package component:witguest;

interface math {
    record vec3 {
        x: f32,
        y: f32,
        z: f32,
    }
}

interface ecs {
    //use math.{vec3};

    record entity-id {
        id: u64,
    }

    record entity {
        id: entity-id,
        generation: u64,
    }

    record wasm-type-id {
        inner: tuple<u64, u64>,
    }

    record component-info {
        size: u64,
        alignment: u64,
        type-id: wasm-type-id, // a u128
    }

    resource ecs-dynamic-view {
        constructor(wrld: borrow<ecs-world>, component-infos: list<component-info>);

        next: func() -> option<list<u8>>;
    }

    resource ecs-world {
        constructor();

        // expects components to be tightly packed in the same order of component-infos
        spawn: func(components: list<u8>, component-infos: list<component-info>) -> entity;
        view: func(component-infos: list<component-info>) -> ecs-dynamic-view;
    }
}

/// An example world for the component to target.
world example {
    import math;
    import ecs;

    import host-print: func(msg: string);
    export on-init: func() -> result<u8>;
}