(function () {
    const STORAGE_KEY = "csa_cookie_preferences_v3";
    const CONSENT_VERSION = "2026-03-26";

    function gtag() {
        window.dataLayer = window.dataLayer || [];
        window.dataLayer.push(arguments);
    }

    function defaultConsent() {
        return {
            version: CONSENT_VERSION,
            updated_at: null,
            categories: {
                necessary: true,
                measurement: false,
                preferences: false
            }
        };
    }

    function loadSavedConsent() {
        try {
            const raw = localStorage.getItem(STORAGE_KEY);
            if (!raw) {
                return defaultConsent();
            }
            const parsed = JSON.parse(raw);
            return {
                version: parsed.version || CONSENT_VERSION,
                updated_at: parsed.updated_at || null,
                categories: {
                    necessary: true,
                    measurement: !!(parsed.categories && parsed.categories.measurement),
                    preferences: !!(parsed.categories && parsed.categories.preferences)
                }
            };
        } catch (err) {
            return defaultConsent();
        }
    }

    function saveConsent(consent) {
        const payload = {
            version: CONSENT_VERSION,
            updated_at: new Date().toISOString(),
            categories: {
                necessary: true,
                measurement: !!consent.categories.measurement,
                preferences: !!consent.categories.preferences
            }
        };
        localStorage.setItem(STORAGE_KEY, JSON.stringify(payload));
        return payload;
    }

    function applyConsent(consent) {
        gtag("consent", "update", {
            ad_storage: "denied",
            ad_user_data: "denied",
            ad_personalization: "denied",
            analytics_storage: consent.categories.measurement ? "granted" : "denied",
            functionality_storage: consent.categories.preferences ? "granted" : "denied",
            security_storage: "granted"
        });
        maybeLoadGtm(consent);
    }

    function maybeLoadGtm(consent) {
        const cfg = window.CSA_SITE_CONFIG || {};
        if (!consent.categories.measurement) {
            return;
        }
        if (!cfg.gtmId || cfg.gtmId === "GTM-PLACEHOLDER") {
            return;
        }
        if (document.getElementById("csa-gtm-script")) {
            return;
        }
        const script = document.createElement("script");
        script.id = "csa-gtm-script";
        script.async = true;
        script.src = "https://www.googletagmanager.com/gtm.js?id=" + encodeURIComponent(cfg.gtmId);
        document.head.appendChild(script);
    }

    function bannerHtml() {
        return (
            '<div class="container">' +
                '<div class="row g-3 align-items-center">' +
                    '<div class="col-lg-7">' +
                        '<h5 class="fw-bold text-navy mb-2"><i class="fas fa-user-shield text-warning me-2"></i>Privacy and cookie controls</h5>' +
                        '<p class="small text-muted mb-0">' +
                            'Necessary cookies stay enabled for security and session integrity. Measurement and preference cookies stay off until you choose otherwise. You can review this choice at any time from the footer or the legal page.' +
                        '</p>' +
                    '</div>' +
                    '<div class="col-lg-5 d-flex flex-wrap gap-2 justify-content-lg-end">' +
                        '<button class="btn btn-outline-secondary btn-sm" data-cookie-action="reject">Reject non-essential</button>' +
                        '<button class="btn btn-outline-dark btn-sm" data-cookie-action="manage">Manage settings</button>' +
                        '<button class="btn btn-warning btn-sm fw-bold px-4" data-cookie-action="accept">Accept selected defaults</button>' +
                    '</div>' +
                '</div>' +
            '</div>'
        );
    }

    function modalHtml(consent) {
        const measurementChecked = consent.categories.measurement ? "checked" : "";
        const preferencesChecked = consent.categories.preferences ? "checked" : "";
        return (
            '<div class="modal fade" id="csaCookieModal" tabindex="-1" aria-hidden="true">' +
                '<div class="modal-dialog modal-dialog-centered modal-lg">' +
                    '<div class="modal-content">' +
                        '<div class="modal-header">' +
                            '<h5 class="modal-title">Cookie settings</h5>' +
                            '<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>' +
                        '</div>' +
                        '<div class="modal-body">' +
                            '<p class="text-muted">Use granular controls to decide whether this site may load measurement or preference technologies. Necessary cookies remain active because they support security and core functionality.</p>' +
                            '<div class="border rounded-3 p-3 mb-3">' +
                                '<div class="d-flex justify-content-between align-items-start gap-3">' +
                                    '<div>' +
                                        '<h6 class="mb-1">Necessary</h6>' +
                                        '<p class="small text-muted mb-0">Security, consent storage and essential site functions.</p>' +
                                    '</div>' +
                                    '<span class="badge text-bg-secondary">Always on</span>' +
                                '</div>' +
                            '</div>' +
                            '<div class="border rounded-3 p-3 mb-3">' +
                                '<div class="form-check form-switch mb-2">' +
                                    '<input class="form-check-input" type="checkbox" id="cookieMeasurement" ' + measurementChecked + '>' +
                                    '<label class="form-check-label fw-semibold" for="cookieMeasurement">Measurement</label>' +
                                '</div>' +
                                '<p class="small text-muted mb-0">Anonymous traffic measurement and consent-mode compatible analytics only after explicit consent.</p>' +
                            '</div>' +
                            '<div class="border rounded-3 p-3">' +
                                '<div class="form-check form-switch mb-2">' +
                                    '<input class="form-check-input" type="checkbox" id="cookiePreferences" ' + preferencesChecked + '>' +
                                    '<label class="form-check-label fw-semibold" for="cookiePreferences">Preferences</label>' +
                                '</div>' +
                                '<p class="small text-muted mb-0">Optional user-interface preferences such as remembered display choices.</p>' +
                            '</div>' +
                        '</div>' +
                        '<div class="modal-footer">' +
                            '<button type="button" class="btn btn-outline-secondary" data-cookie-save="reject">Reject non-essential</button>' +
                            '<button type="button" class="btn btn-warning" data-cookie-save="save">Save preferences</button>' +
                        '</div>' +
                    '</div>' +
                '</div>' +
            '</div>'
        );
    }

    function ensureBanner() {
        if (document.getElementById("csa-cookie-banner")) {
            return;
        }
        const banner = document.createElement("div");
        banner.id = "csa-cookie-banner";
        banner.className = "fixed-bottom bg-white border-top shadow-lg p-4";
        banner.style.zIndex = "99999";
        banner.innerHTML = bannerHtml();
        document.body.appendChild(banner);

        banner.addEventListener("click", function (event) {
            const target = event.target;
            if (!(target instanceof HTMLElement)) {
                return;
            }
            const action = target.getAttribute("data-cookie-action");
            if (action === "reject") {
                CookieManager.rejectAll();
            } else if (action === "manage") {
                CookieManager.openPreferences();
            } else if (action === "accept") {
                CookieManager.acceptSelectedDefaults();
            }
        });
    }

    function removeBanner() {
        const banner = document.getElementById("csa-cookie-banner");
        if (banner) {
            banner.remove();
        }
    }

    function ensureModal() {
        const consent = loadSavedConsent();
        let modalEl = document.getElementById("csaCookieModal");
        if (modalEl) {
            modalEl.remove();
        }
        const wrapper = document.createElement("div");
        wrapper.innerHTML = modalHtml(consent);
        document.body.appendChild(wrapper.firstChild);
        modalEl = document.getElementById("csaCookieModal");
        modalEl.addEventListener("click", function (event) {
            const target = event.target;
            if (!(target instanceof HTMLElement)) {
                return;
            }
            const mode = target.getAttribute("data-cookie-save");
            if (!mode) {
                return;
            }
            if (mode === "reject") {
                CookieManager.rejectAll();
                const modal = bootstrap.Modal.getInstance(modalEl);
                if (modal) {
                    modal.hide();
                }
                return;
            }
            const nextConsent = {
                categories: {
                    necessary: true,
                    measurement: !!document.getElementById("cookieMeasurement").checked,
                    preferences: !!document.getElementById("cookiePreferences").checked
                }
            };
            CookieManager.save(nextConsent);
            const modal = bootstrap.Modal.getInstance(modalEl);
            if (modal) {
                modal.hide();
            }
        });
        return modalEl;
    }

    window.CookieManager = {
        init: function () {
            const consent = loadSavedConsent();
            applyConsent(consent);
            if (!consent.updated_at) {
                ensureBanner();
            }
        },
        acceptSelectedDefaults: function () {
            this.save({
                categories: {
                    necessary: true,
                    measurement: true,
                    preferences: false
                }
            });
        },
        rejectAll: function () {
            this.save({
                categories: {
                    necessary: true,
                    measurement: false,
                    preferences: false
                }
            });
        },
        save: function (consent) {
            const saved = saveConsent(consent);
            applyConsent(saved);
            removeBanner();
        },
        openPreferences: function () {
            const modalEl = ensureModal();
            const modal = new bootstrap.Modal(modalEl);
            modal.show();
        }
    };

    document.addEventListener("DOMContentLoaded", function () {
        window.CookieManager.init();
    });
})();