package park

import (
	"errors"
	"testing"

	"github.com/carlosframework/platform/internal/hostclaim"
)

// TestLiveGenerationsWalksTheUnfinishedChain: the exported live set is the
// engine's own: with the marker lagging at g1 and the holder at g3, the
// unfinished cold chain g3 -> g2 -> g1 in the authoritative region is live;
// a region that is not authoritative has none; a missing claim refuses.
func TestLiveGenerationsWalksTheUnfinishedChain(t *testing.T) {
	loc := "instances/h.example"
	c := &hostclaim.Claim{Host: "h.example", Op: hostclaim.Op{Kind: hostclaim.KindServing}, Holder: &hostclaim.Holder{Location: loc, Generation: "g3",
		Admissions: []hostclaim.AdmissionRecord{
			{Generation: "g1", Mode: "cold", Region: "ie"},
			{Generation: "g2", Predecessor: "g1", Mode: "cold", Region: "ie", PredecessorRegion: "ie"},
			{Generation: "g3", Predecessor: "g2", Mode: "cold", Region: "ie", PredecessorRegion: "ie"},
		}}}
	v := View{Region: "ie", AuthoritativeRegion: "ie", MarkerKnown: true, MarkerGeneration: "g1", GenerationOf: func(Ref) (string, bool) { return "", true }}
	live, err := LiveGenerations(c, v, loc)
	if err != nil {
		t.Fatal(err)
	}
	for _, g := range []string{"g1", "g2", "g3"} {
		if !live[g] {
			t.Fatalf("live %v, missing %s", live, g)
		}
	}
	v.Region = "uk"
	if live, err := LiveGenerations(c, v, loc); err != nil || len(live) != 0 {
		t.Fatalf("a non-authoritative region: %v %v", live, err)
	}
	if _, err := LiveGenerations(nil, v, loc); !errors.Is(err, ErrUnsafe) {
		t.Fatalf("no claim: %v", err)
	}
}