// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "tools/gn/value.h"

#include "base/strings/string_number_conversions.h"

Value::Value()
    : type_(NONE),
      int_value_(0),
      origin_(NULL) {
}

Value::Value(const ParseNode* origin, Type t)
    : type_(t),
      int_value_(0),
      origin_(origin) {
}

Value::Value(const ParseNode* origin, int64 int_val)
    : type_(INTEGER),
      int_value_(int_val),
      origin_(origin) {
}

Value::Value(const ParseNode* origin, const base::StringPiece& str_val)
    : type_(STRING),
      string_value_(str_val.as_string()),
      int_value_(0),
      origin_(origin) {
}

Value::~Value() {
}

// static
const char* Value::DescribeType(Type t) {
  switch (t) {
    case NONE:
      return "none";
    case INTEGER:
      return "integer";
    case STRING:
      return "string";
    case LIST:
      return "list";
    default:
      NOTREACHED();
      return "UNKNOWN";
  }
}

int64 Value::InterpretAsInt() const {
  switch (type_) {
    case NONE:
      return 0;
    case INTEGER:
      return int_value_;
    case STRING:
      return string_value_.empty() ? 0 : 1;
    case LIST:
      return list_value_.empty() ? 0 : 1;
  }
  return 0;
}

std::string Value::ToString() const {
  switch (type_) {
    case NONE:
      return "<void>";
    case INTEGER:
      return base::Int64ToString(int_value_);
    case STRING:
      return string_value_;
    case LIST: {
      std::string result = "[";
      for (size_t i = 0; i < list_value_.size(); i++) {
        if (i > 0)
          result += ", ";
        // TODO(brettw) maybe also want to escape quotes in the string.
        if (list_value_[i].type() == STRING)
          result += std::string("\"") + list_value_[i].ToString() + "\"";
        else
          result += list_value_[i].ToString();
      }
      result.push_back(']');
      return result;
    }
  }
  return std::string();
}

bool Value::VerifyTypeIs(Type t, Err* err) const {
  if (type_ == t)
    return true;

  *err = Err(origin(), std::string("This is not a ") + DescribeType(t) + ".");
  return false;
}

bool Value::operator==(const Value& other) const {
  if (type_ != other.type_)
    return false;

  switch (type_) {
    case Value::INTEGER:
      return int_value() == other.int_value();
    case Value::STRING:
      return string_value() == other.string_value();
    case Value::LIST:
      if (list_value().size() != other.list_value().size())
        return false;
      for (size_t i = 0; i < list_value().size(); i++) {
        if (list_value()[i] != other.list_value()[i])
          return false;
      }
      return true;
    default:
      return false;
  }
}

bool Value::operator!=(const Value& other) const {
  return !operator==(other);
}