package bridge

import "testing"

// TestPruneControllers_RemovesAbsentDevice 米家已删除设备的控制器必须被剔除，
// 否则 AC()/Switch() 等访问器仍会为已删设备返回控制器。
func TestPruneControllers_RemovesAbsentDevice(t *testing.T) {
	dv := map[string]interface{}{
		"did-keep": struct{}{},
		"did-gone": struct{}{},
	}

	removed := pruneControllers(dv, map[string]struct{}{"did-keep": {}})

	if len(removed) != 1 || removed[0] != "did-gone" {
		t.Fatalf("removed = %v, want [did-gone]", removed)
	}
	if _, ok := dv["did-gone"]; ok {
		t.Error("已删设备应被剔除")
	}
	if _, ok := dv["did-keep"]; !ok {
		t.Error("云端仍存在的设备不应被剔除")
	}
}

// TestPruneControllers_NoChange 全部设备仍存在时不做任何改动。
func TestPruneControllers_NoChange(t *testing.T) {
	dv := map[string]interface{}{"did1": struct{}{}, "did2": struct{}{}}

	removed := pruneControllers(dv, map[string]struct{}{"did1": {}, "did2": {}, "did3": {}})

	if len(removed) != 0 {
		t.Errorf("removed = %v, want empty", removed)
	}
	if len(dv) != 2 {
		t.Errorf("dv len = %d, want 2", len(dv))
	}
}

// TestPruneControllers_EmptyAlive RemovedAll：设备列表为空时全部剔除（调用方保证非空列表）。
func TestPruneControllers_EmptyAlive(t *testing.T) {
	dv := map[string]interface{}{"did1": struct{}{}, "did2": struct{}{}}

	removed := pruneControllers(dv, nil)

	if len(removed) != 2 {
		t.Fatalf("removed = %v, want 2 entries", removed)
	}
	if len(dv) != 0 {
		t.Errorf("dv len = %d, want 0", len(dv))
	}
}