package lua

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

// TestAccessOverrideSurvivesReload is the test that matters for an access
// restriction. An in-memory map makes "billing is admin-only" look like it
// worked right up to the next restart, and then the restriction is simply gone
// with nothing in the logs to explain it. Both the plugin-level audience and
// the per-endpoint spec must come back.
func TestAccessOverrideSurvivesReload(t *testing.T) {
	dir := t.TempDir()
	src := `local P = {}
P.name = "api"
P.version = "1.0.0"
P.http = {
  { path = "health", handler = "health", roles = { "admin" } },
}
function P.health(req) return { json = { ok = true } } end
return P
`
	first := NewPlugins(NewVM(dir), dir)
	if err := first.LoadSource("api", src); err != nil {
		t.Fatal(err)
	}
	first.SetPluginVisibility("api", "admin, user")
	if err := first.SetEndpointAccess("api", "health", "@homeagent"); err != nil {
		t.Fatal(err)
	}
	if _, err := os.Stat(filepath.Join(dir, accessFileName)); err != nil {
		t.Fatalf("override was not written: %v", err)
	}

	// A fresh Plugins over the same dir is what a restart looks like.
	second := NewPlugins(NewVM(dir), dir)
	// The plugin source is on disk too, so this second instance sees both the
	// plugin and the overrides — the same pair a restart sees. Loading only the
	// overrides would leave no endpoints to walk, and the assertion below would
	// pass vacuously.
	if err := second.LoadSource("api", src); err != nil {
		t.Fatal(err)
	}
	if err := second.LoadAccessOverrides(); err != nil {
		t.Fatalf("reload overrides: %v", err)
	}
	if got := second.VisibilityOverride("api"); got != "admin, user" {
		t.Errorf("plugin visibility lost across reload: %q", got)
	}
	found := false
	for _, e := range second.EndpointAccess() {
		if e.Path == "health" && len(e.OverrideKeys) == 1 && e.OverrideKeys[0] == "homeagent" {
			found = true
		}
	}
	if !found {
		t.Error("endpoint override lost across reload")
	}
}

// TestAccessOverrideClearedRemovesFile keeps the "nothing overridden" state
// distinguishable from "overridden with something".
func TestAccessOverrideClearedRemovesFile(t *testing.T) {
	dir := t.TempDir()
	ps := NewPlugins(NewVM(dir), dir)
	ps.SetPluginVisibility("api", "admin")
	path := filepath.Join(dir, accessFileName)
	if _, err := os.Stat(path); err != nil {
		t.Fatalf("expected an access file: %v", err)
	}
	ps.SetPluginVisibility("api", "")
	if _, err := os.Stat(path); !os.IsNotExist(err) {
		t.Errorf("clearing the last override should remove the file, got %v", err)
	}
}

// TestVisibilityOverridesExcludeEndpointKeys keeps endpoint policy out of the
// plugin-audience listing. Both live in one map, and reporting "probe#hello"
// under visibility is how the plugin page ends up offering to save an audience
// of that name — which nothing reads as an audience.
func TestVisibilityOverridesExcludeEndpointKeys(t *testing.T) {
	dir := t.TempDir()
	src := `local P = {}
P.name = "api"
P.version = "1.0.0"
P.http = { { path = "health", handler = "health", roles = { "admin" } } }
function P.health(req) return { json = { ok = true } } end
return P
`
	ps := NewPlugins(NewVM(dir), dir)
	if err := ps.LoadSource("api", src); err != nil {
		t.Fatal(err)
	}
	ps.SetPluginVisibility("api", "admin, user")
	if err := ps.SetEndpointAccess("api", "health", "@homeagent"); err != nil {
		t.Fatal(err)
	}
	got := ps.VisibilityOverrides()
	if got["api"] != "admin, user" {
		t.Errorf("plugin audience missing: %+v", got)
	}
	if _, leaked := got["api#health"]; leaked {
		t.Errorf("endpoint override leaked into the audience map: %+v", got)
	}
	if len(got) != 1 {
		t.Errorf("expected exactly the plugin audience, got %+v", got)
	}
}