-module(lightspeed@ops@durable_backend_harness).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/lightspeed/ops/durable_backend_harness.gleam").
-export([run_scenario/1, run_matrix/0, budget_version_label/0, scenario_label/1, pass_fail_label/1, signature/1, scenario/1, deterministic/1, outcomes/1, failed_scenarios/1, nondeterministic_failures/1, report_signature/1, snapshot_signature/0, snapshot_report_markdown/0]).
-export_type([scenario/0, scenario_outcome/0, report/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(" Deterministic durable-backend conformance harness for M49.\n").

-type scenario() :: expanded_durable_backend_matrix |
    takeover_fencing_recovery_semantics |
    external_dependency_pressure_evidence |
    continuity_slo_budget_certification |
    certification_artifact_determinism.

-type scenario_outcome() :: {scenario_outcome,
        scenario(),
        boolean(),
        boolean(),
        binary()}.

-type report() :: {report, list(scenario_outcome()), integer(), integer()}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 314).
-spec count_nondeterministic(list(scenario_outcome())) -> integer().
count_nondeterministic(Outcomes) ->
    case Outcomes of
        [] ->
            0;

        [Outcome | Rest] ->
            case erlang:element(4, Outcome) of
                true ->
                    count_nondeterministic(Rest);

                false ->
                    1 + count_nondeterministic(Rest)
            end
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 303).
-spec count_failed(list(scenario_outcome())) -> integer().
count_failed(Outcomes) ->
    case Outcomes of
        [] ->
            0;

        [Outcome | Rest] ->
            case erlang:element(3, Outcome) of
                true ->
                    count_failed(Rest);

                false ->
                    1 + count_failed(Rest)
            end
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 332).
-spec join_with(binary(), list(binary())) -> binary().
join_with(Separator, Values) ->
    case Values of
        [] ->
            <<""/utf8>>;

        [Value] ->
            Value;

        [Value@1 | Rest] ->
            <<<<Value@1/binary, Separator/binary>>/binary,
                (join_with(Separator, Rest))/binary>>
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 257).
-spec evaluate_certification_artifact_determinism() -> {boolean(), binary()}.
evaluate_certification_artifact_determinism() ->
    First = join_with(
        <<";"/utf8>>,
        gleam@list:map(
            lightspeed@cluster@durable_backend:expanded_backends(),
            fun(Backend) ->
                <<<<(lightspeed@cluster@durable_backend:name(Backend))/binary,
                        "|"/utf8>>/binary,
                    (lightspeed@cluster@durable_backend:artifact_signature(
                        lightspeed@cluster@durable_backend:artifact(Backend)
                    ))/binary>>
            end
        )
    ),
    Second = join_with(
        <<";"/utf8>>,
        gleam@list:map(
            lightspeed@cluster@durable_backend:expanded_backends(),
            fun(Backend@1) ->
                <<<<(lightspeed@cluster@durable_backend:name(Backend@1))/binary,
                        "|"/utf8>>/binary,
                    (lightspeed@cluster@durable_backend:artifact_signature(
                        lightspeed@cluster@durable_backend:artifact(Backend@1)
                    ))/binary>>
            end
        )
    ),
    Passed = First =:= Second,
    {Passed, First}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 237).
-spec evaluate_continuity_slo_budget_certification() -> {boolean(), binary()}.
evaluate_continuity_slo_budget_certification() ->
    Observations = lightspeed@cluster@durable_backend:run_pressure_matrix(),
    Budgets = lightspeed@cluster@durable_backend:default_slo_budgets(),
    Results = lightspeed@cluster@durable_backend:evaluate_slo_budget(
        Observations,
        Budgets
    ),
    Passed = lightspeed@cluster@durable_backend:budget_failures(Results) =:= 0,
    Signature = <<<<<<"observations="/utf8,
                (join_with(
                    <<";"/utf8>>,
                    gleam@list:map(
                        Observations,
                        fun lightspeed@cluster@durable_backend:observation_signature/1
                    )
                ))/binary>>/binary,
            "|budget_results="/utf8>>/binary,
        (join_with(
            <<";"/utf8>>,
            gleam@list:map(
                Results,
                fun lightspeed@cluster@durable_backend:budget_result_signature/1
            )
        ))/binary>>,
    {Passed, Signature}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 281).
-spec pressure_labels_signature(
    list(lightspeed@cluster@durable_backend:observation())
) -> binary().
pressure_labels_signature(Observations) ->
    Labels = gleam@list:map(
        Observations,
        fun(Observation) ->
            lightspeed@cluster@durable_backend:pressure_label(
                erlang:element(3, Observation)
            )
        end
    ),
    join_with(<<","/utf8>>, Labels).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 292).
-spec has_pressure(
    list(lightspeed@cluster@durable_backend:observation()),
    lightspeed@cluster@durable_backend:pressure_profile()
) -> boolean().
has_pressure(Observations, Pressure) ->
    case Observations of
        [] ->
            false;

        [Observation | Rest] ->
            (erlang:element(3, Observation) =:= Pressure) orelse has_pressure(
                Rest,
                Pressure
            )
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 222).
-spec evaluate_external_dependency_pressure_evidence() -> {boolean(), binary()}.
evaluate_external_dependency_pressure_evidence() ->
    Observations = lightspeed@cluster@durable_backend:run_pressure_matrix(),
    Passed = (has_pressure(Observations, nominal) andalso has_pressure(
        Observations,
        dependency_degraded
    ))
    andalso has_pressure(Observations, dependency_partitioned),
    Signature = <<<<<<"observations="/utf8,
                (erlang:integer_to_binary(erlang:length(Observations)))/binary>>/binary,
            "|pressure_labels="/utf8>>/binary,
        (pressure_labels_signature(Observations))/binary>>,
    {Passed, Signature}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 210).
-spec evaluate_takeover_fencing_recovery_semantics() -> {boolean(), binary()}.
evaluate_takeover_fencing_recovery_semantics() ->
    Observations = lightspeed@cluster@durable_backend:run_pressure_matrix(),
    Passed = lightspeed@cluster@durable_backend:takeover_fencing_recovery_certified(
        
    ),
    Signature = join_with(
        <<";"/utf8>>,
        gleam@list:map(
            Observations,
            fun lightspeed@cluster@durable_backend:observation_signature/1
        )
    ),
    {Passed, Signature}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 201).
-spec evaluate_expanded_durable_backend_matrix() -> {boolean(), binary()}.
evaluate_expanded_durable_backend_matrix() ->
    Backends = lightspeed@cluster@durable_backend:expanded_backends(),
    Passed = lightspeed@cluster@durable_backend:backend_matrix_certified()
    andalso (erlang:length(Backends) =:= 4),
    Signature = lightspeed@cluster@durable_backend:matrix_signature(),
    {Passed, Signature}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 187).
-spec evaluate(scenario()) -> {boolean(), binary()}.
evaluate(Scenario) ->
    case Scenario of
        expanded_durable_backend_matrix ->
            evaluate_expanded_durable_backend_matrix();

        takeover_fencing_recovery_semantics ->
            evaluate_takeover_fencing_recovery_semantics();

        external_dependency_pressure_evidence ->
            evaluate_external_dependency_pressure_evidence();

        continuity_slo_budget_certification ->
            evaluate_continuity_slo_budget_certification();

        certification_artifact_determinism ->
            evaluate_certification_artifact_determinism()
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 59).
?DOC(" Run one M49 scenario twice and require deterministic parity.\n").
-spec run_scenario(scenario()) -> scenario_outcome().
run_scenario(Scenario) ->
    {First_passed, First_signature} = evaluate(Scenario),
    {Second_passed, Second_signature} = evaluate(Scenario),
    Deterministic = (First_passed =:= Second_passed) andalso (First_signature
    =:= Second_signature),
    Passed = (First_passed andalso Second_passed) andalso Deterministic,
    {scenario_outcome, Scenario, Passed, Deterministic, First_signature}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 40).
?DOC(" Run all M49 scenarios.\n").
-spec run_matrix() -> report().
run_matrix() ->
    Outcomes = begin
        _pipe = [expanded_durable_backend_matrix,
            takeover_fencing_recovery_semantics,
            external_dependency_pressure_evidence,
            continuity_slo_budget_certification,
            certification_artifact_determinism],
        gleam@list:map(_pipe, fun run_scenario/1)
    end,
    {report, Outcomes, count_failed(Outcomes), count_nondeterministic(Outcomes)}.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 75).
?DOC(" M49 budget profile version label.\n").
-spec budget_version_label() -> binary().
budget_version_label() ->
    <<"m49.budget.v"/utf8, (erlang:integer_to_binary(1))/binary>>.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 80).
?DOC(" Scenario label.\n").
-spec scenario_label(scenario()) -> binary().
scenario_label(Scenario) ->
    case Scenario of
        expanded_durable_backend_matrix ->
            <<"expanded_durable_backend_matrix"/utf8>>;

        takeover_fencing_recovery_semantics ->
            <<"takeover_fencing_recovery_semantics"/utf8>>;

        external_dependency_pressure_evidence ->
            <<"external_dependency_pressure_evidence"/utf8>>;

        continuity_slo_budget_certification ->
            <<"continuity_slo_budget_certification"/utf8>>;

        certification_artifact_determinism ->
            <<"certification_artifact_determinism"/utf8>>
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 92).
?DOC(" Stable pass/fail label.\n").
-spec pass_fail_label(scenario_outcome()) -> binary().
pass_fail_label(Outcome) ->
    case erlang:element(3, Outcome) of
        true ->
            <<"pass"/utf8>>;

        false ->
            <<"fail"/utf8>>
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 100).
?DOC(" Scenario signature accessor.\n").
-spec signature(scenario_outcome()) -> binary().
signature(Outcome) ->
    erlang:element(5, Outcome).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 105).
?DOC(" Scenario accessor.\n").
-spec scenario(scenario_outcome()) -> scenario().
scenario(Outcome) ->
    erlang:element(2, Outcome).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 110).
?DOC(" Determinism accessor.\n").
-spec deterministic(scenario_outcome()) -> boolean().
deterministic(Outcome) ->
    erlang:element(4, Outcome).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 115).
?DOC(" Report outcomes accessor.\n").
-spec outcomes(report()) -> list(scenario_outcome()).
outcomes(Report) ->
    erlang:element(2, Report).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 120).
?DOC(" Failed scenario count.\n").
-spec failed_scenarios(report()) -> integer().
failed_scenarios(Report) ->
    erlang:element(3, Report).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 125).
?DOC(" Nondeterministic scenario count.\n").
-spec nondeterministic_failures(report()) -> integer().
nondeterministic_failures(Report) ->
    erlang:element(4, Report).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 325).
-spec bool_label(boolean()) -> binary().
bool_label(Value) ->
    case Value of
        true ->
            <<"true"/utf8>>;

        false ->
            <<"false"/utf8>>
    end.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 130).
?DOC(" Stable report signature.\n").
-spec report_signature(report()) -> binary().
report_signature(Report) ->
    Entries = gleam@list:map(
        erlang:element(2, Report),
        fun(Outcome) ->
            <<<<<<<<<<<<(scenario_label(erlang:element(2, Outcome)))/binary,
                                    "="/utf8>>/binary,
                                (pass_fail_label(Outcome))/binary>>/binary,
                            ":deterministic="/utf8>>/binary,
                        (bool_label(erlang:element(4, Outcome)))/binary>>/binary,
                    ":"/utf8>>/binary,
                (erlang:element(5, Outcome))/binary>>
        end
    ),
    join_with(<<";"/utf8>>, Entries).

-file("src/lightspeed/ops/durable_backend_harness.gleam", 146).
?DOC(" Deterministic snapshot signature for M49 fixture drift gates.\n").
-spec snapshot_signature() -> binary().
snapshot_signature() ->
    <<<<<<"m49.snapshot.v"/utf8, (erlang:integer_to_binary(1))/binary>>/binary,
            "|"/utf8>>/binary,
        (report_signature(run_matrix()))/binary>>.

-file("src/lightspeed/ops/durable_backend_harness.gleam", 154).
?DOC(" Deterministic markdown report for M49 fixture scripts.\n").
-spec snapshot_report_markdown() -> binary().
snapshot_report_markdown() ->
    Report = run_matrix(),
    Failed = failed_scenarios(Report),
    Nondeterministic = nondeterministic_failures(Report),
    Status = case (Failed =:= 0) andalso (Nondeterministic =:= 0) of
        true ->
            <<"OK"/utf8>>;

        false ->
            <<"FAIL"/utf8>>
    end,
    <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"# Durable Backend Fixture Report\n\n"/utf8,
                                                                                        "snapshot_version: "/utf8>>/binary,
                                                                                    (erlang:integer_to_binary(
                                                                                        1
                                                                                    ))/binary>>/binary,
                                                                                "\n"/utf8>>/binary,
                                                                            "budget_version: "/utf8>>/binary,
                                                                        (budget_version_label(
                                                                            
                                                                        ))/binary>>/binary,
                                                                    "\n"/utf8>>/binary,
                                                                "status: "/utf8>>/binary,
                                                            Status/binary>>/binary,
                                                        "\n"/utf8>>/binary,
                                                    "failed_scenarios: "/utf8>>/binary,
                                                (erlang:integer_to_binary(
                                                    Failed
                                                ))/binary>>/binary,
                                            "\n"/utf8>>/binary,
                                        "nondeterministic_failures: "/utf8>>/binary,
                                    (erlang:integer_to_binary(Nondeterministic))/binary>>/binary,
                                "\n\n"/utf8>>/binary,
                            "snapshot_signature: "/utf8>>/binary,
                        (snapshot_signature())/binary>>/binary,
                    "\n\n"/utf8>>/binary,
                "report_signature: "/utf8>>/binary,
            (report_signature(Report))/binary>>/binary,
        "\n"/utf8>>.