-module(oaspec@codegen@server).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/oaspec/codegen/server.gleam").
-export([generate/1]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

-file("src/oaspec/codegen/server.gleam", 41).
?DOC(" Generate a single handler stub.\n").
-spec generate_handler(
    gleam@string_tree:string_tree(),
    binary(),
    oaspec@openapi@spec:operation(),
    oaspec@codegen@context:context()
) -> gleam@string_tree:string_tree().
generate_handler(Sb, Op_id, Operation, _) ->
    Fn_name = oaspec@util@naming:operation_to_function_name(Op_id),
    Request_type = <<(oaspec@util@naming:schema_to_type_name(Op_id))/binary,
        "Request"/utf8>>,
    Response_type = <<(oaspec@util@naming:schema_to_type_name(Op_id))/binary,
        "Response"/utf8>>,
    Sb@1 = case erlang:element(3, Operation) of
        {some, Summary} ->
            _pipe = Sb,
            oaspec@util@string_extra:doc_comment(_pipe, Summary);

        _ ->
            Sb
    end,
    Sb@2 = case erlang:element(4, Operation) of
        {some, Desc} ->
            _pipe@1 = Sb@1,
            oaspec@util@string_extra:doc_comment(_pipe@1, Desc);

        _ ->
            Sb@1
    end,
    Has_params = not gleam@list:is_empty(erlang:element(6, Operation)) orelse gleam@option:is_some(
        erlang:element(7, Operation)
    ),
    Sb@3 = case Has_params of
        true ->
            _pipe@2 = Sb@2,
            oaspec@util@string_extra:line(
                _pipe@2,
                <<<<<<<<<<<<"pub fn "/utf8, Fn_name/binary>>/binary,
                                    "(req: request_types."/utf8>>/binary,
                                Request_type/binary>>/binary,
                            ") -> response_types."/utf8>>/binary,
                        Response_type/binary>>/binary,
                    " {"/utf8>>
            );

        false ->
            _pipe@3 = Sb@2,
            oaspec@util@string_extra:line(
                _pipe@3,
                <<<<<<<<"pub fn "/utf8, Fn_name/binary>>/binary,
                            "() -> response_types."/utf8>>/binary,
                        Response_type/binary>>/binary,
                    " {"/utf8>>
            )
    end,
    Sb@4 = case Has_params of
        true ->
            _pipe@4 = Sb@3,
            oaspec@util@string_extra:indent(_pipe@4, 1, <<"let _ = req"/utf8>>);

        false ->
            Sb@3
    end,
    _pipe@5 = Sb@4,
    _pipe@6 = oaspec@util@string_extra:indent(
        _pipe@5,
        1,
        <<"// TODO: Implement "/utf8, Fn_name/binary>>
    ),
    _pipe@7 = oaspec@util@string_extra:indent(_pipe@6, 1, <<"todo"/utf8>>),
    _pipe@8 = oaspec@util@string_extra:line(_pipe@7, <<"}"/utf8>>),
    oaspec@util@string_extra:blank_line(_pipe@8).

-file("src/oaspec/codegen/server.gleam", 21).
?DOC(" Generate handler stubs for all operations.\n").
-spec generate_handlers(oaspec@codegen@context:context()) -> binary().
generate_handlers(Ctx) ->
    Sb = begin
        _pipe = oaspec@util@string_extra:file_header(<<"0.1.2"/utf8>>),
        oaspec@util@string_extra:imports(
            _pipe,
            [<<(erlang:element(5, erlang:element(3, Ctx)))/binary,
                    "/request_types"/utf8>>,
                <<(erlang:element(5, erlang:element(3, Ctx)))/binary,
                    "/response_types"/utf8>>]
        )
    end,
    Operations = oaspec@codegen@types:collect_operations(Ctx),
    Sb@2 = gleam@list:fold(
        Operations,
        Sb,
        fun(Sb@1, Op) ->
            {Op_id, Operation, _, _} = Op,
            generate_handler(Sb@1, Op_id, Operation, Ctx)
        end
    ),
    oaspec@util@string_extra:to_string(Sb@2).

-file("src/oaspec/codegen/server.gleam", 157).
?DOC(" Check if a path segment is a parameter.\n").
-spec is_path_param(binary()) -> boolean().
is_path_param(Segment) ->
    case Segment of
        <<"{"/utf8, _/binary>> ->
            true;

        _ ->
            false
    end.

-file("src/oaspec/codegen/server.gleam", 172).
?DOC(" Simple string split (avoiding import issues).\n").
-spec string_split(binary(), binary()) -> list(binary()).
string_split(Input, Delimiter) ->
    string:split(Input, Delimiter).

-file("src/oaspec/codegen/server.gleam", 184).
?DOC(" Simple string replace.\n").
-spec string_replace(binary(), binary(), binary()) -> binary().
string_replace(Input, Pattern, Replacement) ->
    gleam_stdlib:string_replace(Input, Pattern, Replacement).

-file("src/oaspec/codegen/server.gleam", 165).
?DOC(" Extract parameter name from {name}.\n").
-spec extract_param_name(binary()) -> binary().
extract_param_name(Segment) ->
    _pipe = Segment,
    _pipe@1 = string_replace(_pipe, <<"{"/utf8>>, <<""/utf8>>),
    string_replace(_pipe@1, <<"}"/utf8>>, <<""/utf8>>).

-file("src/oaspec/codegen/server.gleam", 136).
?DOC(" Convert an OpenAPI path to a Gleam pattern match expression.\n").
-spec path_to_pattern(binary()) -> binary().
path_to_pattern(Path) ->
    Segments = begin
        _pipe = Path,
        _pipe@1 = string_split(_pipe, <<"/"/utf8>>),
        gleam@list:filter(_pipe@1, fun(S) -> S /= <<""/utf8>> end)
    end,
    Patterns = gleam@list:map(Segments, fun(Seg) -> case is_path_param(Seg) of
                true ->
                    Param_name = extract_param_name(Seg),
                    oaspec@util@naming:to_snake_case(Param_name);

                false ->
                    <<<<"\""/utf8, Seg/binary>>/binary, "\""/utf8>>
            end end),
    <<<<"["/utf8,
            (oaspec@util@string_extra:join_with(Patterns, <<", "/utf8>>))/binary>>/binary,
        "]"/utf8>>.

-file("src/oaspec/codegen/server.gleam", 96).
?DOC(" Generate a router module that dispatches requests.\n").
-spec generate_router(oaspec@codegen@context:context()) -> binary().
generate_router(Ctx) ->
    Sb = begin
        _pipe = oaspec@util@string_extra:file_header(<<"0.1.2"/utf8>>),
        oaspec@util@string_extra:imports(
            _pipe,
            [<<(erlang:element(5, erlang:element(3, Ctx)))/binary,
                    "/handlers"/utf8>>]
        )
    end,
    Sb@1 = begin
        _pipe@1 = Sb,
        _pipe@2 = oaspec@util@string_extra:doc_comment(
            _pipe@1,
            <<"Route an incoming request to the appropriate handler."/utf8>>
        ),
        _pipe@3 = oaspec@util@string_extra:line(
            _pipe@2,
            <<"pub fn route(method: String, path: List(String)) -> String {"/utf8>>
        ),
        oaspec@util@string_extra:indent(
            _pipe@3,
            1,
            <<"case method, path {"/utf8>>
        )
    end,
    Operations = oaspec@codegen@types:collect_operations(Ctx),
    Sb@3 = gleam@list:fold(
        Operations,
        Sb@1,
        fun(Sb@2, Op) ->
            {Op_id, _, Path, Method} = Op,
            Fn_name = oaspec@util@naming:operation_to_function_name(Op_id),
            Method_str = oaspec@openapi@spec:method_to_string(Method),
            Path_pattern = path_to_pattern(Path),
            _pipe@4 = Sb@2,
            _pipe@5 = oaspec@util@string_extra:indent(
                _pipe@4,
                2,
                <<<<<<<<"\""/utf8, Method_str/binary>>/binary, "\", "/utf8>>/binary,
                        Path_pattern/binary>>/binary,
                    " -> {"/utf8>>
            ),
            _pipe@6 = oaspec@util@string_extra:indent(
                _pipe@5,
                3,
                <<"let _ = handlers."/utf8, Fn_name/binary>>
            ),
            _pipe@7 = oaspec@util@string_extra:indent(
                _pipe@6,
                3,
                <<"\"OK\""/utf8>>
            ),
            oaspec@util@string_extra:indent(_pipe@7, 2, <<"}"/utf8>>)
        end
    ),
    Sb@4 = begin
        _pipe@8 = Sb@3,
        _pipe@9 = oaspec@util@string_extra:indent(
            _pipe@8,
            2,
            <<"_, _ -> \"Not Found\""/utf8>>
        ),
        _pipe@10 = oaspec@util@string_extra:indent(_pipe@9, 1, <<"}"/utf8>>),
        _pipe@11 = oaspec@util@string_extra:line(_pipe@10, <<"}"/utf8>>),
        oaspec@util@string_extra:blank_line(_pipe@11)
    end,
    oaspec@util@string_extra:to_string(Sb@4).

-file("src/oaspec/codegen/server.gleam", 10).
?DOC(" Generate server stub files.\n").
-spec generate(oaspec@codegen@context:context()) -> list(oaspec@codegen@context:generated_file()).
generate(Ctx) ->
    Handlers_content = generate_handlers(Ctx),
    Router_content = generate_router(Ctx),
    [{generated_file, <<"handlers.gleam"/utf8>>, Handlers_content},
        {generated_file, <<"router.gleam"/utf8>>, Router_content}].