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/primary_button.dart";
import "package:smol_mail/presentation/widgets/small_loading_spinner.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";

/// One tap seals one envelope; the button disables while the send is in
/// flight so a second tap cannot seal a second message.
@RoutePage()
class ComposeScreen extends ConsumerStatefulWidget {
  final String? to;
  final String? subject;

  const ComposeScreen({
    super.key,
    this.to,
    this.subject,
  });

  @override
  ConsumerState<ComposeScreen> createState() => _ComposeScreenState();
}

class _ComposeScreenState extends ConsumerState<ComposeScreen> {
  late final toController = TextEditingController(text: widget.to ?? "");
  late final subjectController =
      TextEditingController(text: widget.subject ?? "");
  final bodyController = TextEditingController();
  bool anonymous = false;
  bool busy = false;

  @override
  void dispose() {
    toController.dispose();
    subjectController.dispose();
    bodyController.dispose();
    super.dispose();
  }

  Future<void> _send() async {
    final client = ref.read(clientProvider);
    setState(() => busy = true);
    try {
      final to = await client.send(
        toController.text,
        subjectController.text,
        bodyController.text,
        anonymous: anonymous,
      );
      ref.read(revisionProvider.notifier).bump();
      if (mounted) {
        ScaffoldMessenger.of(context)
            .showSnackBar(SnackBar(content: Text("sent to $to")));
        AutoRouter.of(context).pop();
      }
    } on SmolError catch (err) {
      if (mounted) {
        showErrorSnackBar(context, err.message);
      }
    } finally {
      if (mounted) setState(() => busy = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Write")),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            TextField(
              controller: toController,
              decoration: InputDecoration(
                labelText: "To",
                hintText: "user@host[:1961] or smol://user@host/key",
                filled: true,
                fillColor: Theme.of(context).extension<AppColors>()!.cardFill,
              ),
            ),
            const SizedBox(height: 15),
            TextField(
              controller: subjectController,
              decoration: InputDecoration(
                labelText: "Subject",
                filled: true,
                fillColor: Theme.of(context).extension<AppColors>()!.cardFill,
              ),
            ),
            const SizedBox(height: 15),
            TextField(
              controller: bodyController,
              maxLines: 12,
              decoration: InputDecoration(
                labelText: "Body",
                filled: true,
                fillColor: Theme.of(context).extension<AppColors>()!.cardFill,
              ),
            ),
            SwitchListTile(
              value: anonymous,
              onChanged: (value) => setState(() => anonymous = value),
              title: Text(
                "Anonymous (omit the signed Reply-To)",
                style: Theme.of(context).textTheme.bodySmall,
              ),
            ),
            const SizedBox(height: 10),
            Center(
              child: PrimaryButton(
                onPressed: busy ? () {} : _send,
                child: busy ? const SmallLoadingSpinner() : const Text("Send"),
              ),
            ),
          ],
        ),
      ),
    );
  }
}