package buscompose

import (
	"fmt"
	"testing"
	"time"

	"github.com/nats-io/nats.go/jetstream"

	"git.novox.be/novox/mesh-sdk/go/seatdef"
)

// Defends issue 1790 (ADR 0547 §5): the grants part creates a declared bucket and stream as the controller asserts them.
func declaredStreamsAreCreatedAsTheControllerAssertsThem(t *testing.T) {
	plain := BucketStreamConfig(Bucket{Module: "mesh-vault", Name: "bus-accounts"})
	zero, seven, sixtyFour := 0, 7, 64
	defs := map[string]seatdef.Definition{
		"node-engine": {Seat: "node-engine", Events: []seatdef.Message{
			{Name: "running", Subject: "running.<node>.<module>", Keep: &seatdef.Keep{Object: true, MaxAgeDays: &zero, LastPerSubject: true}}, {Name: "composed"}}},
		"mesh-delivery": {Seat: "mesh-delivery", Events: []seatdef.Message{
			{Name: "owed", Subject: "owed.<repository>.<number>", Keep: &seatdef.Keep{Object: true, MaxAgeDays: &seven, MaxMiB: &sixtyFour}}}},
		"mesh-catalog": {Seat: "mesh-catalog", Events: []seatdef.Message{{Name: "registration-changed", Keep: &seatdef.Keep{Object: true}}}},
	}
	kept := KeptEventsOf(defs)
	byStream := map[string]jetstream.StreamConfig{}
	for _, k := range kept {
		byStream[k.Stream] = k.StreamConfig()
	}
	running, owed, named := byStream["SEAT_node-engine_running"], byStream["SEAT_mesh-delivery_owed"], byStream["SEAT_mesh-catalog_registration-changed"]
	rest, heard := SplitKept(kept, []string{"mesh-catalog.manifest-accepted", "node-engine.running.*.*", "node-engine.running"})
	heardConsumerCfg := ConsumerConfig(heardConsumer(Principal{Kind: KindModule, Node: "novox", Module: "mesh-grants"}, heard[0]))
	keyed := BucketStreamConfig(Bucket{Module: "m", Name: "presence", History: 5, TTLSeconds: 60, KeyTTL: true})
	queue := ModuleStreamConfig(ModuleStream{Module: "b", Name: "ASKS", Events: []string{"ask"}, MaxAgeDays: 7, MaxMiB: 32,
		WorkQueue: true, Duplicates: 1})
	for _, row := range []struct {
		what      string
		got, want any
	}{
		{"bucket name", plain.Name, "KV_mesh-vault_bus-accounts"},
		{"bucket subjects", plain.Subjects[0], "$KV.mesh-vault_bus-accounts.>"},
		{"bucket history defaults to one", plain.MaxMsgsPerSubject, int64(1)},
		{"bucket cap", plain.MaxBytes, int64(StateMaxBytes)},
		{"bucket value cap", plain.MaxMsgSize, int32(StateMaxValueBytes)},
		{"bucket duplicate window", plain.Duplicates, 2 * time.Minute},
		{"bucket discards new", plain.Discard, jetstream.DiscardNew},
		{"bucket direct and rollup, no delete", plain.AllowDirect && plain.AllowRollup && plain.DenyDelete, true},
		{"bucket without key ttl", plain.AllowMsgTTL, false},
		{"history", keyed.MaxMsgsPerSubject, int64(5)},
		{"age", keyed.MaxAge, time.Minute},
		{"duplicate window under the age", keyed.Duplicates, time.Minute},
		{"key ttl markers", keyed.SubjectDeleteMarkerTTL, KeyTTLMarkerTTL},
		{"key ttl", keyed.AllowMsgTTL, true},
		{"queue retention", queue.Retention, jetstream.WorkQueuePolicy},
		{"queue subjects", queue.Subjects[0], "mesh.stream.b.event.ask"},
		{"queue age", queue.MaxAge, 7 * 24 * time.Hour},
		{"queue cap", queue.MaxBytes, int64(32 << 20)},
		{"queue discards new", queue.Discard, jetstream.DiscardNew},
		{"queue duplicates", queue.Duplicates, time.Hour},
		{"queue metadata", queue.Metadata[WorkQueueMetadata] + queue.Metadata[RestrictedMetadata], "truetrue"},
		{"kept events are three", len(kept), 3},
		{"kept stream name", running.Name, "SEAT_node-engine_running"},
		{"a kept stream takes no subject of the shared stream", len(running.Subjects), 0},
		{"a kept stream sources the shared stream by the event's subject", running.Sources[0].Name + " " + running.Sources[0].FilterSubject,
			"EVENTS mesh.seat.node-engine.event.running.*.*"},
		{"last per subject holds one message a subject", running.MaxMsgsPerSubject, int64(1)},
		{"last per subject has no age", running.MaxAge, time.Duration(0)},
		{"a keep naming nothing is 90 days within 16 MiB, dropping its oldest", fmt.Sprint(named.MaxAge, named.MaxBytes, named.Discard == jetstream.DiscardOld),
			fmt.Sprint(90*24*time.Hour, int64(16<<20), true)},
		{"the stream kept for a week", owed.MaxAge, 7 * 24 * time.Hour},
		{"the stream kept within its size", owed.MaxBytes, int64(64 << 20)},
		{"its name is the bus's", owed.Name, "SEAT_mesh-delivery_owed"},
		{"a kept consume leaves the shared stream's", len(rest), 1},
		{"both namings of one event are one durable on its stream", heard[0].Stream + " " + fmt.Sprint(heard[0].Filters),
			"SEAT_node-engine_running [mesh.seat.node-engine.event.running.*.*]"},
		{"its durable starts at the last message of each subject", heardConsumerCfg.DeliverPolicy, jetstream.DeliverLastPerSubjectPolicy},
		{"its durable is the module's on the node", heardConsumerCfg.Durable, "novox_mesh-grants"},
	} {
		if row.got != row.want {
			t.Errorf("%s: %v, want %v", row.what, row.got, row.want)
		}
	}
}