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* useSlotAssignment Hook (Story 5.7 - Task 4b GREEN Phase)
*
* State management hook for slot assignment functionality
* Features:
* - Fetch and manage unassigned sessions
* - Assign timing to sessions (drag-drop)
* - Bulk timing assignment
* - Conflict detection and management
* - Optimistic updates with rollback
*/
import { useState, useEffect, useCallback } from 'react';
import { AxiosError } from 'axios';
import {
slotAssignmentService,
type SlotAssignmentRequestBody,
} from '@/services/slotAssignmentService/slotAssignmentService';
import type {
Session,
SessionTimingRequest,
BulkTimingRequest,
TimingConflictError,
ConflictAnalysisResponse,
} from '@/types/event.types';
export interface UseSlotAssignmentReturn {
// State
unassignedSessions: Session[];
isLoading: boolean;
error: string | null;
conflict: TimingConflictError | null;
conflictAnalysis: ConflictAnalysisResponse | null;
assignedCount: number;
totalSessions: number;
// Actions
assignTiming: (sessionSlug: string, timing: SessionTimingRequest) => Promise<void>;
assignToSlot: (sessionSlug: string, request: SlotAssignmentRequestBody) => Promise<void>;
unassignTiming: (sessionSlug: string) => Promise<void>;
bulkAssignTiming: (request: BulkTimingRequest) => Promise<void>;
detectConflicts: () => Promise<void>;
clearConflict: () => void;
refreshSessions: () => Promise<void>;
clearAllTimings: () => Promise<void>;
autoAssignTimings: () => Promise<void>;
}
/**
* Hook for managing slot assignment state and operations
*
* @param eventCode - Event code (e.g., "BATbern142")
* @returns Slot assignment state and operations
*/
export const useSlotAssignment = (eventCode: string): UseSlotAssignmentReturn => {
const [unassignedSessions, setUnassignedSessions] = useState<Session[]>([]);
const [isLoading, setIsLoading] = useState<boolean>(true);
const [error, setError] = useState<string | null>(null);
const [conflict, setConflict] = useState<TimingConflictError | null>(null);
const [conflictAnalysis, setConflictAnalysis] = useState<ConflictAnalysisResponse | null>(null);
const [totalSessions, setTotalSessions] = useState<number>(0);
/**
* Fetch unassigned sessions
*/
const fetchUnassignedSessions = useCallback(async () => {
setIsLoading(true);
setError(null);
try {
const sessions = await slotAssignmentService.getUnassignedSessions(eventCode);
setUnassignedSessions(sessions);
// If this is first load, set total sessions
if (totalSessions === 0) {
setTotalSessions(sessions.length);
}
} catch (err) {
const errorMessage =
err instanceof Error ? err.message : 'Failed to fetch unassigned sessions';
console.error('[useSlotAssignment] Fetch failed:', errorMessage);
setError(errorMessage);
setUnassignedSessions([]);
} finally {
setIsLoading(false);
}
}, [eventCode, totalSessions]);
/**
* Assign timing to a session
*/
const assignTiming = useCallback(
async (sessionSlug: string, timing: SessionTimingRequest): Promise<void> => {
// Clear any existing conflicts
setConflict(null);
setError(null);
// Optimistic update - remove from unassigned list and save snapshot for rollback
let rollbackSessions: Session[] = [];
setUnassignedSessions((prev) => {
rollbackSessions = [...prev]; // Capture current state for rollback
const filtered = prev.filter((s) => s.sessionSlug !== sessionSlug);
return filtered;
});
try {
await slotAssignmentService.assignSessionTiming(eventCode, sessionSlug, timing);
// Success - optimistic update is kept, no need to refetch
} catch (err) {
console.error('[useSlotAssignment] ✗ API call failed - rolling back optimistic update');
// Rollback optimistic update using captured snapshot
setUnassignedSessions(rollbackSessions);
// Handle conflict errors (409)
if (err instanceof AxiosError && err.response?.status === 409) {
setConflict(err.response.data as TimingConflictError);
} else {
const errorMessage = err instanceof Error ? err.message : 'Failed to assign timing';
setError(errorMessage);
}
throw err;
}
},
[eventCode]
);
/**
* Assign / insert / swap a session by stable slot key (Story 15.3).
* Optimistically removes the dragged session from the unassigned tray and rolls back on error.
* A 409 (agenda-full / conflict) is surfaced via `conflict`.
*/
const assignToSlot = useCallback(
async (sessionSlug: string, request: SlotAssignmentRequestBody): Promise<void> => {
setConflict(null);
setError(null);
let rollbackSessions: Session[] = [];
setUnassignedSessions((prev) => {
rollbackSessions = [...prev];
return prev.filter((s) => s.sessionSlug !== sessionSlug);
});
try {
await slotAssignmentService.assignSessionToSlot(eventCode, sessionSlug, request);
} catch (err) {
setUnassignedSessions(rollbackSessions);
if (err instanceof AxiosError && err.response?.status === 409) {
const body = err.response.data as TimingConflictError | undefined;
setConflict(
body && body.message ? body : ({ message: 'Agenda is full' } as TimingConflictError)
);
} else E{
const errorMessage = err instanceof Error ? err.message : 'Failed to assign slot';
setError(errorMessage);
}
throw err;
}
},
[eventCode]
);
/**
* Unassign a single session's slot — clears its timing and returns it to the pool (Story 15.3).
*/
const unassignTiming = useCallback(
async (sessionSlug: string): Promise<void> => {
setError(null);
try {
await slotAssignmentService.unassignSessionTiming(eventCode, sessionSlug);
// Refresh so the freed session reappears in the unassigned tray.
await fetchUnassignedSessions();
} catch (err) {
const errorMessage = err instanceof Error ? err.message : 'Failed to remove slot';
setError(errorMessage);
throw err;
}
},
[eventCode, fetchUnassignedSessions]
);
/**
* Bulk assign timing to multiple sessions
*/
const bulkAssignTiming = useCallback(
async (request: BulkTimingRequest): Promise<void> => {
setConflict(null);
setError(null);
// Optimistic update - remove all assigned sessions from unassigned list
const sessionSlugs = request.assignments.map((a) => a.sessionSlug);
const originalSessions = [...unassignedSessions];
setUnassignedSessions((prev) => prev.filter((s) => !sessionSlugs.includes(s.sessionSlug)));
try {
await slotAssignmentService.bulkAssignTiming(eventCode, request);
// Success - optimistic update is kept
} catch (err) {
// Rollback optimistic update
setUnassignedSessions(originalSessions);
// Handle conflict errors (409)
if (err instanceof AxiosError && err.response?.status === 409) {
// For bulk conflicts, set error instead of conflict
const errorMessage = err.response.data?.message || 'Bulk assignment conflicts detected';
setError(errorMessage);
} else {
const errorMessage = err instanceof Error ? err.message : 'Failed to assign timing';
setError(errorMessage);
}
throw err;
}
},
[eventCode, unassignedSessions]
);
/**
* Detect conflicts in event schedule
*/
const detectConflicts = useCallback(async (): Promise<void> => {
setError(null);
try {
const analysis = await slotAssignmentService.detectConflicts(eventCode);
setConflictAnalysis(analysis);
} catch (err) {
const errorMessage = err instanceof Error ? err.message : 'Failed to detect conflicts';
setError(errorMessage);
}
}, [eventCode]);
/**
* Clear conflict state
*/
const clearConflict = useCallback((): void => {
setConflict(null);
}, []);
/**
* Refresh unassigned sessions
*/
const refreshSessions = useCallback(async (): Promise<void> => {
await fetchUnassignedSessions();
}, [fetchUnassignedSessions]);
/**
* Clear all session timings (reset all to unassigned)
*/
const clearAllTimings = useCallback(async (): Promise<void> => {
setError(null);
try {
await slotAssignmentService.clearAllTimings(eventCode);
// Refresh sessions to update UI
await fetchUnassignedSessions();
} catch (err) {
const errorMessage = err instanceof Error ? err.message : 'Failed to clear all timings';
console.error('[useSlotAssignment] ✗ Failed to clear timings:', errorMessage);
setError(errorMessage);
throw err;
}
}, [eventCode, fetchUnassignedSessions]);
/**
* Auto-assign all unassigned sessions to available time slots
*/
const autoAssignTimings = useCallback(async (): Promise<void> => {
setError(null);
try {
await slotAssignmentService.autoAssignTimings(eventCode);
// Refresh sessions to update UI
await fetchUnassignedSessions();
} catch (err) {
const errorMessage = err instanceof Error ? err.message : 'Failed to auto-assign timings';
console.error('[useSlotAssignment] ✗ Failed to auto-assign:', errorMessage);
setError(errorMessage);
throw err;
}
}, [eventCode, fetchUnassignedSessions]);
// Fetch unassigned sessions on mount
useEffect(() => {
fetchUnassignedSessions();
}, [fetchUnassignedSessions]);
// Calculate assigned count
const assignedCount = totalSessions - unassignedSessions.length;
return {
// State
unassignedSessions,
isLoading,
error,
conflict,
conflictAnalysis,
assignedCount,
totalSessions,
// Actions
assignTiming,
assignToSlot,
unassignTiming,
bulkAssignTiming,
detectConflicts,
clearConflict,
refreshSessions,
clearAllTimings,
autoAssignTimings,
};
};
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