#!/usr/bin/env ruby

require 'yaml'
require 'erb'

# load template data
DATA = YAML.load_file(File.join(__dir__, 'ops.yaml'))

switches = DATA['ops'].reduce([]) do |r, set|
  prefix = (set.first == 'cb') ? 0xCB00 : 0x0000

  set.last.reduce(r) do |r, op|
    # op hex string
    hex = (prefix + op['hex']).to_s(16).upcase.rjust(4, '0')

    r << case op['op']
    when 'XX'
      [
        "case 0x%s: /* op: %s, cat: %s */",
        "  invalid(ctx, old_pc);",
        "  break;",
      ].join("\n") % [
        hex,
        op['id'],
        op['cat'],
      ]
    else
      # time expr
      time_expr = case op['time']
      when Numeric
        'ctx->cpu.clock += %d;' % [op['time']]
      when Hash
        'ctx->cpu.clock += %d; // t: %d, f: %d' % %w{f t f}.map { |k| 
          op['time'][k]
        }
      else
        raise "unknown op time: #{hex}: #{op['time']}"
      end

      [
        "case 0x%s: /* op: \"%s\", cat: \"%s\" */",
        "  %s", # action_expr
        "  %s", # time_expr
        "  break;"
      ].join("\n") % [
        hex,
        op['id'],
        op['cat'],
        op['code'] || 'not_implemented(ctx, old_pc, op);',
        time_expr,
      ]
    end
  end
end.join("\n")

t = ERB.new(DATA['templates']['main'])
puts t.run(binding)