/*
 * Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibTest/TestCase.h>

#include <LibUnicode/CharacterTypes.h>
#include <ctype.h>

static void compare_to_ascii(auto& old_function, auto& new_function)
{
    i64 result1 = 0;
    i64 result2 = 0;

    for (u32 i = 0; i < 0x80; ++i) {
        EXPECT_EQ(result1 = old_function(i), result2 = new_function(i));
        if (result1 != result2)
            dbgln("Function input value was {}.", i);
    }
}

TEST_CASE(to_unicode_lowercase)
{
    compare_to_ascii(tolower, Unicode::to_unicode_lowercase);

    EXPECT_EQ(Unicode::to_unicode_lowercase(0x03c9u), 0x03c9u); // "ω" to "ω"
    EXPECT_EQ(Unicode::to_unicode_lowercase(0x03a9u), 0x03c9u); // "Ω" to "ω"

    // Code points encoded by ranges in UnicodeData.txt
    EXPECT_EQ(Unicode::to_unicode_lowercase(0x3400u), 0x3400u);
    EXPECT_EQ(Unicode::to_unicode_lowercase(0x3401u), 0x3401u);
    EXPECT_EQ(Unicode::to_unicode_lowercase(0x3402u), 0x3402u);
    EXPECT_EQ(Unicode::to_unicode_lowercase(0x4dbfu), 0x4dbfu);
}

TEST_CASE(to_unicode_uppercase)
{
    compare_to_ascii(toupper, Unicode::to_unicode_uppercase);

    EXPECT_EQ(Unicode::to_unicode_uppercase(0x03c9u), 0x03a9u); // "ω" to "Ω"
    EXPECT_EQ(Unicode::to_unicode_uppercase(0x03a9u), 0x03a9u); // "Ω" to "Ω"

    // Code points encoded by ranges in UnicodeData.txt
    EXPECT_EQ(Unicode::to_unicode_uppercase(0x3400u), 0x3400u);
    EXPECT_EQ(Unicode::to_unicode_uppercase(0x3401u), 0x3401u);
    EXPECT_EQ(Unicode::to_unicode_uppercase(0x3402u), 0x3402u);
    EXPECT_EQ(Unicode::to_unicode_uppercase(0x4dbfu), 0x4dbfu);
}