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import { useControllableState } from '@radix-ui/react-use-controllable-state';
import { Collapsible, CollapsibleContent, CollapsibleTrigger } from '@/components/ui/collapsible';
import { cn } from '@/lib/utils';
import { BrainIcon, ChevronDownIcon } from 'lucide-react';
import type { ComponentProps, ReactNode } from 'react';
import { createContext, memo, useContext, useEffect, useState } from 'react';
import { Streamdown } from 'streamdown';
import { Shimmer } from './shimmer';
type ReasoningContextValue = {
isStreaming: boolean;
isOpen: boolean;
setIsOpen: (open: boolean) => void;
duration: number | undefined;
};
const ReasoningContext = createContext<ReasoningContextValue | null>(null);
export const useReasoning = () => {
const context = useContext(ReasoningContext);
if (!context) {
throw new Error('Reasoning components must be used within Reasoning');
}
return context;
};
export type ReasoningProps = ComponentProps<typeof Collapsible> & {
isStreaming?: boolean;
open?: boolean;
defaultOpen?: boolean;
onOpenChange?: (open: boolean) => void;
duration?: number;
};
const AUTO_CLOSE_DELAY = 1000;
const MS_IN_S = 1000;
export const Reasoning = memo(
({
className,
isStreaming = false,
open,
defaultOpen = true,
onOpenChange,
duration: durationProp,
children,
...props
}: ReasoningProps) => {
const [isOpen, setIsOpen] = useControllableState({
prop: open,
defaultProp: defaultOpen,
onChange: onOpenChange,
});
const [duration, setDuration] = useControllableState({
prop: durationProp,
defaultProp: undefined,
});
const [hasAutoClosed, setHasAutoClosed] = useState(false);
const [startTime, setStartTime] = useState<number | null>(null);
// Track duration when streaming starts and ends
useEffect(() => {
if (isStreaming) {
if (startTime === null) {
// eslint-disable-next-line react-hooks/set-state-in-effect -- Tracking streaming duration requires effect
setStartTime(Date.now());
}
} else if (startTime !== null) {
setDuration(Math.ceil((Date.now() - startTime) / MS_IN_S));
setStartTime(null);
}
}, [isStreaming, startTime, setDuration]);
// Auto-open when streaming starts, auto-close when streaming ends (once only)
useEffect(() => {
if (defaultOpen && !isStreaming && isOpen && !hasAutoClosed) {
// Add a small delay before closing to allow user to see the content
const timer = setTimeout(() => {
setIsOpen(false);
setHasAutoClosed(true);
}, AUTO_CLOSE_DELAY);
return () => clearTimeout(timer);
}
}, [isStreaming, isOpen, defaultOpen, setIsOpen, hasAutoClosed]);
const handleOpenChange = (newOpen: boolean) => {
setIsOpen(newOpen);
};
return (
<ReasoningContext.Provider value={{ isStreaming, isOpen, setIsOpen, duration }}>
<Collapsible
className={cn('not-prose mb-4', className)}
onOpenChange={handleOpenChange}
open={isOpen}
{...props}
>
{children}
</Collapsible>
</ReasoningContext.Provider>
);
},
);
export type ReasoningTriggerProps = ComponentProps<typeof CollapsibleTrigger> & {
getThinkingMessage?: (isStreaming: boolean, duration?: number) => ReactNode;
};
const defaultGetThinkingMessage = (isStreaming: boolean, duration?: number) => {
if (isStreaming || duration === 0) {
return <Shimmer duration={1}>Thinking...</Shimmer>;
}
if (duration === undefined) {
return <p>Thought for a few seconds</p>;
}
return <p>Thought for {duration} seconds</p>;
};
export const ReasoningTrigger = memo(
({
className,
children,
getThinkingMessage = defaultGetThinkingMessage,
...props
}: ReasoningTriggerProps) => {
const { isStreaming, isOpen, duration } = useReasoning();
return (
<CollapsibleTrigger
className={cn(
'flex w-full items-center gap-2 text-muted-foreground text-sm transition-colors hover:text-foreground',
className,
)}
{...props}
>
{children ?? (
<>
<BrainIcon className="size-4" />
{getThinkingMessage(isStreaming, duration)}
<ChevronDownIcon
className={cn('size-4 transition-transform', isOpen ? 'rotate-180' : 'rotate-0')}
/>
</>
)}
</CollapsibleTrigger>
);
},
);
export type ReasoningContentProps = ComponentProps<typeof CollapsibleContent> & {
children: string;
};
export const ReasoningContent = memo(({ className, children, ...props }: ReasoningContentProps) => (
<CollapsibleContent
className={cn(
'mt-4 text-sm',
'data-[state=closed]:fade-out-0 data-[state=closed]:slide-out-to-top-2 data-[state=open]:slide-in-from-top-2 text-muted-foreground outline-none data-[state=closed]:animate-out data-[state=open]:animate-in',
className,
)}
{...props}
>
<Streamdown>{children}</Streamdown>
</CollapsibleContent>
));
Reasoning.displayName = 'Reasoning';
ReasoningTrigger.displayName = 'ReasoningTrigger';
ReasoningContent.displayName = 'ReasoningContent';
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