-xs font-bold uppercase tracking-wider ${
                          log.status === 'completed' ? 'text-green-400' :
                          log.status === 'failed' ? 'text-red-400' : 'text-yellow-400'
                        }`}>
                          {log.status}
                        </span>
                      </div>
                      <span className="text-[11px] text-[#444]">{formatDate(log.started_at)}</span>
                    </div>

                    {log.status !== 'running' && (
                      <div className="grid grid-cols-2 sm:grid-cols-4 gap-2 mt-3">
                        {[
                          { label: 'Fetched', value: log.total_fetched },
                          { label: 'Imported', value: log.total_imported },
                          { label: 'Skipped', value: log.total_skipped },
                          { label: 'Errors', value: log.total_errors },
                        ].map((stat) => (
                          <div key={stat.label} className="bg-[#F8FAFC] rounded p-2 text-center">
                            <p className="text-base font-bold text-[#cccccc]">{stat.value}</p>
                            <p className="text-[10px] text-[#444] uppercase tracking-wider">{stat.label}</p>
                          </div>
                        ))}
                      </div>
                    )}

                    {log.error_message && (
                      <p className="mt-2 text-xs text-red-400 bg-[#1a0a0a] rounded px-2 py-1.5">{log.error_message}</p>
                    )}
                  </div>
                ))}
              </div>
            )}
          </div>
        )}
      </div>
    </div>
  );
}
