import 'dart:io';

import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:immich_mobile/extensions/build_context_extensions.dart';
import 'package:timezone/timezone.dart';
import 'package:immich_mobile/modules/asset_viewer/ui/description_input.dart';
import 'package:immich_mobile/modules/map/ui/map_thumbnail.dart';
import 'package:immich_mobile/shared/models/asset.dart';
import 'package:immich_mobile/shared/models/exif_info.dart';
import 'package:immich_mobile/shared/providers/asset.provider.dart';
import 'package:immich_mobile/shared/ui/drag_sheet.dart';
import 'package:latlong2/latlong.dart';
import 'package:immich_mobile/utils/bytes_units.dart';
import 'package:url_launcher/url_launcher.dart';

class ExifBottomSheet extends HookConsumerWidget {
  final Asset asset;

  const ExifBottomSheet({Key? key, required this.asset}) : super(key: key);

  bool hasCoordinates(ExifInfo? exifInfo) =>
      exifInfo != null &&
      exifInfo.latitude != null &&
      exifInfo.longitude != null &&
      exifInfo.latitude != 0 &&
      exifInfo.longitude != 0;

  String formatTimeZone(Duration d) =>
      "GMT${d.isNegative ? '-' : '+'}${d.inHours.abs().toString().padLeft(2, '0')}:${d.inMinutes.abs().remainder(60).toString().padLeft(2, '0')}";

  String get formattedDateTime {
    DateTime dt = asset.fileCreatedAt.toLocal();
    String? timeZone;
    if (asset.exifInfo?.dateTimeOriginal != null) {
      dt = asset.exifInfo!.dateTimeOriginal!;
      if (asset.exifInfo?.timeZone != null) {
        dt = dt.toUtc();
        try {
          final location = getLocation(asset.exifInfo!.timeZone!);
          dt = TZDateTime.from(dt, location);
        } on LocationNotFoundException {
          RegExp re = RegExp(
            r'^utc(?:([+-]\d{1,2})(?::(\d{2}))?)?$',
            caseSensitive: false,
          );
          final m = re.firstMatch(asset.exifInfo!.timeZone!);
          if (m != null) {
            final duration = Duration(
              hours: int.parse(m.group(1) ?? '0'),
              minutes: int.parse(m.group(2) ?? '0'),
            );
            dt = dt.add(duration);
            timeZone = formatTimeZone(duration);
          }
        }
      }
    }

    final date = DateFormat.yMMMEd().format(dt);
    final time = DateFormat.jm().format(dt);
    timeZone ??= formatTimeZone(dt.timeZoneOffset);

    return '$date • $time $timeZone';
  }

  Future<Uri?> _createCoordinatesUri(ExifInfo? exifInfo) async {
    if (!hasCoordinates(exifInfo)) {
      return null;
    }

    final double latitude = exifInfo!.latitude!;
    final double longitude = exifInfo.longitude!;

    const zoomLevel = 16;

    if (Platform.isAndroid) {
      Uri uri = Uri(
        scheme: 'geo',
        host: '$latitude,$longitude',
        queryParameters: {
          'z': '$zoomLevel',
          'q': '$latitude,$longitude($formattedDateTime)',
        },
      );
      if (await canLaunchUrl(uri)) {
        return uri;
      }
    } else if (Platform.isIOS) {
      var params = {
        'll': '$latitude,$longitude',
        'q': formattedDateTime,
        'z': '$zoomLevel',
      };
      Uri uri = Uri.https('maps.apple.com', '/', params);
      if (await canLaunchUrl(uri)) {
        return uri;
      }
    }

    return Uri(
      scheme: 'https',
      host: 'openstreetmap.org',
      queryParameters: {'mlat': '$latitude', 'mlon': '$longitude'},
      fragment: 'map=$zoomLevel/$latitude/$longitude',
    );
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final assetWithExif = ref.watch(assetDetailProvider(asset));
    final exifInfo = (assetWithExif.value ?? asset).exifInfo;
    var textColor = context.isDarkTheme ? Colors.white : Colors.black;

    buildMap() {
      return Padding(
        padding: const EdgeInsets.symmetric(vertical: 16.0),
        child: LayoutBuilder(
          builder: (context, constraints) {
            return MapThumbnail(
              coords: LatLng(
                exifInfo?.latitude ?? 0,
                exifInfo?.longitude ?? 0,
              ),
              height: 150,
              zoom: 16.0,
              markers: [
                Marker(
                  anchorPos: AnchorPos.align(AnchorAlign.top),
                  point: LatLng(
                    exifInfo?.latitude ?? 0,
                    exifInfo?.longitude ?? 0,
                  ),
                  builder: (ctx) => const Image(
                    image: AssetImage('assets/location-pin.png'),
                  ),
                ),
              ],
              onTap: (tapPosition, latLong) async {
                Uri? uri = await _createCoordinatesUri(exifInfo);

                if (uri == null) {
                  return;
                }

                debugPrint('Opening Map Uri: $uri');
                launchUrl(uri);
              },
            );
          },
        ),
      );
    }

    buildSizeText(Asset a) {
      String resolution = a.width != null && a.height != null
          ? "${a.height} x ${a.width}  "
          : "";
      String fileSize = a.exifInfo?.fileSize != null
          ? formatBytes(a.exifInfo!.fileSize!)
          : "";
      String text = resolution + fileSize;
      return text.isNotEmpty ? text : null;
    }

    buildDragHeader() {
      return const Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(height: 12),
          Align(
            alignment: Alignment.center,
            child: CustomDraggingHandle(),
          ),
          SizedBox(height: 12),
        ],
      );
    }

    buildLocation() {
      // Guard no lat/lng
      if (!hasCoordinates(exifInfo)) {
        return Container();
      }

      return Column(
        children: [
          // Location
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                "exif_bottom_sheet_location",
                style: context.textTheme.labelMedium?.copyWith(
                  color: context.textTheme.labelMedium?.color?.withAlpha(200),
                  fontWeight: FontWeight.w600,
                ),
              ).tr(),
              buildMap(),
              RichText(
                text: TextSpan(
                  style: context.textTheme.labelLarge,
                  children: [
                    if (exifInfo != null && exifInfo.city != null)
                      TextSpan(
                        text: exifInfo.city,
                      ),
                    if (exifInfo != null &&
                        exifInfo.city != null &&
                        exifInfo.state != null)
                      const TextSpan(
                        text: ", ",
                      ),
                    if (exifInfo != null && exifInfo.state != null)
                      TextSpan(
                        text: "${exifInfo.state}",
                      ),
                  ],
                ),
              ),
              Text(
                "${exifInfo!.latitude!.toStringAsFixed(4)}, ${exifInfo.longitude!.toStringAsFixed(4)}",
                style: context.textTheme.labelMedium?.copyWith(
                  color: context.textTheme.labelMedium?.color?.withAlpha(150),
                ),
              ),
            ],
          ),
        ],
      );
    }

    buildDate() {
      return Text(
        formattedDateTime,
        style: const TextStyle(
          fontWeight: FontWeight.bold,
          fontSize: 14,
        ),
      );
    }

    buildImageProperties() {
      // Helper to create the ListTile and avoid repeating code
      createImagePropertiesListStyle(title, subtitle) => ListTile(
            contentPadding: const EdgeInsets.all(0),
            dense: true,
            leading: Icon(
              Icons.image,
              color: textColor.withAlpha(200),
            ),
            titleAlignment: ListTileTitleAlignment.center,
            title: Text(
              title,
              style: context.textTheme.labelLarge,
            ),
            subtitle: subtitle,
          );

      final imgSizeString = buildSizeText(asset);

      if (imgSizeString == null && asset.fileName.isNotEmpty) {
        // There is only filename
        return createImagePropertiesListStyle(
          asset.fileName,
          null,
        );
      } else if (imgSizeString != null && asset.fileName.isNotEmpty) {
        // There is both filename and size information
        return createImagePropertiesListStyle(
          asset.fileName,
          Text(imgSizeString, style: context.textTheme.bodySmall),
        );
      } else if (imgSizeString != null && asset.fileName.isEmpty) {
        // There is only size information
        return createImagePropertiesListStyle(
          imgSizeString,
          null,
        );
      }
    }

    buildDetail() {
      final imgProperties = buildImageProperties();

      // There are no details
      if (imgProperties == null &&
          (exifInfo == null || exifInfo.make == null)) {
        return Container();
      }

      return Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.only(bottom: 8.0),
            child: Text(
              "exif_bottom_sheet_details",
              style: context.textTheme.labelMedium?.copyWith(
                color: context.textTheme.labelMedium?.color?.withAlpha(200),
                fontWeight: FontWeight.w600,
              ),
            ).tr(),
          ),
          if (imgProperties != null) imgProperties,
          if (exifInfo?.make != null)
            ListTile(
              contentPadding: const EdgeInsets.all(0),
              dense: true,
              leading: Icon(
                Icons.camera,
                color: textColor.withAlpha(200),
              ),
              title: Text(
                "${exifInfo!.make} ${exifInfo.model}",
                style: context.textTheme.labelLarge,
              ),
              subtitle: exifInfo.f != null ||
                      exifInfo.exposureSeconds != null ||
                      exifInfo.mm != null ||
                      exifInfo.iso != null
                  ? Text(
                      "ƒ/${exifInfo.fNumber}   ${exifInfo.exposureTime}   ${exifInfo.focalLength} mm   ISO ${exifInfo.iso ?? ''} ",
                      style: context.textTheme.bodySmall,
                    )
                  : null,
            ),
        ],
      );
    }

    return GestureDetector(
      onTap: () {
        // FocusScope.of(context).unfocus();
      },
      child: SingleChildScrollView(
        child: Card(
          shape: const RoundedRectangleBorder(
            borderRadius: BorderRadius.only(
              topLeft: Radius.circular(15),
              topRight: Radius.circular(15),
            ),
          ),
          margin: const EdgeInsets.all(0),
          child: Container(
            margin: const EdgeInsets.symmetric(horizontal: 16.0),
            child: LayoutBuilder(
              builder: (context, constraints) {
                if (constraints.maxWidth > 600) {
                  // Two column
                  return Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 12.0),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.stretch,
                      children: [
                        buildDragHeader(),
                        buildDate(),
                        if (asset.isRemote) DescriptionInput(asset: asset),
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Flexible(
                              flex: hasCoordinates(exifInfo) ? 5 : 0,
                              child: Padding(
                                padding: const EdgeInsets.only(right: 8.0),
                                child: buildLocation(),
                              ),
                            ),
                            Flexible(
                              flex: 5,
                              child: Padding(
                                padding: const EdgeInsets.only(left: 8.0),
                                child: buildDetail(),
                              ),
                            ),
                          ],
                        ),
                        const SizedBox(height: 50),
                      ],
                    ),
                  );
                }

                // One column
                return Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                    buildDragHeader(),
                    buildDate(),
                    assetWithExif.when(
                      data: (data) => DescriptionInput(asset: data),
                      error: (error, stackTrace) => Icon(
                        Icons.image_not_supported_outlined,
                        color: context.primaryColor,
                      ),
                      loading: () => const SizedBox(
                        width: 75,
                        height: 75,
                        child: CircularProgressIndicator.adaptive(),
                      ),
                    ),
                    const SizedBox(height: 8.0),
                    buildLocation(),
                    SizedBox(height: hasCoordinates(exifInfo) ? 16.0 : 0.0),
                    buildDetail(),
                    const SizedBox(height: 50),
                  ],
                );
              },
            ),
          ),
        ),
      ),
    );
  }
}