package catalogue

// A directory the mesh places (novox/hq ADR 0112). These tests pin the contract: a pathless
// directory resolves under the node's root, ${dir:…} names it from every field a host path can
// live in, a stated path is the adopted-data placement and wins, an unknown reference refuses at
// the manifest, and filling for one node never leaks into the next composition.

import (
	"strings"
	"testing"
)

func placedModule() Manifest {
	return Manifest{
		Module: "photos",
		Resources: []map[string]any{
			{"id": "data", "type": "directory", "mode": "0700"},
			{"id": "server-env", "type": "file", "path": "${dir:data}/server.env",
				"content": "STORE=${dir:data}/objects\n"},
			{"id": "server", "type": "container", "name": "photos-server",
				"volumes":  []any{"${dir:data}:/data"},
				"env":      map[string]any{"DATA": "${dir:data}/objects"},
				"env-file": []any{"${dir:data}/server.env"}},
		},
	}
}

func TestAPathlessDirectoryResolvesUnderTheNodesRoot(t *testing.T) {
	m := placedModule()
	dirs := dirsFor(m, Rendering{})
	if dirs["data"] != "/var/lib/photos/data" {
		t.Fatalf("the default root is /var/lib and the shape is <root>/<module>/<id>; got %q", dirs["data"])
	}
	dirs = dirsFor(m, Rendering{DataRoot: "/tank/nox/"})
	if dirs["data"] != "/tank/nox/photos/data" {
		t.Fatalf("a node's own root is honoured, trailing slash and all; got %q", dirs["data"])
	}
}

func TestDirReferencesBecomeThePlaceInEveryField(t *testing.T) {
	m := placedModule()
	dirs := dirsFor(m, Rendering{})

	directory := shallowCopy(m.Resources[0])
	if err := dirInto(directory, dirs, m.Module); err != nil {
		t.Fatal(err)
	}
	if directory["path"] != "/var/lib/photos/data" {
		t.Fatalf("a pathless directory receives its resolved path; got %v", directory["path"])
	}

	file := shallowCopy(m.Resources[1])
	if err := dirInto(file, dirs, m.Module); err != nil {
		t.Fatal(err)
	}
	if file["path"] != "/var/lib/photos/data/server.env" {
		t.Fatalf("a file's path names the place; got %v", file["path"])
	}
	if file["content"] != "STORE=/var/lib/photos/data/objects\n" {
		t.Fatalf("a file's content names the place; got %v", file["content"])
	}

	container := shallowCopy(m.Resources[2])
	if err := dirInto(container, dirs, m.Module); err != nil {
		t.Fatal(err)
	}
	if container["volumes"].([]any)[0] != "/var/lib/photos/data:/data" {
		t.Fatalf("a mount names the place; got %v", container["volumes"])
	}
	if container["env"].(map[string]any)["DATA"] != "/var/lib/photos/data/objects" {
		t.Fatalf("an environment value names the place; got %v", container["env"])
	}
	if container["env-file"].([]any)[0] != "/var/lib/photos/data/server.env" {
		t.Fatalf("an env-file names the place; got %v", container["env-file"])
	}
}

func TestAStatedPathIsThePlacementAndStillAnswersByName(t *testing.T) {
	m := placedModule()
	// The adopted-machine case: data that must sit where the predecessor already put it.
	m.Resources[0]["path"] = "/services/mssql/data/"
	dirs := dirsFor(m, Rendering{})
	if dirs["data"] != "/services/mssql/data" {
		t.Fatalf("a stated path wins over the root, trimmed; got %q", dirs["data"])
	}
	container := shallowCopy(m.Resources[2])
	if err := dirInto(container, dirs, m.Module); err != nil {
		t.Fatal(err)
	}
	if container["volumes"].([]any)[0] != "/services/mssql/data:/data" {
		t.Fatalf("references follow the placement; got %v", container["volumes"])
	}
}

func TestFillingForOneNodeLeaksIntoNoOther(t *testing.T) {
	m := placedModule()
	first := shallowCopy(m.Resources[2])
	if err := dirInto(first, dirsFor(m, Rendering{DataRoot: "/first"}), m.Module); err != nil {
		t.Fatal(err)
	}
	second := shallowCopy(m.Resources[2])
	if err := dirInto(second, dirsFor(m, Rendering{DataRoot: "/second"}), m.Module); err != nil {
		t.Fatal(err)
	}
	if got := second["volumes"].([]any)[0]; got != "/second/photos/data:/data" {
		t.Fatalf("the second composition must see the manifest, not the first fill; got %v", got)
	}
	if m.Resources[2]["volumes"].([]any)[0] != "${dir:data}:/data" {
		t.Fatalf("the manifest itself stays a template; got %v", m.Resources[2]["volumes"])
	}
}

func TestAReferenceToNoDirectoryRefusesAtTheManifest(t *testing.T) {
	m := placedModule()
	m.Resources[2]["volumes"] = []any{"${dir:date}:/data"} // a typo, the likely shape
	problems := m.unknownDirRefs()
	if len(problems) != 1 || !strings.Contains(problems[0], `${dir:date}`) {
		t.Fatalf("a reference naming no directory is a manifest problem; got %v", problems)
	}
	if got := placedModule().unknownDirRefs(); len(got) != 0 {
		t.Fatalf("a correct definition has none; got %v", got)
	}
}

func TestAReferenceToNoDirectoryRefusesAtCompositionToo(t *testing.T) {
	m := placedModule()
	container := shallowCopy(m.Resources[2])
	container["env"] = map[string]any{"DATA": "${dir:date}"}
	err := dirInto(container, dirsFor(m, Rendering{}), m.Module)
	if err == nil || !strings.Contains(err.Error(), `"date"`) || !strings.Contains(err.Error(), `"data"`) {
		t.Fatalf("the refusal names the mistake and what exists; got %v", err)
	}
}

func shallowCopy(resource map[string]any) map[string]any {
	copied := map[string]any{}
	for k, v := range resource {
		copied[k] = v
	}
	return copied
}