/* =============================================================
 * @whynot/design — atoms.js
 * ------------------------------------------------------------
 *   <wn-button>, <wn-tag>, <wn-eyebrow>, <wn-stamp>,
 *   <wn-stage-dot>, <wn-phase-dot>, <wn-icon>
 *
 * Shadow-DOM components. Each adopts the shared component
 * stylesheet so utility classes inside the shadow root work.
 * Token CSS variables cascade through shadow boundaries
 * because they're inherited properties.
 * ============================================================= */

import { LitElement, html, nothing } from "lit";
import { getSharedSheet } from "./_styles.js";
import { ICON_PATHS } from "./icons.js";

class WnBase extends LitElement {
  static styles = [];
  connectedCallback() {
    super.connectedCallback();
    // Adopt the shared sheet on first connect, after super() has built the shadow root.
    const root = this.shadowRoot;
    if (root && !root.adoptedStyleSheets.includes(getSharedSheet())) {
      root.adoptedStyleSheets = [...root.adoptedStyleSheets, getSharedSheet()];
    }
  }
}

/* ---------- <wn-button> ---------- */
export class WnButton extends WnBase {
  static properties = {
    variant:  { type: String, reflect: true },
    size:     { type: String, reflect: true },
    icon:     { type: String },
    iconEnd:  { type: String, attribute: "icon-end" },
    type:     { type: String },
    disabled: { type: Boolean, reflect: true },
    href:     { type: String },
  };
  constructor() {
    super();
    this.variant = "secondary";
    this.size = "md";
    this.type = "button";
    this.disabled = false;
  }
  render() {
    const cls = [
      "wn-btn",
      this.variant && this.variant !== "secondary" ? `wn-btn--${this.variant}` : "",
      this.size === "sm" ? "wn-btn--sm" : this.size === "lg" ? "wn-btn--lg" : "",
    ].filter(Boolean).join(" ");
    const iconStart = this.icon
      ? html`<wn-icon name=${this.icon} size="sm" class="wn-btn__icon"></wn-icon>`
      : nothing;
    const iconEnd = this.iconEnd
      ? html`<wn-icon name=${this.iconEnd} size="sm" class="wn-btn__icon"></wn-icon>`
      : nothing;
    if (this.href) {
      return html`<a class=${cls} href=${this.href} part="button"
                     aria-disabled=${this.disabled ? "true" : "false"}>${iconStart}<slot></slot>${iconEnd}</a>`;
    }
    return html`<button class=${cls} part="button"
                        type=${this.type} ?disabled=${this.disabled}>${iconStart}<slot></slot>${iconEnd}</button>`;
  }
}

/* ---------- <wn-tag> ---------- */
export class WnTag extends WnBase {
  static properties = {
    active: { type: Boolean, reflect: true },
    draft:  { type: Boolean, reflect: true },
  };
  render() {
    const cls = ["wn-tag",
      this.active ? "wn-tag--active" : "",
      this.draft ? "wn-tag--draft" : "",
    ].filter(Boolean).join(" ");
    return html`<span class=${cls} part="tag"><slot></slot></span>`;
  }
}

/* ---------- <wn-eyebrow> ---------- */
export class WnEyebrow extends WnBase {
  static properties = { strong: { type: Boolean, reflect: true } };
  render() {
    const cls = "wn-eyebrow" + (this.strong ? " wn-eyebrow--strong" : "");
    return html`<span class=${cls} part="eyebrow"><slot></slot></span>`;
  }
}

/* ---------- <wn-stamp> ---------- */
export class WnStamp extends WnBase {
  render() { return html`<span class="wn-stamp" part="stamp"><slot></slot></span>`; }
}

/* ---------- <wn-stage-dot> ---------- */
export class WnStageDot extends WnBase {
  static properties = {
    level: { type: String, reflect: true },
    label: { type: String },
  };
  constructor() { super(); this.level = "S2"; }
  render() {
    const lvl = String(this.level || "S2").toLowerCase();
    const cls = `wn-dot wn-stage-dot wn-stage-dot--${lvl}`;
    return html`
      <span class=${cls} part="root">
        <span class="wn-dot__bullet"></span>
        <slot>${this.label || this.level}</slot>
      </span>`;
  }
}

/* ---------- <wn-phase-dot> ---------- */
export class WnPhaseDot extends WnBase {
  static properties = {
    state: { type: String, reflect: true },
    num:   { type: String, reflect: true },
  };
  constructor() { super(); this.state = "todo"; this.num = ""; }
  render() {
    const cls = `wn-phase-dot wn-phase-dot--${this.state}`;
    const glyph = this.state === "done" ? "✓" : this.num;
    return html`
      <span class=${cls} part="root">
        <span class="wn-phase-dot__bullet">${glyph}</span>
        <slot></slot>
      </span>`;
  }
}

/* ---------- <wn-icon> ---------- */
export class WnIcon extends WnBase {
  static properties = {
    name: { type: String, reflect: true },
    size: { type: String, reflect: true },
  };
  constructor() { super(); this.size = "md"; }
  render() {
    const path = ICON_PATHS[this.name];
    const cls = `wn-icon wn-icon--${this.size || "md"}`;
    if (!path) {
      return html`<svg class=${cls} viewBox="0 0 24 24" aria-hidden="true" part="svg">
        <rect x="3" y="3" width="18" height="18" rx="2" fill="none" stroke="currentColor"/>
      </svg>`;
    }
    return html`<svg class=${cls} viewBox="0 0 24 24" aria-hidden="true" part="svg">${
      path.map(d => html`<path d=${d}></path>`)
    }</svg>`;
  }
}

export function defineAtoms() {
  if (!customElements.get("wn-button"))    customElements.define("wn-button",    WnButton);
  if (!customElements.get("wn-tag"))       customElements.define("wn-tag",       WnTag);
  if (!customElements.get("wn-eyebrow"))   customElements.define("wn-eyebrow",   WnEyebrow);
  if (!customElements.get("wn-stamp"))     customElements.define("wn-stamp",     WnStamp);
  if (!customElements.get("wn-stage-dot")) customElements.define("wn-stage-dot", WnStageDot);
  if (!customElements.get("wn-phase-dot")) customElements.define("wn-phase-dot", WnPhaseDot);
  if (!customElements.get("wn-icon"))      customElements.define("wn-icon",      WnIcon);
}

export { WnBase };