// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_xml_styles
#define tools_xml_styles

#include "../vpair"
#include "../sg/style_colormap"
#include "../smatch"
#include "../sout"
#include "../forit"

namespace tools {
namespace xml {

class styles {
public:
  styles(std::ostream& a_out):m_out(a_out){}
  virtual ~styles(){}
public:
  styles(const styles& a_from)
  :m_out(a_from.m_out)
  ,m_named_styles(a_from.m_named_styles)
  ,m_aliases(a_from.m_aliases)
  ,m_cmaps(a_from.m_cmaps)
  {}
  styles& operator=(const styles& a_from){
    m_named_styles = a_from.m_named_styles;
    m_aliases = a_from.m_aliases;
    m_cmaps = a_from.m_cmaps;
    return *this;
  }
public:
  std::ostream& out() const {return m_out;}

  typedef std::pair<std::string,std::string> style_item_t;
  typedef std::vector<style_item_t> style_t;
  typedef std::pair<std::string,style_t> named_style_t;

  const std::vector<named_style_t>& named_styles() const {return m_named_styles;}
  std::vector<named_style_t>& named_styles() {return m_named_styles;}

  typedef std::pair<std::string,std::string> alias_t;
  const std::vector<alias_t>& aliases() const {return m_aliases;}
  std::vector<alias_t>& aliases() {return m_aliases;}

  const style_t* find_style(const std::string& a_name) const {
    tools_vforcit(named_style_t,m_named_styles,it){
      if((*it).first==a_name) return &((*it).second);
    }
    return 0;
  }

  void find_styles(const std::string& a_pattern,std::vector<std::string>& a_v) const {
    a_v.clear();
    tools_vforcit(named_style_t,m_named_styles,it){
      if(match((*it).first,a_pattern)) a_v.push_back((*it).first);
    }
  }

  void add_style(const std::string& a_name,const style_t& a_style) {
    tools_vforit(named_style_t,m_named_styles,it){
      if((*it).first==a_name) { //override
        (*it).second = a_style;
        return;
      }
    }
    m_named_styles.push_back(named_style_t(a_name,a_style));
  }

  void remove_styles(const std::string& a_pattern) {
    std::vector<named_style_t>::iterator it;
    for(it=m_named_styles.begin();it!=m_named_styles.end();) {
      if(match((*it).first,a_pattern)) {
        it = m_named_styles.erase(it);
      } else {
        it++;
      }
    }
  }

  void append(const styles& a_from) {
    tools_vforcit(named_style_t,a_from.m_named_styles,it) {
      m_named_styles.push_back(*it);
    }
  }

  bool is_alias(const std::string& a_wanted,std::string& a_style) const {
    if(find(m_aliases,a_wanted,a_style)) return true;
    a_style = a_wanted;
    return false;
  }

/*
  bool res_string(const std::string& a_style,
                         const std::string& a_key,
                         std::string& a_v) const {
    std::map<std::string,style_t>::const_iterator it = m_styles.find(a_style);
    if(it==m_styles.end()) {a_v.clear();return false;}
    const style_t& sty = (*it).second;
    if(!find(sty,a_key,a_v)) {a_v.clear();return false;}   
    return true;
  }
*/
  template <class T>
  bool res_value(const style_t& a_sty,const std::string& a_key,T& a_v,const std::string& a_msg) const {
    //NOTE : if ret false, we do not set a_v to something.

    std::string _s;
    if(!find(a_sty,a_key,_s)) {
      if(a_msg.size()) {
        m_out << "tools::xml::styles::res_value :"
              << " key " << sout(a_key) << " not found"
              << " in style " << sout(a_msg) << "."
              << std::endl;
      }
      return false;
    }
    T v;
    if(!to(_s,v)) {
      m_out << "tools::xml::styles::res_value :"
            << " for key " << sout(a_key) << " not found"
            << " in style " << sout(a_msg) << "."
            << " can't convert " << sout(_s) << " to value."
            << std::endl;
      return false;   
    }
    a_v = v;
    return true;
  }

  template <class T>
  bool res_value(const std::string& a_style,const std::string& a_key,T& a_v) const {
    //NOTE : if ret false, we do not set a_v to something.

    //look if a_style is an alias :
    std::string style;
    is_alias(a_style,style);

    const style_t* sty = find_style(style);
    if(!sty) {
      //m_out << "tools::xml::styles::res_value :"
      //      << " style " << sout(style) << " not found."
      //      << std::endl;
      return false;
    }
    T v;
    if(!res_value<T>(*sty,a_key,v,style)) return false;
    a_v = v;
    return true;
  }

  bool res_color(const style_t& a_sty,const std::string& a_key,colorf& a_color,const std::string& a_msg) const {
    //NOTE : if ret false, we do not set a_color to something.
    std::string s;
    if(!find(a_sty,a_key,s)) {
      if(a_msg.size()) {
        m_out << "tools::xml::styles::res_color :"
              << " key " << sout(a_key) << " not found"
              << " in style " << sout(a_msg) << "."
              << std::endl;
      }
      return false;
    }
    if(!sg::find_color(m_cmaps,s,a_color)) {
      m_out << "tools::xml::styles::res_color :"
            << " key " << sout(a_key) << " is not a color"
            << " in style " << sout(a_msg) << "."
            << std::endl;
      return false;
    }
    return true;
  }

  bool res_color(const std::string& a_style,const std::string& a_key,colorf& a_color) const {
    //NOTE : if ret false, we do not set a_color to something.

    //look if a_style is an alias :
    std::string style;
    is_alias(a_style,style);

    const style_t* sty = find_style(style);
    if(!sty) {
      //m_out << "tools::xml::styles::res_color :"
      //      << " style " << sout(style) << " not found."
      //      << std::endl;
      return false;
    }

    return res_color(*sty,a_key,a_color,style);
  }

  bool res_bool(const style_t& a_sty,const std::string& a_key,bool& a_v,const std::string& a_msg) const {
    //NOTE : if ret false, we do not set a_v to something.
    std::string s;
    if(!find(a_sty,a_key,s)) {
      if(a_msg.size()) {
        m_out << "tools::xml::styles::res_bool :"
              << " key " << sout(a_key) << " not found"
              << " in style " << sout(a_msg) << "."
              << std::endl;
      }
      return false;
    }
    bool v;
    if(!to(s,v)) {
      m_out << "tools::xml::styles::res_bool :"
            << " for key " << sout(a_key) << " not found"
            << " in style " << sout(a_msg) << "."
            << " can't convert " << sout(s) << " to bool."
            << std::endl;
      return false;   
    }
    a_v = v;
    return true;
  }

  bool res_bool(const std::string& a_style,const std::string& a_key,bool& a_v) const {
    //NOTE : if ret false, we do not set a_color to something.

    //look if a_style is an alias :
    std::string style;
    is_alias(a_style,style);

    const style_t* sty = find_style(style);
    if(!sty) {
      //m_out << "tools::xml::styles::res_color :"
      //      << " style " << sout(style) << " not found."
      //      << std::endl;
      return false;
    }

    return res_bool(*sty,a_key,a_v,style);
  }

  // for plotter :
  template <class T> //T = [style,text_style,line_style]
  bool res_sg_style(const std::string& a_style,T& a_sg_style) const {   
    //NOTE : a_sg_style is changed according to what is found.
    //       Then it is not fully reset by this method.
    const style_t* sty = find_style(a_style);
    if(!sty) {
      //could be ok to not find a plotter sub style.
      //m_out << "tools::sg::gui_viewer::res_sg_style :"
      //      << " style " << sout(a_style) << " not found."
      //      << std::endl;
      return false;
    }

    std::string _s;
    tools_vforcit(style_item_t,*sty,vit) {
      if(vit!=(*sty).begin()) _s += "\n";
      _s += (*vit).first;
      _s += " ";
      _s += (*vit).second;
    }
    return a_sg_style.from_string(m_out,m_cmaps,_s);
  }

  typedef sg::style_colormap cmap_t;
  bool find_colormap(const std::string& a_name,cmap_t& a_cmap) const {
    std::map<std::string,cmap_t>::const_iterator it = m_cmaps.find(a_name);
    if(it==m_cmaps.end()) return false;
    a_cmap = (*it).second;
    return true;
  }
  void add_colormap(const std::string& a_name,const cmap_t& a_cmap) {
    m_cmaps[a_name] = a_cmap;
  }
  //void clear_colormaps() {m_cmaps.clear();/*add default*/}

public:
  static bool is_plotter_style(const style_t& a_sty) {
    tools_vforcit(style_item_t,a_sty,it) {
      const std::string& key = (*it).first;
      const std::string& sv = (*it).second;
      if((key=="tag")&&(sv=="plotter_style")) return true;
    }
    return false;
  }

public:
  void find_plotter_styles(std::vector<std::string>& a_v) const {
    a_v.clear();
    tools_vforcit(named_style_t,m_named_styles,it) {
      if(is_plotter_style((*it).second)) a_v.push_back((*it).first);
    }
  }

  void dump() {
    tools_vforcit(named_style_t,m_named_styles,it) {

      m_out << "/////////////////////////////////////" << std::endl;
      m_out << "/// " << (*it).first << std::endl;
      m_out << "/////////////////////////////////////" << std::endl;

      const style_t& sty = (*it).second;

      tools_vforcit(style_item_t,sty,vit) {
        m_out << " " << (*vit).first << " " << (*vit).second << std::endl;
      }

    }
  }
protected:
  std::ostream& m_out;
  //styles :
  std::vector<named_style_t> m_named_styles;
  std::vector<alias_t> m_aliases;
  //cmaps :
  sg::cmaps_t m_cmaps;
};

}}

#include "tree"
#include "../vmanip"

namespace tools {
namespace xml {

inline void load_style(styles& a_styles,const tree& a_tree) {
  std::string name;
  a_tree.attribute_value("name",name);
  if(name.empty()) {
    a_styles.out() << "tools::sg::gui_viewer::load_style :"
          << " <style> without name."
          << std::endl;
    return;
  }  

  styles::style_t sty;

 {looper _for(a_tree);
  while(element* _elem = _for.next_element()) {

      if(_elem->name()=="copy") {

        std::string from;
        _elem->attribute_value("from",from); //expect another style name.
        if(from.empty()) {
          a_styles.out() << "tools::sg::gui_viewer::load_style :"
                         << " <copy> without from."
                         << std::endl;
          return;
        } 

        const styles::style_t* csty = a_styles.find_style(from);
        if(!csty) {
          a_styles.out() << "tools::sg::gui_viewer::load_style :"
                     << " <copy> : from " << sout(from) << " not found."
                     << std::endl;
          return;
        }

        append(sty,*csty);

      } else {
        sty.push_back(styles::style_item_t(_elem->name(),_elem->value()));
      }

  }}
  
  if(sty.size()) a_styles.add_style(name,sty);
}

inline void load_plotter_style(styles& a_styles,const tree& a_tree) {
  std::string pname;
  a_tree.attribute_value("name",pname);
  if(pname.empty()) {
    a_styles.out() << "tools::sg::gui_viewer::load_plotter_style :"
          << " <plotter_style> without name."
          << std::endl;
    return;
  }  

 {styles::style_t sty;
  sty.push_back(styles::style_item_t("tag","plotter_style"));

 {looper _for(a_tree);
  while(element* _elem = _for.next_element()) {

      if(_elem->name()=="copy") {

        std::string from;
        _elem->attribute_value("from",from); //expect a plotter_style name.
        if(from.empty()) {
          a_styles.out() << "tools::sg::gui_viewer::load_plotter_style :"
                << " <copy> without from."
                << std::endl;
          return;
        } 

        const styles::style_t* csty = a_styles.find_style(from);
        if(!csty) {
          a_styles.out() << "tools::sg::gui_viewer::load_plotter_style :"
                << " <copy> : from " << sout(from) << " not found."
                << std::endl;
          return;
        }
        if(csty->size()) a_styles.add_style(pname,*csty);

        if(styles::is_plotter_style(*csty)) {
          //search all <from>.<sub_style> styles :
          std::string head = from+".";
          std::string::size_type l = head.size();

          styles sts(a_styles.out());

          const std::vector<styles::named_style_t>& nss =
            a_styles.named_styles();
          tools_vforcit(styles::named_style_t,nss,it){
            const std::string& name = (*it).first;
            if(name.substr(0,l)==head) {
              std::string tail = name.substr(l,name.size()-l);
              const styles::style_t& ssty = (*it).second;
              if(ssty.size()) {
                sts.add_style(pname+"."+tail,ssty);
              }
            }
          }

          a_styles.append(sts);

        }


      } else {
        sty.push_back(styles::style_item_t(_elem->name(),_elem->value()));
      }

  }}

  if(sty.size()) a_styles.add_style(pname,sty);}

 {looper _for(a_tree);
  while(tree* _tree = _for.next_tree()) {

      const std::string& tag = _tree->tag_name();
      if(tag=="style") {

        std::string name;
        _tree->attribute_value("name",name);
        if(name.empty()) {
          a_styles.out() << "tools::sg::gui_viewer::load_plotter_style :"
                << " <style> without name."
                << std::endl;
          return;
        }
  
       {styles::style_t sty;

       {looper _for2(*_tree);
        while(element* _elem = _for2.next_element()) {
          sty.push_back(styles::style_item_t(_elem->name(),_elem->value()));
        }}

        if(sty.size()) {
          std::string path = pname+"."+name;
          a_styles.add_style(path,sty);
        }}

      } else {
        a_styles.out() << "tools::sg::gui_viewer::load_plotter_style :"
              << " unexpected tag " << sout(tag) << "."
              << std::endl;
      }

  }}

}

inline bool scan_style_tree(styles& a_styles,const tree& a_tree) {

  if(a_tree.tag_name()!="styles") return false;
  
  // look for aliases :
 {looper _for(a_tree);
  while(element* _elem = _for.next_element()) {

      std::string name;
      _elem->attribute_value("name",name);
      if(name.empty()) {
        a_styles.out() << "tools::sg::gui_viewer::load_style :"
              << " <alias> without name."
              << std::endl;
        continue;
      }
      add<std::string,std::string>(a_styles.aliases(),name,_elem->value());
  }}

  // scan children :
 {looper _for(a_tree);
  while(tree* _tree = _for.next_tree()) {

      const std::string& tag = _tree->tag_name();
      if(tag=="style") {   
        load_style(a_styles,*_tree);
      } else if(tag=="plotter_style") {   
        load_plotter_style(a_styles,*_tree);
      }

  }}
  
  return true;
}
}}

#endif