#include "gtest/gtest.h"
#include "Encoding.h"
#include <string>

TEST(Encoding_detect_encoding, returns_UTF_8_for_all_ascii)
{
    uint8_t buffer[] = "ABCDEFG 12345";
    EXPECT_EQ(Encoding::UTF_8, Encoding::detect_encoding(buffer, sizeof(buffer) - 1));
}

TEST(Encoding_detect_encoding, returns_UTF_8_for_valid_encodings)
{
    uint8_t buffer[] = "%\xC1\x82\xE1\x82\x83\xF1\x82\x83\x84\xF9\x82\x83\x84\x85\xFD\x82\x83\x84\x85\x86yay";
    EXPECT_EQ(Encoding::UTF_8, Encoding::detect_encoding(buffer, sizeof(buffer) - 1));
}

TEST(Encoding_detect_encoding, returns_CP_1252_if_not_valid_utf_8)
{
    uint8_t buffer[] = "ABC\xEE\xCC";
    EXPECT_EQ(Encoding::CP_1252, Encoding::detect_encoding(buffer, sizeof(buffer) - 1));
}


TEST(Encoding_num_bytes_in_code_point, returns_1_for_UTF_8_ascii_character)
{
    uint8_t buffer[] = "Z";
    EXPECT_EQ(1, Encoding::num_bytes_in_code_point(Encoding::UTF_8, buffer));
}

TEST(Encoding_num_bytes_in_code_point, returns_1_for_CP_1252_character)
{
    uint8_t buffer[] = "\x96";
    EXPECT_EQ(1, Encoding::num_bytes_in_code_point(Encoding::CP_1252, buffer));
}

TEST(Encoding_num_bytes_in_code_point, returns_3_for_UTF_8_multi_byte)
{
    uint8_t buffer[] = "\xE1\x82\x83";
    EXPECT_EQ(3, Encoding::num_bytes_in_code_point(Encoding::UTF_8, buffer));
}


TEST(Encoding_beginning_of_code_point, returns_pointer_to_beginning_of_code_point_for_UTF_8)
{
    uint8_t buffer[] = "12\xE1\x82\x83";
    EXPECT_EQ(&buffer[2], Encoding::beginning_of_code_point(Encoding::UTF_8, &buffer[4]));
}

TEST(Encoding_beginning_of_code_point, returns_pointer_to_beginning_of_code_point_for_CP_1252)
{
    uint8_t buffer[] = "12\xE1\x82\x83";
    EXPECT_EQ(&buffer[4], Encoding::beginning_of_code_point(Encoding::CP_1252, &buffer[4]));
}


TEST(Encoding_decode, decodes_UTF_8_correctly)
{
    EXPECT_EQ((uint32_t)'%', Encoding::decode(Encoding::UTF_8, (const uint8_t *)"%"));
    EXPECT_EQ(0x42u, Encoding::decode(Encoding::UTF_8, (const uint8_t *)"\xC1\x82"));
    EXPECT_EQ(0x1083u, Encoding::decode(Encoding::UTF_8, (const uint8_t *)"\xE1\x82\x83"));
    EXPECT_EQ(0x420C4u, Encoding::decode(Encoding::UTF_8, (const uint8_t *)"\xF1\x82\x83\x84"));
    EXPECT_EQ(0x1083105u, Encoding::decode(Encoding::UTF_8, (const uint8_t *)"\xF9\x82\x83\x84\x85"));
    EXPECT_EQ(0x420C4146u, Encoding::decode(Encoding::UTF_8, (const uint8_t *)"\xFD\x82\x83\x84\x85\x86"));
}

TEST(Encoding_decode, decodes_CP_1252_correctly)
{
    EXPECT_EQ(0x99u, Encoding::decode(Encoding::CP_1252, (const uint8_t *)"\x99"));
}