#define _UNICODE


#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <assert.h>
#include <conio.h>


int main(int argc, char** argv) {
    HANDLE consoleInput = GetStdHandle(STD_INPUT_HANDLE);
    HANDLE consoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
    assert((consoleInput == INVALID_HANDLE_VALUE) == 0);
    assert((consoleOutput == INVALID_HANDLE_VALUE) == 0);
    assert(SetConsoleMode(consoleInput, ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT) == TRUE);

    HANDLE consoleFrontbuffer = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
    HANDLE consoleBackbuffer = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
    assert((consoleFrontbuffer == INVALID_HANDLE_VALUE) == 0);
    assert((consoleBackbuffer == INVALID_HANDLE_VALUE) == 0);

    CONSOLE_SCREEN_BUFFER_INFO frontbufferInfo = {};
    CONSOLE_SCREEN_BUFFER_INFO backbufferInfo = {};
    assert(GetConsoleScreenBufferInfo(consoleFrontbuffer, &frontbufferInfo) != 0);
    assert(GetConsoleScreenBufferInfo(consoleBackbuffer, &backbufferInfo) != 0);

    int bufferWidth = frontbufferInfo.dwSize.X;
    int bufferHeight = frontbufferInfo.dwSize.Y;
    CHAR_INFO* bufferContent = malloc(sizeof(CHAR_INFO) * (bufferWidth * bufferHeight));
    SMALL_RECT bufferRegion = { 0, 0, bufferWidth - 1, bufferHeight - 1 };
    COORD bufferSize = { bufferWidth, bufferHeight };
    COORD writeCoord = { 0, 0 };

    for (int x = 0; x < bufferWidth; x++) {
        for (int y = 0; y < bufferHeight; y++) {
            int index = y * bufferWidth + x;
            bufferContent[index].Attributes = 7 | 0;
            bufferContent[index].Char.AsciiChar = 'X';
        }
    }

    assert(WriteConsoleOutput(consoleFrontbuffer, bufferContent, bufferSize, writeCoord, &bufferRegion) != 0);
    assert(SetConsoleActiveScreenBuffer(consoleFrontbuffer) != 0);
    SleepEx(1000, FALSE);

    for (int x = 0; x < bufferWidth; x++) {
        for (int y = 0; y < bufferHeight; y++) {
            int index = y * bufferWidth + x;
            bufferContent[index].Attributes = 2 | 0;
            bufferContent[index].Char.AsciiChar = 'Y';
        }
    }

    assert(WriteConsoleOutput(consoleBackbuffer, bufferContent, bufferSize, writeCoord, &bufferRegion) != 0);
    assert(SetConsoleActiveScreenBuffer(consoleBackbuffer) != 0);
    SleepEx(1000, FALSE);

    // this part is copy+paste
    // i used a char* previously which also didn't work
    TCHAR _readBuffer[1024];
    DWORD readCharsCount = 0;
    DWORD _readBufferSize = _tcslen(_readBuffer);
    assert(ReadConsole(consoleInput, _readBuffer, _readBufferSize, &readCharsCount, NULL) == TRUE);
    // fprintf(stdout, "readCharsCount %lu\n", readCharsCount);

    // this also doesn't work for me
    // DWORD readEventsCount;
    // INPUT_RECORD irBuffer[1024];
    // assert(ReadConsoleInput(consoleInput, irBuffer, 1024, &readEventsCount) == TRUE);
    // fprintf(stdout, "readEventsCount %lu\n", readEventsCount);

    free(bufferContent);
    CloseHandle(consoleInput);
    CloseHandle(consoleOutput);

    return EXIT_SUCCESS;
}