/*
 * pop_app.c — таблица переходов оболочки, БАНК 9 (FG1).
 *
 * Модуль не рисует и не выделяет память. Это чистая политика переходов,
 * поэтому её можно проверять host-тестом без DSS/MAME. Жизненный цикл
 * ресурсов остаётся у enter/leave соответствующих состояний.
 */
#include "pop_app.h"

pop_app_state_t pop_app_state;

void pop_app_reset(void) __banked
{
    pop_app_state = POP_APP_BOOT;
}

uint8_t pop_app_dispatch(pop_app_event_t event) __banked
{
    pop_app_state_t next = pop_app_state;
    uint8_t accepted = 0;

    switch (pop_app_state) {
    case POP_APP_BOOT:
        if (event == POP_APP_EV_BOOT_READY) {
            next = POP_APP_BUILD_INFO; accepted = 1;
        }
        break;

    case POP_APP_BUILD_INFO:
        if (event == POP_APP_EV_BUILD_DONE) {
            next = POP_APP_TITLE; accepted = 1;
        }
        break;

    case POP_APP_TITLE:
        if (event == POP_APP_EV_INTRO_STARTED) {
            next = POP_APP_INTRO; accepted = 1;
        } else if (event == POP_APP_EV_DEMO_STARTED) {
            next = POP_APP_DEMO; accepted = 1;
        } else if (event == POP_APP_EV_NEW_GAME) {
            next = POP_APP_LEVEL_LOAD; accepted = 1;
        }
        break;

    case POP_APP_INTRO:
        if (event == POP_APP_EV_CUTSCENE_FINISHED) {
            next = POP_APP_DEMO; accepted = 1;
        } else if (event == POP_APP_EV_NEW_GAME) {
            next = POP_APP_LEVEL_LOAD; accepted = 1;
        }
        break;

    case POP_APP_DEMO:
        if (event == POP_APP_EV_DEMO_FINISHED) {
            next = POP_APP_TITLE; accepted = 1;
        } else if (event == POP_APP_EV_NEW_GAME) {
            next = POP_APP_LEVEL_LOAD; accepted = 1;
        }
        break;

    case POP_APP_LEVEL_LOAD:
        if (event == POP_APP_EV_LEVEL_READY) {
            next = POP_APP_PLAYING; accepted = 1;
        }
        break;

    case POP_APP_PLAYING:
        if (event == POP_APP_EV_PAUSE) {
            next = POP_APP_PAUSE_MENU; accepted = 1;
        } else if (event == POP_APP_EV_CUTSCENE_STARTED) {
            next = POP_APP_CUTSCENE; accepted = 1;
        } else if (event == POP_APP_EV_LEVEL_FINISHED) {
            next = POP_APP_LEVEL_LOAD; accepted = 1;
        } else if (event == POP_APP_EV_TIME_EXPIRED) {
            next = POP_APP_TIME_EXPIRED; accepted = 1;
        } else if (event == POP_APP_EV_ENDING_STARTED) {
            next = POP_APP_ENDING; accepted = 1;
        } else if (event == POP_APP_EV_RESTART_INTRO) {
            /* start_game() прямо из геймплея: так оригинал уходит в title,
             * когда игрок не нажал кнопку за 288 тиков после смерти
             * (seg000:958).  Раньше это событие принимал только pause menu. */
            next = POP_APP_TITLE; accepted = 1;
        }
        break;

    case POP_APP_PAUSE_MENU:
        if (event == POP_APP_EV_RESUME) {
            next = POP_APP_PLAYING; accepted = 1;
        } else if (event == POP_APP_EV_RESTART_INTRO) {
            /* Restart Game начинает заново именно title/intro. Сброс новой
             * игры произойдёт позже общим LEVEL_LOAD после skip/attract. */
            next = POP_APP_TITLE; accepted = 1;
        }
        break;

    case POP_APP_CUTSCENE:
        if (event == POP_APP_EV_CUTSCENE_FINISHED) {
            next = POP_APP_LEVEL_LOAD; accepted = 1;
        }
        break;

    case POP_APP_TIME_EXPIRED:
        if (event == POP_APP_EV_CUTSCENE_FINISHED) {
            next = POP_APP_TITLE; accepted = 1;
        }
        break;

    case POP_APP_ENDING:
        if (event == POP_APP_EV_ENDING_FINISHED) {
            /* Таблица рекордов — ХВОСТ end_sequence, а не отдельный экран
             * по желанию: она же дослушивает победную тему и гасит экран
             * перед возвратом в начало (seg001:5F1). */
            next = POP_APP_HALL_OF_FAME; accepted = 1;
        }
        break;

    case POP_APP_HALL_OF_FAME:
        if (event == POP_APP_EV_HOF_FINISHED) {
            next = POP_APP_TITLE; accepted = 1;
        }
        break;

    case POP_APP_QUIT:
    default:
        break;
    }

    if (event == POP_APP_EV_QUIT && pop_app_state != POP_APP_QUIT) {
        next = POP_APP_QUIT;
        accepted = 1;
    }
    if (!accepted) return 0;
    pop_app_state = next;
    return 1;
}