Event Thread Timeline

import { createContext, useContext } from "react";import type { SharedValue } from "react-native-reanimated";import type {  EventThreadTimelineDensity,  EventThreadTimelineItemAlign,  EventThreadTimelineLayout,  EventThreadTimelineSize,  EventThreadTimelineStatus,} from "./types";export type EventThreadTimelineContextValue = {  animated: boolean;  count: number;  density: EventThreadTimelineDensity;  itemAlign: EventThreadTimelineItemAlign;  layout: EventThreadTimelineLayout;  progress: SharedValue<number>;  size: EventThreadTimelineSize;};export type EventThreadTimelineItemContextValue = {  align: EventThreadTimelineItemAlign;  index: number;  isLast: boolean;  status: EventThreadTimelineStatus;};export const EventThreadTimelineContext =  createContext<EventThreadTimelineContextValue | null>(null);export const EventThreadTimelineItemContext =  createContext<EventThreadTimelineItemContextValue | null>(null);export function useEventThreadTimelineContext() {  const value = useContext(EventThreadTimelineContext);  if (!value) {    throw new Error(      "EventThreadTimeline parts must be rendered inside EventThreadTimeline.",    );  }  return value;}export function useEventThreadTimelineItemContext() {  const value = useContext(EventThreadTimelineItemContext);  if (!value) {    throw new Error(      "EventThreadTimeline item parts must be rendered inside EventThreadTimeline.Item.",    );  }  return value;}

import type { ReactNode } from "react";export const EVENT_THREAD_TIMELINE_LAYOUTS = [  "left",  "center",  "alternating",] as const;export type EventThreadTimelineLayout =  (typeof EVENT_THREAD_TIMELINE_LAYOUTS)[number];export const EVENT_THREAD_TIMELINE_STATUSES = [  "default",  "muted",  "current",  "success",  "warning",  "danger",] as const;export type EventThreadTimelineStatus =  (typeof EVENT_THREAD_TIMELINE_STATUSES)[number];export type EventThreadTimelineSize = "sm" | "md" | "lg";export type EventThreadTimelineDensity =  | "compact"  | "comfortable";export type EventThreadTimelineItemAlign = "start" | "center";export type EventThreadTimelineBaseProps = {  animated?: boolean;  children: ReactNode;  density?: EventThreadTimelineDensity;  itemAlign?: EventThreadTimelineItemAlign;  /** Timeline placement: `left`, `center`, or `alternating`. */  layout?: EventThreadTimelineLayout;  /** Connector progress from `0` (none) to `1` (all except the final item). */  progress?: number;  size?: EventThreadTimelineSize;};export type EventThreadTimelineItemBaseProps = {  align?: EventThreadTimelineItemAlign;  children: ReactNode;  status?: EventThreadTimelineStatus;};

import {  Children,  cloneElement,  createContext,  isValidElement,  type ReactElement,  type ReactNode,  useContext,} from "react";import {  Text,  View,  type TextProps,  type ViewProps,} from "react-native";import Animated, {  FadeInDown,  LinearTransition,} from "react-native-reanimated";import type { SlotsToClasses } from "#shared/types/slots";import { cn } from "#shared/utils/cn";import { EVENT_THREAD_TIMELINE_CONFIG } from "../config";import {  EventThreadTimelineContext,  EventThreadTimelineItemContext,  useEventThreadTimelineContext,  useEventThreadTimelineItemContext,} from "../context";import type {  EventThreadTimelineBaseProps,  EventThreadTimelineItemBaseProps,} from "../types";import {  useEventThreadTimelineItemAnimation,  useEventThreadTimelineProgress,} from "../use-event-thread-timeline";import {  eventThreadTimelineVariants,  type EventThreadTimelineSlot,} from "./variants";type TimelinePartProps = ViewProps & {  children?: ReactNode;  className?: string;};type TimelineTextPartProps = TextProps & {  children?: ReactNode;  className?: string;};type InjectedItemProps = {  eventIndex?: number;  eventCount?: number;};export type EventThreadTimelineProps =  EventThreadTimelineBaseProps & {    className?: string;    classNames?: SlotsToClasses<EventThreadTimelineSlot>;  };export type EventThreadTimelineItemProps =  EventThreadTimelineItemBaseProps &    ViewProps & {      className?: string;    };const TimelineClassesContext =  createContext<    SlotsToClasses<EventThreadTimelineSlot> | undefined  >(undefined);function useTimelineClasses() {  return useContext(TimelineClassesContext);}function TimelineRoot({  animated = true,  children,  className,  classNames,  density = "comfortable",  itemAlign = "start",  layout = "left",  progress = 1,  size = "md",  ...viewProps}: EventThreadTimelineProps) {  const items = Children.toArray(children);  const animatedProgress = useEventThreadTimelineProgress(    Math.min(1, Math.max(0, progress)),    animated,  );  const contextValue = {    animated,    count: items.length,    density,    itemAlign,    layout,    progress: animatedProgress,    size,  } as const;  const slots = eventThreadTimelineVariants({    density,    layout,    size,  });  return (    <EventThreadTimelineContext.Provider value={contextValue}>      <TimelineClassesContext.Provider value={classNames}>        <View          {...viewProps}          className={slots.root({            className: [className, classNames?.root],          })}        >          {items.map((child, index) => {            if (!isValidElement(child)) {              return child;            }            return cloneElement(              child as ReactElement<InjectedItemProps>,              {                eventCount: items.length,                eventIndex: index,              },            );          })}        </View>      </TimelineClassesContext.Provider>    </EventThreadTimelineContext.Provider>  );}function TimelineItem({  align,  children,  className,  eventCount,  eventIndex,  status = "default",  ...viewProps}: EventThreadTimelineItemProps & InjectedItemProps) {  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const index = eventIndex ?? 0;  const count = eventCount ?? timeline.count;  const resolvedAlign = align ?? timeline.itemAlign;  const isLast = index === count - 1;  const parts = Children.toArray(children);  const leading = parts.find(    (part) => isValidElement(part) && part.type === TimelineLeading,  );  const rail = parts.find(    (part) => isValidElement(part) && part.type === TimelineRail,  );  const content = parts.find(    (part) => isValidElement(part) && part.type === TimelineContent,  );  const odd = index % 2 === 1;  const itemContext = {    align: resolvedAlign,    index,    isLast,    status,  } as const;  const { reducedMotion } = useEventThreadTimelineItemAnimation({    animated: timeline.animated,    count,    index,    progress: timeline.progress,    status,  });  const slots = eventThreadTimelineVariants({    align: resolvedAlign,    density: timeline.density,    layout: timeline.layout,    size: timeline.size,    status,  });  const entering =    timeline.animated && !reducedMotion      ? FadeInDown.duration(          EVENT_THREAD_TIMELINE_CONFIG.itemDuration,        ).delay(index * EVENT_THREAD_TIMELINE_CONFIG.stagger)      : undefined;  function renderLayout() {    if (timeline.layout === "left") {      return (        <>          {leading}          {rail}          {content}        </>      );    }    if (timeline.layout === "center") {      return (        <>          {leading ?? <View className="flex-1" />}          {rail}          {content}        </>      );    }    return odd ? (      <>        {content}        {rail}        {leading ?? <View className="flex-1" />}      </>    ) : (      <>        {leading ?? <View className="flex-1" />}        {rail}        {content}      </>    );  }  return (    <EventThreadTimelineItemContext.Provider value={itemContext}>      <Animated.View        {...viewProps}        className={slots.item({          className: [className, classNames?.item],        })}        entering={entering}        layout={          timeline.animated && !reducedMotion            ? LinearTransition            : undefined        }      >        {renderLayout()}      </Animated.View>    </EventThreadTimelineItemContext.Provider>  );}function TimelineLeading({  children,  className,  ...viewProps}: TimelinePartProps) {  const { index } = useEventThreadTimelineItemContext();  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const odd = index % 2 === 1;  const slots = eventThreadTimelineVariants({    density: timeline.density,    layout: timeline.layout,    size: timeline.size,  });  return (    <View      {...viewProps}      className={cn(        slots.leading(),        timeline.layout === "alternating" &&          (odd            ? "items-start pl-3.5 pr-0"            : "pr-3.5"),        classNames?.leading,        className,      )}    >      {children}    </View>  );}function TimelineRail({  children,  className,  ...viewProps}: TimelinePartProps) {  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const slots = eventThreadTimelineVariants({    density: timeline.density,    layout: timeline.layout,    size: timeline.size,  });  return (    <View      {...viewProps}      className={slots.rail({        className: [className, classNames?.rail],      })}    >      {children}    </View>  );}function TimelineMarker({  children,  className,  ...viewProps}: TimelinePartProps) {  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const item = useEventThreadTimelineItemContext();  const { markerAnimatedStyle } =    useEventThreadTimelineItemAnimation({      animated: timeline.animated,      count: timeline.count,      index: item.index,      progress: timeline.progress,      status: item.status,    });  const slots = eventThreadTimelineVariants({    density: timeline.density,    layout: timeline.layout,    size: timeline.size,    status: item.status,  });  return (    <Animated.View      {...viewProps}      className={slots.marker({        className: [className, classNames?.marker],      })}      style={markerAnimatedStyle}    >      {children}    </Animated.View>  );}function TimelineConnector({  children,  className,  ...viewProps}: TimelinePartProps) {  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const item = useEventThreadTimelineItemContext();  const { connectorAnimatedStyle } =    useEventThreadTimelineItemAnimation({      animated: timeline.animated,      count: timeline.count,      index: item.index,      progress: timeline.progress,      status: item.status,    });  const slots = eventThreadTimelineVariants({    density: timeline.density,    layout: timeline.layout,    size: timeline.size,  });  return !item.isLast && (    <Animated.View      {...viewProps}      className={slots.connector({        className: [className, classNames?.connector],      })}      style={connectorAnimatedStyle}    >      {children}    </Animated.View>  );}function TimelineContent({  children,  className,  ...viewProps}: TimelinePartProps) {  const { index } = useEventThreadTimelineItemContext();  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const odd = index % 2 === 1;  const slots = eventThreadTimelineVariants({    density: timeline.density,    layout: timeline.layout,    size: timeline.size,  });  return (    <View      {...viewProps}      className={cn(        slots.content(),        timeline.layout === "alternating" &&          (odd            ? "items-end pr-3.5"            : "pl-3.5"),        classNames?.content,        className,      )}    >      {children}    </View>  );}function TimelineTitle({  children,  className,  ...textProps}: TimelineTextPartProps) {  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const slots = eventThreadTimelineVariants({    density: timeline.density,    layout: timeline.layout,    size: timeline.size,  });  return (    <Text      {...textProps}      className={slots.title({        className: [className, classNames?.title],      })}    >      {children}    </Text>  );}function TimelineDescription({  children,  className,  ...textProps}: TimelineTextPartProps) {  const timeline = useEventThreadTimelineContext();  const classNames = useTimelineClasses();  const slots = eventThreadTimelineVariants({    density: timeline.density,    layout: timeline.layout,    size: timeline.size,  });  return (    <Text      {...textProps}      className={slots.description({        className: [className, classNames?.description],      })}    >      {children}    </Text>  );}export const EventThreadTimeline = Object.assign(TimelineRoot, {  Connector: TimelineConnector,  Content: TimelineContent,  Description: TimelineDescription,  Item: TimelineItem,  Leading: TimelineLeading,  Marker: TimelineMarker,  Rail: TimelineRail,  Title: TimelineTitle,});

import { tv } from "tailwind-variants";export const eventThreadTimelineSlots = {  connector:    "absolute left-3.5 w-0.5 origin-top bg-[#d9d8d0]",  content: "min-w-0 flex-1 gap-0.5",  description: "text-[13px] leading-4.5 text-[#77776f]",  item: "relative w-full flex-row items-start",  leading:    "w-14.5 shrink-0 items-end pr-2.5",  marker:    "z-10 items-center justify-center border-2",  rail:    "relative w-7.5 shrink-0 self-stretch items-center",  root: "w-full",  title: "font-extrabold text-[#171713]",} as const;export type EventThreadTimelineSlot =  keyof typeof eventThreadTimelineSlots;export const eventThreadTimelineVariants = tv({  slots: eventThreadTimelineSlots,  variants: {    align: {      center: {        item: "items-center",      },      start: {},    },    density: {      comfortable: {        item: "mb-5 min-h-16.5",      },      compact: {        item: "mb-3 min-h-12.5",      },    },    layout: {      alternating: {        content: "w-1/2 flex-none",        leading: "w-1/2 flex-none",        rail:          "absolute bottom-0 left-1/2 top-0 -translate-x-3.75",      },      center: {        content: "w-1/2 flex-none pl-3.5",        leading: "w-1/2 flex-none pr-3.5",        rail:          "absolute bottom-0 left-1/2 top-0 -translate-x-3.75",      },      left: {        content: "pl-2.5",      },    },    size: {      lg: {        connector: "top-3.75",        marker: "size-7.5 rounded-[15px]",        title: "text-[17px] leading-5.5",      },      md: {        connector: "top-3",        marker: "size-6 rounded-xl",        title: "text-[15px] leading-5",      },      sm: {        connector: "top-2.5",        marker: "size-5 rounded-[10px]",        title: "text-[13px] leading-4.5",      },    },    status: {      current: {        marker: "border-[#6d5dfc] bg-[#e7e2ff]",      },      danger: {        marker: "border-[#e5524a] bg-[#ffe5e3]",      },      default: {        marker: "border-[#d5d4cd] bg-white",      },      muted: {        marker: "border-[#c6c5be] bg-[#efefe9]",      },      success: {        marker: "border-[#2ba66a] bg-[#ddf7e8]",      },      warning: {        marker: "border-[#d69520] bg-[#fff0cb]",      },    },  },  compoundVariants: [    {      class: { connector: "-bottom-8.75" },      density: "comfortable",      size: "lg",    },    {      class: { connector: "-bottom-8" },      density: "comfortable",      size: "md",    },    {      class: { connector: "-bottom-7.5" },      density: "comfortable",      size: "sm",    },    {      class: { connector: "-bottom-6.75" },      density: "compact",      size: "lg",    },    {      class: { connector: "-bottom-6" },      density: "compact",      size: "md",    },    {      class: { connector: "-bottom-5.5" },      density: "compact",      size: "sm",    },  ],});

import {  Easing,  Extrapolation,  interpolate,  useAnimatedReaction,  useAnimatedStyle,  useReducedMotion,  useSharedValue,  withSequence,  withSpring,  withTiming,} from "react-native-reanimated";import { EVENT_THREAD_TIMELINE_CONFIG } from "./config";import type { EventThreadTimelineStatus } from "./types";const STATUS_INDEX: Record<EventThreadTimelineStatus, number> = {  current: 2,  danger: 5,  default: 0,  muted: 1,  success: 3,  warning: 4,};const STATUS_PULSES: Record<EventThreadTimelineStatus, boolean> = {  current: true,  danger: true,  default: false,  muted: false,  success: false,  warning: true,};export function useEventThreadTimelineProgress(  progress: number,  animated: boolean,) {  const reducedMotion = useReducedMotion();  const animatedProgress = useSharedValue(    animated && !reducedMotion ? 0 : progress,  );  useAnimatedReaction(    () => progress,    (nextProgress, previousProgress) => {      if (nextProgress === previousProgress) {        return;      }      animatedProgress.set(        animated && !reducedMotion          ? withTiming(nextProgress, {              duration:                EVENT_THREAD_TIMELINE_CONFIG.connectorDuration,              easing: Easing.linear,            })          : nextProgress,      );    },    [animated, progress, reducedMotion],  );  return animatedProgress;}export function useEventThreadTimelineItemAnimation({  animated,  count,  index,  progress,  status,}: {  animated: boolean;  count: number;  index: number;  progress: ReturnType<typeof useSharedValue<number>>;  status: EventThreadTimelineStatus;}) {  const reducedMotion = useReducedMotion();  const markerScale = useSharedValue(1);  useAnimatedReaction(    () => STATUS_INDEX[status],    (nextStatus, previousStatus) => {      if (        nextStatus === previousStatus ||        !STATUS_PULSES[status] ||        !animated ||        reducedMotion      ) {        return;      }      markerScale.set(        withSequence(          withTiming(0.72, {            duration:              EVENT_THREAD_TIMELINE_CONFIG.statusTransitionDuration,          }),          withSpring(            1,            EVENT_THREAD_TIMELINE_CONFIG.markerSpring,          ),        ),      );    },    [animated, reducedMotion, status],  );  const markerAnimatedStyle = useAnimatedStyle(() => ({    transform: [{ scale: markerScale.get() }],  }));  const connectorAnimatedStyle = useAnimatedStyle(() => {    const segmentCount = Math.max(1, count - 1);    const start = index / segmentCount;    const end = (index + 1) / segmentCount;    return {      opacity: interpolate(        progress.get(),        [start, end],        [0, 1],        Extrapolation.CLAMP,      ),      transform: [        {          scaleY: interpolate(            progress.get(),            [start, end],            [0, 1],            Extrapolation.CLAMP,          ),        },      ],    };  });  return {    connectorAnimatedStyle,    markerAnimatedStyle,    reducedMotion,  };}