require "pathname"
require "exceptions"
require "os/mac"
require "utils/json"
require "utils/inreplace"
require "utils/popen"
require "utils/fork"
require "open-uri"

class Tty
  class << self
    def blue
      bold 34
    end

    def white
      bold 39
    end

    def red
      underline 31
    end

    def yellow
      underline 33
    end

    def reset
      escape 0
    end

    def em
      underline 39
    end

    def green
      bold 32
    end

    def gray
      bold 30
    end

    def width
      `/usr/bin/tput cols`.strip.to_i
    end

    def truncate(str)
      str.to_s[0, width - 4]
    end

    private

    def color(n)
      escape "0;#{n}"
    end

    def bold(n)
      escape "1;#{n}"
    end

    def underline(n)
      escape "4;#{n}"
    end

    def escape(n)
      "\033[#{n}m" if $stdout.tty?
    end
  end
end

def ohai(title, *sput)
  title = Tty.truncate(title) if $stdout.tty? && !ARGV.verbose?
  puts "#{Tty.blue}==>#{Tty.white} #{title}#{Tty.reset}"
  puts sput
end

def oh1(title)
  title = Tty.truncate(title) if $stdout.tty? && !ARGV.verbose?
  puts "#{Tty.green}==>#{Tty.white} #{title}#{Tty.reset}"
end

def opoo(warning)
  $stderr.puts "#{Tty.yellow}Warning#{Tty.reset}: #{warning}"
end

def onoe(error)
  $stderr.puts "#{Tty.red}Error#{Tty.reset}: #{error}"
end

def ofail(error)
  onoe error
  Homebrew.failed = true
end

def odie(error)
  onoe error
  exit 1
end

def pretty_duration(s)
  return "2 seconds" if s < 3 # avoids the plural problem ;)
  return "#{s.to_i} seconds" if s < 120
  "%.1f minutes" % (s/60)
end

def plural(n, s = "s")
  (n == 1) ? "" : s
end

def interactive_shell(f = nil)
  unless f.nil?
    ENV["HOMEBREW_DEBUG_PREFIX"] = f.prefix
    ENV["HOMEBREW_DEBUG_INSTALL"] = f.full_name
  end

  if ENV["SHELL"].include?("zsh") && ENV["HOME"].start_with?(HOMEBREW_TEMP.resolved_path.to_s)
    FileUtils.touch "#{ENV["HOME"]}/.zshrc"
  end

  Process.wait fork { exec ENV["SHELL"] }

  if $?.success?
    return
  elsif $?.exited?
    puts "Aborting due to non-zero exit status"
    exit $?.exitstatus
  else
    raise $?.inspect
  end
end

module Homebrew
  def self.system(cmd, *args)
    puts "#{cmd} #{args*" "}" if ARGV.verbose?
    pid = fork do
      yield if block_given?
      args.collect!(&:to_s)
      exec(cmd, *args) rescue nil
      exit! 1 # never gets here unless exec failed
    end
    Process.wait(pid)
    $?.success?
  end

  def self.git_head
    HOMEBREW_REPOSITORY.cd { `git rev-parse --verify -q HEAD 2>/dev/null`.chuzzle }
  end

  def self.git_short_head
    HOMEBREW_REPOSITORY.cd { `git rev-parse --short=4 --verify -q HEAD 2>/dev/null`.chuzzle }
  end

  def self.git_last_commit
    HOMEBREW_REPOSITORY.cd { `git show -s --format="%cr" HEAD 2>/dev/null`.chuzzle }
  end

  def self.git_last_commit_date
    HOMEBREW_REPOSITORY.cd { `git show -s --format="%cd" --date=short HEAD 2>/dev/null`.chuzzle }
  end

  def self.homebrew_version_string
    pretty_revision = git_short_head
    if pretty_revision
      last_commit = git_last_commit_date
      "#{HOMEBREW_VERSION} (git revision #{pretty_revision}; last commit #{last_commit})"
    else
      "#{HOMEBREW_VERSION} (no git repository)"
    end
  end

  def self.install_gem_setup_path!(gem, version = nil, executable = gem)
    require "rubygems"
    ENV["PATH"] = "#{Gem.user_dir}/bin:#{ENV["PATH"]}"

    args = [gem]
    args << "-v" << version if version

    unless quiet_system "gem", "list", "--installed", *args
      safe_system "gem", "install", "--no-ri", "--no-rdoc",
                                    "--user-install", *args
    end

    unless which executable
      odie <<-EOS.undent
        The '#{gem}' gem is installed but couldn't find '#{executable}' in the PATH:
        #{ENV["PATH"]}
      EOS
    end
  end
end

def with_system_path
  old_path = ENV["PATH"]
  ENV["PATH"] = "/usr/bin:/bin"
  yield
ensure
  ENV["PATH"] = old_path
end

def run_as_not_developer(&_block)
  old = ENV.delete "HOMEBREW_DEVELOPER"
  yield
ensure
  ENV["HOMEBREW_DEVELOPER"] = old
end

# Kernel.system but with exceptions
def safe_system(cmd, *args)
  Homebrew.system(cmd, *args) || raise(ErrorDuringExecution.new(cmd, args))
end

# prints no output
def quiet_system(cmd, *args)
  Homebrew.system(cmd, *args) do
    # Redirect output streams to `/dev/null` instead of closing as some programs
    # will fail to execute if they can't write to an open stream.
    $stdout.reopen("/dev/null")
    $stderr.reopen("/dev/null")
  end
end

def curl(*args)
  brewed_curl = HOMEBREW_PREFIX/"opt/curl/bin/curl"
  curl = if MacOS.version <= "10.6" && brewed_curl.exist?
    brewed_curl
  else
    Pathname.new "/usr/bin/curl"
  end
  raise "#{curl} is not executable" unless curl.exist? && curl.executable?

  flags = HOMEBREW_CURL_ARGS
  flags = flags.delete("#") if ARGV.verbose?

  args = [flags, HOMEBREW_USER_AGENT, *args]
  args << "--verbose" if ENV["HOMEBREW_CURL_VERBOSE"]
  args << "--silent" unless $stdout.tty?

  safe_system curl, *args
end

def puts_columns(items, star_items = [])
  return if items.empty?

  if star_items && star_items.any?
    items = items.map { |item| star_items.include?(item) ? "#{item}*" : item }
  end

  if $stdout.tty?
    # determine the best width to display for different console sizes
    console_width = `/bin/stty size`.chomp.split(" ").last.to_i
    console_width = 80 if console_width <= 0
    longest = items.sort_by(&:length).last
    optimal_col_width = (console_width.to_f / (longest.length + 2).to_f).floor
    cols = optimal_col_width > 1 ? optimal_col_width : 1

    IO.popen("/usr/bin/pr -#{cols} -t -w#{console_width}", "w") { |io| io.puts(items) }
  else
    puts items
  end
end

def which(cmd, path = ENV["PATH"])
  path.split(File::PATH_SEPARATOR).each do |p|
    begin
      pcmd = File.expand_path(cmd, p)
    rescue ArgumentError
      # File.expand_path will raise an ArgumentError if the path is malformed.
      # See https://github.com/Homebrew/homebrew/issues/32789
      next
    end
    return Pathname.new(pcmd) if File.file?(pcmd) && File.executable?(pcmd)
  end
  nil
end

def which_editor
  editor = ENV.values_at("HOMEBREW_EDITOR", "VISUAL", "EDITOR").compact.first
  return editor unless editor.nil?

  # Find Textmate
  editor = "mate" if which "mate"
  # Find BBEdit / TextWrangler
  editor ||= "edit" if which "edit"
  # Find vim
  editor ||= "vim" if which "vim"
  # Default to standard vim
  editor ||= "/usr/bin/vim"

  opoo <<-EOS.undent
    Using #{editor} because no editor was set in the environment.
    This may change in the future, so we recommend setting EDITOR, VISUAL,
    or HOMEBREW_EDITOR to your preferred text editor.
  EOS

  editor
end

def exec_editor(*args)
  safe_exec(which_editor, *args)
end

def exec_browser(*args)
  browser = ENV["HOMEBREW_BROWSER"] || ENV["BROWSER"] || OS::PATH_OPEN
  safe_exec(browser, *args)
end

def safe_exec(cmd, *args)
  # This buys us proper argument quoting and evaluation
  # of environment variables in the cmd parameter.
  exec "/bin/sh", "-c", "#{cmd} \"$@\"", "--", *args
end

# GZips the given paths, and returns the gzipped paths
def gzip(*paths)
  paths.collect do |path|
    with_system_path { safe_system "gzip", path }
    Pathname.new("#{path}.gz")
  end
end

# Returns array of architectures that the given command or library is built for.
def archs_for_command(cmd)
  cmd = which(cmd) unless Pathname.new(cmd).absolute?
  Pathname.new(cmd).archs
end

def ignore_interrupts(opt = nil)
  std_trap = trap("INT") do
    puts "One sec, just cleaning up" unless opt == :quietly
  end
  yield
ensure
  trap("INT", std_trap)
end

def nostdout
  if ARGV.verbose?
    yield
  else
    begin
      out = $stdout.dup
      $stdout.reopen("/dev/null")
      yield
    ensure
      $stdout.reopen(out)
      out.close
    end
  end
end

def paths
  @paths ||= ENV["PATH"].split(File::PATH_SEPARATOR).collect do |p|
    begin
      File.expand_path(p).chomp("/")
    rescue ArgumentError
      onoe "The following PATH component is invalid: #{p}"
    end
  end.uniq.compact
end

# return the shell profile file based on users' preference shell
def shell_profile
  case ENV["SHELL"]
  when %r{/(ba)?sh} then "~/.bash_profile"
  when %r{/zsh} then "~/.zshrc"
  when %r{/ksh} then "~/.kshrc"
  else "~/.bash_profile"
  end
end

module GitHub
  extend self
  ISSUES_URI = URI.parse("https://api.github.com/search/issues")

  Error = Class.new(RuntimeError)
  HTTPNotFoundError = Class.new(Error)

  class RateLimitExceededError < Error
    def initialize(reset, error)
      super <<-EOS.undent
        GitHub #{error}
        Try again in #{pretty_ratelimit_reset(reset)}, or create an personal access token:
          https://github.com/settings/tokens
        and then set the token as: HOMEBREW_GITHUB_API_TOKEN
                    EOS
    end

    def pretty_ratelimit_reset(reset)
      if (seconds = Time.at(reset) - Time.now) > 180
        "%d minutes %d seconds" % [seconds / 60, seconds % 60]
      else
        "#{seconds} seconds"
      end
    end
  end

  class AuthenticationFailedError < Error
    def initialize(error)
      super <<-EOS.undent
        GitHub #{error}
        HOMEBREW_GITHUB_API_TOKEN may be invalid or expired, check:
          https://github.com/settings/tokens
                    EOS
    end
  end

  def open(url, &_block)
    # This is a no-op if the user is opting out of using the GitHub API.
    return if ENV["HOMEBREW_NO_GITHUB_API"]

    require "net/https"

    headers = {
      "User-Agent" => HOMEBREW_USER_AGENT,
      "Accept"     => "application/vnd.github.v3+json"
    }

    headers["Authorization"] = "token #{HOMEBREW_GITHUB_API_TOKEN}" if HOMEBREW_GITHUB_API_TOKEN

    begin
      Kernel.open(url, headers) { |f| yield Utils::JSON.load(f.read) }
    rescue OpenURI::HTTPError => e
      handle_api_error(e)
    rescue EOFError, SocketError, OpenSSL::SSL::SSLError => e
      raise Error, "Failed to connect to: #{url}\n#{e.message}", e.backtrace
    rescue Utils::JSON::Error => e
      raise Error, "Failed to parse JSON response\n#{e.message}", e.backtrace
    end
  end

  def handle_api_error(e)
    if e.io.meta["x-ratelimit-remaining"].to_i <= 0
      reset = e.io.meta.fetch("x-ratelimit-reset").to_i
      error = Utils::JSON.load(e.io.read)["message"]
      raise RateLimitExceededError.new(reset, error)
    end

    case e.io.status.first
    when "401", "403"
      raise AuthenticationFailedError.new(e.message)
    when "404"
      raise HTTPNotFoundError, e.message, e.backtrace
    else
      raise Error, e.message, e.backtrace
    end
  end

  def issues_matching(query, qualifiers = {})
    uri = ISSUES_URI.dup
    uri.query = build_query_string(query, qualifiers)
    open(uri) { |json| json["items"] }
  end

  def repository(user, repo)
    open(URI.parse("https://api.github.com/repos/#{user}/#{repo}")) { |j| j }
  end

  def build_query_string(query, qualifiers)
    s = "q=#{uri_escape(query)}+"
    s << build_search_qualifier_string(qualifiers)
    s << "&per_page=100"
  end

  def build_search_qualifier_string(qualifiers)
    {
      :repo => "Homebrew/homebrew",
      :in => "title"
    }.update(qualifiers).map do |qualifier, value|
      "#{qualifier}:#{value}"
    end.join("+")
  end

  def uri_escape(query)
    if URI.respond_to?(:encode_www_form_component)
      URI.encode_www_form_component(query)
    else
      require "erb"
      ERB::Util.url_encode(query)
    end
  end

  def issues_for_formula(name)
    issues_matching(name, :state => "open")
  end

  def print_pull_requests_matching(query)
    return [] if ENV["HOMEBREW_NO_GITHUB_API"]
    ohai "Searching pull requests..."

    open_or_closed_prs = issues_matching(query, :type => "pr")

    open_prs = open_or_closed_prs.select { |i| i["state"] == "open" }
    if open_prs.any?
      puts "Open pull requests:"
      prs = open_prs
    elsif open_or_closed_prs.any?
      puts "Closed pull requests:"
      prs = open_or_closed_prs
    else
      return
    end

    prs.each { |i| puts "#{i["title"]} (#{i["html_url"]})" }
  end

  def private_repo?(user, repo)
    uri = URI.parse("https://api.github.com/repos/#{user}/#{repo}")
    open(uri) { |json| json["private"] }
  end
end