/*
 * 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 <stdio.h>

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

#include "ufo-roof.h"
#include "ufo-roof-buffer.h"
#include "ufo-roof-build-task.h"


struct _UfoRoofBuildTaskPrivate {
    gchar			*config;				// ROOF configuration file name
    UfoRoofConfig               *cfg;                                   // Parsed ROOF parameters
    UfoRoofBuffer               *buf;                                   // Ring buffer for incomming UDP packet

    guint                       number;                                 // Number of datasets to read
    gboolean                    stop;                                   // Stop flag

    guint 			announced;				// For debugging

    struct timespec		last_fragment_timestamp;
};

static void ufo_task_interface_init (UfoTaskIface *iface);

G_DEFINE_TYPE_WITH_CODE (UfoRoofBuildTask, ufo_roof_build_task, UFO_TYPE_TASK_NODE,
                         G_IMPLEMENT_INTERFACE (UFO_TYPE_TASK,
                                                ufo_task_interface_init))

#define UFO_ROOF_BUILD_TASK_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), UFO_TYPE_ROOF_BUILD_TASK, UfoRoofBuildTaskPrivate))

enum {
    PROP_0,
    PROP_STOP,
    PROP_NUMBER,
    PROP_CONFIG,
    N_PROPERTIES
};

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

UfoNode *
ufo_roof_build_task_new (void)
{
    return UFO_NODE (g_object_new (UFO_TYPE_ROOF_BUILD_TASK, NULL));
}

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

    UfoRoofBuildTaskPrivate *priv = UFO_ROOF_BUILD_TASK_GET_PRIVATE (task);

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

    priv->cfg = ufo_roof_config_new(priv->config, &gerr);
    if (!priv->cfg)
        roof_propagate_error(error, gerr, "roof-build-setup: ");


    priv->buf = ufo_roof_buffer_new(priv->cfg, priv->number, &gerr);
    if (!priv->buf) 
        roof_propagate_error(error, gerr, "roof-build-setup: ");

    clock_gettime(CLOCK_REALTIME, &priv->last_fragment_timestamp);
}

static void
ufo_roof_build_task_finalize (GObject *object)
{
    UfoRoofBuildTaskPrivate *priv = UFO_ROOF_BUILD_TASK_GET_PRIVATE (object);
    
    if (priv->buf) {
        ufo_roof_buffer_free(priv->buf);
        priv->buf = NULL;
    }

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

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


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



static void
ufo_roof_build_task_get_requisition (UfoTask *task,
                                 UfoBuffer **inputs,
                                 UfoRequisition *requisition,
                                 GError **error)
{
    UfoRoofBuildTaskPrivate *priv = UFO_ROOF_BUILD_TASK_GET_PRIVATE (task);

    guint bytes = priv->cfg->dataset_size;

        // 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_build_task_get_num_inputs (UfoTask *task)
{
    return 1;
}

static guint
ufo_roof_build_task_get_num_dimensions (UfoTask *task,
                                             guint input)
{
    return 1;
}

static UfoTaskMode
ufo_roof_build_task_get_mode (UfoTask *task)
{
    return  UFO_TASK_MODE_CPU | UFO_TASK_MODE_REDUCTOR;
}

static gboolean
ufo_roof_build_task_process (UfoTask *task,
                         UfoBuffer **inputs,
                         UfoBuffer *output,
                         UfoRequisition *requisition)
{
    GError *gerr = NULL;
    
    UfoRoofBuildTaskPrivate *priv = UFO_ROOF_BUILD_TASK_GET_PRIVATE (task);
    UfoRoofConfig *cfg = priv->cfg;
    UfoRoofBuffer *buf = priv->buf;
    gboolean ready = FALSE;

//    UfoRequisition in_req;
//    ufo_buffer_get_requisition (inputs[0], &in_req);

    const uint8_t *data = (uint8_t*)ufo_buffer_get_host_array(inputs[0], NULL);
    UfoRoofPacketBlockHeader *header = UFO_ROOF_PACKET_BLOCK_HEADER(data, cfg);

    if (priv->stop)
        return FALSE;

    const uint8_t *fragment = data;
    for (guint i = 0; i < header->n_packets; i++) {
        guint packet_id = 0;

            // Otherwise considered consecutive and handled by the buffer        
        if (cfg->header_size >= sizeof(UfoRoofPacketHeader)) {
            UfoRoofPacketHeader *pheader = UFO_ROOF_PACKET_HEADER(fragment); 
            packet_id = pheader->packet_id + 1;
        }

	    // FIXME: Can we kill here the dataset finished during the previous step of iteration
        ready |= ufo_roof_buffer_set_fragment(buf, header->channel_id, packet_id, fragment + cfg->header_size, &gerr);
        if (gerr) roof_print_error(gerr);

        fragment += cfg->max_packet_size;
    }
    
    // FIXME: if 2nd dataset is ready (2nd and 3rd?), skip the first one?

    if (ready) {
	clock_gettime(CLOCK_REALTIME, &priv->last_fragment_timestamp);
    } else {
	struct timespec current_time;
	clock_gettime(CLOCK_REALTIME, &current_time);

	    // No new accepted events within timeout
        if (((current_time.tv_sec - priv->last_fragment_timestamp.tv_sec) * 1000000 +  (current_time.tv_nsec - priv->last_fragment_timestamp.tv_nsec) / 1000) > cfg->network_timeout) {
	    priv->stop = TRUE;
	    g_object_notify_by_pspec (G_OBJECT(task), properties[PROP_STOP]);
	}
    }


/*
    printf("proc (%s - %u of %u) - channel: %i, packets: %i, first dataset: %i\n", ready?"yes":" no", buf->n_fragments[(buf->current_id)%buf->ring_size], buf->fragments_per_dataset, header->channel_id, header->n_packets, 
	(cfg->header_size >= sizeof(UfoRoofPacketHeader))?UFO_ROOF_PACKET_HEADER(data)->packet_id / (cfg->dataset_size / cfg->payload_size / cfg->n_streams):0);
*/

    return !ready;
}

static gboolean
ufo_roof_build_task_generate (UfoTask *task,
                         UfoBuffer *output,
                         UfoRequisition *requisition)
{
    gboolean ready = FALSE;
    GError *gerr = NULL;
    
    UfoRoofBuildTaskPrivate *priv = UFO_ROOF_BUILD_TASK_GET_PRIVATE (task);
//    UfoRoofConfig *cfg = priv->cfg;
    UfoRoofBuffer *buf = priv->buf;

    void *output_buffer = ufo_buffer_get_host_array(output, NULL);

    if (priv->stop)
        return FALSE;

    ready = ufo_roof_buffer_get_dataset(buf, output_buffer, &gerr);
    if (gerr) roof_print_error(gerr);

	// FIXME: Or shall we start from counting from the ID of the first registerd dataset
    if ((priv->number)&&(buf->current_id >= priv->number)) {
//	printf("%u datasets processed, stopping\n", buf->current_id);
        priv->stop = TRUE;
        g_object_notify_by_pspec (G_OBJECT(task), properties[PROP_STOP]);
    }


    if ((priv->number < 100)||((buf->current_id - priv->announced) > 1000)) {
	printf("Generating dataset %i (%s), next: %u out of %u)\n", buf->current_id, ready?"yes":" no", buf->n_fragments[buf->current_id%buf->ring_size], buf->fragments_per_dataset);
	priv->announced = buf->current_id;
    }

    return ready;
}

static void
ufo_roof_build_task_set_property (GObject *object,
                              guint property_id,
                              const GValue *value,
                              GParamSpec *pspec)
{
    UfoRoofBuildTaskPrivate *priv = UFO_ROOF_BUILD_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_STOP:
            priv->stop = g_value_get_boolean (value);
            break;
        case PROP_NUMBER:
            priv->number = g_value_get_uint (value);
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
    }
}

static void
ufo_roof_build_task_get_property (GObject *object,
                              guint property_id,
                              GValue *value,
                              GParamSpec *pspec)
{
    UfoRoofBuildTaskPrivate *priv = UFO_ROOF_BUILD_TASK_GET_PRIVATE (object);

    switch (property_id) {
        case PROP_CONFIG:
	    g_value_set_string(value, priv->config);
            break;
        case PROP_STOP:
            g_value_set_boolean (value, priv->stop);
            break;
        case PROP_NUMBER:
            g_value_set_uint (value, priv->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_build_task_setup;
    iface->get_num_inputs = ufo_roof_build_task_get_num_inputs;
    iface->get_num_dimensions = ufo_roof_build_task_get_num_dimensions;
    iface->get_mode = ufo_roof_build_task_get_mode;
    iface->get_requisition = ufo_roof_build_task_get_requisition;
    iface->process = ufo_roof_build_task_process;
    iface->generate = ufo_roof_build_task_generate;
}

static void
ufo_roof_build_task_class_init (UfoRoofBuildTaskClass *klass)
{
    GObjectClass *oclass = G_OBJECT_CLASS (klass);

    oclass->set_property = ufo_roof_build_task_set_property;
    oclass->get_property = ufo_roof_build_task_get_property;
    oclass->finalize = ufo_roof_build_task_finalize;

    properties[PROP_CONFIG] =
        g_param_spec_string ("config",
            "ROOF configuration",
            "Path to ROOF configuration file",
            "",
            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_NUMBER] =
        g_param_spec_uint("number",
            "Number of datasets to receive",
            "Number of datasets to receive",
            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(UfoRoofBuildTaskPrivate));
}

static void
ufo_roof_build_task_init(UfoRoofBuildTask *self)
{
    self->priv = UFO_ROOF_BUILD_TASK_GET_PRIVATE(self);
}