import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:image_cropper/image_cropper.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:io' as io;
import 'dart:typed_data';

import '../constants.dart';
import '../models/user_profile.dart';

class EditProfilePage extends StatefulWidget {
  final UserProfile userData;

  const EditProfilePage({super.key, required this.userData});

  @override
  EditProfilePageState createState() => EditProfilePageState();
}

class EditProfilePageState extends State<EditProfilePage> {
  final _formKey = GlobalKey<FormState>();
  late TextEditingController _nameController;
  late TextEditingController _bioController;
  String? profileImageUrl;
  io.File? _profileImage; // for android/ios
  Uint8List? _webProfileImage; // for web

  @override
  void initState() {
    super.initState();
    _nameController = TextEditingController(text: widget.userData.name);
    _bioController = TextEditingController(text: widget.userData.bio);
    if (widget.userData.profilePictureUrl != null) {
      profileImageUrl = widget.userData.profilePictureUrl;
    }
  }

  Future<void> _pickImage() async {
    final pickedFile =
        await ImagePicker().pickImage(source: ImageSource.gallery);

    if (pickedFile != null) {
      CroppedFile? croppedFile = await ImageCropper().cropImage(
        sourcePath: pickedFile.path,
        //compressFormat: ImageCompressFormat.jpg,
        //compressQuality: 100,
        aspectRatioPresets: [
          CropAspectRatioPreset.square,
          CropAspectRatioPreset.ratio3x2,
          CropAspectRatioPreset.original,
          CropAspectRatioPreset.ratio4x3,
          CropAspectRatioPreset.ratio16x9,
        ],
        uiSettings: [
          AndroidUiSettings(
            toolbarTitle: 'Cropper',
            toolbarColor: Colors.deepOrange,
            toolbarWidgetColor: Colors.white,
            initAspectRatio: CropAspectRatioPreset.original,
            lockAspectRatio: false,
          ),
          IOSUiSettings(
            title: 'Cropper',
            minimumAspectRatio: 1.0,
          ),
          if (kIsWeb)
            WebUiSettings(
              context: context,
              presentStyle: CropperPresentStyle.page,
              boundary: const CroppieBoundary(
                width: 400,
                height: 400,
              ),
              viewPort: const CroppieViewPort(
                  width: 360, height: 360, type: 'circle'),
              enableExif: true,
              enableZoom: true,
              showZoomer: true,
            ),
        ],
      );

      if (croppedFile != null) {
        if (kIsWeb) {
          // web specific
          Uint8List webProfileImage = await croppedFile.readAsBytes();
          setState(() {
            _webProfileImage = webProfileImage;
          });
        } else {
          setState(() {
            _profileImage = io.File(croppedFile.path); // convert cropped file
          });
        }
      }
    }
  }

  void _clearProfileImage() {
    setState(() {
      _profileImage = null;
      _webProfileImage = null; // web only
      profileImageUrl = null;
      widget.userData.profilePictureUrl = null;
    });
  }

  Future<void> _saveProfile() async {
    String nameTrim = _nameController.text.trim();
    String bioTrim = _bioController.text.trim();

    if (_formKey.currentState!.validate()) {
      String uid = FirebaseAuth.instance.currentUser!.uid;

      if (_profileImage != null || _webProfileImage != null) {
        final storageRef = FirebaseStorage.instance
            .ref()
            .child(Constants.dbStoragePathProfiles)
            .child(uid); // filename = userid

        if (kIsWeb && _webProfileImage != null) {
          await storageRef.putData(_webProfileImage!);
          profileImageUrl = await storageRef.getDownloadURL();
        } else if (_profileImage != null) {
          await storageRef.putFile(_profileImage!);
          profileImageUrl = await storageRef.getDownloadURL();
        }
      }

      Map<String, dynamic> resultValues = {
        Constants.dbFieldUsersName: nameTrim,
        Constants.dbFieldUsersBio: bioTrim,
        Constants.dbFieldUsersProfilePic: profileImageUrl,
      };

      await FirebaseFirestore.instance
          .collection(Constants.dbCollectionUsers)
          .doc(uid)
          .update(resultValues);

      _close(resultValues);
    }
  }

  /// close this page and return selected values
  void _close(Map<String, dynamic> map) {
    Navigator.pop(context, {
      Constants.dbFieldUsersProfilePic: map[Constants.dbFieldUsersProfilePic],
      Constants.dbFieldUsersName: map[Constants.dbFieldUsersName],
      Constants.dbFieldUsersBio: map[Constants.dbFieldUsersBio],
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Edit Profile'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          child: ListView(
            children: [
              Center(
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.end,
                  children: [
                    buildAvatar(context),
                    if (_profileImage != null ||
                        _webProfileImage != null ||
                        widget.userData.profilePictureUrl != null)
                      IconButton(
                        icon: Ink(
                          decoration: const ShapeDecoration(
                            shape: CircleBorder(),
                          ),
                          child: const Icon(
                            Icons.delete,
                            color: Colors.red,
                            size: 32,
                          ),
                        ),
                        onPressed: _clearProfileImage,
                      ),
                  ],
                ),
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _nameController,
                decoration: const InputDecoration(labelText: 'Name'),
                validator: (value) {
                  if (value == null || value.trim().isEmpty) {
                    return 'Please enter a name';
                  }
                  return null;
                },
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _bioController,
                decoration: const InputDecoration(labelText: 'Bio'),
                maxLines: 3,
                maxLength: 4096,
              ),
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: _saveProfile,
                child: const Text('Save'),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget buildAvatar(BuildContext context) {
    return GestureDetector(
      onTap: _pickImage,
      child: Stack(
        children: [
          CircleAvatar(
            radius: 50,
            backgroundImage: _profileImage != null
                ? FileImage(_profileImage!)
                : (_webProfileImage != null
                    ? MemoryImage(_webProfileImage!)
                    : (widget.userData.profilePictureUrl != null &&
                            widget.userData.profilePictureUrl!.isNotEmpty
                        ? NetworkImage(widget.userData.profilePictureUrl!)
                        : null as ImageProvider<Object>?)),
            child: ClipOval(
              child: _profileImage == null &&
                      _webProfileImage == null &&
                      widget.userData.profilePictureUrl == null
                  ? const Icon(Icons.person, size: 50)
                  : null,
            ),
          ),
          Positioned(
            bottom: 0,
            right: 0,
            child: IconButton(
              icon: Ink(
                decoration: ShapeDecoration(
                  color: Theme.of(context).colorScheme.primary,
                  shape: const CircleBorder(),
                ),
                child: const Icon(Icons.edit),
              ),
              onPressed: _pickImage,
            ),
          ),
        ],
      ),
    );
  }
}