module.exports = errorHandler

var cbCalled = false
  , log = require("npmlog")
  , npm = require("../npm.js")
  , rm = require("rimraf")
  , itWorked = false
  , path = require("path")
  , wroteLogFile = false
  , exitCode = 0


process.on("exit", function (code) {
  // console.error("exit", code)
  if (!npm.config.loaded) return
  if (code) itWorked = false
  if (itWorked) log.info("ok")
  else {
    if (!cbCalled) {
      log.error("", "cb() never called!")
    }

    if (wroteLogFile) {
      log.error("", [""
                ,"Additional logging details can be found in:"
                ,"    " + path.resolve("npm-debug.log")
                ].join("\n"))
      wroteLogFile = false
    }
    log.error("not ok", "code", code)
  }

  var doExit = npm.config.get("_exit")
  if (doExit) {
    // actually exit.
    if (exitCode === 0 && !itWorked) {
      exitCode = 1
    }
    if (exitCode !== 0) process.exit(exitCode)
  } else {
    itWorked = false // ready for next exit
  }
})

function exit (code, noLog) {
  exitCode = exitCode || code

  var doExit = npm.config.get("_exit")
  log.verbose("exit", [code, doExit])
  if (log.level === "silent") noLog = true

  if (code && !noLog) writeLogFile(reallyExit)
  else rm("npm-debug.log", function () { rm(npm.tmp, reallyExit) })

  function reallyExit() {
    // truncate once it's been written.
    log.record.length = 0

    itWorked = !code

    // just emit a fake exit event.
    // if we're really exiting, then let it exit on its own, so that
    // in-process stuff can finish or clean up first.
    if (!doExit) process.emit("exit", code)
  }
}


function errorHandler (er) {
  var printStack = false
  // console.error("errorHandler", er)
  if (!npm.config.loaded) {
    // logging won't work unless we pretend that it's ready
    er = er || new Error("Exit prior to config file resolving.")
    console.error(er.stack || er.message)
  }

  if (cbCalled) {
    er = er || new Error("Callback called more than once.")
  }

  cbCalled = true
  if (!er) return exit(0)
  if (typeof er === "string") {
    log.error("", er)
    return exit(1, true)
  } else if (!(er instanceof Error)) {
    log.error("weird error", er)
    return exit(1, true)
  }

  var m = er.code || er.message.match(/^(?:Error: )?(E[A-Z]+)/)
  if (m && !er.code) er.code = m

  switch (er.code) {
  case "ECONNREFUSED":
    log.error("", er)
    log.error("", ["\nIf you are behind a proxy, please make sure that the"
              ,"'proxy' config is set properly.  See: 'npm help config'"
              ].join("\n"))
    printStack = true
    break

  case "EACCES":
  case "EPERM":
    log.error("", er)
    log.error("", ["\nPlease try running this command again as root/Administrator."
              ].join("\n"))
    printStack = true
    break

  case "ELIFECYCLE":
    er.code = "ELIFECYCLE"
    log.error("", er.message)
    log.error("", ["","Failed at the "+er.pkgid+" "+er.stage+" script."
              ,"This is most likely a problem with the "+er.pkgname+" package,"
              ,"not with npm itself."
              ,"Tell the author that this fails on your system:"
              ,"    "+er.script
              ,"You can get their info via:"
              ,"    npm owner ls "+er.pkgname
              ,"There is likely additional logging output above."
              ].join("\n"))
    break

  case "ENOGIT":
    er.code = "ENOGIT"
    log.error("", er.message)
    log.error("", ["","Failed using git."
              ,"This is most likely not a problem with npm itself."
              ,"Please check if you have git installed and in your PATH."
              ].join("\n"))
    break

  case "EJSONPARSE":
    er.code = "EJSONPARSE"
    log.error("", er.message)
    log.error("", "File: "+er.file)
    log.error("", ["Failed to parse package.json data."
              ,"package.json must be actual JSON, not just JavaScript."
              ,"","This is not a bug in npm."
              ,"Tell the package author to fix their package.json file."
              ].join("\n"), "JSON.parse")
    break

  case "E404":
    er.code = "E404"
    if (er.pkgid && er.pkgid !== "-") {
      var msg = ["'"+er.pkgid+"' is not in the npm registry."
                ,"You should bug the author to publish it"]
      if (er.pkgid.match(/^node[\.\-]|[\.\-]js$/)) {
        var s = er.pkgid.replace(/^node[\.\-]|[\.\-]js$/g, "")
        if (s !== er.pkgid) {
          s = s.replace(/[^a-z0-9]/g, ' ')
          msg.push("\nMaybe try 'npm search " + s + "'")
        }
      }
      msg.push("\nNote that you can also install from a"
              ,"tarball, folder, or http url, or git url.")
      log.error("404", msg.join("\n"))
    }
    break

  case "EPUBLISHCONFLICT":
    er.code = "EPUBLISHCONFLICT"
    log.error("publish fail", ["Cannot publish over existing version."
              ,"Update the 'version' field in package.json and try again."
              ,""
              ,"If the previous version was published in error, see:"
              ,"    npm help unpublish"
              ,""
              ,"To automatically increment version numbers, see:"
              ,"    npm help version"
              ].join("\n"))
    break

  case "EISGIT":
    er.code = "EISGIT"
    log.error("git", [er.message
              ,"    "+er.path
              ,"Refusing to remove it. Update manually,"
              ,"or move it out of the way first."
              ].join("\n"))
    break

  case "ECYCLE":
    er.code = "ECYCLE"
    log.error("cycle", [er.message
              ,"While installing: "+er.pkgid
              ,"Found a pathological dependency case that npm cannot solve."
              ,"Please report this to the package author."
              ].join("\n"))
    break

  case "EBADPLATFORM":
    er.code = "EBADPLATFORM"
    log.error("notsup", [er.message
              ,"Not compatible with your operating system or architecture: "+er.pkgid
              ,"Valid OS:    "+er.os.join(",")
              ,"Valid Arch:  "+er.cpu.join(",")
              ,"Actual OS:   "+process.platform
              ,"Actual Arch: "+process.arch
              ].join("\n"))
    break

  case "EEXIST":
    log.error([er.message
              ,"File exists: "+er.path
              ,"Move it away, and try again."].join("\n"))
    break

  case "ENEEDAUTH":
    log.error("need auth", [er.message
              ,"You need to authorize this machine using `npm adduser`"
              ].join("\n"))
    break

  case "EPEERINVALID":
    var peerErrors = Object.keys(er.peersDepending).map(function (peer) {
      return "Peer " + peer + " wants " + er.packageName + "@"
        + er.peersDepending[peer]
    })
    log.error("peerinvalid", [er.message].concat(peerErrors).join("\n"))
    break

  case "ECONNRESET":
  case "ENOTFOUND":
  case "ETIMEDOUT":
    log.error("network", [er.message
              ,"This is most likely not a problem with npm itself"
              ,"and is related to network connectivity."
              ,"In most cases you are behind a proxy or have bad network settings."
              ,"\nIf you are behind a proxy, please make sure that the"
              ,"'proxy' config is set properly.  See: 'npm help config'"
              ].join("\n"))
    break

  case "ENOTSUP":
    if (er.required) {
      log.error("notsup", [er.message
                ,"Not compatible with your version of node/npm: "+er.pkgid
                ,"Required: "+JSON.stringify(er.required)
                ,"Actual:   "
                +JSON.stringify({npm:npm.version
                                ,node:npm.config.get("node-version")})
                ].join("\n"))
      break
    } // else passthrough

  default:
    log.error("", er.stack || er.message || er)
    log.error("", ["If you need help, you may report this log at:"
                  ,"    <http://github.com/isaacs/npm/issues>"
                  ,"or email it to:"
                  ,"    <npm-@googlegroups.com>"
                  ].join("\n"))
    printStack = false
    break
  }

  var os = require("os")
  // just a line break
  console.error("")
  log.error("System", os.type() + " " + os.release())
  log.error("command", process.argv
            .map(JSON.stringify).join(" "))
  log.error("cwd", process.cwd())
  log.error("node -v", process.version)
  log.error("npm -v", npm.version)

  ; [ "file"
    , "path"
    , "type"
    , "syscall"
    , "fstream_path"
    , "fstream_unc_path"
    , "fstream_type"
    , "fstream_class"
    , "fstream_finish_call"
    , "fstream_linkpath"
    , "code"
    , "errno"
    , "stack"
    , "fstream_stack"
    ].forEach(function (k) {
      var v = er[k]
      if (k === "stack") {
        if (!printStack) return
        if (!v) v = er.message
      }
      if (!v) return
      if (k === "fstream_stack") v = v.join("\n")
      log.error(k, v)
    })

  exit(typeof er.errno === "number" ? er.errno : 1)
}

var writingLogFile = false
function writeLogFile (cb) {
  if (writingLogFile) return cb()
  writingLogFile = true
  wroteLogFile = true

  var fs = require("graceful-fs")
    , fstr = fs.createWriteStream("npm-debug.log")
    , util = require("util")
    , os = require("os")
    , out = ""

  log.record.forEach(function (m) {
    var pref = [m.id, m.level]
    if (m.prefix) pref.push(m.prefix)
    pref = pref.join(' ')

    m.message.trim().split(/\r?\n/).map(function (line) {
      return (pref + ' ' + line).trim()
    }).forEach(function (line) {
      out += line + os.EOL
    })
  })

  fstr.end(out)
  fstr.on("close", cb)
}