import 'package:flutter/material.dart';
import 'package:pdfrx/pdfrx.dart';
import 'package:sheetless/api.dart';
import 'package:sheetless/sheet.dart';

class SheetViewerPage extends StatefulWidget {
  final Sheet sheet;
  final ApiClient apiClient;

  const SheetViewerPage(
      {super.key, required this.sheet, required this.apiClient});

  @override
  State<SheetViewerPage> createState() => _SheetViewerPageState();
}

class _SheetViewerPageState extends State<SheetViewerPage> {
  int page = 1;
  int numPages = 1;

  @override
  void initState() {
    super.initState();
  }

  Future<PdfDocument> loadPdf() async {
    var file = await widget.apiClient.getPdfFileCached(widget.sheet.uuid);
    if (file == null) {
      throw Exception("Failed fetching pdf file");
    }

    var document = await PdfDocument.openFile(file.path);

    return document;
  }

  @override
  Widget build(BuildContext context) {
    print("Building with page: $page");
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.sheet.name),
      ),
      body: FutureBuilder(
          future: loadPdf(),
          builder: (BuildContext context, AsyncSnapshot<PdfDocument> snapshot) {
            if (snapshot.hasData) {
              var document = snapshot.data;
              if (document != null) {
                numPages = document.pages.length;
              }
              return GestureDetector(
                onTapUp: (TapUpDetails details) {
                  // Get the size of the screen
                  final screenWidth = MediaQuery.of(context).size.width;

                  // Check where the user tapped
                  if (details.localPosition.dx < screenWidth / 2) {
                    // Left half of the screen
                    setState(() {
                      page = page > 1 ? page - 1 : 1;
                    });
                  } else {
                    // Right half of the screen
                    setState(() {
                      page = page < numPages ? page + 1 : numPages;
                    });
                  }
                },
                child: Stack(
                  children: [
                    PdfPageView(
                      key: ValueKey(page),
                      document: document,
                      pageNumber: page,
                      alignment: Alignment.center,
                    ),
                    Container(
                      child: Text('$page / $numPages'),
                      alignment: Alignment.bottomCenter,
                      padding: EdgeInsets.only(bottom: 5),
                    ),
                  ],
                ),
              );
            } else if (snapshot.hasError) {
              return Center(
                  child: Text(
                      style: Theme.of(context)
                          .textTheme
                          .displaySmall!
                          .copyWith(color: Colors.red),
                      textAlign: TextAlign.center,
                      snapshot.error.toString()));
            } else {
              return const Center(child: CircularProgressIndicator());
            }
          }),
    );
  }
}