// modal.js — reusable themed modal/dialog component, shared by the
// dashboard and the per-agent UI. An in-theme replacement for the
// browser's native `confirm()` / `alert()` overlays so destructive
// actions and prompts match each page's chrome instead of a jarring OS
// dialog.
//
// Implemented as two shadow-DOM custom elements (`<hive-dialog>`,
// `<hive-toast>`), plus `<hive-btn>` (hive-btn.js) for the dialog's own
// buttons — real per-component style encapsulation, CSS in real `.css`
// files imported as raw text (see each component's own header comment
// for the design rationale: shadow-DOM-vs-light-DOM tradeoffs live atop
// the `<hive-dialog>`/`<hive-toast>` classes below, the customized-
// built-in choice lives in hive-btn.js). Other `.btn` consumers across
// the app stay on the light-DOM `.btn` class for now — migrating them
// is a separate follow-up.
//
// `openDialog` is the general primitive (any title/message/content + a row of
// buttons); `themedConfirm` is a thin cancel/confirm wrapper with optional
// checkboxes built on top of it.

import { el } from './dom.js';
import './hive-btn.js'; // registers <hive-btn> — side-effect import, no named export needed
import dialogCss from './hive-dialog.css';
import toastCss from './hive-toast.css';

// Attach an open shadow root to `host`, adopt `ownCssText` (a scoped
// stylesheet built fresh per call from a real .css file's contents,
// imported as raw text), and return the shadow root for the caller to
// populate.
function attachShadow(host, ownCssText) {
  const root = host.attachShadow({ mode: 'open' });
  const sheet = new CSSStyleSheet();
  sheet.replaceSync(ownCssText);
  root.adoptedStyleSheets = [sheet];
  return root;
}

// <hive-dialog> — the backdrop + box custom element behind `openDialog`.
// Not exported; constructed and configured by `openDialog` only. Callers
// set `._opts` before `append()`ing it (custom elements can't take
// constructor args when created via `document.createElement`), then the
// element renders itself in `connectedCallback` and reports the outcome
// via a `hive-dialog-close` CustomEvent (`detail` = the resolved value)
// rather than exposing a resolve/reject pair directly — that keeps the
// element a normal DOM node with a normal event contract instead of a
// bespoke Promise-ish object. The element itself *is* the backdrop
// (`:host` carries the fixed-position/centering rules); the box, title,
// message, content, and buttons all render inside its shadow root.
class HiveDialog extends HTMLElement {
  connectedCallback() {
    const {
      title = '', message = '', content = null,
      buttons = [{ label: 'ok', value: true }],
      danger = false, dismissable = true,
    } = this._opts || {};

    const root = attachShadow(this, dialogCss);

    let settled = false;
    const done = (value) => {
      if (settled) return;
      settled = true;
      document.removeEventListener('keydown', onKey, true);
      this.dispatchEvent(new CustomEvent('hive-dialog-close', { detail: value }));
      this.remove();
    };
    const onKey = (e) => {
      if (dismissable && e.key === 'Escape') {
        e.preventDefault();
        e.stopPropagation();
        done(null);
      }
    };
    this._done = done; // exposed for close-on-escape-elsewhere callers, if ever needed

    const btnEls = buttons.map((b) => {
      // `b.class` names the variant ('cancel' | 'confirm'); `b.danger`
      // overrides it to the 'danger' look regardless (a destructive
      // confirm button reads as danger, not as a plain confirm).
      const variant = b.danger ? 'danger' : b.class;
      const btn = el('button', {
        type: 'button', is: 'hive-btn',
        ...(variant ? { variant } : {}),
      }, b.label);
      btn.addEventListener('click', () => done(b.value));
      return { spec: b, btn };
    });

    // Give the dialog an accessible name: label it by its title if present,
    // else by its message, via `aria-labelledby` (a11y — role=dialog needs a
    // name). Only the labelling element carries the id. IDs are scoped to
    // this shadow root, so no cross-instance collision risk even without
    // the random suffix — kept anyway since it costs nothing and guards
    // against a future shared-DOM edge case (e.g. `::part()` piercing).
    const labelId = 'dlg-' + Math.random().toString(36).slice(2, 9);
    const titleEl = title ? el('div', { class: 'title', id: labelId }, title) : null;
    const messageEl = message
      ? el('div', title ? { class: 'message' } : { class: 'message', id: labelId }, message)
      : null;
    const boxAttrs = { class: 'box', role: 'dialog', 'aria-modal': 'true' };
    if (titleEl || messageEl) boxAttrs['aria-labelledby'] = labelId;
    const box = el('div', boxAttrs,
      titleEl,
      messageEl,
      content || null,
      el('div', { class: 'actions' }, ...btnEls.map((b) => b.btn)));
    root.append(box);

    this.addEventListener('click', (e) => {
      if (dismissable && e.target === this) done(null);
    });
    document.addEventListener('keydown', onKey, true);

    const focusTarget = btnEls.find((b) => b.spec.autofocus)
      || (danger ? btnEls.find((b) => !b.spec.danger) : null)
      || btnEls[btnEls.length - 1];
    if (focusTarget) focusTarget.btn.focus();
  }
}
customElements.define('hive-dialog', HiveDialog);

// openDialog({ title, message, content, buttons, danger, dismissable })
//   → Promise resolving to the clicked button's `value`, or `null` when the
//     dialog is dismissed (Escape, backdrop click, or a button whose value is
//     null). `content` is an optional DOM node rendered between the message
//     and the buttons (checkboxes, custom fields, …) — built by the caller
//     with `el()` and appended into the dialog's shadow root once mounted,
//     same as any other node (a JS-created element isn't bound to a
//     document/shadow-root until it's actually appended somewhere).
//     `buttons` is `[{ label, value, danger?, class?, autofocus? }]`,
//     rendered right-aligned. Initial focus: the `autofocus` button if any,
//     else — for a `danger` dialog — the first non-destructive button (so a
//     stray Enter can't fire the destructive path), else the last button.
export function openDialog(opts = {}) {
  return new Promise((resolve) => {
    const dlg = document.createElement('hive-dialog');
    dlg._opts = opts;
    dlg.addEventListener('hive-dialog-close', (e) => resolve(e.detail), { once: true });
    document.body.append(dlg);
  });
}

// themedConfirm({ title, message, danger, confirmLabel, cancelLabel, checkboxes })
//   → Promise<null | { [name]: bool }>. `null` = cancelled; otherwise an
//   object of the checkbox states keyed by `name` (`{}` when there are none).
//   Example:
//     const r = await themedConfirm({ message: `stop ${n}?`, danger: true,
//       confirmLabel: '■ stop', checkboxes: [{ name: 'graceful', label: '…' }] });
//     if (!r) return;            // cancelled
//     doStop(r.graceful);
export function themedConfirm(opts = {}) {
  const {
    title = '', message = '', danger = false,
    confirmLabel = 'confirm', cancelLabel = 'cancel', checkboxes = [],
  } = opts;

  const boxes = checkboxes.map((cb) => {
    const input = el('input', { type: 'checkbox', class: 'check', name: cb.name });
    if (cb.checked) input.checked = true;
    const row = el('label', { class: 'checkrow' },
      input, el('span', {}, cb.label || cb.name));
    return { input, row };
  });
  const content = boxes.length
    ? el('div', { class: 'checks' }, ...boxes.map((b) => b.row))
    : null;

  return openDialog({
    title,
    message,
    content,
    danger,
    buttons: [
      { label: cancelLabel, value: null, class: 'cancel', autofocus: danger },
      { label: confirmLabel, value: 'confirm', danger, class: 'confirm', autofocus: !danger },
    ],
  }).then((v) => {
    if (v !== 'confirm') return null;
    const out = {};
    for (let i = 0; i < boxes.length; i++) out[checkboxes[i].name] = boxes[i].input.checked;
    return out;
  });
}

// themedPrompt({ title, message, label, placeholder, value, confirmLabel, cancelLabel })
//   → Promise<string | null>. Themed replacement for window.prompt(): a
//   resizable <textarea> dialog that resolves to the entered string on confirm,
//   or null on cancel. Chat-box key behaviour: **Enter submits**, **Shift+Enter
//   inserts a newline** — so short answers are one keystroke while multi-line
//   reasons (e.g. an approval deny note) are still possible. Escape cancels
//   (via openDialog).
export function themedPrompt(opts = {}) {
  const {
    title = '', message = '', label = '', placeholder = '', value = '',
    confirmLabel = 'ok', cancelLabel = 'cancel',
  } = opts;
  const input = el('textarea', { class: 'input textarea', rows: '3', placeholder });
  if (value) input.value = value;
  // Enter submits (clicks the confirm button mounted by openDialog);
  // Shift+Enter falls through to the textarea's default newline insert.
  // `closest()`/`querySelector()` stay within the shadow tree the input
  // lives in, so this resolves to the dialog's own `.box`/confirm button
  // without leaking across instances. The confirm button is selected by
  // its `variant` attribute now (hive-btn.js), not a CSS class.
  input.addEventListener('keydown', (e) => {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault();
      input.closest('.box')?.querySelector('[variant="confirm"]')?.click();
    }
  });
  const content = el('div', { class: 'promptfield' },
    label ? el('label', { class: 'promptlabel' }, label) : null,
    input);
  const result = openDialog({
    title,
    message,
    content,
    buttons: [
      { label: cancelLabel, value: '__cancel__', class: 'cancel' },
      { label: confirmLabel, value: '__ok__', class: 'confirm', autofocus: true },
    ],
  }).then((v) => (v === '__ok__' ? input.value : null));
  // Prefer focusing the field over the OK button once the dialog has mounted.
  setTimeout(() => input.focus(), 0);
  return result;
}

// <hive-toast> — one transient notification entry. Owns its own
// auto-dismiss timer via connectedCallback/disconnectedCallback (cleared
// on removal so a toast dismissed early by click doesn't leave a stray
// timer), rather than the closure-captured timer handle the pre-custom-
// element version used. Callers set `._message`/`._opts` before append —
// same reason as `<hive-dialog>` above. The element itself is the visible
// toast box (`:host` carries the styling, `:host(.error)` etc. switch on
// a plain class the host carries) — the message text renders directly in
// the shadow root rather than via a `<slot>`, since there's no external
// light-DOM content to project.
class HiveToast extends HTMLElement {
  connectedCallback() {
    const { type = 'info', duration } = this._opts || {};
    const ms = duration != null ? duration : (type === 'error' ? 8000 : 4000);
    const root = attachShadow(this, toastCss);
    this.classList.add(type);
    this.setAttribute('role', type === 'error' ? 'alert' : 'status');
    root.textContent = this._message || '';
    let removed = false;
    this._remove = () => {
      if (removed) return;
      removed = true;
      this.classList.add('out');
      setTimeout(() => this.remove(), 200);
    };
    this.addEventListener('click', this._remove);
    if (ms > 0) this._timer = setTimeout(this._remove, ms);
  }
  disconnectedCallback() {
    clearTimeout(this._timer);
  }
}
customElements.define('hive-toast', HiveToast);

// themedToast(message, { type, duration }) — non-blocking transient
//   notification; a lighter alternative to a modal for feedback that needs no
//   decision (errors, validation, status). Stacks in a fixed top-right
//   container, auto-dismisses after `duration` ms (errors linger longer), and
//   can be clicked to dismiss early. `type` ∈ {'info','error','ok'}.
//   The stack container is a plain positioning wrapper (not itself a
//   component — no theming, no encapsulation need), so it's styled with a
//   one-off inline style rather than a stylesheet.
export function themedToast(message, opts = {}) {
  let container = document.getElementById('tc-toasts');
  if (!container) {
    container = document.createElement('div');
    container.id = 'tc-toasts';
    Object.assign(container.style, {
      position: 'fixed',
      top: '1em',
      right: '1em',
      zIndex: '1100',
      display: 'flex',
      flexDirection: 'column',
      gap: '0.5em',
      maxWidth: 'min(28em, 92vw)',
      pointerEvents: 'none',
    });
    document.body.append(container);
  }
  const toast = document.createElement('hive-toast');
  toast._message = message;
  toast._opts = opts;
  container.append(toast);
  return toast;
}