import 'package:dartz/dartz.dart' as dartz;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:shlink_app/API/Classes/ShortURL/short_url.dart';
import 'package:shlink_app/API/Classes/ShortURLSubmission/short_url_submission.dart';
import 'package:shlink_app/API/server_manager.dart';
import '../globals.dart' as globals;

class ShortURLEditView extends StatefulWidget {
  const ShortURLEditView({super.key, this.shortUrl, this.longUrl});

  final ShortURL? shortUrl;
  final String? longUrl;

  @override
  State<ShortURLEditView> createState() => _ShortURLEditViewState();
}

class _ShortURLEditViewState extends State<ShortURLEditView>
    with SingleTickerProviderStateMixin {
  final longUrlController = TextEditingController();
  final customSlugController = TextEditingController();
  final titleController = TextEditingController();
  final randomSlugLengthController = TextEditingController(text: "5");

  bool randomSlug = true;
  bool isCrawlable = true;
  bool forwardQuery = true;
  bool copyToClipboard = true;

  bool disableSlugEditor = false;

  String longUrlError = "";
  String randomSlugLengthError = "";

  bool isSaving = false;

  late AnimationController _customSlugDiceAnimationController;

  @override
  void initState() {
    _customSlugDiceAnimationController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 500),
    );
    loadExistingUrl();
    if (widget.longUrl != null) {
      longUrlController.text = widget.longUrl!;
    }
    super.initState();
  }

  @override
  void dispose() {
    longUrlController.dispose();
    customSlugController.dispose();
    titleController.dispose();
    randomSlugLengthController.dispose();
    super.dispose();
  }

  void loadExistingUrl() {
    if (widget.shortUrl != null) {
      longUrlController.text = widget.shortUrl!.longUrl;
      isCrawlable = widget.shortUrl!.crawlable;
      // for some reason this attribute is not returned by the api
      forwardQuery = true;
      titleController.text = widget.shortUrl!.title ?? "";
      customSlugController.text = widget.shortUrl!.shortCode;
      disableSlugEditor = true;
      randomSlug = false;
    }
  }

  void _submitShortUrl() async {
    var newSubmission = ShortURLSubmission(
        longUrl: longUrlController.text,
        tags: [],
        crawlable: isCrawlable,
        forwardQuery: forwardQuery,
        findIfExists: true,
        title: titleController.text != "" ? titleController.text : null,
        customSlug: customSlugController.text != "" && !randomSlug
            ? customSlugController.text
            : null,
        shortCodeLength:
            randomSlug ? int.parse(randomSlugLengthController.text) : null);
    dartz.Either<ShortURL, Failure> response;
    if (widget.shortUrl != null) {
      response = await globals.serverManager.updateShortUrl(newSubmission);
    } else {
      response = await globals.serverManager.submitShortUrl(newSubmission);
    }

    response.fold((l) async {
      setState(() {
        isSaving = false;
      });

      if (copyToClipboard) {
        await Clipboard.setData(ClipboardData(text: l.shortUrl));
        final snackBar = SnackBar(
            content: const Text("Copied to clipboard!"),
            backgroundColor: Colors.green[400],
            behavior: SnackBarBehavior.floating);
        ScaffoldMessenger.of(context).showSnackBar(snackBar);
      } else {
        final snackBar = SnackBar(
            content: const Text("Short URL created!"),
            backgroundColor: Colors.green[400],
            behavior: SnackBarBehavior.floating);
        ScaffoldMessenger.of(context).showSnackBar(snackBar);
      }
      Navigator.pop(context, l);

      return true;
    }, (r) {
      setState(() {
        isSaving = false;
      });

      var text = "";

      if (r is RequestFailure) {
        text = r.description;
      } else {
        text = (r as ApiFailure).detail;
        if ((r).invalidElements != null) {
          text = "$text: ${(r).invalidElements}";
        }
      }

      final snackBar = SnackBar(
          content: Text(text),
          backgroundColor: Colors.red[400],
          behavior: SnackBarBehavior.floating);
      ScaffoldMessenger.of(context).showSnackBar(snackBar);
      return false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomScrollView(
        slivers: [
          SliverAppBar.medium(
            title: Text("${disableSlugEditor ? "Edit" : "New"} Short URL",
                style: const TextStyle(fontWeight: FontWeight.bold)),
          ),
          SliverToBoxAdapter(
              child: Padding(
            padding: const EdgeInsets.only(left: 16, right: 16, top: 16),
            child: Column(
              children: [
                TextField(
                  controller: longUrlController,
                  decoration: InputDecoration(
                      errorText: longUrlError != "" ? longUrlError : null,
                      border: const OutlineInputBorder(),
                      label: const Row(
                        children: [
                          Icon(Icons.public),
                          SizedBox(width: 8),
                          Text("Long URL")
                        ],
                      )),
                ),
                const SizedBox(height: 16),
                Row(
                  children: [
                    Expanded(
                      child: TextField(
                        enabled: !disableSlugEditor,
                        controller: customSlugController,
                        style: TextStyle(
                            color: randomSlug
                                ? Colors.grey
                                : Theme.of(context).brightness ==
                                        Brightness.light
                                    ? Colors.black
                                    : Colors.white),
                        onChanged: (_) {
                          if (randomSlug) {
                            setState(() {
                              randomSlug = false;
                            });
                          }
                        },
                        decoration: InputDecoration(
                            border: const OutlineInputBorder(),
                            label: Row(
                              children: [
                                const Icon(Icons.link),
                                const SizedBox(width: 8),
                                Text(
                                  "${randomSlug ? "Random" : "Custom"} slug",
                                  style: TextStyle(
                                      fontStyle: randomSlug
                                          ? FontStyle.italic
                                          : FontStyle.normal),
                                )
                              ],
                            )),
                      ),
                    ),
                    const SizedBox(width: 8),
                    RotationTransition(
                      turns: Tween(begin: 0.0, end: 3.0).animate(
                          CurvedAnimation(
                              parent: _customSlugDiceAnimationController,
                              curve: Curves.easeInOutExpo)),
                      child: IconButton(
                          onPressed: disableSlugEditor
                              ? null
                              : () {
                                  if (randomSlug) {
                                    _customSlugDiceAnimationController.reverse(
                                        from: 1);
                                  } else {
                                    _customSlugDiceAnimationController.forward(
                                        from: 0);
                                  }
                                  setState(() {
                                    randomSlug = !randomSlug;
                                  });
                                },
                          icon: Icon(
                              randomSlug ? Icons.casino : Icons.casino_outlined,
                              color: randomSlug ? Colors.green : Colors.grey)),
                    )
                  ],
                ),
                if (randomSlug) const SizedBox(height: 16),
                if (randomSlug)
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      const Text("Random slug length"),
                      SizedBox(
                          width: 100,
                          child: TextField(
                            controller: randomSlugLengthController,
                            keyboardType: TextInputType.number,
                            decoration: InputDecoration(
                                errorText:
                                    randomSlugLengthError != "" ? "" : null,
                                border: const OutlineInputBorder(),
                                label: const Row(
                                  children: [
                                    Icon(Icons.tag),
                                    SizedBox(width: 8),
                                    Text("Length")
                                  ],
                                )),
                          ))
                    ],
                  ),
                const SizedBox(height: 16),
                TextField(
                  controller: titleController,
                  decoration: const InputDecoration(
                      border: OutlineInputBorder(),
                      label: Row(
                        children: [
                          Icon(Icons.badge),
                          SizedBox(width: 8),
                          Text("Title")
                        ],
                      )),
                ),
                const SizedBox(height: 16),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text("Crawlable"),
                    Switch(
                      value: isCrawlable,
                      onChanged: (_) {
                        setState(() {
                          isCrawlable = !isCrawlable;
                        });
                      },
                    )
                  ],
                ),
                const SizedBox(height: 16),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text("Forward query params"),
                    Switch(
                      value: forwardQuery,
                      onChanged: (_) {
                        setState(() {
                          forwardQuery = !forwardQuery;
                        });
                      },
                    )
                  ],
                ),
                const SizedBox(height: 16),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text("Copy to clipboard"),
                    Switch(
                      value: copyToClipboard,
                      onChanged: (_) {
                        setState(() {
                          copyToClipboard = !copyToClipboard;
                        });
                      },
                    )
                  ],
                ),
              ],
            ),
          ))
        ],
      ),
      floatingActionButton: FloatingActionButton(
          onPressed: () {
            if (!isSaving) {
              setState(() {
                isSaving = true;
                longUrlError = "";
                randomSlugLengthError = "";
              });
              if (longUrlController.text == "") {
                setState(() {
                  longUrlError = "URL cannot be empty";
                  isSaving = false;
                });
                return;
              } else if (int.tryParse(randomSlugLengthController.text) ==
                      null ||
                  int.tryParse(randomSlugLengthController.text)! < 1 ||
                  int.tryParse(randomSlugLengthController.text)! > 50) {
                setState(() {
                  randomSlugLengthError = "invalid number";
                  isSaving = false;
                });
                return;
              } else {
                _submitShortUrl();
              }
            }
          },
          child: isSaving
              ? const Padding(
                  padding: EdgeInsets.all(16),
                  child: CircularProgressIndicator(strokeWidth: 3))
              : const Icon(Icons.save)),
    );
  }
}