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// Licensed to the Software Freedom Conservancy (SFC) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The SFC licenses this file
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// to you under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//     http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "CommandLineArguments.h"
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#include "logging.h"
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CommandLineArguments::CommandLineArguments(int argc, _TCHAR* argv[]) {
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  this->ParseArguments(argc, argv);
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}
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CommandLineArguments::~CommandLineArguments(void) {
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}
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std::wstring CommandLineArguments::GetValue(std::wstring arg_name,
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                                            std::wstring default_value) {
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  std::map<std::wstring, std::wstring>::const_iterator it = 
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      this->args_map_.find(arg_name);
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  if (it != this->args_map_.end()) {
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    return it->second;
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  }
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  return default_value;
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}
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void CommandLineArguments::ParseArguments(int argc, _TCHAR* argv[]) {
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  this->is_help_requested_ = false;
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  this->is_version_requested_ = false;
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  for (int i = 1; i < argc; ++i) {
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    std::wstring raw_arg(argv[i]);
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    int switch_delimiter_length = GetSwitchDelimiterLength(raw_arg);
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    std::wstring arg = raw_arg.substr(switch_delimiter_length);
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    size_t equal_pos = arg.find(L"=");
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    std::wstring arg_name = L"";
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    std::wstring arg_value = L"";
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    if (equal_pos != std::string::npos && equal_pos > 0) { 
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      arg_name = arg.substr(0, equal_pos);
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      arg_value = arg.substr(equal_pos + 1);
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    } else {
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      arg_name = arg;
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    }
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    // coerce all argument names to lowercase, making argument names
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    // case-insensitive.
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    std::transform(arg_name.begin(), arg_name.end(), arg_name.begin(), tolower);
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    // trim single and double quotes from argument value begin and end
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    size_t startpos = arg_value.find_first_not_of(L"'\"");    
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    if (startpos != std::string::npos) {
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      arg_value = arg_value.substr(startpos);
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    }
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    size_t endpos = arg_value.find_last_not_of(L"'\"");
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    if (endpos != std::string::npos) {
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      arg_value = arg_value.substr(0, endpos + 1);
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    }
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    if (arg_name == L"?" || arg_name == L"h" || arg_name == L"help") {
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      this->is_help_requested_ = true;
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    }
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    if (arg_name == L"v" || arg_name == L"version") {
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      this->is_version_requested_ = true;
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    }
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    this->args_map_[arg_name] = arg_value;
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  }
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}
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int CommandLineArguments::GetSwitchDelimiterLength(std::wstring arg) {
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  if (arg.find(L"--") == 0) {
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    return 2;
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  } else if (arg.find(L"-") == 0 || arg.find(L"/") == 0) {
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    return 1;
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  }
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  return 0;
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}
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