var resolve = require("path").resolve
var fs = require("graceful-fs")
var test = require("tap").test
var mkdirp = require("mkdirp")
var rimraf = require("rimraf")

var common = require("../common-tap.js")

var pkg = resolve(__dirname, "gently-rm-linked")
var dep = resolve(__dirname, "test-linked")
var glb = resolve(__dirname, "test-global")
var lnk = resolve(__dirname, "test-global-link")

var EXEC_OPTS = {
  cwd : pkg
}

test("setup", function (t) {
  cleanup()
  setup()

  t.end()
})

test("install and link", function (t) {
  common.npm(
    [
      "--global",
      "--prefix",   lnk,
      "--loglevel", "silent",
      "install",    "../test-linked"
    ],
    EXEC_OPTS,
    function (er, code, stdout, stderr) {
      t.ifError(er, "test-linked install didn't explode")
      t.notOk(code, "test-linked install also failed")
      t.notOk(stderr, "no log output")

      verify(t, stdout)

      // again, to make sure unlinking works properlyt
      common.npm(
        [
          "--global",
          "--prefix", lnk,
          "--loglevel", "silent",
          "install", "../test-linked"
        ],
        EXEC_OPTS,
        function (er, code, stdout, stderr) {
          t.ifError(er, "test-linked install didn't explode")
          t.notOk(code, "test-linked install also failed")
          t.notOk(stderr, "no log output")

          verify(t, stdout)

          fs.readdir(pkg, function (er, files) {
            t.ifError(er, "package directory is still there")
            t.deepEqual(files, ["node_modules"], "only stub modules dir remains")

            t.end()
          })
        }
      )
    }
  )
})

test("cleanup", function (t) {
  cleanup()

  t.end()
})


var index = "module.exports = function () { console.log('whoop whoop') }"

var fixture = {
  name: "@test/linked",
  version: "1.0.0",
  bin: {
    linked: "./index.js"
  }
}

function verify (t, stdout) {
  var binPath = resolve(lnk, "bin", "linked")
  var pkgPath = resolve(lnk, "lib", "node_modules", "@test", "linked")
  var trgPath = resolve(pkgPath, "index.js")
  t.equal(
    stdout,
    binPath+" -> "+trgPath+"\n@test/linked@1.0.0 "+pkgPath+"\n",
    "got expected install output"
  )
}

function cleanup () {
  rimraf.sync(pkg)
  rimraf.sync(dep)
  rimraf.sync(lnk)
  rimraf.sync(glb)
}

function setup () {
  mkdirp.sync(pkg)
  mkdirp.sync(glb)
  fs.symlinkSync(glb, lnk)
  // so it doesn't try to install into npm's own node_modules
  mkdirp.sync(resolve(pkg, "node_modules"))
  mkdirp.sync(dep)
  fs.writeFileSync(resolve(dep, "package.json"), JSON.stringify(fixture))
  fs.writeFileSync(resolve(dep, "index.js"), index)
}