import 'dart:io';
import 'dart:math';
import 'dart:typed_data';

import 'package:file_picker/file_picker.dart';
import 'package:go_router/go_router.dart';
import 'package:image/image.dart' as img;
import 'package:quotegen_client/services/quote_api.dart';
import 'package:shadcn_flutter/shadcn_flutter.dart';

class HomePage extends StatefulWidget {

  static GoRoute route = GoRoute(
    path: "/",
    builder: (context, state) => HomePage(),
  );

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {

  Map<String, dynamic> formData = {
    "display_name": "",
    "handle": "",
    "content": "",
    "timestamp": 0,
    "avatar_image": null,
    "post_image": null,
  };
  
  

  Uint8List? postPreviewImage;

  @override
  Widget build(BuildContext context) {

    double topPadding = MediaQuery.of(context).padding.top;
    double bottomPadding = MediaQuery.of(context).padding.bottom;

    return Scaffold(
      child: Column(
        children: [

          Gap(max(topPadding, 14)),

          AspectRatio(
            aspectRatio: 1,
            child: OutlinedContainer(
              backgroundColor: Colors.black,
              child: postPreviewImage == null ? Center(
                child: CircularProgressIndicator(
                  color: Colors.white,
                  strokeWidth: 3,
                ),
              ) : Image.memory(
                postPreviewImage!,
                fit: BoxFit.cover,
              ),
            )
          ).withPadding(
            horizontal: 14
          ),

          Gap(14),

          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [

              Row(
                children: [
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          "Display Name"
                        ).xSmall.semiBold,

                        Gap(6),

                        TextField(
                          placeholder: Text(
                            "e.g. John Doe"
                          ),
                          onChanged: (value) {
                            setState(() {
                              formData["display_name"] = value;
                            });
                            onSubmit();
                          },
                        ),
                      ],
                    ),
                  ),

                  Gap(14),

                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          "Handle"
                        ).xSmall.semiBold,

                        Gap(6),

                        TextField(
                          placeholder: Text(
                            "e.g. @johndoe"
                          ),
                          onChanged: (value) {
                            setState(() {
                              formData["handle"] = value;
                            });
                            onSubmit();
                          },
                        ),
                      ],
                    ),
                  ),
                ],
              ),

              Gap(10),

              SizedBox(
                height: 96,
                child: Row(
                  children: [
                    Expanded(
                      child: Column(
                          children: [
                            SizedBox(
                              width: double.infinity,
                              child: OutlineButton(
                                child: Text("Select Avatar Image"),
                                onPressed: () async {
                                  FilePickerResult? result = await FilePicker.platform.pickFiles(
                                    type: FileType.image,
                                    allowMultiple: false,
                                  );

                                  if (result != null) {
                                    Uint8List? imageBytes;

                                    // on web, bytes is availble directly
                                    if (result.files.single.bytes != null) {
                                      imageBytes = result.files.single.bytes!;
                                    }
                                    // on mobile (iOS/Android), need to raed from path
                                    else if (result.files.single.path != null) {
                                      File file = File(result.files.single.path!);
                                      imageBytes = await file.readAsBytes();
                                    }

                                    if (imageBytes != null) {
                                      // compression disabled for testing
                                      // Uint8List? compressedBytes = await compressImage(imageBytes, maxWidth: 400);

                                      if (!mounted) return;
                                      setState(() {
                                        formData["avatar_image"] = imageBytes;
                                      });
                                      onSubmit();
                                    }
                                  }
                                },
                              ),
                            ),
                
                            Gap(6),

                            SizedBox(
                              width: double.infinity,
                              child: OutlineButton(
                                child: Text("Select Post Image"),
                                onPressed: () async {
                                  FilePickerResult? result = await FilePicker.platform.pickFiles(
                                    type: FileType.image,
                                    allowMultiple: false,
                                  );

                                  if (result != null) {
                                    Uint8List? imageBytes;

                                    // on web, bytes is availble directly
                                    if (result.files.single.bytes != null) {
                                      imageBytes = result.files.single.bytes!;
                                    }
                                    // on mobile (iOS/Android), need to raed from path
                                    else if (result.files.single.path != null) {
                                      File file = File(result.files.single.path!);
                                      imageBytes = await file.readAsBytes();
                                    }

                                    if (imageBytes != null) {
                                      if (!mounted) return;
                                      setState(() {
                                        formData["post_image"] = imageBytes;
                                      });
                                      onSubmit();
                                    }
                                  }
                                },
                              ),
                            ),
                          ]
                      ),
                    ),

                    Gap(10),
                    
                    AspectRatio(
                      aspectRatio: 1,
                      child: ClipRRect(
                        borderRadius: BorderRadius.circular(1000),
                        child: formData["avatar_image"] != null ? Image.memory(
                          formData["avatar_image"],
                          width: 50,
                          height: 50,
                          fit: BoxFit.cover,
                        ) : OutlinedContainer(
                          borderRadius: BorderRadius.circular(1000),
                          child: Center(
                              child: Text(
                                formData["display_name"].isNotEmpty ? formData["display_name"][0].toUpperCase() : "P",
                              )
                          ),
                        ),
                      )
                    ),
                  ],
                ),
              ),

              Gap(10),

              Text(
                "Content"
              ).xSmall.semiBold,

              Gap(6),

              TextArea(
                onChanged: (value) {
                  setState(() {
                    formData["content"] = value;
                  });
                  onSubmit();
                },
              ),

              Gap(10),

              Text(
                "Timestamp"
              ).xSmall.semiBold,

              Gap(6),

              SizedBox(
                width: double.infinity,
                child: DatePicker(
                  value: DateTime.now(),
                  onChanged: (DateTime? date) {
                    setState(() {
                      formData["timestamp"] = date!.millisecondsSinceEpoch;
                    });
                    onSubmit();
                  }
                )
              ),

            ],
          ).withPadding(
            horizontal: 14
          )

        ],
      ),
    );
  }

  // compress and resize image to reduce payload size
  Future<Uint8List?> compressImage(Uint8List bytes, {int maxWidth = 800, int quality = 85}) async {
    try {
      img.Image? image = img.decodeImage(bytes);
      if (image == null) return null;

      // resize if image is larger than maxWidth
      if (image.width > maxWidth) {
        image = img.copyResize(image, width: maxWidth);
      }

      // encode as JPEG with compression
      return Uint8List.fromList(img.encodeJpg(image, quality: quality));
    } catch (e) {
      print("Error compresing image: $e");
      return null;
    }
  }

  int _submitCount = 0;
  void onSubmit() async {

    int currentSubmit = ++_submitCount;

    await Future.delayed(Duration(milliseconds: 700));

    // Only proceed if this is the latest submit
    if (currentSubmit != _submitCount) return;

    if (!mounted) return;
    setState(() {
      postPreviewImage = null;
    });

    print("Form Data Submitted: $formData");

    if (!formData["handle"].startsWith("@")) {
      formData["handle"] = "@" + formData["handle"];
    }

    QuoteRequest request = QuoteRequest(
      displayName: formData["display_name"],
      username: formData["handle"].toLowerCase(),
      text: formData["content"],
      timestamp: formData["timestamp"],
      avatarUrl: formData["avatar_image"],
      imageUrl: formData["post_image"],
    );

    Uint8List imageBytes = await QuoteGeneratorApi.generateQuotePost(request);

    if (!mounted) return;
    setState(() {
      postPreviewImage = imageBytes;
    });

  }
}