Momentum-Apps/game/enemy.c

// enemy.c
#include <game/enemy.h>
#include <notification/notification_messages.h>

static EntityContext *enemy_context_generic;

// Allocation function
static EntityContext *enemy_generic_alloc(
    const char *id,
    int index,
    Vector size,
    Vector start_position,
    Vector end_position,
    float move_timer, // Wait duration before moving again
    float speed,
    float attack_timer,
    float strength,
    float health)
{
    if (!enemy_context_generic)
    {
        enemy_context_generic = malloc(sizeof(EntityContext));
    }
    if (!enemy_context_generic)
    {
        FURI_LOG_E("Game", "Failed to allocate EntityContext");
        return NULL;
    }
    snprintf(enemy_context_generic->id, sizeof(enemy_context_generic->id), "%s", id);
    enemy_context_generic->index = index;
    enemy_context_generic->size = size;
    enemy_context_generic->start_position = start_position;
    enemy_context_generic->end_position = end_position;
    enemy_context_generic->move_timer = move_timer;   // Set wait duration
    enemy_context_generic->elapsed_move_timer = 0.0f; // Initialize elapsed timer
    enemy_context_generic->speed = speed;
    enemy_context_generic->attack_timer = attack_timer;
    enemy_context_generic->strength = strength;
    enemy_context_generic->health = health;
    // Initialize other fields as needed
    enemy_context_generic->sprite_right = NULL;          // sprite is assigned later
    enemy_context_generic->sprite_left = NULL;           // sprite is assigned later
    enemy_context_generic->direction = ENTITY_RIGHT;     // Default direction
    enemy_context_generic->state = ENTITY_MOVING_TO_END; // Start in IDLE state
    // Set radius based on size, for example, average of size.x and size.y divided by 2
    enemy_context_generic->radius = (size.x + size.y) / 4.0f;
    return enemy_context_generic;
}

// Enemy start function
static void enemy_start(Entity *self, GameManager *manager, void *context)
{
    UNUSED(manager);
    if (!self || !context)
    {
        FURI_LOG_E("Game", "Enemy start: Invalid parameters");
        return;
    }
    if (!enemy_context_generic)
    {
        FURI_LOG_E("Game", "Enemy start: Enemy context not set");
        return;
    }

    EntityContext *enemy_context = (EntityContext *)context;
    // Copy fields from generic context
    snprintf(enemy_context->id, sizeof(enemy_context->id), "%s", enemy_context_generic->id);
    enemy_context->index = enemy_context_generic->index;
    enemy_context->size = enemy_context_generic->size;
    enemy_context->start_position = enemy_context_generic->start_position;
    enemy_context->end_position = enemy_context_generic->end_position;
    enemy_context->move_timer = enemy_context_generic->move_timer;
    enemy_context->elapsed_move_timer = enemy_context_generic->elapsed_move_timer;
    enemy_context->speed = enemy_context_generic->speed;
    enemy_context->attack_timer = enemy_context_generic->attack_timer;
    enemy_context->strength = enemy_context_generic->strength;
    enemy_context->health = enemy_context_generic->health;
    enemy_context->sprite_right = enemy_context_generic->sprite_right;
    enemy_context->sprite_left = enemy_context_generic->sprite_left;
    enemy_context->direction = enemy_context_generic->direction;
    enemy_context->state = enemy_context_generic->state;
    enemy_context->radius = enemy_context_generic->radius;

    // Set enemy's initial position based on start_position
    entity_pos_set(self, enemy_context->start_position);

    // Add collision circle based on the enemy's radius
    entity_collider_add_circle(self, enemy_context->radius);
}

// Enemy render function
static void enemy_render(Entity *self, GameManager *manager, Canvas *canvas, void *context)
{
    if (!self || !context || !canvas || !manager)
        return;

    EntityContext *enemy_context = (EntityContext *)context;

    // Get the position of the enemy
    Vector pos = entity_pos_get(self);

    // Get the camera position
    int x_pos = pos.x - camera_x - enemy_context->size.x / 2;
    int y_pos = pos.y - camera_y - enemy_context->size.y / 2;

    // check if position is within the screen
    if (x_pos + enemy_context->size.x < 0 || x_pos > SCREEN_WIDTH || y_pos + enemy_context->size.y < 0 || y_pos > SCREEN_HEIGHT)
        return;

    // Choose sprite based on direction
    Sprite *current_sprite = NULL;
    if (enemy_context->direction == ENTITY_LEFT)
    {
        current_sprite = enemy_context->sprite_left;
    }
    else
    {
        current_sprite = enemy_context->sprite_right;
    }

    // Draw enemy sprite relative to camera, centered on the enemy's position
    canvas_draw_sprite(
        canvas,
        current_sprite,
        pos.x - camera_x - (enemy_context->size.x / 2),
        pos.y - camera_y - (enemy_context->size.y / 2));

    // draw health of enemy
    char health_str[32];
    snprintf(health_str, sizeof(health_str), "%.0f", (double)enemy_context->health);
    draw_username(canvas, pos, health_str);
}

static void atk_notify(GameContext *game_context, EntityContext *enemy_context, bool player_attacked)
{
    if (!game_context || !enemy_context)
    {
        FURI_LOG_E("Game", "Send attack notification: Invalid parameters");
        return;
    }

    NotificationApp *notifications = furi_record_open(RECORD_NOTIFICATION);

    const bool vibration_allowed = strstr(yes_or_no_choices[vibration_on_index], "Yes") != NULL;
    const bool sound_allowed = strstr(yes_or_no_choices[sound_on_index], "Yes") != NULL;

    if (player_attacked)
    {
        if (vibration_allowed && sound_allowed)
        {
            notification_message(notifications, &sequence_success);
        }
        else if (vibration_allowed && !sound_allowed)
        {
            notification_message(notifications, &sequence_single_vibro);
        }
        else if (!vibration_allowed && sound_allowed)
        {
            // change this to sound later
            notification_message(notifications, &sequence_blink_blue_100);
        }
        else
        {
            notification_message(notifications, &sequence_blink_blue_100);
        }
        FURI_LOG_I("Game", "Player attacked enemy '%s'!", enemy_context->id);
    }
    else
    {
        if (vibration_allowed && sound_allowed)
        {
            notification_message(notifications, &sequence_error);
        }
        else if (vibration_allowed && !sound_allowed)
        {
            notification_message(notifications, &sequence_single_vibro);
        }
        else if (!vibration_allowed && sound_allowed)
        {
            // change this to sound later
            notification_message(notifications, &sequence_blink_red_100);
        }
        else
        {
            notification_message(notifications, &sequence_blink_red_100);
        }

        FURI_LOG_I("Game", "Enemy '%s' attacked the player!", enemy_context->id);
    }

    // close the notifications
    furi_record_close(RECORD_NOTIFICATION);
}

// Enemy collision function
static void enemy_collision(Entity *self, Entity *other, GameManager *manager, void *context)
{
    if (!self || !other || !context || !manager)
    {
        FURI_LOG_E("Game", "Enemy collision: Invalid parameters");
        return;
    }
    EntityContext *enemy_context = (EntityContext *)context;
    furi_check(enemy_context, "Enemy collision: EntityContext is NULL");
    GameContext *game_context = game_manager_game_context_get(manager);
    furi_check(game_context, "Enemy collision: GameContext is NULL");
    // Check if the enemy collided with the player
    if (entity_description_get(other) == &player_desc)
    {

        // Get positions of the enemy and the player
        Vector enemy_pos = entity_pos_get(self);
        Vector player_pos = entity_pos_get(other);

        // Determine if the enemy is facing the player or player is facing the enemy
        bool enemy_is_facing_player = false;
        bool player_is_facing_enemy = false;

        // Determine if the enemy is facing the player
        if ((enemy_context->direction == ENTITY_LEFT && player_pos.x < enemy_pos.x) ||
            (enemy_context->direction == ENTITY_RIGHT && player_pos.x > enemy_pos.x) ||
            (enemy_context->direction == ENTITY_UP && player_pos.y < enemy_pos.y) ||
            (enemy_context->direction == ENTITY_DOWN && player_pos.y > enemy_pos.y))
        {
            enemy_is_facing_player = true;
        }

        // Determine if the player is facing the enemy
        if ((game_context->player_context->direction == ENTITY_LEFT && enemy_pos.x < player_pos.x) ||
            (game_context->player_context->direction == ENTITY_RIGHT && enemy_pos.x > player_pos.x) ||
            (game_context->player_context->direction == ENTITY_UP && enemy_pos.y < player_pos.y) ||
            (game_context->player_context->direction == ENTITY_DOWN && enemy_pos.y > player_pos.y))
        {
            player_is_facing_enemy = true;
        }

        // Handle Player Attacking Enemy (Press OK, facing enemy, and enemy not facing player)
        if (player_is_facing_enemy && game_context->last_button == GameKeyOk && !enemy_is_facing_player)
        {
            // Reset last button
            game_context->last_button = -1;

            if (game_context->player_context->elapsed_attack_timer >= game_context->player_context->attack_timer)
            {
                atk_notify(game_context, enemy_context, true);

                // Reset player's elapsed attack timer
                game_context->player_context->elapsed_attack_timer = 0.0f;
                enemy_context->elapsed_attack_timer = 0.0f; // Reset enemy's attack timer to block enemy attack

                // Increase XP by the enemy's strength
                game_context->player_context->xp += enemy_context->strength;

                // Increase healthy by 10% of the enemy's strength
                game_context->player_context->health += enemy_context->strength * 0.1f;
                if (game_context->player_context->health > game_context->player_context->max_health)
                {
                    game_context->player_context->health = game_context->player_context->max_health;
                }

                // Decrease enemy health by player strength
                enemy_context->health -= game_context->player_context->strength;

                if (enemy_context->health <= 0)
                {
                    enemy_context->state = ENTITY_DEAD;

                    // Reset enemy position and health
                    enemy_context->health = 100; // this needs to be set to the enemy's max health

                    // remove from game context and set in safe zone
                    game_context->enemies[enemy_context->index] = NULL;
                    game_context->enemy_count--;
                    entity_collider_remove(self);
                    entity_pos_set(self, (Vector){-100, -100});
                    return;
                }
                else
                {
                    enemy_context->state = ENTITY_ATTACKED;
                    // Vector old_pos = entity_pos_get(self);
                    //  Bounce the enemy back by X units opposite their last movement direction
                    enemy_pos.x -= game_context->player_context->dx * enemy_context->radius + game_context->icon_offset;
                    // enemy_pos.y -= game_context->player_context->dy * enemy_context->radius + game_context->icon_offset;
                    entity_pos_set(self, enemy_pos);

                    // Reset enemy's movement direction to prevent immediate re-collision
                    game_context->player_context->dx = 0;
                    game_context->player_context->dy = 0;
                }
            }
            else
            {
                FURI_LOG_I("Game", "Player attack on enemy '%s' is on cooldown: %f seconds remaining", enemy_context->id, (double)(game_context->player_context->attack_timer - game_context->player_context->elapsed_attack_timer));
            }
        }
        // Handle Enemy Attacking Player (enemy facing player)
        else if (enemy_is_facing_player)
        {
            if (enemy_context->elapsed_attack_timer >= enemy_context->attack_timer)
            {
                atk_notify(game_context, enemy_context, false);

                // Reset enemy's elapsed attack timer
                enemy_context->elapsed_attack_timer = 0.0f;

                // Decrease player health by enemy strength
                game_context->player_context->health -= enemy_context->strength;

                if (game_context->player_context->health <= 0)
                {
                    FURI_LOG_I("Game", "Player is dead.. resetting player position and health");
                    game_context->player_context->state = ENTITY_DEAD;

                    // Reset player position and health
                    entity_pos_set(other, game_context->player_context->start_position);
                    game_context->player_context->health = game_context->player_context->max_health;

                    // subtract player's XP by the enemy's strength
                    game_context->player_context->xp -= enemy_context->strength;
                    if ((int)game_context->player_context->xp < 0)
                    {
                        game_context->player_context->xp = 0;
                    }
                }
                else
                {
                    FURI_LOG_I("Game", "Player took %f damage from enemy '%s'", (double)enemy_context->strength, enemy_context->id);
                    game_context->player_context->state = ENTITY_ATTACKED;

                    // Bounce the player back by X units opposite their last movement direction
                    player_pos.x -= game_context->player_context->dx * enemy_context->radius + game_context->icon_offset;
                    // player_pos.y -= game_context->player_context->dy * enemy_context->radius + game_context->icon_offset;
                    entity_pos_set(other, player_pos);

                    // Reset player's movement direction to prevent immediate re-collision
                    game_context->player_context->dx = 0;
                    game_context->player_context->dy = 0;
                }
            }
        }
        else // handle other collisions
        {
            // Set the player's old position to prevent collision
            entity_pos_set(other, game_context->player_context->old_position);
            // Reset player's movement direction to prevent immediate re-collision
            game_context->player_context->dx = 0;
            game_context->player_context->dy = 0;
        }

        if (game_context->player_context->state == ENTITY_DEAD)
        {
            // Reset player's position and health
            entity_pos_set(other, game_context->player_context->start_position);
            game_context->player_context->health = game_context->player_context->max_health;
        }
    }
    // if not player than must be an icon or npc; so push back
    else
    {
        // push enemy back
        Vector enemy_pos = entity_pos_get(self);
        switch (enemy_context->direction)
        {
        case ENTITY_LEFT:
            enemy_pos.x += (enemy_context->size.x + game_context->icon_offset);
            break;
        case ENTITY_RIGHT:
            enemy_pos.x -= (enemy_context->size.x + game_context->icon_offset);
            break;
        case ENTITY_UP:
            enemy_pos.y += (enemy_context->size.y + game_context->icon_offset);
            break;
        case ENTITY_DOWN:
            enemy_pos.y -= (enemy_context->size.y + game_context->icon_offset);
            break;
        default:
            break;
        }
        entity_pos_set(self, enemy_pos);
    }
}

// Enemy update function
static void enemy_update(Entity *self, GameManager *manager, void *context)
{
    if (!self || !context || !manager)
        return;

    EntityContext *enemy_context = (EntityContext *)context;
    if (!enemy_context || enemy_context->state == ENTITY_DEAD)
    {
        return;
    }

    GameContext *game_context = game_manager_game_context_get(manager);
    if (!game_context)
    {
        FURI_LOG_E("Game", "Enemy update: Failed to get GameContext");
        return;
    }

    float delta_time = 1.0f / game_context->fps;

    // Increment the elapsed_attack_timer for the enemy
    enemy_context->elapsed_attack_timer += delta_time;

    switch (enemy_context->state)
    {
    case ENTITY_IDLE:
        // Increment the elapsed_move_timer
        enemy_context->elapsed_move_timer += delta_time;

        // Check if it's time to move again
        if (enemy_context->elapsed_move_timer >= enemy_context->move_timer)
        {
            // Determine the next state based on the current position
            Vector current_pos = entity_pos_get(self);
            if (fabs(current_pos.x - enemy_context->start_position.x) < (double)1.0 &&
                fabs(current_pos.y - enemy_context->start_position.y) < (double)1.0)
            {
                enemy_context->state = ENTITY_MOVING_TO_END;
            }
            else
            {
                enemy_context->state = ENTITY_MOVING_TO_START;
            }
            enemy_context->elapsed_move_timer = 0.0f;
        }
        break;

    case ENTITY_MOVING_TO_END:
    case ENTITY_MOVING_TO_START:
    case ENTITY_ATTACKED:
    {
        // Get current position
        Vector current_pos = entity_pos_get(self);
        if (enemy_context->state == ENTITY_ATTACKED)
        {
            // set direction again
            enemy_context->state = enemy_context->direction == ENTITY_LEFT ? ENTITY_MOVING_TO_START : ENTITY_MOVING_TO_END;
        }

        // Determine the target position based on the current state
        Vector target_position = (enemy_context->state == ENTITY_MOVING_TO_END) ? enemy_context->end_position : enemy_context->start_position;
        Vector direction_vector = {0, 0};

        // Calculate direction towards the target
        if (current_pos.x < target_position.x)
        {
            direction_vector.x = 1.0f;
            enemy_context->direction = ENTITY_RIGHT;
        }
        else if (current_pos.x > target_position.x)
        {
            direction_vector.x = -1.0f;
            enemy_context->direction = ENTITY_LEFT;
        }

        if (current_pos.y < target_position.y)
        {
            direction_vector.y = 1.0f;
            enemy_context->direction = ENTITY_DOWN;
        }
        else if (current_pos.y > target_position.y)
        {
            direction_vector.y = -1.0f;
            enemy_context->direction = ENTITY_UP;
        }

        // Normalize direction vector
        float length = sqrt(direction_vector.x * direction_vector.x + direction_vector.y * direction_vector.y);
        if (length != 0)
        {
            direction_vector.x /= length;
            direction_vector.y /= length;
        }

        // Update position based on direction and speed
        Vector new_pos = current_pos;
        new_pos.x += direction_vector.x * enemy_context->speed * delta_time;
        new_pos.y += direction_vector.y * enemy_context->speed * delta_time;

        // Clamp the position to the target to prevent overshooting
        if ((direction_vector.x > 0.0f && new_pos.x > target_position.x) ||
            (direction_vector.x < 0.0f && new_pos.x < target_position.x))
        {
            new_pos.x = target_position.x;
        }

        if ((direction_vector.y > 0.0f && new_pos.y > target_position.y) ||
            (direction_vector.y < 0.0f && new_pos.y < target_position.y))
        {
            new_pos.y = target_position.y;
        }

        entity_pos_set(self, new_pos);

        // Check if the enemy has reached or surpassed the target_position
        bool reached_x = fabs(new_pos.x - target_position.x) < (double)1.0;
        bool reached_y = fabs(new_pos.y - target_position.y) < (double)1.0;

        // If reached the target position on both axes, transition to IDLE
        if (reached_x && reached_y)
        {
            enemy_context->state = ENTITY_IDLE;
            enemy_context->elapsed_move_timer = 0.0f;
        }
    }
    break;

    default:
        break;
    }
}

// Free function for the entity
static void enemy_free(Entity *self, GameManager *manager, void *context)
{
    UNUSED(self);
    UNUSED(manager);
    UNUSED(context);
    if (enemy_context_generic)
    {
        free(enemy_context_generic);
        enemy_context_generic = NULL;
    }
}

// Enemy behavior structure
static const EntityDescription _generic_enemy = {
    .start = enemy_start,
    .stop = enemy_free,
    .update = enemy_update,
    .render = enemy_render,
    .collision = enemy_collision,
    .event = NULL,
    .context_size = sizeof(EntityContext),
};

// Enemy function to return the entity description
const EntityDescription *enemy(
    GameManager *manager,
    const char *id,
    int index,
    Vector start_position,
    Vector end_position,
    float move_timer, // Wait duration before moving again
    float speed,
    float attack_timer,
    float strength,
    float health)
{
    SpriteContext *sprite_context = get_sprite_context(id);
    if (!sprite_context)
    {
        FURI_LOG_E("Game", "Failed to get SpriteContext");
        return NULL;
    }

    // Allocate a new EntityContext with provided parameters
    enemy_context_generic = enemy_generic_alloc(
        id,
        index,
        (Vector){sprite_context->width, sprite_context->height},
        start_position,
        end_position,
        move_timer, // Set wait duration
        speed,
        attack_timer,
        strength,
        health);
    if (!enemy_context_generic)
    {
        FURI_LOG_E("Game", "Failed to allocate EntityContext");
        return NULL;
    }

    // assign sprites to the context
    enemy_context_generic->sprite_right = game_manager_sprite_load(manager, sprite_context->right_file_name);
    enemy_context_generic->sprite_left = game_manager_sprite_load(manager, sprite_context->left_file_name);

    // Set initial direction based on start and end positions
    if (start_position.x < end_position.x)
    {
        enemy_context_generic->direction = ENTITY_RIGHT;
    }
    else
    {
        enemy_context_generic->direction = ENTITY_LEFT;
    }

    // Set initial state based on movement
    if (start_position.x != end_position.x || start_position.y != end_position.y)
    {
        enemy_context_generic->state = ENTITY_MOVING_TO_END;
    }
    else
    {
        enemy_context_generic->state = ENTITY_IDLE;
    }
    free(sprite_context);
    return &_generic_enemy;
}

void spawn_enemy(Level *level, GameManager *manager, FuriString *json)
{
    if (!level || !manager || !json)
    {
        FURI_LOG_E("Game", "Level, GameManager, or JSON is NULL");
        return;
    }

    FuriString *id = get_json_value_furi("id", json);
    FuriString *_index = get_json_value_furi("index", json);
    //
    FuriString *start_position = get_json_value_furi("start_position", json);
    FuriString *start_position_x = get_json_value_furi("x", start_position);
    FuriString *start_position_y = get_json_value_furi("y", start_position);
    //
    FuriString *end_position = get_json_value_furi("end_position", json);
    FuriString *end_position_x = get_json_value_furi("x", end_position);
    FuriString *end_position_y = get_json_value_furi("y", end_position);
    //
    FuriString *move_timer = get_json_value_furi("move_timer", json);
    FuriString *speed = get_json_value_furi("speed", json);
    FuriString *attack_timer = get_json_value_furi("attack_timer", json);
    FuriString *strength = get_json_value_furi("strength", json);
    FuriString *health = get_json_value_furi("health", json);
    //

    if (!id || !_index || !start_position || !start_position_x || !start_position_y || !end_position || !end_position_x || !end_position_y || !move_timer || !speed || !attack_timer || !strength || !health)
    {
        FURI_LOG_E("Game", "Failed to parse JSON values");
        return;
    }

    GameContext *game_context = game_manager_game_context_get(manager);
    if (game_context && game_context->enemy_count < MAX_ENEMIES && !game_context->enemies[game_context->enemy_count])
    {
        game_context->enemies[game_context->enemy_count] = level_add_entity(level, enemy(
                                                                                       manager,
                                                                                       furi_string_get_cstr(id),
                                                                                       atoi(furi_string_get_cstr(_index)),
                                                                                       (Vector){atof_furi(start_position_x), atof_furi(start_position_y)},
                                                                                       (Vector){atof_furi(end_position_x), atof_furi(end_position_y)},
                                                                                       atof_furi(move_timer),
                                                                                       atof_furi(speed),
                                                                                       atof_furi(attack_timer),
                                                                                       atof_furi(strength),
                                                                                       atof_furi(health)));
        game_context->enemy_count++;
    }

    furi_string_free(id);
    furi_string_free(_index);
    furi_string_free(start_position);
    furi_string_free(start_position_x);
    furi_string_free(start_position_y);
    furi_string_free(end_position);
    furi_string_free(end_position_x);
    furi_string_free(end_position_y);
    furi_string_free(move_timer);
    furi_string_free(speed);
    furi_string_free(attack_timer);
    furi_string_free(strength);
    furi_string_free(health);
}