-module(glemini@gemtext).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([line_to_string/1, lines_to_string/1, text/1, link/1, link_with_caption/2, heading1/1, heading2/1, heading3/1, list_item/1, qoute/1, preformatted/1, preformatted_with_caption/2, blank_line/0]).
-export_type([line/0]).

-opaque line() :: {text, binary()} |
    {link, binary(), gleam@option:option(binary())} |
    {heading1, binary()} |
    {heading2, binary()} |
    {heading3, binary()} |
    {list_item, binary()} |
    {qoute, binary()} |
    {preformatted, binary(), gleam@option:option(binary())}.

-spec line_to_string(line()) -> binary().
line_to_string(Line) ->
    case Line of
        {text, Text} ->
            Text;

        {link, Uri, {some, Caption}} ->
            <<<<<<"=> "/utf8, Uri/binary>>/binary, " "/utf8>>/binary,
                Caption/binary>>;

        {link, Uri@1, none} ->
            <<"=> "/utf8, Uri@1/binary>>;

        {heading1, Text@1} ->
            <<"# "/utf8, Text@1/binary>>;

        {heading2, Text@2} ->
            <<"## "/utf8, Text@2/binary>>;

        {heading3, Text@3} ->
            <<"### "/utf8, Text@3/binary>>;

        {list_item, Text@4} ->
            <<"* "/utf8, Text@4/binary>>;

        {qoute, Text@5} ->
            <<"> "/utf8, Text@5/binary>>;

        {preformatted, Text@6, {some, Caption@1}} ->
            <<<<<<<<"```"/utf8, Caption@1/binary>>/binary, "\n"/utf8>>/binary,
                    Text@6/binary>>/binary,
                "\n```"/utf8>>;

        {preformatted, Text@7, none} ->
            <<<<"```\n"/utf8, Text@7/binary>>/binary, "\n```"/utf8>>
    end.

-spec lines_to_string(list(line())) -> binary().
lines_to_string(Lines) ->
    _pipe = gleam@list:map(Lines, fun line_to_string/1),
    gleam@string:join(_pipe, <<"\n"/utf8>>).

-spec text(binary()) -> line().
text(Text) ->
    {text, Text}.

-spec link(binary()) -> line().
link(Uri) ->
    {link, Uri, none}.

-spec link_with_caption(binary(), binary()) -> line().
link_with_caption(Uri, Text) ->
    {link, Uri, {some, Text}}.

-spec heading1(binary()) -> line().
heading1(Text) ->
    {heading1, Text}.

-spec heading2(binary()) -> line().
heading2(Text) ->
    {heading2, Text}.

-spec heading3(binary()) -> line().
heading3(Text) ->
    {heading3, Text}.

-spec list_item(binary()) -> line().
list_item(Text) ->
    {list_item, Text}.

-spec qoute(binary()) -> line().
qoute(Text) ->
    {qoute, Text}.

-spec preformatted(binary()) -> line().
preformatted(Text) ->
    {preformatted, Text, none}.

-spec preformatted_with_caption(binary(), binary()) -> line().
preformatted_with_caption(Text, Caption) ->
    {preformatted, Text, {some, Caption}}.

-spec blank_line() -> line().
blank_line() ->
    {text, <<""/utf8>>}.