(********************************************************************)
(*                                                                  *)
(*  The Why3 Verification Platform   /   The Why3 Development Team  *)
(*  Copyright 2010-2022 --  Inria - CNRS - Paris-Saclay University  *)
(*                                                                  *)
(*  This software is distributed under the terms of the GNU Lesser  *)
(*  General Public License version 2.1, with the special exception  *)
(*  on linking described in file LICENSE.                           *)
(*                                                                  *)
(********************************************************************)

open Format
open Why3
open Why3session_lib

module Hprover = Whyconf.Hprover
module S = Session_itp

let output_dir = ref ""
let opt_context = ref false

type style = SimpleTree | Table

let opt_style = ref Table
let default_style = "table"

let set_opt_style = function
  | "simpletree" -> opt_style := SimpleTree
  | "table" -> opt_style := Table
  | _ ->
    eprintf "Unknown html style, ignored@."

let () = set_opt_style default_style

let opt_pp = ref []

let spec =
  let open Getopt in
  [ KShort 'o', Hnd1 (AString, fun s -> output_dir := s),
    "<dir> set output directory ('-' for stdout)";
    KLong "context", Hnd0 (fun () -> opt_context := true),
    " add context around the generated HTML code";
    KLong "style", Hnd1 (ASymbol ["simpletree"; "table"], set_opt_style),
    "[simpletree|table] style to use (default: '" ^ default_style ^ "')";
    KLong "add_pp", Hnd1 (APair (',', AString, APair (',', AString, AString)),
      fun (suf, (cmd, out)) -> opt_pp := (suf, (cmd, out)) :: !opt_pp),
    "<suffix>,<cmd>,<out_suffix> declare a pretty-printer for edited\nproofs";
    KLong "coqdoc", Hnd0
      (fun () -> opt_pp := (".v",("coqdoc --no-index --html -o %o %i",".html"))::!opt_pp),
    " use coqdoc to print Coq proofs";
  ]

open Session_itp

let run_file print_session fname =
  let ses = read_session fname in
  let project_dir = get_dir ses in
  let output_dir =
    if !output_dir = "" then project_dir else !output_dir
  in
  let basename = Filename.basename project_dir in
  let cout =
    if output_dir = "-" then stdout else
      open_out (Filename.concat output_dir ("why3session.html"))
  in
  let fmt = formatter_of_out_channel cout in
  if !opt_context then
    fprintf fmt
      "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \
         \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\
     \n<html xmlns=\"http://www.w3.org/1999/xhtml\">\
     \n<head>\
     \n  <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\
     \n  <title>Why3 session of %s</title>\
     \n</head>\
     \n<body>\
     \n" basename;
  print_session basename fmt ses;
  if !opt_context then
    pp_print_string fmt "\n</body>\n</html>\n";
  pp_print_flush fmt ();
  if output_dir <> "-" then close_out cout


module Table =
struct

  let print_prover = Whyconf.print_prover


  let color_of_status ?(dark=false) fmt b =
    pp_print_string fmt (if b then
        if dark then "008000" else "C0FFC0"
      else "FF0000")

let print_results fmt s provers proofs =
  List.iter (fun p ->
    fprintf fmt "<td style=\"background-color:#";
    begin
      try
        let pr = get_proof_attempt_node s (Hprover.find proofs p) in
        let s = pr.proof_state in
        begin
          match s with
	  | Some res ->
	    begin
	      match res.Call_provers.pr_answer with
		| Call_provers.Valid ->
                  fprintf fmt "C0FFC0\">%.2f" res.Call_provers.pr_time
		| Call_provers.Invalid ->
                  pp_print_string fmt "FF0000\">Invalid"
		| Call_provers.Timeout ->
                  fprintf fmt "FF8000\">Timeout (%ds)"
                    pr.limit.Call_provers.limit_time
		| Call_provers.OutOfMemory ->
                  fprintf fmt "FF8000\">Out Of Memory (%dM)"
                    pr.limit.Call_provers.limit_mem
		| Call_provers.StepLimitExceeded ->
                  pp_print_string fmt "FF8000\">Step limit exceeded"
		| Call_provers.Unknown _ ->
                  fprintf fmt "FF8000\">%.2f" res.Call_provers.pr_time
		| Call_provers.Failure _ ->
                  pp_print_string fmt "FF8000\">Failure"
		| Call_provers.HighFailure ->
                  pp_print_string fmt "FF8000\">High Failure"
	    end
	  | None -> pp_print_string fmt "E0E0E0\">result missing"
        end;
        if pr.S.proof_obsolete then pp_print_string fmt " (obsolete)"
      with Not_found -> pp_print_string fmt "E0E0E0\">---"
    end;
    pp_print_string fmt "</td>") provers

let rec num_lines s acc tr =
  List.fold_left
    (fun acc g -> 1 +
      List.fold_left (fun acc tr -> 1 + num_lines s acc tr)
      acc (get_transformations s g))
    acc (get_sub_tasks s tr)

  let rec print_transf fmt s depth max_depth provers tr =
    pp_print_string fmt "<tr>";
    fprintf fmt "<td style=\"background-color:#%a\" colspan=\"%d\">"
      (color_of_status ~dark:false) (tn_proved s tr)
      (max_depth - depth + 1);
    fprintf fmt "%a</td>" Pp.html_string (get_transf_string s tr);
    for _i=1 to List.length provers do
      fprintf fmt "<td style=\"background-color:#E0E0E0\"></td>"
    done;
    fprintf fmt "</tr>@\n";
    let nl = num_lines s 0 tr in
    if nl > 0 then begin
      fprintf fmt "<tr><td rowspan=\"%d\" style=\"width:1ex\"></td>" nl;
    let (_:bool) = List.fold_left
      (fun needs_tr g ->
        print_goal fmt s needs_tr (depth+1) max_depth provers g;
        true)
      false (get_sub_tasks s tr)
    in ()
    end

  and print_goal fmt s needs_tr depth max_depth provers g =
    if needs_tr then fprintf fmt "<tr>";
    fprintf fmt "<td style=\"background-color:#%a\" colspan=\"%d\">"
      (color_of_status ~dark:false) (pn_proved s g)
      (max_depth - depth + 1);
    fprintf fmt "%a</td>" Pp.html_string (goal_full_name s g);
    print_results fmt s provers (get_proof_attempt_ids s g);
    fprintf fmt "</tr>@\n";
    List.iter
      (print_transf fmt s depth max_depth provers)
      (get_transformations s g)

  let print_theory s fn fmt th =
    let depth = theory_depth s th in
    if depth > 0 then begin
    let provers = get_used_provers_theory s th in
    let provers =
      Whyconf.Sprover.fold (fun pr acc -> pr :: acc) provers []
    in
    let provers = List.sort Whyconf.Prover.compare provers in
    let name =
      try
        let (l,t,_) = Theory.restore_path (theory_name th) in
        String.concat "." ([fn]@l@[t])
      with Not_found -> fn ^ "." ^ (theory_name th).Ident.id_string
    in
    fprintf fmt "<h2><span style=\"color:#%a\">Theory \"%s\": "
      (color_of_status ~dark:true) (th_proved s th)
      name;
    if th_proved s th then
      pp_print_string fmt "fully verified" (*TODO in %%.02f s*)
    else pp_print_string fmt "not fully verified";
    fprintf fmt "</span></h2>@\n";

    fprintf fmt "<table border=\"1\" style=\"border-collapse:collapse\"><tr><td colspan=\"%d\">Obligations</td>" depth;
    List.iter
      (fun pr -> fprintf fmt "<td text-rotation=\"90\">%a</td>" print_prover pr)
      provers;
    fprintf fmt "</tr>@\n";
    List.iter (print_goal fmt s true 1 depth provers) (theory_goals th);
    fprintf fmt "</table>@\n"
    end

  let print_file s fmt f =
    (* fprintf fmt "<h1>File %s</h1>@\n" f.file_name; *)
    let fn = Sysutil.basename (file_path f) in
    let fn = Filename.chop_extension fn in
    Pp.print_list Pp.newline (print_theory s fn) fmt (file_theories f)

  let print_session name fmt s =
    fprintf fmt "<h1>Why3 Proof Results for Project \"%s\"</h1>@\n" name;
    Pp.print_iter2 Hfile.iter Pp.newline Pp.nothing Pp.nothing (print_file s) fmt (get_files s)

end

module Simple =
struct

  let print_prover = Whyconf.print_prover

  let print_proof_status fmt = function
    | None -> pp_print_string fmt "No result"
    | Some res -> fprintf fmt "@[<h>Done: %a@]"
                    (Call_provers.print_prover_result ~json:false) res

  let print_proof_attempt s fmt pa =
    let pa = get_proof_attempt_node s pa in
    fprintf fmt "<li>%a : %a</li>"
      print_prover pa.prover
      print_proof_status pa.proof_state

  let print_ul print =
    let start_ul fmt () = pp_print_string fmt " : <ul>" in
    let stop_ul  fmt () = pp_print_string fmt "</ul>" in
    Pp.print_list_delim ~start:start_ul ~sep:Pp.newline ~stop:stop_ul print

  let rec print_transf s fmt tr =
    fprintf fmt "<li>%a%a</li>"
      Pp.html_string (get_transf_string s tr)
      (print_ul (print_goal s)) (get_sub_tasks s tr)

  and print_goal s fmt g =

    fprintf fmt "<li>%a : <ul>%a%a</ul></li>"
      Pp.html_string (goal_full_name s g)
      (Pp.print_iter2 Hprover.iter Pp.newline Pp.nothing
         Pp.nothing (print_proof_attempt s))
      (get_proof_attempt_ids s g)
      (Pp.print_iter1 List.iter Pp.newline (print_transf s))
      (get_transformations s g)

  let print_theory s fmt th =
    fprintf fmt "<li>%s%a</li>"
      (theory_name th).Ident.id_string
      (print_ul (print_goal s)) (theory_goals th)

  let print_file s fmt f =
    fprintf fmt "<li>%a%a</li>"
      Sysutil.print_file_path (file_path f)
      (print_ul (print_theory s)) (file_theories f)

  let print_session _name fmt s =
    fprintf fmt "<ul>%a</ul>"
      (Pp.print_iter2 Hfile.iter Pp.newline Pp.nothing Pp.nothing
         (print_file s)) (get_files s)

end


let run () =
  let _,_ = Whyconf.Args.complete_initialization () in
  match !opt_style with
    | Table -> iter_files (run_file Table.print_session)
    | SimpleTree -> iter_files (run_file Simple.print_session)

let cmd =
  { cmd_spec = spec;
    cmd_desc = "output session in HTML format";
    cmd_name = "html";
    cmd_run  = run;
  }


(*
Local Variables:
compile-command: "unset LANG; make -C ../.. bin/why3session.byte"
End:
*)
