package main

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/novox/mesh-controller/internal/builder"
)

// The build agent's package registry (novox/hq ADR 0336, issue 121): its npm-package-registry
// requirement is optional, so the binding may be absent, and on genesis's node the installer seals
// the forge it raised as one genesis document instead.

// registryFiles names the three paths the build agent's environment always names, writing only those
// given.
func registryFiles(t *testing.T, binding, token, genesis string) {
	t.Helper()
	dir := t.TempDir()
	for env, content := range map[string]string{
		"MESH_PACKAGE_BINDING":          binding,
		"MESH_NPM_TOKEN_FILE":           token,
		"MESH_GENESIS_PACKAGE_REGISTRY": genesis,
	} {
		path := filepath.Join(dir, env)
		t.Setenv(env, path)
		if content != "" {
			if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
				t.Fatal(err)
			}
		}
	}
	for _, env := range []string{"MESH_NPM_REGISTRY", "MESH_NPM_TOKEN", "MESH_NPM_USER", "MESH_NPM_SCOPE"} {
		t.Setenv(env, "")
	}
}

const (
	aBinding = `{"from":"gitea","at":"anchor.mesh","as":"anchor-agent",
	  "serves":{"scheme":"http","port":3000,"npm-path":"/api/packages/novox/npm/"}}`
	aGenesisDocument = `{"scheme":"http","at":"127.0.0.1","port":3100,"npm-path":"/api/packages/novox/npm/",
	  "as":"mesh-builder","password":"genesis-secret"}`
)

func TestUntilTheRequirementBindsTheGenesisDocumentIsRead(t *testing.T) {
	registryFiles(t, "", "", aGenesisDocument)
	n, err := packagesFrom("anchor")
	if err != nil {
		t.Fatalf("an absent binding beside a genesis document was refused: %v", err)
	}
	if n.From != builder.FromGenesis || n.Registry != "http://127.0.0.1:3100/api/packages/novox/npm/" ||
		n.Username != "mesh-builder" || n.Password != "genesis-secret" || n.Scope != "@novox" {
		t.Fatalf("the genesis document was not what the registry came from: %+v", n)
	}
	file, err := n.File()
	if err != nil || !strings.Contains(file, "//127.0.0.1:3100/api/packages/novox/npm/:username=mesh-builder") {
		t.Fatalf("the .npmrc is not written from the genesis document: %v\n%s", err, file)
	}
	if got := saysRegistry(n); !strings.Contains(got, "genesis document") {
		t.Errorf("the log does not say the genesis document: %s", got)
	}
}

func TestARealBindingWinsOverTheGenesisDocument(t *testing.T) {
	registryFiles(t, aBinding, "bound-secret\n", aGenesisDocument)
	n, err := packagesFrom("anchor")
	if err != nil {
		t.Fatal(err)
	}
	if n.From != builder.FromBinding || n.Registry != "http://anchor.mesh:3000/api/packages/novox/npm/" ||
		n.Username != "anchor-agent" || n.Password != "bound-secret" {
		t.Fatalf("the binding did not win over the genesis document: %+v", n)
	}
	if got := saysRegistry(n); !strings.Contains(got, "binding") {
		t.Errorf("the log does not say the binding: %s", got)
	}
}

func TestWithNeitherTheAgentHasNoRegistryAndSaysWhere(t *testing.T) {
	registryFiles(t, "", "", "")
	n, err := packagesFrom("workstation")
	if err != nil {
		t.Fatalf("an unbound optional requirement was a fault: %v", err)
	}
	if n.Enabled() || n.Machine != "workstation" {
		t.Fatalf("a registry came from nowhere: %+v", n)
	}
	got := saysRegistry(n)
	for _, want := range []string{"npm-package-registry", "unbound", "workstation"} {
		if !strings.Contains(got, want) {
			t.Errorf("the log does not say %q: %s", want, got)
		}
	}
}

func TestAGenesisDocumentMissingAFieldIsRefusedByName(t *testing.T) {
	registryFiles(t, "", "", `{"at":"127.0.0.1","port":3000,"npm-path":"/api/packages/novox/npm/","as":"mesh-builder"}`)
	if _, err := packagesFrom("anchor"); err == nil || !strings.Contains(err.Error(), "password") {
		t.Fatalf("a genesis document with no password was taken: %v", err)
	}
}