import 'dart:ui' as ui;

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:share_plus/share_plus.dart';
import 'package:onsolgo/core/constants.dart';

/// Captures a [RepaintBoundary] (via [key]) as PNG and shares it with [text] and a [link]
/// (defaults to [kOnsolAppWebUrl]). Uses in-memory bytes only (no [dart:io]).
class OnsolShare {
  static Future<void> share(GlobalKey key, String text, {String? link}) =>
      _shareImpl(key, text, link: link);
}

Future<void> _shareImpl(GlobalKey key, String text, {String? link}) async {
  final url = (link ?? kOnsolAppWebUrl).trim();
  String bodyWithLink(String raw) {
    final caption = raw.trim().isEmpty ? 'ONSOL-GO!' : raw.trim();
    if (caption.contains(url)) return caption;
    return '$caption\n\n$url';
  }

  final fallbackMessage = bodyWithLink(text);

  Future<void> shareText(String value) async {
    await SharePlus.instance.share(ShareParams(text: value));
  }

  Future<void> clipboard(String value) async {
    await Clipboard.setData(ClipboardData(text: value));
  }

  try {
    final ctx = key.currentContext;
    if (ctx == null || !ctx.mounted) {
      await shareText(fallbackMessage);
      return;
    }

    await SchedulerBinding.instance.endOfFrame;

    if (!ctx.mounted) {
      await shareText(fallbackMessage);
      return;
    }

    final boundary = ctx.findRenderObject();
    if (boundary is! RenderRepaintBoundary) {
      await shareText(fallbackMessage);
      return;
    }

    final image = await boundary.toImage(pixelRatio: 3.0);
    final byteData = await image.toByteData(format: ui.ImageByteFormat.png);
    if (byteData == null) {
      await shareText(fallbackMessage);
      return;
    }

    final pngBytes = byteData.buffer.asUint8List();
    final file = XFile.fromData(
      pngBytes,
      mimeType: 'image/png',
      name: 'onsol_share.png',
    );

    try {
      await SharePlus.instance.share(
        ShareParams(files: [file], text: bodyWithLink(text)),
      );
    } catch (e) {
      if (kDebugMode) {
        debugPrint('OnsolShare: file+caption share failed ($e), retrying file only');
      }
      try {
        await SharePlus.instance.share(
          ShareParams(files: [file], text: bodyWithLink(text)),
        );
      } catch (e2) {
        if (kDebugMode) {
          debugPrint('OnsolShare: file-only share failed ($e2), falling back to text');
        }
        await shareText(fallbackMessage);
      }
    }
  } catch (e, st) {
    if (kDebugMode) {
      debugPrint('OnsolShare error: $e\n$st');
    }
    try {
      await shareText(fallbackMessage);
    } catch (e3) {
      if (kDebugMode) {
        debugPrint('OnsolShare text share failed: $e3');
      }
      try {
        await clipboard(fallbackMessage);
      } catch (_) {}
    }
  }
}