/**
 * Shared HTML builder for contact links (phone, Telegram) used by day detail,
 * current duty, and duty list.
 */

import { t } from "./i18n.js";
import { escapeHtml } from "./utils.js";

/** Phone icon SVG for block layout (inline, same style as dutyList). */
const ICON_PHONE =
  '<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M22 16.92v3a2 2 0 0 1-2.18 2 19.79 19.79 0 0 1-8.63-3.07 19.5 19.5 0 0 1-6-6 19.79 19.79 0 0 1-3.07-8.67A2 2 0 0 1 4.11 2h3a2 2 0 0 1 2 1.72 12.84 12.84 0 0 0 .7 2.81 2 2 0 0 1-.45 2.11L8.09 9.91a16 16 0 0 0 6 6l1.27-1.27a2 2 0 0 1 2.11-.45 12.84 12.84 0 0 0 2.81.7A2 2 0 0 1 22 16.92z"/></svg>';

/** Telegram / send icon SVG for block layout. */
const ICON_TELEGRAM =
  '<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><line x1="22" y1="2" x2="11" y2="13"/><polygon points="22 2 15 22 11 13 2 9 22 2"/></svg>';

/**
 * Format Russian phone number for display: 79146522209 -> +7 914 652-22-09.
 * Accepts 10 digits (9XXXXXXXXX), 11 digits (79XXXXXXXXX or 89XXXXXXXXX).
 * Other lengths are returned as-is (digits only).
 *
 * @param {string} phone - Raw phone string (digits, optional leading 7/8)
 * @returns {string} Formatted display string, e.g. "+7 914 652-22-09"
 */
export function formatPhoneDisplay(phone) {
  if (phone == null || String(phone).trim() === "") return "";
  const digits = String(phone).replace(/\D/g, "");
  if (digits.length === 10) {
    return "+7 " + digits.slice(0, 3) + " " + digits.slice(3, 6) + "-" + digits.slice(6, 8) + "-" + digits.slice(8);
  }
  if (digits.length === 11 && (digits[0] === "7" || digits[0] === "8")) {
    const rest = digits.slice(1);
    return "+7 " + rest.slice(0, 3) + " " + rest.slice(3, 6) + "-" + rest.slice(6, 8) + "-" + rest.slice(8);
  }
  return digits;
}

/**
 * Build HTML for contact links (phone, Telegram username).
 * Validates phone/username, builds tel: and t.me hrefs, wraps in spans/links.
 *
 * @param {'ru'|'en'} lang - UI language for labels (when showLabels is true)
 * @param {string|null|undefined} phone - Phone number
 * @param {string|null|undefined} username - Telegram username with or without leading @
 * @param {object} options - Rendering options
 * @param {string} options.classPrefix - CSS class prefix (e.g. "day-detail-contact", "duty-contact")
 * @param {boolean} [options.showLabels=true] - Whether to show "Phone:" / "Telegram:" labels (ignored when layout is "block")
 * @param {string} [options.separator=' '] - Separator between contact parts (e.g. " ", " · ")
 * @param {'inline'|'block'} [options.layout='inline'] - "block" = full-width button blocks with SVG icons (for current duty card)
 * @returns {string} HTML string or "" if no valid contact
 */
export function buildContactLinksHtml(lang, phone, username, options) {
  const { classPrefix, showLabels = true, separator = " ", layout = "inline" } = options || {};
  const parts = [];

  if (phone && String(phone).trim()) {
    const p = String(phone).trim();
    const safeHref =
      "tel:" +
      p.replace(/&/g, "&amp;").replace(/"/g, "&quot;").replace(/</g, "&lt;");
    const displayPhone = formatPhoneDisplay(p);
    if (layout === "block") {
      const blockClass = classPrefix + "-block " + classPrefix + "-block--phone";
      parts.push(
        '<a href="' +
          safeHref +
          '" class="' +
          escapeHtml(blockClass) +
          '">' +
          ICON_PHONE +
          "<span>" +
          escapeHtml(displayPhone) +
          "</span></a>"
      );
    } else {
      const linkHtml =
        '<a href="' +
        safeHref +
        '" class="' +
        escapeHtml(classPrefix + "-link " + classPrefix + "-phone") +
        '">' +
        escapeHtml(displayPhone) +
        "</a>";
      if (showLabels) {
        const label = t(lang, "contact.phone");
        parts.push(
          '<span class="' +
            escapeHtml(classPrefix) +
            '">' +
            escapeHtml(label) +
            ": " +
            linkHtml +
            "</span>"
        );
      } else {
        parts.push(linkHtml);
      }
    }
  }

  if (username && String(username).trim()) {
    const u = String(username).trim().replace(/^@+/, "");
    if (u) {
      const display = "@" + u;
      const href = "https://t.me/" + encodeURIComponent(u);
      if (layout === "block") {
        const blockClass = classPrefix + "-block " + classPrefix + "-block--telegram";
        parts.push(
          '<a href="' +
            escapeHtml(href) +
            '" class="' +
            escapeHtml(blockClass) +
            '" target="_blank" rel="noopener noreferrer">' +
            ICON_TELEGRAM +
            "<span>" +
            escapeHtml(display) +
            "</span></a>"
        );
      } else {
        const linkHtml =
          '<a href="' +
          escapeHtml(href) +
          '" class="' +
          escapeHtml(classPrefix + "-link " + classPrefix + "-username") +
          '" target="_blank" rel="noopener noreferrer">' +
          escapeHtml(display) +
          "</a>";
        if (showLabels) {
          const label = t(lang, "contact.telegram");
          parts.push(
            '<span class="' +
              escapeHtml(classPrefix) +
              '">' +
              escapeHtml(label) +
              ": " +
              linkHtml +
              "</span>"
          );
        } else {
          parts.push(linkHtml);
        }
      }
    }
  }

  if (parts.length === 0) return "";
  const rowClass = classPrefix + "-row" + (layout === "block" ? " " + classPrefix + "-row--blocks" : "");
  const inner = layout === "block" ? parts.join("") : parts.join(separator);
  return '<div class="' + escapeHtml(rowClass) + '">' + inner + "</div>";
}