import 'dart:convert';
import 'dart:io';

import 'package:capstone_project/providers/settings.dart';
import 'package:capstone_project/utils/agrigator.dart';
import 'package:capstone_project/widgets/navbar.dart';
import 'package:go_router/go_router.dart';
import 'package:shadcn_flutter/shadcn_flutter.dart';

class HomePage extends StatelessWidget {

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

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      headers: [
        AppBar()
      ],
      footers: [
        ProjNavBar(
          currentPage: "home",
        )
      ],
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [

            Text(
              "Nothing here is final yet!",
            ).h1,

            Gap(16),

            Button.primary(
              onPressed: () async {
                print("Aggregating feeds...");
                SettingsProvider settings = SettingsProvider.of(context);

                // Fetch all feeds
                List<Uri> feedUris = settings.feeds.map((feed) => Uri.parse(feed.url)).toList();
                List<FeedItem> aggregatedItems = await fetchFeeds(feedUris);

                // Save it to a file before generating embeddings
                String agregatedJson = JsonEncoder.withIndent('  ').convert(aggregatedItems);
                File agregatedJsonFile = File("${settings.applicationStorageLocation}/aggregated_feed.json");
                await agregatedJsonFile.writeAsString(agregatedJson);
                print("Aggregated feed saved to ${agregatedJsonFile.path}");

                // Generate embeddings for all items
                print("Generating embeddings for ${aggregatedItems.length} items...");
                List<FeedItem> enrichedItems = [...aggregatedItems];
                await generateEmbeddings(enrichedItems, settings.openAIApiKey);

                // Save it to a file in the application storage location
                String enrichedJson = JsonEncoder.withIndent('  ').convert(enrichedItems);
                final file = File("${settings.applicationStorageLocation}/enriched_aggregated_feed.json");
                await file.writeAsString(enrichedJson);
                print("Enriched aggregated feed saved to ${file.path}");

                // Filter out irrelevant items
                print("Filtering relevant items...");
                await generateKeywordEmbeddings(settings.openAIApiKey);
                List<FeedItem> relevantItems = [...aggregatedItems]..removeWhere((item) => !isFeedItemRelevant(item));
                String relevantJson = JsonEncoder.withIndent('  ').convert(relevantItems);
                final fileRelevant = File("${settings.applicationStorageLocation}/relevant_aggregated_feed.json");
                await fileRelevant.writeAsString(relevantJson);
                print("Cut down from ${aggregatedItems.length} to ${relevantItems.length} relevant items.");
                print("Relevant aggregated feed saved to ${fileRelevant.path}");

                // For human readability, save a version without embeddings
                List<FeedItem> readableItems = relevantItems.map((item) {
                  return FeedItem(
                    title: item.title,
                    link: item.link,
                    description: item.description,
                  );
                }).toList();

                String readableJson = JsonEncoder.withIndent('  ').convert(readableItems);
                final fileReadable = File("${settings.applicationStorageLocation}/readable_relevant_aggregated_feed.json");
                await fileReadable.writeAsString(readableJson);
                print("Readable relevant aggregated feed saved to ${fileReadable.path}");

                // Group by event
                print("Grouping feed items by event...");
                List<List<FeedItem>> groupedItems = groupFeedItemsByEvent(relevantItems);
                List<List<Map<String, dynamic>>> groupedItemsJson = groupedItems.map((group) {
                  return group.map((item) => item.toJson()).toList();
                }).toList();
                String groupedJson = JsonEncoder.withIndent('  ').convert(groupedItemsJson);
                final fileGrouped = File("${settings.applicationStorageLocation}/grouped_relevant_aggregated_feed.json");
                await fileGrouped.writeAsString(groupedJson);
                print("Grouped relevant aggregated feed saved to ${fileGrouped.path}");

                // For human readability, save a version without embeddings
                List<List<FeedItem>> readableGroupedItems = groupedItems.map((group) {
                  return group.map((item) {
                    return FeedItem(
                      title: item.title,
                      link: item.link,
                      description: item.description,
                    );
                  }).toList();
                }).toList();
                // Sort groups by size descending
                readableGroupedItems.sort((a, b) => b.length.compareTo(a.length));
                List<List<Map<String, dynamic>>> readableGroupedItemsJson = readableGroupedItems.map((group) {
                  return group.map((item) => item.toJson()).toList();
                }).toList();
                String readableGroupedJson = JsonEncoder.withIndent('  ').convert(readableGroupedItemsJson);
                final fileReadableGrouped = File("${settings.applicationStorageLocation}/readable_grouped_relevant_aggregated_feed.json");
                await fileReadableGrouped.writeAsString(readableGroupedJson);
                print("Readable grouped relevant aggregated feed saved to ${fileReadableGrouped.path}");

              },
              child: Text(
                "Aggregate your feeds"
              ),
            )



          ],
        ),
      ),
    );
  }

}