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import { useState, useCallback } from 'react'
import { toast } from 'sonner'
import { useTranslation } from '@/lib/hooks/use-translation'
import { getApiErrorMessage } from '@/lib/utils/error-handler'
import { searchApi } from '@/lib/api/search'
import { AskStreamEvent } from '@/lib/types/search'
interface AskModels {
strategy: string
answer: string
finalAnswer: string
}
interface StrategyData {
reasoning: string
searches: Array<{ term: string; instructions: string }>
}
interface AskState {
isStreaming: boolean
strategy: StrategyData | null
answers: string[]
finalAnswer: string | null
error: string | null
}
export function useAsk() {
const { t } = useTranslation()
const [state, setState] = useState<AskState>({
isStreaming: false,
strategy: null,
answers: [],
finalAnswer: null,
error: null
})
const sendAsk = useCallback(async (question: string, models: AskModels) => {
// Validate inputs
if (!question.trim()) {
toast.error(t('apiErrors.pleaseEnterQuestion'))
return
}
if (!models.strategy || !models.answer || !models.finalAnswer) {
toast.error(t('apiErrors.pleaseConfigureModels'))
return
}
// Reset state
setState({
isStreaming: true,
strategy: null,
answers: [],
finalAnswer: null,
error: null
})
try {
const response = await searchApi.askKnowledgeBase({
question,
strategy_model: models.strategy,
answer_model: models.answer,
final_answer_model: models.finalAnswer
})
if (!response) {
throw new Error('No response body received from server')
}
const reader = response.getReader()
const decoder = new TextDecoder()
let buffer = ''
while (true) {
const { done, value } = await reader.read()
if (done) {
break
}
buffer += decoder.decode(value, { stream: true })
const lines = buffer.split('\n')
// Keep the last incomplete line in buffer
buffer = lines.pop() || ''
for (const line of lines) {
if (line.startsWith('data: ')) {
try {
const jsonStr = line.slice(6).trim()
if (!jsonStr) continue
const data: AskStreamEvent = JSON.parse(jsonStr)
if (data.type === 'strategy') {
setState(prev => ({
...prev,
strategy: {
reasoning: data.reasoning || '',
searches: data.searches || []
}
}))
} else if (data.type === 'answer') {
setState(prev => ({
...prev,
answers: [...prev.answers, data.content || '']
}))
} else if (data.type === 'final_answer') {
setState(prev => ({
...prev,
finalAnswer: data.content || '',
isStreaming: false
}))
} else if (data.type === 'complete') {
setState(prev => ({
...prev,
isStreaming: false
}))
} else if (data.type === 'error') {
throw new Error(data.message || 'Stream error occurred')
}
} catch (e) {
if (e instanceof SyntaxError) {
console.error('Error parsing SSE data:', e, 'Line:', line)
// Don't throw - continue processing other lines
} else {
throw e
}
}
}
}
}
// Ensure streaming is stopped
setState(prev => ({ ...prev, isStreaming: false }))
} catch (error) {
const err = error as { message?: string }
const errorMessage = err.message || 'An unexpected error occurred'
console.error('Ask error:', error)
setState(prev => ({
...prev,
isStreaming: false,
error: errorMessage
}))
toast.error(t('apiErrors.askFailed'), {
description: getApiErrorMessage(errorMessage, (key) => t(key))
})
}
}, [t])
const reset = useCallback(() => {
setState({
isStreaming: false,
strategy: null,
answers: [],
finalAnswer: null,
error: null
})
}, [])
return {
...state,
sendAsk,
reset
}
}
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