import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';

import '../theme/app_theme.dart';
import '../utils/app_branding.dart';
import '../widgets/custom_app_bar.dart';
import '../widgets/docverse_brand.dart';

class PrivacyPolicyScreen extends StatelessWidget {
  const PrivacyPolicyScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final bodyStyle = Theme.of(context).textTheme.bodyLarge;
    final headingStyle = Theme.of(context).textTheme.titleLarge;

    return Scaffold(
      appBar: const DocVerseAppBar(
        title: 'Privacy Policy',
        showLogo: false,
      ),
      body: ListView(
        padding: const EdgeInsets.all(AppSpacing.xl),
        children: [
          const Center(
            child: DocVerseLogo(
              iconSize: 44,
              stacked: true,
            ),
          ),
          const SizedBox(height: AppSpacing.xl),
          Text(AppBranding.name, style: headingStyle),
          const SizedBox(height: AppSpacing.sm),
          Text(
            '${AppBranding.name} is built for private reading. What you open, read, '
            'and save stays on your device — not on our servers, not in the cloud, '
            'and not with anyone else. You are in full control of your documents.',
            style: bodyStyle,
          ),
          const SizedBox(height: AppSpacing.xl),
          Text('No One Can Read Your Documents', style: headingStyle),
          const SizedBox(height: AppSpacing.sm),
          Text(
            'We cannot read your files. ${AppBranding.name} has no backend, no user accounts, '
            'and no way to access what you import. There is no upload step, no remote '
            'storage, and no team on our side that can view your content. Your reading '
            'history, bookmarks, and files exist only in local storage on your phone, '
            'tablet, or browser.',
            style: bodyStyle,
          ),
          const SizedBox(height: AppSpacing.xl),
          Text('Read & Save Whatever You Want', style: headingStyle),
          const SizedBox(height: AppSpacing.sm),
          Text(
            'Import PDFs, Word, text, RTF, and Markdown — read them offline, '
            'bookmark your place, and keep them as long as you like. Delete them anytime. '
            'Share a file only when you explicitly choose to, using your device\'s '
            'share sheet. Until then, your documents never leave your device.',
            style: bodyStyle,
          ),
          const SizedBox(height: AppSpacing.xl),
          Text('Our Privacy Commitments', style: headingStyle),
          const SizedBox(height: AppSpacing.md),
          _bullet(
            context,
            'No account, login, or sign-up required',
          ),
          _bullet(context, 'No analytics, tracking, or advertising'),
          _bullet(context, 'No data collection — zero personal data sent to us'),
          _bullet(context, 'No cloud sync — files stay in local device storage'),
          _bullet(
            context,
            'Your name and preferences saved only on this device',
          ),
          _bullet(
            context,
            'Internet used only when you tap Share — never automatically',
          ),
          _bullet(
            context,
            'No third-party SDKs that harvest your reading behavior',
          ),
          _bullet(
            context,
            'Works fully offline — airplane mode friendly',
          ),
          const SizedBox(height: AppSpacing.xl),
          Text('Your Rights', style: headingStyle),
          const SizedBox(height: AppSpacing.sm),
          Text(
            'You own your data. You can clear all imported files from Settings at any '
            'time. Uninstalling the app removes local storage from your device. Because '
            'we never receive your documents, there is nothing for us to delete, sell, '
            'or share on your behalf.',
            style: bodyStyle,
          ),
          const SizedBox(height: AppSpacing.xl),
          Container(
            padding: const EdgeInsets.all(AppSpacing.lg),
            decoration: BoxDecoration(
              color: Theme.of(context).colorScheme.primary.withValues(alpha: 0.08),
              borderRadius: BorderRadius.circular(AppRadius.medium),
              border: Border.all(
                color: Theme.of(context).colorScheme.primary.withValues(alpha: 0.2),
              ),
            ),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Icon(
                  Icons.verified_user_rounded,
                  color: Theme.of(context).colorScheme.primary,
                  size: 28,
                ),
                const SizedBox(width: AppSpacing.md),
                Expanded(
                  child: Text(
                    '${AppBranding.name}. Read with confidence. '
                    'Your documents are yours alone.',
                    style: GoogleFonts.inter(
                      fontSize: 14,
                      fontWeight: FontWeight.w500,
                      height: 1.5,
                      color: Theme.of(context).colorScheme.onSurface,
                    ),
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: AppSpacing.xl),
          Center(
            child: Text(
              '${AppBranding.name}\n${AppBranding.versionSummary}',
              textAlign: TextAlign.center,
              style: Theme.of(context).textTheme.labelMedium?.copyWith(
                    color: Theme.of(context).colorScheme.onSurfaceVariant,
                  ),
            ),
          ),
          const SizedBox(height: AppSpacing.xxl),
        ],
      ),
    );
  }

  Widget _bullet(BuildContext context, String text) {
    return Padding(
      padding: const EdgeInsets.only(bottom: AppSpacing.sm),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.only(top: 6),
            child: Icon(
              Icons.check_circle_rounded,
              size: 18,
              color: Theme.of(context).colorScheme.primary,
            ),
          ),
          const SizedBox(width: AppSpacing.sm),
          Expanded(
            child: Text(text, style: Theme.of(context).textTheme.bodyLarge),
          ),
        ],
      ),
    );
  }
}