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module Parser = Rdf_turtle.Parser
module Turtle = Rdf_turtle.Ast

open Turtle
open Alcotest

(* TODO The following four functions create a 'testable' for the graph type.
 * Usually, this testable is located in another file: rdf_alcotest,
 * but since I'm not sure at all wheteher the 'equal' function for graphs is
 * a reasonable one, and the pp function is also rather ad hoc, I put it here.
 * It would be nice to have a good implementation for the equal function.
 * Right now, it first transforms the graph into a list of tiples, and then
 * checks whether the lists are equal up to ordering. This list_equal_up_to_order
 * function is also used in the test file for rdf_json. *)

(* Check whether two lists have the same elements *)
let list_equal_up_to_order equal l1 l2 =
  (l1 |> List.fold_left
     (fun acc y ->
        if not acc then false
        else if not (List.exists (fun x -> equal y x) l2) then false
        else true)
     true)
  &&
  (l2 |> List.fold_left
     (fun acc y ->
        if not acc then false
        else if not (List.exists (fun x -> equal y x) l1) then false
        else true)
     true)

let graph_equal g1 g2 =
  let graph_to_list g =
    g
    |> Rdf.Graph.to_triples
    |> List.of_seq
  in
  list_equal_up_to_order Rdf.Triple.equal (graph_to_list g1) (graph_to_list g2)

let graph_pp ppf g =
  Fmt.pf ppf "%s" (Rdf_turtle.encode g)

let graph_testable = Alcotest.testable graph_pp graph_equal

let parse p =
  Angstrom.parse_string
    ~consume:Angstrom.Consume.All
    p

let iriref_test_case =
  let cases = [
    "<http://one.example/subject1>",
    Iriref.of_string "http://one.example/subject1" ;
  ] in
  test_case "iriref" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_iriref string)
              "can parse"
              (parse Parser.iriref enc)
              (Result.ok @@ v))
         cases)

let language_test_case =
  test_case "language" `Quick
    (fun () ->
       check (result Rdf_alcotest.ast_language string)
         "can parse"
         (parse Parser.language "@fr-be")
         (Result.ok @@ Language.of_string "fr-be")
    )

let prefixed_name_test_case =
  let cases = [
    "rdf:first",
    Prefixed_name.of_strings "rdf" "first" ;
    ":first",
    Prefixed_name.of_strings "" "first" ;
  ] in
  test_case "prefixed_name" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_prefixed_name string)
              "can parse"
              (parse Parser.prefixed_name enc)
              (Result.ok @@ v))
         cases)

let blank_node_test_case =
  test_case "blank_node" `Quick
    (fun () ->
       check (result Rdf_alcotest.ast_blank_node string)
         "can parse"
         (parse Parser.blank_node "_:alice")
         (Result.ok @@ Blank_node.of_string "alice")
    )

let iri_test_case =
  let cases = [
    "<http://one.example/subject1>",
    Iri.of_iriref @@ Iriref.of_string "http://one.example/subject1" ;
    "p:subject3",
    Iri.of_prefixed_name @@ Prefixed_name.of_strings "p" "subject3" ;
  ] in
  test_case "iri" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_iri string)
              "can parse"
              (parse Parser.iri enc)
              (Result.ok @@ v))
         cases)

let literal_test_case =
  let cases = [
    "\"That Seventies Show\"^^xsd:string",
    Literal.make
      ("That Seventies Show")
      (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string") ;
    "\"That Seventies Show\"^^<http://www.w3.org/2001/XMLSchema#string>",
    Literal.make
      ("That Seventies Show")
      (Iri.of_iriref @@ Iriref.of_string "http://www.w3.org/2001/XMLSchema#string");
    "\"That Seventies Show\"",
    Literal.make
      ("That Seventies Show")
      (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string") ;
    "\"Cette Série des Années Septantei\"@fr-be",
    Literal.make
      "Cette Série des Années Septantei"
      (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")
      ~language:"fr-be" ;
  ] in
  test_case "literal" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_literal string)
              "can parse"
              (parse Parser.literal enc)
              (Result.ok @@ v))
         cases)

let predicate_test_case =
  let cases = [
    "<http://one.example/subject1>",
    Predicate.of_iri @@ Iri.of_iriref @@ Iriref.of_string "http://one.example/subject1" ;
    "p:subject3",
    Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "p" "subject3" ;
  ] in
  test_case "predicate" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_predicate string)
              "can parse"
              (parse Parser.predicate enc)
              (Result.ok @@ v))
         cases)

let object_test_case =
  let cases = [
    (* Literal *)
    "\"That Seventies Show\"^^xsd:string",
    Literal.make
      ("That Seventies Show")
      (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")
    |> (fun lit -> Obj_literal lit) ;
    (* Iri *)
    "xsd:string",
    Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string"
    |> (fun iri -> Obj_iri iri) ;
    (* Iri *)
    ":q",
    Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "q"
    |> (fun iri -> Obj_iri iri) ;
    (* Blank_node *)
    "_:string",
    Obj_blank_node (Blank_node.of_string "string") ;
    (* Blank_node *)
    "_:string",
    Obj_blank_node (Blank_node.of_string "string") ;
    (* Collection *)
    "( \"apple\" \"banana\" )",
    Obj_coll (
      Collection (
        [
          Obj_literal (
            Literal.make
              ("apple")
              (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")) ;
          Obj_literal (
            Literal.make
              ("banana")
              (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")) ;
        ]
      )
    ) ;
    (*  BNodePlist *)
    "[ foaf:name \"Bob\" ]",
    Obj_bnodps (BnodPs ([ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "foaf" "name",
      [ Obj_literal ( Literal.make
                               ("Bob")
                               (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string"))
      ]
    ]))
    ;
  ] in
  test_case "object" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_object string)
              "can parse"
              (parse Parser.object' enc)
              (Result.ok @@ v))
         cases)

let bnodps_test_case =
  let cases = [
    "[ foaf:name \"Bob\" ]",
    BnodPs ([ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "foaf" "name",
              [ Obj_literal ( Literal.make
                                ("Bob")
                                (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string"))
              ]
            ])
    ;
    "[:p :WWWW]",
    BnodPs ([ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "p",
              [ Obj_iri (Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "WWWW"); ] ; ]
           );
  ]
  in
  test_case "bnodps" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_bnodps string)
              "can parse"
              (parse Parser.bnodps enc)
              (Result.ok @@ v))
         cases)

let predobjs_test_case =
  let cases = [
    ":p :WWWWWWWWWWWWWWWWWWWwwW",
    [ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "p",
              [ Obj_iri (Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "WWWWWWWWWWWWWWWWWWWwwW"); ] ; ]
    ;
    " foaf:name \"Bob\" ",
    [ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "foaf" "name",
      [ Obj_literal ( Literal.make
                               ("Bob")
                               (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string"))
      ]
    ]
    ;
    "rel:enemyOf <#green-goblin> ;
        a foaf:Person ;
            foaf:name \"Spiderman\", \"Человек-паук\"@ru",
    [ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "rel" "enemyOf",
      [ Obj_iri ( Iri.of_iriref (Iriref.of_string "#green-goblin"));]
      ;
      Predicate.a,
      [ Obj_iri (Iri.of_prefixed_name @@ Prefixed_name.of_strings "foaf" "Person");]
      ;
      Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "foaf" "name",
      [  Obj_literal ( Literal.make
                               ("Spiderman")
                               (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string"));
        Obj_literal ( Literal.make
                               ("Человек-паук")
                               (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")
                               ~language:"ru");
      ]
    ] ;
(*     "<http://www.perceive.net/schemas/relationship/enemyOf> \"LITERAL\" ",  *)
(*     "<http://www.perceive.net/schemas/relationship/enemyOf> .", *)
(*     [ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "p", *)
(*               [ Obj_iri (Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "WWWWWWWWWWWWWWWWWWWwwW"); ] ; ] *)
(*       ; *)
  ] in
  test_case "predobjs" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_predobjs string)
              "can parse"
              (parse Parser.predobjs enc)
              (Result.ok @@ v))
         cases)

let subject_test_case =
  let cases = [
  (*  Iri *)
    "<http://one.example/>",
    Sub_iri (Iri.of_iriref (Iriref.of_string "http://one.example/"));
  (*  Collection *)
    "(\"1\" [:p :q] ( \"2\" ) )",
    Sub_coll (
      Collection (
        [
          Obj_literal (
            Literal.make
              ("1")
              (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")) ;
          Obj_bnodps (
            BnodPs (
              [ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "p",
                [ Obj_iri (Iri.of_prefixed_name @@ Prefixed_name.of_strings "" "q"); ] ; ]
            )
          ) ;
          Obj_coll (
            Collection (
              [ Obj_literal (
                  Literal.make
                    ("2")
                    (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")) ;
              ]
            )
          )
        ]
      )
    ) ;
  ] in
  test_case "subject" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_subject string)
              "can parse"
              (parse Parser.subject enc)
              (Result.ok @@ v))
         cases)

let triple_test_case =
  let cases = [
    "<http://example.org/#spiderman> <http://www.perceive.net/schemas/relationship/enemyOf> <http://example.org/#green-goblin>",
    Triple.of_subject_and_predobjs
      (Sub_iri (Iri.of_iriref (Iriref.of_string @@ "http://example.org/#spiderman")))
      ([ Predicate.of_iri @@ Iri.of_iriref "http://www.perceive.net/schemas/relationship/enemyOf",
          [ Obj_iri (Iri.of_iriref "http://example.org/#green-goblin"); ] ; ])
    ;
(*     TODO why does this test fail? *)
(*     "[ foaf:name \"Bob\" ]", *)
(*     Triple.of_bnodps ( *)
(*       BnodPs ([ Predicate.of_iri @@ Iri.of_prefixed_name @@ Prefixed_name.of_strings "foaf" "name", *)
(*                 [ Obj_literal ( Literal.make *)
(*                                   ("Bob") *)
(*                                   (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")) *)
(*                 ] *)
(*               ])) *)
(*     ; *)
  ] in
  test_case "triple" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_triple string)
              "can parse"
              (parse Parser.triple enc)
              (Result.ok @@ v))
         cases)

let directive_test_case =
  let cases = [
    "@base <http://one.example/>",
    Directive.of_iriref (Iriref.of_string "http://one.example/")
    ;
    "@prefix foaf: <http://xmlns.com/foaf/0.1/>   ",
    Directive.of_string_and_iriref
      "foaf"
      (Iriref.of_string "http://xmlns.com/foaf/0.1/")
    ;
  ] in
  test_case "directive" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_directive string)
              "can parse"
              (parse Parser.directive enc)
              (Result.ok @@ v))
         cases)

let statement_test_case =
  let cases = [
    "@prefix foaf: <http://xmlns.com/foaf/0.1/> .",
    Statement.of_directive (
      Directive.of_string_and_iriref
      "foaf"
      (Iriref.of_string "http://xmlns.com/foaf/0.1/"))
    ;
    "<http://example.org/#spiderman>
    <http://www.perceive.net/schemas/relationship/enemyOf> <http://example.org/#green-goblin> .",
    Statement.of_triple (
      Triple.of_subject_and_predobjs
        (Sub_iri (Iri.of_iriref (Iriref.of_string @@ "http://example.org/#spiderman")))
        ([ Predicate.of_iri @@ Iri.of_iriref "http://www.perceive.net/schemas/relationship/enemyOf",
           [ Obj_iri (Iri.of_iriref "http://example.org/#green-goblin"); ] ; ]))
    ;
(*     "<http://example.org/#spiderman> <http://www.perceive.net/schemas/relationship/enemyOf> \"literal\" .", *)
    "<http://example.org/#spiderman>
    <http://www.perceive.net/schemas/relationship/enemyOf> <http://example.org/#green-goblin> .",
    Statement.of_triple (
      Triple.of_subject_and_predobjs
        (Sub_iri (Iri.of_iriref (Iriref.of_string @@ "http://example.org/#spiderman")))
        ([ Predicate.of_iri @@ Iri.of_iriref "http://www.perceive.net/schemas/relationship/enemyOf",
           [ Obj_iri (Iri.of_iriref "http://example.org/#green-goblin"); ] ; ]))
    ;
    "<http://example.org/#spiderman> <http://www.perceive.net/schemas/relationship/enemyOf> \"literal\" .",
    Statement.of_triple (
      Triple.of_subject_and_predobjs
        (Sub_iri (Iri.of_iriref (Iriref.of_string @@ "http://example.org/#spiderman")))
        ([ Predicate.of_iri @@ Iri.of_iriref "http://www.perceive.net/schemas/relationship/enemyOf",
           [ Obj_literal ( Literal.make
                             "literal"
                             (Iri.of_prefixed_name @@ Prefixed_name.of_strings "xsd" "string")
                         )]]))
    ;
  ] in
  test_case "statement" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_statement string)
              "can parse"
              (parse Parser.statement enc)
              (Result.ok @@ v))
         cases)

let turtle_test_case =
  let cases = [
    "@prefix foaf: <http://xmlns.com/foaf/0.1/> .",
    Turtle.of_statement_lst (
      [Statement.of_directive (
          Directive.of_string_and_iriref
            "foaf"
            (Iriref.of_string "http://xmlns.com/foaf/0.1/"))])
    ;
    "<http://example.org/#spiderman> <http://www.perceive.net/schemas/relationship/enemyOf> <http://example.org/#green-goblin> .",
    Turtle.of_statement_lst (
      [Statement.of_triple (
          Triple.of_subject_and_predobjs
            (Sub_iri (Iri.of_iriref (Iriref.of_string @@ "http://example.org/#spiderman")))
            ([ Predicate.of_iri @@ Iri.of_iriref "http://www.perceive.net/schemas/relationship/enemyOf",
               [ Obj_iri (Iri.of_iriref "http://example.org/#green-goblin"); ] ; ]))])
    ;
    "@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix show: <http://example.org/vocab/show/> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .",
    Turtle.of_statement_lst (
      [ Statement.of_directive (
          Directive.of_string_and_iriref
            "rdfs"
            (Iriref.of_string "http://www.w3.org/2000/01/rdf-schema#"))
      ;
        Statement.of_directive (
          Directive.of_string_and_iriref
            "show"
            (Iriref.of_string "http://example.org/vocab/show/"))
      ;
        Statement.of_directive (
          Directive.of_string_and_iriref
            "xsd"
            (Iriref.of_string "http://www.w3.org/2001/XMLSchema#"))
      ])
    ;
  ] in
  test_case "turtle" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (result Rdf_alcotest.ast_turtle string)
              "can parse"
              (parse Parser.turtle enc)
              (Result.ok @@ v))
         cases)

(* TODO This test works as follows: we take a turtle string and create a graph out of it using rdf_turtle.decode,
 * which is the composition of the turtle parser, and the transformation which transforms instances of the turtle type into a graph.
 * We compare the result to a graph which the empty graph with a number of triples added.
 * We have some helper functions to reduce the amount of code.
 * One issue with this approach is, is that when there are tests that don't pass. it is not
 * immediately clear where the problems lie, since the decode function is a composition of other
 * (already quite complicated) funtions. *)
let turtle_to_graph_test_case =
  let triple_of_iris_of_strs sub pred obj =
    (Rdf.Triple.make
       (Rdf.Triple.Subject.of_iri @@ Rdf.Iri.of_string sub)
       (Rdf.Triple.Predicate.of_iri @@ Rdf.Iri.of_string pred)
       (Rdf.Triple.Object.of_iri @@ Rdf.Iri.of_string obj))
  in
  let cases = [
    "<sub> <pred> <obj> .",
    Rdf.Graph.add Rdf.Graph.empty
      (triple_of_iris_of_strs "sub" "pred" "obj")
    ;
  ] in
  test_case "turtle parser and transform" `Quick
    (fun () ->
       List.iter
         (fun (enc, v) ->
            check (graph_testable)
              "can parse and transform"
              (Rdf_turtle.decode enc)
              (v))
         cases)

let () =
  Alcotest.run "Turtle" [
    "Turtle parsers", [
      iriref_test_case;
      language_test_case;
      prefixed_name_test_case;
      blank_node_test_case;
      iri_test_case;
      literal_test_case;
      predicate_test_case;
      object_test_case;
      bnodps_test_case;
      predobjs_test_case;
      subject_test_case;
      triple_test_case;
      directive_test_case;
      statement_test_case;
      turtle_test_case;
      turtle_to_graph_test_case;
    ]
  ]