package resolution

import (
	"strings"
	"testing"

	mcat "git.novox.be/novox/mesh-sdk/go/catalogue"
)

const aRegistryForge = `{"module":"forge","version":"1","requires":["route"],
  "provides":[{"name":"npm-package-registry","scope":"mesh"}],
  "contributes":{"route":{"web":{"label":"git","port":3000}}},
  "serves":{"npm-package-registry":{"scheme":"http","port":3000,"npm-path":"/api/packages/novox/npm/",
    "public-root":"https://${bound:route:name-web}/api/packages/novox/npm/"}}}`

func aForgeManifest(t *testing.T) mcat.Manifest {
	t.Helper()
	m, err := decodeForTest([]byte(aRegistryForge))
	if err != nil {
		t.Fatal(err)
	}
	return m
}

func TestAProviderServesItsOwnComposedName(t *testing.T) {
	m := aForgeManifest(t)
	r := mcat.Resolution{Node: "home", PublicDomain: "example.org"}
	got, said, err := ServedOwnNames(r, m, "npm-package-registry", m.Serves["npm-package-registry"], nil)
	if err != nil {
		t.Fatal(err)
	}
	if got["public-root"] != "https://git.example.org/api/packages/novox/npm/" || len(said) != 0 {
		t.Fatalf("the public root is the route's composed name: %v, said %v", got, said)
	}
	if got["npm-path"] != "/api/packages/novox/npm/" || got["port"] != float64(3000) {
		t.Fatalf("the rest is served as it was: %v", got)
	}
	if m.Serves["npm-package-registry"]["public-root"] != "https://${bound:route:name-web}/api/packages/novox/npm/" {
		t.Fatal("the manifest's own map was rewritten")
	}
}

// On the provider's own machine the consumer is served the same name (ADR 0346 §2).
func TestAConsumerBesideTheProviderIsServedItsName(t *testing.T) {
	m := aForgeManifest(t)
	consumer := mcat.Manifest{Module: "lab", Version: "1", Requires: []string{"npm-package-registry"},
		Binds: map[string]string{"npm-package-registry": "/var/lib/lab/package-registry.json"}}
	node := workstation()
	node.PublicDomain = "example.org"
	got, err := Resolve(shelf(minimalRouteProxy(), m, consumer), []string{"route-proxy", "forge", "lab"}, node, mcat.World{})
	if err != nil {
		t.Fatal(err)
	}
	served, answered, err := resolutionServedOnThisMachine(got, "npm-package-registry", mcat.Rendering{})
	if err != nil || !answered {
		t.Fatalf("answered %v: %v", answered, err)
	}
	if served["public-root"] != "https://git.example.org/api/packages/novox/npm/" {
		t.Fatalf("served beside the provider: %v", served)
	}
	out, err := Declaration(got, mcat.Rendering{})
	if err != nil {
		t.Fatal(err)
	}
	var binding string
	for _, r := range out {
		if r["path"] == "/var/lib/lab/package-registry.json" {
			binding, _ = r["content"].(string)
		}
	}
	if !strings.Contains(binding, `"public-root": "https://git.example.org/api/packages/novox/npm/"`) &&
		!strings.Contains(binding, `"public-root":"https://git.example.org/api/packages/novox/npm/"`) {
		t.Fatalf("the consumer's binding carries the name:\n%s", binding)
	}
	if strings.Contains(binding, "${bound:") {
		t.Fatalf("a placeholder reached the consumer:\n%s", binding)
	}
}

// From another machine, the provider's served values carry what that machine composed, and a key it
// left out is said on the consumer's need (ADR 0346 §2, §3).
func TestAConsumerElsewhereIsToldWhatTheProviderLeftOut(t *testing.T) {
	consumer := mcat.Manifest{Module: "lab", Version: "1", Requires: []string{"npm-package-registry"},
		Binds: map[string]string{"npm-package-registry": "/var/lib/lab/package-registry.json"}}
	node := workstation()
	node.At = "workstation.internal"
	world := mcat.World{Offered: map[string][]mcat.Provider{"npm-package-registry": {{Node: "home", At: "home.internal",
		Module: "forge", Serves: map[string]any{"port": 3000},
		LeftOut: []string{`forge serves npm-package-registry without "public-root"`}}}}}
	got, err := Resolve(shelf(aForgeManifest(t), consumer), []string{"lab"}, node, world)
	if err != nil {
		t.Fatal(err)
	}
	for _, n := range got.Needs {
		if n.Name == "npm-package-registry" {
			if len(n.LeftOut) != 1 {
				t.Fatalf("the need carries what was left out: %+v", n)
			}
			return
		}
	}
	t.Fatalf("no need: %+v", got.Needs)
}

// The provider's contributions file carries no own name on a consumer's entry (ADR 0346 §4): only what
// is derived for that consumer is there (ADR 0202 §5), and the provider reads its own names in its files.
func TestAProvidersOwnNameIsNotOnItsConsumersEntry(t *testing.T) {
	m := aForgeManifest(t)
	r := mcat.Resolution{Node: "home", PublicDomain: "example.org", Modules: []mcat.Manifest{m}}
	derived, err := resolutionDerivedFor(r, "npm-package-registry", "lab_home", "lab", "", nil)
	if err != nil {
		t.Fatal(err)
	}
	if derived != nil {
		t.Fatalf("a consumer's entry carries only what was derived for it: %v", derived)
	}
}