-module(glance_armstrong).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/glance_armstrong.gleam").
-export([format_diagnostic_without_span/1, format_reference_line/3, format_diagnostic_without_span_with_tips/2, format_source_diagnostic/3, format_source_diagnostic_with_tips/4, format_glance_parse_error/2]).

-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(
    " Two-line terminal diagnostics: `line | source` then padded `^` + message.\n"
    " Used by [`schema_definition.format_parse_error`](schema_definition.html#format_parse_error).\n"
).

-file("src/glance_armstrong.gleam", 130).
-spec gutter_display_width(binary()) -> integer().
gutter_display_width(Gutter) ->
    string:length(Gutter).

-file("src/glance_armstrong.gleam", 44).
?DOC(" Same visual style when no byte span exists (unknown or out-of-range).\n").
-spec format_diagnostic_without_span(binary()) -> binary().
format_diagnostic_without_span(Message) ->
    Gutter = <<"   — | "/utf8>>,
    Code_line = <<Gutter/binary, "<no source location>"/utf8>>,
    Pad = gutter_display_width(Gutter),
    Pointer = <<<<(gleam@string:repeat(<<" "/utf8>>, Pad))/binary, "^ "/utf8>>/binary,
        Message/binary>>,
    <<<<Code_line/binary, "\n"/utf8>>/binary, Pointer/binary>>.

-file("src/glance_armstrong.gleam", 113).
-spec render_gutter_block(integer(), binary(), integer(), integer(), binary()) -> binary().
render_gutter_block(Line_no, Line_text, Caret_col, Caret_width, Message) ->
    Num = gleam@string:pad_start(
        erlang:integer_to_binary(Line_no),
        4,
        <<" "/utf8>>
    ),
    Gutter = <<Num/binary, " | "/utf8>>,
    Code_line = <<Gutter/binary, Line_text/binary>>,
    Pad_width = gutter_display_width(Gutter) + Caret_col,
    Spaces = gleam@string:repeat(<<" "/utf8>>, Pad_width),
    Carets = gleam@string:repeat(<<"^"/utf8>>, gleam@int:max(1, Caret_width)),
    Pointer = <<<<<<Spaces/binary, Carets/binary>>/binary, " "/utf8>>/binary,
        Message/binary>>,
    <<<<Code_line/binary, "\n"/utf8>>/binary, Pointer/binary>>.

-file("src/glance_armstrong.gleam", 104).
?DOC(" Same gutter as [`format_source_diagnostic`](#format_source_diagnostic), for an arbitrary line (e.g. extra notes).\n").
-spec format_reference_line(integer(), binary(), binary()) -> binary().
format_reference_line(Line_no, Line_text, Message) ->
    W = gleam@int:min(40, gleam@int:max(1, erlang:byte_size(Line_text))),
    render_gutter_block(Line_no, Line_text, 0, W, Message).

-file("src/glance_armstrong.gleam", 146).
-spec format_one_tip_block(binary()) -> binary().
format_one_tip_block(Tip) ->
    case gleam@string:split(Tip, <<"\n"/utf8>>) of
        [] ->
            <<"  • "/utf8>>;

        [First | Rest] ->
            Head = <<"  • "/utf8, First/binary>>,
            gleam@list:fold(Rest, Head, fun(Acc, Line) -> case Line of
                        <<""/utf8>> ->
                            <<Acc/binary, "\n"/utf8>>;

                        _ ->
                            <<<<Acc/binary, "\n    "/utf8>>/binary,
                                Line/binary>>
                    end end)
    end.

-file("src/glance_armstrong.gleam", 141).
-spec format_tip_blocks(list(binary())) -> binary().
format_tip_blocks(Tips) ->
    _pipe = gleam@list:map(Tips, fun format_one_tip_block/1),
    gleam@string:join(_pipe, <<"\n"/utf8>>).

-file("src/glance_armstrong.gleam", 134).
-spec format_tips_suffix(list(binary())) -> binary().
format_tips_suffix(Tips) ->
    case Tips of
        [] ->
            <<""/utf8>>;

        Lines ->
            <<"\n\n"/utf8, (format_tip_blocks(Lines))/binary>>
    end.

-file("src/glance_armstrong.gleam", 63).
?DOC(" Like [`format_diagnostic_without_span`](#format_diagnostic_without_span), then bullet tips.\n").
-spec format_diagnostic_without_span_with_tips(binary(), list(binary())) -> binary().
format_diagnostic_without_span_with_tips(Message, Tips) ->
    <<(format_diagnostic_without_span(Message))/binary,
        (format_tips_suffix(Tips))/binary>>.

-file("src/glance_armstrong.gleam", 161).
-spec generic_param_highlight_bytes(binary()) -> gleam@option:option({integer(),
    integer()}).
generic_param_highlight_bytes(Line_text) ->
    case gleam@string:split(Line_text, <<"("/utf8>>) of
        [Before, After_open | _] ->
            Open_col = erlang:byte_size(Before),
            case gleam@string:split(After_open, <<")"/utf8>>) of
                [Inside | _] ->
                    W = (1 + erlang:byte_size(Inside)) + 1,
                    {some, {Open_col, gleam@int:max(1, W)}};

                _ ->
                    none
            end;

        _ ->
            none
    end.

-file("src/glance_armstrong.gleam", 177).
-spec source_lines_with_byte_starts(binary()) -> list({integer(), binary()}).
source_lines_with_byte_starts(Source) ->
    Parts = gleam@string:split(Source, <<"\n"/utf8>>),
    {Rows_rev, _} = gleam@list:fold(
        Parts,
        {[], 0},
        fun(State, Line_text) ->
            {Acc_rows, Byte_offset} = State,
            {[{Byte_offset, Line_text} | Acc_rows],
                (Byte_offset + erlang:byte_size(Line_text)) + 1}
        end
    ),
    lists:reverse(Rows_rev).

-file("src/glance_armstrong.gleam", 190).
-spec source_indexed_lines(binary()) -> list({integer(), integer(), binary()}).
source_indexed_lines(Source) ->
    Raw = source_lines_with_byte_starts(Source),
    gleam@list:index_map(
        Raw,
        fun(Pair, I) ->
            {Byte_start, Text} = Pair,
            {I + 1, Byte_start, Text}
        end
    ).

-file("src/glance_armstrong.gleam", 82).
-spec format_unexpected_eof_diagnostic(binary()) -> binary().
format_unexpected_eof_diagnostic(Source) ->
    Indexed = source_indexed_lines(Source),
    case gleam@list:last(Indexed) of
        {error, nil} ->
            format_diagnostic_without_span(
                <<"unexpected end of input when parsing Gleam (empty file)"/utf8>>
            );

        {ok, {Line_no, _, Line_text}} ->
            Line_blen = erlang:byte_size(Line_text),
            Caret_col = gleam@int:max(0, Line_blen - 1),
            render_gutter_block(
                Line_no,
                Line_text,
                Caret_col,
                1,
                <<"unexpected end of input when parsing Gleam"/utf8>>
            )
    end.

-file("src/glance_armstrong.gleam", 198).
-spec find_line_for_byte(list({integer(), integer(), binary()}), integer()) -> {ok,
        {integer(), integer(), binary()}} |
    {error, nil}.
find_line_for_byte(Indexed, Byte_pos) ->
    On_line = fun(Row) ->
        {_, Start, Text} = Row,
        After_start = Byte_pos >= Start,
        Line_past = Start + erlang:byte_size(Text),
        Before_end = Byte_pos =< Line_past,
        After_start andalso Before_end
    end,
    case gleam@list:filter(Indexed, On_line) of
        [Row@1 | _] ->
            {ok, Row@1};

        [] ->
            case gleam@list:last(Indexed) of
                {ok, Row@2} ->
                    {ok, Row@2};

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

-file("src/glance_armstrong.gleam", 11).
?DOC(" `line | full line text` then a second line with spaces, carets, and `message`.\n").
-spec format_source_diagnostic(binary(), glance:span(), binary()) -> binary().
format_source_diagnostic(Source, Span, Message) ->
    {span, Raw_start, Raw_end} = Span,
    Start_byte = gleam@int:max(0, Raw_start),
    End_byte = gleam@int:max(Start_byte, Raw_end),
    Indexed = source_indexed_lines(Source),
    case find_line_for_byte(Indexed, Start_byte) of
        {error, nil} ->
            format_diagnostic_without_span(Message);

        {ok, {Line_no, Line_start, Line_text}} ->
            Col = Start_byte - Line_start,
            Line_blen = erlang:byte_size(Line_text),
            Col_clamped = gleam@int:min(Col, Line_blen),
            Max_w = gleam@int:max(1, Line_blen - Col_clamped),
            Raw_w = End_byte - Start_byte,
            {Caret_col, Caret_width} = case generic_param_highlight_bytes(
                Line_text
            ) of
                {some, {C, W}} ->
                    case gleam_stdlib:contains_string(
                        Message,
                        <<"generic parameters"/utf8>>
                    ) of
                        true ->
                            {C, W};

                        false ->
                            {Col_clamped,
                                gleam@int:max(1, gleam@int:min(Raw_w, Max_w))}
                    end;

                none ->
                    {Col_clamped, gleam@int:max(1, gleam@int:min(Raw_w, Max_w))}
            end,
            render_gutter_block(
                Line_no,
                Line_text,
                Caret_col,
                Caret_width,
                Message
            )
    end.

-file("src/glance_armstrong.gleam", 53).
?DOC(" Like [`format_source_diagnostic`](#format_source_diagnostic), then bullet tips (for longer help text).\n").
-spec format_source_diagnostic_with_tips(
    binary(),
    glance:span(),
    binary(),
    list(binary())
) -> binary().
format_source_diagnostic_with_tips(Source, Span, Message, Tips) ->
    <<(format_source_diagnostic(Source, Span, Message))/binary,
        (format_tips_suffix(Tips))/binary>>.

-file("src/glance_armstrong.gleam", 70).
-spec format_glance_parse_error(binary(), glance:error()) -> binary().
format_glance_parse_error(Source, Error) ->
    case Error of
        unexpected_end_of_input ->
            format_unexpected_eof_diagnostic(Source);

        {unexpected_token, _, Pos} ->
            format_source_diagnostic(
                Source,
                {span, erlang:element(2, Pos), erlang:element(2, Pos) + 1},
                <<"unexpected token"/utf8>>
            )
    end.