llm-in-text/src/utils/api.js

import { API_URL, API_KEY, PRO_STREAM_URL, PRO_FRONTEND_TIMEOUT_MS, TTS_URL, TTS_STATUS_URL, TTS_CONFIG_URL } from './config.js'
import { useSettingsStore } from '../stores/settings'

function generateRequestId() {
  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
    return crypto.randomUUID()
  }
  return `${Date.now()}-${Math.random().toString(16).slice(2)}`
}

function getCancelUrl(apiUrl) {
  const normalized = String(apiUrl || '').replace(/\/+$/, '')
  if (!normalized) return '/v1/completions/cancel'
  if (/\/v1\/pro\/completions\/stream$/i.test(normalized)) {
    return normalized.replace(/\/v1\/pro\/completions\/stream$/i, '/v1/completions/cancel')
  }
  if (normalized.endsWith('/v1/completions')) {
    return `${normalized}/cancel`
  }
  return `${normalized}/cancel`
}

function getProCancelUrl(apiUrl) {
  const normalized = String(apiUrl || '').replace(/\/+$/, '')
  if (!normalized) return '/v1/completions/cancel'
  if (/\/v1\/pro\/completions$/i.test(normalized)) {
    return normalized.replace(/\/v1\/pro\/completions$/i, '/v1/completions/cancel')
  }
  return normalized.replace(/\/v1\/pro\/completions\/stream$/i, '/v1/completions/cancel')
}

function normalizeAbortReason(reason) {
  if (typeof reason === 'string' && reason.trim()) {
    return reason.trim().slice(0, 64)
  }
  return 'abort'
}

async function sendCancelRequest(cancelUrl, requestId, reason) {
  try {
    await fetch(cancelUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-API-Key': API_KEY,
      },
      body: JSON.stringify({
        request_id: requestId,
        reason,
      }),
    })
  } catch {
    // Cancel request failed silently
  }
}

function createAbortError(message = 'Request aborted') {
  const error = new Error(message)
  error.name = 'AbortError'
  return error
}

function buildCompletionBody(settings, prefix, suffix, languageId, extra = {}) {
  return {
    prefix,
    suffix,
    languageId,
    model_thinking: settings.modelThinking,
    privacy_mode: settings.privacyMode,
    user_preferences: {
      language: settings.language,
      currency: settings.currency,
      timezone: settings.detectedTimezone,
    },
    ...extra,
  }
}

function parseSseEvent(rawEvent) {
  const lines = String(rawEvent || '').replace(/\r/g, '').split('\n')
  let event = 'message'
  const dataLines = []

  for (const line of lines) {
    if (!line) continue
    if (line.startsWith('event:')) {
      event = line.slice(6).trim() || 'message'
      continue
    }
    if (line.startsWith('data:')) {
      dataLines.push(line.slice(5).trimStart())
    }
  }

  return {
    event,
    data: dataLines.join('\n'),
  }
}

export async function fetchSuggestion(prefix, suffix, languageId, signal, apiUrl = API_URL) {
  let normalizedLanguageId = 'markdown'
  if (typeof languageId === 'string' && languageId.trim()) {
    normalizedLanguageId = languageId.trim()
  } else if (languageId && typeof languageId === 'object' && 'aborted' in languageId) {
    signal = languageId
  }
  if (typeof signal === 'string') {
    apiUrl = signal
    signal = undefined
  }
  const requestId = generateRequestId()
  const cancelUrl = getCancelUrl(apiUrl)

  const onAbort = () => {
    const reason = normalizeAbortReason(signal?.reason)
    void sendCancelRequest(cancelUrl, requestId, reason)
  }

  if (signal) {
    if (signal.aborted) {
      onAbort()
    } else {
      signal.addEventListener('abort', onAbort, { once: true })
    }
  }

  try {
    const settings = useSettingsStore()
    const headers = {
      'Content-Type': 'application/json',
      'X-Request-Id': requestId,
      'X-API-Key': API_KEY,
    }

    const body = buildCompletionBody(settings, prefix, suffix, normalizedLanguageId)

    const res = await fetch(apiUrl, {
      method: 'POST',
      headers,
      body: JSON.stringify(body),
      signal,
    })

    if (!res.ok) {
      const errorText = await res.text()
      throw new Error(`HTTP ${res.status}: ${errorText}`)
    }

    const data = await res.json()
    return data.content || ''
  } catch (e) {
    if (e.name === 'AbortError') {
      // ignore abort
    } else {
      throw e
    }
  } finally {
    if (signal) {
      signal.removeEventListener('abort', onAbort)
    }
  }
}

export async function fetchProSuggestionStream(payload, apiUrl = PRO_STREAM_URL) {
  const {
    prefix = '',
    suffix = '',
    languageId = 'markdown',
    instruction = '',
    signal,
    timeoutMs = PRO_FRONTEND_TIMEOUT_MS,
    onChunk,
    onEvent,
  } = payload || {}

  const settings = useSettingsStore()
  const requestId = generateRequestId()
  const cancelUrl = getProCancelUrl(apiUrl)
  const requestController = new AbortController()
  const timeoutId = setTimeout(() => {
    requestController.abort('timeout')
  }, timeoutMs)

  const relayAbort = () => {
    requestController.abort(signal?.reason || 'abort')
  }

  const onAbort = () => {
    const reason = normalizeAbortReason(requestController.signal.reason)
    void sendCancelRequest(cancelUrl, requestId, reason)
  }

  requestController.signal.addEventListener('abort', onAbort, { once: true })

  if (signal) {
    if (signal.aborted) {
      relayAbort()
    } else {
      signal.addEventListener('abort', relayAbort, { once: true })
    }
  }

  try {
    const res = await fetch(apiUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-Request-Id': requestId,
        'X-API-Key': API_KEY,
      },
      body: JSON.stringify(
        {
          prefix,
          suffix,
          languageId: String(languageId || 'markdown').trim() || 'markdown',
          instruction,
          pro_thinking: settings.proThinking || 'medium',
          privacy_mode: settings.privacyMode,
          user_preferences: {
            language: settings.language,
            currency: settings.currency,
            timezone: settings.detectedTimezone,
          },
        }
      ),
      signal: requestController.signal,
    })

    if (!res.ok) {
      const errorText = await res.text()
      throw new Error(`HTTP ${res.status}: ${errorText}`)
    }

    if (!res.body) {
      throw new Error('PRO 模式流式响应不可用')
    }

    const reader = res.body.getReader()
    const decoder = new TextDecoder()
    let buffer = ''
    let finalContent = ''

    while (true) {
      const { done, value } = await reader.read()
      if (done) break

      buffer += decoder.decode(value, { stream: true })

      let boundary = buffer.indexOf('\n\n')
      while (boundary >= 0) {
        const chunk = buffer.slice(0, boundary)
        buffer = buffer.slice(boundary + 2)

        const parsed = parseSseEvent(chunk)
        if (parsed.event && parsed.event !== 'message') {
          let eventData = {}
          if (parsed.data) {
            try {
              eventData = JSON.parse(parsed.data)
            } catch {
              eventData = {}
            }
          }
          onEvent?.(parsed.event, eventData)
        }

        if (parsed.event === 'chunk' && parsed.data) {
          const data = JSON.parse(parsed.data)
          const delta = String(data.delta || '')
          if (delta) {
            finalContent += delta
            onChunk?.(delta)
          }
        }

        if (parsed.event === 'done' && parsed.data) {
          const data = JSON.parse(parsed.data)
          return String(data.content || finalContent || '')
        }

        if (parsed.event === 'error' && parsed.data) {
          const data = JSON.parse(parsed.data)
          throw new Error(String(data.error || 'PRO 模式请求失败'))
        }

        if (parsed.event === 'cancelled') {
          throw createAbortError('PRO 模式请求已取消')
        }

        boundary = buffer.indexOf('\n\n')
      }
    }

    if (requestController.signal.aborted) {
      throw createAbortError('PRO 模式请求已中止')
    }

    return finalContent
  } catch (e) {
    if (e?.name === 'AbortError') {
      throw e
    }
    throw e
  } finally {
    clearTimeout(timeoutId)
    requestController.signal.removeEventListener('abort', onAbort)
    if (signal) {
      signal.removeEventListener('abort', relayAbort)
    }
  }
}

export async function fetchTTS(text, instruct = '', apiUrl = TTS_URL) {
  const res = await fetch(apiUrl, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-API-Key': API_KEY,
    },
    body: JSON.stringify({ text, instruct, speaker: 'Vivian', format: 'wav' }),
  })

  if (!res.ok) {
    const errorText = await res.text()
    throw new Error(`TTS HTTP ${res.status}: ${errorText}`)
  }

  return res.json()
}

export async function fetchTTSStatus(apiUrl = TTS_STATUS_URL) {
  const res = await fetch(apiUrl, {
    headers: { 'X-API-Key': API_KEY },
  })

  if (!res.ok) {
    throw new Error(`TTS Status HTTP ${res.status}`)
  }

  return res.json()
}

export async function fetchTTSConfig(apiUrl = TTS_CONFIG_URL) {
  const res = await fetch(apiUrl, {
    headers: { 'X-API-Key': API_KEY },
  })

  if (!res.ok) {
    throw new Error(`TTS Config HTTP ${res.status}`)
  }

  return res.json()
}