package store

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

// A reference clients are told to use must not be able to change underneath
// them.
//
// 012 turned three descriptive columns into IDENTIFIERS other people store: in
// agent.json on a shop counter, in a saved URL, in a scheduled report. All
// three were already treated as stable and none of it was enforced - the
// camera case was half-enforced in one handler and nowhere else, which is the
// shape of a rule that holds until somebody adds a second write path.
//
// Only a real database can test this: the rule is a trigger, and an in-memory
// fake would happily agree with any implementation.
func TestLiveAReferenceCannotBeRenamed(t *testing.T) {
	st := liveStore(t)
	ctx := context.Background()
	site := seedAgentSite(t, st, "frozen-"+stamp())

	if _, err := st.pool.Exec(ctx, `
		INSERT INTO site_cameras (client_id, site_id, camera_id, label, host)
		VALUES ($1::uuid, $2::uuid, 'Office1', 'Front door', '10.0.0.5')`,
		site.ClientID, site.SiteID); err != nil {
		t.Fatal(err)
	}

	for _, c := range []struct{ what, sql string }{
		{"a shop's slug", `UPDATE sites SET slug = 'moved' WHERE id = $1::uuid`},
		{"a camera's id", `UPDATE site_cameras SET camera_id = 'Office2' WHERE site_id = $1::uuid`},
	} {
		_, err := st.pool.Exec(ctx, c.sql, site.SiteID)
		if err == nil {
			t.Fatalf("%s was renamed - it is a reference other systems store", c.what)
		}
		if !strings.Contains(err.Error(), "cannot be changed") {
			t.Fatalf("%s: unexpected error %v", c.what, err)
		}
	}

	// The DISPLAY name is not frozen and must not be. It is what a person
	// reads, nothing keys on it, and a system that cannot fix a typo in a
	// shop's name has confused the two.
	if _, err := st.pool.Exec(ctx,
		`UPDATE sites SET name = 'Renamed Shop' WHERE id = $1::uuid`, site.SiteID); err != nil {
		t.Fatalf("a shop's display name must stay editable: %v", err)
	}
	if _, err := st.pool.Exec(ctx,
		`UPDATE site_cameras SET label = 'Back door' WHERE site_id = $1::uuid`,
		site.SiteID); err != nil {
		t.Fatalf("a camera's label must stay editable: %v", err)
	}
}