import logger from 'App/logger';

import type Screen from '../../Screen/Screen';
import type { Message, SetNodeScroll } from '../../messages';
import { MType } from '../../messages';
import ListWalker from '../../../common/ListWalker';
import StylesManager from './StylesManager';
import FocusManager from './FocusManager';
import SelectionManager from './SelectionManager';
import {
  StyleElement,
  VSpriteMap,
  OnloadStyleSheet,
  VDocument,
  VElement,
  VHTMLElement,
  VShadowRoot,
  VText,
  OnloadVRoot,
} from './VirtualDOM';
import { deleteRule, insertRule } from './safeCSSRules';

function isStyleVElement(
  vElem: VElement,
): vElem is VElement & { node: StyleElement } {
  return vElem.tagName.toLowerCase() === 'style';
}

function setupWindowLogging(
  vTexts: Map<number, VText>,
  vElements: Map<number, VElement>,
  olVRoots: Map<number, OnloadVRoot>,
) {
  // @ts-ignore
  window.checkVElements = () => vElements;
  // @ts-ignore
  window.checkVTexts = () => vTexts;
  // @ts-ignore
  window.checkVRoots = () => olVRoots;
}

const IGNORED_ATTRS = ['autocomplete'];
const ATTR_NAME_REGEXP = /([^\t\n\f \/>"'=]+)/;

export default class DOMManager extends ListWalker<Message> {
  private readonly vTexts: Map<number, VText> = new Map(); // map vs object here?
  private readonly vElements: Map<number, VElement> = new Map();
  private readonly olVRoots: Map<number, OnloadVRoot> = new Map();
  /** required to keep track of iframes, frameId : vnodeId */
  private readonly iframeRoots: Record<number, number> = {};
  private shadowRootParentMap: Map<number, number> = new Map();
  /** Constructed StyleSheets https://developer.mozilla.org/en-US/docs/Web/API/Document/adoptedStyleSheets
   * as well as <style> tag owned StyleSheets
   */
  private olStyleSheets: Map<number, OnloadStyleSheet> = new Map();
  /** @depreacted since tracker 4.0.2 Mapping by nodeID */
  private olStyleSheetsDeprecated: Map<number, OnloadStyleSheet> = new Map();
  private upperBodyId: number = -1;
  private nodeScrollManagers: Map<number, ListWalker<SetNodeScroll>> =
    new Map();
  private stylesManager: StylesManager;
  private focusManager: FocusManager = new FocusManager(this.vElements);
  private selectionManager: SelectionManager;
  private readonly screen: Screen;
  private readonly isMobile: boolean;
  private readonly stringDict: Record<number, string>;
  private readonly globalDict: {
    get: (key: string) => string | undefined;
    all: () => Record<string, string>;
  };
  public readonly time: number;
  private virtualMode: boolean = false;
  private showVModeBadge?: () => void;

  constructor(params: {
    screen: Screen;
    isMobile: boolean;
    setCssLoading: ConstructorParameters<typeof StylesManager>[1];
    time: number;
    stringDict: Record<number, string>;
    globalDict: {
      get: (key: string) => string | undefined;
      all: () => Record<string, string>;
    };
    virtualMode?: boolean;
    showVModeBadge?: () => void;
  }) {
    super();
    this.screen = params.screen;
    this.isMobile = params.isMobile;
    this.time = params.time;
    this.stringDict = params.stringDict;
    this.globalDict = params.globalDict;
    this.selectionManager = new SelectionManager(this.vElements, params.screen);
    this.stylesManager = new StylesManager(params.screen, params.setCssLoading);
    this.virtualMode = params.virtualMode || false;
    this.showVModeBadge = params.showVModeBadge;
    setupWindowLogging(this.vTexts, this.vElements, this.olVRoots);
  }

  public clearSelectionManager() {
    this.selectionManager.clearSelection();
  }

  append(m: Message): void {
    if (m.tp === MType.SetNodeScroll) {
      let scrollManager = this.nodeScrollManagers.get(m.id);
      if (!scrollManager) {
        scrollManager = new ListWalker();
        this.nodeScrollManagers.set(m.id, scrollManager);
      }
      scrollManager.append(m);
      return;
    }
    if (m.tp === MType.SetNodeFocus) {
      this.focusManager.append(m);
      return;
    }
    if (m.tp === MType.SelectionChange) {
      this.selectionManager.append(m);
      return;
    }
    if (m.tp === MType.CreateElementNode) {
      if (m.tag === 'BODY' && this.upperBodyId === -1) {
        this.upperBodyId = m.id;
      }
    } else if (
      m.tp === MType.SetNodeAttribute &&
      (IGNORED_ATTRS.includes(m.name) || !ATTR_NAME_REGEXP.test(m.name))
    ) {
      logger.log('Ignorring message: ', m);
      return; // Ignoring
    }
    super.append(m);
  }

  private removeBodyScroll(id: number, vElem: VElement): void {
    if (this.isMobile && this.upperBodyId === id) {
      // Need more type safety!
      (vElem.node as HTMLBodyElement).style.overflow = 'hidden';
    }
  }

  private removeAutocomplete(vElem: VElement): boolean {
    const tag = vElem.tagName;
    if (['FORM', 'TEXTAREA', 'SELECT'].includes(tag)) {
      vElem.setAttribute('autocomplete', 'off');
      return true;
    }
    if (tag === 'INPUT') {
      vElem.setAttribute('autocomplete', 'new-password');
      return true;
    }
    return false;
  }

  public getNode(id: number) {
    const mappedId = this.shadowRootParentMap.get(id);
    if (mappedId !== undefined) {
      // If this is a shadow root ID, return the parent element instead
      return this.vElements.get(mappedId);
    }
    return this.vElements.get(id) || this.vTexts.get(id);
  }

  private insertNode(msg: {
    parentID: number;
    id: number;
    index: number;
  }): void {
    let { parentID, id, index } = msg;

    // Check if parentID is a shadow root, and get the real parent element if so
    const actualParentID = this.shadowRootParentMap.get(parentID);
    if (actualParentID !== undefined) {
      parentID = actualParentID;
    }

    const child = this.vElements.get(id) || this.vTexts.get(id);
    if (!child) {
      logger.error('Insert error. Node not found', id);
      return;
    }

    const parent = this.vElements.get(parentID) || this.olVRoots.get(parentID);
    if (!parent) {
      logger.error(
        `${id} Insert error. Parent vNode ${parentID} not found`,
        msg,
        this.vElements,
        this.olVRoots,
      );
      return;
    }

    if (parent instanceof VElement && isStyleVElement(parent)) {
      // TODO: if this ever happens? ; Maybe do not send empty TextNodes in tracker
      const styleNode = parent.node;
      if (
        styleNode.sheet &&
        styleNode.sheet.cssRules &&
        styleNode.sheet.cssRules.length > 0 &&
        styleNode.textContent &&
        styleNode.textContent.trim().length === 0
      ) {
        logger.log(
          'Trying to insert child to a style tag with virtual rules: ',
          parent,
          child,
        );
        return;
      }
    }

    parent.insertChildAt(child, index);
  }

  private setNodeAttribute(msg: { id: number; name: string; value: string }) {
    let { name, value } = msg;
    const vn = this.vElements.get(msg.id);
    if (!vn) {
      logger.error('SetNodeAttribute: Node not found', msg);
      return;
    }

    if (vn.tagName === 'INPUT' && name === 'name') {
      // Otherwise binds local autocomplete values (maybe should ignore on the tracker level?)
      return;
    }
    if (name === 'href' && vn.tagName === 'LINK') {
      // @ts-ignore  ?global ENV type   // It've been done on backend (remove after testing in saas)
      // if (value.startsWith(window.env.ASSETS_HOST || window.location.origin + '/assets')) {
      //   value = value.replace("?", "%3F");
      // }
      if (!value.startsWith('http')) {
        /* blob:... value can happen here for some reason.
         * which will result in that link being unable to load and having 4sec timeout in the below function.
         */
        return;
      }

      // TODOTODO: check if node actually exists on the page, not just in memory
      this.stylesManager.setStyleHandlers(vn.node as HTMLLinkElement, value);
    }
    if (vn.isSVG && value.startsWith('url(')) {
      /* SVG shape ID-s for masks etc. Sometimes referred with the full-page url, which we don't have in replay */
      value = `url(#${value.split('#')[1] || ')'}`;
    }
    vn.setAttribute(name, value);
    this.removeBodyScroll(msg.id, vn);
  }

  private applyMessage = (msg: Message): Promise<any> | undefined => {
    switch (msg.tp) {
      case MType.CreateDocument: {
        const doc = this.screen.document;
        if (!doc) {
          logger.error('No root iframe document found', msg, this.screen);
          return;
        }
        doc.open();
        doc.write('<!DOCTYPE html><html></html>');
        doc.close();
        const fRoot = doc.documentElement;
        fRoot.innerText = '';

        const vHTMLElement = new VHTMLElement(fRoot);
        this.vElements.clear();
        this.vElements.set(0, vHTMLElement);
        const vDoc = OnloadVRoot.fromDocumentNode(doc);
        vDoc.insertChildAt(vHTMLElement, 0);
        this.olVRoots.clear();
        this.olVRoots.set(0, vDoc); // watchout: id==0 for both Document and documentElement
        // this is done for the AdoptedCSS logic
        // Maybetodo: start Document as 0-node in tracker
        this.vTexts.clear();
        this.stylesManager.reset();
        return;
      }
      case MType.CreateTextNode: {
        const vText = new VText();
        this.vTexts.set(msg.id, vText);
        this.insertNode(msg);
        return;
      }
      case MType.CreateElementNode: {
        // if (msg.tag.toLowerCase() === 'canvas') msg.tag = 'video'
        const vElem = new VElement(msg.tag, msg.svg, msg.index, msg.id);
        if (['STYLE', 'style', 'LINK'].includes(msg.tag)) {
          vElem.prioritized = true;
        }
        if (this.vElements.has(msg.id)) {
          logger.error('CreateElementNode: Node already exists', msg);
          return;
        }
        this.vElements.set(msg.id, vElem);
        this.insertNode(msg);
        this.removeBodyScroll(msg.id, vElem);
        this.removeAutocomplete(vElem);
        return;
      }
      case MType.MoveNode: {
        // if the parent ID is in shadow root map -> custom elements case
        if (this.shadowRootParentMap.has(msg.parentID)) {
          msg.parentID = this.shadowRootParentMap.get(msg.parentID)!;
        }
        this.insertNode(msg);
        return;
      }
      case MType.RemoveNode: {
        const vChild = this.vElements.get(msg.id) || this.vTexts.get(msg.id);
        if (!vChild) {
          logger.error('RemoveNode: Node not found', msg);
          return;
        }
        if (!vChild.parentNode) {
          logger.error('RemoveNode: Parent node not found', msg);
          return;
        }
        vChild.parentNode.removeChild(vChild);
        this.vElements.delete(msg.id);
        this.vTexts.delete(msg.id);
        return;
      }
      case MType.SetNodeAttribute:
        this.setNodeAttribute(msg);
        return;
      case MType.SetNodeAttributeDictGlobal:
      case MType.SetNodeAttributeDict:
        const name = this.globalDict.get(msg.name);
        const value = this.globalDict.get(msg.value);
        if (name === undefined) {
          logger.error(
            "No dictionary key for msg 'name': ",
            msg,
            this.globalDict.all(),
          );
          return;
        }
        if (value === undefined) {
          logger.error(
            "No dictionary key for msg 'value': ",
            msg,
            this.globalDict.all(),
          );
          return;
        }
        this.setNodeAttribute({
          id: msg.id,
          name,
          value,
        });
        return;
      case MType.SetNodeAttributeDictDeprecated:
        this.stringDict[msg.nameKey] === undefined &&
          logger.error(
            "No local dictionary key for msg 'name': ",
            msg,
            this.stringDict,
          );
        this.stringDict[msg.valueKey] === undefined &&
          logger.error(
            "No local dictionary key for msg 'value': ",
            msg,
            this.stringDict,
          );
        if (
          this.stringDict[msg.nameKey] === undefined ||
          this.stringDict[msg.valueKey] === undefined
        ) {
          return;
        }
        this.setNodeAttribute({
          id: msg.id,
          name: this.stringDict[msg.nameKey],
          value: this.stringDict[msg.valueKey],
        });
        return;
      case MType.RemoveNodeAttribute: {
        const vElem = this.vElements.get(msg.id);
        if (!vElem) {
          logger.error('RemoveNodeAttribute: Node not found', msg);
          return;
        }
        vElem.removeAttribute(msg.name);
        return;
      }
      case MType.SetInputValue: {
        const vElem = this.vElements.get(msg.id);
        if (!vElem) {
          logger.error('SetInoputValue: Node not found', msg);
          return;
        }
        const nodeWithValue = vElem.node;
        if (
          !(
            nodeWithValue instanceof HTMLInputElement ||
            nodeWithValue instanceof HTMLTextAreaElement ||
            nodeWithValue instanceof HTMLSelectElement
          )
        ) {
          logger.error('Trying to set value of non-Input element', msg);
          return;
        }
        const val = msg.mask > 0 ? '*'.repeat(msg.mask) : msg.value;
        const doc = this.screen.document;
        if (doc && nodeWithValue === doc.activeElement) {
          // For the case of Remote Control
          nodeWithValue.onblur = () => {
            nodeWithValue.value = val;
          };
          return;
        }
        nodeWithValue.value = val; // Maybe make special VInputValueElement type for lazy value update
        return;
      }
      case MType.SetInputChecked: {
        const vElem = this.vElements.get(msg.id);
        if (!vElem) {
          logger.error('SetInputChecked: Node not found', msg);
          return;
        }
        (vElem.node as HTMLInputElement).checked = msg.checked; // Maybe make special VCheckableElement type for lazy checking
        return;
      }
      case MType.SetNodeData:
      case MType.SetCssData: {
        const vText = this.vTexts.get(msg.id);
        if (!vText) {
          logger.error('SetNodeData/SetCssData: Node not found', msg);
          return;
        }
        vText.setData(msg.data);
        return;
      }
      case MType.CreateIFrameDocument: {
        const vElem = this.vElements.get(msg.frameID);
        if (!vElem) {
          logger.error('CreateIFrameDocument: Node not found', msg);
          return;
        }
        // shadow DOM for a custom element + SALESFORCE (<slot>)
        const isCustomElement =
          vElem.tagName.includes('-') || vElem.tagName === 'SLOT';
        const hasSlots = vElem.tagName === 'SLOT';

        if (isCustomElement) {
          if (this.virtualMode) {
            // Store the mapping but don't create the actual shadow root
            this.shadowRootParentMap.set(msg.id, msg.frameID);
            return;
          } else if (hasSlots) {
            this.showVModeBadge?.();
          }
        }

        // Real iframes
        if (this.iframeRoots[msg.frameID] && !this.olVRoots.has(msg.id)) {
          this.olVRoots.delete(this.iframeRoots[msg.frameID]);
        }
        this.iframeRoots[msg.frameID] = msg.id;
        const vRoot = OnloadVRoot.fromVElement(vElem);
        vRoot.catch((e) => logger.warn(e, msg));
        this.olVRoots.set(msg.id, vRoot);
        return;
      }
      case MType.AdoptedSsInsertRule: {
        const styleSheet = this.olStyleSheets.get(msg.sheetID);
        if (!styleSheet) {
          logger.warn(
            'No stylesheet was created for ',
            msg,
            this.olStyleSheets,
          );
          return;
        }
        insertRule(styleSheet, msg);
        return;
      }
      case MType.AdoptedSsDeleteRule: {
        const styleSheet = this.olStyleSheets.get(msg.sheetID);
        if (!styleSheet) {
          logger.warn('No stylesheet was created for ', msg);
          return;
        }
        deleteRule(styleSheet, msg);
        return;
      }
      case MType.AdoptedSsReplace: {
        const styleSheet = this.olStyleSheets.get(msg.sheetID);
        if (!styleSheet) {
          logger.warn('No stylesheet was created for ', msg);
          return;
        }
        // @ts-ignore (configure ts with recent WebaAPI)
        styleSheet.replaceSync(msg.text);
        return;
      }
      case MType.AdoptedSsAddOwner: {
        const vRoot = this.olVRoots.get(msg.id);
        if (!vRoot) {
          /* <style> tag case */
          const vElem = this.vElements.get(msg.id);
          if (!vElem) {
            logger.error('AdoptedSsAddOwner: Node not found', msg);
            return;
          }
          if (!isStyleVElement(vElem)) {
            logger.error('Non-style owner', msg);
            return;
          }
          this.olStyleSheets.set(
            msg.sheetID,
            OnloadStyleSheet.fromStyleElement(vElem.node),
          );
          return;
        }
        /* Constructed StyleSheet case */
        let olStyleSheet = this.olStyleSheets.get(msg.sheetID);
        if (!olStyleSheet) {
          olStyleSheet = OnloadStyleSheet.fromVRootContext(vRoot);
          this.olStyleSheets.set(msg.sheetID, olStyleSheet);
        }
        olStyleSheet.whenReady((styleSheet) => {
          vRoot.onNode((node) => {
            // @ts-ignore
            node.adoptedStyleSheets = [...node.adoptedStyleSheets, styleSheet];
          });
        });
        return;
      }
      case MType.AdoptedSsRemoveOwner: {
        const olStyleSheet = this.olStyleSheets.get(msg.sheetID);
        if (!olStyleSheet) {
          logger.warn(
            'AdoptedSsRemoveOwner: No stylesheet was created for ',
            msg,
          );
          return;
        }
        const vRoot = this.olVRoots.get(msg.id);
        if (!vRoot) {
          logger.error('AdoptedSsRemoveOwner: Owner node not found', msg);
          return;
        }
        olStyleSheet.whenReady((styleSheet) => {
          vRoot.onNode((node) => {
            // @ts-ignore
            node.adoptedStyleSheets = [...vRoot.node.adoptedStyleSheets].filter(
              (s) => s !== styleSheet,
            );
          });
        });
        return;
      }
      case MType.LoadFontFace: {
        const vRoot = this.olVRoots.get(msg.parentID);
        if (!vRoot) {
          logger.error('LoadFontFace: Node not found', msg);
          return;
        }
        vRoot.whenReady((vNode) => {
          if (vNode instanceof VShadowRoot) {
            logger.error(`Node ${vNode} expected to be a Document`, msg);
            return;
          }
          let descr: object | undefined;
          if (msg.descriptors) {
            try {
              descr = JSON.parse(msg.descriptors);
              descr = typeof descr === 'object' ? descr : undefined;
            } catch {
              logger.warn("Can't parse font-face descriptors: ", msg);
            }
          }
          const ff = new FontFace(msg.family, msg.source, descr);
          vNode.node.fonts.add(ff);
          void ff.load();
        });
      }
    }
  };

  /**
   * Moves and applies all the messages from the current (or from the beginning, if t < current.time)
   * to the one with msg[time] >= `t`
   *
   * This function autoresets pointer if necessary (better name?)
   *
   * @returns Promise that fulfills when necessary changes get applied
   *   (the async part exists mostly due to styles loading)
   */
  async moveReady(t: number): Promise<void> {
    this.moveApply(t, this.applyMessage);
    this.olVRoots.forEach((rt) => rt.applyChanges());
    // Thinkabout (read): css preload
    // What if we go back before it is ready? We'll have two handlres?
    return this.stylesManager.moveReady().then(() => {
      /* Waiting for styles to be applied first */
      /* Applying focus */
      this.focusManager.move(t);
      /* Applying text selections */
      this.selectionManager.move(t);
      /* Applying all scrolls */
      this.nodeScrollManagers.forEach((manager) => {
        const msg = manager.moveGetLast(t);
        if (msg) {
          let scrollVHost: VElement | OnloadVRoot | undefined;
          if ((scrollVHost = this.vElements.get(msg.id))) {
            scrollVHost.node.scrollLeft = msg.x;
            scrollVHost.node.scrollTop = msg.y;
          } else if ((scrollVHost = this.olVRoots.get(msg.id))) {
            scrollVHost.whenReady((vNode) => {
              if (vNode instanceof VDocument) {
                vNode.node.defaultView?.scrollTo(msg.x, msg.y);
              }
            });
          }
        }
      });
    });
  }
}