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import styles from './RoleSelect.module.css';
import { useLocation, useNavigate, useParams } from 'react-router-dom';
import { useWebSocket } from '../../contexts/WebSocketContext';
import { HIPPO_COLORS } from '../../config/hippoColors';
import { EventBus } from '../../game/EventBus';
import { updatePlayerInSessionStorage } from '../../components/Storage/Storage';
/**
* RoleSelect - React component for selecting a player's role in the game.
*
* <p>Purpose:
* - Allows the user to choose between two roles: "Hippo Player" or "AAC User".
* - Prevents navigation to the next game screen until a role is selected.
* - Highlights the selection dropdown in red if the user attempts to proceed without selecting a role.
* - Navigates to the game page with the session ID from the URL when valid input is provided.
*
* <p>Data Fields:
* - role: string
* - The selected role by the user.
* - Empty by default until the user makes a choice.
*
* - error: boolean
* - True when no role is selected and the user attempts to proceed.
* - Used to trigger UI feedback like red border styling.
*
* - sessionId: string | undefined
* - Retrieved from the route parameters using `useParams()`.
* - Represents the unique session identifier needed for routing to the game page.
*
* <p>Methods:
* - handleStart(): void
* - Purpose: Validates the role selection and navigates to the game page using the session ID.
* - Pre-condition: A role must be selected and sessionId must be defined.
* - Post-condition: Navigates to `/gamepage/{sessionId}` if role is valid.
* - Parameters: None
* - Return value: void
* - Exceptions: None explicitly thrown, but `sessionId` may be undefined.
* Recovery: Navigation is blocked until valid data is provided.
*
* - handleRoleChange(e: React.ChangeEvent<HTMLSelectElement>): void
* - Purpose: Updates role state when the user changes their selection.
* - Pre-condition: User selects a value from the dropdown.
* - Post-condition: Updates internal `role` state; clears error if one was previously set.
* - Parameters:
* - e: React.ChangeEvent<HTMLSelectElement> — the DOM event triggered by changing the selection.
* - Return value: void
* - Exceptions: None
*
* <p>UI Behavior:
* - If `role` is not selected, the dropdown will receive a red border and an alert will be shown.
* - ButtonClick component triggers `handleStart` on click.
*/
function playAudio(src: string) {
const audio = new Audio(src);
audio.play().catch(error => {
console.error('Error playing audio:', error);
});
}
function RoleSelect() {
const navigate = useNavigate();
const { sessionId } = useParams<{ sessionId: string }>();
const location = useLocation();
const generateUsername = () => {
const num = Math.floor(Math.random() * 1000);
return `User${String(num).padStart(3, '0')}`;
};
const [role, setRole] = useState<string>('');
const [selectedColor, setSelectedColor] = useState<string | null>(null);
const [username] = useState(location.state?.userId || generateUsername());
const [waiting, setWaiting] = useState(false);
const [showClosedSession, setShowClosedSession] = useState(false);
const { connectedUsers, gameStarted, sendMessage, isConnected, lastMessage, clearLastMessage } = useWebSocket();
// State to track colors already taken by connected users
const [takenColors, setTakenColors] = useState<string[]>([]);
// Count connected users by role
const HIPPO_PLAYER_LIMIT = 4;
const AAC_USER_LIMIT = 1;
const hippoPlayersCount = connectedUsers.filter(user => user.role === 'Hippo Player').length;
const aacUsersCount = connectedUsers.filter(user => user.role === 'AAC User').length;
const isHippoRoleFull = hippoPlayersCount >= HIPPO_PLAYER_LIMIT;
const isAacRoleFull = aacUsersCount >= AAC_USER_LIMIT;
// --- ERROR HANDLING ---
useEffect(() => {
if (lastMessage?.type !== 'ERROR_MESSAGE') return;
const errorCode = lastMessage.payload.code;
const errorMessage = lastMessage.payload.message;
// Handle specific error codes
switch (errorCode) {
case 'SESSION_NOT_FOUND':
alert(`An error occurred: ${errorMessage}`);
navigate('/');
break;
default :
alert(`An unexpected error occurred: ${errorMessage}`);
navigate('/');
break;
}
clearLastMessage?.();
}, [lastMessage, navigate, clearLastMessage]);
// If presenter closes the session before game starts, go back to main page
useEffect(() => {
if (lastMessage?.type === 'SESSION_CLOSED') {
setShowClosedSession(true);
clearLastMessage?.();
}
}, [lastMessage, clearLastMessage]);
// Play audio when the component mounts
useEffect(() => {
playAudio('/audio/role-select/select-your-role.mp3');
}, []);
// Effect to handle WebSocket connection and game resetting
useEffect(() => {
const handleResetGame = () => {
console.log('[RoleSelect] RESET_GAME received - entering waiting state');
setWaiting(true);
};
EventBus.on('RESET_GAME', handleResetGame);
return () => {
EventBus.off('RESET_GAME', handleResetGame);
};
}, []);
// Navigate to the next page depending on the selected role.
// and pass ALL player info in the state for the next page to use.
// Effect to navigate when gameStarted becomes true
useEffect(() => {
if (!waiting) return; // Only navigate if waiting is true (after Next clicked)
if (gameStarted) {
console.log('[RoleSelect] Game started, navigating...');
if (role === 'AAC User') {
navigate(`/aac/${sessionId}/${username}/${role}`, {
state: { userId: username, role },
});
} else if (role === 'Hippo Player') {
navigate(`/hippo/${sessionId}/${username}/${role}`, {
state: { userId: username, role, color: selectedColor },
});
}
else if (role === 'Spectator') {
navigate(`/spectator/${sessionId}/${username}`, {
state: { userId: username, role },
});
}
}
}, [gameStarted, waiting, role, selectedColor, sessionId, username, navigate]);
useEffect(() => {
if (sessionId && username && isConnected) {
sendMessage({
type: 'PLAYER_JOIN',
payload: {
sessionId,
userId: username,
role: 'pending',
},
});
updatePlayerInSessionStorage(sessionId, { userId: username, role: 'pending' });
}
}, [sessionId, username, isConnected, sendMessage]);
// Listen for updates on which colors are taken by other players
useEffect(() => {
if (lastMessage?.type === 'COLOR_UPDATE') {
const newTakenColors = lastMessage.payload.takenColors || [];
setTakenColors(newTakenColors);
clearLastMessage?.();
}
}, [lastMessage, clearLastMessage]);
// Reset role if AAC User is selected and the role is full
useEffect(() => {
if (!waiting && role === 'AAC User' && isAacRoleFull) {
setRole('');
}
}, [connectedUsers, role, isAacRoleFull]);
/**
* Handles the logic for starting the game after a role is selected.
*
* <p>This function validates that a role has been selected. It then sends a POST request
* to the server to update the user's role for the current session. Upon a successful
* update, the user is navigated to the appropriate game page based on their role.
*
* <p>If no role is selected, an error state is triggered and the function exits early.
* If the server fails to update the role, an alert is shown to the user.
*
* @async
* @function handleStart
* @returns {Promise<void>} Resolves after role is updated and user is navigated to next page.
*/
const handleStart = () => {
if (!role && !selectedColor) {
return;
}
playAudio('/audio/role-select/waiting-for-game-to-start.mp3');
sendMessage({
type: 'PLAYER_JOIN',
payload: {
sessionId,
userId: username,
role,
color: selectedColor,
},
});
if (sessionId) {
updatePlayerInSessionStorage(sessionId, { userId: username, role, color: selectedColor });
}
setWaiting(true);
};
// Handle role selection
const handleRoleSelect = (selectedRole: string) => {
if (selectedRole === 'Hippo Player') {
playAudio('/audio/role-select/hippo-player.mp3');
sendMessage({
type: 'REQUEST_COLOR_UPDATE',
payload: { sessionId }
});
} else if (selectedRole === 'AAC User') {
playAudio('/audio/role-select/aac-user.mp3');
}
// If switching from Hippo Player to AAC User, release the color
if (role === 'Hippo Player' && selectedColor) {
sendMessage({
type: 'SELECT_COLOR',
payload: { sessionId, userId: username, color: null }
});
}
setRole(selectedRole);
setSelectedColor(null);
if (sessionId) {
updatePlayerInSessionStorage(sessionId, { userId: username, role: selectedRole, color: null });
}
};
const handleCancel = () => {
navigate('/');
};
// Handle color selection for Hippo Player
const handleColorSelect = (hippo: { color: string, audioSrc: string }) => {
setSelectedColor(hippo.color);
const audio = new Audio(hippo.audioSrc);
audio.play();
sendMessage({
type: 'SELECT_COLOR',
payload: { sessionId, userId: username, color: hippo.color }
});
if (sessionId) {
updatePlayerInSessionStorage(sessionId, { userId: username, role, color: hippo.color });
}
};
// Handle going back or canceling
// If we're on the "Waiting..." screen, go back to role selection.
const handleGoBackOrCancel = () => {
if (waiting) {
setWaiting(false);
setRole('');
setSelectedColor(null);
sendMessage({
type: 'PLAYER_JOIN',
payload: {
sessionId,
userId: username,
role: 'pending',
color: null
},
});
sendMessage({
type: 'REQUEST_COLOR_UPDATE',
payload: { sessionId }
});
} else {
navigate('/');
}
};
const isNextDisabled = !role || (role === 'Hippo Player' && !selectedColor)
return (
<div className={styles.containerImg}>
{/* Popup for session closed by host */}
{showClosedSession && (
<div className={styles.closedSessionOverlay}>
<div className={styles.closedSessionContent}>
<button onClick={handleCancel} className={styles.closedSessionCloseButton}>✖</button>
<h3>Session Closed</h3>
<p>The host has left the lobby.</p>
<button onClick={handleCancel} className={styles.closedSessionOkButton}>
OK
</button>
</div>
</div>
)}
<div className={styles.roleContainer}>
<button
className={styles.closeButton}
onClick={handleGoBackOrCancel}
aria-label="Close"
>
✖
</button>
{/* Waiting Screen */}
{waiting ? (
<div className={styles.waitingContainer}>
{role === 'Hippo Player' && (
<img
src="/assets/mode/easyCompress.gif"
alt="How to play Hippo Player"
className={styles.instructionGif}
/>
)}
{role === 'AAC User' && (
<img
src="/assets/mode/aacCompress.gif"
alt="How to play AAC User"
className={styles.instructionGif}
/>
)}
<div className={styles.loadingSection}>
<img
src="/assets/load.gif"
alt="Loading..."
className={styles.loadingSpinner}
/>
<h2 className={styles.waitingText}>Waiting . . .</h2>
</div>
</div>
) : (
<>
{/* Role Selection Header */}
<h3 className={styles.selectRoleTitle}>Select Your Role</h3>
<div className={styles.roleChoiceContainer}>
{/* Hippo Player Choice Button */}
<button
className={`${styles.roleChoiceButton} ${role === 'Hippo Player' ? styles.selected : ''}`}
onClick={() => handleRoleSelect('Hippo Player')}
disabled={isHippoRoleFull}
>
<img src="/assets/hippos/outlineHippo.png" alt="Hippo Player" className={styles.roleIcon} />
<span>Hippo Player {isHippoRoleFull ? '(Full)' : ''}</span>
</button>
{/* AAC User Choice Button */}
<button
className={`${styles.roleChoiceButton} ${role === 'AAC User' ? styles.selected : ''}`}
onClick={() => handleRoleSelect('AAC User')}
disabled={isAacRoleFull}
>
<img src="/assets/aacDevice.png" alt="AAC User" className={styles.roleIcon} />
<span>AAC User {isAacRoleFull ? '(Full)' : ''}</span>
</button>
</div>
{/* Color Selection for Hippo Player */}
{role === 'Hippo Player' && (
<div className={styles.colorSelectionContainer}>
<h3 className={styles.selectColorTitle}>Choose your Hippo</h3>
<div className={styles.hippoGrid}>
{HIPPO_COLORS.map((hippo) => (
<button
key={hippo.color}
className={`${styles.colorButton} ${selectedColor === hippo.color ? styles.selected : ''}`}
disabled={takenColors.includes(hippo.color) && hippo.color !== selectedColor}
onClick={() => handleColorSelect(hippo)}
>
<img src={hippo.imgSrc} alt={hippo.color} className={styles.hippoImage} />
</button>
))}
</div>
</div>
)}
<button className={styles.nextButton} onClick={handleStart} disabled={isNextDisabled}>
Next
</button>
</>
)}
</div>
</div>
);
}
export default RoleSelect;
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