package builder

import (
	"context"
	"strings"
	"testing"
)

// A module's own packages (dependencies.go): installed into its own directory, in the toolchain,
// before the compile, so the bundler inlines them — the SDK always the toolchain's.

func buildWithPackageJSON(t *testing.T, pkg string, extra map[string]string, registry Npmrc) (*recorded, error) {
	t.Helper()
	files := map[string]string{"index.ts": "console.log(1)"}
	if pkg != "" {
		files["package.json"] = pkg
	}
	for k, v := range extra {
		files[k] = v
	}
	r, workspace := aRepository(t, aBundle, files)
	held := map[string]string{"mesh-tools/build": "registry.invalid/mesh-tools/build@sha256:" + strings.Repeat("b", 64)}
	_, err := Build(context.Background(), compiling{r}.run, r,
		"https://forge.invalid/greeter.git", "", "", workspace, held, registry, GitCredential{}, nil)
	return r, err
}

func installs(r *recorded) []string {
	var out []string
	for _, line := range r.ran {
		if strings.HasPrefix(line, "docker run") && strings.Contains(line, "npm ci") {
			out = append(out, line)
		}
	}
	return out
}

func compileIndex(r *recorded) int {
	for i, line := range r.ran {
		if strings.Contains(line, "--outDir") {
			return i
		}
	}
	return -1
}

func TestAModulesOwnPackagesAreInstalledInTheToolchainBeforeTheCompile(t *testing.T) {
	r, err := buildWithPackageJSON(t, `{"type":"module","dependencies":{"@novox/mesh-sdk":"^0.1.0","pg":"^8"},"devDependencies":{"typescript":"^5"}}`,
		nil, Npmrc{Scope: "@novox", Registry: "https://forge.invalid/api/packages/novox/npm"})
	if err != nil {
		t.Fatal(err)
	}
	got := installs(r)
	if len(got) != 1 {
		t.Fatalf("want one install of the module's own packages:\n%s", strings.Join(r.ran, "\n"))
	}
	line := got[0]
	for _, want := range []string{
		"mesh-tools/build@sha256:",       // in the toolchain image
		":/app/modules/module",           // into the module's own directory
		"--workdir /app/modules/module",  //
		npmCache + ":/root/.npm",         // npm's verified download cache, and only that
		"--omit=dev", "--ignore-scripts", // production packages, no build-node scripts
		"npm ci", "npm install", "--no-package-lock", // the lockfile when there is one, else the ranges
		"--@novox:registry=https://forge.invalid/api/packages/novox/npm/", // the scope from the mesh's registry
		"--network host",
		"@novox/mesh-sdk", // named, to be taken out of what is installed
	} {
		if !strings.Contains(line, want) {
			t.Errorf("the install lacks %q:\n%s", want, line)
		}
	}
	// The SDK is the toolchain's: never installed from the module's range, and any copy removed.
	if !strings.Contains(line, `delete p[k][sdk]`) || !strings.Contains(line, `-path "*/node_modules/@novox/mesh-sdk" -exec rm -rf`) {
		t.Errorf("the module's own SDK range could shadow the toolchain's SDK:\n%s", line)
	}
	if i, c := strings.Index(strings.Join(r.ran, "\n"), "npm ci"), compileIndex(r); c < 0 ||
		i > strings.Index(strings.Join(r.ran, "\n"), "--outDir") {
		t.Fatalf("the install did not run before the compile:\n%s", strings.Join(r.ran, "\n"))
	}
}

// **A module with nothing beyond the SDK builds exactly as before**: the same commands, no install.
func TestAModuleDependingOnlyOnTheSDKBuildsExactlyAsBefore(t *testing.T) {
	without, err := buildWithPackageJSON(t, "", nil, Npmrc{})
	if err != nil {
		t.Fatal(err)
	}
	for _, pkg := range []string{
		`{"type":"module","dependencies":{"@novox/mesh-sdk":"^0.1.0"},"devDependencies":{"typescript":"^5"}}`,
		`{"type":"module"}`,
	} {
		with, err := buildWithPackageJSON(t, pkg, map[string]string{"package-lock.json": "{}"}, Npmrc{Scope: "@novox", Registry: "https://forge.invalid/npm/"})
		if err != nil {
			t.Fatal(err)
		}
		if strings.Contains(strings.Join(with.ran, "\n"), "npm ") {
			t.Fatalf("a module depending on nothing but the SDK ran npm:\n%s", strings.Join(with.ran, "\n"))
		}
		if len(with.ran) != len(without.ran) {
			t.Fatalf("a module depending only on the SDK built differently from one with no package.json:\n%s\n---\n%s",
				strings.Join(with.ran, "\n"), strings.Join(without.ran, "\n"))
		}
	}
}

// Without the mesh's registry a scoped package would resolve on the public one: refused by name.
func TestAScopedPackageWithNoRegistryIsRefused(t *testing.T) {
	r, err := buildWithPackageJSON(t, `{"dependencies":{"@novox/mesh-sdk":"^0.1.0","@novox/other":"^1"}}`, nil, Npmrc{})
	if err == nil || !strings.Contains(err.Error(), "@novox/other") {
		t.Fatalf("a scoped package was installed with no registry for its scope: %v", err)
	}
	if strings.Contains(strings.Join(r.ran, "\n"), "--outDir") {
		t.Fatal("the compile ran after the refusal")
	}
	// A public package installs without one, from the public registry and nothing else.
	r, err = buildWithPackageJSON(t, `{"dependencies":{"mssql":"^11"}}`, nil, Npmrc{})
	if err != nil {
		t.Fatal(err)
	}
	if got := installs(r); len(got) != 1 || strings.Contains(got[0], ":registry=") || strings.Contains(got[0], "--network host") {
		t.Fatalf("a public package's install: %v", got)
	}
}

func TestAnUnreadablePackageJSONIsRefusedByName(t *testing.T) {
	_, err := buildWithPackageJSON(t, `{"dependencies":`, nil, Npmrc{})
	if err == nil || !strings.Contains(err.Error(), "package.json") {
		t.Fatalf("a broken package.json was not refused by name: %v", err)
	}
}