#!/usr/bin/env ruby
require_relative 'lib/makeplugin/plugin_info'

def param_sym(n)
    ('A'.ord + n).chr
end

def make_param_assigns(num)
  (0 ... num)
    .map { |n| "#{param_sym(n)} = *param[#{n}];" }
    .join("\n    ")
end

def make_ctrl_port(n, name)
  %Q{      a lv2:InputPort , lv2:ControlPort ;
      lv2:index #{n} ;
      lv2:symbol "#{param_sym(n)}" ;
      lv2:name "#{name}" ;
      lv2:default 0.5 ;
      lv2:minimum 0.0 ;
      lv2:maximum 1.0 ;}
end

def make_lv2_port_defs(pi)
  num = pi.n_ctrl_ports
  ctrlports = (0 ... num)
    .map { |n| make_ctrl_port(n, pi.ctrl_ports[n]) }
    .join("\n    ] , [\n")

  ctrlports + %Q{
    ] , [
      a lv2:InputPort , lv2:AudioPort ;
      lv2:index #{num} ;
      lv2:symbol "in_l" ;
      lv2:name "In left" ;
    ] , [
      a lv2:InputPort , lv2:AudioPort ;
      lv2:index #{num + 1} ;
      lv2:symbol "in_r" ;
      lv2:name "In right" ;
    ] , [
      a lv2:OutputPort , lv2:AudioPort ;
      lv2:index #{num + 2} ;
      lv2:symbol "out_l" ;
      lv2:name "Out left" ;
    ] , [
      a lv2:OutputPort , lv2:AudioPort ;
      lv2:index #{num + 3} ;
      lv2:symbol "out_r" ;
      lv2:name "Out right" ;}
end

if ARGV.length < 1
  puts "Usage: #{__FILE__} <PluginName>"
  exit
end

root = File.dirname(__FILE__)

plugin_name = ARGV[0]
plugin_slug = plugin_name.downcase

target_dir = File.join(root, 'src', plugin_name)
template_dir = File.join(root, 'Template')

def get_lv2_plugin_type(plugin_info)
  case plugin_info.type
    when 'Saturation'
      'DistortionPlugin'
    when 'EQ'
      'EQPlugin'
    else
      'EffectsPlugin'
  end
end

puts "Reading plugin info from cheatsheet..."
pi = MakePlugin::PluginInfo.new(root, plugin_name)


puts "Creating plugin #{pi.name}..."
puts "Type: #{pi.type}"
puts "CTRL ports: #{pi.ctrl_ports.length}"

Templates = %w{
    manifest.ttl.in
    Plugin.ttl
    Plugin.h
    Plugin.cpp
}

begin
  Dir.mkdir(target_dir)

  Templates.each do |t|
    tpl = IO.read(File.join(template_dir, t))
      .gsub('@Plugin@', pi.name)
      .gsub('@plugin@', plugin_slug)
      .gsub('@NCtrlPorts@', pi.n_ctrl_ports.to_s)
      .gsub('@AssignParams@', make_param_assigns(pi.n_ctrl_ports))
      .gsub('@TTLPortDefs@', make_lv2_port_defs(pi))
      .gsub('@TTLPluginType@', get_lv2_plugin_type(pi))

    fname = t.sub('Plugin', pi.name)

    puts " - #{fname}..."
    File.open(File.join(target_dir, fname), "w") do |f|
      f.write(tpl)
    end
  end

rescue SystemCallError => e
  puts "Could not create plugin: #{e}"
  puts "Aborting!"
end