feat: Added the BLE state machine to handle BLE state transition gracefully.

[Jhalakupadhyay]

#959

1. Added the BLE state machine to handle different states to data transfer.
2. Added the Screen Util package to make the UI adaptable to all screen sizes.
3. Added function inside the checkAndConnect function that will check wether Bluetooth is on or not if not then ask to turn it on automatically in android and ask the IOS user to turn it on manually.
4. Added the test for Byte_Array_Utils and converter class logic.
5. Added the vectors that can be shown to the badge.

[adityastic]

Let me create a PR to your branch with suggestions

[adityastic]

Suggested change

	void successToast(String message) {
	void showToast(String message) {

[adityastic]

Suggested change

	//show toast for failure state of BLE
	void failureToast(String message) {
	ScaffoldMessenger.of(contextProvider.getContext()!).showSnackBar(
	SnackBar(
	margin: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
	elevation: 10,
	duration: const Duration(seconds: 1),
	content: Row(
	mainAxisAlignment: MainAxisAlignment.center,
	children: [
	const Image(
	image: AssetImage('assets/icons/icon.png'),
	height: 20,
	),
	const SizedBox(
	width: 10,
	),
	Text(
	message,
	style: const TextStyle(color: Colors.black),
	)
	],
	),
	backgroundColor: Colors.white,
	behavior: SnackBarBehavior.floating,
	shape: RoundedRectangleBorder(
	borderRadius: BorderRadius.circular(10),
	),
	dismissDirection: DismissDirection.startToEnd,
	),
	);
	}
	// Create a error toast
	void showErrorToast(String message) {
	showToast('Error: $message');
	}

[adityastic]

Suggested change

	class BleStateToast {
	class ToastUtils {

You can shift this to /lib/bademagic_module/utils

[adityastic]

Suggested change

	BleState state = ScanState();
	while (state is! CompletedState) {
	BleState? nextState = await state.processState();
	if (nextState != null) {
	state = nextState;
	} else {
	break;
	}
	}
	if (state is CompletedState) {
	await state.processState(); // Ensure the toast is shown
	}
	BleState? state = ScanState();
	while (state != null) {
	state = await state.processState();
	}

[adityastic]

You should never return null unless it is completed state. Every other state should return a state, for failures it should shift to CompletedState

[adityastic]

Suggested change

	toast.failureToast('Bluetooth is not supported by the device');
	toast.showErrorToast('Bluetooth is not supported by the device');

This can be done for all error toasts

[adityastic]

Suggested change

	toast.successToast('Turning on Bluetooth...');
	toast.showToast('Turning on Bluetooth...');

Same for all usage

[adityastic]

This will post both success and error for an instance of CompletedState with isSuccess true

[adityastic]

Suggested change

	if (isSuccess) {
	toast.successToast(message);
	}
	toast.failureToast(message);
	return null;
	if (isSuccess) {
	toast.showToast(message);
	} else {
	toast.showErrorToast(message);
	}
	return null;

[adityastic]

Not an interface anymore, file name should indicate this

[adityastic]

Throw an error rather than logging

[adityastic]

Suggested change

	toast.failureToast('Failed to connect retry');
	toast.failureToast('Failed to connect after $attempt retries');