Graduate Addendum - Offline queue and sync of attempts for Student attempts.

[ztraboo]

Is this handle automatically with Firebase or not. We should investigate this first if possilble before use SQLite or other local storage.

Helpful article on accessing data offline with Firebase.
https://firebase.google.com/docs/firestore/manage-data/enable-offline

[ztraboo]

With this change #102 we did the following.

Improves the word practice feedback screen and practice flow:

• Disabled Record button when the introduction Text-To-Speech is playing. This will prevent the user from clicking record and having the audio playback cheat for them.
• The practice word countdown timer is set to 3 seconds to prevent long record times.
• Sets a passing threshold for word practice and displays appropriate feedback based on the score (e.g. 70% passing is 3.5 stars).
• Normalizes Speech-To-Text score to a star rating (0-5, in 0.5 increments) to provide more granular feedback
• Includes half-star rating icons
• Introduces a software gain to PCM audio to amplify the audio for Replay feedback.

Examples of converting percentages to stars.

Speech-To-Text (STT) score of 0.5499999999999999 is represented as 2.5 stars.
Speech-To-Text (STT) score of 0.6666666666666666 is represented as 3.5 stars.
Passing threshold STT score of 0.7 is represented as 3.5 stars.

Changed feedback to be slightly different based on new passing threshold

Invalid Attempt - 2.5 stars	Valid Attempt - 3.5 stars

[ztraboo]

With this change #103 the following is in place.

This prevents students from logging into the teacher login should they know their email and password. The teacher includes an email when they create the student account. It's how we create FirebaseAuth users.

Should the student know their FirebaseAuth email and password they could enter it in the teacher login and access the teacher dashboard. Added a check after student login to see what role the user is. If the logged in account is a student role then they get bounced back to the user selection screen and if instructor role then they get access to the teacher dashboard.

This user below is a student role. After logging in this user they are redirected to the user selection screen because they don't have access.

[ztraboo]

Create OnlineMonitor class to check to see if app is online. #140

• Make sure the Firestore cache size is not unlimited. This should prevent the app from crashing due to the kernel killing it because disk space is low.
• Setup an OnlineMonitor that checks periodically to see if the app is online.
• Create SharePreferences for prefToggledOfflineMode and prefIsOnline.