require 'dencli'
require 'yaml'

require 'pve'
require_relative 'helper'
require_relative 'cli/base'
require_relative 'cli/ct'
require_relative 'cli/ha'
require_relative 'cli/task'
require_relative 'cli/qm'
require_relative 'cli/node'
require_relative 'cli/storage'

class UsageError <RuntimeError
end

class DenCli::Sub
  def provide_help name: nil, aliases: nil, min: nil
    base = self
    name = :help  if name.nil?
    aliases = %w[-h --help]  if aliases.nil?
    min = 1  if min.nil?
    #p name: name, aliases: aliases, min: min
    cmd( name, '', aliases: aliases, min: min) {|*args| help *args }
  end
end

class PVE::Cli
  attr_reader :cfg, :cli

  def connect
    @conn ||=
      Proxmox.connect cfg[:auth][:username], cfg[:auth][:password],
        realm: cfg[:auth][:realm], **cfg[:connect]
    #RestClient.log = STDERR
    @conn
  end

  def initialize config_file = nil
    config_file ||= '/etc/pve/pvecli.yml'
    @cfg =
      YAML.safe_load File.read( config_file), [], [], false,
        config_file, symbolize_names: true
    @cli = DenCli.new File.basename($0), "PVE CLI"
    @interactive = false
    prepare
  end

  def interactive?
    @interactive
  end

  def enter host, *args
    r = host.enter *args
    STDERR.puts "! #{$?.exitstatus}"  unless r
  end

  def wait_state host, state, timeout: nil, lock: nil
    spinners = %w[- / | \\]
    spin = 0
    r =
      host.wait state, lock: lock, timeout: timeout, secs: 0.2 do |state, lock|
        lock = " (locked: #{lock})"  if lock
        STDERR.printf "\r[%s] %s Still %s%s...\e[J\n", host.name, spinners[spin = (spin + 1) % 4], state, lock
      end
    STDERR.printf "\r\e[J"
    exit 1  unless interactive?  and  r
  end

  def task_log task, logn, limit = 1024
    log = task.log start: logn, limit: limit
    log = []  if [{n: 1, t: 'no content'}] == log
    unless log.empty?
      STDERR.printf "\r\e[J"
      log.each {|l| puts l[:t] }
      logn = log.last[:n]
    end
    logn
  end

  def wait task, secs: nil, text: nil
    secs ||= 0.1
    spinners, spin, logn = "▖▘▝▗", 0, 0
    STDERR.puts task.upid
    host = task.host&.name
    loop do
      s = task.status
      logn = self.task_log task, logn
      if s.finished?
        loop do
          r = self.task_log task, logn
          break  if 0 == logn - r
          logn = r
        end
        STDERR.printf "\r[%s] %s %s %s\e[J\n",
          host || s.id,
          s.successfull? ? "\e[32;1m✓\e[0m" : "\e[31;1m✗\e[0m",
          text && "#{text}:",
          s.stopped? ? :finished : s.status
        return s
      end
      STDERR.printf "\r[%s] \e[33;1m%s\e[0m %s...\e[J",
        host || s[:id],
        spinners[spin = (spin + 1) % 4],
        text || "Working"
      sleep secs
    end
  end

  def start host, node: nil, timeout: nil, fire: nil, secs: nil
    timeout ||= 30
    if node
      task = host.migrate Proxmox::Node.find_by_name!( node)
      wait task, text: "Migrating"
    end
    if host.running?
      STDERR.puts "Already running."
      return
    end
    task = host.start
    wait task, text: "Starting"  unless fire
  end

  def stop host, timeout: nil, fire: nil, secs: nil
    timeout ||= 30
    if host.stopped?
      STDERR.puts "Already stopped."
      return
    end
    task = host.stop
    unless fire
      wait task, text: "Stopping"
    end
  end

  def create klass, template, timeout: nil, fire: nil, secs: nil, start: nil, **options
    options[:start] = fire && start
    task = klass.create template, **options
    return  if fire
    status = wait task, text: "Creating"
    if status.successfull?
      host = task.host.refresh!
      start host, timeout: timeout, secs: secs  if start
    elsif not interactive?
      exit 1
    end
  end

  def destroy ct, timeout: nil, fire: nil, secs: nil
    task = ct.destroy
    unless fire
      wait task, text: "Destroying"
    end
  end

  def help cl, *args
    STDERR.puts cl.help( *args)
    exit 1  unless interactive?
  end

  def opts_wait cl
    cl.
      opt( :timeout, "-t", "--timeout=TIMEOUT", "Wait for max TIMEOUT seconds (default: endless)", default: nil).
      opt( :secs, "-s", "--seconds=SECONDS", "Check every SECONDS for state (default: 0.2)", default: 0.2).
      opt( :fire, "-f", "--[no-]fire", "Do not wait till running", default: false)
  end

  def complete_lxc f
    Proxmox::LXC.all.
      flat_map {|x| [x.name, x.vmid.to_s] }.
      select {|x| f =~ x }
  end

  def complete_qemu f
    Proxmox::Qemu.all.
      flat_map {|x| [x.name, x.vmid.to_s] }.
      select {|x| f =~ x }
  end

  def complete_node f
    Proxmox::Qemu.all.
      map {|x| x.name }.
      select {|x| f =~ x }
  end

  def completion_helper *pre, arg, &exe
    if pre.empty?
      connect
      xs = yield /\A#{Regexp.quote arg}/
      STDOUT.print "\a"  if xs.empty?
      xs
    else
      STDOUT.print "\a"
      []
    end
  end

  def prepare
    cli_node
    cli_ct
    cli_qm
    cli_task
    cli_ha
    cli_base
    cli_storage
  end

  def call *argv
    cli.call *argv
  rescue RestClient::ExceptionWithResponse
    STDERR.puts "#$! - #{$!.response} (#{$!.class})" #, $!.backtrace.map {|b|"  #{b}"}
  rescue UsageError, DenCli::UsageError
    STDERR.puts $!
    exit 1
  end

  def appliances node, regexp, system, applications
    system = applications = true  if system.nil? and applications.nil?
    node = node ? Proxmox::Node.find_by_name!( node) : Proxmox::Node.all.first
    to = TablizedOutput.new %w<Section Package Version OS Template Description>, format: %w[> > > > > <]
    node.aplinfo.
      select {|a| 'system' == a.section ? system : applications}.
      each do |apl|
        to.push [
          apl.section,
          apl.package,
          apl.version,
          apl.os,
          apl.template,
          apl.description,
        ]
      end
    to.print order: [1,2]
  end
end