package catalogue

import (
	"strings"
	"testing"
)

// An operator's value reaches a file from the assignment's settings, the node's layer over the
// mesh's (novox/hq ADR 0112, ADR 0155), and a value nothing set is refused by name.
func TestASettingReachesAFileFromTheLayers(t *testing.T) {
	file := map[string]any{"id": "env", "type": "file", "path": "/x/mail.env",
		"content": "DOMAIN=${setting:domain}\nSITENAME=${setting:sitename}\nWORKERS=${setting:workers}\n"}
	layers := []Layer{
		{From: "the mesh", Values: map[string]any{"domain": "example.tld", "sitename": "Mesh", "workers": float64(4)}},
		{From: "this node", Values: map[string]any{"sitename": "This one"}},
	}
	if err := settingInto(file, layers, "mail"); err != nil {
		t.Fatal(err)
	}
	if file["content"] != "DOMAIN=example.tld\nSITENAME=This one\nWORKERS=4\n" {
		t.Fatalf("filled as %q", file["content"])
	}
}

func TestASettingNothingSetIsRefusedByName(t *testing.T) {
	file := map[string]any{"id": "env", "type": "file", "content": "DOMAIN=${setting:domain}\n"}
	err := settingInto(file, []Layer{{From: "the mesh", Values: map[string]any{"other": "x"}}}, "mail")
	if err == nil {
		t.Fatal("a setting nothing set was written as something")
	}
	for _, want := range []string{"${setting:domain}", "settings set mail", "set today: other"} {
		if !strings.Contains(err.Error(), want) {
			t.Fatalf("the refusal lacks %q: %v", want, err)
		}
	}
	// Left as it was: the literal placeholder must never reach a machine.
	if file["content"] != "DOMAIN=${setting:domain}\n" {
		t.Fatalf("content was changed on refusal: %q", file["content"])
	}
}

// A key a file asks for is a destination, so setting it is not called stray.
func TestASettingAFileAsksForIsNotStray(t *testing.T) {
	m := Manifest{Module: "mail", Resources: []map[string]any{
		{"id": "env", "type": "file", "content": "DOMAIN=${setting:domain}\n"},
	}}
	layers := []Layer{{From: "the mesh", Values: map[string]any{"domain": "example.tld", "stray": "x"}}}
	unused := strings.Join(UnusedSettings(m, layers), "; ")
	if strings.Contains(unused, `"domain"`) {
		t.Fatalf("a key a file asks for was called stray: %s", unused)
	}
	if !strings.Contains(unused, `"stray"`) {
		t.Fatalf("a key nothing reads was not named: %s", unused)
	}
}