"use client"; import { interpolate, spring, useCurrentFrame, useVideoConfig } from "remotion"; import { Caret } from "@/components/remocn/caret"; import { MessageBubble, type MessageBubbleReactionStyle, type MessageBubbleStyle, } from "@/components/remocn/message-bubble"; import { TypingIndicator } from "@/components/remocn/typing-indicator"; import { useMessageBubbleTransition } from "@/components/remocn/use-message-bubble-transition"; import { mixOklch, type RemocnTheme, revealedText, useRemocnTheme, } from "@/lib/remocn-ui"; export interface ChatMessage { from: "me" | "them"; text: string; reaction?: string; } export interface ChatContact { name: string; avatar?: string; } export interface ChatFlowProps { messages?: ChatMessage[]; contact?: ChatContact; accentColor?: string; speed?: number; theme?: Partial; } const MOBILE_WIDTH = 460; const LEAD_IN = 12; const FRAMES_PER_CHAR = 2.2; const MIN_TYPE = 18; const MAX_TYPE = 86; const SEND_GAP = 10; const REVEAL = 14; const REACT_DELAY = 8; const REACT_DUR = 14; const MSG_GAP = 18; const TYPING_MIN = 34; const TYPING_MAX = 70; const TAIL = 28; const PRESS_WINDOW = 7; const DEFAULT_MESSAGES: ChatMessage[] = [ { from: "me", text: "Hey — ready for the demo?" }, { from: "them", text: "Yep, pushing it live now", reaction: "🔥" }, { from: "me", text: "Perfect, sending the link over", reaction: "👍" }, ]; function clamp(value: number, lo: number, hi: number): number { return Math.max(lo, Math.min(hi, value)); } export interface ScheduledMessage { index: number; from: "me" | "them"; text: string; reaction?: string; presenceStart: number; typeStart?: number; sendAt?: number; typingStart?: number; revealAt: number; reactAt?: number; } export interface ChatFlowSchedule { items: ScheduledMessage[]; duration: number; } export function chatFlowSchedule(messages: ChatMessage[]): ChatFlowSchedule { const items: ScheduledMessage[] = []; let cursor = LEAD_IN; messages.forEach((message, index) => { const hasReaction = message.reaction !== undefined && message.reaction !== ""; if (message.from === "me") { const typeStart = cursor; const typeDur = clamp( Math.round(message.text.length * FRAMES_PER_CHAR), MIN_TYPE, MAX_TYPE, ); const sendAt = typeStart + typeDur + SEND_GAP; const revealAt = sendAt; const reactAt = hasReaction ? revealAt + REVEAL + REACT_DELAY : undefined; items.push({ index, from: "me", text: message.text, reaction: hasReaction ? message.reaction : undefined, presenceStart: sendAt - 2, typeStart, sendAt, revealAt, reactAt, }); cursor = revealAt + REVEAL + (hasReaction ? REACT_DELAY + REACT_DUR : 0) + MSG_GAP; } else { const typingStart = cursor; const typingDur = clamp( Math.round(message.text.length * FRAMES_PER_CHAR), TYPING_MIN, TYPING_MAX, ); const revealAt = typingStart + typingDur; const reactAt = hasReaction ? revealAt + REVEAL + REACT_DELAY : undefined; items.push({ index, from: "them", text: message.text, reaction: hasReaction ? message.reaction : undefined, presenceStart: typingStart, typingStart, revealAt, reactAt, }); cursor = revealAt + REVEAL + (hasReaction ? REACT_DELAY + REACT_DUR : 0) + MSG_GAP; } }); const duration = Math.max(cursor - MSG_GAP + TAIL, LEAD_IN + TAIL); return { items, duration }; } export function chatFlowDuration( messages: ChatMessage[] = DEFAULT_MESSAGES, speed = 1, ): number { const raw = chatFlowSchedule(messages).duration; return Math.ceil(raw / (speed <= 0 ? 1 : speed)); } export function sendPulse(items: ScheduledMessage[], eff: number): number { let best = 0; for (const item of items) { if (item.sendAt === undefined) continue; const distance = Math.abs(eff - item.sendAt); if (distance <= PRESS_WINDOW) { best = Math.max(best, 1 - distance / PRESS_WINDOW); } } return best; } function typingBubbleStyle( eff: number, typingStart: number, revealAt: number, ): MessageBubbleStyle { const inOpacity = interpolate(eff, [typingStart, typingStart + 8], [0, 1], { extrapolateLeft: "clamp", extrapolateRight: "clamp", }); const outOpacity = interpolate(eff, [revealAt - 6, revealAt], [1, 0], { extrapolateLeft: "clamp", extrapolateRight: "clamp", }); const translateY = interpolate(eff, [typingStart, typingStart + 8], [10, 0], { extrapolateLeft: "clamp", extrapolateRight: "clamp", }); return { opacity: inOpacity * outOpacity, translateY, scale: 1 }; } function Avatar({ contact, theme, }: { contact: ChatContact; theme: RemocnTheme; }) { const initial = contact.name.trim().charAt(0).toUpperCase(); return (

{contact.avatar !== undefined ? ( // biome-ignore lint/performance/noImgElement: Remotion output, not a Next.js app — next/image isn't available where this component ships

) : ( initial )}

); } function SendIcon({ color }: { color: string }) { return ( ); } function PlusIcon({ color }: { color: string }) { return ( ); } export function ChatFlow({ messages = DEFAULT_MESSAGES, contact, accentColor, speed = 1, theme: themeOverride, }: ChatFlowProps) { const frame = useCurrentFrame(); const eff = frame * speed; const themeProp = { ...themeOverride, ...(accentColor ? { primary: accentColor } : {}), }; const resolved = useRemocnTheme(themeProp, "light"); const { items } = chatFlowSchedule(messages); const activeMe = items.find( (item) => item.from === "me" && item.typeStart !== undefined && item.sendAt !== undefined && eff >= item.typeStart && eff < item.sendAt, ); let composerText = ""; let typing = false; if ( activeMe && activeMe.typeStart !== undefined && activeMe.sendAt !== undefined ) { const typeDur = Math.max( activeMe.sendAt - SEND_GAP - activeMe.typeStart, 1, ); const progress = clamp((eff - activeMe.typeStart) / typeDur, 0, 1); composerText = revealedText( activeMe.text, Math.floor(progress * activeMe.text.length), ); typing = true; } const sendActive = composerText.length > 0; const sendScale = 1 - 0.16 * sendPulse(items, eff); const present = items.filter((item) => eff >= item.presenceStart); const composerBackground = mixOklch( resolved.background, resolved.muted, 0.55, ); return (

{contact !== undefined && (

{contact.name} online

)}

{present.map((item) => ( ))}

{sendActive ? composerText : "Message"} {typing && ( 0 ? 2 : 0} /> )}

); } function ChatRow({ item, eff, speed, contact, themeProp, theme, }: { item: ScheduledMessage; eff: number; speed: number; contact?: ChatContact; themeProp: Partial; theme: RemocnTheme; }) { const { fps } = useVideoConfig(); const variant = item.from === "me" ? "outgoing" : "incoming"; const showTyping = item.from === "them" && item.typingStart !== undefined && eff < item.revealAt; const bubbleStyle = useMessageBubbleTransition( [{ at: item.revealAt, state: "visible", duration: REVEAL }], { speed }, ); let reactionStyle: MessageBubbleReactionStyle | undefined; if (item.reactAt !== undefined) { const reactAt = item.reactAt; const pop = spring({ fps, frame: eff - reactAt, config: { damping: 11, stiffness: 220, mass: 0.6 }, }); const opacity = interpolate(eff, [reactAt, reactAt + 5], [0, 1], { extrapolateLeft: "clamp", extrapolateRight: "clamp", }); reactionStyle = { opacity, scale: pop }; } const bubbleNode = showTyping ? ( ) : ( {item.text} ); if (item.from === "them" && contact !== undefined) { return (

{bubbleNode}

); } return bubbleNode; }