const std = @import("std");
const shared = @import("shared");
const server = @import("server.zig");

pub fn spawn(chunk: *shared.chunk.Chunk(), comptime T: type, allocator: std.mem.Allocator, value: T, w: *std.Io.Writer) !void {
    const id = server.next_entity_id;
    server.next_entity_id += 1;

    var entity = value;
    entity.id = id;

    inline for (@typeInfo(shared.chunk.Chunk()).@"struct".fields) |field| {
        if (field.type == shared.chunk.Storage(T)) {
            try @field(chunk, field.name).items.append(allocator, entity);
            return;
        }
    }

    // serialize entity
    var buffer: [64]u8 = undefined;
    var fbs = std.io.fixedBufferStream(&buffer);
    try T.encode(entity, fbs.writer());

    try shared.protocol.write_message(
        w,
        .spawn_entity,
        fbs.getWritten(),
    );
    try w.flush();
}