#include <windows.h>

#include <crc32.h>
#include <msg.h>

#include <utils.h>

int utils_file_exists(const wchar_t *filePath) {
    return GetFileAttributesW(filePath) != INVALID_FILE_ATTRIBUTES;
}

uint32_t utils_file_crc32c(const wchar_t *filePath) {
    HANDLE file = CreateFileW(filePath, FILE_READ_ACCESS, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (!file) {
        msg_err_w(L"Could not open file: %ls", filePath);
    }

    LARGE_INTEGER fileSize;
    GetFileSizeEx(file, &fileSize);

    HANDLE hMap = CreateFileMappingA(file, NULL, PAGE_READONLY, 0, 0, NULL);
    char *map = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0);
    if (!map) {
        msg_err_w(L"Could not create file mapping for %ls", filePath);
    }

    uint32_t crc = crc32c(0, (unsigned char*)map, fileSize.QuadPart);

    UnmapViewOfFile(map);
    CloseHandle(hMap);
    CloseHandle(file);

    return crc;
}

char utils_env_enabled(const char *env) {
    char *envText = getenv(env);
    return envText && *envText;
}