#include <string.h>
#include "dummy_stm.h"

stm_state_t g_crr_state = {0};
stm_state_t g_prv_state = {0};
int g_prv_apps_state_car_stop = 0;

int stmTransitionState(int event, stm_state_t* state) {
    int event_no, category_no, area_no;
    int apps_state, car_state, lamp_state;

    event_no    = event & STM_MSK_EVT_NO;
    category_no = event & STM_MSK_CTG_NO;
    area_no     = event & STM_MSK_ARA_NO;

    // Backup previous state
    g_prv_state = g_crr_state;

    // Get previous state
    apps_state = g_prv_state.layer.apps.state;
    car_state  = g_prv_state.car.state;
    lamp_state = g_prv_state.lamp.state;

    // Clear current state
    memset(&g_crr_state, 0, sizeof(g_crr_state));

    switch (event_no) {
    case STM_EVT_NO_ACTIVATE:
        switch (category_no) {
        case STM_CTG_NO_HOMESCREEN:
            // Apps layer
            g_crr_state.layer.apps.state = gStmLayoutNoNone;
            g_crr_state.layer.apps.is_changed = STM_TRUE;

            // Homescreen layer
            g_crr_state.layer.homescreen.state = gStmLayoutNoHs;
            g_crr_state.layer.homescreen.is_changed = STM_TRUE;
            break;
        case STM_CTG_NO_MAP:
            switch (area_no) {
            case STM_ARA_NO_FULL:
                // Apps layer
                switch (apps_state) {
                case gStmLayoutNoMf:
                    // nop
                    break;
                default:
                    g_crr_state.layer.apps.state = gStmLayoutNoMf;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                }
                break;
            case STM_ARA_NO_NORMAL:
                // Apps layer
                switch (apps_state) {
                case gStmLayoutNoM1:
                    // nop
                    break;
                case gStmLayoutNoS1:
                    g_crr_state.layer.apps.state = gStmLayoutNoM2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                default:
                    g_crr_state.layer.apps.state = gStmLayoutNoM1;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                }
                break;
            case STM_ARA_NO_SPLIT_MAIN:
                // Apps layer
                switch (apps_state) {
                case gStmLayoutNoS1:
                case gStmLayoutNoS2:
                    g_crr_state.layer.apps.state = gStmLayoutNoS2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                default:
                    // nop
                    break;
                }
                break;
            }
            break;
        case STM_CTG_NO_GENERAL:
            switch (area_no) {
            case STM_ARA_NO_NORMAL:
                // Apps layer
                switch (apps_state) {
                case gStmLayoutNoMf:
                    // nop
                    break;
                default:
                    g_crr_state.layer.apps.state = gStmLayoutNoG;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                }
                break;
            default:
                // nop
                break;
            }
            break;
        case STM_CTG_NO_SPLITABLE:
            switch (area_no) {
            case STM_ARA_NO_NORMAL:
                // Apps layer
                switch (apps_state) {
                case gStmLayoutNoMf:
                    // nop
                    break;
                case gStmLayoutNoS1:
                    g_crr_state.layer.apps.state = gStmLayoutNoS2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                default:
                    g_crr_state.layer.apps.state = gStmLayoutNoS1;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                }
                break;
            case STM_ARA_NO_SPLIT_MAIN:
                // Apps layer
                switch (apps_state) {
                case gStmLayoutNoS1:
                    g_crr_state.layer.apps.state = gStmLayoutNoS2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                case gStmLayoutNoS2:
                    g_crr_state.layer.apps.state = gStmLayoutNoS2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                default:
                    // nop
                    break;
                }
                break;
            case STM_ARA_NO_SPLIT_SUB:
                // Apps layer
                switch (apps_state) {
                case gStmLayoutNoM1:
                    g_crr_state.layer.apps.state = gStmLayoutNoM2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                case gStmLayoutNoM2:
                    g_crr_state.layer.apps.state = gStmLayoutNoM2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                case gStmLayoutNoS1:
                    g_crr_state.layer.apps.state = gStmLayoutNoS2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                case gStmLayoutNoS2:
                    g_crr_state.layer.apps.state = gStmLayoutNoS2;
                    g_crr_state.layer.apps.is_changed = STM_TRUE;
                    break;
                default:
                    // nop
                    break;
                }
                break;
            default:
                // nop
                break;
            }
            break;
        default:
          // nop
          break;
        }
        break;
    case STM_EVT_NO_CAR_STOP:
        if (gStmCarStateNoStop != car_state) {
            g_crr_state.layer.apps.state = g_prv_apps_state_car_stop;
            g_crr_state.layer.apps.is_changed = STM_TRUE;

            g_crr_state.car.state = gStmCarStateNoStop;
            g_crr_state.car.is_changed = STM_TRUE;
        }
        break;
    case STM_EVT_NO_CAR_RUN:
        if (gStmCarStateNoRun != car_state) {
            g_prv_apps_state_car_stop = apps_state;
            g_crr_state.layer.apps.state = gStmLayoutNoM1;
            g_crr_state.layer.apps.is_changed = STM_TRUE;

            g_crr_state.car.state = gStmCarStateNoRun;
            g_crr_state.car.is_changed = STM_TRUE;
        }
        break;
    case STM_EVT_NO_LAMP_OFF:
        if (gStmLampStateNoOff != lamp_state) {
            g_crr_state.lamp.state = gStmLampStateNoOff;
            g_crr_state.lamp.is_changed = STM_TRUE;
        }
        break;
    case STM_EVT_NO_LAMP_ON:
        if (gStmLampStateNoOn != lamp_state) {
            g_crr_state.lamp.state = gStmLampStateNoOn;
            g_crr_state.lamp.is_changed = STM_TRUE;
        }
        break;
    default:
        // nop
        break;
    }

    // Copy current state for return
    memcpy(state, &g_crr_state, sizeof(g_crr_state));

    return 0;
}