// profile customization logic
async function loadProfile() {
    try {
        const res = await fetch(`${API_URL}/profile`, {
            headers: { 'Authorization': `Bearer ${token}` }
        });
        if (res.ok) {
            const user = await res.json();
            // populate form fields
            profileAvatarInput.value = '';
            profileDescInput.value = user.description || '';
            profilePronounsInput.value = user.pronouns || '';
            // show preview if avatar exists
            setAvatarPreview(user.avatar_url);
            // also update header avatar if present
            updateHeaderAvatar(user.avatar_url);
        }
    } catch (e) {
        console.error('error loading profile', e);
    }
}

function displayProfileModal() {
    profileModal.style.display = 'flex';
    loadProfile();
}

async function saveProfile() {
    const form = new FormData();
    const file = profileAvatarInput.files && profileAvatarInput.files[0];
    if (file) {
        form.append('avatar_file', file);
    }
    form.append('description', profileDescInput.value.trim());
    form.append('pronouns', profilePronounsInput.value.trim());

    try {
        const res = await fetch(`${API_URL}/profile`, {
            method: 'POST',
            headers: {
                'Authorization': `Bearer ${token}`
            },
            body: form
        });
        if (res.ok) {
            const updated = await res.json();
            updateHeaderAvatar(updated.avatar_url);
            profileModal.style.display = 'none';
        }
    } catch (e) {
        console.error('error saving profile', e);
    }
}

function updateHeaderAvatar(url) {
    if (url) {
        let img = document.querySelector('.header-avatar');
        if (!img) {
            img = document.createElement('img');
            img.className = 'header-avatar';
            if (currentUserDisplay) {
                currentUserDisplay.prepend(img);
            }
        }
        img.src = url;
        img.alt = 'avatar';
        img.style.display = 'block';
        img.onerror = function() {
            this.style.display = 'none';
        };
    }
}

// profile modal preview
function setAvatarPreview(url) {
    let prev = document.getElementById('avatar-preview');
    if (!prev) {
        prev = document.createElement('img');
        prev.id = 'avatar-preview';
        prev.style.maxWidth = '100px';
        prev.style.maxHeight = '100px';
        prev.style.borderRadius = '50%';
        prev.style.objectFit = 'cover';
        if (profileAvatarInput && profileAvatarInput.parentNode) {
            profileAvatarInput.parentNode.insertBefore(prev, profileAvatarInput.nextSibling);
        }
    }

    if (url) {
        prev.src = url;
        prev.style.display = 'block';
        prev.onerror = function() {
            this.style.display = 'none';
        };
    } else {
        prev.style.display = 'none';
    }
}

// View own profile
async function viewOwnProfile() {
    if (!userProfileModal) return;
    currentViewingUserId = userId; // Set to current user

    try {
        const res = await fetch(`${API_URL}/profile`, {
            headers: { 'Authorization': `Bearer ${token}` }
        });

        if (res.ok) {
            const user = await res.json();

            // Set user info
            userProfileUsername.textContent = user.username;

            if (user.avatar_url && user.avatar_url.trim() !== '') {
                userProfileAvatar.src = user.avatar_url;
                userProfileAvatar.style.display = 'block';
            } else {
                userProfileAvatar.style.display = 'none';
            }

            if (user.pronouns && user.pronouns.trim() !== '') {
                userProfilePronouns.textContent = user.pronouns;
                userProfilePronouns.style.display = 'block';
            } else {
                userProfilePronouns.style.display = 'none';
            }

            if (user.description && user.description.trim() !== '') {
                userProfileDescription.textContent = user.description;
            } else {
                userProfileDescription.textContent = '';
            }

            // Show "Edit Profile" button instead of "Add Friend"
            userProfileAddFriendBtn.textContent = 'Edit Profile';
            userProfileAddFriendBtn.classList.remove('added');
            userProfileAddFriendBtn.disabled = false;

            // Remove old event listeners and add new one
            const newBtn = userProfileAddFriendBtn.cloneNode(true);
            userProfileAddFriendBtn.parentNode.replaceChild(newBtn, userProfileAddFriendBtn);
            userProfileAddFriendBtn = newBtn;

            // Add click handler for edit profile
            userProfileAddFriendBtn.addEventListener('click', () => {
                userProfileModal.style.display = 'none';
                displayProfileModal();
            });

            userProfileModal.style.display = 'flex';
        }
    } catch (error) {
        console.error('Error loading own profile:', error);
    }
}

// User profile preview modal functionality
let currentViewingUserId = null;

async function showUserProfile(userId) {
    if (!userProfileModal) return;
    currentViewingUserId = userId;

    try {
        const res = await fetch(`${API_URL}/users/${userId}`, {
            headers: { 'Authorization': `Bearer ${token}` }
        });

        if (res.ok) {
            const user = await res.json();

            // Set user info
            userProfileUsername.textContent = user.username;

            // Handle avatar - check if URL exists and is not empty
            if (user.avatar_url && user.avatar_url.trim() !== '') {
                userProfileAvatar.src = user.avatar_url;
                userProfileAvatar.style.display = 'block';
                userProfileAvatar.onerror = function() {
                    // Fallback if image fails to load
                    this.style.display = 'none';
                };
            } else {
                // Hide avatar if no URL
                userProfileAvatar.style.display = 'none';
            }

            // Handle pronouns
            if (user.pronouns && user.pronouns.trim() !== '') {
                userProfilePronouns.textContent = user.pronouns;
                userProfilePronouns.style.display = 'block';
            } else {
                userProfilePronouns.style.display = 'none';
            }

            // Handle description
            if (user.description && user.description.trim() !== '') {
                userProfileDescription.textContent = user.description;
            } else {
                userProfileDescription.textContent = '';
            }

            // Check if already friends
            const isFriend = friends.some(f => f.id === user.id);
            const isSelf = String(user.id) === String(userId);

            if (isFriend) {
                userProfileAddFriendBtn.textContent = 'Friends';
                userProfileAddFriendBtn.classList.add('added');
                userProfileAddFriendBtn.disabled = true;
            } else if (isSelf) {
                userProfileAddFriendBtn.textContent = 'Your Profile';
                userProfileAddFriendBtn.classList.add('added');
                userProfileAddFriendBtn.disabled = true;
            } else {
                userProfileAddFriendBtn.textContent = 'Add Friend';
                userProfileAddFriendBtn.classList.remove('added');
                userProfileAddFriendBtn.disabled = false;
            }

            userProfileModal.style.display = 'flex';
        }
    } catch (error) {
        console.error('Error loading user profile:', error);
    }
}

async function addFriendFromProfile() {
    if (!currentViewingUserId || userProfileAddFriendBtn.disabled) return;

    // Get username from the display
    const username = userProfileUsername.textContent;

    try {
        const res = await fetch(`${API_URL}/friend-request`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Authorization': `Bearer ${token}`
            },
            body: JSON.stringify({ username: username })
        });

        if (res.ok) {
            userProfileAddFriendBtn.textContent = 'Request Sent';
            userProfileAddFriendBtn.classList.add('added');
            userProfileAddFriendBtn.disabled = true;
        } else {
            const data = await res.json();
            alert(data.error || 'Error sending friend request');
        }
    } catch (error) {
        console.error('Error adding friend:', error);
    }
}

function initUserProfileListeners() {
    // Close button
    if (userProfileCloseBtn) {
        userProfileCloseBtn.addEventListener('click', () => {
            if (userProfileModal) userProfileModal.style.display = 'none';
        });
    }

    // Close on background click
    if (userProfileModal) {
        userProfileModal.addEventListener('click', (e) => {
            if (e.target === userProfileModal) {
                userProfileModal.style.display = 'none';
            }
        });
    }

    // Add friend button
    if (userProfileAddFriendBtn) {
        userProfileAddFriendBtn.addEventListener('click', addFriendFromProfile);
    }
}

// Make message usernames clickable to view profile
function initMessageUsernameClickHandlers() {
    // This will be called after messages are rendered
    document.addEventListener('click', (e) => {
        const authorSpan = e.target.closest('.message-author');
        if (authorSpan && !authorSpan.classList.contains('own-author')) {
            const messageEl = authorSpan.closest('.message');
            if (messageEl) {
                const senderId = messageEl.getAttribute('data-sender-id');
                if (senderId && String(senderId) !== String(userId)) {
                    showUserProfile(senderId);
                }
            }
        }
    });
}

function initProfileListeners() {
    // Initialize user profile modal listeners
    initUserProfileListeners();
    initMessageUsernameClickHandlers();

    // View own profile button
    const viewProfileBtn = document.getElementById('view-profile-btn');
    if (viewProfileBtn) {
        try {
            viewProfileBtn.addEventListener('click', viewOwnProfile);
        } catch(e) {
            console.error('viewProfileBtn attach', e);
        }
    } else if (profileBtn) {
        // Fallback to old button
        try {
            profileBtn.addEventListener('click', viewOwnProfile);
        } catch(e) {
            console.error('profileBtn attach', e);
        }
    }

    if (profileCloseBtn) {
        try {
            profileCloseBtn.addEventListener('click', () => {
                profileModal.style.display = 'none';
            });
        } catch(e) {
            console.error('profileCloseBtn attach', e);
        }
    }

    if (profileModal) {
        try {
            profileModal.addEventListener('click', (e) => {
                if (e.target === profileModal) profileModal.style.display = 'none';
            });
        } catch(e) {
            console.error('profileModal attach', e);
        }
    }

    if (profileSaveBtn) {
        try {
            profileSaveBtn.addEventListener('click', saveProfile);
        } catch(e) {
            console.error('profileSaveBtn attach', e);
        }
    }

    // watch file input changes for preview
    if (profileAvatarInput) {
        profileAvatarInput.addEventListener('change', () => {
            const file = profileAvatarInput.files[0];
            if (file) {
                const reader = new FileReader();
                reader.onload = e => setAvatarPreview(e.target.result);
                reader.readAsDataURL(file);
            }
        });
    }
}