#include <frequency_select.h>

bool isInArea(ImVec2 val, ImVec2 min, ImVec2 max) {
    return val.x >= min.x && val.x < max.x && val.y >= min.y && val.y < max.y;
}

FrequencySelect::FrequencySelect() {
    
}

void FrequencySelect::init() {
    font = ImGui::GetIO().Fonts->AddFontFromFileTTF("res/fonts/Roboto-Medium.ttf", 42.0f);
    for (int i = 0; i < 12; i++) {
        digits[i] = 0;
    }
}

void FrequencySelect::onPosChange() {
    int digitHeight = ImGui::CalcTextSize("0").y;
    int commaOffset = 0;
    for (int i = 0; i < 12; i++) {
        digitTopMins[i] = ImVec2(widgetPos.x + (i * 22) + commaOffset, widgetPos.y);
        digitBottomMins[i] = ImVec2(widgetPos.x + (i * 22) + commaOffset, widgetPos.y + (digitHeight / 2));

        digitTopMaxs[i] = ImVec2(widgetPos.x + (i * 22) + commaOffset + 22, widgetPos.y + (digitHeight / 2));
        digitBottomMaxs[i] = ImVec2(widgetPos.x + (i * 22) + commaOffset + 22, widgetPos.y + digitHeight);

        if ((i + 1) % 3 == 0 && i < 11) {
            commaOffset += 12;
        }
    }
}

void FrequencySelect::onResize() {
    
}

void FrequencySelect::incrementDigit(int i) {
    if (i < 0) {
        return;
    }
    if (digits[i] < 9) {
        digits[i]++;
    }
    else {
        digits[i] = 0;
        incrementDigit(i - 1);
    }
    frequencyChanged = true;
}

void FrequencySelect::decrementDigit(int i) {
    if (i < 0) {
        return;
    }
    if (digits[i] > 0) {
        digits[i]--;
    }
    else {
        digits[i] = 9;
        decrementDigit(i - 1);
    }
    frequencyChanged = true;
}

void FrequencySelect::draw() {
    window = ImGui::GetCurrentWindow();
    widgetPos = ImGui::GetWindowContentRegionMin();
    widgetEndPos = ImGui::GetWindowContentRegionMax();
    widgetPos.x += window->Pos.x + 255;
    widgetPos.y += window->Pos.y - 3;
    widgetEndPos.x += window->Pos.x + 255;
    widgetEndPos.y += window->Pos.y - 3;
    widgetSize = ImVec2(widgetEndPos.x - widgetPos.x, widgetEndPos.y - widgetPos.y);

    ImGui::PushFont(font);

    if (widgetPos.x != lastWidgetPos.x || widgetPos.y != lastWidgetPos.y) {
        lastWidgetPos = widgetPos;
        onPosChange();
    }
    if (widgetSize.x != lastWidgetSize.x || widgetSize.y != lastWidgetSize.y) {
        lastWidgetSize = widgetSize;
        onResize();
    }

    int commaOffset = 0;
    bool zeros = true;
    for (int i = 0; i < 12; i++) {
        if (digits[i] != 0) {
            zeros = false;
        }
        sprintf(buf, "%d", digits[i]);
        window->DrawList->AddText(ImVec2(widgetPos.x + (i * 22) + commaOffset, widgetPos.y), 
                                zeros ? IM_COL32(90, 90, 90, 255) : IM_COL32(255, 255, 255, 255), buf);
        if ((i + 1) % 3 == 0 && i < 11) {
            commaOffset += 12;
            window->DrawList->AddText(ImVec2(widgetPos.x + (i * 22) + commaOffset + 10, widgetPos.y), 
                                    zeros ? IM_COL32(90, 90, 90, 255) : IM_COL32(255, 255, 255, 255), ".");
        }
    }

    ImVec2 mousePos = ImGui::GetMousePos();
    bool leftClick = ImGui::IsMouseClicked(ImGuiMouseButton_Left);
    bool rightClick = ImGui::IsMouseClicked(ImGuiMouseButton_Right);
    int mw = ImGui::GetIO().MouseWheel;
    bool onDigit = false;

    for (int i = 0; i < 12; i++) {
        onDigit = false;
        if (isInArea(mousePos, digitTopMins[i], digitTopMaxs[i])) {
            window->DrawList->AddRectFilled(digitTopMins[i], digitTopMaxs[i], IM_COL32(255, 0, 0, 75));
            if (leftClick) {
                incrementDigit(i);
            }
            onDigit = true;
        }
        if (isInArea(mousePos, digitBottomMins[i], digitBottomMaxs[i])) {
            window->DrawList->AddRectFilled(digitBottomMins[i], digitBottomMaxs[i], IM_COL32(0, 0, 255, 75));
            if (leftClick) {
                decrementDigit(i);
            }
            onDigit = true;
        }
        if (onDigit) {
            if (rightClick) {
                for (int j = i; j < 12; j++) {
                    digits[j] = 0;
                }
                frequencyChanged = true;
            }
            if (mw != 0) {
                int count = abs(mw);
                for (int j = 0; j < count; j++) {
                    mw > 0 ? incrementDigit(i) : decrementDigit(i);
                }
            }
        }
    }

    long freq = 0;
    for (int i = 0; i < 12; i++) {
        freq += digits[i] * pow(10, 11 - i);
    }
    frequency = freq;

    ImGui::PopFont();
    ImGui::NewLine();
}

void FrequencySelect::setFrequency(long freq) {
    int i = 11;
    for (long f = freq; i >= 0; i--) {
        digits[i] = f % 10;
        f -= digits[i];
        f /= 10;
    }
    frequency = freq;
}