-module(telega@testing@handler).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/telega/testing/handler.gleam").
-export([test_handler/3, with_test_bot_advanced_with_dependencies/4, with_test_bot_advanced/3, with_test_bot/3, with_test_bot_with_dependencies/4]).

-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(
    " Utilities for testing individual handlers in isolation and\n"
    " setting up full bot instances with minimal boilerplate.\n"
    "\n"
    " ```gleam\n"
    " import telega/testing/handler\n"
    " import telega/testing/factory\n"
    " import telega/testing/mock\n"
    "\n"
    " // Test a single handler without a router\n"
    " pub fn my_handler_test() {\n"
    "   let #(ctx, calls) = handler.test_handler(\n"
    "     session: MySession(count: 0),\n"
    "     update: factory.text_update(text: \"hello\"),\n"
    "     handler: fn(ctx, _update) { reply.with_text(ctx, \"hi\") |> result.map(fn(_) { ctx }) },\n"
    "   )\n"
    "   mock.assert_call_count(from: calls, expected: 1)\n"
    " }\n"
    "\n"
    " // Test with a full bot (router + actors)\n"
    " pub fn my_bot_test() {\n"
    "   handler.with_test_bot(\n"
    "     router: build_router(),\n"
    "     session: fn() { MySession(count: 0) },\n"
    "     handler: fn(bot_subject, calls) {\n"
    "       let update = factory.command_update(\"start\")\n"
    "       bot.handle_update(bot_subject:, update:)\n"
    "       mock.assert_call_count(from: calls, expected: 1)\n"
    "     },\n"
    "   )\n"
    " }\n"
    " ```\n"
).

-file("src/telega/testing/handler.gleam", 50).
?DOC(
    " Runs a handler function in isolation with a mock client.\n"
    " Returns the resulting context and the recorded API calls subject.\n"
    "\n"
    " Use this to test a single handler without involving the router or actor system.\n"
).
-spec test_handler(
    BEIE,
    telega@update:update(),
    fun((telega@bot:context(BEIE, BEIF, nil), telega@update:update()) -> {ok,
            telega@bot:context(BEIE, BEIF, nil)} |
        {error, BEIF})
) -> {{ok, telega@bot:context(BEIE, BEIF, nil)} | {error, BEIF},
    gleam@erlang@process:subject(telega@testing@mock:api_call())}.
test_handler(Session, Update, Handler) ->
    {Client, Calls} = telega@testing@mock:message_client(),
    Config = telega@testing@context:config_with_client(Client),
    Ctx = {context,
        <<"test_chat:123"/utf8>>,
        Update,
        Config,
        Session,
        nil,
        gleam@erlang@process:new_subject(),
        none,
        none,
        telega@testing@factory:bot_user()},
    Result = Handler(Ctx, Update),
    {Result, Calls}.

-file("src/telega/testing/handler.gleam", 127).
?DOC(
    " Lowest-level dependencies-aware bot harness: custom router handler, session settings,\n"
    " and injected `dependencies`. `with_test_bot` / `with_test_bot_with_dependencies` /\n"
    " `with_test_bot_advanced` all funnel through here.\n"
).
-spec with_test_bot_advanced_with_dependencies(
    fun((telega@bot:context(BEJU, BEJV, BEJW), telega@update:update()) -> {ok,
            telega@bot:context(BEJU, BEJV, BEJW)} |
        {error, BEJV}),
    telega@bot:session_settings(BEJU, BEJV),
    BEJW,
    fun((gleam@erlang@process:subject(telega@bot:bot_message()), gleam@erlang@process:subject(telega@testing@mock:api_call())) -> nil)
) -> nil.
with_test_bot_advanced_with_dependencies(
    Router_handler,
    Session_settings,
    Dependencies,
    Handler
) ->
    {Client, Calls} = telega@testing@mock:message_client(),
    Config = telega@testing@context:config_with_client(Client),
    Reg@1 = case telega@internal@registry:start(<<"test_handler"/utf8>>) of
        {ok, Reg} -> Reg;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Pattern match failed, no pattern matched the value."/utf8>>,
                        file => <<?FILEPATH/utf8>>,
                        module => <<"telega/testing/handler"/utf8>>,
                        function => <<"with_test_bot_advanced_with_dependencies"/utf8>>,
                        line => 139,
                        value => _assert_fail,
                        start => 4993,
                        'end' => 5044,
                        pattern_start => 5004,
                        pattern_end => 5011})
    end,
    Chat_factory_started@1 = case begin
        _pipe = gleam@otp@factory_supervisor:worker_child(
            fun telega@bot:start_chat_instance/1
        ),
        _pipe@1 = gleam@otp@factory_supervisor:restart_strategy(
            _pipe,
            transient
        ),
        gleam@otp@factory_supervisor:start(_pipe@1)
    end of
        {ok, Chat_factory_started} -> Chat_factory_started;
        _assert_fail@1 ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Pattern match failed, no pattern matched the value."/utf8>>,
                        file => <<?FILEPATH/utf8>>,
                        module => <<"telega/testing/handler"/utf8>>,
                        function => <<"with_test_bot_advanced_with_dependencies"/utf8>>,
                        line => 140,
                        value => _assert_fail@1,
                        start => 5047,
                        'end' => 5201,
                        pattern_start => 5058,
                        pattern_end => 5082})
    end,
    Started@1 = case telega@bot:start(
        Reg@1,
        Config,
        telega@testing@factory:bot_user(),
        Router_handler,
        [],
        Session_settings,
        fun(_, _) -> {ok, nil} end,
        Dependencies,
        erlang:element(3, Chat_factory_started@1),
        none
    ) of
        {ok, Started} -> Started;
        _assert_fail@2 ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Pattern match failed, no pattern matched the value."/utf8>>,
                        file => <<?FILEPATH/utf8>>,
                        module => <<"telega/testing/handler"/utf8>>,
                        function => <<"with_test_bot_advanced_with_dependencies"/utf8>>,
                        line => 145,
                        value => _assert_fail@2,
                        start => 5205,
                        'end' => 5529,
                        pattern_start => 5216,
                        pattern_end => 5227})
    end,
    Handler(erlang:element(3, Started@1), Calls),
    _ = telega@internal@registry:stop(Reg@1),
    nil.

-file("src/telega/testing/handler.gleam", 108).
?DOC(" Lower-level variant with custom router handler and session settings.\n").
-spec with_test_bot_advanced(
    fun((telega@bot:context(BEJH, BEJI, nil), telega@update:update()) -> {ok,
            telega@bot:context(BEJH, BEJI, nil)} |
        {error, BEJI}),
    telega@bot:session_settings(BEJH, BEJI),
    fun((gleam@erlang@process:subject(telega@bot:bot_message()), gleam@erlang@process:subject(telega@testing@mock:api_call())) -> nil)
) -> nil.
with_test_bot_advanced(Router_handler, Session_settings, Handler) ->
    with_test_bot_advanced_with_dependencies(
        Router_handler,
        Session_settings,
        nil,
        Handler
    ).

-file("src/telega/testing/handler.gleam", 78).
?DOC(
    " Starts a full bot with router, registry, and actors using a mock client.\n"
    " Calls `handler` with the bot subject and API calls subject, then cleans up.\n"
    "\n"
    " Use this to test end-to-end update handling with minimal boilerplate.\n"
).
-spec with_test_bot(
    telega@router:router(BEIU, any(), nil),
    fun(() -> BEIU),
    fun((gleam@erlang@process:subject(telega@bot:bot_message()), gleam@erlang@process:subject(telega@testing@mock:api_call())) -> nil)
) -> nil.
with_test_bot(Router, Default_session, Handler) ->
    with_test_bot_advanced(
        fun(Ctx, Update) -> telega@router:handle(Router, Ctx, Update) end,
        telega@testing@context:session_settings(Default_session),
        Handler
    ).

-file("src/telega/testing/handler.gleam", 93).
?DOC(
    " Like `with_test_bot`, but for a router whose handlers need injected\n"
    " dependencies (`dependencies`). Starts the bot with the given `dependencies` so handlers can\n"
    " read services from `ctx.dependencies`.\n"
).
-spec with_test_bot_with_dependencies(
    telega@router:router(BEJA, any(), BEJC),
    fun(() -> BEJA),
    BEJC,
    fun((gleam@erlang@process:subject(telega@bot:bot_message()), gleam@erlang@process:subject(telega@testing@mock:api_call())) -> nil)
) -> nil.
with_test_bot_with_dependencies(Router, Default_session, Dependencies, Handler) ->
    with_test_bot_advanced_with_dependencies(
        fun(Ctx, Update) -> telega@router:handle(Router, Ctx, Update) end,
        telega@testing@context:session_settings(Default_session),
        Dependencies,
        Handler
    ).