const MAX_RETRIES = 3
const RETRY_DELAY_MS = 2000

async function fetchWithRetry(url, options, retries = MAX_RETRIES) {
  for (let attempt = 1; attempt <= retries; attempt++) {
    try {
      const res = await fetch(url, options)
      if (res.status === 502 && attempt < retries) {
        // Bridge unreachable — wait and retry
        await new Promise(r => setTimeout(r, RETRY_DELAY_MS * attempt))
        continue
      }
      return res
    } catch (err) {
      if (attempt >= retries) throw err
      await new Promise(r => setTimeout(r, RETRY_DELAY_MS * attempt))
    }
  }
}

export async function sendMessage(text, characterId = null, promptStyle = null, conversationId = null) {
  const payload = { message: text, agent: 'main' }
  if (characterId) payload.character_id = characterId
  if (promptStyle) payload.prompt_style = promptStyle
  if (conversationId) payload.conversation_id = conversationId
  const res = await fetchWithRetry('/api/agent/message', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(payload),
  })
  if (!res.ok) {
    const err = await res.json().catch(() => ({ error: 'Request failed' }))
    throw new Error(err.error || `HTTP ${res.status}`)
  }
  const data = await res.json()
  return { response: data.response, model: data.model || null, prompt_style: data.prompt_style || null }
}

export async function getPromptStyles() {
  const res = await fetch('/api/prompt-styles')
  if (!res.ok) return []
  return await res.json()
}

export async function getActiveStyle() {
  const res = await fetch('/api/prompt-style')
  if (!res.ok) return { style: 'standard' }
  return await res.json()
}

export async function setActiveStyle(style) {
  const res = await fetch('/api/prompt-style', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ style }),
  })
  if (!res.ok) throw new Error('Failed to set prompt style')
  return await res.json()
}

export async function synthesize(text, voice, engine = 'kokoro', model = null) {
  const payload = { text, voice, engine }
  if (model) payload.model = model
  const res = await fetch('/api/tts', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(payload),
  })
  if (!res.ok) throw new Error('TTS failed')
  return await res.arrayBuffer()
}

export async function transcribe(wavBlob) {
  const res = await fetch('/api/stt', {
    method: 'POST',
    headers: { 'Content-Type': 'audio/wav' },
    body: wavBlob,
  })
  if (!res.ok) throw new Error('STT failed')
  const data = await res.json()
  return data.text
}

export async function healthCheck() {
  try {
    const res = await fetch('/api/health?url=' + encodeURIComponent('http://localhost:8081/'), { signal: AbortSignal.timeout(5000) })
    const data = await res.json()
    return data.status === 'online'
  } catch {
    return false
  }
}