/*
 * Copyright (C) 2011-2015 Karlsruhe Institute of Technology
 *
 * This file is part of Ufo.
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "config.h"

#ifdef __APPLE__
#include <OpenCL/cl.h>
#else
#include <CL/cl.h>
#endif

#include "ufo-power-spectrum-task.h"


struct _UfoPowerSpectrumTaskPrivate {
    cl_kernel kernel;
};

static void ufo_task_interface_init (UfoTaskIface *iface);

G_DEFINE_TYPE_WITH_CODE (UfoPowerSpectrumTask, ufo_power_spectrum_task, UFO_TYPE_TASK_NODE,
                         G_IMPLEMENT_INTERFACE (UFO_TYPE_TASK,
                                                ufo_task_interface_init))

#define UFO_POWER_SPECTRUM_TASK_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), UFO_TYPE_POWER_SPECTRUM_TASK, UfoPowerSpectrumTaskPrivate))

UfoNode *
ufo_power_spectrum_task_new (void)
{
    return UFO_NODE (g_object_new (UFO_TYPE_POWER_SPECTRUM_TASK, NULL));
}

static void
ufo_power_spectrum_task_setup (UfoTask *task,
                               UfoResources *resources,
                               GError **error)
{
    UfoPowerSpectrumTaskPrivate *priv;

    priv = UFO_POWER_SPECTRUM_TASK_GET_PRIVATE (task);
    priv->kernel = ufo_resources_get_kernel (resources, "complex.cl", "c_abs_squared", NULL, error);
    if (priv->kernel != NULL) {
        UFO_RESOURCES_CHECK_SET_AND_RETURN (clRetainKernel (priv->kernel), error);
    }
}

static void
ufo_power_spectrum_task_get_requisition (UfoTask *task,
                                         UfoBuffer **inputs,
                                         UfoRequisition *requisition,
                                         GError **error)
{
    UfoBufferLayout layout = ufo_buffer_get_layout (inputs[0]);

    if (layout != UFO_BUFFER_LAYOUT_COMPLEX_INTERLEAVED) {
        g_warning ("Input is not complex");
    }
    ufo_buffer_get_requisition (inputs[0], requisition);
    requisition->dims[0] /= 2;
}

static guint
ufo_power_spectrum_task_get_num_inputs (UfoTask *task)
{
    return 1;
}

static guint
ufo_power_spectrum_task_get_num_dimensions (UfoTask *task,
                                            guint input)
{
    return 2;
}

static UfoTaskMode
ufo_power_spectrum_task_get_mode (UfoTask *task)
{
    return UFO_TASK_MODE_PROCESSOR | UFO_TASK_MODE_GPU;
}

static gboolean
ufo_power_spectrum_task_equal_real (UfoNode *n1,
                                    UfoNode *n2)
{
    g_return_val_if_fail (UFO_IS_POWER_SPECTRUM_TASK (n1) && UFO_IS_POWER_SPECTRUM_TASK (n2), FALSE);

    return UFO_POWER_SPECTRUM_TASK (n1)->priv->kernel == UFO_POWER_SPECTRUM_TASK (n2)->priv->kernel;
}

static gboolean
ufo_power_spectrum_task_process (UfoTask *task,
                                 UfoBuffer **inputs,
                                 UfoBuffer *output,
                                 UfoRequisition *requisition)
{
    UfoPowerSpectrumTaskPrivate *priv;
    UfoGpuNode *node;
    UfoProfiler *profiler;
    cl_command_queue cmd_queue;
    cl_mem in_mem, out_mem;

    priv = UFO_POWER_SPECTRUM_TASK_GET_PRIVATE (task);
    node = UFO_GPU_NODE (ufo_task_node_get_proc_node (UFO_TASK_NODE(task)));
    cmd_queue = ufo_gpu_node_get_cmd_queue (node);
    in_mem = ufo_buffer_get_device_array (inputs[0], cmd_queue);
    out_mem = ufo_buffer_get_device_array (output, cmd_queue);

    UFO_RESOURCES_CHECK_CLERR (clSetKernelArg (priv->kernel, 0, sizeof (cl_mem), &in_mem));
    UFO_RESOURCES_CHECK_CLERR (clSetKernelArg (priv->kernel, 1, sizeof (cl_mem), &out_mem));

    profiler = ufo_task_node_get_profiler (UFO_TASK_NODE (task));
    ufo_profiler_call (profiler, cmd_queue, priv->kernel, 2, requisition->dims, NULL);

    return TRUE;
}

static void
ufo_power_spectrum_task_finalize (GObject *object)
{
    UfoPowerSpectrumTaskPrivate *priv;

    priv = UFO_POWER_SPECTRUM_TASK_GET_PRIVATE (object);

    if (priv->kernel) {
        UFO_RESOURCES_CHECK_CLERR (clReleaseKernel (priv->kernel));
        priv->kernel = NULL;
    }

    G_OBJECT_CLASS (ufo_power_spectrum_task_parent_class)->finalize (object);
}

static void
ufo_task_interface_init (UfoTaskIface *iface)
{
    iface->setup = ufo_power_spectrum_task_setup;
    iface->get_num_inputs = ufo_power_spectrum_task_get_num_inputs;
    iface->get_num_dimensions = ufo_power_spectrum_task_get_num_dimensions;
    iface->get_mode = ufo_power_spectrum_task_get_mode;
    iface->get_requisition = ufo_power_spectrum_task_get_requisition;
    iface->process = ufo_power_spectrum_task_process;
}

static void
ufo_power_spectrum_task_class_init (UfoPowerSpectrumTaskClass *klass)
{
    GObjectClass *oclass = G_OBJECT_CLASS (klass);
    UfoNodeClass *node_class = UFO_NODE_CLASS (klass);

    oclass->finalize = ufo_power_spectrum_task_finalize;
    node_class->equal = ufo_power_spectrum_task_equal_real;

    g_type_class_add_private (oclass, sizeof(UfoPowerSpectrumTaskPrivate));
}

static void
ufo_power_spectrum_task_init(UfoPowerSpectrumTask *self)
{
    self->priv = UFO_POWER_SPECTRUM_TASK_GET_PRIVATE(self);
    self->priv->kernel = NULL;
}