#include "vkvm.h"
#include "internal.h"
#include "SharedMemoryAccess.h"

#include <unistd.h>
#include <csignal>

void initialize(int pid) {
    impl.sharedMemoryPid = pid;
    impl.sharedMemoryKey = 12345;
    impl.sharedMemorySize = 8000;

    //set default values
    setCharactersPerRow(60);
    setCharactersPerColumn(20);
    setHeight(600);
    setWidth(800);
    setMousePosition(42,42);
    setBackgroundColor(Color(200,50,20));
    setForegroundColor(Color(20,200,50));
    setMode(GraphicMode::TrueColor);
    setRedrawInterval(20);
    setTimerInterruptInterval(10);
}

bool registerEvent(EventType type, std::function<void()> handler) {
    int signum = SIGUSR1 + impl.eventTable.size();
    auto ivt = getInterrupTable();

    lockSharedMemory();

    ivt[type].pid = getpid();
    ivt[type].signum = signum;
    impl.eventTable.push_back(handler);

    onSignal(signum, [](int sig){
        if(sig >= SIGUSR1){
            if((sig - SIGUSR1) < impl.eventTable.size()){
                impl.eventTable[sig - SIGUSR1]();
            }
        }
    });

    unlockSharedMemory();

    return true;
}

bool setPixel(int x, int y, Color color) {
    char *ptr = getPixelArea() + (y * getWidth() + x) * 3;
    ptr[0] = color.getRed();
    ptr[1] = color.getGreen();
    ptr[2] = color.getBlue();
    return false;
}

Color getPixel(int x, int y) {
    //TODO: other than RGB colores
    //only RGB colores for now
    unsigned char *ptr = (unsigned char *)getPixelArea() + (y * getWidth() + x) * 3;
    return Color(ptr[0], ptr[1], ptr[2]);
}

bool setText(std::string text) {
    lockSharedMemory();
    char *ptr = getTextArea();
    for(int i = 0; i < text.size();i++){
        if(i >= getCharactersPerColumn() * getCharactersPerRow()){
            break;
        }
        ptr[i] = text[i];
    }
    if(text.size() < getCharactersPerColumn() * getCharactersPerRow()){
        ptr[text.size()] = '\0';
    }
    unlockSharedMemory();
    return true;
}

std::string getText() {
    return std::string (getTextArea());
}

LayoutVersion getLayoutVersion() {
    return (LayoutVersion)getRegisters()->layout_version;
}

void reset() {
    //TODO
}

int getWidth() {
    return getRegisters()->width_pixels;
}

void setWidth(int newValue) {
    lockSharedMemory();
    getRegisters()->width_pixels = newValue;
    unlockSharedMemory();
}

int getHeight() {
    return getRegisters()->height_pixels;
}

void setHeight(int newValue) {
    lockSharedMemory();
    getRegisters()->height_pixels = newValue;
    unlockSharedMemory();
}

GraphicMode getMode() {
    return getRegisters()->graphicMode;
}

void setMode(GraphicMode newValue) {
    lockSharedMemory();
    getRegisters()->graphicMode = newValue;
    unlockSharedMemory();
}

int getRedrawInterval() {
    return getRegisters()->autoRedrawInterval;
}

void setRedrawInterval(int newValue) {
    lockSharedMemory();
    getRegisters()->autoRedrawInterval = newValue;
    unlockSharedMemory();
}

int getTimerInterruptInterval() {
    return getRegisters()->timerInterruptInterval;
}

void setTimerInterruptInterval(int newValue) {
    lockSharedMemory();
    getRegisters()->timerInterruptInterval = newValue;
    unlockSharedMemory();
}

Color getBackgroundColor() {
    return getRegisters()->background_color;
}

void setBackgroundColor(Color newValue) {
    lockSharedMemory();
    getRegisters()->background_color = newValue;
    unlockSharedMemory();
}

Color getForegroundColor() {
    return getRegisters()->foreground_color;
}

void setForegroundColor(Color newValue) {
    lockSharedMemory();
    getRegisters()->foreground_color = newValue;
    unlockSharedMemory();
}

int getCharactersPerRow() {
    return getRegisters()->characters_per_row;
}

int getCharactersPerColumn() {
    return getRegisters()->characters_per_column;
}

FontType getFont() {
    //TODO
    return font_1;
}

void setFont(FontType newValue) {
    //TODO
    lockSharedMemory();
    getRegisters()->textMode_font = 0;
    unlockSharedMemory();
}

std::pair<int, int> getMousePosition() {
    return {getRegisters()->mouse_pos_x, getRegisters()->mouse_pos_y};
}

KeyCode getLastPressedKey() {
    //TODO
    return KeyCode(0);
}