/*
 * 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 <gmodule.h>
#include <stdio.h>

#include "ufo-edf-3d-writer-task.h"

/**
 * SECTION:ufo-edf-3d-writer-task
 * @Short_description: Write 3D EDF files
 * @Title: edf-3d-writer
 */

struct _UfoEdf3dWriterTaskPrivate {
    gchar *filename;
    gchar *template;
    guint counter;
};

static void ufo_task_interface_init (UfoTaskIface *iface);

G_DEFINE_TYPE_WITH_CODE (UfoEdf3dWriterTask, ufo_edf_3d_writer_task, UFO_TYPE_TASK_NODE,
                         G_IMPLEMENT_INTERFACE (UFO_TYPE_TASK,
                                                ufo_task_interface_init))

#define UFO_EDF_3D_WRITER_TASK_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), UFO_TYPE_EDF_3D_WRITER_TASK, UfoEdf3dWriterTaskPrivate))

enum {
    PROP_0,
    PROP_FILENAME,
    N_PROPERTIES
};

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

UfoNode *
ufo_edf_3d_writer_task_new (void)
{
    return UFO_NODE (g_object_new (UFO_TYPE_EDF_3D_WRITER_TASK, NULL));
}

static gchar *
build_template (const gchar *format)
{
    gchar *template;
    gchar *percent;

    template = g_strdup (format);
    percent = g_strstr_len (template, -1, "%");

    if (percent != NULL) {
        percent++;

        while (*percent) {
            if (*percent == '%')
                *percent = '_';
            percent++;
        }
    }
    else {
        g_warning ("Specifier %%i not found. Appending it.");
        g_free (template);
        template = g_strconcat (format, "%i", NULL);
    }

    return template;
}

static void
ufo_edf_3d_writer_task_setup (UfoTask *task,
                       UfoResources *resources,
                       GError **error)
{
    UfoEdf3dWriterTaskPrivate *priv;

    priv = UFO_EDF_3D_WRITER_TASK_GET_PRIVATE (task);
    priv->template = build_template (priv->filename);
}

static void
ufo_edf_3d_writer_task_get_requisition (UfoTask *task,
                                        UfoBuffer **inputs,
                                        UfoRequisition *requisition)
{
    requisition->n_dims = 0;
}

static guint
ufo_edf_3d_writer_task_get_num_inputs (UfoTask *task)
{
    return 1;
}

static guint
ufo_edf_3d_writer_task_get_num_dimensions (UfoTask *task,
                                           guint input)
{
    g_return_val_if_fail (input == 0, 0);
    return 3;
}

static UfoTaskMode
ufo_edf_3d_writer_task_get_mode (UfoTask *task)
{
    return UFO_TASK_MODE_PROCESSOR | UFO_TASK_MODE_CPU;
}

static gboolean
write_header (FILE *fp, UfoBuffer *buffer)
{
    UfoRequisition req;
    gchar *header;
    const gsize length = 512;
    gboolean result = TRUE;

    ufo_buffer_get_requisition (buffer, &req);
    header = g_strnfill (length, ' ');
    
    g_snprintf (header, length,
                "{\nByteOrder = LowByteFirst;\nDataType = FloatValue;\nDim_1 = %zu;\nDim_2 = %zu;\nDim_3 = %zu;\nSize = %zu;\n",
                req.dims[0], req.dims[1], req.dims[2],
                req.dims[0] * req.dims[1] * req.dims[2] * sizeof(gfloat));

    header[510] = '}';
    header[511] = '\x0A';

    result = fwrite (header, sizeof(gchar), length, fp) == length;
    g_free (header);
    return result;
}

static gboolean
write_body (FILE *fp, UfoBuffer *buffer)
{
    gfloat *data;
    gsize size;

    data = ufo_buffer_get_host_array (buffer, NULL);
    size = ufo_buffer_get_size (buffer);
    return fwrite (data, 1, size, fp) == size;
}

static gboolean
ufo_edf_3d_writer_task_process (UfoTask *task,
                         UfoBuffer **inputs,
                         UfoBuffer *output,
                         UfoRequisition *requisition)
{
    UfoEdf3dWriterTaskPrivate *priv;
    UfoProfiler *profiler;
    gchar *filename;
    FILE *fp;

    priv = UFO_EDF_3D_WRITER_TASK_GET_PRIVATE (UFO_EDF_3D_WRITER_TASK (task));
    profiler = ufo_task_node_get_profiler (UFO_TASK_NODE (task));
    filename = g_strdup_printf (priv->template, priv->counter);

    ufo_profiler_start (profiler, UFO_PROFILER_TIMER_IO);
    fp = fopen (filename, "wb");

    if (!write_header (fp, inputs[0]))
        goto error_cleanup;

    if (!write_body (fp, inputs[0]))
        goto error_cleanup;

    fclose (fp);
    ufo_profiler_stop (profiler, UFO_PROFILER_TIMER_IO);

    g_free (filename);
    priv->counter++;
    return TRUE;

error_cleanup:
    g_warning ("Could not write EDF data");
    fclose (fp);
    g_free (filename);
    return FALSE;
}

static void
ufo_edf_3d_writer_task_set_property (GObject *object,
                              guint property_id,
                              const GValue *value,
                              GParamSpec *pspec)
{
    UfoEdf3dWriterTaskPrivate *priv = UFO_EDF_3D_WRITER_TASK_GET_PRIVATE (object);

    switch (property_id) {
        case PROP_FILENAME:
            g_free (priv->filename);
            priv->filename = g_value_dup_string (value);
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
    }
}

static void
ufo_edf_3d_writer_task_get_property (GObject *object,
                              guint property_id,
                              GValue *value,
                              GParamSpec *pspec)
{
    UfoEdf3dWriterTaskPrivate *priv = UFO_EDF_3D_WRITER_TASK_GET_PRIVATE (object);

    switch (property_id) {
        case PROP_FILENAME:
            g_value_set_string (value, priv->filename);
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
    }
}

static void
ufo_edf_3d_writer_task_finalize (GObject *object)
{
    UfoEdf3dWriterTaskPrivate *priv;

    priv = UFO_EDF_3D_WRITER_TASK_GET_PRIVATE (object);

    g_free (priv->filename);
    g_free (priv->template);

    G_OBJECT_CLASS (ufo_edf_3d_writer_task_parent_class)->finalize (object);
}

static void
ufo_task_interface_init (UfoTaskIface *iface)
{
    iface->setup = ufo_edf_3d_writer_task_setup;
    iface->get_num_inputs = ufo_edf_3d_writer_task_get_num_inputs;
    iface->get_num_dimensions = ufo_edf_3d_writer_task_get_num_dimensions;
    iface->get_mode = ufo_edf_3d_writer_task_get_mode;
    iface->get_requisition = ufo_edf_3d_writer_task_get_requisition;
    iface->process = ufo_edf_3d_writer_task_process;
}

static void
ufo_edf_3d_writer_task_class_init (UfoEdf3dWriterTaskClass *klass)
{
    GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

    gobject_class->set_property = ufo_edf_3d_writer_task_set_property;
    gobject_class->get_property = ufo_edf_3d_writer_task_get_property;
    gobject_class->finalize = ufo_edf_3d_writer_task_finalize;

    properties[PROP_FILENAME] =
        g_param_spec_string ("filename",
            "Filename format string",
            "Format string of the path and filename. If multiple files are written it must contain a '%i' specifier denoting the current count",
            "./output-%05i.edf",
            G_PARAM_READWRITE);

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

    g_type_class_add_private (gobject_class, sizeof(UfoEdf3dWriterTaskPrivate));
}

static void
ufo_edf_3d_writer_task_init(UfoEdf3dWriterTask *self)
{
    self->priv = UFO_EDF_3D_WRITER_TASK_GET_PRIVATE(self);
    self->priv->filename = g_strdup ("./output-%05i.edf");
    self->priv->template = NULL;
    self->priv->counter = 0;
}