package catalogue

import (
	"testing"
)

// A process resource may declare `bus` (novox/hq ADR 0436 §1): what it emits, the module's own work-queue
// streams it consumes, the module's own state it reads and writes, whether it reads the router's records of
// this module's own asks, and the tools and seat verbs it calls. The fixture is mesh-mail's future manifest
// shape (ADR 0436 §7, §8), copied from mesh-catalog/modules/mesh-mail/module.json and extended as settled by
// the lead: process id "send" is the manifest's own `id` (internal/catalogue/runtime.go:72-74 is the model for
// a process id); the account file uses the controller's real JSON tags (modules.go:1041-1056 issueWith).
func mailSenderProcessManifest(t *testing.T, bus string) string {
	t.Helper()
	process := `{"id":"send","type":"process","run":["./mesh-mail","send"],"user":"mesh-mail-send"`
	if bus != "" {
		process += `,"bus":` + bus
	}
	process += `}`
	// The stream itself is plain here, not retention work-queue: 1179 checks only that a process names a
	// stream the module owns, never its retention — that rule is 1178's (WorkQueueStreamProblems), and is
	// tested against its own fixture there (work_queue_consumer_test.go) so this one stays accepted whether
	// or not a process currently names "mail-sends" in bus.queues.
	return `{"module":"mesh-mail","version":"1","emits":["mail.send.sent","mail.send.failed"],` +
		`"state":["sends"],"streams":[{"name":"mail-sends","events":["mail.send.approved"],"max-age-days":1,` +
		`"max-mib":64}],"resources":[{"id":"account","type":"user","name":"mesh-mail-send"},` + process + `]}`
}

const mailSenderBus = `{"emits":["mail.send.sent","mail.send.failed"],"queues":["mail-sends"],` +
	`"state":["sends"],"asks":true,"invokes":["seat:operator-channel.tell"]}`

func strSliceEqual(a, b []string) bool {
	if len(a) != len(b) {
		return false
	}
	for i := range a {
		if a[i] != b[i] {
			return false
		}
	}
	return true
}

// 1179/AC5: a process declaring bus is composed with no bus key on the wire, and is otherwise byte for byte
// what main composes for the same process without bus.
func TestAProcessesBusNeverReachesTheWire(t *testing.T) {
	withBus, err := decodeForTest([]byte(mailSenderProcessManifest(t, mailSenderBus)))
	if err != nil {
		t.Fatal(err)
	}
	withoutBus, err := decodeForTest([]byte(mailSenderProcessManifest(t, "")))
	if err != nil {
		t.Fatal(err)
	}
	with := Rendering{Needed: map[string]map[string]string{}}
	outWith, err := Resolution{Node: "novox", Modules: []Manifest{withBus}}.Declaration(with)
	if err != nil {
		t.Fatalf("composing with bus: %v", err)
	}
	outWithout, err := Resolution{Node: "novox", Modules: []Manifest{withoutBus}}.Declaration(with)
	if err != nil {
		t.Fatalf("composing without bus: %v", err)
	}
	var withProcess, withoutProcess map[string]any
	for _, r := range outWith {
		if r["id"] == "mesh-mail.send" {
			withProcess = r
		}
	}
	for _, r := range outWithout {
		if r["id"] == "mesh-mail.send" {
			withoutProcess = r
		}
	}
	if withProcess == nil || withoutProcess == nil {
		t.Fatalf("the process was not composed at all: with=%v without=%v", withProcess, withoutProcess)
	}
	if _, has := withProcess["bus"]; has {
		t.Fatalf("the process resource carried a bus key onto the wire: %v", withProcess)
	}
	delete(withProcess, "bus")
	if !mapsEqual(withProcess, withoutProcess) {
		t.Fatalf("with bus declared, the process composed differently: %+v\nwant: %+v", withProcess, withoutProcess)
	}
}

func mapsEqual(a, b map[string]any) bool {
	if len(a) != len(b) {
		return false
	}
	for k, v := range a {
		bv, ok := b[k]
		if !ok {
			return false
		}
		if av, ok := v.([]any); ok {
			bbv, ok := bv.([]any)
			if !ok || len(av) != len(bbv) {
				return false
			}
			for i := range av {
				if av[i] != bbv[i] {
					return false
				}
			}
			continue
		}
		if v != bv {
			return false
		}
	}
	return true
}