/*
 * Copyright (C) 2011-2013 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-opencl-task.h"


struct _UfoOpenCLTaskPrivate {
    cl_kernel kernel;
    cl_uint n_inputs;
    gchar *filename;
    gchar *funcname;
    gchar *source;
    gchar *opts;
    guint n_dims;
};

static void ufo_task_interface_init (UfoTaskIface *iface);

G_DEFINE_TYPE_WITH_CODE (UfoOpenCLTask, ufo_opencl_task, UFO_TYPE_TASK_NODE,
                         G_IMPLEMENT_INTERFACE (UFO_TYPE_TASK,
                                                ufo_task_interface_init))

#define UFO_OPENCL_TASK_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), UFO_TYPE_OPENCL_TASK, UfoOpenCLTaskPrivate))

enum {
    PROP_0,
    PROP_FILENAME,
    PROP_SOURCE,
    PROP_KERNEL,
    PROP_OPTIONS,
    PROP_NUM_DIMS,
    N_PROPERTIES
};

static GParamSpec *properties[N_PROPERTIES] = { NULL, };

UfoNode *
ufo_opencl_task_new (void)
{
    return UFO_NODE (g_object_new (UFO_TYPE_OPENCL_TASK, NULL));
}

static gboolean
ufo_opencl_task_process (UfoTask *task,
                         UfoBuffer **inputs,
                         UfoBuffer *output,
                         UfoRequisition *requisition)
{
    UfoOpenCLTaskPrivate *priv;
    UfoGpuNode *node;
    UfoProfiler *profiler;
    cl_command_queue cmd_queue;
    cl_mem out_mem;
    UfoBufferLayout layout = UFO_BUFFER_LAYOUT_REAL;

    priv = UFO_OPENCL_TASK (task)->priv;
    node = UFO_GPU_NODE (ufo_task_node_get_proc_node (UFO_TASK_NODE (task)));
    cmd_queue = ufo_gpu_node_get_cmd_queue (node);

    for (guint i = 0; i < priv->n_inputs; i++) {
        cl_mem in_mem;
        UfoBufferLayout current;

        current = ufo_buffer_get_layout (inputs[i]);
        in_mem = ufo_buffer_get_device_array (inputs[i], cmd_queue);
        UFO_RESOURCES_CHECK_CLERR (clSetKernelArg (priv->kernel, i, sizeof (cl_mem), &in_mem));

        if (i > 0 && current != layout)
            g_warning ("Input buffer %i has different layout than %i", i, i - 1);

        layout = current;
    }

    /* reduce global work size in x-direction for complex numbers */
    if (layout == UFO_BUFFER_LAYOUT_COMPLEX_INTERLEAVED)
        requisition->dims[0] /= 2;

    out_mem = ufo_buffer_get_device_array (output, cmd_queue);
    UFO_RESOURCES_CHECK_CLERR (clSetKernelArg (priv->kernel, priv->n_inputs, sizeof (cl_mem), &out_mem));

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

    return TRUE;
}

static void
ufo_opencl_task_setup (UfoTask *task,
                       UfoResources *resources,
                       GError **error)
{
    UfoOpenCLTaskPrivate *priv;

    priv = UFO_OPENCL_TASK_GET_PRIVATE (task);

    if (priv->funcname == NULL) {
        g_set_error (error, UFO_TASK_ERROR, UFO_TASK_ERROR_SETUP,
                     "Must specify a ::kernel name to use for operation");
        return;

    }

    if (priv->filename != NULL && priv->source != NULL) {
        g_set_error (error, UFO_TASK_ERROR, UFO_TASK_ERROR_SETUP,
                     "Cannot use ::filename and ::source at the same time");
        return;
    }

    if (priv->source != NULL) {
        priv->kernel = ufo_resources_get_kernel_from_source (resources, priv->source, priv->funcname, priv->opts, error);
    }
    else {
        const gchar *filename;

        filename = priv->filename != NULL ? priv->filename : "opencl.cl";
        priv->kernel = ufo_resources_get_kernel (resources, filename, priv->funcname, priv->opts, error);
    }

    if (priv->kernel != NULL) {
        cl_uint n_args;

        UFO_RESOURCES_CHECK_SET_AND_RETURN (clGetKernelInfo (priv->kernel,
                                                             CL_KERNEL_NUM_ARGS,
                                                             sizeof (cl_uint),
                                                             &n_args, NULL),
                                            error);

        if (n_args < 2) {
            g_set_error (error, UFO_TASK_ERROR, UFO_TASK_ERROR_SETUP,
                         "Kernel `%s' must accept at least two arguments",
                         priv->funcname);
            return;
        }

        priv->n_inputs = n_args - 1;
        UFO_RESOURCES_CHECK_SET_AND_RETURN (clRetainKernel (priv->kernel), error);
    }
}

static void
ufo_opencl_task_get_requisition (UfoTask *task,
                                 UfoBuffer **inputs,
                                 UfoRequisition *requisition,
                                 GError **error)
{
    ufo_buffer_get_requisition (inputs[0], requisition);
}

static guint
ufo_opencl_task_get_num_inputs (UfoTask *task)
{
    return UFO_OPENCL_TASK_GET_PRIVATE (task)->n_inputs;
}

static guint
ufo_opencl_task_get_num_dimensions (UfoTask *task,
                                    guint input)
{
    return UFO_OPENCL_TASK_GET_PRIVATE (task)->n_dims;
}

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

static UfoNode *
ufo_opencl_task_copy_real (UfoNode *node,
                           GError **error)
{
    UfoOpenCLTask *orig;
    UfoOpenCLTask *copy;

    orig = UFO_OPENCL_TASK (node);
    copy = UFO_OPENCL_TASK (ufo_opencl_task_new ());
    copy->priv->n_inputs = orig->priv->n_inputs;

    g_object_set (G_OBJECT (copy),
                  "filename", orig->priv->filename,
                  "source", orig->priv->source,
                  "kernel", orig->priv->funcname,
                  "options", orig->priv->opts,
                  "dimensions", orig->priv->n_dims,
                  NULL);

    return UFO_NODE (copy);
}

static gboolean
ufo_opencl_task_equal_real (UfoNode *n1,
                            UfoNode *n2)
{
    g_return_val_if_fail (UFO_IS_OPENCL_TASK (n1) && UFO_IS_OPENCL_TASK (n2), FALSE);
    return UFO_OPENCL_TASK (n1)->priv->kernel == UFO_OPENCL_TASK (n2)->priv->kernel;
}

static void
ufo_opencl_task_finalize (GObject *object)
{
    UfoOpenCLTaskPrivate *priv;

    priv = UFO_OPENCL_TASK_GET_PRIVATE (object);

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

    g_free (priv->filename);
    g_free (priv->funcname);
    g_free (priv->opts);

    priv->filename = NULL;
    priv->funcname = NULL;
    priv->opts = NULL;
}

static void
ufo_task_interface_init (UfoTaskIface *iface)
{
    iface->setup = ufo_opencl_task_setup;
    iface->get_requisition = ufo_opencl_task_get_requisition;
    iface->get_num_inputs = ufo_opencl_task_get_num_inputs;
    iface->get_num_dimensions = ufo_opencl_task_get_num_dimensions;
    iface->get_mode = ufo_opencl_task_get_mode;
    iface->process = ufo_opencl_task_process;
}

static void
ufo_opencl_task_set_property (GObject *object,
                              guint property_id,
                              const GValue *value,
                              GParamSpec *pspec)
{
    UfoOpenCLTaskPrivate *priv = UFO_OPENCL_TASK_GET_PRIVATE (object);

    switch (property_id) {
        case PROP_FILENAME:
            g_free (priv->filename);
            priv->filename = g_value_dup_string (value);
            break;
        case PROP_SOURCE:
            g_free (priv->source);
            priv->source = g_value_dup_string (value);
            break;
        case PROP_KERNEL:
            g_free (priv->funcname);
            priv->funcname = g_value_dup_string (value);
            break;
        case PROP_OPTIONS:
            g_free (priv->opts);
            priv->opts = g_value_dup_string (value);
            break;
        case PROP_NUM_DIMS:
            priv->n_dims = g_value_get_uint (value);
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
    }
}

static void
ufo_opencl_task_get_property (GObject *object,
                              guint property_id,
                              GValue *value,
                              GParamSpec *pspec)
{
    UfoOpenCLTaskPrivate *priv = UFO_OPENCL_TASK_GET_PRIVATE (object);

    switch (property_id) {
        case PROP_FILENAME:
            g_value_set_string (value, priv->filename ? priv->filename : "");
            break;
        case PROP_SOURCE:
            g_value_set_string (value, priv->source ? priv->source : "");
            break;
        case PROP_KERNEL:
            g_value_set_string (value, priv->funcname ? priv->funcname : "");
            break;
        case PROP_OPTIONS:
            g_value_set_string (value, priv->opts);
            break;
        case PROP_NUM_DIMS:
            g_value_set_uint (value, priv->n_dims);
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
            break;
    }
}

static void
ufo_opencl_task_class_init (UfoOpenCLTaskClass *klass)
{
    GObjectClass *oclass;
    UfoNodeClass *node_class;
    
    oclass = G_OBJECT_CLASS (klass);
    node_class = UFO_NODE_CLASS (klass);

    oclass->finalize = ufo_opencl_task_finalize;
    oclass->set_property = ufo_opencl_task_set_property;
    oclass->get_property = ufo_opencl_task_get_property;

    properties[PROP_FILENAME] =
        g_param_spec_string ("filename",
            "OpenCL kernel filename",
            "OpenCL kernel filename",
            "",
            G_PARAM_READWRITE);

    properties[PROP_SOURCE] =
        g_param_spec_string ("source",
            "OpenCL kernel source",
            "OpenCL kernel source",
            "",
            G_PARAM_READWRITE);

    properties[PROP_KERNEL] =
        g_param_spec_string ("kernel",
            "Kernel name",
            "Name of the kernel that should be computed with this task",
            "",
            G_PARAM_READWRITE);

    properties[PROP_OPTIONS] =
        g_param_spec_string ("options",
            "OpenCL build options",
            "OpenCL build options",
            "",
            G_PARAM_READWRITE);

    properties[PROP_NUM_DIMS] = 
        g_param_spec_uint ("dimensions",
            "Number of dimensions",
            "Number of dimensions that the kernel works on",
            1, 3, 2,
            G_PARAM_READWRITE);

    for (guint i = PROP_0 + 1; i < N_PROPERTIES; i++)
        g_object_class_install_property (oclass, i, properties[i]);

    node_class->copy = ufo_opencl_task_copy_real;
    node_class->equal = ufo_opencl_task_equal_real;

    g_type_class_add_private(klass, sizeof(UfoOpenCLTaskPrivate));
}

static void
ufo_opencl_task_init (UfoOpenCLTask *self)
{
    UfoOpenCLTaskPrivate *priv;
    self->priv = priv = UFO_OPENCL_TASK_GET_PRIVATE (self);
    priv->kernel = NULL;
    priv->filename = NULL;
    priv->funcname = NULL;
    priv->source = NULL;
    priv->opts = g_strdup ("");
    priv->n_dims = 2;
    priv->n_inputs = 1;
}