(******************************************************************************)
(*  SXSI : XPath evaluator                                                    *)
(*  Kim Nguyen (Kim.Nguyen@nicta.com.au)                                      *)
(*  Copyright NICTA 2008                                                      *)
(*  Distributed under the terms of the LGPL (see LICENCE)                     *)
(******************************************************************************)

open Ata
INCLUDE "utils.ml"
let () = init_timer();;

let enabled_gc = Gc.get()
let disabled_gc = { Gc.get() with
		      Gc.max_overhead = 1000000; 
		      Gc.space_overhead = 100 }
let hash x = 131*x/(x-1+1)

let test_loop tree tag =
  let t' = Tree.tagged_descendant tree tag  Tree.root in
  let f = Hashtbl.create 4096
  in
  let jump t _ =  Tree.tagged_following_below tree tag t Tree.root in
  let g t ctx = 
    if t == Tree.nil then 0
    else 1+ ((Hashtbl.find f (hash 101)) (jump t ctx) ctx)
  in
  Hashtbl.add f (hash 101) g;
  (Hashtbl.find f (hash 101)) t' Tree.root

let test_full tree = 
  let root = Tree.root in
  let fin = Tree.closing tree root in
  let rec loop t = if t <= fin then
  let tag = Tree.tag tree t in
(*  let _ = Tag.to_string tag in *)
  if tag == Tag.pcdata then (ignore (Tree.get_text tree t)); 
  let t = (Obj.magic ((Obj.magic t) + 1)) in
  loop t
  in
  loop root


let test_loop2 tree tag =
  let t' = Tree.tagged_descendant tree tag  Tree.root in
  let f = Hashtbl.create 4096
  in
  let jump t _ =  Tree.tagged_following_below tree tag t Tree.root in
  let rec g t ctx = 
    if t == Tree.nil then 0
    else 1+ (match (Hashtbl.find f (hash 101)) with
		`Foo ->g (jump t ctx) ctx
	    ) 
  in
  Hashtbl.add f (hash 101) `Foo;
  g t' Tree.root

type pointers
external build_pointers : Tree.t -> pointers = "caml_build_pointers"
external iter_pointers : pointers -> int = "caml_iter_pointers"
external free_pointers : pointers -> unit = "caml_free_pointers"


let main v query_string output =
 
    let _ = Tag.init (Tree.tag_pool v) in
      Printf.eprintf "Parsing query : ";    
      let query = try
	time
	  XPath.Parser.parse_string query_string
      with
	  Ulexer.Loc.Exc_located ((x,y),e) -> Printf.eprintf "character %i-%i %s\n" x y (Printexc.to_string e);exit 1
      in
      let _ = Printf.eprintf "Number of nodes %i\n%!" (Tree.size v) in
(*      let _ = Tree.stats v in
      let _ = Printf.eprintf "Timing first_child/next_sibling %!" in
      let _ = time (Tree.benchmark_fcns)  v in
      let _ = Printf.eprintf "Timing last_child/prev_sibling %!" in
      let _ = time (Tree.benchmark_lcps)  v in
      let _ = Printf.eprintf "Timing jump to a %!" in
      let _ = time (Tree.benchmark_jump v) (Tag.tag "a")  in      
      let _ = Printf.eprintf "Timing pointer allocation %!" in
      let pointers = time (build_pointers) v  in
      let _ = Printf.eprintf "Timing pointer iteration %!" in
      let i = time (iter_pointers) pointers  in
      let _ = Printf.eprintf "Traversed %i pointers\n\nTiming pointer deallocation %!" i in
      let _  = time (free_pointers) pointers  in *)
(*      let _ = Printf.eprintf "Timing //keyword :" in
      let r = time (test_loop v) (Tag.tag "keyword") in
      let _ = Printf.eprintf "Count is %i\n%!" r in 
      let _ = Printf.eprintf "Timing //keyword 2:" in
      let r = time (test_loop2 v) (Tag.tag "keyword") in
      let _ = Printf.eprintf "Count is %i\n%!" r in  
      let _ = Printf.eprintf "Timing //node() :" in
      let _ = time (test_full)  v in      *)
      XPath.Ast.print Format.err_formatter query;
      Format.fprintf Format.err_formatter "\n%!";
      Printf.eprintf "Compiling query : ";
      let auto,ltags,contains = time (XPath.Compile.compile ~querystring:query_string) query in 
      let _ = Ata.dump Format.err_formatter auto in
      let _ = Printf.eprintf "%!" in
      let jump_to = 
	match contains with
	   None -> (max_int,`NOTHING)
	  | Some ((op,s)) -> 
	      let r = Tree.count v s 
	      in
	      Printf.eprintf "%i documents in the TextCollection\n" (Tree.text_size v);
	      Printf.eprintf "Global count is %i, using " r;
	      if r < !Options.tc_threshold then begin		  
		Printf.eprintf "TextCollection contains\nCalling global contains : ";
		time (Tree.init_textfun op v) s;
	      end
	      else begin
		Printf.eprintf "Naive contains\nCalling global contains : ";
		time (Tree.init_naive_contains v) s
	      end;(r,`CONTAINS(s))
      in
      let test_list = jump_to in
      (*
	let test_list = 
	if (!Options.backward) then begin
	Printf.eprintf "Finding min occurences : ";
	time 
	( List.fold_left (fun ((min_occ,kind)as acc)  (tag,_) ->
			      let numtags = Tree.subtree_tags v tag Tree.root in
				if  ((numtags < min_occ) && numtags >= 2)
				then (numtags,`TAG(tag))
				else acc) jump_to) ltags
	  end
	  else (max_int,`NOTHING)
	in*)
	let _ = if (snd test_list) != `NOTHING then
	  let occ,s1,s2 = match test_list with
	    | (x,`TAG (tag)) -> (x, "tag", (Tag.to_string tag))
	    | (x,`CONTAINS(s)) -> (x, "contains()", s)
	    | _ -> assert false
	  in
	    Printf.eprintf "Will jump to %s %s occuring %i time\n%!" s1 s2 occ
	in
	  Printf.eprintf "Execution time %s : "
	    (if !Options.count_only then "(counting only)" else if !Options.backward then "(bottomup)" else "");
	  begin
	    let _ = Gc.full_major();Gc.compact() in
	    let _ = Printf.eprintf "%!" in
(*	    let _ = Gc.set (disabled_gc) in *)
	      if !Options.backward && ((snd test_list) != `NOTHING )then 
		if !Options.count_only then
		let r = time_mem (bottom_up_count auto v )(snd test_list)  in
		let _ = Printf.eprintf "Number of nodes in the result set : %i\n%!" r 
		in ()
		else begin
		let r = time_mem (bottom_up auto v )(snd test_list)  in
		let _ = Printf.eprintf "Number of nodes in the result set : %i\n%!" (IdSet.length r)
		in
		  match output with

		    | None -> ()
		    | Some f ->		      
			Printf.eprintf "Serializing results : ";
			time( fun () ->
				(*let oc = open_out f in *)
				let oc = Unix.openfile f [ Unix.O_WRONLY;Unix.O_TRUNC;Unix.O_CREAT] 0o644 in
				(*output_string oc "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";*)
				IdSet.iter (fun t -> 
					      Tree.print_xml_fast3 v t oc;
					      (*output_char oc '\n'; *)				
					   ) r) ();
		end
		     
	      else
		let _ = 
		  if !Options.backward then Printf.eprintf "WARNING: couldn't find a jumping point, running top-down\n" 
		in
		if !Options.count_only then
		  let r = time_mem ( top_down_count auto ) v in 
		  let _ = Printf.eprintf "Number of nodes in the result set : %i\n%!" r
		  in ()
		else      
		let module GR = Ata.Test(struct let doc = v end) in
		  let result = time_mem (GR.top_down auto) v in
		  let _ = Printf.eprintf "Counting results " in
		  let rcount = time (GR.Results.length) result in
	      	    Printf.eprintf "Number of nodes in the result set : %i\n" rcount;
		    Printf.eprintf "\n%!";
		    begin
 		      match output with
			| None -> ()
			| Some f ->		      
			    Printf.eprintf "Serializing results : ";
			    time( fun () ->
				    (*let oc = open_out f in *)
				    let oc = Unix.openfile f [ Unix.O_WRONLY;Unix.O_TRUNC;Unix.O_CREAT] 0o644 in
				      (*output_string oc "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";*)
				    let t1 = ref (Unix.gettimeofday()) in
				    let count = ref 1 in
				    let old_count = ref 1 in
				     GR.Results.iter (fun t -> 
							incr count;
							begin
							  if (!count mod 15) == 0
							  then
							  let t2 =  Unix.gettimeofday() in
							  let _ = Printf.eprintf "Printing %i elements in %f ms\n"
							    (!count - !old_count) (1000. *.(t2 -. !t1))
							  in
							  ( old_count := !count; t1 := Unix.gettimeofday())
							end;
							Tree.print_xml_fast3 v t oc;
							(*output_char oc '\n'; *)				
						     ) result) ();
		    end;
	  end;
	  let _ = Gc.set enabled_gc in
	    Printf.eprintf "Total running time : %fms\n%!" (total_time())
;;

Options.parse_cmdline();;

let v =
  if (Filename.check_suffix !Options.input_file ".srx")
  then 
    begin
      Printf.eprintf "Loading from file : ";
      time (Tree.load  ~sample:!Options.sample_factor ~load_text:(not !Options.count_only))
	!Options.input_file;
	end
  else 
    let v = 
      time (fun () -> let v = Tree.parse_xml_uri !Options.input_file;
	    in Printf.eprintf "Parsing document : %!";v
	   ) () 
    in
      if !Options.save_file <> ""
      then begin
	Printf.eprintf "Writing file to disk : ";
	time (Tree.save v) !Options.save_file;
      end;
      v
in
  main v !Options.query !Options.output_file;;