fs = require 'fs'
path = require 'path'
_ = require 'underscore'

module.exports = (grunt) ->
  {cp, isNylasPackage, mkdir, rm} = require('./task-helpers')(grunt)

  escapeRegExp = (string) ->
    if string
      return string.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&')
    else
      return ''

  grunt.registerTask 'copy-files-for-build', 'Copy files for build', ->
    shellAppDir = grunt.config.get('nylasGruntConfig.shellAppDir')
    buildDir = grunt.config.get('nylasGruntConfig.buildDir')
    appDir = grunt.config.get('nylasGruntConfig.appDir')

    rm shellAppDir
    rm path.join(buildDir, 'installer')
    mkdir path.dirname(buildDir)

    if process.platform is 'darwin'
      cp 'electron/Electron.app', shellAppDir, filter: /default_app/
      cp(path.join(shellAppDir, 'Contents', 'MacOS', 'Electron'),
         path.join(shellAppDir, 'Contents', 'MacOS', 'Nylas'))
      rm path.join(shellAppDir, 'Contents', 'MacOS', 'Electron')

      # Create locale directories that were skipped because they were empty.
      # Otherwise, `navigator.language` always returns `English`.
      resourcesDir = 'electron/Electron.app/Contents/Resources'
      filenames = fs.readdirSync(resourcesDir)
      for filename in filenames
        continue unless fs.statSync(path.join(resourcesDir, filename)).isDirectory()
        continue unless path.extname(filename) is '.lproj'
        destination = path.join(shellAppDir, 'Contents', 'Resources', filename)
        continue if fs.existsSync(destination)
        grunt.file.mkdir(destination)

    else if process.platform is 'win32'
      cp 'electron', shellAppDir, filter: /default_app/
      cp path.join(shellAppDir, 'electron.exe'), path.join(shellAppDir, 'nylas.exe')
      rm path.join(shellAppDir, 'electron.exe')
    else
      cp 'electron', shellAppDir, filter: /default_app/
      cp path.join(shellAppDir, 'electron'), path.join(shellAppDir, 'nylas')
      rm path.join(shellAppDir, 'electron')

    mkdir appDir

    if process.platform isnt 'win32'
      cp 'N1.sh', path.resolve(appDir, '..', 'new-app', 'N1.sh')

    cp 'package.json', path.join(appDir, 'package.json')
    cp path.join('build', 'resources', 'nylas.png'), path.join(appDir, 'nylas.png')

    packageNames = []
    packageDirectories = []
    nonPackageDirectories = [
      'dot-nylas'
    ]

    {devDependencies} = grunt.file.readJSON('package.json')
    for packageFolder in ['node_modules', 'internal_packages']
      for child in fs.readdirSync(packageFolder)
        directory = path.join(packageFolder, child)
        if isNylasPackage(directory)
          packageDirectories.push(directory)
          packageNames.push(child)
        else
          nonPackageDirectories.push(directory)

    # Put any paths here that shouldn't end up in the built Electron.app
    # so that it doesn't becomes larger than it needs to be.
    ignoredPaths = [
      path.join('less', 'dist')
      path.join('npm', 'doc')
      path.join('npm', 'html')
      path.join('npm', 'man')
      path.join('npm', 'node_modules', '.bin', 'beep')
      path.join('npm', 'node_modules', '.bin', 'clear')
      path.join('npm', 'node_modules', '.bin', 'starwars')
      path.join('pegjs', 'examples')
      path.join('jasmine-reporters', 'ext')
      path.join('jasmine-node', 'node_modules', 'gaze')
      path.join('jasmine-node', 'spec')
      path.join('node_modules', 'nan')
      path.join('build', 'binding.Makefile')
      path.join('build', 'config.gypi')
      path.join('build', 'gyp-mac-tool')
      path.join('build', 'Makefile')
      path.join('build', 'Release', 'obj.target')
      path.join('build', 'Release', 'obj')
      path.join('build', 'Release', '.deps')
      path.join('build', 'resources')
      path.join('build', 'resources', 'linux')
      path.join('build', 'resources', 'mac')
      path.join('build', 'resources', 'win')
      path.join('vendor', 'apm')

      # These are only require in dev mode when the grammar isn't precompiled
      path.join('snippets', 'node_modules', 'loophole')
      path.join('snippets', 'node_modules', 'pegjs')
      path.join('snippets', 'node_modules', '.bin', 'pegjs')

      # These aren't needed since WeakMap is built-in
      path.join('emissary', 'node_modules', 'es6-weak-map')
      path.join('property-accessors', 'node_modules', 'es6-weak-map')

      '.DS_Store'
      '.jshintrc'
      '.npmignore'
      '.pairs'
      '.travis.yml'
      'appveyor.yml'
      '.idea'
      '.editorconfig'
      '.lint'
      '.lintignore'
      '.eslintrc'
      '.jshintignore'
      '.gitattributes'
      '.gitkeep'
    ]

    ignoredPaths = ignoredPaths.map (ignoredPath) -> escapeRegExp(ignoredPath)

    # Add .* to avoid matching hunspell_dictionaries.
    ignoredPaths.push "#{escapeRegExp(path.join('spellchecker', 'vendor', 'hunspell') + path.sep)}.*"
    ignoredPaths.push "#{escapeRegExp(path.join('build', 'Release') + path.sep)}.*\\.pdb"

    # Ignore *.cc and *.h files from native modules
    ignoredPaths.push "#{escapeRegExp(path.join('ctags', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{escapeRegExp(path.join('keytar', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{escapeRegExp(path.join('nslog', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{escapeRegExp(path.join('pathwatcher', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{escapeRegExp(path.join('runas', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{escapeRegExp(path.join('scrollbar-style', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{escapeRegExp(path.join('spellchecker', 'src') + path.sep)}.*\\.(cc|h)*"

    # Ignore build files
    ignoredPaths.push "#{escapeRegExp(path.sep)}binding\\.gyp$"
    ignoredPaths.push "#{escapeRegExp(path.sep)}.+\\.target.mk$"
    ignoredPaths.push "#{escapeRegExp(path.sep)}linker\\.lock$"
    ignoredPaths.push "#{escapeRegExp(path.join('build', 'Release') + path.sep)}.+\\.node\\.dSYM"

    # Hunspell dictionaries are only not needed on OS X.
    if process.platform is 'darwin'
      ignoredPaths.push path.join('spellchecker', 'vendor', 'hunspell_dictionaries')
    ignoredPaths = ignoredPaths.map (ignoredPath) -> "(#{ignoredPath})"

    testFolderPattern = new RegExp("#{escapeRegExp(path.sep)}te?sts?#{escapeRegExp(path.sep)}")
    exampleFolderPattern = new RegExp("#{escapeRegExp(path.sep)}examples?#{escapeRegExp(path.sep)}")

    nodeModulesFilter = new RegExp(ignoredPaths.join('|'))
    filterNodeModule = (pathToCopy) ->
      pathToCopy = path.resolve(pathToCopy)
      nodeModulesFilter.test(pathToCopy) or testFolderPattern.test(pathToCopy) or exampleFolderPattern.test(pathToCopy)

    packageFilter = new RegExp("(#{ignoredPaths.join('|')})|(.+\\.(cson|coffee|cjsx|jsx)$)")
    filterPackage = (pathToCopy) ->
      pathToCopy = path.resolve(pathToCopy)
      packageFilter.test(pathToCopy) or testFolderPattern.test(pathToCopy) or exampleFolderPattern.test(pathToCopy)

    for directory in nonPackageDirectories
      cp directory, path.join(appDir, directory), filter: filterNodeModule

    for directory in packageDirectories
      cp directory, path.join(appDir, directory), filter: filterPackage

    cp 'spec', path.join(appDir, 'spec')
    cp 'src', path.join(appDir, 'src'), filter: /.+\.(cson|coffee|cjsx|jsx)$/
    cp 'static', path.join(appDir, 'static')

    # Move all of the node modules inside /apm/node_modules to new-app/apm/node_modules
    apmInstallDir = path.resolve(appDir, '..', 'new-app', 'apm')
    mkdir apmInstallDir
    cp path.join('apm', 'node_modules'), path.resolve(apmInstallDir, 'node_modules'), filter: filterNodeModule

    # Move /apm/node_modules/atom-package-manager to new-app/apm. We're essentially
    # pulling the atom-package-manager module up outside of the node_modules folder,
    # which is necessary because npmV3 installs nested dependencies in the same dir.
    apmPackageDir = path.join(apmInstallDir, 'node_modules', 'atom-package-manager')
    for name in fs.readdirSync(apmPackageDir)
      fs.renameSync path.join(apmPackageDir, name), path.join(apmInstallDir, name)
    fs.unlinkSync(path.join(apmInstallDir, 'node_modules', '.bin', 'apm'))
    fs.rmdirSync(apmPackageDir)

    if process.platform is 'darwin'
      grunt.file.recurse path.join('build', 'resources', 'mac'), (sourcePath, rootDirectory, subDirectory='', filename) ->
        unless /.+\.plist/.test(sourcePath)
          grunt.file.copy(sourcePath, path.resolve(appDir, '..', subDirectory, filename))

    if process.platform is 'win32'
      cp path.join('build', 'resources', 'win', 'N1.cmd'), path.join(shellAppDir, 'resources', 'cli', 'N1.cmd')
      cp path.join('build', 'resources', 'win', 'N1.sh'), path.join(shellAppDir, 'resources', 'cli', 'N1.sh')
      cp path.join('build', 'resources', 'win', 'nylas-win-bootup.js'), path.join(shellAppDir, 'resources', 'cli', 'nylas-win-bootup.js')
      cp path.join('build', 'resources', 'win', 'apm.sh'), path.join(shellAppDir, 'resources', 'cli', 'apm.sh')

    if process.platform is 'linux'
      cp path.join('build', 'resources', 'linux', 'icons'), path.join(buildDir, 'icons')