# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
# https://developers.google.com/protocol-buffers/
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# require mixins before we hook them into the java & c code
require 'google/protobuf/message_exts'

# We define these before requiring the platform-specific modules.
# That way the module init can grab references to these.
module Google
  module Protobuf
    class Error < StandardError; end
    class ParseError < Error; end
    class TypeError < ::TypeError; end
  end
end

if RUBY_PLATFORM == "java"
  require 'json'
  require 'google/protobuf_java'
else
  begin
    require "google/#{RUBY_VERSION.sub(/\.\d+$/, '')}/protobuf_c"
  rescue LoadError
    require 'google/protobuf_c'
  end

  module Google
    module Protobuf
      module Internal
        def self.infer_package(names)
          # Package is longest common prefix ending in '.', if any.
          if not names.empty?
            min, max = names.minmax
            last_common_dot = nil
            min.size.times { |i|
              if min[i] != max[i] then break end
              if min[i] == ?. then last_common_dot = i end
            }
            if last_common_dot
              return min.slice(0, last_common_dot)
            end
          end

          nil
        end

        class NestingBuilder
          def initialize(msg_names, enum_names)
            @to_pos = {nil=>nil}
            @msg_children = Hash.new { |hash, key| hash[key] = [] }
            @enum_children = Hash.new { |hash, key| hash[key] = [] }

            msg_names.each_with_index { |name, idx| @to_pos[name] = idx }
            enum_names.each_with_index { |name, idx| @to_pos[name] = idx }

            msg_names.each { |name| @msg_children[parent(name)] << name }
            enum_names.each { |name| @enum_children[parent(name)] << name }
          end

          def build(package)
            return build_msg(package)
          end

          private
          def build_msg(msg)
            return {
              :pos => @to_pos[msg],
              :msgs => @msg_children[msg].map { |child| build_msg(child) },
              :enums => @enum_children[msg].map { |child| @to_pos[child] },
            }
          end

          private
          def parent(name)
            idx = name.rindex(?.)
            if idx
              return name.slice(0, idx)
            else
              return nil
            end
          end
        end

        def self.fixup_descriptor(package, msg_names, enum_names)
          if package.nil?
            package = self.infer_package(msg_names + enum_names)
          end

          nesting = NestingBuilder.new(msg_names, enum_names).build(package)

          return package, nesting
        end
      end
    end
  end
end

require 'google/protobuf/repeated_field'

module Google
  module Protobuf

    def self.encode(msg)
      msg.to_proto
    end

    def self.encode_json(msg, options = {})
      msg.to_json(options)
    end

    def self.decode(klass, proto)
      klass.decode(proto)
    end

    def self.decode_json(klass, json, options = {})
      klass.decode_json(json, options)
    end

  end
end