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

open Ata

let l = ref [] ;;
let time f x =
  let t1 = Unix.gettimeofday () in
  let r = f x in
  let t2 = Unix.gettimeofday () in 
  let t = (1000. *. (t2 -. t1)) in
    l:= t::!l;
    Printf.eprintf "  %fms\n%!" t ;
    r
;;
let total_time () =  List.fold_left (+.) 0. !l;;
let enabled_gc = Gc.get()
let disabled_gc = { Gc.get() with
		      Gc.max_overhead = 1000000; 
		      Gc.space_overhead = 100 }

let main v query output =
    let _ = Tag.init (Tree.tag_pool v) in
      Printf.eprintf "Parsing query : ";    
      let query = try
	time
	  XPath.Parser.parse_string query
      with
	  Ulexer.Loc.Exc_located ((x,y),e) -> Printf.eprintf "character %i-%i %s\n" x y (Printexc.to_string e);exit 1
      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  query in 
	let _ = Ata.dump Format.err_formatter auto in
	let _ = Printf.eprintf "%!" in
	  
	let do_contains = match contains with
	    None -> false
	  | Some 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\nTiming call to raw global contains (1st time): ";
		  time (Tree.unsorted_contains v) s;		  
		  Printf.eprintf "Calling global contains : ";
		  time (Tree.init_contains v) s;
		  Printf.eprintf "Timing call to global count contains : ";
		  let r = time (Tree.count_contains v) s
		  in
		    Printf.eprintf " number of matching nodes %i \n%!" r;
		    Printf.eprintf "Timing call to raw global contains (2nd time): ";
		    time (Tree.unsorted_contains v) s;
		end
		else begin
		  Printf.eprintf "Naive contains\nCalling global contains : ";
		  time (Tree.init_naive_contains v) s
		end;true
	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 _ = Gc.set (disabled_gc) in 
	      if !Options.backward then
		let tag,set = List.hd ltags in
		let r = if do_contains 
		then time (bottom_up_count_contains auto) v
		else time (bottom_up_count auto v) tag in
		let _ = Printf.eprintf "Number of nodes in the result set : %i\n%!" r 
		in ()
	      else
		if !Options.count_only then
		  let r = time ( top_down_count auto ) v in (* not clean *)
	      let _ = Printf.eprintf "Number of nodes in the result set : %i\n%!" r
	      in ()
	    else      
	      let result = time (top_down auto) v in	  
	      let rcount = IdSet.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
				output_string oc "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";				
				IdSet.iter (fun t -> 
					      Tree.print_xml_fast oc t;
					      output_char oc '\n';
					      output_string oc "----------\n";
					   ) result) ();
	      end;
	  end;
	  let _ = Gc.set enabled_gc in
(*	  let _ = Ata.dump Format.err_formatter auto 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 )
    (Filename.chop_suffix !Options.input_file ".srx");
	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;;

IFDEF DEBUG
THEN
Printf.eprintf "\n=================================================\nDEBUGGING\n%!";

Tree.DEBUGTREE.print_stats Format.err_formatter;;
Gc.full_major()
ENDIF