# Copyright (c) 2021 Harald Eilertsen
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

module MakePlugin
  class PluginInfo
    PLUGIN_FIELDS = %w{Type Use Description Comment}

    attr_reader :name
    attr_reader :n_ctrl_ports
    attr_reader :ctrl_ports
    attr_reader :use
    attr_reader :desc
    attr_reader :comment
    attr_reader :var_decls
    attr_reader :var_inits

    def initialize(root, name)
      @name = name
      @ctrl_ports = []
      @var_decls = []
      @var_inits = []
      self.find_plugin_info(root)
      if @n_ctrl_ports != @ctrl_ports.length
        raise "Expected #{@n_ctrl_ports} but found #{@ctrl_ports.length}"
      end
    end

    def type
      case @type&.downcase
      when 'bitcrusher'
        'DistortionPlugin'
      when 'clipper'
        'DistortionPlugin'
      when 'compressor'
        'CompressorPlugin'
      when 'distortion'
        'DistortionPlugin'
      when 'gain'
        'AplifierPlugin'
      when 'limiter'
        'LimiterPlugin'
      when 'modulation'
        'ModulationPlugin'
      when 'saturation'
        'DistortionPlugin'
      when 'utility'
        'UtilityPlugin'
      when 'eq'
        'EQPlugin'
      else
        'EffectsPlugin'
      end
    end

    def raw_type
      @type
    end

    def slug
      @name.downcase
    end

    private

    def find_plugin_info(root)
      found = false

      db = File.join(root, '../../cheatsheet/src/database.js')
      File.open(db) do |f|
        pat = /^\s*(\w+): \"([^"]+)\",/
        f.each_line do |line|
          break if found && line =~ /^\s*\},$/

          pat.match(line) do |m|
            if m[1] == 'Name' && m[2] == @name
              found = true
            elsif found && PLUGIN_FIELDS.include?(m[1])
              eval(%Q{@#{m[1].downcase.to_sym} = "#{m[2]}"})
            end
          end
        end
      end

      header_file = File.join(root, '../WinVST', @name, "#{@name}.h")

      File.open(header_file) do |f|
        vars = false
        f.each_line do |line|
          if vars
            if line =~ /^\s*\};$/
              vars = false
            else
              @var_decls << line.chomp
            end
          elsif line =~ /kNumParameters\s*=\s*(\d+)/
            @n_ctrl_ports = $1.to_i
          elsif line =~ /std::set<[^>]+>\s*_canDo;/
            vars = true
          end
        end
      end

      class_file = File.join(root, '../WinVST', @name, "#{@name}.cpp")
      fun = ""

      File.open(class_file) do |f|
        f.each_line do |line|
          if line =~ /void #{@name}::(\w+)/
            fun = $1
          elsif line =~ /^#{@name}::#{@name}/
            fun = 'constructor_'
          elsif fun == 'getParameterName' and line =~ /case\s+kParam([A-Z])\:\s+vst_strncpy\s*\([^,]*,\s*\"([^"]+)\",/
            @ctrl_ports << { sym: $1, name: $2 }
          elsif fun == 'constructor_' and line =~ /\{\s*$/
            fun = 'constructor'
          elsif fun == 'constructor'
            if line =~ /^\s+_canDo\./
              fun = ''
            else
              @var_inits << line.chomp
            end
          end
        end
      end
    end
  end
end