/**
 * Kalender & Freigaben — Plane, manage und genehmige Content über alle Plattformen
 * Referenz: docs/design-references/screen-kalender.png
 */

import { useState } from 'react';
import { ChevronLeft, ChevronRight, Plus, Filter, MoreHorizontal } from 'lucide-react';

const CHANNELS = [
  { name: 'TikTok', icon: '🎵', color: '#00d4ff', count: 5 },
  { name: 'Instagram', icon: '📸', color: '#e1306c', count: 5 },
  { name: 'LinkedIn', icon: '💼', color: '#0077b5', count: 4 },
  { name: 'X (Twitter)', icon: '✗', color: '#94a3b8', count: 5 },
  { name: 'YouTube Shorts', icon: '▶', color: '#ff0000', count: 5 },
];

const DAYS = ['Mo 26. Mai', 'Di 27. Mai', 'Mi 28. Mai', 'Do 29. Mai', 'Fr 30. Mai', 'Sa 31. Mai', 'So 1. Jun'];

const STATUS_COLORS: Record<string, { bg: string; text: string }> = {
  Review: { bg: 'oklch(0.75 0.15 75 / 0.2)', text: '#f59e0b' },
  Geplant: { bg: 'oklch(0.82 0.18 210 / 0.15)', text: '#00d4ff' },
  Freigegeben: { bg: 'oklch(0.65 0.15 165 / 0.2)', text: '#10b981' },
  Veröffentlicht: { bg: 'oklch(0.65 0.15 165 / 0.1)', text: '#10b981' },
};

const CALENDAR_DATA: Record<string, Record<string, Array<{ time: string; title: string; status: string }>>> = {
  TikTok: {
    'Mo 26. Mai': [{ time: '09:00', title: 'Shelly Plug S Gen3', status: 'Review' }],
    'Di 27. Mai': [{ time: '18:30', title: 'Kitchen Trends 2025', status: 'Geplant' }],
    'Mi 28. Mai': [{ time: '12:00', title: 'Energy Saving Tip', status: 'Freigegeben' }],
    'Do 29. Mai': [{ time: '19:15', title: 'Automation Hack', status: 'Review' }],
    'Fr 30. Mai': [{ time: '17:45', title: 'Weekend Setup', status: 'Freigegeben' }],
    'Sa 31. Mai': [{ time: '11:30', title: 'Smart Home Tour', status: 'Veröffentlicht' }],
  },
  Instagram: {
    'Mo 26. Mai': [{ time: '10:30', title: 'New Collection', status: 'Geplant' }],
    'Di 27. Mai': [{ time: '15:00', title: 'Behind the Scenes', status: 'Review' }],
    'Mi 28. Mai': [{ time: '11:00', title: 'Customer Favorite', status: 'Freigegeben' }],
    'Do 29. Mai': [{ time: '16:30', title: 'Giveaway Alert', status: 'Geplant' }],
    'Fr 30. Mai': [{ time: '12:15', title: 'Lifestyle Post', status: 'Veröffentlicht' }],
    'Sa 31. Mai': [{ time: '10:00', title: 'Story Series', status: 'Veröffentlicht' }],
  },
  LinkedIn: {
    'Mo 26. Mai': [{ time: '08:30', title: 'Industry Insights', status: 'Geplant' }],
    'Di 27. Mai': [{ time: '12:00', title: 'Product Launch', status: 'Freigegeben' }],
    'Mi 28. Mai': [{ time: '09:15', title: 'Case Study', status: 'Freigegeben' }],
    'Do 29. Mai': [{ time: '13:00', title: 'Market Update', status: 'Geplant' }],
    'Fr 30. Mai': [{ time: '09:30', title: 'Thought Leadership', status: 'Freigegeben' }],
  },
  'X (Twitter)': {
    'Mo 26. Mai': [{ time: '09:45', title: 'Quick Tip', status: 'Geplant' }],
    'Di 27. Mai': [{ time: '14:20', title: 'Tech Update', status: 'Geplant' }],
    'Mi 28. Mai': [{ time: '11:15', title: 'Poll', status: 'Review' }],
    'Do 29. Mai': [{ time: '08:50', title: 'Thread', status: 'Geplant' }],
    'Fr 30. Mai': [{ time: '16:00', title: 'News Flash', status: 'Freigegeben' }],
  },
  'YouTube Shorts': {
    'Mo 26. Mai': [{ time: '17:00', title: 'Unboxing', status: 'Geplant' }],
    'Di 27. Mai': [{ time: '18:00', title: 'Top 3 Features', status: 'Review' }],
    'Mi 28. Mai': [{ time: '17:30', title: 'How-To', status: 'Freigegeben' }],
    'Do 29. Mai': [{ time: '18:30', title: 'Comparison', status: 'Geplant' }],
    'Fr 30. Mai': [{ time: '09:00', title: 'User Story', status: 'Freigegeben' }],
    'Sa 31. Mai': [{ time: '12:00', title: 'Quick Hack', status: 'Veröffentlicht' }],
  },
};

const APPROVAL_QUEUE = [
  { priority: 'Hoch', title: 'Automation Hack in 60 Sekunden', platform: 'TikTok', product: 'Shelly Plus 2PM', affiliate: true, scheduled: '29. Mai, 19:15', by: 'Lena M.', status: 'Review' },
  { priority: 'Hoch', title: 'Behind the Scenes – Studio Tour', platform: 'Instagram', product: 'Shelly Wall Display', affiliate: true, scheduled: '27. Mai, 15:00', by: 'Tim S.', status: 'Review' },
  { priority: 'Mittel', title: 'Case Study: Energie sparen', platform: 'LinkedIn', product: 'Shelly Plug S Gen3', affiliate: false, scheduled: '28. Mai, 09:15', by: 'Anna K.', status: 'Review' },
  { priority: 'Mittel', title: 'Top 3 Features – Shelly Pro 4PM', platform: 'YouTube Shorts', product: 'Shelly Pro 4PM', affiliate: true, scheduled: '27. Mai, 18:00', by: 'Mark D.', status: 'Review' },
  { priority: 'Niedrig', title: 'Quick Tip: Szene erstellen', platform: 'X (Twitter)', product: 'Shelly App', affiliate: false, scheduled: '28. Mai, 11:15', by: 'Sarah L.', status: 'Review' },
  { priority: 'Niedrig', title: 'Giveaway: Smart Home Bundle', platform: 'Instagram', product: 'Bundle Pack', affiliate: true, scheduled: '29. Mai, 16:30', by: 'Tim S.', status: 'Geplant' },
  { priority: 'Niedrig', title: 'Market Update Q2/2025', platform: 'LinkedIn', product: '—', affiliate: false, scheduled: '29. Mai, 13:00', by: 'Anna K.', status: 'Geplant' },
];

const PRIORITY_COLORS: Record<string, { bg: string; text: string }> = {
  Hoch: { bg: 'oklch(0.62 0.22 25 / 0.15)', text: '#ef4444' },
  Mittel: { bg: 'oklch(0.75 0.15 75 / 0.15)', text: '#f59e0b' },
  Niedrig: { bg: 'oklch(0.82 0.18 210 / 0.1)', text: '#64748b' },
};

const PLATFORM_ICONS: Record<string, string> = {
  TikTok: '🎵', Instagram: '📸', LinkedIn: '💼', 'X (Twitter)': '✗', 'YouTube Shorts': '▶',
};

export default function Calendar() {
  const [view, setView] = useState<'Woche' | 'Monat'>('Woche');

  return (
    <div className="p-5 animate-fade-in-up space-y-4">
      {/* Header */}
      <div className="atlas-page-header-row">
        <div>
          <h1 className="text-xl font-bold" style={{ fontFamily: 'var(--font-display)', color: 'var(--foreground)' }}>
            Kalender & Freigaben
          </h1>
          <p className="text-sm mt-0.5" style={{ color: 'var(--muted-foreground)' }}>
            Plane, manage und genehmige Content über alle Plattformen.
          </p>
        </div>
        <div className="atlas-header-controls">
          <div className="flex items-center gap-1 px-2 py-1.5 rounded" style={{ background: 'var(--atlas-surface)', border: '1px solid var(--atlas-border)' }}>
            <button className="atlas-btn-ghost p-0.5"><ChevronLeft size={13} /></button>
            <span className="text-xs" style={{ color: 'var(--foreground)' }}>26. Mai – 1. Jun</span>
            <button className="atlas-btn-ghost p-0.5"><ChevronRight size={13} /></button>
          </div>
          <div className="flex rounded overflow-hidden" style={{ border: '1px solid var(--atlas-border)' }}>
            {(['Woche', 'Monat'] as const).map(v => (
              <button
                key={v}
                onClick={() => setView(v)}
                className="px-3 py-1.5 text-xs transition-colors"
                style={{
                  background: view === v ? 'oklch(0.82 0.18 210 / 0.12)' : 'var(--atlas-surface)',
                  color: view === v ? 'var(--atlas-cyan)' : 'var(--muted-foreground)',
                }}
              >
                {v}
              </button>
            ))}
          </div>
          <button className="atlas-btn-ghost p-1.5"><Filter size={14} /></button>
        </div>
      </div>

      {/* KPI Bar */}
      <div className="grid grid-cols-2 lg:grid-cols-4 gap-3">
        {[
          { label: 'Geplante Beiträge', value: '24', trend: '↑ 14% vs. letzte Woche', color: '#60a5fa' },
          { label: 'Ausstehende Freigaben', value: '7', trend: '↑ 2 vs. letzte Woche', color: '#a78bfa' },
          { label: 'Ø Veröffentlichungszeit', value: '14:32', trend: 'Beste Zeit: 18:00', color: '#10b981' },
          { label: 'Proj. Affiliate-Umsatz', value: '€12.430', trend: '↑ 24% vs. letzte Woche', color: '#00d4ff' },
        ].map((kpi, i) => (
          <div key={i} className="atlas-kpi-card">
            <div className="text-xs mb-1" style={{ color: 'var(--muted-foreground)' }}>{kpi.label}</div>
            <div className="text-xl font-bold" style={{ fontFamily: 'var(--font-mono)', color: kpi.color }}>{kpi.value}</div>
            <div className="text-xs mt-1" style={{ color: 'var(--muted-foreground)' }}>{kpi.trend}</div>
          </div>
        ))}
      </div>

      {/* Content Kalender */}
      <div className="atlas-card overflow-hidden">
        <div className="p-3 flex items-center justify-between" style={{ borderBottom: '1px solid var(--atlas-border)' }}>
          <h2 className="text-sm font-semibold" style={{ fontFamily: 'var(--font-display)', color: 'var(--foreground)' }}>Content Kalender</h2>
        </div>
        <div className="overflow-x-auto">
          <table style={{ width: '100%', borderCollapse: 'collapse', minWidth: '900px' }}>
            <thead>
              <tr style={{ borderBottom: '1px solid var(--atlas-border)' }}>
                <th style={{ width: '140px', padding: '8px 12px', textAlign: 'left' }}>
                  <span className="text-xs" style={{ color: 'var(--muted-foreground)' }}>Kanal</span>
                </th>
                {DAYS.map(day => (
                  <th key={day} style={{ padding: '8px 8px', textAlign: 'left', minWidth: '120px' }}>
                    <span className="text-xs" style={{ color: 'var(--muted-foreground)', fontFamily: 'var(--font-mono)' }}>{day}</span>
                  </th>
                ))}
                <th style={{ width: '40px' }} />
              </tr>
            </thead>
            <tbody>
              {CHANNELS.map((channel, ci) => (
                <tr key={channel.name} style={{ borderBottom: ci < CHANNELS.length - 1 ? '1px solid var(--atlas-border)' : 'none' }}>
                  <td style={{ padding: '8px 12px', verticalAlign: 'top' }}>
                    <div className="flex items-center gap-2">
                      <span style={{ fontSize: '14px' }}>{channel.icon}</span>
                      <div>
                        <div className="text-xs font-medium" style={{ color: 'var(--foreground)' }}>{channel.name}</div>
                        <div className="text-xs" style={{ color: 'var(--muted-foreground)', fontSize: '0.6rem' }}>{channel.count} Beiträge</div>
                      </div>
                    </div>
                  </td>
                  {DAYS.map(day => {
                    const items = CALENDAR_DATA[channel.name]?.[day] || [];
                    return (
                      <td key={day} style={{ padding: '6px 8px', verticalAlign: 'top' }}>
                        {items.map((item, ii) => (
                          <div
                            key={ii}
                            className="rounded p-1.5 mb-1 cursor-pointer"
                            style={{
                              background: STATUS_COLORS[item.status]?.bg || 'var(--atlas-surface)',
                              border: `1px solid ${STATUS_COLORS[item.status]?.text || 'var(--atlas-border)'}30`,
                            }}
                          >
                            <div className="text-xs font-mono" style={{ color: 'var(--muted-foreground)', fontSize: '0.6rem' }}>{item.time}</div>
                            <div className="text-xs truncate" style={{ color: 'var(--foreground)', fontSize: '0.6875rem' }}>{item.title}</div>
                            <span
                              className="text-xs"
                              style={{ color: STATUS_COLORS[item.status]?.text, fontSize: '0.6rem' }}
                            >
                              {item.status}
                            </span>
                          </div>
                        ))}
                        {items.length === 0 && (
                          <div className="text-center py-2">
                            <span style={{ color: 'var(--atlas-border)', fontSize: '16px' }}>—</span>
                          </div>
                        )}
                      </td>
                    );
                  })}
                  <td style={{ padding: '6px 8px', verticalAlign: 'top' }}>
                    <button className="p-1 rounded" style={{ color: 'var(--muted-foreground)' }}>
                      <Plus size={12} />
                    </button>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      </div>

      {/* Freigaben Queue */}
      <div className="atlas-card overflow-hidden">
        <div className="p-3 flex items-center justify-between" style={{ borderBottom: '1px solid var(--atlas-border)' }}>
          <div className="flex items-center gap-2">
            <h2 className="text-sm font-semibold" style={{ fontFamily: 'var(--font-display)', color: 'var(--foreground)' }}>
              Freigaben-Queue ({APPROVAL_QUEUE.length})
            </h2>
          </div>
          <div className="flex items-center gap-2">
            <select className="text-xs px-2 py-1 rounded" style={{ background: 'var(--atlas-navy)', border: '1px solid var(--atlas-border)', color: 'var(--foreground)' }}>
              <option>Alle Plattformen</option>
            </select>
            <select className="text-xs px-2 py-1 rounded" style={{ background: 'var(--atlas-navy)', border: '1px solid var(--atlas-border)', color: 'var(--foreground)' }}>
              <option>Sortieren: Priorität</option>
            </select>
          </div>
        </div>
        <table style={{ width: '100%', borderCollapse: 'collapse' }}>
          <thead>
            <tr style={{ borderBottom: '1px solid var(--atlas-border)' }}>
              {['Priorität', 'Vorschau', 'Titel', 'Plattform', 'Produkt', 'Affiliate', 'Geplant für', 'Erstellt von', 'Status', 'Aktionen'].map(h => (
                <th key={h} style={{ padding: '8px 12px', textAlign: 'left' }}>
                  <span className="text-xs" style={{ color: 'var(--muted-foreground)', fontFamily: 'var(--font-body)' }}>{h}</span>
                </th>
              ))}
            </tr>
          </thead>
          <tbody>
            {APPROVAL_QUEUE.map((item, i) => (
              <tr key={i} style={{ borderBottom: i < APPROVAL_QUEUE.length - 1 ? '1px solid var(--atlas-border)' : 'none' }}>
                <td style={{ padding: '8px 12px' }}>
                  <span
                    className="text-xs px-2 py-0.5 rounded"
                    style={{ background: PRIORITY_COLORS[item.priority].bg, color: PRIORITY_COLORS[item.priority].text, border: `1px solid ${PRIORITY_COLORS[item.priority].text}30` }}
                  >
                    {item.priority}
                  </span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <div className="w-8 h-8 rounded" style={{ background: 'var(--atlas-border)' }} />
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <span className="text-xs" style={{ color: 'var(--foreground)' }}>{item.title}</span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <span className="text-xs">{PLATFORM_ICONS[item.platform]} {item.platform}</span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <span className="text-xs" style={{ color: 'var(--muted-foreground)' }}>{item.product}</span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <span className="text-xs" style={{ color: item.affiliate ? 'var(--atlas-green)' : 'var(--muted-foreground)' }}>
                    {item.affiliate ? 'Ja' : 'Nein'}
                  </span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <span className="text-xs" style={{ color: 'var(--foreground)', fontFamily: 'var(--font-mono)' }}>{item.scheduled}</span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <span className="text-xs" style={{ color: 'var(--muted-foreground)' }}>{item.by}</span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <span
                    className="text-xs px-2 py-0.5 rounded"
                    style={{ background: STATUS_COLORS[item.status]?.bg, color: STATUS_COLORS[item.status]?.text }}
                  >
                    {item.status}
                  </span>
                </td>
                <td style={{ padding: '8px 12px' }}>
                  <div className="flex items-center gap-1">
                    <button className="text-xs px-2 py-0.5 rounded" style={{ background: 'oklch(0.65 0.15 165 / 0.15)', color: 'var(--atlas-green)', border: '1px solid oklch(0.65 0.15 165 / 0.25)' }}>
                      Freigeben
                    </button>
                    <button className="text-xs px-2 py-0.5 rounded" style={{ background: 'var(--atlas-navy)', color: 'var(--muted-foreground)', border: '1px solid var(--atlas-border)' }}>
                      Bearbeiten
                    </button>
                    <button className="p-1" style={{ color: 'var(--muted-foreground)' }}><MoreHorizontal size={12} /></button>
                  </div>
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </div>
  );
}
