-module(lustre@cli@dev).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([run/0]).
-export_type([error/0]).

-type error() :: build_error |
    {bundle_error, lustre@cli@esbuild:error()} |
    {main_missing, binary()} |
    {main_incorrect_type, binary(), lustre@cli@project:type()} |
    {main_bad_app_type, binary(), lustre@cli@project:type()} |
    {module_missing, binary()}.

-spec explain(error()) -> nil.
explain(Error) ->
    case Error of
        build_error ->
            lustre@cli@project:explain(build_error);

        {bundle_error, Error@1} ->
            lustre@cli@esbuild:explain(Error@1);

        {main_missing, Module} ->
            gleam@io:println(
                <<<<"
Module `"/utf8, Module/binary>>/binary,
                    "` doesn't have a public `main` function I can preview."/utf8>>
            );

        {main_incorrect_type, Module@1, Type_} ->
            gleam@io:println(
                <<<<<<<<"
I cannot preview the `main` function exposed by module `"/utf8,
                                Module@1/binary>>/binary,
                            "`.
To start a preview server I need it to take no arguments and return a Lustre
`App`.
The one I found has type `"/utf8>>/binary,
                        (lustre@cli@project:type_to_string(Type_))/binary>>/binary,
                    "`."/utf8>>
            );

        {main_bad_app_type, Module@2, Type_@1} ->
            gleam@io:println(
                <<<<<<<<"
I cannot preview the `main` function exposed by module `"/utf8,
                                Module@2/binary>>/binary,
                            "`.
To start a preview server I need it to return a Lustre `App` that doesn't need
any flags.
The one I found has type `"/utf8>>/binary,
                        (lustre@cli@project:type_to_string(Type_@1))/binary>>/binary,
                    "`.

Its return type should look something like this:

  import lustre.{type App}
  pub fn main() -> App(flags, model, msg) {
    todo as \"your Lustre application to preview\"
  }"/utf8>>
            );

        {module_missing, Module@3} ->
            gleam@io:println(
                <<<<"
I couldn't find a public module called `"/utf8,
                        Module@3/binary>>/binary,
                    "` in your project."/utf8>>
            )
    end.

-spec index_html(binary(), binary(), boolean()) -> binary().
index_html(App_name, Container_id, Include_styles) ->
    Styles = case Include_styles of
        true ->
            lustre@element@html:link(
                [lustre@attribute:rel(<<"stylesheet"/utf8>>),
                    lustre@attribute:href(
                        <<"https://cdn.jsdelivr.net/gh/lustre-labs/ui/priv/styles.css"/utf8>>
                    )]
            );

        false ->
            lustre@element:none()
    end,
    _pipe = lustre@element@html:html(
        [],
        [lustre@element@html:head(
                [],
                [lustre@element@html:meta(
                        [lustre@attribute:attribute(
                                <<"charset"/utf8>>,
                                <<"utf-8"/utf8>>
                            )]
                    ),
                    lustre@element@html:meta(
                        [lustre@attribute:attribute(
                                <<"name"/utf8>>,
                                <<"viewport"/utf8>>
                            ),
                            lustre@attribute:attribute(
                                <<"content"/utf8>>,
                                <<"width=device-width, initial-scale=1"/utf8>>
                            )]
                    ),
                    lustre@element@html:title([], App_name),
                    lustre@element@html:script(
                        [lustre@attribute:type_(<<"module"/utf8>>),
                            lustre@attribute:src(<<"./index.mjs"/utf8>>)],
                        <<""/utf8>>
                    ),
                    Styles]
            ),
            lustre@element@html:body(
                [],
                [lustre@element@html:'div'(
                        [lustre@attribute:id(Container_id)],
                        []
                    )]
            )]
    ),
    _pipe@1 = lustre@element:to_string(_pipe),
    gleam@string:append(<<"<!DOCTYPE html>"/utf8>>, _pipe@1).

-spec is_nil_type(lustre@cli@project:type()) -> boolean().
is_nil_type(T) ->
    case T of
        {named, <<"Nil"/utf8>>, <<""/utf8>>, <<"gleam"/utf8>>, []} ->
            true;

        _ ->
            false
    end.

-spec is_type_variable(lustre@cli@project:type()) -> boolean().
is_type_variable(T) ->
    case T of
        {variable, _} ->
            true;

        _ ->
            false
    end.

-spec is_compatible_flags_type(lustre@cli@project:type()) -> boolean().
is_compatible_flags_type(T) ->
    is_nil_type(T) orelse is_type_variable(T).

-spec check_is_lustre_app(binary(), lustre@cli@project:module_()) -> {ok,
        boolean()} |
    {error, error()}.
check_is_lustre_app(Module_path, Module) ->
    lustre@cli@utils:'try'(
        gleam@dict:get(erlang:element(3, Module), <<"main"/utf8>>),
        lustre@cli@utils:replace({main_missing, Module_path}),
        fun(Main) ->
            lustre@cli@utils:guard(
                erlang:element(2, Main) /= [],
                {main_incorrect_type,
                    Module_path,
                    {fn, erlang:element(2, Main), erlang:element(3, Main)}},
                fun() -> case erlang:element(3, Main) of
                        {named,
                            <<"App"/utf8>>,
                            <<"lustre"/utf8>>,
                            <<"lustre"/utf8>>,
                            [Flags | _]} ->
                            case is_compatible_flags_type(Flags) of
                                true ->
                                    {ok, true};

                                false ->
                                    {error,
                                        {main_bad_app_type,
                                            Module_path,
                                            erlang:element(3, Main)}}
                            end;

                        _ ->
                            {ok, false}
                    end end
            )
        end
    ).

-spec run() -> glint:command(nil).
run() ->
    Description = <<"
    "/utf8>>,
    _pipe@2 = glint:command(
        fun(Input) ->
            {command_input, _, Flags, _} = Input,
            _assert_subject = glint@flag:get_string(Flags, <<"host"/utf8>>),
            {ok, Host} = case _assert_subject of
                {ok, _} -> _assert_subject;
                _assert_fail ->
                    erlang:error(#{gleam_error => let_assert,
                                message => <<"Assertion pattern match failed"/utf8>>,
                                value => _assert_fail,
                                module => <<"lustre/cli/dev"/utf8>>,
                                function => <<"run"/utf8>>,
                                line => 27})
            end,
            _assert_subject@1 = glint@flag:get_string(Flags, <<"port"/utf8>>),
            {ok, Port} = case _assert_subject@1 of
                {ok, _} -> _assert_subject@1;
                _assert_fail@1 ->
                    erlang:error(#{gleam_error => let_assert,
                                message => <<"Assertion pattern match failed"/utf8>>,
                                value => _assert_fail@1,
                                module => <<"lustre/cli/dev"/utf8>>,
                                function => <<"run"/utf8>>,
                                line => 28})
            end,
            _assert_subject@2 = glint@flag:get_bool(
                Flags,
                <<"include-styles"/utf8>>
            ),
            {ok, Include_styles} = case _assert_subject@2 of
                {ok, _} -> _assert_subject@2;
                _assert_fail@2 ->
                    erlang:error(#{gleam_error => let_assert,
                                message => <<"Assertion pattern match failed"/utf8>>,
                                value => _assert_fail@2,
                                module => <<"lustre/cli/dev"/utf8>>,
                                function => <<"run"/utf8>>,
                                line => 29})
            end,
            Script = (lustre@cli@step:new(
                <<"Building your project"/utf8>>,
                fun() ->
                    lustre@cli@step:'try'(
                        lustre@cli@project:interface(),
                        lustre@cli@utils:replace(build_error),
                        fun(Interface) ->
                            lustre@cli@step:'try'(
                                gleam@dict:get(
                                    erlang:element(4, Interface),
                                    erlang:element(2, Interface)
                                ),
                                lustre@cli@utils:replace(
                                    {module_missing,
                                        erlang:element(2, Interface)}
                                ),
                                fun(Module) ->
                                    lustre@cli@step:'try'(
                                        check_is_lustre_app(
                                            erlang:element(2, Interface),
                                            Module
                                        ),
                                        fun gleam@function:identity/1,
                                        fun(Is_app) ->
                                            lustre@cli@step:done(
                                                <<"✅ Project compiled successfully"/utf8>>,
                                                fun() ->
                                                    lustre@cli@step:new(
                                                        <<"Creating the application entry point"/utf8>>,
                                                        fun() ->
                                                            Root = lustre@cli@project:root(
                                                                
                                                            ),
                                                            Tempdir = filepath:join(
                                                                Root,
                                                                <<"build/.lustre"/utf8>>
                                                            ),
                                                            _ = simplifile:create_directory_all(
                                                                Tempdir
                                                            ),
                                                            Entry = begin
                                                                _pipe = case Is_app of
                                                                    true ->
                                                                        <<" import { start } from '../dev/javascript/lustre/lustre.mjs';
              import { main } from '../dev/javascript/${app_name}/${app_name}.mjs';

              start(main(), ${container_id});
            "/utf8>>;

                                                                    false ->
                                                                        <<" import { main } from '../dev/javascript/${app_name}/${app_name}.mjs';

              main();
          "/utf8>>
                                                                end,
                                                                _pipe@1 = gleam@string:replace(
                                                                    _pipe,
                                                                    <<"${app_name}"/utf8>>,
                                                                    erlang:element(
                                                                        2,
                                                                        Interface
                                                                    )
                                                                ),
                                                                gleam@string:replace(
                                                                    _pipe@1,
                                                                    <<"${container_id}"/utf8>>,
                                                                    <<"app"/utf8>>
                                                                )
                                                            end,
                                                            Html = index_html(
                                                                erlang:element(
                                                                    2,
                                                                    Interface
                                                                ),
                                                                <<"app"/utf8>>,
                                                                Include_styles
                                                            ),
                                                            _assert_subject@3 = simplifile:write(
                                                                <<Tempdir/binary,
                                                                    "/entry.mjs"/utf8>>,
                                                                Entry
                                                            ),
                                                            {ok, _} = case _assert_subject@3 of
                                                                {ok, _} -> _assert_subject@3;
                                                                _assert_fail@3 ->
                                                                    erlang:error(
                                                                            #{gleam_error => let_assert,
                                                                                message => <<"Assertion pattern match failed"/utf8>>,
                                                                                value => _assert_fail@3,
                                                                                module => <<"lustre/cli/dev"/utf8>>,
                                                                                function => <<"run"/utf8>>,
                                                                                line => 65}
                                                                        )
                                                            end,
                                                            _assert_subject@4 = simplifile:write(
                                                                <<Tempdir/binary,
                                                                    "/index.html"/utf8>>,
                                                                Html
                                                            ),
                                                            {ok, _} = case _assert_subject@4 of
                                                                {ok, _} -> _assert_subject@4;
                                                                _assert_fail@4 ->
                                                                    erlang:error(
                                                                            #{gleam_error => let_assert,
                                                                                message => <<"Assertion pattern match failed"/utf8>>,
                                                                                value => _assert_fail@4,
                                                                                module => <<"lustre/cli/dev"/utf8>>,
                                                                                function => <<"run"/utf8>>,
                                                                                line => 66}
                                                                        )
                                                            end,
                                                            lustre@cli@step:run(
                                                                lustre@cli@esbuild:bundle(
                                                                    filepath:join(
                                                                        Tempdir,
                                                                        <<"entry.mjs"/utf8>>
                                                                    ),
                                                                    filepath:join(
                                                                        Tempdir,
                                                                        <<"index.mjs"/utf8>>
                                                                    ),
                                                                    false
                                                                ),
                                                                lustre@cli@utils:map(
                                                                    fun(Field@0) -> {bundle_error, Field@0} end
                                                                ),
                                                                fun(_) ->
                                                                    lustre@cli@step:run(
                                                                        lustre@cli@esbuild:serve(
                                                                            Host,
                                                                            Port
                                                                        ),
                                                                        lustre@cli@utils:map(
                                                                            fun(Field@0) -> {bundle_error, Field@0} end
                                                                        ),
                                                                        fun(_) ->
                                                                            lustre@cli@step:return(
                                                                                nil
                                                                            )
                                                                        end
                                                                    )
                                                                end
                                                            )
                                                        end
                                                    )
                                                end
                                            )
                                        end
                                    )
                                end
                            )
                        end
                    )
                end
            )),
            case lustre@cli@step:execute(Script) of
                {ok, _} ->
                    nil;

                {error, Error} ->
                    explain(Error)
            end
        end
    ),
    _pipe@3 = glint:description(_pipe@2, Description),
    _pipe@4 = glint:unnamed_args(_pipe@3, {eq_args, 0}),
    _pipe@7 = glint:flag(
        _pipe@4,
        <<"host"/utf8>>,
        begin
            Description@1 = <<""/utf8>>,
            Default = <<"0.0.0.0"/utf8>>,
            _pipe@5 = glint@flag:string(),
            _pipe@6 = glint@flag:default(_pipe@5, Default),
            glint@flag:description(_pipe@6, Description@1)
        end
    ),
    _pipe@10 = glint:flag(
        _pipe@7,
        <<"port"/utf8>>,
        begin
            Description@2 = <<""/utf8>>,
            Default@1 = <<"1234"/utf8>>,
            _pipe@8 = glint@flag:string(),
            _pipe@9 = glint@flag:default(_pipe@8, Default@1),
            glint@flag:description(_pipe@9, Description@2)
        end
    ),
    glint:flag(
        _pipe@10,
        <<"include-styles"/utf8>>,
        begin
            Description@3 = <<""/utf8>>,
            Default@2 = false,
            _pipe@11 = glint@flag:bool(),
            _pipe@12 = glint@flag:default(_pipe@11, Default@2),
            glint@flag:description(_pipe@12, Description@3)
        end
    ).