import 'package:dio/dio.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:voyagehandbook/api/wikimedia.dart';
import 'package:voyagehandbook/util/drawer.dart';
import 'package:voyagehandbook/util/render.dart';
import 'package:voyagehandbook/util/storage.dart';
import 'package:voyagehandbook/util/styles.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';

/*
        Voyage Handbook - The open-source WikiVoyage reader
        Copyright (C) 2023 Matyáš Caras

        This program is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License version 3 as published by
        the Free Software Foundation.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

/// Renders a single WikiVoyage article
class ArticleView extends StatefulWidget {
  const ArticleView({super.key, required this.pageKey, required this.name});
  final String pageKey;
  final String name;

  @override
  State<ArticleView> createState() => _ArticleViewState();
}

class _ArticleViewState extends State<ArticleView> {
  var _content = <Widget>[];
  @override
  didChangeDependencies() {
    super.didChangeDependencies();

    loadPage();
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          actions: (kDebugMode)
              ? [
                  IconButton(
                      onPressed: () => loadPage(),
                      icon: const Icon(Icons.restart_alt))
                ]
              : null),
      drawer: genDrawer(0, context),
      body: Center(
        child: SizedBox(
          height: MediaQuery.of(context).size.height,
          width: MediaQuery.of(context).size.width * 0.9,
          child: SingleChildScrollView(
            physics: const AlwaysScrollableScrollPhysics(),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: _content,
            ),
          ),
        ),
      ),
    );
  }

  void loadPage() async {
    if (!mounted) return;
    var renderer = PageRenderer(
        Theme.of(context).colorScheme,
        MediaQuery.of(context).size.height,
        MediaQuery.of(context).size.width,
        context,
        AppLocalizations.of(context)!);

    try {
      _content = [
        SizedBox(
          width: MediaQuery.of(context).size.width * 0.9,
          height: MediaQuery.of(context).size.height,
          child: await renderer
              .renderFromPageHTML(await WikiApi.getRawPage(widget.pageKey)),
        )
      ];
    } catch (e) {
      if (e.toString().contains("Failed host lookup")) {
        // user is offline
        var offline = await StorageAccess.getOfflinePage(widget.pageKey);
        if (offline == null) {
          // Not downloaded, show error
          if (!mounted) return;
          _content = [
            Text(
              AppLocalizations.of(context)!.renderError,
              style: PageStyles.h1,
            ),
            const SizedBox(
              height: 10,
            ),
            Text(AppLocalizations.of(context)!.offlineError)
          ];
        } else {
          // Render offline version
          if (!mounted) return;
          _content = [
            SizedBox(
              width: MediaQuery.of(context).size.width * 0.9,
              height: MediaQuery.of(context).size.height,
              child: await renderer.renderFromPageHTML(offline),
            )
          ];
        }
      } else {
        _content = [
          Text(
            AppLocalizations.of(context)!.renderError,
            style: PageStyles.h1,
          ),
          const SizedBox(
            height: 10,
          ),
          Text(e.toString())
        ];
      }
    }

    setState(() {});
  }

  void addToRecents() {
    StorageAccess.addToRecents(widget.name, widget.pageKey);
    if (kDebugMode) {
      print("Added ${widget.name} to recent");
    }
  }
}