(function () {
    'use strict';

    document.addEventListener('DOMContentLoaded', function() {
        var dash = document.getElementById('elp-student-dashboard');
        if (!dash) return;

        var CFG = window.ELP_DASH_CFG || {};
        
        // 1. Handle Avatar Upload (Hover Overlay Method)
        var avatarWrap = document.getElementById('elp-avatar-trigger');
        var avatarInput = document.getElementById('elp-avatar-input');
        var avatarImg = document.getElementById('elp-dash-avatar');

        if (avatarWrap) {
            avatarWrap.addEventListener('click', function() { 
                avatarInput.click(); 
            });
        }

        if (avatarInput) {
            avatarInput.addEventListener('change', function(e) {
                var file = e.target.files[0];
                if (!file) return;

                var reader = new FileReader();
                reader.onload = function(event) {
                    var base64Image = event.target.result;
                    
                    var overlay = document.querySelector('.elp-dash-avatar-overlay');
                    if (overlay) {
                        overlay.innerHTML = '<span>Uploading...</span>';
                        overlay.style.opacity = '1';
                    }

                    fetch(CFG.restUrl + '/dashboard/update-avatar', {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json', 'X-WP-Nonce': CFG.nonce },
                        body: JSON.stringify({ image: base64Image })
                    })
                    .then(r => r.json())
                    .then(res => {
                        if (res.success) {
                            var newUrl = res.url + '?t=' + new Date().getTime();
                            avatarImg.src = newUrl;
                            var headerAvatar = document.querySelector('.elp-header-avatar');
                            if (headerAvatar) headerAvatar.src = newUrl;
                        } else {
                            alert(res.message || 'Upload failed.');
                        }
                        if (overlay) overlay.innerHTML = '<span>Change Photo</span>';
                    })
                    .catch(() => { 
                        alert('Network error.'); 
                        if (overlay) overlay.innerHTML = '<span>Change Photo</span>';
                    });
                };
                reader.readAsDataURL(file);
            });
        }

        // 2. Fetch Real Recent Exam Attempts (Enhanced Error Reporting)
        var examList = document.getElementById('elp-recent-exams');
        if (examList) {
            fetch(CFG.restUrl + '/dashboard/recent-exams', {
                headers: { 'X-WP-Nonce': CFG.nonce }
            })
            .then(r => r.json().then(data => ({ status: r.status, body: data })))
            .then(res => {
                if (res.status >= 400) {
                    var errMsg = res.body.message || 'Failed to load exams.';
                    examList.innerHTML = '<div class="elp-dash-empty">Error: ' + errMsg + '</div>';
                    return;
                }

                if (res.body.exams && res.body.exams.length > 0) {
                    examList.innerHTML = res.body.exams.map(function(exam) {
                        var badgeClass = exam.passed ? 'passed' : 'failed';
                        var badgeText = exam.passed ? 'Passed' : 'Failed';
                        
                        return `
                            <div class="elp-exam-result-item">
                                <div class="elp-exam-info">
                                    <span class="elp-exam-title">${exam.title}</span>
                                    <span class="elp-exam-score">${exam.score} (${exam.percent})</span>
                                </div>
                                <span class="elp-exam-badge ${badgeClass}">${badgeText}</span>
                            </div>
                        `;
                    }).join('');
                } else {
                    examList.innerHTML = '<div class="elp-dash-empty">You haven\'t taken any exams yet. <a href="/">Start one!</a></div>';
                }
            })
            .catch(() => {
                examList.innerHTML = '<div class="elp-dash-empty">Network error loading exams.</div>';
            });
        }

        // 3. Handle Profile Update Form
        var profileForm = document.getElementById('elp-profile-form');
        if (profileForm) {
            profileForm.addEventListener('submit', function(e) {
                e.preventDefault();
                var msgBox = dash.querySelector('.elp-profile-msg');
                var btn = profileForm.querySelector('button[type="submit"]');
                
                msgBox.style.display = 'none';
                btn.textContent = 'Saving...';
                btn.disabled = true;

                var formData = new FormData(profileForm);
                var data = Object.fromEntries(formData);

                fetch(CFG.restUrl + '/dashboard/update-profile', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json', 'X-WP-Nonce': CFG.nonce },
                    body: JSON.stringify(data)
                })
                .then(r => r.json())
                .then(res => {
                    if (res.success) {
                        msgBox.textContent = res.message;
                        msgBox.style.color = '#10b981';
                        msgBox.style.display = 'block';
                    } else {
                        msgBox.textContent = res.message || 'Update failed.';
                        msgBox.style.color = '#dc2626';
                        msgBox.style.display = 'block';
                    }
                    btn.textContent = 'Update Profile';
                    btn.disabled = false;
                    
                    setTimeout(() => { msgBox.style.display = 'none'; }, 3000);
                })
                .catch(() => {
                    msgBox.textContent = 'Network error.';
                    msgBox.style.color = '#dc2626';
                    msgBox.style.display = 'block';
                    btn.textContent = 'Update Profile';
                    btn.disabled = false;
                });
            });
        }

        // 4. Handle "Become Ambassador" Upgrade
        var upgradeBtn = document.getElementById('elp-become-ambassador-btn');
        if (upgradeBtn) {
            upgradeBtn.addEventListener('click', function() {
                upgradeBtn.textContent = 'Verifying...';
                upgradeBtn.disabled = true;

                fetch(CFG.restUrl + '/dashboard/become-ambassador', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json', 'X-WP-Nonce': CFG.nonce }
                })
                .then(r => r.json())
                .then(res => {
                    if (res.success) {
                        window.location.href = res.redirect;
                    } else {
                        if (res.code === 'not_purchased' && res.data && res.data.link) {
                            alert('You must purchase the "Affiliate Marketing" course first. Redirecting you now...');
                            window.location.href = res.data.link;
                        } else {
                            alert(res.message || 'Upgrade failed.');
                            upgradeBtn.textContent = 'Become an Ambassador';
                            upgradeBtn.disabled = false;
                        }
                    }
                })
                .catch(() => {
                    alert('Network error.');
                    upgradeBtn.textContent = 'Become an Ambassador';
                    upgradeBtn.disabled = false;
                });
            });
        }

        // 5. Handle OTP Verification (Email & WhatsApp) using Event Delegation
        dash.addEventListener('click', function(e) {
            var sendBtn = e.target.closest('.elp-send-otp-btn');
            var confirmBtn = e.target.closest('.elp-confirm-otp-btn');

            // Send OTP Click
            if (sendBtn) {
                e.preventDefault();
                var type = sendBtn.getAttribute('data-type');
                var wrap = sendBtn.nextElementSibling;
                
                sendBtn.textContent = 'Sending...';
                sendBtn.disabled = true;

                fetch(CFG.restUrl + '/dashboard/send-otp', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json', 'X-WP-Nonce': CFG.nonce },
                    body: JSON.stringify({ type: type })
                })
                .then(r => r.json())
                .then(res => {
                    if (res.success) {
                        alert(res.message);
                        sendBtn.style.display = 'none';
                        if(wrap) wrap.style.display = 'flex';
                    } else {
                        alert(res.message || 'Failed to send OTP.');
                        sendBtn.textContent = 'Send OTP';
                        sendBtn.disabled = false;
                    }
                })
                .catch(() => { 
                    alert('Network error.'); 
                    sendBtn.textContent = 'Send OTP'; 
                    sendBtn.disabled = false; 
                });
            }

            // Confirm OTP Click
            if (confirmBtn) {
                e.preventDefault();
                var type = confirmBtn.getAttribute('data-type');
                var input = confirmBtn.previousElementSibling;
                var otp = input ? input.value.trim() : '';

                if (!otp) { alert('Please enter the OTP.'); return; }

                confirmBtn.textContent = 'Verifying...';
                confirmBtn.disabled = true;

                fetch(CFG.restUrl + '/dashboard/verify-otp', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json', 'X-WP-Nonce': CFG.nonce },
                    body: JSON.stringify({ type: type, otp: otp })
                })
                .then(r => r.json())
                .then(res => {
                    if (res.success) {
                        alert(res.message);
                        window.location.reload();
                    } else {
                        alert(res.message || 'Invalid OTP.');
                        confirmBtn.textContent = 'Verify';
                        confirmBtn.disabled = false;
                    }
                })
                .catch(() => { 
                    alert('Network error.'); 
                    confirmBtn.textContent = 'Verify'; 
                    confirmBtn.disabled = false; 
                });
            }
        });

        // 6. Handle Copy Referral Link (Ambassador Dashboard)
        var copyBtn = document.getElementById('elp-copy-ref-link');
        var linkInput = document.getElementById('elp-ref-link');

        if (copyBtn && linkInput) {
            copyBtn.addEventListener('click', function() {
                linkInput.select();
                linkInput.setSelectionRange(0, 99999); // For mobile devices

                navigator.clipboard.writeText(linkInput.value).then(function() {
                    var originalText = copyBtn.textContent;
                    copyBtn.textContent = 'Copied!';
                    copyBtn.classList.add('copied');
                    
                    setTimeout(function() {
                        copyBtn.textContent = originalText;
                        copyBtn.classList.remove('copied');
                    }, 2000);
                }).catch(function() {
                    alert('Please copy the link manually.');
                });
            });
        }

    });

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