import "dart:typed_data";

import "package:auto_route/auto_route.dart";
import "package:flutter/material.dart";
import "package:flutter_riverpod/flutter_riverpod.dart";

import "package:smol_mail/data/providers/providers.dart";
import "package:smol_mail/presentation/widgets/image_banner.dart";
import "package:smol_mail/presentation/widgets/message/message_view.dart";
import "package:smol_mail/presentation/theme/app_colors.dart";
import "package:smol_mail/shared/utils/snackbar.dart";
import "package:smol_mail/smol/errors.dart";

/// Fetched mail is acknowledged off the server during fetch, so deleting here
/// removes only the local sealed copy.
@RoutePage()
class MessageDetailScreen extends ConsumerWidget {
  final String folder;
  final String id;

  const MessageDetailScreen({
    super.key,
    required this.folder,
    required this.id,
  });

  Future<void> _delete(BuildContext context, WidgetRef ref) async {
    await ref.read(storeProvider).deleteMessage(folder, id);
    ref.read(revisionProvider.notifier).bump();
    if (context.mounted) {
      AutoRouter.of(context).pop();
    }
  }

  Future<void> _nameSender(BuildContext context, WidgetRef ref,
      Uint8List senderKey) async {
    final client = ref.read(clientProvider);
    final controller = TextEditingController();
    final address = await showDialog<String>(
      context: context,
      builder: (ctx) => AlertDialog(
        backgroundColor: Theme.of(context).extension<AppColors>()!.cardFill,
        content: TextField(
          controller: controller,
          decoration: InputDecoration(
            hintText: "user@host or smol://…",
            filled: true,
            fillColor: Theme.of(context).colorScheme.surface,
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(ctx).pop(controller.text),
            child: const Text("Save"),
          ),
        ],
      ),
    );
    if (address == null || address.trim().isEmpty) return;
    try {
      await client.nameSender(address, senderKey);
      ref.read(revisionProvider.notifier).bump();
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text("Address saved for this sender")),
        );
      }
    } on SmolError catch (err) {
      if (context.mounted) {
        showErrorSnackBar(context, err.message);
      }
    }
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final record = ref.watch(storeProvider).getMessage(folder, id);
    if (record == null) {
      return Scaffold(
        appBar: AppBar(),
        body: const ImageBanner(
          imgSrc: "assets/images/error.png",
          text: "Message not found!",
        ),
      );
    }
    final client = ref.read(clientProvider);
    final opened = client.describe(record);
    final isSent = folder == "sent";
    final who = isSent
        ? (record.recipient ?? "")
        : (opened.sender == null
            ? ""
            : ref.watch(storeProvider).addressForKey(opened.sender!) ?? "");

    return Scaffold(
      appBar: AppBar(
        title: who.isEmpty
            ? null
            : Text(
                who,
                overflow: TextOverflow.ellipsis,
                style: TextStyle(
                  fontFamily: "Inter",
                  fontWeight: FontWeight.w500,
                  fontSize: 18,
                  color: Theme.of(context).colorScheme.onSurface,
                ),
              ),
        actions: [
          IconButton(
            tooltip: "Delete local copy",
            onPressed: () => _delete(context, ref),
            icon: const Icon(Icons.delete),
          ),
        ],
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
        child: MessageView(
          record: record,
          opened: opened,
          onNameSender: opened.sender == null
              ? null
              : (key) => _nameSender(context, ref, key),
        ),
      ),
    );
  }
}