syntax = "proto3";

package proto;

// STRUCTS
message angles {
    float pitch = 1;
    float yaw = 2;
}

message coords {
    int32 x = 1;
    int32 z = 2;
}

message vec3 {
    float x = 1;
    float y = 2;
    float z = 3;
}

message ivec3 {
    int32 x = 1;
    int32 y = 2;
    int32 z = 3;
}

message entity {
    uint32 index = 1;
    coords chunk_pos = 2;
    vec3 local_pos = 3;
}

message animate {
    entity entity = 1;

    uint32 commands = 2;
    angles viewangles = 3;
    vec3 velocity = 4;
    uint32 active_item = 5;
}

message item {
    uint32 index = 1; // in inventory
    uint32 type = 2;
    uint32 quantity = 3;
}

message item_array {
    repeated item items = 1;
}

message player {
    animate animate = 1;
    item_array inventory = 2;
}
// END STRUCTS

//  PACKETS
message auth {
    string username = 1;
    string password = 2;
}

message init {
    uint64 seed = 1;
    int32 draw_distance = 2;
    player localplayer = 3;
    uint32 tickrate = 4;
    uint32 tick = 5;
}

message move {
    uint32 commands = 1;
    angles viewangles = 2;
    uint32 active_item = 3;
    uint32 sequence = 4;
}

message remove_entity {
    uint32 index = 1;
}

message say {
    string text = 1;
}

message hear_player {
    uint32 index = 1;
    string text = 2;
}

message request_chunk {
    coords chunk_pos = 1;
}

message remove_chunk {
    coords chunk_pos = 1;
}

message chunk {
    coords chunk_pos = 1;
    // There is no uint8, so we have to pack four blocks into each uint32.
    repeated uint32 blocks = 2 [packed = true];
}

message add_block {
    coords chunk_pos = 1;
    ivec3 block_pos = 2;
    // A bit inefficient as we only need 8 bits. We could use the rest for other
    // stuff down the road.
    uint32 active_item = 3;
}

message remove_block {
    coords chunk_pos = 1;
    ivec3 block_pos = 2;
}

message server_message {
    string message = 1;
    bool fatal = 2;
}

message item_swap { // client sent, swap items in an array of items 
    uint32 index_a = 1;
    uint32 index_b = 2;
}

message item_use { // client sent, uses an item
    uint32 index = 1;
}

message item_update { // server sent, reflects any inventory changes
    repeated item items = 1;
}

message animate_update {
    animate animate = 1;
    uint32 tick = 2;
    optional uint32 sequence = 3;
}

// END OF PACKETS

// Actual thing we read.
message packet {

oneof contents {
    auth auth_packet = 1;
    init init_packet = 2;
    move move_packet = 3;
    animate_update animate_update_packet = 4;
    remove_entity remove_entity_packet = 5;
    say say_packet = 6;
    hear_player hear_player_packet = 7;
    request_chunk request_chunk_packet = 8;
    chunk chunk_packet = 9;
    remove_chunk remove_chunk_packet = 10;
    add_block add_block_packet = 11;
    remove_block remove_block_packet = 12;
    server_message server_message_packet = 13;
    item_swap item_swap_packet = 14;
    item_use item_use_packet = 16;
    item_update item_update_packet = 15;
}

}