package engine

import "testing"

// TestFrozenScoringConstants pins the EXACT value of every scoring constant, not merely an invariant
// over them. TestWeightsSumToOne proves the six weights add to 1.00, but a redistribution (say
// clearance 0.30 and skills 0.20) still sums to 1.00 while silently changing every score. The platform
// is a shared, three tool product whose acceptance criterion is that the same candidate shows the same
// Match and Mission Readiness numbers in screenMATCH, slateMATCH, and missionMATCH, and that the
// weights and bands never change. This test is the guard: any edit to a weight, a band cut, the
// semantic threshold, or the model version fails the build, so a refactor that splits the one engine
// across three tool routers can never drift a number. Change a value here only with explicit
// instruction, and bump and register ModelVersion when you do.
func TestFrozenScoringConstants(t *testing.T) {
	cases := []struct {
		name string
		got  string
		want string
	}{
		{"WeightClearance", WeightClearance.String(), "0.25"},
		{"WeightSkills", WeightSkills.String(), "0.25"},
		{"WeightCerts", WeightCerts.String(), "0.15"},
		{"WeightCustomer", WeightCustomer.String(), "0.15"},
		{"WeightExperience", WeightExperience.String(), "0.1"},
		{"WeightLocation", WeightLocation.String(), "0.1"},
		{"BandGreenMin", BandGreenMin.String(), "90"},
		{"BandYellowMin", BandYellowMin.String(), "75"},
		{"DefaultSemanticThreshold", DefaultSemanticThreshold.String(), "0.62"},
	}
	for _, c := range cases {
		if c.got != c.want {
			t.Errorf("%s is %s, frozen value is %s: weights and bands must not change", c.name, c.got, c.want)
		}
	}
	if ModelVersion != "v1.4.0" {
		t.Errorf("ModelVersion is %q, frozen value is %q: bump it only when the weights, band cuts, or semantic threshold change, and register the new version", ModelVersion, "v1.4.0")
	}
}