factorygame/util/button.c

//
// Created by bruno on 11.6.2025.
//

#include "button.h"
#include "gamestate.h"

void onStart() {
    genInitMap();
    screenType = SCREEN_GAME;
}

void onContinue() {
    if (loadGameState(autosaveName, &mainPlayer)) {
        genInitMap();
    }
    screenType = SCREEN_GAME;
}

void onCredits() {
    screenType = SCREEN_CREDITS;
}

void onNext() {
    if (!waveInfo.waveRunning && waveInfo.waveTimer > 60 * 5) {
        waveInfo.waveTimer = 60 * 5;
    }
}


void onQuit() {
    running = false;
}

void onBack() {
    screenType = SCREEN_MENU;
}

void onAtlas() {
    screenType = SCREEN_ATLAS;
}

void onFont() {
    screenType = SCREEN_FONTS;
}

Button buttons[5][BUTTON_COUNT];

void initButtons(void) {
    buttons[0][0] = (Button){
            .label = "New",
            .rect = {110, DISPLAY_HEIGHT / 2, 125, 40},
            .color = {100, 100, 0, 255},
            .callback = onStart,
            .font = &fonts[1]
    };

    buttons[0][1] = (Button){
            .label = "Continue",
            .rect = {100, DISPLAY_HEIGHT / 2 + 45, 150, 40},
            .color = {0, 100, 0, 255},
            .callback = onContinue,
            .font = &fonts[1]
    };

    buttons[0][2] = (Button){
            .label = "Credits",
            .rect = {DISPLAY_WIDTH - 200, DISPLAY_HEIGHT - 120, 150, 40},
            .color = {0, 50, 50, 255},
            .callback = onCredits,
            .font = &fonts[1]
    };

    buttons[0][3] = (Button){
            .label = "Exit",
            .rect = {DISPLAY_WIDTH - 200, DISPLAY_HEIGHT - 40, 100, 40},
            .color = {100, 0, 0, 255},
            .callback = onQuit,
            .font = &fonts[1]
    };

    buttons[1][0] = (Button){
            .label = "Back",
            .rect = {DISPLAY_WIDTH / 2 - (100 / 2), DISPLAY_HEIGHT - 40, 100, 40},
            .color = {100, 0, 0, 255},
            .callback = onBack,
            .font = &fonts[1]
    };

    buttons[1][1] = (Button){
            .label = "Font atlas",
            .rect = {DISPLAY_WIDTH - 900, DISPLAY_HEIGHT - 40, 200, 40},
            .color = {100, 0, 0, 255},
            .callback = onFont,
            .font = &fonts[1]
    };

    buttons[1][2] = (Button){
            .label = "Texture atlas",
            .rect = {DISPLAY_WIDTH - 300, DISPLAY_HEIGHT - 40, 250, 40},
            .color = {100, 0, 0, 255},
            .callback = onAtlas,
            .font = &fonts[1]
    };

    buttons[2][0] = (Button){
            .label = "Next",
            .rect = {395, 0, 55, 80},
            .color = {64, 64, 64, 64},
            .callback = onNext,
            .font = &fonts[2]
    };

    buttons[3][0] = (Button){
            .label = "Back",
            .rect = {DISPLAY_WIDTH / 2 - (400 / 2), DISPLAY_HEIGHT - 40, 100, 40},
            .color = {100, 0, 0, 255},
            .callback = onCredits,
            .font = &fonts[1]
    };

    buttons[4][0] = (Button){
            .label = "Back",
            .rect = {DISPLAY_WIDTH / 2 - (400 / 2), DISPLAY_HEIGHT - 40, 100, 40},
            .color = {100, 0, 0, 255},
            .callback = onCredits,
            .font = &fonts[1]
    };
}


void renderButtons(SDL_Renderer *renderer, Player player) {
    for (int i = 0; i < BUTTON_COUNT; i++) {
        renderButton(renderer, buttons[screenType][i], player);
    }
}


void renderButton(SDL_Renderer *renderer, Button btn, Player player) {
    if (btn.font == NULL || btn.label == NULL || strlen(btn.label) == 0) {
        return;
    }

    // Check for hover/click
    bool hovered = (player.cursor.windowX >= btn.rect.x && player.cursor.windowX <= btn.rect.x + btn.rect.w &&
                    player.cursor.windowY >= btn.rect.y && player.cursor.windowY <= btn.rect.y + btn.rect.h);

    // Set color and draw background
    SDL_Color bgColor = btn.color;
    if (hovered) {
        bgColor.a = btn.color.a / 2;
    }
    SDL_SetRenderDrawColor(renderer, bgColor.r, bgColor.g, bgColor.b, bgColor.a);
    SDL_RenderFillRect(renderer, &btn.rect);

    // Split label into lines
    const char *label = btn.label;
    const int maxLines = 10; // Hard cap for sanity
    const char *lines[maxLines];
    int lineCount = 0;

    lines[lineCount++] = label;
    for (const char *p = label; *p && lineCount < maxLines; p++) {
        if (*p == '\n') {
            lines[lineCount++] = p + 1;
        }
    }

    // Get length of each line and find max width (for centering)
    int maxLineWidth = 0;
    int lineWidths[maxLines];
    int fontSize = btn.font->size;

    for (int i = 0; i < lineCount; i++) {
        const char *lineStart = lines[i];
        const char *lineEnd = strchr(lineStart, '\n');
        int lineLen = lineEnd ? (lineEnd - lineStart) : strlen(lineStart);

        int lineWidth = lineLen * fontSize;
        lineWidths[i] = lineWidth;
        if (lineWidth > maxLineWidth) {
            maxLineWidth = lineWidth;
        }
    }

    // Calculate starting Y to vertically center all lines
    int totalHeight = lineCount * fontSize;
    int startY = btn.rect.y + (btn.rect.h - totalHeight) / 2;

    // Render each line centered horizontally
    for (int i = 0; i < lineCount; i++) {
        const char *lineStart = lines[i];
        const char *lineEnd = strchr(lineStart, '\n');
        int lineLen = lineEnd ? (lineEnd - lineStart) : strlen(lineStart);

        char buffer[256];
        strncpy(buffer, lineStart, lineLen);
        buffer[lineLen] = '\0';

        int x = btn.rect.x + (btn.rect.w - lineWidths[i]) / 2;
        int y = startY + i * fontSize;

        renderText(renderer, *btn.font, buffer, x, y);
    }

    // Trigger callback if clicked
    if (hovered && (player.mouseButtons & SDL_BUTTON_LMASK)) {
        if (btn.callback) {
            btn.callback();
        }
    }
}