/**
 * Campaign UTM link helper (composer + report).
 * utm_source from data-utm-source (brand slug), utm_medium=email|sms|postcard,
 * utm_campaign=slug(name). Short URLs come from the portal JSON endpoint.
 */
(function (global) {
  "use strict";

  var SLUG_MAX = 80;
  var SHORTEN_WAIT_MS = 400;
  var SHORT_URL_RE =
    /https?:\/\/(?:(?:www\.)?(?:beta\.)?piha\.li|(?:127\.0\.0\.1|localhost):\d+)\/[a-z0-9]{4,8}/i;

  function slug(name) {
    var s = String(name || "")
      .trim()
      .toLowerCase()
      .replace(/[^a-z0-9]+/g, "-")
      .replace(/^-+|-+$/g, "");
    return (s || "campaign").slice(0, SLUG_MAX);
  }

  function sourceFrom(panel) {
    return slug((panel && panel.getAttribute("data-utm-source")) || "campaign");
  }

  function utmUrlRe(source) {
    return new RegExp(
      "https?:\\/\\/[^\\s<>\"]+utm_source=" + source + "[^\\s<>\"]*",
      "i"
    );
  }

  function buildUrl(base, medium, name, source) {
    var root = String(base || "").replace(/\/+$/, "");
    var ch = String(medium || "email").toLowerCase();
    if (ch !== "email" && ch !== "sms" && ch !== "postcard") ch = "email";
    var q =
      "utm_source=" +
      encodeURIComponent(source || "campaign") +
      "&utm_medium=" +
      encodeURIComponent(ch) +
      "&utm_campaign=" +
      encodeURIComponent(slug(name));
    return root + "/?" + q;
  }

  function replaceTextUrl(text, url, source) {
    var raw = String(text || "");
    var utmRe = utmUrlRe(source || "campaign");
    if (utmRe.test(raw)) {
      return raw.replace(utmRe, url);
    }
    if (SHORT_URL_RE.test(raw)) {
      return raw.replace(SHORT_URL_RE, url);
    }
    var trimmed = raw.replace(/\s+$/, "");
    return trimmed ? trimmed + "\n\n" + url : url;
  }

  function linkify(text) {
    var esc = String(text || "").replace(/[&<>"']/g, function (c) {
      return (
        { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[
          c
        ] || c
      );
    });
    return esc.replace(
      /(https?:\/\/[^\s]+)/g,
      '<a href="$1" rel="noopener noreferrer">$1</a>'
    );
  }

  function ensureQuillLink(quill, url, label, source) {
    if (!quill || !quill.root) return;
    var src = source || "campaign";
    var existing = quill.root.querySelectorAll(
      'a[data-campaign-utm], a[href*="utm_source=' +
        src +
        '"], a[href*="piha.li/"]'
    );
    if (existing.length) {
      existing.forEach(function (a) {
        a.setAttribute("href", url);
        a.setAttribute("data-campaign-utm", "1");
      });
      return;
    }
    var labelText = label || "Website";
    var start = Math.max(0, quill.getLength() - 1);
    quill.insertText(start, "\n" + labelText, "silent");
    quill.formatText(start + 1, labelText.length, "link", url, "silent");
    var links = quill.root.querySelectorAll("a");
    var last = links[links.length - 1];
    if (last) last.setAttribute("data-campaign-utm", "1");
  }

  function renderQr(canvas, url) {
    if (!canvas || !url || typeof QRCode === "undefined") return Promise.resolve();
    return QRCode.toCanvas(canvas, url, {
      width: 192,
      margin: 1,
      color: { dark: "#00626c", light: "#ffffff" },
    });
  }

  function flash(el, okText, errText, ok) {
    if (!el) return;
    el.textContent = ok ? okText : errText;
    el.hidden = false;
    window.setTimeout(function () {
      el.hidden = true;
    }, 2200);
  }

  function copyText(text) {
    if (navigator.clipboard && navigator.clipboard.writeText) {
      return navigator.clipboard.writeText(text);
    }
    return Promise.reject(new Error("clipboard unavailable"));
  }

  function copyCanvas(canvas) {
    if (!canvas || !canvas.toBlob) {
      return Promise.reject(new Error("canvas unavailable"));
    }
    return new Promise(function (resolve, reject) {
      canvas.toBlob(function (blob) {
        if (!blob) {
          reject(new Error("qr blob failed"));
          return;
        }
        if (
          !navigator.clipboard ||
          !navigator.clipboard.write ||
          typeof ClipboardItem === "undefined"
        ) {
          reject(new Error("image clipboard unavailable"));
          return;
        }
        navigator.clipboard
          .write([new ClipboardItem({ "image/png": blob })])
          .then(resolve, reject);
      }, "image/png");
    });
  }

  function downloadCanvas(canvas, filename) {
    if (!canvas) return;
    var a = document.createElement("a");
    a.href = canvas.toDataURL("image/png");
    a.download = filename || "campaign-qr.png";
    document.body.appendChild(a);
    a.click();
    a.remove();
  }

  function bindPanel(panel, opts) {
    if (!panel) return;
    opts = opts || {};
    var urlEl = panel.querySelector("[data-utm-url]");
    var canvas = panel.querySelector("[data-utm-qr]");
    var qrWrap = panel.querySelector("[data-utm-qr-wrap]");
    var smsHint = panel.querySelector("[data-utm-sms-hint]");
    var emailHint = panel.querySelector("[data-utm-email-hint]");
    var postcardHint = panel.querySelector("[data-utm-postcard-hint]");
    var statusEl = panel.querySelector("[data-utm-status]");
    var base = panel.getAttribute("data-base-url") || "";
    var source = sourceFrom(panel);
    var label = panel.getAttribute("data-link-label") || "Website";
    var live = panel.getAttribute("data-live") === "1";
    var shortenUrl = panel.getAttribute("data-shorten-url") || "";
    var csrf = (opts.csrfToken || panel.getAttribute("data-csrf") || "").trim();
    var shortenTimer = null;
    var shortenSeq = 0;

    function medium() {
      if (typeof opts.getMedium === "function") return opts.getMedium();
      return panel.getAttribute("data-medium") || "email";
    }

    function name() {
      if (typeof opts.getName === "function") return opts.getName();
      return panel.getAttribute("data-campaign-name") || "";
    }

    function campaignId() {
      return (
        (typeof opts.getCampaignId === "function" && opts.getCampaignId()) ||
        panel.getAttribute("data-campaign-id") ||
        ""
      );
    }

    function paint(url, inject) {
      var ch = medium();
      if (urlEl) urlEl.textContent = url;
      if (qrWrap) qrWrap.hidden = ch !== "postcard";
      if (smsHint) smsHint.hidden = ch !== "sms";
      if (emailHint) emailHint.hidden = ch !== "email";
      if (postcardHint) postcardHint.hidden = ch !== "postcard";
      if (ch === "postcard" && canvas) {
        renderQr(canvas, url).catch(function () {});
      }
      if (inject && typeof opts.onUrlChange === "function") {
        opts.onUrlChange(url, ch, label);
      }
    }

    function apply() {
      var ch = medium();
      var longUrl = buildUrl(base, ch, name(), source);
      if (!shortenUrl) {
        paint(longUrl, true);
        return longUrl;
      }
      paint(longUrl, false);
      var seq = ++shortenSeq;
      window.clearTimeout(shortenTimer);
      shortenTimer = window.setTimeout(function () {
        fetch(shortenUrl, {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
            Accept: "application/json",
            "X-CSRFToken": csrf,
          },
          credentials: "same-origin",
          body: JSON.stringify({
            name: name(),
            medium: ch,
            campaign_id: campaignId(),
          }),
        })
          .then(function (r) {
            return r.ok ? r.json() : Promise.reject();
          })
          .then(function (data) {
            if (seq !== shortenSeq) return;
            paint((data && data.display_url) || longUrl, true);
          })
          .catch(function () {
            if (seq !== shortenSeq) return;
            paint(longUrl, true);
          });
      }, SHORTEN_WAIT_MS);
      return longUrl;
    }

    panel.querySelectorAll("[data-utm-copy-url]").forEach(function (btn) {
      btn.addEventListener("click", function () {
        var url = (urlEl && urlEl.textContent) || "";
        copyText(url).then(
          function () {
            flash(statusEl, "Link copied.", "Could not copy.", true);
          },
          function () {
            flash(statusEl, "", "Could not copy link.", false);
          }
        );
      });
    });
    panel.querySelectorAll("[data-utm-copy-qr]").forEach(function (btn) {
      btn.addEventListener("click", function () {
        copyCanvas(canvas).then(
          function () {
            flash(statusEl, "QR image copied.", "Could not copy QR.", true);
          },
          function () {
            flash(statusEl, "", "Copy failed — use Download PNG.", false);
          }
        );
      });
    });
    panel.querySelectorAll("[data-utm-download-qr]").forEach(function (btn) {
      btn.addEventListener("click", function () {
        downloadCanvas(canvas, "qr-" + slug(name()) + ".png");
        flash(statusEl, "QR downloaded.", "", true);
      });
    });

    if (live) {
      var nameField = document.getElementById("id_name");
      if (nameField) nameField.addEventListener("input", apply);
    }

    panel._utmApply = apply;
    apply();
    return { apply: apply, buildUrl: buildUrl };
  }

  global.CampaignUtm = {
    slug: slug,
    buildUrl: buildUrl,
    replaceTextUrl: replaceTextUrl,
    linkify: linkify,
    ensureQuillLink: ensureQuillLink,
    bindPanel: bindPanel,
  };
})(window);