package link

import (
	"encoding/json"
	"testing"
)

// A report's word on the assignment generation (novox/hq issue 234), as mesh-host's report writes it:
// `reads_generation` on every report of a node-engine that reads one, and `older_generation` on a refusal
// of a declaration composed from an older generation than the machine applied.
func TestTheGenerationOnTheWire(t *testing.T) {
	raw := []byte(`{"node":"anchor","refused":"older generation","declared":"d12","epoch":57,"sequence":12,` +
		`"report_sequence":8,"reads_generation":true,"older_generation":{"generation":38,"applied":40}}`)
	var r Report
	if err := json.Unmarshal(raw, &r); err != nil {
		t.Fatal(err)
	}
	if !r.ReadsGeneration || r.OlderGeneration == nil || *r.OlderGeneration != (GenerationRefusal{38, 40}) ||
		r.Sequence != 12 {
		t.Fatalf("a node-engine's generation refusal reads as %+v", r)
	}
	// Not a refusal by the lease's epoch: S13 counts those, and this one is raised naming its sender.
	if r.StaleRefusalOf() {
		t.Errorf("a generation refusal reads as a stale writer's")
	}
	var older Report
	if err := json.Unmarshal([]byte(`{"node":"anchor","applied":["a"],"report_sequence":3}`), &older); err != nil {
		t.Fatal(err)
	}
	if older.ReadsGeneration || older.OlderGeneration != nil {
		t.Fatalf("a node-engine that never said it reads a generation reads as one that does: %+v", older)
	}
}