snakePlus/source/game_input.cpp

#include "game_input.h"

#include <bitset>
#include <cstdint>
#include <cstdio>

#include "consts.h"

bool handle_input_frame(InputContext &ctx) {
    scanKeys();
    const uint32_t keys = keysDown();

    if ((keys != 0U) && *ctx.internals) {
        consoleSelect(ctx.topScreen);
        std::string key_str = "\x1b[6;0Hkeys = " + std::bitset<16>(keys).to_string();
        puts(key_str.c_str());
    }

    if (((keys & KEY_START) != 0U) && ((keys & KEY_L) != 0U)) {
        return false;
    }

    if ((keys != 0U) && ((keys & KEY_SELECT) != 0U)) {
        *ctx.internals = !(*ctx.internals);
        if (*ctx.internals) {
            setBackdropColor(RGB15(0, 0, 7));
        } else {
            setBackdropColor(RGB15(0, 0, 0));
            consoleSelect(ctx.topScreen);
            consoleClear();
            invalidate_hud(*ctx.renderAssets);
        }
    }

    if (ctx.state->scene == Scene::Menu) {
        if ((keys != 0U) && ((keys & (KEY_UP | KEY_DOWN)) != 0U)) {
            const int delta = ((keys & KEY_UP) != 0U) ? -1 : 1;
            ctx.state->menuSelection = (ctx.state->menuSelection + delta + MENU_ITEM_COUNT) % MENU_ITEM_COUNT;
            draw_menu(*ctx.state, *ctx.renderAssets, audio_is_music_enabled(*ctx.audio));
        }

        if ((keys != 0U) && (((keys & KEY_A) != 0U) || ((keys & KEY_START) != 0U))) {
            switch (ctx.state->menuSelection) {
            case 0:
                ctx.state->scene = Scene::Playing;
                ctx.init_game();
                draw_game(*ctx.state, *ctx.renderAssets);
                break;
            case 1:
                ctx.state->hardMode = !ctx.state->hardMode;
                draw_menu(*ctx.state, *ctx.renderAssets, audio_is_music_enabled(*ctx.audio));
                break;
            case 2:
                audio_toggle_music(*ctx.audio);
                draw_menu(*ctx.state, *ctx.renderAssets, audio_is_music_enabled(*ctx.audio));
                break;
            default:
                break;
            }
        }

        return true;
    }

    if ((ctx.state->paused || ctx.state->gameOver) && (keys != 0U) && ((keys & KEY_B) != 0U)) {
        ctx.state->scene = Scene::Menu;
        ctx.state->paused = false;
        draw_menu(*ctx.state, *ctx.renderAssets, audio_is_music_enabled(*ctx.audio));
        return true;
    }

    if (!ctx.state->paused && !ctx.state->gameOver) {
        const bool cursed = ctx.state->curseTicksRemaining > 0;
        uint16_t requested_dir = 0;
        bool has_dir_input = false;

        if ((keys != 0U) && ((keys & KEY_UP) != 0U)) {
            requested_dir = cursed ? 2 : 0;
            has_dir_input = true;
        } else if ((keys != 0U) && ((keys & KEY_RIGHT) != 0U)) {
            requested_dir = cursed ? 3 : 1;
            has_dir_input = true;
        } else if ((keys != 0U) && ((keys & KEY_DOWN) != 0U)) {
            requested_dir = cursed ? 0 : 2;
            has_dir_input = true;
        } else if ((keys != 0U) && ((keys & KEY_LEFT) != 0U)) {
            requested_dir = cursed ? 1 : 3;
            has_dir_input = true;
        }

        if (has_dir_input) {
            bool is_reversing = false;

            if (ctx.state->snake.size() >= 2) {
                const auto &head = ctx.state->snake.front();
                const auto &neck = ctx.state->snake.at(1);
                int next_x = head[0];
                int next_y = head[1];

                switch (requested_dir) {
                case 0:
                    next_y--;
                    break;
                case 1:
                    next_x++;
                    break;
                case 2:
                    next_y++;
                    break;
                case 3:
                    next_x--;
                    break;
                default:
                    break;
                }

                if (next_x > X_MAX) {
                    next_x = 0;
                } else if (next_x < 0) {
                    next_x = X_MAX;
                }

                if (next_y > Y_MAX) {
                    next_y = 0;
                } else if (next_y < 0) {
                    next_y = Y_MAX;
                }

                if (next_x == neck[0] && next_y == neck[1]) {
                    is_reversing = true;
                }
            } else {
                if ((ctx.state->snakeDirection + 2) % 4 == requested_dir) {
                    is_reversing = true;
                }
            }

            if (is_reversing) {
                audio_play_denied(*ctx.audio);
            } else if (ctx.state->snakeDirection != requested_dir) {
                ctx.state->snakeDirection = requested_dir;
                draw_game(*ctx.state, *ctx.renderAssets);
            }
        }
    }

    if (ctx.state->paused) {
        if ((keys != 0U) && ((keys & KEY_X) != 0U)) {
            audio_toggle_music(*ctx.audio);
        }

        if ((keys != 0U) && ((keys & KEY_Y) != 0U)) {
            ctx.state->hardMode = !ctx.state->hardMode;
            ctx.init_game();
            draw_game(*ctx.state, *ctx.renderAssets);
        }
    }

    if ((keys != 0U) && ((keys & KEY_R) != 0U)) {
        lcdSwap();
    }

    if ((keys != 0U) && ((keys & KEY_START) != 0U)) {
        if (!ctx.state->gameOver) {
            ctx.state->paused = !ctx.state->paused;

            if (ctx.state->paused) {
                consoleSelect(ctx.topScreen);
                audio_play_pause(*ctx.audio);
                audio_pause_music_if_enabled(*ctx.audio);
                puts("\x1b[11;12HPaused");
                invalidate_hud(*ctx.renderAssets);
            } else {
                audio_resume_music_if_enabled(*ctx.audio);
                audio_play_unpause(*ctx.audio);
                consoleSelect(ctx.topScreen);
                consoleClear();
                invalidate_hud(*ctx.renderAssets);
            }
        } else {
            ctx.init_game();
        }
    }

    return true;
}