import 'dart:io';

import 'package:dartboard_resume/annotation_manager.dart';
import 'package:dartboard_resume/models/dartboard_data.dart';
import 'package:dartboard_resume/models/dartboard_misc.dart';
import 'package:dartboard_resume/models/experience.dart';
import 'package:dartboard_resume/models/theme.dart';
import 'package:dartboard_resume/widgets/dartboard_misc_entry.dart';
import 'package:dartboard_resume/widgets/experience_entry.dart';
import 'package:dartboard_resume/widgets/footer.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart';
import 'package:toml/toml.dart';

int? lastDartboardHash;

Future<void> renderPdf(String tomlFilePath, {bool force = false}) async {
  try {
    final start = DateTime.now().microsecondsSinceEpoch;
    final dartboardData = DartboardData.fromToml(tomlFilePath);
    if (lastDartboardHash == dartboardData.hashCode && !force) {
      return;
    }
    lastDartboardHash = dartboardData.hashCode;
    stdout.writeln("Detected change:\nRendering with new dartboard data: $lastDartboardHash");
    final pdfFuture = Document()..addPage(_generatePdfPage(dartboardData: dartboardData, renderNs: 0));
    await pdfFuture.save();

    final renderNs = DateTime.now().microsecondsSinceEpoch - start;

    final pdf = Document();
    pdf.addPage(_generatePdfPage(dartboardData: dartboardData, renderNs: renderNs));
    final file = File("example.pdf");
    final bytes = await pdf.save();

    stdout.writeln('New pdf file saved.');
    file.writeAsBytesSync(bytes);
    AnnotationManager().reset();
  } catch (e, st) {
    stderr.writeln('Encountered error: $e');
    stderr.writeln(st);
    try {
      stderr.writeln('Current toml map:\n${TomlDocument.loadSync(tomlFilePath).toMap()}');
    } catch (_) {
      stderr.writeln('Cannot display current toml map');
    }
  }
}

Page _generatePdfPage({required DartboardData dartboardData, required int renderNs}) {
  AnnotationManager().style = dartboardData.defaultTextStyle;
  final List<Widget> groupedExperienceList = dartboardData.groupedExperiences.entries.map<Widget>(
    (entry) {
      final String subsection = entry.key;
      final List<Experience> experiences = entry.value;
      return Column(
        children: [
          Row(
            children: [
              Text(
                subsection,
                style: dartboardData.subheaderTextStyle
                    .merge(const TextStyle(fontSize: 18))
                    .apply(color: const PdfColorGrey(0.2)),
              ),
            ],
          ),
          Row(
            children: [
              Container(height: 2, width: 200, color: const PdfColorGrey(0.7)),
            ],
          ),
          SizedBox(height: 3),
          ...experiences.map(
            (Experience exp) => ExperienceEntry(dartboardData: dartboardData, exp: exp),
          ),
        ],
      );
    },
  ).toList();
  final List<Widget> groupedMiscList = dartboardData.groupedMisc.entries.map<Widget>((entry) {
    final String subsection = entry.key;
    final List<DartboardMisc> miscs = entry.value;
    return Column(
      children: [
        Row(
          children: [
            Text(
              subsection,
              style: dartboardData.subheaderTextStyle
                  .merge(const TextStyle(fontSize: 18))
                  .apply(color: const PdfColorGrey(0.2)),
            ),
          ],
        ),
        Row(
          children: [
            Container(height: 2, width: 200, color: const PdfColorGrey(0.7)),
          ],
        ),
        SizedBox(height: 3),
        ...miscs.map(
          (DartboardMisc misc) => DartboardMiscEntry(dartboardData: dartboardData, misc: misc),
        ),
      ],
    );
  }).toList();
  return Page(
    pageTheme: PageTheme(
      buildBackground: (_) => Container(color: dartboardData.backgroundColor),
      pageFormat: PdfPageFormat.standard,
      margin: EdgeInsets.zero,
    ),
    build: (Context context) {
      return FullPage(
        ignoreMargins: true,
        child: Padding(
          padding: const EdgeInsets.all(DocumentTheme.cm * 2),
          child: Column(
            children: [
              if (dartboardData.imagePath == null)
                Center(
                  child: Column(
                    children: [
                      Text(dartboardData.fullName, style: dartboardData.headerTextStyle),
                      if (dartboardData.phoneNumber != null)
                        Text(dartboardData.phoneNumber!, style: dartboardData.headerTextStyle),
                      if (dartboardData.email != null) Text(dartboardData.email!, style: dartboardData.headerTextStyle),
                    ],
                  ),
                )
              else
                SizedBox(
                  height: 100,
                  width: double.infinity,
                  child: Stack(
                    children: [
                      if (dartboardData.imagePath != null)
                        Positioned(
                          left: 0,
                          child: Container(
                            height: 100,
                            width: 100,
                            decoration: BoxDecoration(
                              shape: BoxShape.circle,
                              image: DecorationImage(
                                fit: BoxFit.contain,
                                image: MemoryImage(
                                  File(dartboardData.imagePath!).readAsBytesSync(),
                                ),
                              ),
                            ),
                          ),
                        ),
                      Center(
                        child: Column(
                          children: [
                            Text(dartboardData.fullName, style: dartboardData.headerTextStyle),
                            if (dartboardData.phoneNumber != null)
                              Text(dartboardData.phoneNumber!, style: dartboardData.headerTextStyle),
                            if (dartboardData.email != null)
                              Text(dartboardData.email!, style: dartboardData.headerTextStyle),
                          ],
                        ),
                      ),
                    ],
                  ),
                ),
              ...groupedExperienceList,
              ...groupedMiscList,
              // this is quirky and gets evaluated before the actual footnotes get added up, so the original adding is done in the prerender
              ...AnnotationManager().footnotes,
              DartboardFooter(dartboardData: dartboardData, renderNs: renderNs),
            ],
            // ),
          ),
        ),
      );
    },
  );
}