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// Google Mock - a framework for writing C++ mock classes.
//
// This file implements cardinalities.

#include "gmock/gmock-cardinalities.h"

#include <limits.h>
#include <ostream>  // NOLINT
#include <sstream>
#include <string>
#include "gmock/internal/gmock-internal-utils.h"
#include "gtest/gtest.h"

namespace testing {

namespace {

// Implements the Between(m, n) cardinality.
class BetweenCardinalityImpl : public CardinalityInterface {
public:
 BetweenCardinalityImpl(int min, int max)
     : min_(min >= 0 ? min : 0),
       max_(max >= min_ ? max : min_) {
   std::stringstream ss;
   if (min < 0) {
     ss << "The invocation lower bound must be >= 0, "
        << "but is actually " << min << ".";
     internal::Expect(false, __FILE__, __LINE__, ss.str());
   } else if (max < 0) {
     ss << "The invocation upper bound must be >= 0, "
        << "but is actually " << max << ".";
     internal::Expect(false, __FILE__, __LINE__, ss.str());
   } else if (min > max) {
     ss << "The invocation upper bound (" << max
        << ") must be >= the invocation lower bound (" << min
        << ").";
     internal::Expect(false, __FILE__, __LINE__, ss.str());
   }
 }

 // Conservative estimate on the lower/upper bound of the number of
 // calls allowed.
 int ConservativeLowerBound() const override { return min_; }
 int ConservativeUpperBound() const override { return max_; }

 bool IsSatisfiedByCallCount(int call_count) const override {
   return min_ <= call_count && call_count <= max_;
 }

 bool IsSaturatedByCallCount(int call_count) const override {
   return call_count >= max_;
 }

 void DescribeTo(::std::ostream* os) const override;

private:
 const int min_;
 const int max_;

 GTEST_DISALLOW_COPY_AND_ASSIGN_(BetweenCardinalityImpl);
};

// Formats "n times" in a human-friendly way.
inline std::string FormatTimes(int n) {
 if (n == 1) {
   return "once";
 } else if (n == 2) {
   return "twice";
 } else {
   std::stringstream ss;
   ss << n << " times";
   return ss.str();
 }
}

// Describes the Between(m, n) cardinality in human-friendly text.
void BetweenCardinalityImpl::DescribeTo(::std::ostream* os) const {
 if (min_ == 0) {
   if (max_ == 0) {
     *os << "never called";
   } else if (max_ == INT_MAX) {
     *os << "called any number of times";
   } else {
     *os << "called at most " << FormatTimes(max_);
   }
 } else if (min_ == max_) {
   *os << "called " << FormatTimes(min_);
 } else if (max_ == INT_MAX) {
   *os << "called at least " << FormatTimes(min_);
 } else {
   // 0 < min_ < max_ < INT_MAX
   *os << "called between " << min_ << " and " << max_ << " times";
 }
}

}  // Unnamed namespace

// Describes the given call count to an ostream.
void Cardinality::DescribeActualCallCountTo(int actual_call_count,
                                           ::std::ostream* os) {
 if (actual_call_count > 0) {
   *os << "called " << FormatTimes(actual_call_count);
 } else {
   *os << "never called";
 }
}

// Creates a cardinality that allows at least n calls.
GTEST_API_ Cardinality AtLeast(int n) { return Between(n, INT_MAX); }

// Creates a cardinality that allows at most n calls.
GTEST_API_ Cardinality AtMost(int n) { return Between(0, n); }

// Creates a cardinality that allows any number of calls.
GTEST_API_ Cardinality AnyNumber() { return AtLeast(0); }

// Creates a cardinality that allows between min and max calls.
GTEST_API_ Cardinality Between(int min, int max) {
 return Cardinality(new BetweenCardinalityImpl(min, max));
}

// Creates a cardinality that allows exactly n calls.
GTEST_API_ Cardinality Exactly(int n) { return Between(n, n); }

}  // namespace testing