import 'package:capstone_project/providers/settings.dart';
import 'package:capstone_project/widgets/navbar.dart';
import 'package:file_picker/file_picker.dart';
import 'package:go_router/go_router.dart';
import 'package:path_provider/path_provider.dart';
import 'package:shadcn_flutter/shadcn_flutter.dart';

class SettingsPage extends StatefulWidget {

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

  @override
  State<SettingsPage> createState() => _SettingsPageState();
}

class _SettingsPageState extends State<SettingsPage> {

  bool _isLoading = true;

  String apiKey = "";
  List<Feed> feeds = [];
  String appStorageLocation = "";

  @override
  void initState() {
    // TODO: implement initState
    super.initState();

    loadPage();
  }

  void loadPage() async {
    SettingsProvider settings = SettingsProvider.of(context);

    setState(() {
      _isLoading = true;
    });

    apiKey = settings.openAIApiKey;
    feeds = settings.feeds;
    appStorageLocation = settings.applicationStorageLocation;

    setState(() {
      _isLoading = false;
    });
  }

  @override
  Widget build(BuildContext context) {

    if (_isLoading) {
      return Scaffold(
        child: Center(
          child: CircularProgressIndicator(),
        ),
      );
    }

    return Scaffold(
      headers: [
        AppBar(
          title: Text("Settings"),
        )
      ],
      footers: [
        ProjNavBar(
          currentPage: "settings",
        )
      ],
      child: Center(
        child: SizedBox(
          width: 600,
          child: SingleChildScrollView(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
            
                Text(
                  "Open AI"
                ).h4,
            
                Gap(12),
            
                Text(
                  "API Key"
                ).small.normal,
            
                Gap(8),
            
                TextField(
                  placeholder: Text(
                    "Enter your OpenAI API key"
                  ),
                  initialValue: apiKey.substring(0, 8) + "xxxxxx (Redacted for security)" ,
                  onChanged: (value) {
                    SettingsProvider settings = SettingsProvider.of(context);
            
                    settings.setOpenAIApiKey(value);
                  },
                ),
            
                Gap(8),
            
                if (apiKey.isEmpty)
                  DestructiveBadge(
                    child: Text(
                      "API key is required to use AI features."
                    ),
                  ),
            
                Gap(16),
            
                Divider(),
            
                Gap(16),
            
                Row(
                  children: [
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                              "News Feeds"
                          ).h4,
            
                          Gap(4),
            
                          Text(
                              "Manage your RSS news feeds."
                          ).muted.small,
                        ],
                      ),
                    ),
            
                    Button.outline(
                      child: Text(
                        "Add Feed"
                      ),
                      onPressed: () {
                        showDialog(
                          context: context,
                          barrierDismissible: false,
                          builder: (context) => AddFeedDialog()
                        ).then((value) {
                          loadPage();
                        });
                      },
                    )
                  ],
                ),
            
                Gap(24),
            
                for (Feed feed in feeds) ...[
            
                  Row(
                    children: [
                      Expanded(
                        child: Text(
                          feed.title.isNotEmpty ? feed.title : feed.url,
                          style: TextStyle(
                              decoration: feed.enabled ? TextDecoration.none : TextDecoration.lineThrough
                          ),
                        ),
                      ),
            
                      Builder(
                        builder: (context2) {
                          return GhostButton(
                            density: ButtonDensity.dense,
                            child: Icon(
                              LucideIcons.ellipsis,
            
                            ),
                            onPressed: () {
            
            
            
                              showDropdown(
                                context: context2,
                                builder: (_) {
                                  return DropdownMenu(
                                    children: [
                                      MenuButton(
                                        child: Text(
                                          "Edit"
                                        ),
                                        trailing: Icon(
                                          LucideIcons.filePen
                                        ),
                                        onPressed: (_) {
                                          // Navigator.of(context).pop();
            
                                          showDialog(
                                              context: context,
                                              barrierDismissible: false,
                                              builder: (context) => AddFeedDialog(
                                                existingFeed: feed,
                                              )
                                          ).then((value) {
                                            loadPage();
                                          });
            
                                        },
                                      )
                                    ],
                                  );
                                }
                              );
                            },
                          );
                        }
                      ),
            
                      Gap(4),
            
                      Switch(
                        value: feed.enabled,
                        onChanged: (value) {
                          SettingsProvider settings = SettingsProvider.of(context);
            
                          settings.updateFeed(
                            feed.id,
                            enabled: value
                          );
            
                          loadPage();
                        },
                      ),
                    ],
                  ),
            
                  SelectableText(
                    feed.url,
                    style: TextStyle(
                      decoration: feed.enabled ? TextDecoration.none : TextDecoration.lineThrough
                    ),
                  ).muted.small,
            
                  Gap(12),
                ],
            
                Gap(12),
            
                Divider(),
            
                Gap(16),
            
                Text(
                    "Application Data"
                ).h4,
            
                Gap(12),
            
                Text(
                  "Application Storage Location"
                ).small.normal,
            
                Gap(8),
            
                Row(
                  children: [
                    Expanded(
                      child: TextField(
                        placeholder: Text(
                          "Select a diretory using Browse"
                        ),
                        initialValue: appStorageLocation,
                        enabled: false,
                      ),
                    ),
            
                    Gap(8),
            
                    Button.outline(
                      child: Text(
                        "Browse"
                      ),
                      onPressed: () {
            
                        FilePicker.platform.getDirectoryPath().then((selectedPath) {
                          if (selectedPath != null) {
                            SettingsProvider settings = SettingsProvider.of(context);
            
                            settings.setApplicationStorageLocation(selectedPath);
            
                            loadPage();
            
                          }
                        });
            
                      },
                    ),
            
                    Gap(8),
            
                    IconButton.destructive(
                      icon: Icon(
                        LucideIcons.refreshCcw
                      ),
                      onPressed: () async {
                        SettingsProvider settings = SettingsProvider.of(context);
            
                        settings.setApplicationStorageLocation((await getApplicationDocumentsDirectory()).path);
            
                        loadPage();
                      },
                    )
                  ],
                ),
            
              ],
            ).withMargin(
              all: 10
            ),
          ),
        ),
      ).withPadding(all: 24),
    );
  }
}

class AddFeedDialog extends StatelessWidget {

  Feed? existingFeed;

  AddFeedDialog({super.key, this.existingFeed});

  InputKey feedTitleKey = InputKey("feed_title");
  InputKey feedUrlKey = InputKey("feed_url");

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(
          existingFeed == null ? "Add Feed" : "Edit Feed"
      ),
      content: SizedBox(
        width: 400,
        child: Form(
          onSubmit: (context, values) {
            String title = values[feedTitleKey] ?? "";
            String url = values[feedUrlKey] ?? "";

            SettingsProvider settings = SettingsProvider.of(context);

            if (existingFeed != null) {
              settings.updateFeed(
                existingFeed!.id,
                title: title,
                url: url
              );
            } else {
              settings.addFeed(Feed(
                title: title,
                url: url,
                enabled: true
              ));
            }

            Navigator.of(context).pop();
          },
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [

              Text(
                "Add a custom RSS feed to your news sources."
              ).muted,

              Gap(16),

              FormField(
                key: feedTitleKey,
                label: Text(
                  "Title"
                ),
                validator: ConditionalValidator((value) {
                  if (value is String) {
                    return value.trim().isNotEmpty;
                  }
                  return false;
                }, message: "Title cannot be empty"),
                child: TextField(
                  initialValue: existingFeed?.title,
                ),
              ),

              Gap(12),

              FormField(
                key: feedUrlKey,
                label: Text(
                  "Resource URL"
                ),
                validator: ConditionalValidator((value) {
                  if (value is String) {
                    return value.trim().isNotEmpty;
                  }
                  return false;
                }, message: "URL cannot be empty"),
                child: TextField(
                  initialValue: existingFeed?.url,
                )
              ),

              Gap(24),

              Text(
                "Only use valid RSS feed URLs. Preferably only use sites you trust, and specifically business and financial news sources."
              ),

              Gap(24),

              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [

                  Button.outline(
                    child: Text(
                      "Cancel"
                    ),
                    onPressed: () {
                      Navigator.of(context).pop();
                    },
                  ),

                  Gap(8),

                  SubmitButton(
                    child: Text(
                      existingFeed != null ? "Update Feed" : "Add Feed"
                    ),
                  ),
                ],
              )
            ],
          ),
        ),
      ),
    );
  }

}