(*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *)

open OUnit2
open Layout_test_utils
open Layout_generator_test_utils
module S = Ast_builder.Statements
module E = Ast_builder.Expressions
module T = Ast_builder.Types
module L = Layout_builder

let opts = Js_layout_generator.default_opts

let variable_declaration =
  S.const_declaration [S.variable_declarator ~init:(E.Literals.string "x") "x"]

let void_annotation = Flow_ast.Type.Available (T.annotation (T.void ()))

let type_params = T.type_params [T.type_param "T"]

let comments =
  {
    Flow_ast.Syntax.leading = [Ast_builder.Comments.block "leading"];
    trailing = [Ast_builder.Comments.line "trailing"];
    internal = ();
  }

let tests =
  [
    ( "simple_component" >:: fun ctxt ->
      let body = (Loc.none, { Flow_ast.Statement.Block.body = []; comments = None }) in
      let ast = S.component_declaration "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "component Comp(){}" layout;
      assert_output ~ctxt ~pretty:true "component Comp() {}" layout
    );
    ( "component_with_body" >:: fun ctxt ->
      let body =
        (Loc.none, { Flow_ast.Statement.Block.body = [variable_declaration]; comments = None })
      in
      let ast = S.component_declaration "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "component Comp(){const x=\"x\"}" layout;
      assert_output ~ctxt ~pretty:true "component Comp() {\n  const x = \"x\";\n}" layout
    );
    ( "component_with_renders" >:: fun ctxt ->
      let body = (Loc.none, { Flow_ast.Statement.Block.body = []; comments = None }) in
      let renders = Some (Flow_ast.Type.Available (T.annotation @@ T.mixed ())) in
      let ast = S.component_declaration ~tparams:type_params ?renders "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "component Comp<T>() renders mixed{}" layout;
      assert_output ~ctxt ~pretty:true "component Comp<T>() renders mixed {}" layout
    );
    ( "component_with_comments" >:: fun ctxt ->
      let body = (Loc.none, { Flow_ast.Statement.Block.body = []; comments = None }) in
      let ast = S.component_declaration ~comments "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "/*leading*/component Comp(){}//trailing\n" layout;
      assert_output ~ctxt ~pretty:true "/*leading*/ component Comp() {} //trailing\n" layout
    );
    ( "component_with_simple_params" >:: fun ctxt ->
      let body = (Loc.none, { Flow_ast.Statement.Block.body = []; comments = None }) in
      let params =
        S.component_params
          [
            S.component_id_param "p1";
            S.component_string_param "p-2" (Ast_builder.Patterns.identifier "p2");
          ]
      in
      let ast = S.component_declaration ~params "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "component Comp(p1,\"p-2\" as p2){}" layout;
      assert_output ~ctxt ~pretty:true "component Comp(p1, \"p-2\" as p2) {}" layout
    );
    ( "component_params_with_defaults" >:: fun ctxt ->
      let body = (Loc.none, { Flow_ast.Statement.Block.body = []; comments = None }) in
      let params =
        S.component_params
          [
            S.component_id_param ~default:(E.Literals.string "default_p1") "p1";
            S.component_string_param
              ~default:(E.Literals.string "default_p2")
              "p-2"
              (Ast_builder.Patterns.identifier "p2");
          ]
      in
      let ast = S.component_declaration ~params "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "component Comp(p1=\"default_p1\",\"p-2\" as p2=\"default_p2\"){}" layout;
      assert_output
        ~ctxt
        ~pretty:true
        "component Comp(p1 = \"default_p1\", \"p-2\" as p2 = \"default_p2\") {}"
        layout
    );
    ( "component_params_id_with_local" >:: fun ctxt ->
      let body = (Loc.none, { Flow_ast.Statement.Block.body = []; comments = None }) in
      let params =
        S.component_params
          [S.component_id_param ~local:(Ast_builder.Patterns.identifier "local_p1") "p1"]
      in
      let ast = S.component_declaration ~params "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "component Comp(p1 as local_p1){}" layout;
      assert_output ~ctxt ~pretty:true "component Comp(p1 as local_p1) {}" layout
    );
    ( "component_params_id_with_rest" >:: fun ctxt ->
      let body = (Loc.none, { Flow_ast.Statement.Block.body = []; comments = None }) in
      let params =
        S.component_params
          ~rest:
            ( Loc.none,
              {
                Flow_ast.Statement.ComponentDeclaration.RestParam.argument =
                  Ast_builder.Patterns.identifier "rest";
                comments = None;
              }
            )
          [S.component_id_param "p1"]
      in
      let ast = S.component_declaration ~params "Comp" body in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "component Comp(p1,...rest){}" layout;
      assert_output ~ctxt ~pretty:true "component Comp(p1, ...rest) {}" layout
    );
    ( "declare_component" >:: fun ctxt ->
      let ast = S.declare_component "Comp" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "declare component Comp();" layout;
      assert_output ~ctxt ~pretty:true "declare component Comp();" layout
    );
    ( "declare_component_with_renders_annot" >:: fun ctxt ->
      let renders = Some (Flow_ast.Type.Available (T.annotation @@ T.mixed ())) in
      let ast = S.declare_component ?renders "Comp" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "declare component Comp() renders mixed;" layout;
      assert_output ~ctxt ~pretty:true "declare component Comp() renders mixed;" layout
    );
    ( "declare_component_with_comments" >:: fun ctxt ->
      let ast = S.declare_component ~comments "Comp" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "/*leading*/declare component Comp();//trailing\n" layout;
      assert_output ~ctxt ~pretty:true "/*leading*/ declare component Comp(); //trailing\n" layout
    );
    ( "declare_component_with_simple_params" >:: fun ctxt ->
      let open Flow_ast.Statement.ComponentDeclaration.Param in
      let params =
        S.component_type_params
          [
            S.component_type_param
              (Identifier (Ast_builder.Identifiers.identifier "p1"))
              (T.annotation @@ T.number ());
            S.component_type_param
              (StringLiteral (Loc.none, Ast_builder.string_literal "p-2"))
              (T.annotation @@ T.void ());
          ]
      in
      let ast = S.declare_component ~params "Comp" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "declare component Comp(p1:number,\"p-2\":void);" layout;
      assert_output ~ctxt ~pretty:true "declare component Comp(p1: number, \"p-2\": void);" layout
    );
    ( "declare_component_with_rest" >:: fun ctxt ->
      let params =
        S.component_type_params
          ~rest:
            ( Loc.none,
              {
                Flow_ast.Type.Component.RestParam.argument =
                  Some (Ast_builder.Identifiers.identifier "rest");
                optional = false;
                annot = T.mixed ();
                comments = None;
              }
            )
          []
      in
      let ast = S.declare_component ~params "Comp" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "declare component Comp(...rest:mixed);" layout;
      assert_output ~ctxt ~pretty:true "declare component Comp(...rest: mixed);" layout
    );
    ( "declare_component_with_optional_rest" >:: fun ctxt ->
      let params =
        S.component_type_params
          ~rest:
            ( Loc.none,
              {
                Flow_ast.Type.Component.RestParam.argument =
                  Some (Ast_builder.Identifiers.identifier "rest");
                optional = true;
                annot = T.mixed ();
                comments = None;
              }
            )
          []
      in
      let ast = S.declare_component ~params "Comp" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "declare component Comp(...rest?:mixed);" layout;
      assert_output ~ctxt ~pretty:true "declare component Comp(...rest?: mixed);" layout
    );
    ( "declare_component_with_param_and_rest" >:: fun ctxt ->
      let open Flow_ast.Statement.ComponentDeclaration.Param in
      let params =
        S.component_type_params
          ~rest:
            ( Loc.none,
              {
                Flow_ast.Type.Component.RestParam.argument = None;
                optional = false;
                annot = T.mixed ();
                comments = None;
              }
            )
          [
            S.component_type_param
              (Identifier (Ast_builder.Identifiers.identifier "p1"))
              (T.annotation @@ T.number ());
          ]
      in
      let ast = S.declare_component ~params "Comp" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt "declare component Comp(p1:number,...mixed);" layout;
      assert_output ~ctxt ~pretty:true "declare component Comp(p1: number, ...mixed);" layout
    );
    (* Tests which include parsing *)
    ( "parse_simple_component" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp() {}"
    );
    ( "parse_component_renders" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp() renders TReturn {}"
    );
    ( "parse_component_comments" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "/* leading */ component Comp() {} // trailing\n"
    );
    ( "parse_component_comments2" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component /* c1 */ Comp() {} /* c2 */"
    );
    ( "parse_component_comments3" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp(/* c1 */) /* c2 */ {}"
    );
    ( "parse_component_comments4" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp() renders TReturn /* c1*/ {// c2
}"
    );
    ( "parse_component_comments5" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp() /* c1 */ renders TReturn {}"
    );
    ( "parse_component_params" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp(p1: T1, p2: T2, ...rest: TRest) {}"
    );
    ( "parse_component_params2" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp(p1 as p11: T1 = \"default\") {}"
    );
    ( "parse_component_params_comments" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "component Comp(p1: T1 /* c1 */) {}"
    );
    ( "parse_component_params_comments2" >:: fun ctxt ->
      assert_statement_string
        ~ctxt
        ~pretty:true
        "component Comp(p1: T1 /* c1 */, p2 /* some */: T2) {}"
    );
    (* TODO: This comment printing is not ideal. However, this needs to also be fixed for functions *)
    ( "parse_component_params_comments3" >:: fun ctxt ->
      let ast = Ast_builder.test_statement_of_string "component Comp(
  p1: T1, // c1
) {}" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt ~pretty:true "component Comp(
  p1: T1 // c1
  ,
) {}" layout
    );
    ( "parse_component_params_comments4" >:: fun ctxt ->
      assert_statement_string
        ~ctxt
        ~pretty:true
        "component Comp(p1 as p11 /* c1 */: T1 /* c1 */ = \"default\") {}"
    );
    ( "parse_component_params_comments5" >:: fun ctxt ->
      assert_statement_string
        ~ctxt
        ~pretty:true
        "component Comp(...rest /* c1 */: TRest /* c2 */) {}"
    );
    ( "parse_declare_component" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "declare component Comp();"
    );
    ( "parse_declare_component_renders" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "declare component Comp() renders TReturn;"
    );
    ( "parse_declare_component_comments" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "/* c1 */ declare component Comp(); // c2\n"
    );
    (* TODO: This comment printing is not ideal. However, this needs to also be fixed for functions *)
    ( "parse_declare_component_comments2" >:: fun ctxt ->
      let ast =
        Ast_builder.test_statement_of_string "declare /* c1 */ component Comp(/* c2 */); /* c3 */"
      in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt ~pretty:true "/* c1 */ declare component Comp(/* c2 */); /* c3 */" layout
    );
    ( "parse_declare_component_comments3" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "declare component /* c1 */ Comp() /* c2 */;"
    );
    ( "parse_declare_component_comments4" >:: fun ctxt ->
      assert_statement_string
        ~ctxt
        ~pretty:true
        "declare component Comp() /* c1 */ renders TReturn; // c2\n"
    );
    ( "parse_declare_component_params" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "declare component Comp(p1: T1, p2: T2, ...TRest);"
    );
    ( "parse_declare_component_params_comments" >:: fun ctxt ->
      assert_statement_string ~ctxt ~pretty:true "declare component Comp(p1: T1 /* c1 */);"
    );
    ( "parse_declare_component_params_comments2" >:: fun ctxt ->
      assert_statement_string
        ~ctxt
        ~pretty:true
        "declare component Comp(p1 /* c1 */: T1, /* c2 */ p2: /* c3 */ T2);"
    );
    (* TODO: This comment printing is not ideal. However, this needs to also be fixed for functions *)
    ( "parse_declare_component_params_comments3" >:: fun ctxt ->
      let ast = Ast_builder.test_statement_of_string "declare component Comp(
  p1: T1, // c1
);" in
      let layout = Js_layout_generator.statement ~opts ast in
      assert_output ~ctxt ~pretty:true "declare component Comp(
  p1: T1 // c1
  ,
);" layout
    );
  ]
