package bootstrap

import (
	"encoding/json"
	"strings"
	"testing"
)

// Defends novox/hq ADR 0100: a port given for the package registry at genesis reaches the one
// thing that dials it by a fixed number, the builder's package binding.

// The builder's package binding exactly as the catalogue's manifest carries it.
const builderManifest = `{
  "module": "builder",
  "resources": [
    {
      "id": "package-binding",
      "type": "file",
      "path": "/var/lib/mesh/builder/package-registry.json",
      "mode": "0600",
      "content": "{\"provision\": \"package-registry\", \"from\": \"gitea\", \"at\": \"127.0.0.1\", \"as\": \"mesh-builder\", \"serves\": {\"scheme\": \"http\", \"port\": 3000, \"npm-path\": \"/api/packages/novox/npm/\"}}\n"
    }
  ]
}`

func bindingPort(t *testing.T, manifest []byte) float64 {
	t.Helper()
	var m struct {
		Resources []struct {
			Content string `json:"content"`
		} `json:"resources"`
	}
	if err := json.Unmarshal(manifest, &m); err != nil {
		t.Fatal(err)
	}
	var binding struct {
		Serves struct {
			Port float64 `json:"port"`
		} `json:"serves"`
	}
	if err := json.Unmarshal([]byte(m.Resources[0].Content), &binding); err != nil {
		t.Fatal(err)
	}
	return binding.Serves.Port
}

func TestTheBuilderFollowsThePackageRegistrysGivenPort(t *testing.T) {
	got, err := followPackagesPort([]byte(builderManifest), 3100)
	if err != nil {
		t.Fatal(err)
	}
	if p := bindingPort(t, got); p != 3100 {
		t.Errorf("the builder's binding dials %v, not the port given", p)
	}
}

func TestTheBuilderOnTheDefaultPortIsUnchanged(t *testing.T) {
	got, err := followPackagesPort([]byte(builderManifest), 3000)
	if err != nil || string(got) != builderManifest {
		t.Errorf("the default port changed the manifest: %v", err)
	}
}

func TestABuilderManifestThatNoLongerNamesThePortIsRefused(t *testing.T) {
	moved := strings.Replace(builderManifest, `\"port\": 3000`, `\"port\": 3001`, 1)
	if _, err := followPackagesPort([]byte(moved), 3100); err == nil || !strings.Contains(err.Error(), "--packages-port") {
		t.Errorf("a manifest the port cannot reach was accepted: %v", err)
	}
}