/**
 * Cookie Banner — Embed Code Generation (CSS, HTML, JS)
 *
 * Generates the embeddable cookie banner code from configuration.
 */

import {
  CookieBannerConfig,
  CookieBannerStyling,
  CookieBannerEmbedCode,
  LocalizedText,
  SupportedLanguage,
} from '../types'

// =============================================================================
// MAIN EXPORT
// =============================================================================

export function generateEmbedCode(
  config: CookieBannerConfig,
  privacyPolicyUrl: string = '/datenschutz'
): CookieBannerEmbedCode {
  const css = generateCSS(config.styling)
  const html = generateHTML(config, privacyPolicyUrl)
  const js = generateJS(config)

  const scriptTag = `<script src="/cookie-banner.js" data-tenant="${config.tenantId}"></script>`

  return { html, css, js, scriptTag }
}

// =============================================================================
// CSS GENERATION
// =============================================================================

function generateCSS(styling: CookieBannerStyling): string {
  const positionStyles: Record<string, string> = {
    BOTTOM: 'bottom: 0; left: 0; right: 0;',
    TOP: 'top: 0; left: 0; right: 0;',
    CENTER: 'top: 50%; left: 50%; transform: translate(-50%, -50%);',
  }

  const isDark = styling.theme === 'DARK'
  const bgColor = isDark ? '#1e293b' : styling.backgroundColor || '#ffffff'
  const textColor = isDark ? '#f1f5f9' : styling.textColor || '#1e293b'
  const borderColor = isDark ? 'rgba(255,255,255,0.1)' : 'rgba(0,0,0,0.1)'

  return `
/* Cookie Banner Styles */
.cookie-banner-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.cookie-banner-overlay.active {
  opacity: 1;
  visibility: visible;
}

.cookie-banner {
  position: fixed;
  ${positionStyles[styling.position]}
  z-index: 9999;
  background: ${bgColor};
  color: ${textColor};
  border-radius: ${styling.borderRadius || 12}px;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
  padding: 24px;
  max-width: ${styling.maxWidth}px;
  margin: ${styling.position === 'CENTER' ? '0' : '16px'};
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  transform: translateY(100%);
  opacity: 0;
  transition: all 0.3s ease;
}

.cookie-banner.active {
  transform: translateY(0);
  opacity: 1;
}

.cookie-banner-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.cookie-banner-description {
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 16px;
  opacity: 0.8;
}

.cookie-banner-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.cookie-banner-btn {
  flex: 1;
  min-width: 120px;
  padding: 12px 20px;
  border-radius: ${(styling.borderRadius || 12) / 2}px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.cookie-banner-btn-primary {
  background: ${styling.primaryColor};
  color: white;
}

.cookie-banner-btn-primary:hover {
  filter: brightness(1.1);
}

.cookie-banner-btn-secondary {
  background: ${styling.secondaryColor || borderColor};
  color: ${textColor};
}

.cookie-banner-btn-secondary:hover {
  filter: brightness(0.95);
}

.cookie-banner-link {
  display: block;
  margin-top: 16px;
  font-size: 12px;
  color: ${styling.primaryColor};
  text-decoration: none;
}

.cookie-banner-link:hover {
  text-decoration: underline;
}

/* Category Details */
.cookie-banner-details {
  margin-top: 16px;
  border-top: 1px solid ${borderColor};
  padding-top: 16px;
  display: none;
}

.cookie-banner-details.active {
  display: block;
}

.cookie-banner-category {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid ${borderColor};
}

.cookie-banner-category:last-child {
  border-bottom: none;
}

.cookie-banner-category-info {
  flex: 1;
}

.cookie-banner-category-name {
  font-weight: 500;
  font-size: 14px;
}

.cookie-banner-category-desc {
  font-size: 12px;
  opacity: 0.7;
  margin-top: 4px;
}

.cookie-banner-toggle {
  position: relative;
  width: 48px;
  height: 28px;
  background: ${borderColor};
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.cookie-banner-toggle.active {
  background: ${styling.primaryColor};
}

.cookie-banner-toggle.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.cookie-banner-toggle::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  transition: all 0.2s ease;
}

.cookie-banner-toggle.active::after {
  left: 24px;
}

@media (max-width: 640px) {
  .cookie-banner {
    margin: 0;
    border-radius: ${styling.position === 'CENTER' ? (styling.borderRadius || 12) : 0}px;
    max-width: 100%;
  }

  .cookie-banner-buttons {
    flex-direction: column;
  }

  .cookie-banner-btn {
    width: 100%;
  }
}
`.trim()
}

// =============================================================================
// HTML GENERATION
// =============================================================================

function generateHTML(config: CookieBannerConfig, privacyPolicyUrl: string): string {
  const categoriesHTML = config.categories
    .map((cat) => {
      const isRequired = cat.isRequired
      return `
      <div class="cookie-banner-category" data-category="${cat.id}">
        <div class="cookie-banner-category-info">
          <div class="cookie-banner-category-name">${cat.name.de}</div>
          <div class="cookie-banner-category-desc">${cat.description.de}</div>
        </div>
        <div class="cookie-banner-toggle ${cat.defaultEnabled ? 'active' : ''} ${isRequired ? 'disabled' : ''}"
             data-category="${cat.id}"
             data-required="${isRequired}"></div>
      </div>
    `
    })
    .join('')

  return `
<div class="cookie-banner-overlay" id="cookieBannerOverlay"></div>
<div class="cookie-banner" id="cookieBanner" role="dialog" aria-labelledby="cookieBannerTitle" aria-modal="true">
  <div class="cookie-banner-title" id="cookieBannerTitle">${config.texts.title.de}</div>
  <div class="cookie-banner-description">${config.texts.description.de}</div>

  <div class="cookie-banner-buttons">
    <button class="cookie-banner-btn cookie-banner-btn-secondary" id="cookieBannerReject">
      ${config.texts.rejectAll.de}
    </button>
    <button class="cookie-banner-btn cookie-banner-btn-secondary" id="cookieBannerCustomize">
      ${config.texts.customize.de}
    </button>
    <button class="cookie-banner-btn cookie-banner-btn-primary" id="cookieBannerAccept">
      ${config.texts.acceptAll.de}
    </button>
  </div>

  <div class="cookie-banner-details" id="cookieBannerDetails">
    ${categoriesHTML}
    <div class="cookie-banner-buttons" style="margin-top: 16px;">
      <button class="cookie-banner-btn cookie-banner-btn-primary" id="cookieBannerSave">
        ${config.texts.save.de}
      </button>
    </div>
  </div>

  <a href="${privacyPolicyUrl}" class="cookie-banner-link" target="_blank">
    ${config.texts.privacyPolicyLink.de}
  </a>
</div>
`.trim()
}

// =============================================================================
// JS GENERATION
// =============================================================================

function generateJS(config: CookieBannerConfig): string {
  const categoryIds = config.categories.map((c) => c.id)
  const requiredCategories = config.categories.filter((c) => c.isRequired).map((c) => c.id)

  return `
(function() {
  'use strict';

  const COOKIE_NAME = 'cookie_consent';
  const COOKIE_EXPIRY_DAYS = 365;
  const CATEGORIES = ${JSON.stringify(categoryIds)};
  const REQUIRED_CATEGORIES = ${JSON.stringify(requiredCategories)};

  function getConsent() {
    const cookie = document.cookie.split('; ').find(row => row.startsWith(COOKIE_NAME + '='));
    if (!cookie) return null;
    try {
      return JSON.parse(decodeURIComponent(cookie.split('=')[1]));
    } catch {
      return null;
    }
  }

  function saveConsent(consent) {
    const date = new Date();
    date.setTime(date.getTime() + (COOKIE_EXPIRY_DAYS * 24 * 60 * 60 * 1000));
    document.cookie = COOKIE_NAME + '=' + encodeURIComponent(JSON.stringify(consent)) +
                      ';expires=' + date.toUTCString() +
                      ';path=/;SameSite=Lax';
    window.dispatchEvent(new CustomEvent('cookieConsentUpdated', { detail: consent }));
  }

  function hasConsent(category) {
    const consent = getConsent();
    if (!consent) return REQUIRED_CATEGORIES.includes(category);
    return consent[category] === true;
  }

  function initBanner() {
    const banner = document.getElementById('cookieBanner');
    const overlay = document.getElementById('cookieBannerOverlay');
    const details = document.getElementById('cookieBannerDetails');

    if (!banner) return;

    const consent = getConsent();
    if (consent) return;

    setTimeout(() => {
      banner.classList.add('active');
      overlay.classList.add('active');
    }, 500);

    document.getElementById('cookieBannerAccept')?.addEventListener('click', () => {
      const consent = {};
      CATEGORIES.forEach(cat => consent[cat] = true);
      saveConsent(consent);
      closeBanner();
    });

    document.getElementById('cookieBannerReject')?.addEventListener('click', () => {
      const consent = {};
      CATEGORIES.forEach(cat => consent[cat] = REQUIRED_CATEGORIES.includes(cat));
      saveConsent(consent);
      closeBanner();
    });

    document.getElementById('cookieBannerCustomize')?.addEventListener('click', () => {
      details.classList.toggle('active');
    });

    document.getElementById('cookieBannerSave')?.addEventListener('click', () => {
      const consent = {};
      CATEGORIES.forEach(cat => {
        const toggle = document.querySelector('.cookie-banner-toggle[data-category="' + cat + '"]');
        consent[cat] = toggle?.classList.contains('active') || REQUIRED_CATEGORIES.includes(cat);
      });
      saveConsent(consent);
      closeBanner();
    });

    document.querySelectorAll('.cookie-banner-toggle').forEach(toggle => {
      if (toggle.dataset.required === 'true') return;
      toggle.addEventListener('click', () => {
        toggle.classList.toggle('active');
      });
    });

    overlay?.addEventListener('click', () => {
      // Don't close - user must make a choice
    });
  }

  function closeBanner() {
    const banner = document.getElementById('cookieBanner');
    const overlay = document.getElementById('cookieBannerOverlay');
    banner?.classList.remove('active');
    overlay?.classList.remove('active');
  }

  window.CookieConsent = {
    getConsent,
    saveConsent,
    hasConsent,
    show: () => {
      document.getElementById('cookieBanner')?.classList.add('active');
      document.getElementById('cookieBannerOverlay')?.classList.add('active');
    },
    hide: closeBanner
  };

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', initBanner);
  } else {
    initBanner();
  }
})();
`.trim()
}
