-module(automata@ical@parser).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/automata/ical/parser.gleam").
-export([parse/1]).
-export_type([parse_error/0]).

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

-type parse_error() :: {unexpected_end, integer()} |
    {mismatched_block, binary(), binary(), integer()} |
    {malformed_property, integer(), binary()} |
    {malformed_parameter, integer(), binary()} |
    empty_input_error.

-file("src/automata/ical/parser.gleam", 26).
-spec lex_error_to_parse_error(automata@ical@lexer:lex_error()) -> parse_error().
lex_error_to_parse_error(Err) ->
    case Err of
        empty_input ->
            empty_input_error;

        {malformed_line, Ln, Raw} ->
            {malformed_property, Ln, Raw};

        {malformed_parameter, Ln@1, Raw@1} ->
            {malformed_parameter, Ln@1, Raw@1}
    end.

-file("src/automata/ical/parser.gleam", 36).
-spec tokenize_all(
    list(automata@ical@lexer:logical_line()),
    list(automata@ical@ast:raw_property())
) -> {ok, list(automata@ical@ast:raw_property())} | {error, parse_error()}.
tokenize_all(Lines, Acc) ->
    case Lines of
        [] ->
            {ok, lists:reverse(Acc)};

        [First | Rest] ->
            case automata@ical@lexer:tokenize_line(First) of
                {error, Err} ->
                    {error, lex_error_to_parse_error(Err)};

                {ok, Prop} ->
                    tokenize_all(Rest, [Prop | Acc])
            end
    end.

-file("src/automata/ical/parser.gleam", 79).
?DOC(" BEGIN:kind の中を読み進めて、END:kind を見つけたらそこで切り上げる。\n").
-spec consume_component(
    binary(),
    integer(),
    list(automata@ical@ast:raw_property()),
    list(automata@ical@ast:raw_property()),
    list(automata@ical@ast:raw_component())
) -> {ok,
        {automata@ical@ast:raw_component(),
            list(automata@ical@ast:raw_property())}} |
    {error, parse_error()}.
consume_component(Kind, Begin_line, Properties, Acc_props, Acc_children) ->
    case Properties of
        [] ->
            {error, {mismatched_block, Kind, <<"<eof>"/utf8>>, Begin_line}};

        [First | Rest] ->
            {raw_property, Name, _, Raw_value, Ln} = First,
            case Name of
                <<"END"/utf8>> ->
                    End_kind = string:uppercase(Raw_value),
                    case End_kind =:= Kind of
                        true ->
                            Component = {raw_component,
                                Kind,
                                lists:reverse(Acc_props),
                                lists:reverse(Acc_children),
                                Begin_line},
                            {ok, {Component, Rest}};

                        false ->
                            {error, {mismatched_block, Kind, End_kind, Ln}}
                    end;

                <<"BEGIN"/utf8>> ->
                    Child_kind = string:uppercase(Raw_value),
                    gleam@result:'try'(
                        consume_component(Child_kind, Ln, Rest, [], []),
                        fun(_use0) ->
                            {Child, After} = _use0,
                            consume_component(
                                Kind,
                                Begin_line,
                                After,
                                Acc_props,
                                [Child | Acc_children]
                            )
                        end
                    );

                _ ->
                    consume_component(
                        Kind,
                        Begin_line,
                        Rest,
                        [First | Acc_props],
                        Acc_children
                    )
            end
    end.

-file("src/automata/ical/parser.gleam", 50).
-spec build_calendar(list(automata@ical@ast:raw_property())) -> {ok,
        automata@ical@ast:raw_calendar()} |
    {error, parse_error()}.
build_calendar(Properties) ->
    case Properties of
        [] ->
            {error, empty_input_error};

        [{raw_property, Name, _, Raw_value, Ln} | Rest] ->
            Normalized_name = Name,
            Normalized_value = string:uppercase(Raw_value),
            case {Normalized_name, Normalized_value} of
                {<<"BEGIN"/utf8>>, <<"VCALENDAR"/utf8>>} ->
                    gleam@result:'try'(
                        consume_component(
                            <<"VCALENDAR"/utf8>>,
                            Ln,
                            Rest,
                            [],
                            []
                        ),
                        fun(_use0) ->
                            {Vcal, Leftover} = _use0,
                            case Leftover of
                                [] ->
                                    {raw_component, _, Props, Children, _} = Vcal,
                                    {ok, {raw_calendar, Props, Children}};

                                [{raw_property, _, _, _, Leftover_ln} | _] ->
                                    {error, {unexpected_end, Leftover_ln}}
                            end
                        end
                    );

                {_, _} ->
                    {error, {unexpected_end, Ln}}
            end
    end.

-file("src/automata/ical/parser.gleam", 18).
-spec parse(binary()) -> {ok, automata@ical@ast:raw_calendar()} |
    {error, parse_error()}.
parse(Input) ->
    gleam@result:'try'(
        begin
            _pipe = automata@ical@lexer:unfold(Input),
            gleam@result:map_error(_pipe, fun lex_error_to_parse_error/1)
        end,
        fun(Logical_lines) ->
            gleam@result:'try'(
                tokenize_all(Logical_lines, []),
                fun(Properties) -> build_calendar(Properties) end
            )
        end
    ).