-module(dream_test@gherkin@discover).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/dream_test/gherkin/discover.gleam").
-export([features/1, with_registry/2, to_suite/2, load/1, list_files/1]).
-export_type([feature_discovery/0, load_result/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.

?MODULEDOC(
    " Discover and load Gherkin `.feature` files.\n"
    "\n"
    " Use this module to:\n"
    " - find `.feature` files via a glob pattern\n"
    " - parse them (`load`) for inspection, or\n"
    " - convert them into runnable `TestSuite`s (`to_suite`) when you provide a\n"
    "   step registry (your Given/When/Then handlers).\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " import dream_test/gherkin/discover\n"
    " import dream_test/gherkin/steps.{type StepContext, get_int, step}\n"
    " import dream_test/gherkin/world.{get_or, put}\n"
    " import dream_test/matchers.{be_equal, or_fail_with, should, succeed}\n"
    " import gleam/result\n"
    "\n"
    " fn step_server_running(context: StepContext) {\n"
    "   put(context.world, \"server_running\", True)\n"
    "   Ok(succeed())\n"
    " }\n"
    "\n"
    " fn step_empty_cart(context: StepContext) {\n"
    "   put(context.world, \"cart\", 0)\n"
    "   Ok(succeed())\n"
    " }\n"
    "\n"
    " fn step_add_items(context: StepContext) {\n"
    "   let current = get_or(context.world, \"cart\", 0)\n"
    "   let to_add = get_int(context.captures, 0) |> result.unwrap(0)\n"
    "   put(context.world, \"cart\", current + to_add)\n"
    "   Ok(succeed())\n"
    " }\n"
    "\n"
    " fn step_verify_count(context: StepContext) {\n"
    "   let expected = get_int(context.captures, 0) |> result.unwrap(0)\n"
    "   get_or(context.world, \"cart\", 0)\n"
    "   |> should\n"
    "   |> be_equal(expected)\n"
    "   |> or_fail_with(\"Cart count mismatch\")\n"
    " }\n"
    "\n"
    " pub fn tests() {\n"
    "   // Define step handlers\n"
    "   let steps =\n"
    "     steps.new()\n"
    "     |> step(\"the server is running\", step_server_running)\n"
    "     |> step(\"the cart is empty\", step_empty_cart)\n"
    "     |> step(\"I add {int} items\", step_add_items)\n"
    "     |> step(\"the cart should have {int} items\", step_verify_count)\n"
    "\n"
    "   // Discover and load all .feature files\n"
    "   discover.features(\"test/*.feature\")\n"
    "   |> discover.with_registry(steps)\n"
    "   |> discover.to_suite(\"cart_features\")\n"
    " }\n"
    " ```\n"
).

-opaque feature_discovery() :: {feature_discovery,
        binary(),
        gleam@option:option(dream_test@gherkin@steps:step_registry()),
        list(dream_test@gherkin@types:feature()),
        list(binary())}.

-type load_result() :: {load_result,
        list(dream_test@gherkin@types:feature()),
        list(binary())}.

-file("src/dream_test/gherkin/discover.gleam", 128).
?DOC(
    " Start discovering features matching a glob pattern.\n"
    "\n"
    " Use Erlang’s `filelib:wildcard/1` semantics (see `wildcard/1` below).\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " discover.features(\"test/*.feature\")\n"
    " ```\n"
    "\n"
    " ## Parameters\n"
    "\n"
    " - `pattern`: glob pattern used to find `.feature` files\n"
    "\n"
    " ## Returns\n"
    "\n"
    " A `FeatureDiscovery` builder you can pipe into `with_registry`, `load`,\n"
    " `list_files`, or `to_suite`.\n"
).
-spec features(binary()) -> feature_discovery().
features(Pattern) ->
    {feature_discovery, Pattern, none, [], []}.

-file("src/dream_test/gherkin/discover.gleam", 162).
?DOC(
    " Attach a step registry to the discovery.\n"
    "\n"
    " The step registry is the set of step definitions (Given/When/Then handlers)\n"
    " used to execute scenarios. It is required before calling `to_suite`.\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " // Define step handlers\n"
    " let steps =\n"
    "   steps.new()\n"
    "   |> step(\"the server is running\", step_server_running)\n"
    "   |> step(\"the cart is empty\", step_empty_cart)\n"
    "   |> step(\"I add {int} items\", step_add_items)\n"
    "   |> step(\"the cart should have {int} items\", step_verify_count)\n"
    "\n"
    " // Discover and load all .feature files\n"
    " discover.features(\"test/*.feature\")\n"
    " |> discover.with_registry(steps)\n"
    " |> discover.to_suite(\"cart_features\")\n"
    " ```\n"
    "\n"
    " ## Parameters\n"
    "\n"
    " - `discovery`: a `FeatureDiscovery` created with `features`\n"
    " - `registry`: step definitions used to execute scenarios\n"
    "\n"
    " ## Returns\n"
    "\n"
    " The updated discovery.\n"
).
-spec with_registry(
    feature_discovery(),
    dream_test@gherkin@steps:step_registry()
) -> feature_discovery().
with_registry(Discovery, Registry) ->
    {feature_discovery,
        erlang:element(2, Discovery),
        {some, Registry},
        erlang:element(4, Discovery),
        erlang:element(5, Discovery)}.

-file("src/dream_test/gherkin/discover.gleam", 312).
-spec parse_feature_file(binary()) -> {ok, dream_test@gherkin@types:feature()} |
    {error, binary()}.
parse_feature_file(Path) ->
    case dream_test@gherkin@parser:parse_file(Path) of
        {ok, Feature} ->
            {ok, Feature};

        {error, E} ->
            {error, <<<<Path/binary, ": "/utf8>>/binary, E/binary>>}
    end.

-file("src/dream_test/gherkin/discover.gleam", 290).
-spec load_all_features_loop(
    list(binary()),
    list(dream_test@gherkin@types:feature()),
    list(binary())
) -> load_result().
load_all_features_loop(Files, Features_rev, Errors_rev) ->
    case Files of
        [] ->
            {load_result,
                lists:reverse(Features_rev),
                lists:reverse(Errors_rev)};

        [Path | Rest] ->
            case parse_feature_file(Path) of
                {ok, Feature} ->
                    load_all_features_loop(
                        Rest,
                        [Feature | Features_rev],
                        Errors_rev
                    );

                {error, Error} ->
                    load_all_features_loop(
                        Rest,
                        Features_rev,
                        [Error | Errors_rev]
                    )
            end
    end.

-file("src/dream_test/gherkin/discover.gleam", 286).
-spec load_all_features(list(binary())) -> load_result().
load_all_features(Files) ->
    load_all_features_loop(Files, [], []).

-file("src/dream_test/gherkin/discover.gleam", 333).
-spec parse_error_assertion() -> dream_test@types:assertion_result().
parse_error_assertion() ->
    {assertion_failed,
        {assertion_failure,
            <<"parse"/utf8>>,
            <<"Failed to parse feature file (see test name for details)"/utf8>>,
            none}}.

-file("src/dream_test/gherkin/discover.gleam", 329).
-spec parse_error_test_run(nil) -> {ok, dream_test@types:assertion_result()} |
    {error, binary()}.
parse_error_test_run(_) ->
    {ok, parse_error_assertion()}.

-file("src/dream_test/gherkin/discover.gleam", 319).
-spec error_to_node(binary()) -> dream_test@types:node_(nil).
error_to_node(Error) ->
    {test,
        <<"Parse Error: "/utf8, Error/binary>>,
        [<<"parse-error"/utf8>>],
        unit,
        fun parse_error_test_run/1,
        none}.

-file("src/dream_test/gherkin/discover.gleam", 364).
-spec errors_to_nodes(list(binary()), list(dream_test@types:node_(nil))) -> list(dream_test@types:node_(nil)).
errors_to_nodes(Errors, Acc_rev) ->
    case Errors of
        [] ->
            lists:reverse(Acc_rev);

        [Error | Rest] ->
            errors_to_nodes(Rest, [error_to_node(Error) | Acc_rev])
    end.

-file("src/dream_test/gherkin/discover.gleam", 374).
-spec root_to_group(dream_test@types:root(nil)) -> dream_test@types:node_(nil).
root_to_group(Suite) ->
    {root, _, Tree} = Suite,
    Tree.

-file("src/dream_test/gherkin/discover.gleam", 355).
-spec feature_to_group(
    dream_test@gherkin@types:feature(),
    dream_test@gherkin@steps:step_registry()
) -> dream_test@types:node_(nil).
feature_to_group(Feature, Registry) ->
    Config = {feature_config, Feature, Registry},
    Feature_suite = dream_test@gherkin@feature:to_test_suite(Config),
    root_to_group(Feature_suite).

-file("src/dream_test/gherkin/discover.gleam", 341).
-spec features_to_groups(
    list(dream_test@gherkin@types:feature()),
    dream_test@gherkin@steps:step_registry(),
    list(dream_test@types:node_(nil))
) -> list(dream_test@types:node_(nil)).
features_to_groups(Features, Registry, Acc_rev) ->
    case Features of
        [] ->
            lists:reverse(Acc_rev);

        [Feature | Rest] ->
            Group = feature_to_group(Feature, Registry),
            features_to_groups(Rest, Registry, [Group | Acc_rev])
    end.

-file("src/dream_test/gherkin/discover.gleam", 282).
-spec discover_files(binary()) -> list(binary()).
discover_files(Pattern) ->
    dream_test_gherkin_discover_ffi:wildcard(Pattern).

-file("src/dream_test/gherkin/discover.gleam", 199).
?DOC(
    " Build a TestSuite from discovered features.\n"
    "\n"
    " Panics if `with_registry()` was not called.\n"
    "\n"
    " Parse errors are converted into failing unit tests tagged with\n"
    " `\"parse-error\"`.\n"
    "\n"
    " ## What does this produce?\n"
    "\n"
    " The returned suite contains one test per scenario. Each test runs the\n"
    " scenario’s steps using the provided step registry.\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " // Discover and load all .feature files\n"
    " discover.features(\"test/*.feature\")\n"
    " |> discover.with_registry(steps)\n"
    " |> discover.to_suite(\"cart_features\")\n"
    " ```\n"
    "\n"
    " ## Parameters\n"
    "\n"
    " - `discovery`: a `FeatureDiscovery` with a registry attached via `with_registry`\n"
    " - `suite_name`: name to show for the top-level suite/group in reports\n"
    "\n"
    " ## Returns\n"
    "\n"
    " A `TestSuite(Nil)` containing one test per discovered scenario, plus failing\n"
    " tests for any parse errors (tagged `\"parse-error\"`).\n"
).
-spec to_suite(feature_discovery(), binary()) -> dream_test@types:root(nil).
to_suite(Discovery, Suite_name) ->
    Registry = case erlang:element(3, Discovery) of
        {some, R} ->
            R;

        none ->
            erlang:error(#{gleam_error => panic,
                    message => <<"FeatureDiscovery requires a registry. Call with_registry() first."/utf8>>,
                    file => <<?FILEPATH/utf8>>,
                    module => <<"dream_test/gherkin/discover"/utf8>>,
                    function => <<"to_suite"/utf8>>,
                    line => 206})
    end,
    Files = discover_files(erlang:element(2, Discovery)),
    Load_result = load_all_features(Files),
    Children = features_to_groups(erlang:element(2, Load_result), Registry, []),
    Error_nodes = errors_to_nodes(erlang:element(3, Load_result), []),
    {root, nil, {group, Suite_name, [], lists:append(Children, Error_nodes)}}.

-file("src/dream_test/gherkin/discover.gleam", 248).
?DOC(
    " Load features and return detailed results.\n"
    "\n"
    " This does **not** require a step registry because it only discovers files\n"
    " and parses Gherkin syntax. Step definitions are only needed when you want to\n"
    " execute scenarios (`to_suite`).\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " let result = discover.features(\"test/*.feature\") |> discover.load()\n"
    "\n"
    " result.features\n"
    " |> should\n"
    " |> have_length(1)\n"
    " |> or_fail_with(\"expected one parsed feature\")\n"
    " ```\n"
    "\n"
    " ## Parameters\n"
    "\n"
    " - `discovery`: a `FeatureDiscovery` created with `features`\n"
    "\n"
    " ## Returns\n"
    "\n"
    " A `LoadResult` containing parsed features and any parse errors.\n"
).
-spec load(feature_discovery()) -> load_result().
load(Discovery) ->
    Files = discover_files(erlang:element(2, Discovery)),
    load_all_features(Files).

-file("src/dream_test/gherkin/discover.gleam", 274).
?DOC(
    " Get the list of files matching the discovery pattern.\n"
    "\n"
    " This is a pure discovery step; files are not parsed.\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " discover.features(\"test/*.feature\")\n"
    " |> discover.list_files()\n"
    " |> should\n"
    " |> contain(\"test/cart.feature\")\n"
    " |> or_fail_with(\"expected list_files to include test/cart.feature\")\n"
    " ```\n"
    "\n"
    " ## Parameters\n"
    "\n"
    " - `discovery`: a `FeatureDiscovery` created with `features`\n"
    "\n"
    " ## Returns\n"
    "\n"
    " A list of file paths matching the glob pattern.\n"
).
-spec list_files(feature_discovery()) -> list(binary()).
list_files(Discovery) ->
    discover_files(erlang:element(2, Discovery)).