const TOKEN_KEY = 'hexi_web_token'
const USER_KEY = 'hexi_web_username'

export function getToken() { return localStorage.getItem(TOKEN_KEY) || '' }

interface ReqOpts { method?: string; body?: any; headers?: Record<string,string> }

async function request(url: string, opts: ReqOpts = {}) {
  const headers: Record<string,string> = { 'Content-Type': 'application/json', ...(opts.headers || {}) }
  const token = getToken()
  if (token) headers['Authorization'] = 'Bearer ' + token
  const res = await fetch(url, { method: opts.method || 'GET', headers, body: opts.body !== undefined ? JSON.stringify(opts.body) : undefined })
  let data: any = null
  try { data = await res.json() } catch { data = null }
  if (!res.ok) {
    const msg = (data && (data.detail || data.msg)) || ('HTTP ' + res.status)
    throw new Error(msg)
  }
  return data
}

export function setSession(token: string, username: string) {
  localStorage.setItem(TOKEN_KEY, token)
  localStorage.setItem(USER_KEY, username)
}
export function clearSession() {
  localStorage.removeItem(TOKEN_KEY)
  localStorage.removeItem(USER_KEY)
}
export function getUserName() { return localStorage.getItem(USER_KEY) || '' }

export const authLogin = async (username: string, password: string) => {
  const res = await fetch('/hub/api/auth/token', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: new URLSearchParams({ username, password }).toString(),
  })
  const data = await res.json().catch(() => null)
  if (!res.ok) throw new Error((data && (data.detail || data.msg)) || ('HTTP ' + res.status))
  if (data && data.access_token === undefined) throw new Error('登录失败')
  return { token: data.access_token, username: data.username || username }
}
export const authMe = async () => await request('/hub/api/auth/me')
export const hubPlugins = async () => await request('/hub/api/plugins')
export const hubDashboard = async () => await request('/hub/api/dashboard')
export const hubPluginCatalog = async () => await request('/hub/api/plugins/catalog')
export const hubGroups = async () => await request('/hub/api/groups')
export const hubPluginSetGlobal = async (id: string, body: any) =>
  await request('/hub/api/plugins/' + encodeURIComponent(id) + '/global', { method: 'POST', body })
export const hubPluginSetGroup = async (id: string, gid: string, body: any) =>
  await request('/hub/api/plugins/' + encodeURIComponent(id) + '/groups/' + encodeURIComponent(gid), { method: 'POST', body })
export const hubPluginRemoveGroup = async (id: string, gid: string) =>
  await request('/hub/api/plugins/' + encodeURIComponent(id) + '/groups/' + encodeURIComponent(gid), { method: 'DELETE' })
export const hubPluginGetConfig = async (id: string) =>
  await request('/hub/api/plugins/' + encodeURIComponent(id) + '/config')
export const hubPluginSaveConfig = async (id: string, values: Record<string, any>, revision: number) =>
  await request('/hub/api/plugins/' + encodeURIComponent(id) + '/config', { method: 'POST', body: { values, revision } })
export const hubSettings = async () => await request('/hub/api/settings')
export const hubChangePassword = async (old_password: string, new_password: string) =>
  await request('/hub/api/settings/password', { method: 'POST', body: { old_password, new_password } })
export const hubLogs = async (limit = 500) => await request('/hub/api/logs?limit=' + limit)
export const hubBotAction = async (action: 'stop' | 'restart') =>
  await request('/hub/api/system/bot', { method: 'POST', body: { action } })
export const hubBotConfig = async () => await request('/hub/api/system/bot_config')
export const hubBotConfigSave = async (values: Record<string, any>) =>
  await request('/hub/api/system/bot_config', { method: 'POST', body: values })

export function hubLogStream(opts: {
  since: number
  onLine: (line: string) => void
  onStatus: (s: 'open' | 'reconnecting' | 'closed') => void
}): () => void {
  const controller = new AbortController()
  let stopped = false
  let since = opts.since

  const read = async () => {
    while (!stopped) {
      try {
        const res = await fetch('/hub/api/logs/stream?since=' + since, {
          headers: { Authorization: 'Bearer ' + getToken() },
          signal: controller.signal,
        })
        if (!res.ok || !res.body) throw new Error('HTTP ' + res.status)
        opts.onStatus('open')
        const reader = res.body.getReader()
        const decoder = new TextDecoder()
        let buf = ''
        while (!stopped) {
          const { done, value } = await reader.read()
          if (done) break
          buf += decoder.decode(value, { stream: true })
          let i
          while ((i = buf.indexOf('\n\n')) !== -1) {
            const block = buf.slice(0, i)
            buf = buf.slice(i + 2)
            for (const ln of block.split('\n')) {
              if (ln.startsWith('data: ')) {
                try {
                  const obj = JSON.parse(ln.slice(6))
                  if (obj && obj.line !== undefined) {
                    opts.onLine(obj.line)
                    if (typeof obj.offset === 'number') since = obj.offset
                  }
                } catch { /* 忽略坏帧 */ }
              }
            }
          }
        }
        if (!stopped) opts.onStatus('reconnecting')
      } catch (e: any) {
        if (stopped || (e && e.name === 'AbortError')) return
        opts.onStatus('reconnecting')
      }
      if (!stopped) await new Promise(res => setTimeout(res, 1500))
    }
  }

  read()
  return () => { stopped = true; controller.abort() }
}

export function hubDashboardStream(opts: {
  onData: (data: any) => void
  onStatus?: (s: 'open' | 'reconnecting' | 'closed') => void
}): () => void {
  const controller = new AbortController()
  let stopped = false

  const read = async () => {
    while (!stopped) {
      try {
        const res = await fetch('/hub/api/dashboard/stream', {
          headers: { Authorization: 'Bearer ' + getToken() },
          signal: controller.signal,
        })
        if (!res.ok || !res.body) throw new Error('HTTP ' + res.status)
        opts.onStatus?.('open')
        const reader = res.body.getReader()
        const decoder = new TextDecoder()
        let buf = ''
        while (!stopped) {
          const { done, value } = await reader.read()
          if (done) break
          buf += decoder.decode(value, { stream: true })
          let i
          while ((i = buf.indexOf('\n\n')) !== -1) {
            const block = buf.slice(0, i)
            buf = buf.slice(i + 2)
            for (const ln of block.split('\n')) {
              if (ln.startsWith('data: ')) {
                try { opts.onData(JSON.parse(ln.slice(6))) } catch { /* 忽略坏帧 */ }
              }
            }
          }
        }
        if (!stopped) opts.onStatus?.('reconnecting')
      } catch (e: any) {
        if (stopped || (e && e.name === 'AbortError')) return
        opts.onStatus?.('reconnecting')
      }
      if (!stopped) await new Promise(res => setTimeout(res, 2000))
    }
  }

  read()
  return () => { stopped = true; controller.abort() }
}

export const api = (plugin: string) => ({
  get: (path: string) => request(`/api/${plugin}/${path}`),
  post: (path: string, body: any) => request(`/api/${plugin}/${path}`, { method: 'POST', body }),
  put: (path: string, body: any) => request(`/api/${plugin}/${path}`, { method: 'PUT', body }),
  del: (path: string) => request(`/api/${plugin}/${path}`, { method: 'DELETE' }),
})