#include <gtest/gtest.h>

#include <base/system.h>

TEST(Str, Dist)
{
	EXPECT_EQ(str_utf8_dist("aaa", "aaa"), 0);
	EXPECT_EQ(str_utf8_dist("123", "123"), 0);
	EXPECT_EQ(str_utf8_dist("", ""), 0);
	EXPECT_EQ(str_utf8_dist("a", "b"), 1);
	EXPECT_EQ(str_utf8_dist("", "aaa"), 3);
	EXPECT_EQ(str_utf8_dist("123", ""), 3);
	EXPECT_EQ(str_utf8_dist("ä", ""), 1);
	EXPECT_EQ(str_utf8_dist("Hëllö", "Hello"), 2);
	// https://en.wikipedia.org/w/index.php?title=Levenshtein_distance&oldid=828480025#Example
	EXPECT_EQ(str_utf8_dist("kitten", "sitting"), 3);
	EXPECT_EQ(str_utf8_dist("flaw", "lawn"), 2);
	EXPECT_EQ(str_utf8_dist("saturday", "sunday"), 3);
}

TEST(Str, Utf8Isspace)
{
	EXPECT_TRUE(str_utf8_isspace(0x200b)); // Zero-width space
	EXPECT_TRUE(str_utf8_isspace(' '));
	EXPECT_FALSE(str_utf8_isspace('a'));
	// Control characters.
	for(char c = 0; c < 0x20; c++)
	{
		EXPECT_TRUE(str_utf8_isspace(c));
	}
}

TEST(Str, Utf8SkipWhitespaces)
{
	EXPECT_STREQ(str_utf8_skip_whitespaces("abc"), "abc");
	EXPECT_STREQ(str_utf8_skip_whitespaces("abc   "), "abc   ");
	EXPECT_STREQ(str_utf8_skip_whitespaces("    abc"), "abc");
	EXPECT_STREQ(str_utf8_skip_whitespaces("\xe2\x80\x8b abc"), "abc");
}

TEST(Str, Utf8TrimRight)
{
	char A1[] = "abc"; str_utf8_trim_right(A1); EXPECT_STREQ(A1, "abc");
	char A2[] = "   abc"; str_utf8_trim_right(A2); EXPECT_STREQ(A2, "   abc");
	char A3[] = "abc   "; str_utf8_trim_right(A3); EXPECT_STREQ(A3, "abc");
	char A4[] = "abc \xe2\x80\x8b"; str_utf8_trim_right(A4); EXPECT_STREQ(A4, "abc");
}

TEST(Str, Utf8CompConfusables)
{
	EXPECT_TRUE(str_utf8_comp_confusable("abc", "abc") == 0);
	EXPECT_TRUE(str_utf8_comp_confusable("rn", "m") == 0);
	EXPECT_TRUE(str_utf8_comp_confusable("l", "ӏ") == 0); // CYRILLIC SMALL LETTER PALOCHKA
	EXPECT_FALSE(str_utf8_comp_confusable("o", "x") == 0);
	EXPECT_TRUE(str_utf8_comp_confusable("aceiou", "ąçęįǫų") == 0);
}

TEST(Str, Startswith)
{
	EXPECT_TRUE(str_startswith("abcdef", "abc"));
	EXPECT_FALSE(str_startswith("abc", "abcdef"));

	EXPECT_TRUE(str_startswith("xyz", ""));
	EXPECT_FALSE(str_startswith("", "xyz"));

	EXPECT_FALSE(str_startswith("house", "home"));
	EXPECT_FALSE(str_startswith("blackboard", "board"));

	EXPECT_TRUE(str_startswith("поплавать", "по"));
	EXPECT_FALSE(str_startswith("плавать", "по"));

	static const char ABCDEFG[] = "abcdefg";
	static const char ABC[] = "abc";
	EXPECT_EQ(str_startswith(ABCDEFG, ABC) - ABCDEFG, str_length(ABC));
}

TEST(Str, Endswith)
{
	EXPECT_TRUE(str_endswith("abcdef", "def"));
	EXPECT_FALSE(str_endswith("def", "abcdef"));

	EXPECT_TRUE(str_endswith("xyz", ""));
	EXPECT_FALSE(str_endswith("", "xyz"));

	EXPECT_FALSE(str_endswith("rhyme", "mine"));
	EXPECT_FALSE(str_endswith("blackboard", "black"));

	EXPECT_TRUE(str_endswith("люди", "юди"));
	EXPECT_FALSE(str_endswith("люди", "любовь"));

	static const char ABCDEFG[] = "abcdefg";
	static const char DEFG[] = "defg";
	EXPECT_EQ(str_endswith(ABCDEFG, DEFG) - ABCDEFG,
		str_length(ABCDEFG) - str_length(DEFG));
}