import { MenuConfig, MenuItemConfig } from '@src/common/interfaces/ClientUiMenu.interface';
import extensionCss from '@src/main.css?inline';

export class ClientMenu {
  private host!: HTMLDivElement;
  private shadow!: ShadowRoot;
  private root!: HTMLDivElement;
  private visible = false;

  constructor(private config: MenuConfig) {}

  mount(anchorElement: HTMLElement) {
    this.createHost();
    this.createShadow();
    this.createMenu();
    this.position(anchorElement);
    this.bindGlobalMouse(anchorElement);

    document.documentElement.appendChild(this.host);
  }

  private createHost() {
    this.host = document.createElement("div");
    Object.assign(this.host.style, {
      position: "fixed",
      inset: "0",
      zIndex: "2147483647",
      // pointerEvents: "none",
      backgroundColor: "#00000099",
    });
    this.host.textContent="SAMPLE TEXT SAMPLE TEXT SAMPLE TEXT"
  }

  private createShadow() {
    this.shadow = this.host.attachShadow({ mode: "open" });
    this.injectStyles();
  }

  private createMenu() {
    this.root = document.createElement("div");
    this.root.className = "menu-root font-mono";

    const trigger = document.createElement("div");
    trigger.className = "menu-trigger";
    trigger.textContent = "☰";

    const submenu = this.buildSubmenu(this.config.items);

    trigger.addEventListener("mouseenter", () => this.show());
    this.root.addEventListener("mouseleave", () => this.hide());

    this.root.append(trigger, submenu);
    this.shadow.appendChild(this.root);
  }

  private buildSubmenu(items: MenuItemConfig[]): HTMLDivElement {
    const menu = document.createElement("div");
    menu.className = "submenu";

    for (const item of items) {
      const el = document.createElement("div");
      el.className = "menu-item";

      if (item.customHTML) {
        el.appendChild(item.customHTML);
      } else {
        el.textContent = item.label;
      }

      if (item.action) {
        el.addEventListener("click", e => {
          e.stopPropagation();
          item.action?.();
          this.hide();
        });
      }

      if (item.subitems) {
        el.appendChild(this.buildSubmenu(item.subitems));
      }

      menu.appendChild(el);
    }

    return menu;
  }
  private injectStyles() {
    const style = document.createElement("style");
    console.warn('imported styles: imported CSS (raw):', typeof extensionCss, extensionCss);
    let css =  extensionCss
      .trim()
      .replace(/'html, body \{/g, ':host {')
      .replace(/'body \{/g, ':host {')
    ;

    // this is bad but I can't be bothered to do it the proper way
    const cssArr: string[] = css.split('@font-face');

    css = `
      ${cssArr[0]}
      @font-face {
        font-family: "Heebo";
        src: url(__FONT_HEEBO__) format("truetype-variations");
        font-weight: 100 900;
        font-stretch: 75% 125%;
        font-style: normal;
        font-display: swap;
      }

      @font-face {
        font-family: "Source Code Pro";
        src: url(__FONT_SCP__) format("truetype-variations");
        font-weight: 200 900;
        font-style: normal;
        font-display: swap;
      }

      @font-face {
        font-family: "Source Code Pro";
        src: url(__FONT_SCPI__) format("truetype-variations");
        font-weight: 200 900;
        font-style: italic;
        font-display: swap;
      }
      ${cssArr[cssArr.length - 1].split('}', 2)[1]};
    `;

    // function scopeCss(css: string) {
      // return css.replace(
      //   /(^|})\s*([^{@}][^{]*){/g,
      //   (_, sep, selector) => `${sep} :host ${selector} {`
      // );
    // }

    css = css
      .replace('__FONT_HEEBO__', chrome.runtime.getURL('/ui/res/fonts/Heebo.ttf'))
      .replace('__FONT_SCP__', chrome.runtime.getURL('/ui/res/fonts/SourceCodePro.ttf'))
      .replace('__FONT_SCPI__', chrome.runtime.getURL('/ui/res/fonts/SourceCodePro-Italic.ttf'))
      .replaceAll('html,', '')
    ;

    // console.warn('CSS TO APPEND', css);
    style.textContent = css;
    this.shadow.appendChild(style);

  }

  private position(anchorEl: HTMLElement) {
    const rect = anchorEl.getBoundingClientRect();
    const r = this.root.style;

    switch (this.config.anchor) {
      case "LeftCenter":
        r.left = "0";
        r.top = "50%";
        r.transform = "translateY(-50%)";
        break;

      case "TopLeft":
        r.left = "0";
        r.top = "0";
        break;

      // others are trivial extensions
    }
  }

  private bindGlobalMouse(anchorEl: HTMLElement) {
    const rect = anchorEl.getBoundingClientRect();
    const cx = rect.left + rect.width / 2;
    const cy = rect.top + rect.height / 2;

    document.addEventListener("mousemove", e => {
      const d = Math.hypot(e.clientX - cx, e.clientY - cy);
      if (d < this.config.activationRadius) {
        this.show();
      } else if (!this.root.matches(":hover")) {
        this.hide();
      }
    });
  }

  private show() {
    if (!this.visible) {
      this.visible = true;
      this.root.classList.add("visible");
    }
  }

  private hide() {
    if (this.visible) {
      this.visible = false;
      this.root.classList.remove("visible");
    }
  }
}