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#!/usr/bin/env ruby
# Copyright (C) 2013-2016 all contributors <dtas-all@nongnu.org>
# License: GPL-3.0+ (https://www.gnu.org/licenses/gpl-3.0.txt)
# frozen_string_literal: true
# encoding: binary
# WARNING: totally unstable API, use dtas-ctl for scripting (but the protocol
# itself is also unstable, but better than this one probably).
require 'dtas/unix_client'
require 'shellwords'

def get_track_ids(c)
  track_ids = c.req("tl tracks")
  # we could get more, but SEQPACKET limits size...
  track_ids = track_ids.split(' ')
  track_ids.shift
  track_ids
end

def fix_enc!(str, enc)
  str.force_encoding(enc)
  str.force_encoding(Encoding::ASCII_8BIT) unless str.valid_encoding?
end

def do_edit(c)
  require 'dtas/edit_client'
  require 'yaml'
  require 'tempfile'
  extend DTAS::EditClient
  tmp = Tempfile.new(%w(dtas-tl-edit .txt))
  tmp.binmode
  tmp_path = tmp.path
  orig = []
  orig_idx = {}
  enc = Encoding.default_external

  get_track_ids(c).each_slice(128) do |track_ids|
    res = c.req("tl get #{track_ids.join(' ')}")
    res = Shellwords.split(res.sub!(/\A\d+ /, ''))
    while line = res.shift
      line.sub!(/\A(\d+)=/n, '') or abort "unexpected line=#{line.inspect}\n"
      fix_enc!(line, enc)
      track_id = $1.to_i
      orig_idx[track_id] = orig.size
      orig << track_id
      tmp.write("#{Shellwords.escape(line)} =#{track_id}\n")
    end
  end
  tmp.flush

  ed = editor
  # jump to the line of the currently playing track if using vi or vim
  # Patches for other editors welcome: dtas-all@nongnu.org
  if ed =~ /vim?\z/
    cur = YAML.load(c.req('current'))
    if tl = cur['tracklist']
      if pos = tl['pos']
        ed += " +#{pos + 1}"
      end
    end
  end
  # Run the editor and let the user edit!
  system("#{ed} #{Shellwords.escape tmp_path}") or return

  edit = []
  edit_idx = {}
  add = []
  # editor may rename/link a new file into place
  File.open(tmp_path) do |fp|
    fp.binmode
    while line = fp.gets
      line.chomp!
      if line.sub!(/ =(\d+)\z/n, '') # existing tracks
        track_id = $1.to_i
        if edit_idx[track_id] # somebody copy+pasted an existing line
          add << [ line, edit.last ]
        else # moved line
          edit_idx[track_id] = edit.size
          edit << track_id
        end
      else # entirely new line
        add << [ line, edit.last ]
      end
    end
  end
  edit.each_with_index do |track_id, i|
    oi = orig_idx[track_id] or warn("unknown track_id=#{track_id}") or next
    next if oi == i # no change, yay!
    prev_track_id = orig[i] or warn("unknown index at #{i}") or next
    c.req("tl swap #{track_id} #{prev_track_id}")
    orig_idx[track_id] = i
    orig_idx[prev_track_id] = oi
    orig[i] = track_id
    orig[oi] = prev_track_id
  end
  orig.each do |track_id|
    edit_idx[track_id] or c.req("tl remove #{track_id}")
  end

  prev_added_id = last_after_id = nil
  non_existent = []
  add.each do |path, after_id|
    orig = path
    path = Shellwords.split(path)[0]
    path = File.expand_path(path)
    unless File.exist?(path)
      path = orig.dup
      fix_enc!(path, enc)
      path = Shellwords.split(path)[0]
      path = File.expand_path(path)
    end

    if File.exist?(path)
      cmd = %W(tl add #{path})
      id = after_id == last_after_id ? prev_added_id : after_id
      cmd << id.to_s if id
      prev_added_id = c.req(cmd).to_i
      last_after_id = after_id
    else
      non_existent << orig
    end
  end
  if non_existent[0]
    $stderr.puts "Failed to add #{non_existent.size} paths"
    non_existent.each { |path| $stderr.puts path }
  end
ensure
  tmp.close! if tmp
end

def add_after(c, argv, last_id)
  argv.each do |path|
    path = File.expand_path(path)
    req = %W(tl add #{path})
    req << last_id.to_s if last_id
    res = c.req(req)
    print "#{path} #{res}\n"
    last_id = res if res =~ /\A\d+\z/
  end
end

c = DTAS::UNIXClient.new
case cmd = ARGV[0]
when "cat"
  enc = Encoding.default_external
  get_track_ids(c).each do |track_id|
    res = c.req("tl get #{track_id}")
    res.sub!(/\A1 /n, '')
    fix_enc!(res, enc)
    print "#{res}\n"
  end
when 'aac' # add-after-current
  ARGV.shift
  rv = c.req(%w(tl current-id))
  last_id = rv =~ %r{\A\d+\z} ? rv.to_i : nil
  add_after(c, ARGV, last_id)
when "addhead"
  ARGV.shift
  ARGV.reverse_each do |path|
    path = File.expand_path(path)
    res = c.req(%W(tl add #{path}))
    print "#{path} #{res}\n"
  end
when "addtail"
  ARGV.shift
  track_ids = get_track_ids(c)
  last_id = track_ids.pop
  add_after(c, ARGV, last_id)
when "reto"
  fixed = ARGV.delete("-F")
  ignorecase = ARGV.delete("-i")
  re = ARGV[1]
  time = ARGV[2]
  re = Regexp.quote(re) if fixed
  re = ignorecase ? %r{#{re}}i : %r{#{re}}
  get_track_ids(c).each do |track_id|
    res = c.req("tl get #{track_id}")
    res.sub!(/\A1 \d+=/, '')
    if re =~ res
      req = %W(tl goto #{track_id})
      req << time if time
      res = c.req(req)
      puts res
      exit(res == "OK")
    end
  end
  warn "#{re.inspect} not found"
  exit 1
when 'edit' then do_edit(c)
else
  # act like dtas-ctl for now...
  puts c.req([ "tl", *ARGV ])
end