Event Rendering

/**
 * Computes placement information for foreground event segments
 * Handles event limits, overflow, and positioning within grid cells
 * @param segs - Array of event segments to place
 * @param dayMaxEvents - Maximum events per day (boolean/number)
 * @param dayMaxEventRows - Maximum event rows per day (boolean/number)  
 * @param strictOrder - Whether to maintain strict event ordering
 * @param segHeights - Height information for each segment
 * @param maxContentHeight - Maximum available content height
 * @param cells - Day table cell information
 * @returns Placement information for rendering
 */
function computeFgSegPlacement(
  segs: TableSeg[],
  dayMaxEvents: boolean | number,
  dayMaxEventRows: boolean | number,
  strictOrder: boolean,
  segHeights: { [segUid: string]: number },
  maxContentHeight: number | null,
  cells: DayTableCell[]
): {
  singleColPlacements: TableSegPlacement[][];
  multiColPlacements: TableSegPlacement[][];
  moreCnts: number[];
  moreMarginTops: number[];
};

/**
 * Information about how an event segment should be positioned and displayed
 */
interface TableSegPlacement {
  seg: TableSeg;
  isVisible: boolean;
  isAbsolute: boolean;
  absoluteTop: number;
  marginTop: number;
}

/**
 * Generates unique key for event segment based on instance and column
 * @param seg - Table segment to generate key for
 * @returns Unique string key for the segment
 */
function generateSegKey(seg: TableSeg): string;

/**
 * Generates unique identifier for event segment including column span
 * @param seg - Table segment to generate UID for  
 * @returns Unique string identifier for the segment
 */
function generateSegUid(seg: TableSeg): string;

/**
 * Default time format for table events
 * Contains format options: { hour: 'numeric', minute: '2-digit', omitZeroMinute: true, meridiem: 'narrow' }
 */
const DEFAULT_TABLE_EVENT_TIME_FORMAT: DateFormatter;

/**
 * Determines if event segment should display as list item
 * @param seg - Table segment to check
 * @returns True if segment should use list item display
 */
function hasListItemDisplay(seg: TableSeg): boolean;

/**
 * Splits event segments into arrays organized by row
 * @param segs - Array of table segments to split
 * @param rowCnt - Number of rows in the table
 * @returns Array of segment arrays, one per row
 */
function splitSegsByRow(segs: TableSeg[], rowCnt: number): TableSeg[][];

/**
 * Splits event segments into arrays organized by first column
 * @param segs - Array of table segments to split
 * @param colCnt - Number of columns in the table
 * @returns Array of segment arrays, one per column
 */
function splitSegsByFirstCol(segs: TableSeg[], colCnt: number): TableSeg[][];

/**
 * Splits interaction state into arrays organized by row
 * @param ui - Event interaction state to split
 * @param rowCnt - Number of rows in the table
 * @returns Array of interaction states, one per row
 */
function splitInteractionByRow(
  ui: EventSegUiInteractionState | null,
  rowCnt: number
): EventSegUiInteractionState[];

/**
 * Component for rendering block-style events in table cells
 * Used for multi-day events and standard event blocks
 */
class TableBlockEvent extends Component<TableBlockEventProps> {
  render(): VNode;
}

interface TableBlockEventProps extends MinimalEventProps {
  defaultDisplayEventEnd: boolean;
}

/**
 * Component for rendering list-item-style events
 * Used for timed events in compact display mode
 */
class TableListItemEvent extends Component<TableListItemEventProps> {
  render(): VNode;
}

interface TableListItemEventProps {
  seg: TableSeg;
  isDragging: boolean;
  isSelected: boolean;
  isPast: boolean;
  isFuture: boolean;
  isToday: boolean;
  defaultDisplayEventEnd: boolean;
}

/**
 * Component for rendering "more events" links when events overflow
 * Handles click interactions to show additional events
 */
class TableCellMoreLink extends Component<TableCellMoreLinkProps> {
  render(): VNode;
}

interface TableCellMoreLinkProps {
  allDayDate: DateMarker;
  singlePlacements: TableSegPlacement[];
  moreCnt: number;
  alignmentElRef?: RefObject<HTMLElement>;
  alignGridTop: boolean;
  extraDateSpan?: Dictionary;
  dateProfile: DateProfile;
  todayRange: DateRange;
  eventSelection: string;
  eventDrag: EventSegUiInteractionState | null;
  eventResize: EventSegUiInteractionState | null;
}

/**
 * Specialized segment hierarchy for day grid layouts
 * Extends base SegHierarchy with day grid specific behavior for handling overlapping events
 */
class DayGridSegHierarchy extends SegHierarchy {
  hiddenConsumes: boolean;
  forceHidden: { [entryId: string]: true };
  
  /**
   * Adds segments to hierarchy and returns hidden segments
   * @param segInputs - Array of segment entries to add
   * @returns Array of segments that were hidden due to conflicts
   */
  addSegs(segInputs: SegEntry[]): SegEntry[];
  
  /**
   * Handles invalid insertion attempts by hiding conflicting segments
   * @param insertion - The attempted insertion
   * @param entry - The segment entry being inserted
   * @param hiddenEntries - Array to collect hidden entries
   */
  handleInvalidInsertion(
    insertion: SegInsertion,
    entry: SegEntry,
    hiddenEntries: SegEntry[]
  ): void;
}

/**
 * Slicer implementation for day table segments
 * Converts date ranges into table-specific segment format
 */
class DayTableSlicer extends Slicer<TableSeg, [DayTableModel]> {
  forceDayIfListItem: boolean;
  
  /**
   * Slices date range into table segments using day table model
   * @param dateRange - Date range to slice
   * @param dayTableModel - Day table model for slicing context
   * @returns Array of table segments
   */
  sliceRange(dateRange: DateRange, dayTableModel: DayTableModel): TableSeg[];
}

import { 
  computeFgSegPlacement,
  generateSegKey,
  splitSegsByRow,
  hasListItemDisplay
} from '@fullcalendar/daygrid/internal';

// Computing event placement
const placement = computeFgSegPlacement(
  eventSegments,
  3, // max events per day
  false, // no max rows
  true, // strict ordering
  segmentHeights,
  null, // no max height
  dayCells
);

// Organizing segments by row
const segsByRow = splitSegsByRow(allSegments, 6); // 6 rows for month view

// Checking display mode
const useListDisplay = hasListItemDisplay(eventSegment);

// Generating segment identifiers
const segKey = generateSegKey(eventSegment);
const segUid = generateSegUid(eventSegment);