// Copyright 2008, Google Inc.
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//
//     * Redistributions of source code must retain the above copyright
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#include "gmock/gmock.h"
#include "gmock/internal/gmock-port.h"

namespace testing {

    GMOCK_DEFINE_bool_(catch_leaked_mocks, true,
                       "true if and only if Google Mock should report leaked "
                       "mock objects as failures.");

    GMOCK_DEFINE_string_(verbose, internal::kWarningVerbosity,
                         "Controls how verbose Google Mock's output is."
                         "  Valid values:\n"
                         "  info    - prints all messages.\n"
                         "  warning - prints warnings and errors.\n"
                         "  error   - prints errors only.");

    GMOCK_DEFINE_int32_(default_mock_behavior, 1,
                        "Controls the default behavior of mocks."
                        "  Valid values:\n"
                        "  0 - by default, mocks act as NiceMocks.\n"
                        "  1 - by default, mocks act as NaggyMocks.\n"
                        "  2 - by default, mocks act as StrictMocks.");

    namespace internal {

// Parses a string as a command line flag.  The string should have the
// format "--gmock_flag=value".  When def_optional is true, the
// "=value" part can be omitted.
//
// Returns the value of the flag, or NULL if the parsing failed.
        static const char *ParseGoogleMockFlagValue(const char *str,
                                                    const char *flag,
                                                    bool def_optional) {
            // str and flag must not be NULL.
            if (str == nullptr || flag == nullptr) return nullptr;

            // The flag must start with "--gmock_".
            const std::string flag_str = std::string("--gmock_") + flag;
            const size_t flag_len = flag_str.length();
            if (strncmp(str, flag_str.c_str(), flag_len) != 0) return nullptr;

            // Skips the flag name.
            const char *flag_end = str + flag_len;

            // When def_optional is true, it's OK to not have a "=value" part.
            if (def_optional && (flag_end[0] == '\0')) {
                return flag_end;
            }

            // If def_optional is true and there are more characters after the
            // flag name, or if def_optional is false, there must be a '=' after
            // the flag name.
            if (flag_end[0] != '=') return nullptr;

            // Returns the string after "=".
            return flag_end + 1;
        }

// Parses a string for a Google Mock bool flag, in the form of
// "--gmock_flag=value".
//
// On success, stores the value of the flag in *value, and returns
// true.  On failure, returns false without changing *value.
        static bool ParseGoogleMockBoolFlag(const char *str, const char *flag,
                                            bool *value) {
            // Gets the value of the flag as a string.
            const char *const value_str = ParseGoogleMockFlagValue(str, flag, true);

            // Aborts if the parsing failed.
            if (value_str == nullptr) return false;

            // Converts the string value to a bool.
            *value = !(*value_str == '0' || *value_str == 'f' || *value_str == 'F');
            return true;
        }

// Parses a string for a Google Mock string flag, in the form of
// "--gmock_flag=value".
//
// On success, stores the value of the flag in *value, and returns
// true.  On failure, returns false without changing *value.
        template<typename String>
        static bool ParseGoogleMockStringFlag(const char *str, const char *flag,
                                              String *value) {
            // Gets the value of the flag as a string.
            const char *const value_str = ParseGoogleMockFlagValue(str, flag, false);

            // Aborts if the parsing failed.
            if (value_str == nullptr) return false;

            // Sets *value to the value of the flag.
            *value = value_str;
            return true;
        }

        static bool ParseGoogleMockIntFlag(const char *str, const char *flag,
                                           int *value) {
            // Gets the value of the flag as a string.
            const char *const value_str = ParseGoogleMockFlagValue(str, flag, true);

            // Aborts if the parsing failed.
            if (value_str == nullptr) return false;

            // Sets *value to the value of the flag.
            return ParseInt32(Message() << "The value of flag --" << flag,
                              value_str, value);
        }

// The internal implementation of InitGoogleMock().
//
// The type parameter CharType can be instantiated to either char or
// wchar_t.
        template<typename CharType>
        void InitGoogleMockImpl(int *argc, CharType **argv) {
            // Makes sure Google Test is initialized.  InitGoogleTest() is
            // idempotent, so it's fine if the user has already called it.
            InitGoogleTest(argc, argv);
            if (*argc <= 0) return;

            for (int i = 1; i != *argc; i++) {
                const std::string arg_string = StreamableToString(argv[i]);
                const char *const arg = arg_string.c_str();

                // Do we see a Google Mock flag?
                if (ParseGoogleMockBoolFlag(arg, "catch_leaked_mocks",
                                            &GMOCK_FLAG(catch_leaked_mocks)) ||
                    ParseGoogleMockStringFlag(arg, "verbose", &GMOCK_FLAG(verbose)) ||
                    ParseGoogleMockIntFlag(arg, "default_mock_behavior",
                                           &GMOCK_FLAG(default_mock_behavior))) {
                    // Yes.  Shift the remainder of the argv list left by one.  Note
                    // that argv has (*argc + 1) elements, the last one always being
                    // NULL.  The following loop moves the trailing NULL element as
                    // well.
                    for (int j = i; j != *argc; j++) {
                        argv[j] = argv[j + 1];
                    }

                    // Decrements the argument count.
                    (*argc)--;

                    // We also need to decrement the iterator as we just removed
                    // an element.
                    i--;
                }
            }
        }

    }  // namespace internal

// Initializes Google Mock.  This must be called before running the
// tests.  In particular, it parses a command line for the flags that
// Google Mock recognizes.  Whenever a Google Mock flag is seen, it is
// removed from argv, and *argc is decremented.
//
// No value is returned.  Instead, the Google Mock flag variables are
// updated.
//
// Since Google Test is needed for Google Mock to work, this function
// also initializes Google Test and parses its flags, if that hasn't
// been done.
    GTEST_API_ void InitGoogleMock(int *argc, char **argv) {
        internal::InitGoogleMockImpl(argc, argv);
    }

// This overloaded version can be used in Windows programs compiled in
// UNICODE mode.
    GTEST_API_ void InitGoogleMock(int *argc, wchar_t **argv) {
        internal::InitGoogleMockImpl(argc, argv);
    }

// This overloaded version can be used on Arduino/embedded platforms where
// there is no argc/argv.
    GTEST_API_ void InitGoogleMock() {
        // Since Arduino doesn't have a command line, fake out the argc/argv arguments
        int argc = 1;
        const auto arg0 = "dummy";
        char *argv0 = const_cast<char *>(arg0);
        char **argv = &argv0;

        internal::InitGoogleMockImpl(&argc, argv);
    }

}  // namespace testing
