/* ==========================================================================
   DRE Customer Portal — shared JS helpers
   Dependency-free. Relative /api/* calls only (same-origin; Caddy proxies).
   ========================================================================== */

(function (global) {
  "use strict";

  var SESSION_KEY = "dre_session_token";

  /**
   * Perform a JSON fetch against the API.
   * @param {string} path - relative API path, e.g. "/api/claims"
   * @param {object} opts - { method, body, auth, headers }
   * Returns a Promise resolving to { ok, status, data } where data is the
   * parsed JSON body (success payload or {error:{code,message}}).
   */
  function apiFetch(path, opts) {
    opts = opts || {};
    var headers = Object.assign({}, opts.headers || {});
    var fetchOpts = { method: opts.method || "GET", headers: headers };

    if (opts.body !== undefined && !(opts.body instanceof FormData)) {
      headers["Content-Type"] = "application/json";
      fetchOpts.body = JSON.stringify(opts.body);
    } else if (opts.body instanceof FormData) {
      fetchOpts.body = opts.body; // browser sets multipart boundary
    }

    if (opts.auth) {
      var token = getSessionToken();
      if (token) {
        headers["Authorization"] = "Bearer " + token;
      }
    }

    return fetch(path, fetchOpts)
      .then(function (res) {
        return res
          .json()
          .catch(function () {
            return {};
          })
          .then(function (data) {
            return { ok: res.ok, status: res.status, data: data };
          });
      })
      .catch(function (err) {
        return {
          ok: false,
          status: 0,
          data: {
            error: {
              code: "network_error",
              message: "Could not reach the server. Check your connection and try again.",
            },
          },
        };
      });
  }

  function getErrorMessage(result, fallback) {
    if (result && result.data && result.data.error && result.data.error.message) {
      return result.data.error.message;
    }
    return fallback || "Something went wrong. Please try again.";
  }

  function getErrorCode(result) {
    if (result && result.data && result.data.error && result.data.error.code) {
      return result.data.error.code;
    }
    return null;
  }

  function getSessionToken() {
    try {
      return localStorage.getItem(SESSION_KEY);
    } catch (e) {
      return null;
    }
  }

  function setSessionToken(token) {
    try {
      localStorage.setItem(SESSION_KEY, token);
    } catch (e) {
      /* localStorage unavailable; session will not persist across reload */
    }
  }

  function clearSessionToken() {
    try {
      localStorage.removeItem(SESSION_KEY);
    } catch (e) {
      /* ignore */
    }
  }

  function requireSessionOrRedirect(loginUrl) {
    var token = getSessionToken();
    if (!token) {
      window.location.href = loginUrl || "login.html";
      return null;
    }
    return token;
  }

  function formatCentsUSD(cents) {
    var n = typeof cents === "number" ? cents : parseInt(cents, 10) || 0;
    return "$" + (n / 100).toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 });
  }

  function formatDate(iso) {
    if (!iso) return "--";
    try {
      var d = new Date(iso);
      if (isNaN(d.getTime())) return iso;
      return d.toLocaleDateString("en-US", { year: "numeric", month: "short", day: "numeric" });
    } catch (e) {
      return iso;
    }
  }

  function formatDateTime(iso) {
    if (!iso) return "--";
    try {
      var d = new Date(iso);
      if (isNaN(d.getTime())) return iso;
      return d.toLocaleString("en-US", {
        year: "numeric",
        month: "short",
        day: "numeric",
        hour: "numeric",
        minute: "2-digit",
      });
    } catch (e) {
      return iso;
    }
  }

  function formatBytes(n) {
    if (!n && n !== 0) return "";
    if (n < 1024) return n + " B";
    if (n < 1024 * 1024) return (n / 1024).toFixed(1) + " KB";
    return (n / (1024 * 1024)).toFixed(1) + " MB";
  }

  function showAlert(el, message, isVisible) {
    if (!el) return;
    el.textContent = message || "";
    if (isVisible === false) {
      el.classList.remove("is-visible");
    } else {
      el.classList.add("is-visible");
    }
  }

  function hideAlert(el) {
    if (!el) return;
    el.classList.remove("is-visible");
    el.textContent = "";
  }

  function setLoading(button, loading, loadingText, normalText) {
    if (!button) return;
    if (loading) {
      button.disabled = true;
      button.dataset.originalText = button.dataset.originalText || button.innerHTML;
      button.innerHTML = '<span class="dre-spinner"></span> ' + (loadingText || "Please wait...");
    } else {
      button.disabled = false;
      button.innerHTML = normalText || button.dataset.originalText || button.innerHTML;
    }
  }

  function badgeClass(status) {
    return "dre-badge dre-badge-" + (status || "").toLowerCase();
  }

  // Escape helper for any spot where we must build markup with dynamic text.
  // Prefer textContent everywhere; this exists only as a defensive fallback.
  function escapeHtml(str) {
    var div = document.createElement("div");
    div.textContent = str === undefined || str === null ? "" : String(str);
    return div.innerHTML;
  }

  global.DRE = {
    SESSION_KEY: SESSION_KEY,
    apiFetch: apiFetch,
    getErrorMessage: getErrorMessage,
    getErrorCode: getErrorCode,
    getSessionToken: getSessionToken,
    setSessionToken: setSessionToken,
    clearSessionToken: clearSessionToken,
    requireSessionOrRedirect: requireSessionOrRedirect,
    formatCentsUSD: formatCentsUSD,
    formatDate: formatDate,
    formatDateTime: formatDateTime,
    formatBytes: formatBytes,
    showAlert: showAlert,
    hideAlert: hideAlert,
    setLoading: setLoading,
    badgeClass: badgeClass,
    escapeHtml: escapeHtml,
  };
})(window);