/*  $Id$

    Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi.psy.uva.nl/projects/xpce/
    Copyright (C): 1985-2002, University of Amsterdam

    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; either version 2
    of the License, or (at your option) any later version.

    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 Lesser 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

    As a special exception, if you link this library with other files,
    compiled with a Free Software compiler, to produce an executable, this
    library does not by itself cause the resulting executable to be covered
    by the GNU General Public License. This exception does not however
    invalidate any other reasons why the executable file might be covered by
    the GNU General Public License.
*/

:- module(pce_http_man,
	  [ pce_http_man/1		% ?Port
	  ]).
:- use_module(library(pce)).
:- use_module(library('http/html_write')).
:- use_module(httpd).
:- use_module(html_hierarchy).
:- use_module(html_refman).

:- use_module(library('man/v_search')).
:- pce_autoload(man_inheritance_tree, library('man/v_inherit')).

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Demo for the XPCE HTTP Deamon. This demo provides a extensive tranlation
of the XPCE class hierarchy and class documentation to HTML.

To test it, do:

	?- [http_man].
	?- pce_http_man(8080).		% or some other port

Then run your browser and start at the url http://localhost:8080/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

url(pcehome, 'http://www.swi-prolog.org/packages/xpce/').
url(pceusg,  'http://www.swi.psy.uva.nl/projects/xpce/UserGuide').

pce_http_man(Port) :-			% start on anonymous port
	var(Port), !,
	new(HTTPD, manpce_httpd),
	get(HTTPD, address, Port).
pce_http_man(Port) :-
	new(_, manpce_httpd(Port)).

:- pce_begin_class(manpce_httpd, httpd,
		   "Demo HTTPD for XPCE manual").

accepted(HTTPD) :->
	"Log connections"::
	send_super(HTTPD, accepted),
	get(HTTPD, peer_name, Peer),
	log(connect(Peer)).


request(HTTPD, Request:sheet) :->
	get(Request, path, Path),
	get(Request, form, Form),
	log(request(Request)),
	flag(requests, N, N+1),
	reply(Path, Form, HTTPD).

:- pce_end_class.

		 /*******************************
		 *	        LOG		*
		 *******************************/

log(connect(Peer)) :- !,
	(   send(Peer, instance_of, tuple)
	->  send(@pce, format, 'New connection from %s:%s\n', 
		 Peer?first, Peer?second)
	;   send(@pce, format, 'New connection from %s\n', Peer)
	).
log(request(Request)) :- !,
	get(Request, path, Path),
	send(@pce, format, '\t%s\n', Path),
	(   get(Request, form, Form),
	    Form \== @nil
	->  send(Form, for_all,
		 message(@pce, format, '\t\t%s=%s\n', @arg1?name, @arg1?value))
	;   true
	).
log(_).


		 /*******************************
		 *	      REPLIES		*
		 *******************************/

:- discontiguous
	reply/3.

%	/
%

reply(/, @nil, HTTPD) :-
	send(HTTPD, reply_html, pce_http_man:frames).

frames -->
	html(html([ head(title('XPCE web-manual')),
		    frameset([cols('25%,75%')],
			     [ frame([ src('/classhierarchy'),
				       name(hierarchy)
				     ]),
			       frameset([ rows('60,*')
					],
					[ frame([ src('/top'),
						  name(top)
						]),
					  frame([ src('/search'),
						  name(description)
						])
					])
			     ])
		  ])).

%	/class/
%
%	Provide a table with all classes

reply('/class/', @nil, HTTPD) :-
	new(Classes, chain),
	send(@classes, for_all, message(Classes, append, @arg1)),
	send(Classes, sort),
	chain_list(Classes, Sorted),
	send(HTTPD, reply_html, pce_http_man:classindex(Sorted)).

classindex(Classes) -->
	page(title('XPCE Class Index'),
	     [ h1([align(center)], 'XPCE Class Index'),
	       table([ border(2),
		       align(center)
		     ],
		     [ tr([ th('Name'),
			    th('Summary')
			  ])
		     | \classrows(Classes)
		     ])
	     ]).

classrows([]) -->
	[].
classrows([H|T]) -->
	classrow(H),
	classrows(T).

classrow(Name) -->
	{ get(@pce, convert, Name, class, Class),
	  get(Class, summary, Summary)
	},
	html(tr([ td(\class_name(Name)),
		  td(Summary)
		])).

class_name(Class) -->
	{ object(Class), !,
	  get(Class, name, Name)
	},
	class_name(Name).
class_name(Name) -->
	{ www_form_encode(Name, Encoded),
	  atom_concat('/class?name=', Encoded, URL)
	},
	html(a([href(URL), target(description)], Name)).

classlist([], _) -->
	[].
classlist([H], _) -->
	class_name(H).
classlist([H|T], S) -->
	html([\class_name(H), S]),
	classlist(T, S).

%	/class?name=classname
%
%	Provide documentation on the class.

reply('/class', Form, HTTPD) :-
	get(Form, name, Class), !,
	get(@pce, convert, Class, class, ClassObj),
	send(HTTPD, reply_html, pce_http_man:classpage(ClassObj)).

classpage(Class) -->
	{ get(Class, name, Name)
	},
	page([ title(['XPCE class ', Name])
	     ],
	     \classdoc(Class)
	    ).

classdoc(Class) -->
	{ get(Class, name, Name),
	  make_diagram([Name], Diagram)
	},
	html([ h1([align(center)], ['XPCE class ', em(Name)]),
	       hr([]),
	       center(Diagram),
	       p([]),
	       \classtable(Class),
	       h2('Description'),
	       \description(Class),
	       p([]),
	       \classbehaviour(Class)
	     ]).

description(Obj) -->
	{ html_description(Obj, String),
	  get(String, value, HTML)
	},
	[HTML].
	

classtable(Class) -->
	html_begin(table(border(2),
			 align(center),
			 width('100%'))),
	summary_row(Class),
	meta_class_row(Class),
	super_class_row(Class),
	subclasses_row(Class),
	instance_variables(Class),
	html_end(table).

summary_row(Class) -->
	{ get(Class, summary, Summary),
	  Summary \== @nil
	}, !,
	head_row('Summary', Summary).
summary_row(_) -->
	[].

meta_class_row(Class) -->
	{ get(Class, class, MetaClass),
	  \+ get(MetaClass, name, class)
	}, !,
	head_row('Meta Class', \class_name(MetaClass)).
meta_class_row(_) -->
	[].

super_class_row(Class) -->
	{ get(Class, super_class, Super),
	  Super \== @nil
	}, !,
	head_row('Super Class', \class_name(Super)).
super_class_row(_) -->
	[].

subclasses_row(Class) -->
	{ get(Class, sub_classes, Subs),
	  Subs \== @nil,
	  chain_list(Subs, List)
	}, !,
	head_row('Sub Classes', \classlist(List, ', ')).
subclasses_row(_) -->
	[].

head_row(Name, Value) -->
	html(tr([ th([align(right), colspan(2)], Name),
		  td(Value)
		])).


instance_variables(Class) -->
	{ get(Class, instance_variables, Vector),
	  object(Vector, Term),
	  Term =.. [_|Vars]
	},
	html([ tr([ th([ colspan(3),
			 bgcolor(yellow)
		       ],
		       'Instance variables')
		  ]),
	       tr([ th('Name'),
		    th('Type'),
		    th('Summary')
		  ])
	     | \variables(Vars)
	     ]).

variables([]) -->
	[].
variables([H|T]) -->
	{ get(H, name, Name),
	  get(H, type, Type),
	  get(H, summary, Summary)
	},
	html([ tr([td(Name), td(\type(Type)), td(Summary)])
	     ]),
	variables(T).


		 /*******************************
		 *	    BEHAVIOUR		*
		 *******************************/

classbehaviour(Class) -->
	{ collect_behaviour(Class, Chain),
	  group_objects(Chain, Groups),	% Groups is a sheet name->chain
	  get_chain(Groups, attribute_names, List)
	},
	html(h2('Behaviour')),
	groups(List, Groups).

groups([], _) -->
	[].
groups([H|T], Groups) -->
	{ get(Groups, value, H, Chain),
	  chain_list(Chain, Members)
	},
	group(H, Members),
	groups(T, Groups).

group(Group, Members) -->
	{ cluster_behaviour(Members, Clusters),
	  chain_list(Clusters, List)
	},
	html([ \group_header(Group),
	       dl(\behaviour_clusters(List))
	     ]).
	       

group_header(Group) -->
	{ group_summary(Group, Summary), !,
	  get(Group, capitalise, GroupName)
	},
	html(h4([hr([]), GroupName, ' -- ', em(Summary)])).
group_header(Group) -->
	{ get(Group, capitalise, GroupName)
	},
	html(h4(GroupName)).


behaviour_clusters([]) -->
	[].
behaviour_clusters([H|T]) -->
	{ chain_list(H, L),
	  L = [First|_]
	},
	html([ dt(\headlines(L)),
	       dd(\description(First))
	     ]),
	behaviour_clusters(T).
	
headlines([]) -->
	[].
headlines([H]) --> !,
	headline(H).
headlines([H|T]) --> !,
	headline(H),
	html(br([])),
	headlines(T).

		 /*******************************
		 *	    INHERITANCE		*
		 *******************************/

%	/inherit?class=Class
%
%	Show inheritance/delegation picture

reply('/inherit', Form, HTTPD) :-
	Form \== @nil,
	get(Form, value, class, Class),
	make_diagram([Class], Dia),
	send(HTTPD, reply, Dia).
	

:- dynamic
	saved_diagram/2.

make_diagram(Classes, I) :-
	saved_diagram(Classes, I), !.
make_diagram(Classes, I) :-
	new(I, man_inheritance_tree),
	send(I, level_gap, 15),
	forall(member(C, Classes), send(I, show, C, @off)),
	send(I, for_all,
	     message(@prolog, add_href, @arg1?image)),
	send(I, lock_object, @on),
	assert(saved_diagram(Classes, I)).

add_href(Text) :-
	get(Text?string, value, ClassName),
	www_form_encode(ClassName, Encoded),
	atom_concat('/class?name=', Encoded, HREF),
	send(Text, attribute, href, HREF).


		 /*******************************
		 *	  CLASS HIERARCHY	*
		 *******************************/

%	/classhierarchy
%	/classhierarchy?root=name
%
%	Emit the class hierarchy

reply('/classhierarchy', Form, HTTPD) :-
	(   Form \== @nil,
	    get(Form, value, root, Root)
	->  true
	;   Root = object
	),
	get(HTTPD, request, Request),
	(   get(Request, value, cookie, Cookie)
	;   Cookie = []
	),
	send(HTTPD, reply_html, pce_http_man:classhierarchy(Root, Cookie)).
reply(Path, @nil, HTTPD) :-
	html_hierarchy_image(Path, Image), !,
	send(HTTPD, reply, Image).

classhierarchy(Root, Cookie) -->
	{   pageYOffset(Cookie, Y), Y \== 0
	->  sformat(JS, 'window.scrollTo(0, ~w)', [Y]),
	    OnLoad = [onLoad(JS)]
	;   OnLoad = []
	},
	page([ head(title('XPCE Class Hierarchy')),
	       body([ bgcolor(white)
		    | OnLoad
		    ],
		    [ h3('Class Hierarchy')
		    | \html_hierarchy(Root,
				      gen_subclass, hierarchy_class_name,
				      Cookie)
		    ])
	     ]).	       

hierarchy_class_name(Name) -->
	{ www_form_encode(Name, Encoded),
	  atom_concat('/class?name=', Encoded, URL)
	},
	html(a([name(Encoded), href(URL), target(description)], Name)).

gen_subclass(Super, Sub) :-
	get(@pce, convert, Super, class, Class),
	get(Class, sub_classes, Chain),
	chain_list(Chain, List),
	member(SubClass, List),
	get(SubClass, name, Sub).

%	/man?for=Spec
%
%	As manpce/1: handle @ref, class, class->method, class<-method, etc.

reply('/man', Form, HTTPD) :-
	(   get(Form, value, for, String)
	->  atom_to_method(String, Object)
	;   get(Form, value, id, Id),
	    man_search:object_from_id(Id, Object)
	),
	send(HTTPD, reply_html, pce_http_man:objpage(Object)).
	
objpage(Object) -->
	page([title('XPCE Manual')],
	     [\objdoc(Object)
	     ]).

objdoc(Object) -->
	{ send(Object, instance_of, class)
	}, !,
	classdoc(Object).
objdoc(SendMethod) -->
	{ send(SendMethod, instance_of, behaviour)
	}, !,
	html(dl(\behaviour(SendMethod))).
objdoc(Object) -->
	html(dl(\object(Object))).


behaviour(M) -->
	html([ dt(\headline(M)),
	       dd(\description(M))
	     ]).

object(@Ref) -->
	html([ dt(b([@, Ref])),
	       dd(\description(@Ref))
	     ]).

headline(SM) -->
	{ send(SM, instance_of, send_method)
	}, !,
	html([ \contextclass(SM),
	       '->',
	       b(\name(SM)),
	       '(',
	       \argv(SM),
	       ')'
	     ]).
headline(GM) -->
	{ send(GM, instance_of, get_method),
	  get(GM, return_type, Return)
	}, !,
	html([ \contextclass(GM),
	       '<-',
	       b(\name(GM)),
	       '(',
	       \argv(GM),
	       ') --> ',
	       \type(Return)
	     ]).
headline(V) -->
	{ send(V, instance_of, variable),
	  get(V, access_arrow, Arrow),
	  get(V, type, Type)
	}, !,
	html([ \contextclass(V),
	       Arrow,
	       b(\name(V)),
	       ': ',
	       \type(Type)
	     ]).
headline(V) -->
	{ send(V, instance_of, class)
	}, !,
	html([ 'Class ', b(\name(V))
	     ]).
headline(V) -->
	objref(V).
	       
contextclass(SM) -->
	{ get(SM, context, Class),
	  send(Class, instance_of, class)
	},
	class_name(Class).

name(Obj) -->
	{ send(Obj, has_get_method, name), !,
	  get(Obj, name, Name)
	},
	html(Name).
name(Obj) -->
	html(Obj).

objref(@Obj) -->
	{ get(@Obj, class_name, Name)
	},
	html([@, Obj, /, Name]).

argv(Method) -->
	{ get(Method, types, Argv),
	  get(Argv, size, Size)
	},
	argv(1, Size, Argv).
	
argv(I, AC, V) -->
	{ I =< AC, !,
	  get(V, element, I, Type)
	},
	(   { get(Type, argument_name, ArgName),
	      ArgName \== @nil
	    }
	->  html([ var(ArgName),
		   =,
		   \type(Type)
		 ])
	;   type(Type)
	),
	(   { I < AC
	    }
	->  [ ', ' ]
	;   []
	),
	{ NI is I + 1
	},
	argv(NI, AC, V).
argv(_, _, _) -->
	[].


		 /*******************************
		 *	      SEARCH		*
		 *******************************/

%	/search?for=pattern
%
%	Execute a search

reply('/search', @nil, HTTPD) :- !,
	send(HTTPD, reply_html, pce_http_man:searchpage).

searchpage -->
	page([ title('Search XPCE manual')
	     ],
	     [ \searchhead,
	       \searchform('', 25)
	     ]).

searchhead -->
	html([ h1('Search the XPCE reference manual'),
	       p([ 'Please use the form below to search through the XPCE ',
		   'reference material. ',
		   'Advanced syntax: '
		 ]),
	       dl([dt(b('<...>')),
		   dd('Word-match rather then substring match'),
		   dt(b('not ...')),
		   dd('Not containing ...'),
		   dt(b('... and ...')),
		   dd('Containing both expressions (default)'),
		   dt(b('... or ...')),
		   dd('Containing either expression'),
		   dt(b('(...)')),
		   dd('Use braces to specify nesting')
		  ]),
	       p([])
	     ]).

searchform(For, Max) -->
	html(form([ action('/search'),
		    method('GET')
		  ],
		  table(align(center),
			[ tr([ td(align(right), b('Search for')),
			       td(colspan(2),
				  input([name(for), value(For), size(40)]))
			     ]),
			  tr([ td(align(right), b('Max results')),
			       td(align(left),
				  select(name(max_results),
					 [ \option(10, Max),
					   \option(25, Max),
					   \option(100, Max)
					 ])),
			       td(align(right),
				  input(type(submit)))
			     ])
			]))).

option(Value, Value) --> !,
	html(option(selected, Value)).
option(Value, _) -->
	html(option([], Value)).

reply('/search', Form, HTTPD) :-
	get(Form, value, for, For),
	(   get(Form, value, max_results, M0),
	    get(@pce, convert, M0, int, Max)
	->  true
	;   Max = 25
	),
	(   get(Form, value, from, From0),
	    get(@pce, convert, From0, int, From)
	->  true
	;   From = 0
	),
	send(HTTPD, reply_html, pce_http_man:search(For, Max, From)).

search(For, Max, From) -->
	{ search_index(@man_index),
	  man_search:parse_search_spec(For, Term),
	  man_search:execute_search(Term, @man_index, CardsIds),
	  get(CardsIds, size, Matches),
	  (   From == 0
	  ->  (   Matches > Max
	      ->  get(CardsIds, sub, 0, Max, Ch2),
		  chain_list(Ch2, List),
		  Found = p([ 'Showing first ~w matches of ~w. '-
			        [Max, Matches],
			      \next(For, Max, From)
			    ])
	      ;   chain_list(CardsIds, List),
		  Found = p('Found ~w matches'-[Matches])
	      )
	  ;   To is From+Max,
	      get(CardsIds, sub, From, To, Ch2),
	      chain_list(Ch2, List),
	      (	  Matches > To
	      ->  Next = [\next(For, Max, From)
			 ]
	      ;	  Next = []
	      ),
	      get(List, size, Size),
	      TheTo is From + Size,
	      Found = p([ 'Showing matches from ~w to ~w from ~w. '-
			    [From, TheTo, Matches]
			| Next
			])
	  )
	},
	page([title(['XPCE Search results for ', For])],
	     [ h2(['Search results for ', em(For)]),
	       Found,
	       p([]),
	       table([ width('100%')
		     ],
		     [ col(width('30%')),
		       col(width('70%'))
		     | \search_results(List)
		     ]),
	       p([]),
	       hr([]),
	       \searchform(For, Max)
	     ]).

next(For, Max, From) -->
	{ NewFrom is From+Max,
	  www_form_encode(For, F1),
	  www_form_encode(Max, F2),
	  www_form_encode(NewFrom, F3),
	  concat_atom(['/search?for=', F1,
		       '&max_results=', F2,
		       '&from=', F3],
		      URL)
	},
	html(a(href(URL), next)).


search_results([]) -->
	[].
search_results([H|T]) -->
	search_result(H),
	search_results(T).

search_result(Id) -->
	{ man_search:object_from_id(Id, Object),
	  www_form_encode(Id, Encoded),
	  atom_concat('/man?id=', Encoded, HREF),
	  (   get(Object, summary, Summary),
	      Summary \== @nil
	  ;   Summary = ''
	  )
	},
	html([ tr([ td(a(href(HREF), Object)),
		    td(Summary)
		  ])
	     ]).
	

search_index(Index) :-
	object(Index), !.
search_index(@Ref) :-
	absolute_file_name(pce('/man/reference/index'),
			   [ extensions([obj]),
			     access(read),
			     file_errors(fail)
			   ],
			   IndexFile),
	get(file(IndexFile), object, Obj),
	send(Obj, name_reference, Ref).

%	/about
%
%	Temporary stuff

reply('/about', @nil, HTTPD) :-
	send(HTTPD, reply_html, pce_http_man:about).

about -->
	page([ title('About the XPCE Web manual')
	     ],
	     [ h3('About the XPCE Web manual'),
	       
	       p(\['The XPCE Web-manual is based on the built-in XPCE online ',
		   'manual started using the <b>manpce/0</b> predicate.']),
	       p(\['This manual can be read from the main XPCE site or installed ',
		   'locally.  Please refer to the directory ',
		   '<b><tt>.../xpce/prolog/lib/http</tt></b> for details.'])
	     ]).

reply('/top', @nil, HTTPD) :-
	send(HTTPD, reply_html, pce_http_man:top).

top -->
	{ url(pcehome, Home),
	  url(pceusg, USG)
	},
	page([ title('XPCE reference manual index'),
	       meta(['http-equiv'('Refresh'), content(60)])
	     ],
	     [ p(align(center),
		 [ \link(Home, 'XPCE Home'), ' ',
		   \link(USG,  'User Guide'), ' ',
		   \link('/search', 'Search'), ' ',
		   \link('/about',  'About'),
		   br([]),
		   font(size(-1), em(\info))
		 ])
	     ]).
		       

link(URL, Name) -->
	html([ '[', a([ href(URL), target(description) ], Name), ']' ]).


info -->
	{ get(@pce, version, Version),
	  flag(requests, Requests, Requests),
	  statistics(cputime, CPU),
	  sformat(C2, '~2f', [CPU])
	},
	html([ 'XPCE ', Version,
	       '; Up ', \uptime,
	       '; Processed ', Requests, ' requests in ', C2, ' seconds'
	      ]).

:- pce_global(@started, new(date)).
:- get(@started, class, _).		% just create it

uptime -->
	{ get(new(date), difference, @started, minute, UpMinutes),
	  UpDays  is UpMinutes // (24*60),
	  UpHours is UpMinutes // 60 - UpDays*24,
	  UpMin   is UpMinutes mod 60
	},
	html([ UpDays, ' days ', UpHours, h, UpMin, m ]).





%	/blank
%
%	Just emit a blank page

reply('/blank', @nil, HTTPD) :-
	send(HTTPD, reply_html, pce_http_man:blankpage).

blankpage -->
	page([title(blank)], []).

%	Catch all.  Do not add clauses for reply below this line

reply(Path, @nil, HTTPD) :-
	send(HTTPD, not_found, Path).



		 /*******************************
		 *             TYPES		*
		 *******************************/

type(T) -->
	{ get(T, kind, alias),
	  get(T, argument_name, ArgName),
	  ArgName \== @nil, !,
	  get(T, context, Type)
	},
	type(Type).
type(T) -->
	{ get(T, kind, class), !,
	  get(T, context, C),
	  (   atom(C)
	  ->  Name = C
	  ;   get(C, name, Name)
	  )
	},
	type_default(T, '['),
	class_name(Name),
	type_supers(T),
	type_default(T, ']'),
	type_nil(T),
	type_vector(T).
type(T) -->
	{ get(T, name, Name),
	  atom_length(Name, L)
	},
	(   { L > 20,
	      make_breakable(Name, Full)
	    }
	->  html(Full)
	;   html(Name)
	).

make_breakable(Atom, Breakable) :-
	new(Breakable, string('%s', Atom)),
	send(regex('([,|])'), for_all, Breakable,
		   message(@arg1, replace, @arg2, '\\1 ')).

type_default(T, C) -->
	{ get(T, supers, Supers), Supers \== @nil,
	  send(Supers, member, type(default))
	}, !,
	[ C ].
type_default(_, _) -->
	[].

type_nil(T) -->
	{ get(T, supers, Supers), Supers \== @nil,
	  send(Supers, member, type(nil))
	}, !,
	[ '*' ].
type_nil(_) -->
	[].

type_vector(T) -->
	{ get(T, vector, @on)
	}, !,
	[ '...' ].
type_vector(_) -->
	[].
       
type_supers(T) -->
	{ get(T, supers, Supers), Supers \== @nil,
	  chain_list(Supers, L)
	}, !,
	t_supers(L).
type_supers(_) -->
	[].

t_supers([]) -->
	[].
t_supers([H|T]) -->
	(   { get(H, name, nil)
	    ; get(H, name, default)
	    }
	->  []
	;   ['|'],
	    type(H)
	),
	t_supers(T).
