/* 
 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 of the
 * License.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301  USA
 */

#ifndef _WB_OVERVIEW_H_
#define _WB_OVERVIEW_H_

#include "grt/tree_model.h"
#include "grt/grt_manager.h"
#include "base/ui_form.h"

#include "wb_command_ui.h"

#include "grts/structs.workbench.h"

#include "wb_backend_public_interface.h"

#define DEFAULT_SECTION_HEIGHT 120

namespace wb {

  class WBContext;

  class MYSQLWBBACKEND_PUBLIC_FUNC OverviewBE : public bec::TreeModel, public bec::UIForm
  {
  public:

    enum OverviewColumn {
      Label, // editable
      NodeType,
      ChildNodeType,
      Expanded,
      Height,
      DisplayMode,

      FirstDetailField= 100
    };


    enum OverviewNodeType {
      ORoot,
      ODivision,
      OGroup,
      OSection,
      OItem,
      
      OSpecial
    };
    
    enum OverviewDisplayMode {
      MNone=0,
      MLargeIcon=1,
      MSmallIcon=2,
      MList=3
    };

  public:
    OverviewBE(WBContext *wb);
    virtual ~OverviewBE();
    
    WBContext *get_wb() { return _wb; }

    virtual std::string get_title();
    virtual std::string identifier() const= 0;
    
    virtual bool is_main_form() { return true; }

    virtual bec::NodeId get_child(const bec::NodeId &parent, size_t index);
    virtual size_t count_children(const bec::NodeId &parent);

    virtual grt::ValueRef get_grt_value(const bec::NodeId &node, ColumnId column);
    virtual bool get_field(const bec::NodeId &node, ColumnId column, std::string &value);
    virtual bool get_field(const bec::NodeId &node, ColumnId column, ssize_t &value);

    int get_details_field_count(const bec::NodeId &node);

    std::string get_field_name(const bec::NodeId &node, ColumnId column);
    virtual std::string get_field_description(const bec::NodeId &node, ColumnId column);
    virtual bec::IconId get_field_icon(const bec::NodeId &node, ColumnId column, bec::IconSize size);

    virtual bool set_field(const bec::NodeId &node, ColumnId column, const std::string &value);

    // only leaf nodes can be selected (for now)
    void begin_selection_marking();
    void end_selection_marking();
    void unselect_all(const bec::NodeId &node);
    void select_node(const bec::NodeId &node);
    
    boost::signals2::signal<void ()>* signal_selection_changed() { return  &_selection_change_signal; }
    grt::ListRef<GrtObject> get_selection();

    std::list<int> get_selected_children(const bec::NodeId &node);

    // only 1 node can be focused in each container node
    void focus_node(const bec::NodeId &node);
    bec::NodeId get_focused_child(const bec::NodeId &node);

    bec::NodeId get_node_child_for_object(const bec::NodeId &node, const grt::ObjectRef &object);

    virtual bool is_expansion_disabled() { return false; }
    virtual int get_default_tab_page_index() { return -1; }

    bec::NodeId search_child_item_node_matching(const bec::NodeId &node, const bec::NodeId &starting_node,
                                                const std::string &text);

    virtual bool activate_node(const bec::NodeId &node);
    std::string get_node_unique_id(const bec::NodeId &node);

    virtual bool is_editable(const bec::NodeId& node) const;
    virtual bool is_deletable(const bec::NodeId& node) const;
    virtual bool is_copyable(const bec::NodeId& node) const;
    bool request_add_object(const bec::NodeId &node);
    int request_delete_selected();
    bool request_delete_object(const bec::NodeId &node);

    virtual model_ModelRef get_model()= 0;

    virtual bec::MenuItemList get_popup_items_for_nodes(const std::vector<bec::NodeId> &nodes);
    virtual bool activate_popup_item_for_nodes(const std::string &name, const std::vector<bec::NodeId> &nodes);
    
    virtual bec::ToolbarItemList get_toolbar_items(const bec::NodeId &node);
    virtual bool activate_toolbar_item(const bec::NodeId &node, const std::string &name);

    // for use by backend
    void send_refresh_node(const bec::NodeId &node);
    void send_refresh_children(const bec::NodeId &node);

    // for use by frontend
    boost::function<void ()> pre_refresh_groups;
    void refresh();
    virtual void refresh_node(const bec::NodeId &node, bool children)= 0;

    virtual std::string get_edit_target_name();
    std::string get_target_name_for_nodes(const std::vector<bec::NodeId> &nodes);

    virtual bool can_cut();
    virtual bool can_copy();
    virtual bool can_paste();
    virtual bool can_delete();

    virtual void cut();
    virtual void copy();
    virtual void paste();
    virtual void delete_selection();

    // external drag & drop
    virtual std::string get_node_drag_type(const bec::NodeId &node) { return ""; }
    
    virtual bool should_accept_file_drop_to_node(const bec::NodeId &node, const std::string &path) { return false; }
    
    virtual void add_file_to_node(const bec::NodeId &node, const std::string &path) {}
    virtual void add_file_data_to_node(const bec::NodeId &node, const char *data, size_t length) {}
    virtual std::string get_file_for_node(const bec::NodeId &node) { return ""; }
    virtual bool get_file_data_for_node(const bec::NodeId &node, char *&data, size_t &length) { return true; }

    class MYSQLWBBACKEND_PUBLIC_FUNC Node
    {
    public:
      GrtObjectRef object;
      OverviewNodeType type;
      std::string label;
      std::string description;
      bec::IconId small_icon;
      bec::IconId large_icon;
      OverviewDisplayMode display_mode;
      bool expanded;
      bool selected;

      virtual Node *get_child(size_t i) { return 0; }
      virtual size_t count_children() { return 0; }
      virtual void refresh() {}

      virtual void focus(OverviewBE *sender) {}
      virtual bool activate(WBContext *wb) { return false; }
      virtual bool add_object(WBContext *wb) { return false; }
      virtual void delete_object(WBContext *wb) { }
      virtual bool is_deletable() { return false; }
      virtual void copy_object(WBContext *wb, bec::Clipboard *clip) { }
      virtual bool is_copyable() { return false; }
      virtual void paste_object(WBContext *wb, bec::Clipboard *clip) { }
      virtual bool is_pasteable(bec::Clipboard *clip) { return false; }

      virtual bool rename(WBContext *wb, const std::string &name) { return false; }
      virtual bool is_renameable() { return false; }

      virtual std::string get_unique_id() { return object.is_valid() ? object.id() : ""; }

      virtual std::string get_detail(int field) { return ""; }

      virtual int get_popup_menu_items(WBContext *wb, bec::MenuItemList &items);

      virtual workbench_OverviewPanelRef get_state(grt::GRT *grt)
      {
        workbench_OverviewPanelRef panel= workbench_OverviewPanelRef(grt);

        panel->expandedHeight(0);
        panel->expanded(expanded?1:0);
        panel->itemDisplayMode((int)display_mode);

        return panel;
      }

      virtual void restore_state(workbench_OverviewPanelRef panel) 
      {
        expanded= *panel->expanded() ? true : false;
        display_mode= (OverviewDisplayMode)*panel->itemDisplayMode();
      }

      Node() : small_icon(0), large_icon(0), display_mode(MNone), expanded(false), selected(false) {}

      Node(const Node &node) : type(node.type), label(node.label),
        description(node.description), small_icon(node.small_icon), large_icon(node.large_icon),
        display_mode(MNone), expanded(node.expanded), selected(false) {}

      virtual ~Node() {}      
    };


    class MYSQLWBBACKEND_PUBLIC_FUNC ObjectNode : public Node
    {
    public:
      ObjectNode()
      {
        type= OverviewBE::OItem;
      }
      ObjectNode(const ObjectNode &copy) : Node(copy)
      {
        type= OverviewBE::OItem;
      }
      
      virtual bool activate(WBContext *wb);
      virtual bool rename(WBContext *wb, const std::string &name);
      
      virtual void refresh()
      {
        label= object->name();
      }
    };


    class MYSQLWBBACKEND_PUBLIC_FUNC AddObjectNode : public virtual Node
    {
      boost::function<bool (WBContext*)> _add_slot;

    public:
      AddObjectNode(const boost::function<bool (WBContext*)> &add_slot)
        : _add_slot(add_slot) 
      {
        type= OverviewBE::OItem;
      }

      virtual bool activate(WBContext *wb)
      {
        return _add_slot(wb);
      }
    };


    class MYSQLWBBACKEND_PUBLIC_FUNC ContainerNode : public virtual Node
    {
    public:
      virtual void init() {}

    public:
      std::vector<Node*> children;
      Node *focused;
      OverviewNodeType child_type;

      ContainerNode(OverviewNodeType subtype) : focused(0), child_type(subtype) {}
      ContainerNode(const ContainerNode &node)
        : Node(node), children(node.children), focused(node.focused), child_type(node.child_type)
      {
      }

      virtual workbench_OverviewPanelRef get_state(grt::GRT *grt)
      {
        workbench_OverviewPanelRef panel= Node::get_state(grt);

        //XXXfor (std::list<int>::const_iterator i= selection.begin(); i != selection.end(); ++i)
        //  panel.selectedItems().insert(*i);

        return panel;
      }

      virtual void restore_state(const workbench_OverviewPanelRef &panel) 
      {
        Node::restore_state(panel);

        //selection.clear();
        //XXX for (size_t c= panel.selectedItems().count(), i= 0; i < c; i++)
        //  selection.push_back(panel.selectedItems().get(i));
      }
 
      virtual ~ContainerNode()
      {
        clear_children();
      }

      virtual Node *get_child(size_t i)
      {
        if (i >= children.size())
          return 0;
        return children[i];
      }

      virtual size_t count_children() { return children.size(); }

      void clear_children()
      {
        for (std::vector<Node*>::iterator iter= children.begin();
           iter != children.end(); ++iter)
        delete *iter;
        children.clear();
      }

      virtual int count_detail_fields() { return 0; }
      virtual std::string get_detail_name(int field) { return ""; }

      int get_focused_index()
      {
        int i= 0;
        for (std::vector<Node*>::iterator iter= children.begin();
             iter != children.end(); ++iter)
        {
          if ((*iter) == focused)
            return i;
          ++i;
        }
        return -1;
      }

      virtual void refresh_children() {}
    };

  protected:
    WBContext *_wb;
    boost::signals2::signal<void ()> _selection_change_signal;

    ContainerNode *_root_node;

    Node *get_node(const bec::NodeId &node) const { return do_get_node(node); }
    virtual Node *do_get_node(const bec::NodeId &node) const;

    Node *get_deepest_focused();

    void store_node_states(Node *node);
    void store_state();
    void restore_state();
  };

};


#endif /* _WB_OVERVIEW_H_ */