/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *                    2001 Bastien Nocera <hadess@hadess.net>
 *                    2003 Colin Walters <walters@verbum.org>
 *
 * gstgnomevfssink.c: 
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "gst/gst-i18n-plugin.h"

#include "gstgnomevfs.h"
#include "gstgnomevfsuri.h"

#include <gst/gst.h>
#include <libgnomevfs/gnome-vfs.h>
#include <string.h>
#include <errno.h>


#define GST_TYPE_GNOMEVFSSINK \
  (gst_gnomevfssink_get_type())
#define GST_GNOMEVFSSINK(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GNOMEVFSSINK,GstGnomeVFSSink))
#define GST_GNOMEVFSSINK_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GNOMEVFSSINK,GstGnomeVFSSinkClass))
#define GST_IS_GNOMEVFSSINK(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GNOMEVFSSINK))
#define GST_IS_GNOMEVFSSINK_CLASS(obj) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GNOMEVFSSINK))

typedef struct _GstGnomeVFSSink GstGnomeVFSSink;
typedef struct _GstGnomeVFSSinkClass GstGnomeVFSSinkClass;

typedef enum
{
  GST_GNOMEVFSSINK_OPEN = GST_ELEMENT_FLAG_LAST,

  GST_GNOMEVFSSINK_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 2
}
GstGnomeVFSSinkFlags;

struct _GstGnomeVFSSink
{
  GstElement element;

  /* uri */
  GnomeVFSURI *uri;
  gchar *uri_name;

  /* handle */
  GnomeVFSHandle *handle;

  /* whether we opened the handle ourselves */
  gboolean own_handle;
};

struct _GstGnomeVFSSinkClass
{
  GstElementClass parent_class;

  /* signals */
    gboolean (*erase_ask) (GstElement * element, GnomeVFSURI * uri);
};

/* GnomeVFSSink signals and args */
enum
{
  /* FILL ME */
  SIGNAL_ERASE_ASK,
  LAST_SIGNAL
};

enum
{
  ARG_0,
  ARG_LOCATION,
  ARG_URI,
  ARG_HANDLE
};

static void gst_gnomevfssink_base_init (gpointer g_class);
static void gst_gnomevfssink_class_init (GstGnomeVFSSinkClass * klass);
static void gst_gnomevfssink_init (GstGnomeVFSSink * gnomevfssink);
static void gst_gnomevfssink_finalize (GObject * obj);

static void gst_gnomevfssink_uri_handler_init (gpointer g_iface,
    gpointer iface_data);

static void gst_gnomevfssink_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_gnomevfssink_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static gboolean gst_gnomevfssink_open_file (GstGnomeVFSSink * sink);
static void gst_gnomevfssink_close_file (GstGnomeVFSSink * sink);

static void gst_gnomevfssink_chain (GstPad * pad, GstData * _data);

static GstStateChangeReturn gst_gnomevfssink_change_state (GstElement *
    element);

static GstElementClass *parent_class = NULL;
static guint gst_gnomevfssink_signals[LAST_SIGNAL] = { 0 };

GType
gst_gnomevfssink_get_type (void)
{
  static GType gnomevfssink_type = 0;

  if (!gnomevfssink_type) {
    static const GTypeInfo gnomevfssink_info = {
      sizeof (GstGnomeVFSSinkClass),
      gst_gnomevfssink_base_init,
      NULL,
      (GClassInitFunc) gst_gnomevfssink_class_init,
      NULL,
      NULL,
      sizeof (GstGnomeVFSSink),
      0,
      (GInstanceInitFunc) gst_gnomevfssink_init,
    };
    static const GInterfaceInfo urihandler_info = {
      gst_gnomevfssink_uri_handler_init,
      NULL,
      NULL
    };

    gnomevfssink_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstGnomeVFSSink",
        &gnomevfssink_info, 0);
    g_type_add_interface_static (gnomevfssink_type, GST_TYPE_URI_HANDLER,
        &urihandler_info);
  }
  return gnomevfssink_type;
}

static void
gst_gnomevfssink_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
  static GstElementDetails gst_gnomevfssink_details =
      GST_ELEMENT_DETAILS ("GnomeVFS Sink",
      "Sink/File",
      "Write stream to a GnomeVFS URI",
      "Bastien Nocera <hadess@hadess.net>");

  gst_element_class_set_details (element_class, &gst_gnomevfssink_details);
}

static gboolean
_gst_boolean_allow_overwrite_accumulator (GSignalInvocationHint * ihint,
    GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
  gboolean allow_overwrite;

  allow_overwrite = g_value_get_boolean (handler_return);
  if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
    g_value_set_boolean (return_accu, allow_overwrite);

  /* stop emission if signal doesn't allow overwriting */
  return allow_overwrite;
}

static void
gst_gnomevfssink_class_init (GstGnomeVFSSinkClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);


  gst_element_class_install_std_props (GST_ELEMENT_CLASS (klass),
      "location", ARG_LOCATION, G_PARAM_READWRITE, NULL);
  g_object_class_install_property (gobject_class, ARG_URI,
      g_param_spec_pointer ("uri", "GnomeVFSURI", "URI for GnomeVFS",
          G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, ARG_HANDLE,
      g_param_spec_pointer ("handle",
          "GnomeVFSHandle", "Handle for GnomeVFS", G_PARAM_READWRITE));

  gst_gnomevfssink_signals[SIGNAL_ERASE_ASK] =
      g_signal_new ("allow-overwrite", G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_CLEANUP, G_STRUCT_OFFSET (GstGnomeVFSSinkClass, erase_ask),
      _gst_boolean_allow_overwrite_accumulator, NULL,
      gst_marshal_BOOLEAN__POINTER, G_TYPE_BOOLEAN, 1, G_TYPE_POINTER);


  gobject_class->set_property = gst_gnomevfssink_set_property;
  gobject_class->get_property = gst_gnomevfssink_get_property;
  gobject_class->finalize = gst_gnomevfssink_finalize;

  gstelement_class->change_state = gst_gnomevfssink_change_state;

  /* gnome vfs engine init */
  if (gnome_vfs_initialized () == FALSE)
    gnome_vfs_init ();
}

static void
gst_gnomevfssink_finalize (GObject * obj)
{
  GstGnomeVFSSink *sink = GST_GNOMEVFSSINK (obj);

  if (sink->uri) {
    gnome_vfs_uri_unref (sink->uri);
    sink->uri = NULL;
  }

  if (sink->uri_name) {
    g_free (sink->uri_name);
    sink->uri_name = NULL;
  }

  G_OBJECT_CLASS (parent_class)->finalize (obj);
}

static void
gst_gnomevfssink_init (GstGnomeVFSSink * gnomevfssink)
{
  GstPad *pad;

  GST_OBJECT_FLAG_SET (gnomevfssink, GST_ELEMENT_EVENT_AWARE);

  pad = gst_pad_new ("sink", GST_PAD_SINK);
  gst_element_add_pad (GST_ELEMENT (gnomevfssink), pad);
  gst_pad_set_chain_function (pad, gst_gnomevfssink_chain);

  gnomevfssink->uri = NULL;
  gnomevfssink->uri_name = NULL;
  gnomevfssink->handle = NULL;
  gnomevfssink->own_handle = FALSE;
}

static guint
gst_gnomevfssink_uri_get_type (void)
{
  return GST_URI_SINK;
}

static gchar **
gst_gnomevfssink_uri_get_protocols (void)
{
  static gchar **protocols = NULL;

  if (!protocols)
    protocols = gst_gnomevfs_get_supported_uris ();

  return protocols;
}

static const gchar *
gst_gnomevfssink_uri_get_uri (GstURIHandler * handler)
{
  GstGnomeVFSSink *sink = GST_GNOMEVFSSINK (handler);

  return sink->uri_name;
}

static gboolean
gst_gnomevfssink_uri_set_uri (GstURIHandler * handler, const gchar * uri)
{
  GstGnomeVFSSink *sink = GST_GNOMEVFSSINK (handler);

  if (GST_STATE (sink) == GST_STATE_PLAYING ||
      GST_STATE (sink) == GST_STATE_PAUSED)
    return FALSE;

  g_object_set (G_OBJECT (sink), "location", uri, NULL);

  return TRUE;
}

static void
gst_gnomevfssink_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
  GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;

  iface->get_type = gst_gnomevfssink_uri_get_type;
  iface->get_protocols = gst_gnomevfssink_uri_get_protocols;
  iface->get_uri = gst_gnomevfssink_uri_get_uri;
  iface->set_uri = gst_gnomevfssink_uri_set_uri;
}

static void
gst_gnomevfssink_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstGnomeVFSSink *sink;

  sink = GST_GNOMEVFSSINK (object);

  switch (prop_id) {
    case ARG_LOCATION:
      if (GST_STATE (sink) == GST_STATE_NULL ||
          GST_STATE (sink) == GST_STATE_READY) {
        if (sink->uri) {
          gnome_vfs_uri_unref (sink->uri);
          sink->uri = NULL;
        }
        if (sink->uri_name) {
          g_free (sink->uri_name);
          sink->uri_name = NULL;
        }
        if (g_value_get_string (value)) {
          sink->uri_name = g_strdup (g_value_get_string (value));
          sink->uri = gnome_vfs_uri_new (sink->uri_name);
        }
      }
      break;
    case ARG_URI:
      if (GST_STATE (sink) == GST_STATE_NULL ||
          GST_STATE (sink) == GST_STATE_READY) {
        if (sink->uri) {
          gnome_vfs_uri_unref (sink->uri);
          sink->uri = NULL;
        }
        if (sink->uri_name) {
          g_free (sink->uri_name);
          sink->uri_name = NULL;
        }
        if (g_value_get_pointer (value)) {
          sink->uri = gnome_vfs_uri_ref (g_value_get_pointer (value));
          sink->uri_name = gnome_vfs_uri_to_string (sink->uri, 0);
        }
      }
      break;
    case ARG_HANDLE:
      if (GST_STATE (sink) == GST_STATE_NULL ||
          GST_STATE (sink) == GST_STATE_READY) {
        if (sink->uri) {
          gnome_vfs_uri_unref (sink->uri);
          sink->uri = NULL;
        }
        if (sink->uri_name) {
          g_free (sink->uri_name);
          sink->uri_name = NULL;
        }
        sink->handle = g_value_get_pointer (value);
      }
      break;
    default:
      break;
  }
}

static void
gst_gnomevfssink_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstGnomeVFSSink *sink;

  g_return_if_fail (GST_IS_GNOMEVFSSINK (object));

  sink = GST_GNOMEVFSSINK (object);

  switch (prop_id) {
    case ARG_LOCATION:
      g_value_set_string (value, sink->uri_name);
      break;
    case ARG_URI:
      g_value_set_pointer (value, sink->uri);
      break;
    case ARG_HANDLE:
      g_value_set_pointer (value, sink->handle);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static gboolean
gst_gnomevfssink_open_file (GstGnomeVFSSink * sink)
{
  GnomeVFSResult result;

  g_return_val_if_fail (!GST_OBJECT_FLAG_IS_SET (sink, GST_GNOMEVFSSINK_OPEN),
      FALSE);

  if (sink->uri) {
    /* open the file */
    result = gnome_vfs_create_uri (&(sink->handle), sink->uri,
        GNOME_VFS_OPEN_WRITE, TRUE,
        GNOME_VFS_PERM_USER_READ | GNOME_VFS_PERM_USER_WRITE
        | GNOME_VFS_PERM_GROUP_READ);
    /* if the file existed and the property says to ask, then ask! */
    if (result == GNOME_VFS_ERROR_FILE_EXISTS) {
      gboolean erase_anyway = FALSE;

      g_signal_emit (G_OBJECT (sink),
          gst_gnomevfssink_signals[SIGNAL_ERASE_ASK], 0, sink->uri,
          &erase_anyway);
      if (erase_anyway) {
        result = gnome_vfs_create_uri (&(sink->handle), sink->uri,
            GNOME_VFS_OPEN_WRITE, FALSE,
            GNOME_VFS_PERM_USER_READ | GNOME_VFS_PERM_USER_WRITE
            | GNOME_VFS_PERM_GROUP_READ);
      }
    }
    GST_DEBUG ("open: %s", gnome_vfs_result_to_string (result));
    if (result != GNOME_VFS_OK) {
      gchar *filename = gnome_vfs_uri_to_string (sink->uri,
          GNOME_VFS_URI_HIDE_PASSWORD);

      GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE,
          (_("Could not open vfs file \"%s\" for writing: %s."),
              filename, gnome_vfs_result_to_string (result)), GST_ERROR_SYSTEM);
      g_free (filename);
      return FALSE;
    }
    sink->own_handle = TRUE;
  } else if (!sink->handle) {
    GST_ELEMENT_ERROR (sink, RESOURCE, FAILED, (_("No filename given")),
        (NULL));
    return FALSE;
  } else {
    sink->own_handle = FALSE;
  }

  GST_OBJECT_FLAG_SET (sink, GST_GNOMEVFSSINK_OPEN);

  return TRUE;
}

static void
gst_gnomevfssink_close_file (GstGnomeVFSSink * sink)
{
  GnomeVFSResult result;

  g_return_if_fail (GST_OBJECT_FLAG_IS_SET (sink, GST_GNOMEVFSSINK_OPEN));

  if (sink->own_handle) {
    /* close the file */
    result = gnome_vfs_close (sink->handle);

    if (result != GNOME_VFS_OK) {
      gchar *filename = gnome_vfs_uri_to_string (sink->uri,
          GNOME_VFS_URI_HIDE_PASSWORD);

      GST_ELEMENT_ERROR (sink, RESOURCE, CLOSE,
          (_("Could not close vfs file \"%s\"."), filename), GST_ERROR_SYSTEM);
      g_free (filename);
    }

    sink->own_handle = FALSE;
    sink->handle = NULL;
  }

  GST_OBJECT_FLAG_UNSET (sink, GST_GNOMEVFSSINK_OPEN);
}

/**
 * gst_gnomevfssink_handle_event:
 * @sink: reference to GstGnomeVFSSink
 * @event: the event to dispatch
 *
 * Handles the event appropriately (seek, end-of-file, ...)
 *
 * Return value: whether to continue processing or not.
 */

static gboolean
gst_gnomevfssink_handle_event (GstGnomeVFSSink * sink, GstEvent * event)
{
  GstEventType type;
  gboolean res = FALSE;

  type = GST_EVENT_TYPE (event);

  switch (type) {
    case GST_EVENT_EOS:
      gst_gnomevfssink_close_file (sink);
      gst_element_set_eos (GST_ELEMENT (sink));
      break;

    case GST_EVENT_DISCONTINUOUS:{
      GnomeVFSResult res;
      gint64 offset;

      if (gst_event_discont_get_value (event, GST_FORMAT_BYTES, &offset)) {
        if ((res = gnome_vfs_seek (sink->handle, GNOME_VFS_SEEK_START,
                    offset)) != GNOME_VFS_OK) {
          GST_ERROR_OBJECT (sink, "Failed to seek to offset %"
              G_GINT64_FORMAT ": %s", offset, gnome_vfs_result_to_string (res));
        }
      }

      res = TRUE;
      break;
    }

    case GST_EVENT_SEEK:{
      GnomeVFSResult res;
      GnomeVFSSeekPosition method;
      gint64 offset;

      if (GST_EVENT_SEEK_FORMAT (event) != GST_FORMAT_BYTES) {
        GST_ERROR_OBJECT (sink, "Can only seek in bytes");
        break;
      }

      switch (GST_EVENT_SEEK_METHOD (event)) {
        case GST_SEEK_METHOD_SET:
          method = GNOME_VFS_SEEK_START;
          break;
        case GST_SEEK_METHOD_CUR:
          method = GNOME_VFS_SEEK_CURRENT;
          break;
        case GST_SEEK_METHOD_END:
          method = GNOME_VFS_SEEK_END;
          break;
        default:
          GST_ERROR_OBJECT (sink, "Unknown seek method %d",
              GST_EVENT_SEEK_METHOD (event));
          goto end;
          break;
      }
      offset = GST_EVENT_SEEK_OFFSET (event);

      if (GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH) {
        /* how does Gnome-VFS flush? */
      }

      if ((res = gnome_vfs_seek (sink->handle, method, offset)) != GNOME_VFS_OK) {
        GST_ERROR_OBJECT (sink, "Failed to seek to offset %"
            G_GINT64_FORMAT " with method %d: %s", offset, method,
            gnome_vfs_result_to_string (res));
      }

      res = TRUE;
      break;
    }

    case GST_EVENT_FLUSH:
      /* how does Gnome-VFS flush? */
      break;

    default:
      GST_WARNING ("Unhandled event type %d", type);
      gst_pad_event_default (gst_element_get_pad (GST_ELEMENT (sink), "sink"),
          event);
      event = NULL;
      break;
  }

end:
  if (event)
    gst_event_unref (event);

  return res;
}

/**
 * gst_gnomevfssink_chain:
 * @pad: the pad this gnomevfssink is connected to
 * @buf: the buffer that has to be absorbed
 *
 * take the buffer from the pad and write to file if it's open
 */
static void
gst_gnomevfssink_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf;
  GstGnomeVFSSink *sink;
  GnomeVFSResult result;
  GnomeVFSFileSize bytes_written;

  g_return_if_fail (pad != NULL);
  g_return_if_fail (GST_IS_PAD (pad));

  sink = GST_GNOMEVFSSINK (gst_pad_get_parent (pad));

  if (GST_OBJECT_FLAG_IS_SET (sink, GST_GNOMEVFSSINK_OPEN)) {
    if (GST_IS_EVENT (_data)) {
      gst_gnomevfssink_handle_event (sink, GST_EVENT (_data));
      return;
    }

    buf = GST_BUFFER (_data);
    g_return_if_fail (buf != NULL);
    result =
        gnome_vfs_write (sink->handle, GST_BUFFER_DATA (buf),
        GST_BUFFER_SIZE (buf), &bytes_written);
    GST_DEBUG ("write: %s, written_bytes: %" G_GUINT64_FORMAT,
        gnome_vfs_result_to_string (result), bytes_written);
    if (bytes_written < GST_BUFFER_SIZE (buf)) {
      printf ("gnomevfssink : Warning : %d bytes should be written, only %"
          G_GUINT64_FORMAT " bytes written\n", GST_BUFFER_SIZE (buf),
          bytes_written);
    }
  }
  gst_data_unref (_data);
}

static GstStateChangeReturn
gst_gnomevfssink_change_state (GstElement * element, GstStateChange transition)
{
  g_return_val_if_fail (GST_IS_GNOMEVFSSINK (element),
      GST_STATE_CHANGE_FAILURE);

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      if (!GST_OBJECT_FLAG_IS_SET (element, GST_GNOMEVFSSINK_OPEN)) {
        if (!gst_gnomevfssink_open_file (GST_GNOMEVFSSINK (element)))
          return GST_STATE_CHANGE_FAILURE;
      }
      break;
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      if (GST_OBJECT_FLAG_IS_SET (element, GST_GNOMEVFSSINK_OPEN))
        gst_gnomevfssink_close_file (GST_GNOMEVFSSINK (element));
      break;
    default:
      break;
  }

  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  return GST_STATE_CHANGE_SUCCESS;
}