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#include <iostream>

#include <GEL/Util/ResourceManager.h>

using namespace std;

using namespace Util;

struct Blob

{

	double x;

	int step(int iter)

	{

		x += .5 / ( (iter-.75)*(iter-.25) );

		return 0;

	}

	~Blob() {cout << "Blob destroyed" << endl;}

};

double x=0;

int step(int iter)

{

	x += .5 / ( (iter-.75)*(iter-.25) );				

	return 0;

}

int (*step_fun)(int) = step;

ResourcePtr<Blob> g_ptr;

int main()

{

 	Blob b;

 	b.x = 312312;

	// Test 1: Register resource and verify that there is 1 resource

	register_static_resource<Blob>("myblob", &b);

	cout << "no resources (1) " << get_no_resources<Blob>() << endl;

	// Test 1.1: In debug mode, uncommenting the line below will make the 

	// program fail since a static resource cannot be removed by calling 

	// delete. In release mode, calling this function on a static resource

	// has no effect.

	// get_resource_ptr<Blob>("myblob").remove_when_unused();

	// Test 2:

	// Create a new resources and mark it as "remove when unused".

	// it goes away immediately since nothing points to it.

	cout << "Should print \"Blob destroyed\" below " << endl;

	register_dynamic_resource<Blob>("myblob2", new Blob).remove_when_unused();

	cout << "no resources (still 1) " << get_no_resources<Blob>() << endl;

	// Test 3:

	// Create a new resource and get a ResourcePointer. Mark as remove

	// when unused and verify that it goes away when ResourcePtr 

	// overwritten by a null resource pointer.

	ResourcePtr<Blob> b_ptr_x = register_dynamic_resource<Blob>("myblob3", new Blob);

	b_ptr_x.remove_when_unused();

	{

		ResourcePtr<Blob> gni;

		cout << "Should print \"Blob destroyed\" below " << endl;

		b_ptr_x = gni;

	}

	cout << "no resources (still 1) " << get_no_resources<Blob>() << endl;

	// Test 4:

	// Print value to ascertain the pointer is valid

	ResourcePtr<Blob> b_ptr = get_resource_ptr<Blob>("myblob");

	cout << "Value should be " << b.x << " : " << (b_ptr->x) << endl;

	// Test 5:

	// Print usage count

	cout << "Usage count (should be 1) " << b_ptr.usage() << endl;

	// Test 6:

	// Test that assigning to a new ResourcePtr increases usage count

	ResourcePtr<Blob> b_ptr2;

	b_ptr2 = get_resource_ptr<Blob>("myblob");

	cout << "Usage count (should be 2) : " << b_ptr.usage() << endl;

	// Test 7:

	// Create a local ResourcePtr

	{

		ResourcePtr<Blob> b_ptr3 = b_ptr;

		cout << "Usage count (should be 3) : " << b_ptr.usage() << endl;

	}

	// Test 8:

	// Test copy constructor

 	ResourcePtr<Blob> b_ptr4(b_ptr);

	cout << "Usage count (should be 3) : " << b_ptr.usage() << endl;

	// Test 9:

	// Get and throw away a resource ptr to test that usage is not increased.

	get_resource_ptr<Blob>("myblob");

	cout << "Usage count (should be 3) : " << b_ptr.usage() << endl;

	// Test 10:

	// Get raw pointer

	Blob* blob_raw_ptr = get_resource_ptr<Blob>("myblob").get_raw_ptr();

	cout << "Access with raw pointer " << blob_raw_ptr->x << endl;

	cout << "Usage count (should be 3) : " << b_ptr.usage() << endl;

	// --------------

	Blob b2;

	b2.x = 666;

 	register_static_resource<Blob>("my other blob", &b2);

	// Test 10:

	// Assign another resource to b_ptr4, check that usage count decreases

 	b_ptr4 = get_resource_ptr<Blob>("my other blob");

	cout << "Usage count (should be 2) : " << b_ptr.usage() << endl;

	cout << "Usage count (should be 1) : " << b_ptr4.usage() << endl;

	// Test 11:

	// Check that self assignment does not do anything

	b_ptr4 = b_ptr4;

	cout << "Usage count (should be 1) : " << b_ptr4.usage() << endl;

	// Test 12:

	// Assign the null resource ptr

 	ResourcePtr<Blob> gni;

	cout << "Usage count for 0 resource (should be -1) : " << gni.usage() 

			 << endl;

	// Test 13:

	// Test that overwriting a resource ptr with a new resource ptr to the

	// same resource does not increase usage count.

 	b_ptr4 = get_resource_ptr<Blob>("my other blob");

	cout << "Usage count (should be 1) : " << b_ptr4.usage() << endl;

	// Test 14:

	// Efficiency test. This test just computes an approximation of pi

	// using a function in a resource.

	b_ptr4->x = 0;

	for(int i=1;i<5000000;++i)

		{

			b_ptr4->step(i);

		}

	cout << " PI " << b_ptr4->x << endl;

// 	x = 0;

// 	for(int i=1;i<500000000;++i)

// 		{

// 			step(i);

// 		}

// 	cout << " PI " << x << endl;

	// Test 15: 

	// Global resource ptr test. If the relinquish line is commented out,

	// the program will give a warning upon termination and fail in debug

	// mode.

	g_ptr = b_ptr4;

	g_ptr.relinquish_resource();

	// At the end of the program, the two local blobs are destroyed.

	cout << "Two Blobs are now destroyed " << endl;

}