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/*
 * 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/>.
 */

#define _GNU_SOURCE

#include <stdio.h>

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

#include "ufo-roof.h"
#include "ufo-roof-read-socket.h"
#include "ufo-roof-read-file.h"
#include "ufo-roof-read-task.h"

struct _UfoRoofReadTaskPrivate {
    gchar			*config;				// ROOF configuration file name
    UfoRoofConfig               *cfg;                                   // Parsed ROOF parameters
    UfoRoofReadInterface        *reader;

    guint                       id;                                     // Reader ID (defince sequential port number)
    gboolean                    stop;                                   // Flag requiring termination
    gboolean                    simulate;                               // Indicates if we are running in network or simulation modes
    gchar                       *path;                                  // UFO file path for simulation mode
    guint                       first_file_number;                      // Number of a first simulated file (0 or 1)
};

static void ufo_task_interface_init (UfoTaskIface *iface);

G_DEFINE_TYPE_WITH_CODE (UfoRoofReadTask, ufo_roof_read_task, UFO_TYPE_TASK_NODE,
                         G_IMPLEMENT_INTERFACE (UFO_TYPE_TASK,
                                                ufo_task_interface_init))

#define UFO_ROOF_READ_TASK_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), UFO_TYPE_ROOF_READ_TASK, UfoRoofReadTaskPrivate))

enum {
    PROP_0,
    PROP_ID,
    PROP_STOP,
    PROP_CONFIG,
    PROP_SIMULATE,
    PROP_PATH,
    PROP_FIRST,
    N_PROPERTIES
};

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

UfoNode *
ufo_roof_read_task_new (void)
{
    return UFO_NODE (g_object_new (UFO_TYPE_ROOF_READ_TASK, NULL));
}

static void
ufo_roof_read_task_setup (UfoTask *task,
                       UfoResources *resources,
                       GError **error)
{
    GError *gerr = NULL;

    UfoRoofReadTaskPrivate *priv = UFO_ROOF_READ_TASK_GET_PRIVATE (task);

    if (!priv->config)
        roof_setup_error(error, "ROOF configuration is not specified");

    priv->cfg = ufo_roof_config_new(priv->config, priv->simulate?UFO_ROOF_CONFIG_SIMULATION:UFO_ROOF_CONFIG_DEFAULT, &gerr);
    if (!priv->cfg) roof_propagate_error(error, gerr, "roof_config_new: ");

        // Consistency checks
    if (priv->id >= priv->cfg->n_streams)
        roof_setup_error(error, "Specified Stream ID is %u, but only %u data streams is configured", priv->id, priv->cfg->n_streams);

        // Start actual reader
    if (priv->simulate) {
        if (!priv->path)
            roof_setup_error(error, "Path to simulated data should be specified");
    
        priv->reader = ufo_roof_read_file_new(priv->cfg, priv->path, priv->id + priv->first_file_number, &gerr);
    } else
        priv->reader = ufo_roof_read_socket_new(priv->cfg, priv->id, &gerr);

    if (!priv->reader) 
        roof_propagate_error(error, gerr, "roof_read_new: ");

}


static void
ufo_roof_read_task_finalize (GObject *object)
{
    UfoRoofReadTaskPrivate *priv = UFO_ROOF_READ_TASK_GET_PRIVATE (object);

    if (priv->reader) {
        priv->reader->close(priv->reader);
    }
    
    if (priv->cfg) {
        ufo_roof_config_free(priv->cfg);
        priv->cfg = NULL;        
    }

    if (priv->config) {
	g_free(priv->config);
	priv->config = NULL;
    }

    if (priv->path) {
	g_free(priv->path);
	priv->path = NULL;
    }

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

static void
ufo_roof_read_task_get_requisition (UfoTask *task,
                                 UfoBuffer **inputs,
                                 UfoRequisition *requisition,
                                 GError **error)
{
    UfoRoofReadTaskPrivate *priv = UFO_ROOF_READ_TASK_GET_PRIVATE (task);
    UfoRoofConfig *cfg = priv->cfg;

    guint bytes = cfg->max_packets * cfg->max_packet_size + sizeof(UfoRoofPacketBlockHeader);
    
        // FIXME: Can this be made more elegant?
    requisition->n_dims = 1;
    requisition->dims[0] = bytes / sizeof(float) + ((bytes%sizeof(float))?1:0);
}

static guint
ufo_roof_read_task_get_num_inputs (UfoTask *task)
{
    return 0;
}

static guint
ufo_roof_read_task_get_num_dimensions (UfoTask *task,
                                             guint input)
{
    return 0;
}

static UfoTaskMode
ufo_roof_read_task_get_mode (UfoTask *task)
{
    return UFO_TASK_MODE_CPU | UFO_TASK_MODE_GENERATOR;
}


static gboolean
ufo_roof_read_task_generate (UfoTask *task,
                         UfoBuffer *output,
                         UfoRequisition *requisition)
{
    GError *gerr = NULL;
    UfoRoofReadTaskPrivate *priv = UFO_ROOF_READ_TASK_GET_PRIVATE (task);
    UfoRoofConfig *cfg = priv->cfg;

    void *output_buffer = ufo_buffer_get_host_array(output, NULL);
    UfoRoofPacketBlockHeader *header = UFO_ROOF_PACKET_BLOCK_HEADER(output_buffer, cfg);

    if (priv->stop)
        return FALSE;

    guint packets = priv->reader->read(priv->reader, output_buffer, &gerr);
    if (gerr) {
        g_warning("Error reciving data: %s", gerr->message);
        g_error_free(gerr);
        return FALSE;
    }

#ifdef UFO_ROOF_DEBUG
	// Store first received packet on each channel...
    static int debug = 1;
    if (debug) {
        char fname[256];
        sprintf(fname, "channel%i_packet0.raw", priv->id);
        FILE *f = fopen(fname, "w");
        if (f) {
            fwrite(output_buffer, 1, cfg->max_packets * cfg->max_packet_size, f);
            fclose(f);
        }
        debug = 0;
    }
#endif /* UFO_ROOF_DEBUG */

        // FIXME: End of data (shall we restart in the network case?)
    if (!packets)
        return FALSE;

        // Shall I use UFO metadata (ufo_buffer_set_metadata) insead?
    header->channel_id = priv->id;
    header->n_packets = packets;
    
    return TRUE;
}

static void
ufo_roof_read_task_set_property (GObject *object,
                              guint property_id,
                              const GValue *value,
                              GParamSpec *pspec)
{
    UfoRoofReadTaskPrivate *priv = UFO_ROOF_READ_TASK_GET_PRIVATE (object);

    switch (property_id) {
        case PROP_CONFIG:
	    if (priv->config) g_free(priv->config);
	    priv->config = g_value_dup_string(value);
            break;
        case PROP_ID:
            priv->id = g_value_get_uint (value);
            break;
        case PROP_STOP:
            priv->stop = g_value_get_boolean (value);
            break;
        case PROP_SIMULATE:
            priv->simulate = g_value_get_boolean (value);
            break;
        case PROP_PATH:
	    if (priv->path) g_free(priv->path);
	    priv->path = g_value_dup_string(value);
            break;
        case PROP_FIRST:
            priv->first_file_number = g_value_get_uint (value);
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
    }
}

static void
ufo_roof_read_task_get_property (GObject *object,
                              guint property_id,
                              GValue *value,
                              GParamSpec *pspec)
{
    UfoRoofReadTaskPrivate *priv = UFO_ROOF_READ_TASK_GET_PRIVATE (object);

    switch (property_id) {
        case PROP_CONFIG:
	    g_value_set_string(value, priv->config);
            break;
        case PROP_ID:
            g_value_set_uint (value, priv->id);
            break;
        case PROP_STOP:
            g_value_set_boolean (value, priv->stop);
            break;
        case PROP_SIMULATE:
            g_value_set_boolean (value, priv->simulate);
            break;
        case PROP_PATH:
	    g_value_set_string(value, priv->path?priv->path:"");
            break;
        case PROP_FIRST:
            g_value_set_uint (value, priv->first_file_number);
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
    }
}

static void
ufo_task_interface_init (UfoTaskIface *iface)
{
    iface->setup = ufo_roof_read_task_setup;
    iface->get_num_inputs = ufo_roof_read_task_get_num_inputs;
    iface->get_num_dimensions = ufo_roof_read_task_get_num_dimensions;
    iface->get_mode = ufo_roof_read_task_get_mode;
    iface->get_requisition = ufo_roof_read_task_get_requisition;
    iface->generate = ufo_roof_read_task_generate;
}

static void
ufo_roof_read_task_class_init (UfoRoofReadTaskClass *klass)
{
    GObjectClass *oclass = G_OBJECT_CLASS (klass);

    oclass->set_property = ufo_roof_read_task_set_property;
    oclass->get_property = ufo_roof_read_task_get_property;
    oclass->finalize = ufo_roof_read_task_finalize;

    properties[PROP_CONFIG] =
        g_param_spec_string ("config",
            "ROOF configuration",
            "Path to ROOF configuration file",
            "",
            G_PARAM_READWRITE);

    properties[PROP_ID] =
        g_param_spec_uint ("id",
            "Reader ID",
            "ID for multi-port servers",
            0, G_MAXUINT, 1,
            G_PARAM_READWRITE);

    properties[PROP_STOP] =
        g_param_spec_boolean ("stop",
            "Stop flag",
            "Stop socket servers and terminates filter execution",
            FALSE,
            G_PARAM_READWRITE);

    properties[PROP_SIMULATE] =
        g_param_spec_boolean ("simulate",
            "Simulation mode",
            "Read data from the specified files instead of network",
            FALSE,
            G_PARAM_READWRITE);

    properties[PROP_PATH] =
        g_param_spec_string ("path",
            "Input files for simulation mode",
            "Optional path to input files for simulation mode (parameter from configuration file is used if not specified)",
            "",
            G_PARAM_READWRITE);

    properties[PROP_FIRST] =
        g_param_spec_uint ("first_file_number",
            "Offset to the first read file",
            "Offset to the first read file",
            0, G_MAXUINT, 0,
            G_PARAM_READWRITE);

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

    g_type_class_add_private (oclass, sizeof(UfoRoofReadTaskPrivate));
}

static void
ufo_roof_read_task_init(UfoRoofReadTask *self)
{
    self->priv = UFO_ROOF_READ_TASK_GET_PRIVATE(self);
}