/**
 * Node-compatible http for Bare — adds Unix socket support.
 *
 * bare-http1's Agent always uses bare-tcp and ignores `socketPath`.
 * dockerode/docker-modem requires:
 *   http.request({ socketPath: '/var/run/docker.sock', path: '/version', ... })
 *
 * Without this, requests go to TCP localhost:80 → reverse-proxy 301 to HTTPS.
 *
 * Important: only `socketPath` selects a Unix socket. HTTP option `path` is the
 * request URL path (/v2/…, /containers/…), not a filesystem socket. Using `path`
 * as a socket breaks bare-https (HTTPSAgent extends this Agent) with ENOENT.
 *
 * Unix/IPC sockets (bare-pipe) do not implement TCP keep-alive; bare-http1's
 * global Agent calls socket.setKeepAlive on free and crashes with:
 *   TypeError: this._socket.setKeepAlive is not a function
 */
'use strict'

const http = require('bare-http1')
const net = require('bare-net')

/**
 * bare-net Socket.setKeepAlive delegates to the underlying handle.
 * bare-pipe has no setKeepAlive — wrap so Agent keep-alive is a no-op.
 */
function hardenSocket(socket) {
  if (!socket || socket.__peardockHardened) return socket

  const wrap = (name) => {
    const orig = typeof socket[name] === 'function' ? socket[name].bind(socket) : null
    socket[name] = function (...args) {
      if (!orig) return this
      try {
        return orig(...args)
      } catch {
        return this
      }
    }
  }

  wrap('setKeepAlive')
  wrap('setNoDelay')
  wrap('setTimeout')
  wrap('ref')
  wrap('unref')

  // Ensure methods always exist even if missing on the object
  if (typeof socket.setKeepAlive !== 'function') {
    socket.setKeepAlive = function () {
      return this
    }
  }
  if (typeof socket.setNoDelay !== 'function') {
    socket.setNoDelay = function () {
      return this
    }
  }
  if (typeof socket.unref !== 'function') {
    socket.unref = function () {
      return this
    }
  }
  if (typeof socket.ref !== 'function') {
    socket.ref = function () {
      return this
    }
  }

  socket.__peardockHardened = true
  return socket
}

function patchAgent(Agent) {
  if (!Agent || Agent.prototype.__peardockSocketPathPatched) return Agent

  const origCreate = Agent.prototype.createConnection
  const origGetName = Agent.prototype.getName
  const origKeepAlive = Agent.prototype.keepSocketAlive

  Agent.prototype.createConnection = function createConnection(opts, callback) {
    const o = opts || {}
    // ONLY socketPath means "connect via Unix socket". Never treat `path` as a
    // socket — in HTTP request options, `path` is the URL path (e.g. /v2/…/manifests/tag).
    // bare-https's HTTPSAgent extends this Agent and calls super.createConnection(opts);
    // mistaking URL path for a socket yields ENOENT "no such file or directory" on
    // every registry HTTPS call (image update checks, etc.).
    // dockerode always sets socketPath explicitly for the Docker Engine socket.
    const sock = typeof o.socketPath === 'string' && o.socketPath ? o.socketPath : null

    if (sock) {
      const socket = hardenSocket(net.createConnection({ path: sock }))
      if (typeof callback === 'function') {
        socket.once('connect', () => callback(null, socket))
      }
      return socket
    }

    let socket
    if (typeof origCreate === 'function') {
      socket = origCreate.call(this, o, callback)
    } else {
      socket = net.createConnection(o, callback)
    }
    return hardenSocket(socket)
  }

  Agent.prototype.getName = function getName(opts) {
    const o = opts || {}
    if (o.socketPath) return `unix:${o.socketPath}:`
    if (typeof origGetName === 'function') return origGetName.call(this, o)
    return `${o.host || 'localhost'}:${o.port || 80}`
  }

  Agent.prototype.keepSocketAlive = function keepSocketAlive(socket) {
    // Prefer original implementation when safe
    try {
      if (typeof origKeepAlive === 'function') {
        return origKeepAlive.call(this, socket)
      }
    } catch {
      // fall through
    }
    // Unix sockets / bare-pipe: no TCP keep-alive; still unref for pooling
    try {
      if (typeof socket?.setKeepAlive === 'function') {
        socket.setKeepAlive(true, this._keepAlive > 0 ? this._keepAlive : 1000)
      }
    } catch {
      // ignore
    }
    try {
      if (typeof socket?.unref === 'function') socket.unref()
    } catch {
      // ignore
    }
    // Return true so free sockets can be reused (docker.sock benefits from pooling)
    return this._keepAlive !== -1
  }

  Agent.prototype.__peardockSocketPathPatched = true
  return Agent
}

patchAgent(http.Agent)
if (http.globalAgent?.constructor) {
  patchAgent(http.globalAgent.constructor)
}

module.exports = http
module.exports.default = http