-module(toon_codec@decode@parser).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/toon_codec/decode/parser.gleam").
-export([parse_primitive/1, parse_delimited_values/2, parse_key/1, parse_array_header/1, is_array_header/1, is_key_value_line/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.

?MODULEDOC(
    " Parsing functions for TOON format elements.\n"
    "\n"
    " This module provides functions to parse array headers, keys, values,\n"
    " and delimited data from TOON format strings.\n"
    " Parse a primitive token (string, number, boolean, or null).\n"
    "\n"
    " Quoted strings remain strings even if they look like numbers.\n"
    " Parse a quoted string token.\n"
    " Parse an unquoted value (number or string).\n"
    " Parse a numeric token.\n"
    " Check if a string has a forbidden leading zero.\n"
    " Parse delimited values from a string.\n"
    "\n"
    " Splits on the delimiter while respecting quoted sections.\n"
    " Split a string on delimiter, respecting quotes.\n"
    " Parse a key from the beginning of a line.\n"
    "\n"
    " Returns the key and the position after the colon.\n"
    " Parse a quoted key.\n"
    " Parse an unquoted key.\n"
    " Parse an array header line.\n"
    "\n"
    " Returns the header info and any inline values after the colon.\n"
    " Parse the bracket segment [#?N delim?]\n"
    " Parse length and delimiter from bracket content.\n"
    " Parse fields segment {field1,field2,...}\n"
    " Unescape field names (handle quoted field names).\n"
    " Extract inline values after the colon.\n"
    " Check if a line looks like an array header.\n"
    " Check if content is a key-value line (has unquoted colon).\n"
).

-file("src/toon_codec/decode/parser.gleam", 65).
-spec parse_quoted_string(binary()) -> {ok, toon_codec@types:json_value()} |
    {error, toon_codec@error:toon_error()}.
parse_quoted_string(Token) ->
    case toon_codec@internal@string:unquote_string(Token) of
        {ok, Unescaped} ->
            {ok, {string, Unescaped}};

        {error, Err} ->
            {error, Err}
    end.

-file("src/toon_codec/decode/parser.gleam", 96).
-spec has_forbidden_leading_zero(binary()) -> boolean().
has_forbidden_leading_zero(S) ->
    case gleam@string:to_graphemes(S) of
        [<<"0"/utf8>>, Second | _] ->
            toon_codec@internal@char:is_digit(Second);

        _ ->
            false
    end.

-file("src/toon_codec/decode/parser.gleam", 83).
-spec parse_number(binary()) -> {ok, toon_codec@types:json_value()} |
    {error, toon_codec@error:toon_error()}.
parse_number(Token) ->
    case has_forbidden_leading_zero(Token) of
        true ->
            {error,
                toon_codec@error:validation_error(
                    <<"Invalid number with leading zero"/utf8>>
                )};

        false ->
            case gleam_stdlib:parse_float(Token) of
                {ok, N} ->
                    {ok, {number, N}};

                {error, _} ->
                    {error,
                        toon_codec@error:validation_error(
                            <<"Invalid number: "/utf8, Token/binary>>
                        )}
            end
    end.

-file("src/toon_codec/decode/parser.gleam", 72).
-spec parse_unquoted_value(binary()) -> {ok, toon_codec@types:json_value()} |
    {error, toon_codec@error:toon_error()}.
parse_unquoted_value(Token) ->
    case parse_number(Token) of
        {ok, Num} ->
            {ok, Num};

        {error, _} ->
            {ok, {string, Token}}
    end.

-file("src/toon_codec/decode/parser.gleam", 48).
?DOC(" Unquoted tokens are interpreted based on their content.\n").
-spec parse_primitive(binary()) -> {ok, toon_codec@types:json_value()} |
    {error, toon_codec@error:toon_error()}.
parse_primitive(Token) ->
    Trimmed = gleam@string:trim(Token),
    case Trimmed of
        <<""/utf8>> ->
            {error, toon_codec@error:validation_error(<<"Empty token"/utf8>>)};

        <<"null"/utf8>> ->
            {ok, null};

        <<"true"/utf8>> ->
            {ok, {bool, true}};

        <<"false"/utf8>> ->
            {ok, {bool, false}};

        _ ->
            case gleam_stdlib:string_starts_with(Trimmed, <<"\""/utf8>>) of
                true ->
                    parse_quoted_string(Trimmed);

                false ->
                    parse_unquoted_value(Trimmed)
            end
    end.

-file("src/toon_codec/decode/parser.gleam", 118).
-spec split_loop(
    list(binary()),
    binary(),
    list(binary()),
    list(binary()),
    boolean()
) -> list(binary()).
split_loop(Chars, Delimiter, Current_token, Acc, In_quotes) ->
    case Chars of
        [] ->
            Token = gleam@string:join(lists:reverse(Current_token), <<""/utf8>>),
            lists:reverse([Token | Acc]);

        [<<"\\"/utf8>>, Next | Rest] when In_quotes ->
            split_loop(
                Rest,
                Delimiter,
                [Next, <<"\\"/utf8>> | Current_token],
                Acc,
                In_quotes
            );

        [<<"\""/utf8>> | Rest@1] ->
            split_loop(
                Rest@1,
                Delimiter,
                [<<"\""/utf8>> | Current_token],
                Acc,
                not In_quotes
            );

        [Char | Rest@2] when (Char =:= Delimiter) andalso not In_quotes ->
            Token@1 = gleam@string:join(
                lists:reverse(Current_token),
                <<""/utf8>>
            ),
            split_loop(Rest@2, Delimiter, [], [Token@1 | Acc], In_quotes);

        [Char@1 | Rest@3] ->
            split_loop(
                Rest@3,
                Delimiter,
                [Char@1 | Current_token],
                Acc,
                In_quotes
            )
    end.

-file("src/toon_codec/decode/parser.gleam", 113).
-spec split_respecting_quotes(binary(), binary()) -> list(binary()).
split_respecting_quotes(Text, Delimiter) ->
    Chars = gleam@string:to_graphemes(Text),
    split_loop(Chars, Delimiter, [], [], false).

-file("src/toon_codec/decode/parser.gleam", 105).
-spec parse_delimited_values(binary(), toon_codec@types:delimiter()) -> list(binary()).
parse_delimited_values(Text, Delimiter) ->
    Delim_str = toon_codec@types:delimiter_to_string(Delimiter),
    split_respecting_quotes(Text, Delim_str).

-file("src/toon_codec/decode/parser.gleam", 164).
-spec parse_quoted_key(binary()) -> {ok, {binary(), integer()}} |
    {error, toon_codec@error:toon_error()}.
parse_quoted_key(Content) ->
    case toon_codec@internal@string:find_closing_quote(Content, 0) of
        {ok, Close_pos} ->
            Key_with_quotes = gleam@string:slice(Content, 0, Close_pos + 1),
            case toon_codec@internal@string:unquote_string(Key_with_quotes) of
                {ok, Key} ->
                    After_quote = gleam@string:slice(
                        Content,
                        Close_pos + 1,
                        1000
                    ),
                    case gleam@string:trim_start(After_quote) of
                        <<":"/utf8, Rest/binary>> ->
                            {ok,
                                {Key,
                                    ((Close_pos + 1) + string:length(
                                        After_quote
                                    ))
                                    - string:length(Rest)}};

                        _ ->
                            {error,
                                toon_codec@error:validation_error(
                                    <<"Missing colon after quoted key"/utf8>>
                                )}
                    end;

                {error, Err} ->
                    {error, Err}
            end;

        {error, Err@1} ->
            {error, Err@1}
    end.

-file("src/toon_codec/decode/parser.gleam", 189).
-spec parse_unquoted_key(binary()) -> {ok, {binary(), integer()}} |
    {error, toon_codec@error:toon_error()}.
parse_unquoted_key(Content) ->
    case toon_codec@internal@string:find_unquoted_char(Content, <<":"/utf8>>, 0) of
        {some, Colon_pos} ->
            Key = begin
                _pipe = gleam@string:slice(Content, 0, Colon_pos),
                gleam@string:trim(_pipe)
            end,
            {ok, {Key, Colon_pos + 1}};

        none ->
            {error,
                toon_codec@error:validation_error(
                    <<"Missing colon after key"/utf8>>
                )}
    end.

-file("src/toon_codec/decode/parser.gleam", 157).
-spec parse_key(binary()) -> {ok, {binary(), integer()}} |
    {error, toon_codec@error:toon_error()}.
parse_key(Content) ->
    case gleam_stdlib:string_starts_with(Content, <<"\""/utf8>>) of
        true ->
            parse_quoted_key(Content);

        false ->
            parse_unquoted_key(Content)
    end.

-file("src/toon_codec/decode/parser.gleam", 265).
-spec parse_length_and_delimiter(binary(), boolean(), binary()) -> {ok,
        {integer(), toon_codec@types:delimiter(), boolean(), binary()}} |
    {error, toon_codec@error:toon_error()}.
parse_length_and_delimiter(Content, Has_marker, Rest) ->
    case gleam_stdlib:string_ends_with(Content, <<"\t"/utf8>>) of
        true ->
            Len_str = begin
                _pipe = gleam@string:slice(
                    Content,
                    0,
                    string:length(Content) - 1
                ),
                gleam@string:trim(_pipe)
            end,
            case gleam_stdlib:parse_int(Len_str) of
                {ok, Length} ->
                    {ok, {Length, tab, Has_marker, Rest}};

                {error, _} ->
                    {error,
                        toon_codec@error:validation_error(
                            <<"Invalid array length: "/utf8, Len_str/binary>>
                        )}
            end;

        false ->
            case gleam_stdlib:string_ends_with(Content, <<"|"/utf8>>) of
                true ->
                    Len_str@1 = begin
                        _pipe@1 = gleam@string:slice(
                            Content,
                            0,
                            string:length(Content) - 1
                        ),
                        gleam@string:trim(_pipe@1)
                    end,
                    case gleam_stdlib:parse_int(Len_str@1) of
                        {ok, Length@1} ->
                            {ok, {Length@1, pipe, Has_marker, Rest}};

                        {error, _} ->
                            {error,
                                toon_codec@error:validation_error(
                                    <<"Invalid array length: "/utf8,
                                        Len_str@1/binary>>
                                )}
                    end;

                false ->
                    Len_str@2 = gleam@string:trim(Content),
                    case gleam_stdlib:parse_int(Len_str@2) of
                        {ok, Length@2} ->
                            {ok, {Length@2, comma, Has_marker, Rest}};

                        {error, _} ->
                            {error,
                                toon_codec@error:validation_error(
                                    <<"Invalid array length: "/utf8,
                                        Len_str@2/binary>>
                                )}
                    end
            end
    end.

-file("src/toon_codec/decode/parser.gleam", 243).
-spec parse_bracket_segment(binary()) -> {ok,
        {integer(), toon_codec@types:delimiter(), boolean(), binary()}} |
    {error, toon_codec@error:toon_error()}.
parse_bracket_segment(After_bracket) ->
    case gleam@string:split_once(After_bracket, <<"]"/utf8>>) of
        {ok, {Bracket_content, Rest}} ->
            {Has_marker, Content_after_marker} = case gleam_stdlib:string_starts_with(
                Bracket_content,
                <<"#"/utf8>>
            ) of
                true ->
                    {true, gleam@string:drop_start(Bracket_content, 1)};

                false ->
                    {false, Bracket_content}
            end,
            parse_length_and_delimiter(Content_after_marker, Has_marker, Rest);

        {error, _} ->
            {error,
                toon_codec@error:validation_error(
                    <<"Invalid array header: no closing bracket"/utf8>>
                )}
    end.

-file("src/toon_codec/decode/parser.gleam", 338).
-spec unescape_names_loop(list(binary()), list(binary())) -> {ok,
        list(binary())} |
    {error, toon_codec@error:toon_error()}.
unescape_names_loop(Names, Acc) ->
    case Names of
        [] ->
            {ok, lists:reverse(Acc)};

        [Name | Rest] ->
            Trimmed = gleam@string:trim(Name),
            case gleam_stdlib:string_starts_with(Trimmed, <<"\""/utf8>>) of
                true ->
                    case toon_codec@internal@string:unquote_string(Trimmed) of
                        {ok, Unescaped} ->
                            unescape_names_loop(Rest, [Unescaped | Acc]);

                        {error, Err} ->
                            {error, Err}
                    end;

                false ->
                    unescape_names_loop(Rest, [Trimmed | Acc])
            end
    end.

-file("src/toon_codec/decode/parser.gleam", 334).
-spec unescape_field_names(list(binary())) -> {ok, list(binary())} |
    {error, toon_codec@error:toon_error()}.
unescape_field_names(Names) ->
    unescape_names_loop(Names, []).

-file("src/toon_codec/decode/parser.gleam", 306).
-spec parse_fields_segment(binary(), toon_codec@types:delimiter()) -> {ok,
        {gleam@option:option(list(binary())), binary()}} |
    {error, toon_codec@error:toon_error()}.
parse_fields_segment(After_bracket, Delimiter) ->
    Trimmed = gleam@string:trim_start(After_bracket),
    case gleam_stdlib:string_starts_with(Trimmed, <<"{"/utf8>>) of
        true ->
            case gleam@string:split_once(Trimmed, <<"}"/utf8>>) of
                {ok, {Fields_content, Rest}} ->
                    Fields_str = gleam@string:drop_start(Fields_content, 1),
                    Field_names = parse_delimited_values(Fields_str, Delimiter),
                    case unescape_field_names(Field_names) of
                        {ok, Unescaped_fields} ->
                            {ok, {{some, Unescaped_fields}, Rest}};

                        {error, Err} ->
                            {error, Err}
                    end;

                {error, _} ->
                    {error,
                        toon_codec@error:validation_error(
                            <<"Unclosed fields segment: missing }"/utf8>>
                        )}
            end;

        false ->
            {ok, {none, Trimmed}}
    end.

-file("src/toon_codec/decode/parser.gleam", 359).
-spec extract_inline_values(binary()) -> gleam@option:option(binary()).
extract_inline_values(After_fields) ->
    Trimmed = gleam@string:trim_start(After_fields),
    case gleam_stdlib:string_starts_with(Trimmed, <<":"/utf8>>) of
        true ->
            After_colon = begin
                _pipe = gleam@string:drop_start(Trimmed, 1),
                gleam@string:trim_start(_pipe)
            end,
            case After_colon of
                <<""/utf8>> ->
                    none;

                Values ->
                    {some, Values}
            end;

        false ->
            none
    end.

-file("src/toon_codec/decode/parser.gleam", 201).
-spec parse_array_header(binary()) -> {ok,
        {toon_codec@types:array_header(), gleam@option:option(binary())}} |
    {error, toon_codec@error:toon_error()}.
parse_array_header(Line) ->
    case gleam@string:split_once(Line, <<"["/utf8>>) of
        {ok, {Before_bracket, After_bracket}} ->
            Key = case gleam@string:trim(Before_bracket) of
                <<""/utf8>> ->
                    none;

                K ->
                    {some, K}
            end,
            case parse_bracket_segment(After_bracket) of
                {ok, {Length, Delimiter, Has_marker, Rest_after_bracket}} ->
                    case parse_fields_segment(Rest_after_bracket, Delimiter) of
                        {ok, {Fields, Rest_after_fields}} ->
                            Inline_values = extract_inline_values(
                                Rest_after_fields
                            ),
                            Header = {array_header,
                                Key,
                                Length,
                                Delimiter,
                                Fields,
                                Has_marker},
                            {ok, {Header, Inline_values}};

                        {error, Err} ->
                            {error, Err}
                    end;

                {error, Err@1} ->
                    {error, Err@1}
            end;

        {error, _} ->
            {error,
                toon_codec@error:validation_error(
                    <<"Invalid array header: no opening bracket"/utf8>>
                )}
    end.

-file("src/toon_codec/decode/parser.gleam", 376).
-spec is_array_header(binary()) -> boolean().
is_array_header(Content) ->
    gleam_stdlib:contains_string(Content, <<"["/utf8>>) andalso gleam_stdlib:contains_string(
        Content,
        <<"]"/utf8>>
    ).

-file("src/toon_codec/decode/parser.gleam", 380).
-spec is_key_value_line(binary()) -> boolean().
is_key_value_line(Content) ->
    case toon_codec@internal@string:find_unquoted_char(Content, <<":"/utf8>>, 0) of
        {some, _} ->
            true;

        none ->
            false
    end.