(function () {
    'use strict';

    var root = document.querySelector('.task-cert-admin-monitoring');
    if (!root) { return; }

    var csrfToken = root.getAttribute('data-csrf-token') || '';
    var resetAssignmentUrl = root.getAttribute('data-reset-assignment-url') || '';
    var resetCycleUrl = root.getAttribute('data-reset-cycle-url') || '';
    var approvalUrl = root.getAttribute('data-approval-url') || '';
    var taskId = parseInt(root.getAttribute('data-task-id') || '0', 10);

    // ── Toast ─────────────────────────────────────────────────────

    var toastContainer = document.getElementById('task-cert-toast-container');

    function showToast(message, type) {
        if (!toastContainer) { return; }
        var cls = type === 'error' ? 'task-cert-error' : 'task-cert-success';
        var toast = document.createElement('div');
        toast.className = 'task-cert-toast ' + cls;
        toast.textContent = String(message || '');
        toast.addEventListener('click', function () {
            removeToast(toast);
        });
        toastContainer.appendChild(toast);

        // Trigger fade-in on next frame
        requestAnimationFrame(function () {
            toast.classList.add('is-visible');
        });

        var autoHideMs = type === 'error' ? 7000 : 4000;
        setTimeout(function () {
            removeToast(toast);
        }, autoHideMs);
    }

    function removeToast(toast) {
        if (!toast || !toast.parentNode) { return; }
        toast.classList.remove('is-visible');
        setTimeout(function () {
            if (toast.parentNode) {
                toast.parentNode.removeChild(toast);
            }
        }, 250);
    }

    // Expose globally so other admin scripts (mark_completed) can reuse
    window.TaskCertAdminActions = window.TaskCertAdminActions || {};
    window.TaskCertAdminActions.showToast = showToast;

    // ── Fetch-Helper ──────────────────────────────────────────────

    function postJson(url, body) {
        return fetch(url, {
            method: 'POST',
            credentials: 'same-origin',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(body)
        }).then(function (res) {
            return res.json().then(function (data) {
                return { ok: res.ok, status: res.status, data: data };
            }).catch(function () {
                return { ok: false, status: res.status, data: { success: false, error: 'Ungültige Server-Antwort' } };
            });
        });
    }

    function reloadWithDelay() {
        setTimeout(function () {
            location.reload();
        }, 800);
    }

    function setButtonBusy(btn, busy, busyLabel) {
        if (!btn) { return; }
        if (busy) {
            btn._originalLabel = btn.textContent;
            btn.textContent = busyLabel || 'Wird verarbeitet...';
            btn.disabled = true;
        } else {
            if (btn._originalLabel) { btn.textContent = btn._originalLabel; }
            btn.disabled = false;
        }
    }

    // ── Action: Reset Assignment ──────────────────────────────────

    function handleResetAssignment(btn) {
        var assignmentId = parseInt(btn.getAttribute('data-assignment-id') || '0', 10);
        if (!assignmentId || !taskId || !resetAssignmentUrl) { return; }

        if (!window.confirm('Einreichungen und Zertifikat für diesen Zeitraum wirklich zurücksetzen?')) {
            return;
        }

        setButtonBusy(btn, true, 'Wird zurückgesetzt...');

        postJson(resetAssignmentUrl, {
            csrf_token: csrfToken,
            task_id: taskId,
            assignment_id: assignmentId
        }).then(function (result) {
            if (result.data && result.data.success) {
                showToast('Zeitraum wurde zurückgesetzt.', 'success');
                reloadWithDelay();
            } else {
                setButtonBusy(btn, false);
                showToast((result.data && result.data.error) || 'Fehler beim Zurücksetzen.', 'error');
            }
        }).catch(function (err) {
            setButtonBusy(btn, false);
            showToast('Netzwerkfehler: ' + (err && err.message ? err.message : 'Unbekannt'), 'error');
        });
    }

    // ── Action: Reset Cycle ───────────────────────────────────────

    function handleResetCycle(btn) {
        var btnTaskId = parseInt(btn.getAttribute('data-task-id') || '0', 10) || taskId;
        if (!btnTaskId || !resetCycleUrl) { return; }

        if (!window.confirm('Wirklich ALLE Einreichungen und Zertifikate im aktuellen Zyklus zurücksetzen? Diese Aktion betrifft alle Mitarbeiter in diesem Zeitraum.')) {
            return;
        }

        setButtonBusy(btn, true, 'Wird zurückgesetzt...');

        postJson(resetCycleUrl, {
            csrf_token: csrfToken,
            task_id: btnTaskId
        }).then(function (result) {
            if (result.data && result.data.success) {
                var stats = (result.data && result.data.stats) || {};
                var n = parseInt(stats.assignment_count || 0, 10);
                showToast('Zyklus wurde zurückgesetzt (' + n + ' Zuweisungen).', 'success');
                reloadWithDelay();
            } else {
                setButtonBusy(btn, false);
                showToast((result.data && result.data.error) || 'Fehler beim Zurücksetzen.', 'error');
            }
        }).catch(function (err) {
            setButtonBusy(btn, false);
            showToast('Netzwerkfehler: ' + (err && err.message ? err.message : 'Unbekannt'), 'error');
        });
    }

    // ── Action: Approval ──────────────────────────────────────────

    function handleApproval(btn) {
        var wrapper = btn.closest('.task-cert-inline-approval-form');
        if (!wrapper) { return; }

        var submissionId = parseInt(wrapper.getAttribute('data-submission-id') || '0', 10);
        var decision = btn.getAttribute('data-decision') || '';
        if (!submissionId || !decision || !approvalUrl) { return; }

        var noteEl = wrapper.querySelector('.task-cert-approval-note');
        var note = noteEl ? noteEl.value.trim() : '';

        if (decision === 'reject' && !window.confirm('Einreichung wirklich ablehnen?')) {
            return;
        }

        // Disable both buttons in this row
        var siblings = wrapper.querySelectorAll('.task-cert-btn-approval');
        for (var i = 0; i < siblings.length; i++) {
            siblings[i].disabled = true;
        }
        setButtonBusy(btn, true, decision === 'approve' ? 'Freigabe...' : 'Ablehnen...');

        postJson(approvalUrl, {
            csrf_token: csrfToken,
            submission_id: submissionId,
            decision: decision,
            note: note
        }).then(function (result) {
            if (result.data && result.data.success) {
                var msg = decision === 'approve' ? 'Einreichung freigegeben.' : 'Einreichung abgelehnt.';
                showToast(msg, 'success');
                reloadWithDelay();
            } else {
                for (var j = 0; j < siblings.length; j++) { siblings[j].disabled = false; }
                setButtonBusy(btn, false);
                showToast((result.data && result.data.error) || 'Fehler bei der Bearbeitung.', 'error');
            }
        }).catch(function (err) {
            for (var k = 0; k < siblings.length; k++) { siblings[k].disabled = false; }
            setButtonBusy(btn, false);
            showToast('Netzwerkfehler: ' + (err && err.message ? err.message : 'Unbekannt'), 'error');
        });
    }

    // ── Event-Delegation ──────────────────────────────────────────

    document.addEventListener('click', function (e) {
        var resetAssignBtn = e.target.closest('.task-cert-btn-reset-assignment');
        if (resetAssignBtn) {
            e.preventDefault();
            handleResetAssignment(resetAssignBtn);
            return;
        }

        var resetCycleBtn = e.target.closest('.task-cert-btn-reset-cycle');
        if (resetCycleBtn) {
            e.preventDefault();
            handleResetCycle(resetCycleBtn);
            return;
        }

        var approvalBtn = e.target.closest('.task-cert-btn-approval');
        if (approvalBtn) {
            e.preventDefault();
            handleApproval(approvalBtn);
            return;
        }
    });
})();