#include <config.h>
#define WNCK_I_KNOW_THIS_IS_UNSTABLE
#include <libwnck/libwnck.h>
#include <dirent.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <glibtop/procstate.h>

#include <vector>

#include "prettytable.h"
#include "defaulttable.h"
#include "proctable.h"
#include "util.h"


namespace
{
  const unsigned APP_ICON_SIZE = 16;
}


PrettyTable::PrettyTable()
{
    WnckScreen* screen = wnck_screen_get_default();
    g_signal_connect(G_OBJECT(screen), "application_opened",
                     G_CALLBACK(PrettyTable::on_application_opened), this);
    g_signal_connect(G_OBJECT(screen), "application_closed",
                     G_CALLBACK(PrettyTable::on_application_closed), this);
}


PrettyTable::~PrettyTable()
{
}


void
PrettyTable::on_application_opened(WnckScreen* screen, WnckApplication* app, gpointer data)
{
    PrettyTable * const that = static_cast<PrettyTable*>(data);
    FILE *f;

    pid_t pid = wnck_application_get_pid(app);

    if (pid == 0)
        return;

    const char* icon_name = wnck_application_get_icon_name(app);


    Glib::RefPtr<Gdk::Pixbuf> icon;

    // Make sure that icon_name is a valid symlink before loading.
    f = fopen (icon_name, "r");
    if (f != NULL) {
        fclose (f);
        icon = that->theme->load_icon(icon_name, APP_ICON_SIZE, Gtk::ICON_LOOKUP_USE_BUILTIN);
    }

    if (not icon) {
        icon = Glib::wrap(wnck_application_get_icon(app), /* take_copy */ true);
        icon = icon->scale_simple(APP_ICON_SIZE, APP_ICON_SIZE, Gdk::INTERP_HYPER);
    }

    if (not icon)
        return;

    that->register_application(pid, icon);
}



void
PrettyTable::register_application(pid_t pid, Glib::RefPtr<Gdk::Pixbuf> icon)
{
  /* If process already exists then set the icon. Otherwise put into hash
  ** table to be added later */
  if (ProcInfo* info = ProcInfo::find(pid))
    {
      info->set_icon(icon);
      // move the ref to the map
      this->apps[pid] = icon;
      procman_debug("MATEWNCK OK for %u", unsigned(pid));
    }
}



void
PrettyTable::on_application_closed(WnckScreen* screen, WnckApplication* app, gpointer data)
{
    pid_t pid = wnck_application_get_pid(app);

    if (pid == 0)
        return;

    static_cast<PrettyTable*>(data)->unregister_application(pid);
}



void
PrettyTable::unregister_application(pid_t pid)
{
    IconsForPID::iterator it(this->apps.find(pid));

    if (it != this->apps.end())
        this->apps.erase(it);
}



Glib::RefPtr<Gdk::Pixbuf>
PrettyTable::get_icon_from_theme(const ProcInfo &info)
{
    return this->theme->load_icon(info.name, APP_ICON_SIZE, Gtk::ICON_LOOKUP_USE_BUILTIN | Gtk::ICON_LOOKUP_FORCE_SIZE);
}


bool PrettyTable::get_default_icon_name(const string &cmd, string &name)
{
    for (size_t i = 0; i != G_N_ELEMENTS(default_table); ++i) {
        if (default_table[i].command->match(cmd)) {
            name = default_table[i].icon;
            return true;
        }
    }

    return false;
}

/*
  Try to get an icon from the default_table
  If it's not in defaults, try to load it.
  If there is no default for a command, store NULL in defaults
  so we don't have to lookup again.
*/

Glib::RefPtr<Gdk::Pixbuf>
PrettyTable::get_icon_from_default(const ProcInfo &info)
{
    Glib::RefPtr<Gdk::Pixbuf> pix;
    string name;

    if (this->get_default_icon_name(info.name, name)) {
        IconCache::iterator it(this->defaults.find(name));

        if (it == this->defaults.end()) {
            pix = this->theme->load_icon(name, APP_ICON_SIZE, Gtk::ICON_LOOKUP_USE_BUILTIN | Gtk::ICON_LOOKUP_FORCE_SIZE);
            if (pix)
                this->defaults[name] = pix;
            } else
                pix = it->second;
    }

    return pix;
}



Glib::RefPtr<Gdk::Pixbuf>
PrettyTable::get_icon_from_wnck(const ProcInfo &info)
{
    Glib::RefPtr<Gdk::Pixbuf> icon;

    IconsForPID::iterator it(this->apps.find(info.pid));

    if (it != this->apps.end())
        icon = it->second;

    return icon;
}



Glib::RefPtr<Gdk::Pixbuf>
PrettyTable::get_icon_from_name(const ProcInfo &info)
{
    return this->theme->load_icon(info.name, APP_ICON_SIZE, Gtk::ICON_LOOKUP_USE_BUILTIN | Gtk::ICON_LOOKUP_FORCE_SIZE);
}


Glib::RefPtr<Gdk::Pixbuf>
PrettyTable::get_icon_dummy(const ProcInfo &)
{
    return this->theme->load_icon("application-x-executable", APP_ICON_SIZE, Gtk::ICON_LOOKUP_USE_BUILTIN);
}


namespace
{
    bool has_kthreadd()
    {
        glibtop_proc_state buf;
        glibtop_get_proc_state(&buf, 2);

        return buf.cmd == string("kthreadd");
    }

    // @pre: has_kthreadd
    bool is_kthread(const ProcInfo &info)
    {
        return info.pid == 2 or info.ppid == 2;
    }
}


Glib::RefPtr<Gdk::Pixbuf>
PrettyTable::get_icon_for_kernel(const ProcInfo &info)
{
    if (is_kthread(info))
        return this->theme->load_icon("applications-system", APP_ICON_SIZE, Gtk::ICON_LOOKUP_USE_BUILTIN);

    return Glib::RefPtr<Gdk::Pixbuf>();
}



void
PrettyTable::set_icon(ProcInfo &info)
{
    typedef Glib::RefPtr<Gdk::Pixbuf>
        (PrettyTable::*Getter)(const ProcInfo &);

    static std::vector<Getter> getters;

    if (getters.empty())
    {
        getters.push_back(&PrettyTable::get_icon_from_wnck);
        getters.push_back(&PrettyTable::get_icon_from_theme);
        getters.push_back(&PrettyTable::get_icon_from_default);
        getters.push_back(&PrettyTable::get_icon_from_name);
        if (has_kthreadd())
        {
            procman_debug("kthreadd is running with PID 2");
            getters.push_back(&PrettyTable::get_icon_for_kernel);
        }
        getters.push_back(&PrettyTable::get_icon_dummy);
    }

    Glib::RefPtr<Gdk::Pixbuf> icon;

    for (size_t i = 0; not icon and i < getters.size(); ++i) {
        try {
            icon = (this->*getters[i])(info);
        }
        catch (std::exception& e) {
            g_warning("Failed to load icon for %s(%u) : %s", info.name, info.pid, e.what());
            continue;
        }
        catch (Glib::Exception& e) {
            g_warning("Failed to load icon for %s(%u) : %s", info.name, info.pid, e.what().c_str());
            continue;
        }
    }

    info.set_icon(icon);
}

