using NightclubArcadia.Cinematics;
using NightclubArcadia.Dialogue;
using NightclubArcadia.Skills;
using NightclubArcadia.UI.Dialogue;
using NightclubArcadia.UI.HUD;
using NightclubArcadia.UI.Menu;
using StarterAssets;
using TMPro;
using Unity.Cinemachine;
using UnityEngine;
using UnityEngine.UI;
using Yarn.Unity;

namespace NightclubArcadia.UI
{
    /// <summary>
    /// Builds the rudimentary UI layer at runtime, for scenes where the UI
    /// prefabs have not been instantiated. It is a fallback only: the authored
    /// path is Tools → Nightclub Arcadia → Set Up UI Layer, which produces the
    /// prefabs under Assets/Prefabs/UI and wires them into the scene.
    ///
    /// It does NOT auto-spawn. It used to, which meant that once the scene had
    /// been wired properly it would still create a second "UI System" object
    /// carrying a duplicate UIStateController — logging a Debug.LogError every
    /// play — and would reflection-overwrite DialogueCameraFraming's serialised
    /// dialogueScreenX, making that value impossible to tune in the Inspector.
    /// Add this component to a scene by hand if you want the fallback.
    /// </summary>
    [DefaultExecutionOrder(-100)]
    public sealed class UILayerBootstrap : MonoBehaviour
    {
        [SerializeField] bool buildIfMissing = true;

        void Awake()
        {
            EnsureFoundation();

            if (!buildIfMissing)
            {
                return;
            }

            if (FindFirstObjectByType<DialogueStreamPresenter>() == null)
            {
                BuildDialogueStream();
            }

            if (FindFirstObjectByType<PortraitHudView>() == null)
            {
                BuildHud();
            }

            if (FindFirstObjectByType<PlayerMenuController>() == null)
            {
                BuildMenu();
            }

            EnsureCameraFraming();
            WireDialogueRunner();
            HidePackageDialogueCanvas();
        }

        void EnsureFoundation()
        {
            if (UIStateController.Instance == null && FindFirstObjectByType<UIStateController>() == null)
            {
                var go = GameObject.Find("UI System") ?? new GameObject("UI System");
                go.AddComponent<UIStateController>();
            }

            var player = GameObject.Find("PlayerArmature");
            if (player == null)
            {
                return;
            }

            if (player.GetComponent<PlayerControlLock>() == null)
            {
                player.AddComponent<PlayerControlLock>();
            }

            if (player.GetComponent<PlayerMenuInput>() == null)
            {
                player.AddComponent<PlayerMenuInput>();
            }

            var inputs = player.GetComponent<StarterAssetsInputs>();
            if (inputs != null)
            {
                inputs.cursorLocked = false;
                Cursor.lockState = CursorLockMode.None;
                Cursor.visible = true;
            }

            var transition = FindFirstObjectByType<DialogueTransitionController>();
            if (transition != null)
            {
                var soLock = player.GetComponent<PlayerControlLock>();
                // Assign via reflection-free serialized path: public setter not available,
                // so use SendMessage-style field via SerializedObject is editor-only.
                // Runtime: DialogueTransitionController finds lock from playerArmature in Awake.
                var field = typeof(DialogueTransitionController).GetField(
                    "controlLock",
                    System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
                field?.SetValue(transition, soLock);
            }
        }

        void BuildDialogueStream()
        {
            var canvasGo = CreateCanvas("DialogueStreamCanvas", 5);
            var canvasGroup = canvasGo.AddComponent<CanvasGroup>();
            canvasGroup.alpha = 0f;
            canvasGroup.interactable = false;
            canvasGroup.blocksRaycasts = false;

            var panel = new GameObject("Panel", typeof(RectTransform), typeof(Image));
            panel.transform.SetParent(canvasGo.transform, false);
            var panelRt = panel.GetComponent<RectTransform>();
            panelRt.anchorMin = new Vector2(0.66f, 0f);
            panelRt.anchorMax = Vector2.one;
            panelRt.offsetMin = Vector2.zero;
            panelRt.offsetMax = Vector2.zero;
            panel.GetComponent<Image>().color = new Color(0.05f, 0.05f, 0.08f, 0.92f);

            var scrollGo = new GameObject("Scroll", typeof(RectTransform), typeof(ScrollRect), typeof(Image));
            scrollGo.transform.SetParent(panel.transform, false);
            Stretch(scrollGo.GetComponent<RectTransform>(), 8f);
            scrollGo.GetComponent<Image>().color = new Color(0f, 0f, 0f, 0.01f);

            var viewport = new GameObject("Viewport", typeof(RectTransform), typeof(RectMask2D), typeof(Image));
            viewport.transform.SetParent(scrollGo.transform, false);
            Stretch(viewport.GetComponent<RectTransform>());
            viewport.GetComponent<Image>().color = new Color(1f, 1f, 1f, 0.01f);

            var content = new GameObject("Content", typeof(RectTransform), typeof(VerticalLayoutGroup), typeof(ContentSizeFitter));
            content.transform.SetParent(viewport.transform, false);
            var contentRt = content.GetComponent<RectTransform>();
            contentRt.anchorMin = new Vector2(0f, 0f);
            contentRt.anchorMax = new Vector2(1f, 0f);
            contentRt.pivot = new Vector2(0.5f, 0f);
            var vlg = content.GetComponent<VerticalLayoutGroup>();
            vlg.childAlignment = TextAnchor.LowerCenter;
            vlg.childControlHeight = true;
            vlg.childControlWidth = true;
            vlg.childForceExpandHeight = false;
            vlg.childForceExpandWidth = true;
            vlg.spacing = 6f;
            content.GetComponent<ContentSizeFitter>().verticalFit = ContentSizeFitter.FitMode.PreferredSize;

            var messages = new GameObject("Messages", typeof(RectTransform), typeof(VerticalLayoutGroup), typeof(ContentSizeFitter));
            messages.transform.SetParent(content.transform, false);
            ConfigureVertical(messages);

            var options = new GameObject("Options", typeof(RectTransform), typeof(VerticalLayoutGroup), typeof(ContentSizeFitter), typeof(CanvasGroup));
            options.transform.SetParent(content.transform, false);
            ConfigureVertical(options);
            var optionsGroup = options.GetComponent<CanvasGroup>();
            optionsGroup.alpha = 0f;
            optionsGroup.interactable = false;
            optionsGroup.blocksRaycasts = false;

            var scroll = scrollGo.GetComponent<ScrollRect>();
            scroll.content = contentRt;
            scroll.viewport = viewport.GetComponent<RectTransform>();
            scroll.horizontal = false;
            scroll.vertical = true;

            var templates = new GameObject("UITemplates");
            templates.transform.SetParent(transform, false);
            templates.SetActive(false);

            var rowPrefab = BuildMessageRowPrefab(templates.transform);

            var stream = canvasGo.AddComponent<DialogueStreamPresenter>();
            SetPrivate(stream, "messageRowPrefab", rowPrefab);
            SetPrivate(stream, "messageContainer", messages.GetComponent<RectTransform>());
            SetPrivate(stream, "scrollRect", scroll);

            OptionItem yarnOption = null;
#if UNITY_EDITOR
            yarnOption = UnityEditor.AssetDatabase.LoadAssetAtPath<OptionItem>(
                "Packages/dev.yarnspinner.unity/Prefabs/Option Item.prefab");
#endif
            if (yarnOption == null)
            {
                yarnOption = BuildFallbackOptionItem(templates.transform);
            }

            var optionsPresenter = canvasGo.AddComponent<DialogueStreamOptionsPresenter>();
            SetPrivate(optionsPresenter, "optionViewPrefab", yarnOption);
            SetPrivate(optionsPresenter, "optionsContainer", options.transform);
            SetPrivate(optionsPresenter, "canvasGroup", optionsGroup);

            var transition = FindFirstObjectByType<DialogueTransitionController>();
            if (transition != null)
            {
                SetPrivate(transition, "dialogueUI", canvasGo);
            }

            // Interactors used to be pushed this canvas here. DialogueInteractor resolves
            // it from the runner at the point of use instead, so there is nothing to push.
        }

        DialogueMessageRow BuildMessageRowPrefab(Transform parent)
        {
            var root = new GameObject("DialogueMessageRow", typeof(RectTransform), typeof(DialogueMessageRow), typeof(VerticalLayoutGroup), typeof(ContentSizeFitter));
            root.transform.SetParent(parent, false);
            var layout = root.GetComponent<VerticalLayoutGroup>();
            layout.padding = new RectOffset(12, 12, 8, 8);
            layout.spacing = 4f;
            layout.childControlHeight = true;
            layout.childControlWidth = true;
            layout.childForceExpandWidth = true;
            layout.childForceExpandHeight = false;
            root.GetComponent<ContentSizeFitter>().verticalFit = ContentSizeFitter.FitMode.PreferredSize;

            var speaker = CreateTmp("Speaker", root.transform, 22f, FontStyles.Bold);
            var body = CreateTmp("Body", root.transform, 28f, FontStyles.Normal);
            var row = root.GetComponent<DialogueMessageRow>();
            SetPrivate(row, "speakerText", speaker);
            SetPrivate(row, "bodyText", body);
            SetPrivate(row, "speakerLabel", speaker.gameObject);
            return row;
        }

        OptionItem BuildFallbackOptionItem(Transform parent)
        {
            var go = new GameObject("OptionItem", typeof(RectTransform), typeof(Image), typeof(OptionItem));
            go.transform.SetParent(parent, false);
            go.GetComponent<Image>().color = new Color(0.15f, 0.15f, 0.2f, 1f);
            var text = CreateTmp("Text", go.transform, 24f, FontStyles.Normal);
            Stretch(text.rectTransform);
            SetPrivate(go.GetComponent<OptionItem>(), "text", text);
            return go.GetComponent<OptionItem>();
        }

        void BuildHud()
        {
            var canvasGo = CreateCanvas("HudCanvas", 10);
            var panel = new GameObject("PortraitPanel", typeof(RectTransform), typeof(CanvasGroup), typeof(Image), typeof(Button));
            panel.transform.SetParent(canvasGo.transform, false);
            var rt = panel.GetComponent<RectTransform>();
            rt.anchorMin = new Vector2(1f, 0f);
            rt.anchorMax = new Vector2(1f, 0f);
            rt.pivot = new Vector2(1f, 0f);
            rt.sizeDelta = new Vector2(220f, 280f);
            rt.anchoredPosition = new Vector2(-24f, 24f);
            panel.GetComponent<Image>().color = new Color(0.15f, 0.15f, 0.18f, 0.95f);

            // Lives in Assets/Art/UI/Placeholder/Resources so this resolves in
            // builds too — the AssetDatabase fallback below is editor-only.
            var sprite = Resources.Load<Sprite>("portrait_placeholder");
#if UNITY_EDITOR
            if (sprite == null)
            {
                sprite = UnityEditor.AssetDatabase.LoadAssetAtPath<Sprite>(
                    "Assets/Art/UI/Placeholder/Resources/portrait_placeholder.png");
            }
#endif
            if (sprite != null)
            {
                panel.GetComponent<Image>().sprite = sprite;
                panel.GetComponent<Image>().preserveAspect = true;
            }

            var hint = CreateTmp("TabHint", panel.transform, 18f, FontStyles.Normal);
            hint.text = "Tab";
            hint.alignment = TextAlignmentOptions.Center;
            var hintRt = hint.rectTransform;
            hintRt.anchorMin = new Vector2(0f, 0f);
            hintRt.anchorMax = new Vector2(1f, 0f);
            hintRt.pivot = new Vector2(0.5f, 0f);
            hintRt.sizeDelta = new Vector2(0f, 28f);
            hintRt.anchoredPosition = new Vector2(0f, 4f);

            var view = canvasGo.AddComponent<PortraitHudView>();
            SetPrivate(view, "panelRoot", panel);
        }

        void BuildMenu()
        {
            var canvasGo = CreateCanvas("PlayerMenuCanvas", 20);
            var rootGroup = canvasGo.AddComponent<CanvasGroup>();
            rootGroup.alpha = 0f;
            rootGroup.interactable = false;
            rootGroup.blocksRaycasts = false;

            var dimmer = new GameObject("Dimmer", typeof(RectTransform), typeof(Image));
            dimmer.transform.SetParent(canvasGo.transform, false);
            Stretch(dimmer.GetComponent<RectTransform>());
            dimmer.GetComponent<Image>().color = new Color(0f, 0f, 0f, 0.6f);

            var body = new GameObject("MenuBody", typeof(RectTransform), typeof(Image));
            body.transform.SetParent(canvasGo.transform, false);
            var bodyRt = body.GetComponent<RectTransform>();
            bodyRt.anchorMin = new Vector2(0.15f, 0.1f);
            bodyRt.anchorMax = new Vector2(0.85f, 0.9f);
            bodyRt.offsetMin = Vector2.zero;
            bodyRt.offsetMax = Vector2.zero;
            body.GetComponent<Image>().color = new Color(0.08f, 0.08f, 0.1f, 0.98f);

            var tabBarGo = new GameObject("TabBar", typeof(RectTransform), typeof(HorizontalLayoutGroup), typeof(MenuTabBar));
            tabBarGo.transform.SetParent(body.transform, false);
            var tabBarRt = tabBarGo.GetComponent<RectTransform>();
            tabBarRt.anchorMin = new Vector2(0f, 1f);
            tabBarRt.anchorMax = new Vector2(1f, 1f);
            tabBarRt.pivot = new Vector2(0.5f, 1f);
            tabBarRt.sizeDelta = new Vector2(0f, 56f);
            var tabHlg = tabBarGo.GetComponent<HorizontalLayoutGroup>();
            tabHlg.spacing = 8f;
            tabHlg.padding = new RectOffset(12, 12, 8, 8);
            // childControl* default to false on a script-added layout group.
            tabHlg.childControlWidth = true;
            tabHlg.childControlHeight = true;
            tabHlg.childForceExpandWidth = true;
            tabHlg.childForceExpandHeight = true;

            var contentArea = new GameObject("ContentArea", typeof(RectTransform));
            contentArea.transform.SetParent(body.transform, false);
            var contentRt = contentArea.GetComponent<RectTransform>();
            contentRt.anchorMin = Vector2.zero;
            contentRt.anchorMax = Vector2.one;
            contentRt.offsetMin = new Vector2(16f, 16f);
            contentRt.offsetMax = new Vector2(-16f, -64f);

            var characterPanel = CreateTabPanel("CharacterPanel", contentArea.transform);
            var skillsPanel = CreateTabPanel("SkillsPanel", contentArea.transform);
            var journalPanel = CreateTabPanel("JournalPanel", contentArea.transform);

            // Character
            var charVlg = characterPanel.AddComponent<VerticalLayoutGroup>();
            charVlg.spacing = 12f;
            charVlg.padding = new RectOffset(8, 8, 8, 8);
            charVlg.childControlWidth = true;
            charVlg.childControlHeight = true;
            charVlg.childForceExpandWidth = true;
            var charView = characterPanel.AddComponent<CharacterPanelView>();
            var nameLabel = CreateTmp("Name", characterPanel.transform, 36f, FontStyles.Bold);
            var aliasLabel = CreateTmp("Alias", characterPanel.transform, 28f, FontStyles.Italic);
            var invLabel = CreateTmp("Inventory", characterPanel.transform, 24f, FontStyles.Normal);
            SetPrivate(charView, "nameLabel", nameLabel);
            SetPrivate(charView, "aliasLabel", aliasLabel);
            SetPrivate(charView, "inventoryPlaceholder", invLabel);

            // Skills
            var skillsContent = new GameObject("Content", typeof(RectTransform), typeof(VerticalLayoutGroup), typeof(ContentSizeFitter));
            skillsContent.transform.SetParent(skillsPanel.transform, false);
            Stretch(skillsContent.GetComponent<RectTransform>());
            ConfigureVertical(skillsContent);
            skillsContent.GetComponent<RectTransform>().anchorMin = new Vector2(0f, 1f);
            skillsContent.GetComponent<RectTransform>().anchorMax = new Vector2(1f, 1f);
            skillsContent.GetComponent<RectTransform>().pivot = new Vector2(0.5f, 1f);

            var axisHeader = CreateTmp("AxisHeaderTemplate", skillsContent.transform, 20f, FontStyles.Bold);
            axisHeader.gameObject.SetActive(false);
            var templates = GameObject.Find("UI System")?.transform.Find("UITemplates")
                ?? new GameObject("UITemplates").transform;
            if (templates.parent == null && transform != null)
            {
                templates.SetParent(transform, false);
                templates.gameObject.SetActive(false);
            }

            var rowPrefab = BuildSkillRowPrefab(templates);
            var skillsView = skillsPanel.AddComponent<SkillsPanelView>();
            SetPrivate(skillsView, "contentRoot", skillsContent.GetComponent<RectTransform>());
            SetPrivate(skillsView, "rowPrefab", rowPrefab);
            SetPrivate(skillsView, "axisHeaderPrefab", axisHeader);
            SetPrivate(skillsView, "displayMaxRank", 6);

            // Journal
            var journalView = journalPanel.AddComponent<JournalPanelView>();
            var journalLabel = CreateTmp("Placeholder", journalPanel.transform, 28f, FontStyles.Italic);
            journalLabel.text = "Nothing recorded yet.";
            journalLabel.alignment = TextAlignmentOptions.Center;
            Stretch(journalLabel.rectTransform);
            SetPrivate(journalView, "placeholderLabel", journalLabel);

            var charBtn = CreateTabButton("Character", tabBarGo.transform);
            var skillsBtn = CreateTabButton("Skills", tabBarGo.transform);
            var journalBtn = CreateTabButton("Journal", tabBarGo.transform);

            var tabBar = tabBarGo.GetComponent<MenuTabBar>();
            var tabs = new MenuTabBar.TabEntry[3];
            tabs[0] = new MenuTabBar.TabEntry
            {
                button = charBtn,
                panel = characterPanel.GetComponent<CanvasGroup>(),
                onShown = new UnityEngine.Events.UnityEvent(),
            };
            // Panels toggle via CanvasGroup, never SetActive, so OnEnable fires
            // once at construction and never again — before Yarn has set
            // $player_name_full. Refresh on show or the tab stays stale forever.
            tabs[0].onShown.AddListener(charView.Refresh);
            tabs[1] = new MenuTabBar.TabEntry
            {
                button = skillsBtn,
                panel = skillsPanel.GetComponent<CanvasGroup>(),
                onShown = new UnityEngine.Events.UnityEvent(),
            };
            tabs[1].onShown.AddListener(skillsView.Refresh);
            tabs[2] = new MenuTabBar.TabEntry
            {
                button = journalBtn,
                panel = journalPanel.GetComponent<CanvasGroup>(),
                onShown = new UnityEngine.Events.UnityEvent(),
            };
            tabBar.SetTabs(tabs);

            var player = GameObject.Find("PlayerArmature");
            var menuController = canvasGo.AddComponent<PlayerMenuController>();
            SetPrivate(menuController, "menuRoot", canvasGo);
            SetPrivate(menuController, "menuInput", player != null ? player.GetComponent<PlayerMenuInput>() : null);
            SetPrivate(menuController, "controlLock", player != null ? player.GetComponent<PlayerControlLock>() : null);
            SetPrivate(menuController, "tabBar", tabBar);

            // Portrait click
            var portraitButton = FindFirstObjectByType<PortraitHudView>()?.GetComponentInChildren<Button>(true);
            if (portraitButton != null)
            {
                portraitButton.onClick.AddListener(menuController.Open);
            }
        }

        SkillRowView BuildSkillRowPrefab(Transform parent)
        {
            var root = new GameObject("SkillRow", typeof(RectTransform), typeof(SkillRowView), typeof(HorizontalLayoutGroup));
            root.transform.SetParent(parent, false);
            var hlg = root.GetComponent<HorizontalLayoutGroup>();
            hlg.padding = new RectOffset(8, 8, 4, 4);
            hlg.spacing = 12f;
            hlg.childAlignment = TextAnchor.MiddleLeft;
            hlg.childControlHeight = true;
            hlg.childControlWidth = true;
            hlg.childForceExpandHeight = true;

            var stripe = new GameObject("Accent", typeof(RectTransform), typeof(Image), typeof(LayoutElement));
            stripe.transform.SetParent(root.transform, false);
            stripe.GetComponent<LayoutElement>().preferredWidth = 6f;
            stripe.GetComponent<Image>().color = Color.white;

            var name = CreateTmp("Name", root.transform, 24f, FontStyles.Bold);
            name.GetComponent<LayoutElement>().flexibleWidth = 1f;

            var bar = new GameObject("Bar", typeof(RectTransform), typeof(Image), typeof(LayoutElement));
            bar.transform.SetParent(root.transform, false);
            bar.GetComponent<Image>().color = new Color(0.2f, 0.2f, 0.22f);
            bar.GetComponent<LayoutElement>().preferredWidth = 160f;
            bar.GetComponent<LayoutElement>().preferredHeight = 16f;

            var fill = new GameObject("Fill", typeof(RectTransform), typeof(Image));
            fill.transform.SetParent(bar.transform, false);
            Stretch(fill.GetComponent<RectTransform>());
            var fillImage = fill.GetComponent<Image>();
            fillImage.type = Image.Type.Filled;
            fillImage.fillMethod = Image.FillMethod.Horizontal;
            fillImage.color = Color.white;

            var rank = CreateTmp("Rank", root.transform, 24f, FontStyles.Normal);
            rank.alignment = TextAlignmentOptions.Right;
            rank.GetComponent<LayoutElement>().preferredWidth = 40f;

            var view = root.GetComponent<SkillRowView>();
            SetPrivate(view, "nameLabel", name);
            SetPrivate(view, "rankLabel", rank);
            SetPrivate(view, "barFill", fillImage);
            SetPrivate(view, "accentStripe", stripe.GetComponent<Image>());
            return view;
        }

        void EnsureCameraFraming()
        {
            var vcam = GameObject.Find("CinemachineCamera");
            if (vcam == null)
            {
                return;
            }

            var framing = vcam.GetComponent<DialogueCameraFraming>();
            if (framing == null)
            {
                framing = vcam.AddComponent<DialogueCameraFraming>();
            }

            SetPrivate(framing, "composer", vcam.GetComponent<CinemachinePositionComposer>());
            SetPrivate(framing, "dialogueScreenX", -0.17f);
        }

        void WireDialogueRunner()
        {
            var runner = FindFirstObjectByType<DialogueRunner>();
            var stream = FindFirstObjectByType<DialogueStreamPresenter>();
            var options = FindFirstObjectByType<DialogueStreamOptionsPresenter>();
            var advancer = FindFirstObjectByType<LineAdvancer>();
            if (runner == null || stream == null || options == null)
            {
                return;
            }

            var list = new System.Collections.Generic.List<DialoguePresenterBase>();
            list.Add(stream);
            list.Add(options);
            if (advancer != null)
            {
                list.Add(advancer);
                SetPrivate(advancer, "presenter", stream);
            }

            runner.DialoguePresenters = list;
        }

        void HidePackageDialogueCanvas()
        {
            var dialogueSystem = GameObject.Find("Dialogue System");
            if (dialogueSystem == null)
            {
                return;
            }

            var packageCanvas = dialogueSystem.transform.Find("Canvas");
            if (packageCanvas == null)
            {
                return;
            }

            var banner = packageCanvas.Find("Skill Check Banner");
            var streamCanvas = GameObject.Find("DialogueStreamCanvas");
            if (banner != null && streamCanvas != null)
            {
                banner.SetParent(streamCanvas.transform, false);
                var bannerRt = banner.GetComponent<RectTransform>();
                if (bannerRt != null)
                {
                    bannerRt.anchorMin = new Vector2(0f, 0.85f);
                    bannerRt.anchorMax = new Vector2(0.66f, 1f);
                    bannerRt.offsetMin = new Vector2(16f, 0f);
                    bannerRt.offsetMax = new Vector2(-16f, -16f);
                }
            }

            packageCanvas.gameObject.SetActive(false);
        }

        static GameObject CreateCanvas(string name, int sortingOrder)
        {
            var go = new GameObject(name, typeof(RectTransform), typeof(Canvas), typeof(CanvasScaler), typeof(GraphicRaycaster));
            var canvas = go.GetComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            canvas.sortingOrder = sortingOrder;
            var scaler = go.GetComponent<CanvasScaler>();
            scaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            scaler.referenceResolution = new Vector2(1920f, 1080f);
            scaler.matchWidthOrHeight = 0.5f;
            return go;
        }

        static GameObject CreateTabPanel(string name, Transform parent)
        {
            var go = new GameObject(name, typeof(RectTransform), typeof(CanvasGroup));
            go.transform.SetParent(parent, false);
            Stretch(go.GetComponent<RectTransform>());
            var group = go.GetComponent<CanvasGroup>();
            group.alpha = 0f;
            group.interactable = false;
            group.blocksRaycasts = false;
            return go;
        }

        static Button CreateTabButton(string label, Transform parent)
        {
            var go = new GameObject(label, typeof(RectTransform), typeof(Image), typeof(Button), typeof(LayoutElement));
            go.transform.SetParent(parent, false);
            go.GetComponent<Image>().color = new Color(0.2f, 0.2f, 0.25f, 1f);
            var text = CreateTmp("Label", go.transform, 22f, FontStyles.Bold);
            text.text = label;
            text.alignment = TextAlignmentOptions.Center;
            Stretch(text.rectTransform);
            return go.GetComponent<Button>();
        }

        static TextMeshProUGUI CreateTmp(string name, Transform parent, float size, FontStyles style)
        {
            var go = new GameObject(name, typeof(RectTransform), typeof(TextMeshProUGUI), typeof(LayoutElement));
            go.transform.SetParent(parent, false);
            var tmp = go.GetComponent<TextMeshProUGUI>();
            tmp.fontSize = size;
            tmp.fontStyle = style;
            tmp.color = Color.white;
            tmp.enableWordWrapping = true;
            tmp.text = name;
            // No LayoutElement.preferredHeight — it would pin wrapped text to a
            // single line's height and make stream rows overlap. See the same
            // note in UILayerSetup.CreateTmp.
            return tmp;
        }

        static void Stretch(RectTransform rt, float pad = 0f)
        {
            rt.anchorMin = Vector2.zero;
            rt.anchorMax = Vector2.one;
            rt.offsetMin = new Vector2(pad, pad);
            rt.offsetMax = new Vector2(-pad, -pad);
        }

        static void ConfigureVertical(GameObject go)
        {
            var rt = go.GetComponent<RectTransform>();
            rt.anchorMin = new Vector2(0f, 0f);
            rt.anchorMax = new Vector2(1f, 0f);
            rt.pivot = new Vector2(0.5f, 0f);
            // See UILayerSetup.ConfigureVerticalContent: a script-added
            // RectTransform starts at sizeDelta (100,100), which overhangs 50px
            // off each side under stretch anchors and gets sheared by the mask.
            rt.sizeDelta = new Vector2(0f, rt.sizeDelta.y);
            rt.anchoredPosition = Vector2.zero;
            var vlg = go.GetComponent<VerticalLayoutGroup>();
            vlg.childControlHeight = true;
            vlg.childControlWidth = true;
            vlg.childForceExpandHeight = false;
            vlg.childForceExpandWidth = true;
            vlg.spacing = 4f;
            go.GetComponent<ContentSizeFitter>().verticalFit = ContentSizeFitter.FitMode.PreferredSize;
        }

        static void SetPrivate(object target, string fieldName, object value)
        {
            var type = target.GetType();
            while (type != null)
            {
                var field = type.GetField(fieldName, System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Public);
                if (field != null)
                {
                    field.SetValue(target, value);
                    return;
                }

                type = type.BaseType;
            }

            Debug.LogWarning($"[UILayerBootstrap] Could not set field '{fieldName}' on {target.GetType().Name}");
        }
    }
}