-module(plunk@transactional).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([send_transactional_email_decoder/0, send/2, decode/1]).
-export_type([to/0, transactional_email/0, contact/0, email/0, send_transactional_email_response/0]).

-type to() :: {address, binary()} | {addresses, list(binary())}.

-type transactional_email() :: {transactional_email,
        to(),
        binary(),
        binary(),
        gleam@option:option(binary()),
        gleam@option:option(binary())}.

-type contact() :: {contact, binary(), binary()}.

-type email() :: {email, contact(), binary()}.

-type send_transactional_email_response() :: {send_transactional_email_response,
        boolean(),
        list(email()),
        gleam@option:option(binary())}.

-spec contact_decoder() -> fun((gleam@dynamic:dynamic_()) -> {ok, contact()} |
    {error, list(gleam@dynamic:decode_error())}).
contact_decoder() ->
    gleam@dynamic:decode2(
        fun(Field@0, Field@1) -> {contact, Field@0, Field@1} end,
        gleam@dynamic:field(<<"id"/utf8>>, fun gleam@dynamic:string/1),
        gleam@dynamic:field(<<"email"/utf8>>, fun gleam@dynamic:string/1)
    ).

-spec email_decoder() -> fun((gleam@dynamic:dynamic_()) -> {ok, email()} |
    {error, list(gleam@dynamic:decode_error())}).
email_decoder() ->
    gleam@dynamic:decode2(
        fun(Field@0, Field@1) -> {email, Field@0, Field@1} end,
        gleam@dynamic:field(<<"contact"/utf8>>, contact_decoder()),
        gleam@dynamic:field(<<"email"/utf8>>, fun gleam@dynamic:string/1)
    ).

-spec send_transactional_email_decoder() -> fun((gleam@dynamic:dynamic_()) -> {ok,
        send_transactional_email_response()} |
    {error, list(gleam@dynamic:decode_error())}).
send_transactional_email_decoder() ->
    gleam@dynamic:decode3(
        fun(Field@0, Field@1, Field@2) -> {send_transactional_email_response, Field@0, Field@1, Field@2} end,
        gleam@dynamic:field(<<"success"/utf8>>, fun gleam@dynamic:bool/1),
        gleam@dynamic:field(
            <<"emails"/utf8>>,
            gleam@dynamic:list(email_decoder())
        ),
        gleam@dynamic:optional_field(
            <<"timestamp"/utf8>>,
            fun gleam@dynamic:string/1
        )
    ).

-spec send(plunk@instance:instance(), transactional_email()) -> gleam@http@request:request(binary()).
send(Instance, Mail) ->
    Body = begin
        _pipe = [{<<"to"/utf8>>, case erlang:element(2, Mail) of
                    {address, Addr} ->
                        gleam@json:string(Addr);

                    {addresses, Addrs} ->
                        gleam@json:array(Addrs, fun gleam@json:string/1)
                end}, {<<"subject"/utf8>>,
                gleam@json:string(erlang:element(3, Mail))}, {<<"body"/utf8>>,
                gleam@json:string(erlang:element(4, Mail))}],
        _pipe@1 = plunk@internal@utils:omit_if_none(
            _pipe,
            <<"name"/utf8>>,
            erlang:element(5, Mail),
            fun gleam@json:string/1
        ),
        _pipe@2 = plunk@internal@utils:omit_if_none(
            _pipe@1,
            <<"from"/utf8>>,
            erlang:element(6, Mail),
            fun gleam@json:string/1
        ),
        _pipe@3 = gleam@json:object(_pipe@2),
        gleam@json:to_string(_pipe@3)
    end,
    _pipe@4 = Instance,
    plunk@internal@bridge:make_request(_pipe@4, <<"/send"/utf8>>, post, Body).

-spec decode(gleam@http@response:response(binary())) -> {ok,
        send_transactional_email_response()} |
    {error, plunk@types:plunk_error()}.
decode(Res) ->
    _pipe = Res,
    plunk@internal@bridge:decode(_pipe, fun send_transactional_email_decoder/0).