package catalogue

import (
	"strings"
	"testing"
)

// **A process's environment is composed as a container's is** (novox/hq to-be 38 WP4c).
//
// A module's code moving out of its container becomes a process on the machine, and what its
// container's environment asked for — the port this machine gave the module, the place it put the
// module's directory — it still has to be told. Filled for a container and not for a process, the
// literal `${port:8080}` reached the process as its environment and was read as a port; the modules
// that moved first wrote their run-once steps an env file instead.
func processModule(env map[string]any) Manifest {
	return Manifest{
		Module:  "showcase",
		Listens: []Listening{{Port: 8080, From: FromMesh}},
		Resources: []map[string]any{
			{"id": "data", "type": "directory", "mode": "0700"},
			{"id": "setup", "type": "process", "name": "showcase-setup", "run-once": true,
				"run": []any{"/usr/bin/showcase", "setup"}, "env": env},
		},
	}
}

func TestAProcessIsToldItsPortAndItsPlaceInItsEnvironment(t *testing.T) {
	env := map[string]any{
		"SHOWCASE_URL":  "http://127.0.0.1:${port:8080}",
		"SHOWCASE_DATA": "${dir:data}/objects",
		"SHOWCASE_DB":   "127.0.0.1:${seat:mesh-store:5432}",
		"GREETING":      "hello",
	}
	out, err := Resolution{Node: "anchor", Modules: []Manifest{processModule(env)}}.Declaration(Rendering{
		Ports: map[string]map[int]int{"showcase": {8080: 21000}},
		Seats: map[string]map[int]int{"mesh-store": {5432: 6852}},
	})
	if err != nil {
		t.Fatalf("a process asking for its port and its place does not compose: %v", err)
	}
	setup := fileNamed(out, "showcase.setup")
	if setup == nil {
		t.Fatalf("the process is not in the declaration: %v", out)
	}
	got, _ := setup["env"].(map[string]any)
	for key, want := range map[string]string{
		"SHOWCASE_URL":  "http://127.0.0.1:21000",
		"SHOWCASE_DATA": "/var/lib/showcase/data/objects",
		"SHOWCASE_DB":   "127.0.0.1:6852",
		"GREETING":      "hello",
	} {
		if got[key] != want {
			t.Errorf("the process is told %s=%v, want %q", key, got[key], want)
		}
	}
	if env["SHOWCASE_URL"] != "http://127.0.0.1:${port:8080}" {
		t.Fatalf("composing for one machine edited the module's own manifest: %v", env)
	}
}

// An unknown reference in a process's environment is refused as a container's is, naming the
// process and the variable — left alone, it would reach the machine as a literal.
func TestAProcessAskingAboutAnUndeclaredPortIsRefused(t *testing.T) {
	env := map[string]any{"SHOWCASE_URL": "http://127.0.0.1:${port:9999}"}
	_, err := Resolution{Node: "anchor", Modules: []Manifest{processModule(env)}}.Declaration(Rendering{})
	if err == nil {
		t.Fatal("a process was told a port its module never said it listens on")
	}
	for _, said := range []string{"showcase-setup", "SHOWCASE_URL", "${port:9999}", "8080"} {
		if !strings.Contains(err.Error(), said) {
			t.Errorf("the refusal does not say %q: %v", said, err)
		}
	}

	env = map[string]any{"SHOWCASE_DATA": "${dir:date}/objects"}
	if _, err := (Resolution{Node: "anchor", Modules: []Manifest{processModule(env)}}).Declaration(Rendering{}); err == nil ||
		!strings.Contains(err.Error(), "${dir:date}") {
		t.Fatalf("a process naming no directory of its module was not refused: %v", err)
	}
}