// 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) {
		index  = wapp_array_alloc_capacity(i32, allocator, capacity, ARRAY_INIT_FILLED);
		values = wapp_array_alloc_capacity(T, allocator, capacity, ARRAY_INIT_NONE);

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

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

		i32 idx = (i32)wapp_array_count(values);
		wapp_array_set(i32, index, id.index, &idx);
		wapp_array_append_capped(T, values, &prop);
	}

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

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

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

		// Update index
		index[id.index] = -1;

		i64 entity_index = -1;
		for (u64 i = 0; i < wapp_array_count(index); ++i) {
			if (index[i] == idx2) {
				entity_index = (i64)i;
				break;
			}
		}

		if (entity_index != -1) {
			index[entity_index] = idx1;
		}
	}

	// private:
		typedef T *TArray;

		I32Array index;
		TArray values;
};

#endif // !PROP_TABLE_H