// rc-loader.js
(function () {
    var scriptElement = document.currentScript;
    var baseUrl = scriptElement.src.replace(/\/scripts\/rc-loader\.js(\?.*)?$/, '');
    var HEALTHCHECK_SCRIPT_URL = baseUrl + "/scripts/health-check.js";
    var LOG_PREFIX = "[sdk][loader]";
    var iframeObserverTimer = null;
    var DEBUG_ENABLED = scriptElement.getAttribute("data-debug") === "true";

    function getAccessibleWindows(targetWindow) {
        var windows = [];

        function pushWindow(candidate) {
            if (!candidate) return;
            if (windows.indexOf(candidate) >= 0) return;
            try {
                void candidate.location.href;
                windows.push(candidate);
            } catch (e) {
                // Cross-origin window; ignore.
            }
        }

        pushWindow(targetWindow && targetWindow.top);
        pushWindow(targetWindow && targetWindow.parent);
        pushWindow(targetWindow);

        return windows;
    }

    function getStorageValue(targetWindow, type, key) {
        var windows = getAccessibleWindows(targetWindow);
        for (var i = 0; i < windows.length; i++) {
            try {
                var storage = windows[i][type];
                if (!storage) continue;
                var value = storage.getItem(key);
                if (value !== null && value !== undefined) return value;
            } catch (e) {
                // Ignore inaccessible storage.
            }
        }
        return null;
    }

    function setStorageValue(targetWindow, type, key, value) {
        var windows = getAccessibleWindows(targetWindow);
        for (var i = 0; i < windows.length; i++) {
            try {
                var storage = windows[i][type];
                if (!storage) continue;
                storage.setItem(key, value);
                return true;
            } catch (e) {
                // Ignore inaccessible storage.
            }
        }
        return false;
    }

    function removeStorageValue(targetWindow, type, key) {
        var windows = getAccessibleWindows(targetWindow);
        for (var i = 0; i < windows.length; i++) {
            try {
                var storage = windows[i][type];
                if (!storage) continue;
                storage.removeItem(key);
                return true;
            } catch (e) {
                // Ignore inaccessible storage.
            }
        }
        return false;
    }

    function attachSharedRuntime(doc) {
        if (!doc || !doc.defaultView) return;
        doc.defaultView.__SDK_SHARED__ = {
            getStorageItem: function (type, key) {
                return getStorageValue(doc.defaultView, type, key);
            },
            setStorageItem: function (type, key, value) {
                return setStorageValue(doc.defaultView, type, key, value);
            },
            removeStorageItem: function (type, key) {
                return removeStorageValue(doc.defaultView, type, key);
            }
        };
    }

    function loadScriptInto(doc, id, src, attrs) {
        if (!doc || !doc.head) return;
        var existing = doc.getElementById(id);
        if (existing) {
            var existingSrc = existing.getAttribute("src") || "";
            if (existingSrc === src) return;
            existing.remove();
        }
        var s = doc.createElement("script");
        s.src = src;
        s.id = id;
        s.async = true;
        s.onload = function () {
            if (DEBUG_ENABLED) console.log(LOG_PREFIX, "loaded", id, src);
        };
        s.onerror = function (e) { console.error(LOG_PREFIX, "error", id, src, e); };
        if (attrs) {
            for (var key in attrs) {
                s.setAttribute(key, attrs[key]);
            }
        }
        doc.head.appendChild(s);
    }

    function loadScriptsForDoc(doc) {
        attachSharedRuntime(doc);
        loadScriptInto(doc, "healthcheck-sdk", HEALTHCHECK_SCRIPT_URL);
    }

    function tryLoadIntoSameOriginIframes() {
        var iframes = document.querySelectorAll("iframe");
        for (var i = 0; i < iframes.length; i++) {
            try {
                var iframeDoc = iframes[i].contentDocument;
                if (!iframeDoc) continue;
                loadScriptsForDoc(iframeDoc);
            } catch (e) {
                // Cross-origin iframe; ignore.
            }
        }
    }

    function init() {
        loadScriptsForDoc(document);
        tryLoadIntoSameOriginIframes();

        if (iframeObserverTimer) clearInterval(iframeObserverTimer);
        iframeObserverTimer = setInterval(tryLoadIntoSameOriginIframes, 3000);
    }

    if (document.readyState === "loading") {
        document.addEventListener("DOMContentLoaded", init);
    } else {
        init();
    }
})();