// vim:fileencoding=utf-8:foldmethod=marker

#ifndef PROP_TABLE_H
#define PROP_TABLE_H

#include "entity_id.h"
#include "wapp/wapp.h"

template<typename T>
struct PropTable {
	PropTable(const Allocator *allocator, u64 capacity) {
		lookup  = wapp_array_alloc_capacity(i32, allocator, capacity, ARRAY_INIT_FILLED);
		values = wapp_array_alloc_capacity(Value, allocator, capacity, ARRAY_INIT_NONE);

		for (u64 i = 0; i < wapp_array_count(lookup); ++i) {
			lookup[i] = -1;
		}
	}

	void add_prop(EntityID id, T prop) {
		if (IS_INVALID_ID(id)) { return; }

		i32 idx = (i32)wapp_array_count(values);
		Value v = {prop, id.index};
		wapp_array_set(i32, lookup, id.index, &idx);
		wapp_array_append_capped(Value, values, &v);
	}

	void remove_prop(EntityID id) {
		if (IS_INVALID_ID(id) || *wapp_array_get(i32, lookup, id.index) == -1) { return; }

		// Get indices for swapping
		i32 idx1 = *wapp_array_get(i32, lookup, id.index);
		i32 idx2 = ((i32)wapp_array_count(values)) - 1;

		// Swap values
		values[idx1] = values[idx2];
		wapp_array_pop(Value, values);

		// Update index
		lookup[id.index] = -1;
		lookup[values[idx1].index] = idx1;
	}

	struct Value {
		T value;
		u32 index;
	};

	typedef Value *ValueArray;

	I32Array lookup;
	ValueArray values;
};

#endif // !PROP_TABLE_H