// NextSnap - Admin Panel Logic
'use strict';

const Admin = {
    techUsers: [],
    _activeUser: null,

    async init() {
        this.setupEventListeners();
        await this.loadTechUsers();
    },

    setupEventListeners() {
        document.getElementById('add-tech-user-form').addEventListener('submit', (e) => {
            e.preventDefault();
            this.createTechUser();
        });

        // User detail modal buttons
        document.getElementById('user-modal-close').addEventListener('click', () => this.closeModal('user-modal'));
        document.getElementById('user-modal-toggle-btn').addEventListener('click', () => this._handleToggle());
        document.getElementById('user-modal-pin-btn').addEventListener('click', () => this._handlePinReset());
        document.getElementById('user-modal-resetpw-btn').addEventListener('click', () => this._handleResetNCPassword());
        document.getElementById('user-modal-delete-btn').addEventListener('click', () => this._handleDelete());

        document.getElementById('user-modal-pw-toggle').addEventListener('click', () => this._toggleModalPassword());
        document.getElementById('user-modal-pw-copy').addEventListener('click', () => this._copyModalPassword());

        // PIN modal
        document.getElementById('pin-modal-cancel').addEventListener('click', () => this.closeModal('pin-modal'));
        document.getElementById('confirm-pin-reset').addEventListener('click', () => this._submitPinReset());

        // Confirm modal
        document.getElementById('confirm-modal-cancel').addEventListener('click', () => this.closeModal('confirm-modal'));
    },

    // ── Load & Render ────────────────────────────────────────────────────

    async loadTechUsers() {
        const list = document.getElementById('tech-user-list');
        const loading = document.getElementById('tech-loading-msg');
        const error = document.getElementById('tech-error-msg');

        loading.style.display = 'block';
        error.style.display = 'none';
        list.innerHTML = '';

        try {
            const response = await fetch('/api/admin/tech-users');
            if (!response.ok) {
                const err = await response.json();
                throw new Error(err.error || 'Failed to load tech users');
            }

            const data = await response.json();
            this.techUsers = data.tech_users || [];
            loading.style.display = 'none';

            if (this.techUsers.length === 0) {
                list.innerHTML = '<div class="user-list-empty">No tech users yet</div>';
                return;
            }

            this.techUsers.forEach(user => {
                list.appendChild(this._createUserItem(user));
            });

        } catch (err) {
            console.error('Error loading tech users:', err);
            loading.style.display = 'none';
            error.textContent = err.message;
            error.style.display = 'block';
        }
    },

    _createUserItem(user) {
        const item = document.createElement('div');
        item.className = 'user-list-item';
        const u = this.escapeHtml(user.username);
        const dn = user.display_name && user.display_name !== user.username
            ? this.escapeHtml(user.display_name) : '';

        item.innerHTML = `
            <div class="user-info">
                <span class="user-id">${u}</span>
                ${dn ? `<span class="user-displayname">${dn}</span>` : ''}
            </div>
            <div class="user-right">
                <span class="badge ${user.enabled ? 'badge-success' : 'badge-danger'}">
                    ${user.enabled ? 'Enabled' : 'Disabled'}
                </span>
                <span class="chevron">›</span>
            </div>
        `;
        item.addEventListener('click', () => this.showUserModal(user.username));
        return item;
    },

    // ── User Detail Modal ────────────────────────────────────────────────

    showUserModal(username) {
        const user = this.techUsers.find(u => u.username === username);
        if (!user) return;
        this._activeUser = user;

        document.getElementById('user-modal-title').textContent = user.username;
        const dn = user.display_name && user.display_name !== user.username ? user.display_name : '';
        document.getElementById('user-modal-displayname').textContent = dn;

        // Password
        const pwEl = document.getElementById('user-modal-pw');
        pwEl.dataset.pw = user.nc_password;
        pwEl.dataset.masked = 'true';
        pwEl.textContent = '\u2022'.repeat(12);
        document.getElementById('user-modal-pw-toggle').textContent = 'Show';

        // Status
        const statusEl = document.getElementById('user-modal-status');
        statusEl.textContent = user.enabled ? 'Enabled' : 'Disabled';
        statusEl.className = 'badge ' + (user.enabled ? 'badge-success' : 'badge-danger');

        // Toggle button
        const toggleBtn = document.getElementById('user-modal-toggle-btn');
        if (user.enabled) {
            toggleBtn.textContent = 'Disable User';
            toggleBtn.className = 'btn btn-block btn-warning-outline';
        } else {
            toggleBtn.textContent = 'Enable User';
            toggleBtn.className = 'btn btn-block btn-success-outline';
        }

        document.getElementById('user-modal').style.display = 'flex';
    },

    _toggleModalPassword() {
        const pwEl = document.getElementById('user-modal-pw');
        const btn = document.getElementById('user-modal-pw-toggle');
        if (pwEl.dataset.masked === 'true') {
            pwEl.textContent = pwEl.dataset.pw;
            pwEl.dataset.masked = 'false';
            btn.textContent = 'Hide';
        } else {
            pwEl.textContent = '\u2022'.repeat(12);
            pwEl.dataset.masked = 'true';
            btn.textContent = 'Show';
        }
    },

    _copyModalPassword() {
        const pw = document.getElementById('user-modal-pw').dataset.pw;
        navigator.clipboard.writeText(pw).then(() => {
            this.showToast('Password copied', 'success');
        }).catch(() => {
            this.showToast('Copy failed', 'error');
        });
    },

    // ── Actions from User Modal ──────────────────────────────────────────

    async _handleToggle() {
        const user = this._activeUser;
        if (!user) return;
        const enable = !user.enabled;

        try {
            const response = await fetch(`/api/admin/tech-users/${user.username}`, {
                method: 'PUT',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ enabled: enable })
            });
            if (!response.ok) {
                const err = await response.json();
                throw new Error(err.error || 'Failed');
            }
            this.closeModal('user-modal');
            this.showToast(`User "${user.username}" ${enable ? 'enabled' : 'disabled'}`, 'success');
            this.loadTechUsers();
        } catch (err) {
            this.showToast(err.message, 'error');
        }
    },

    _handlePinReset() {
        const user = this._activeUser;
        if (!user) return;
        this.closeModal('user-modal');
        document.getElementById('pin-modal-username').textContent = user.username;
        document.getElementById('reset-pin').value = '';
        document.getElementById('reset-pin-confirm').value = '';
        document.getElementById('pin-modal-error').style.display = 'none';
        document.getElementById('pin-modal').style.display = 'flex';
    },

    async _submitPinReset() {
        const user = this._activeUser;
        if (!user) return;
        const pin = document.getElementById('reset-pin').value;
        const pinConfirm = document.getElementById('reset-pin-confirm').value;
        const errorEl = document.getElementById('pin-modal-error');
        errorEl.style.display = 'none';

        if (!pin || pin.length < 4) {
            errorEl.textContent = 'PIN must be at least 4 digits';
            errorEl.style.display = 'block';
            return;
        }
        if (pin !== pinConfirm) {
            errorEl.textContent = 'PINs do not match';
            errorEl.style.display = 'block';
            return;
        }

        try {
            const response = await fetch(`/api/admin/tech-users/${user.username}`, {
                method: 'PUT',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ pin })
            });
            if (!response.ok) {
                const err = await response.json();
                throw new Error(err.error || 'Failed to reset PIN');
            }
            this.closeModal('pin-modal');
            this.showToast(`PIN reset for "${user.username}"`, 'success');
        } catch (err) {
            errorEl.textContent = err.message;
            errorEl.style.display = 'block';
        }
    },

    _handleResetNCPassword() {
        const user = this._activeUser;
        if (!user) return;
        this.closeModal('user-modal');
        this._showConfirm(
            'Reset NC Password?',
            `Generate a new Nextcloud password for "${user.username}"? They will need the new password to sync.`,
            async () => {
                try {
                    const response = await fetch(`/api/admin/tech-users/${user.username}/reset-password`, {
                        method: 'POST'
                    });
                    const result = await response.json();
                    if (!response.ok) throw new Error(result.error || 'Failed');
                    this.closeModal('confirm-modal');
                    this.showToast(`NC password reset for "${user.username}"`, 'success');
                    this.loadTechUsers();
                } catch (err) {
                    document.getElementById('confirm-modal-error').textContent = err.message;
                    document.getElementById('confirm-modal-error').style.display = 'block';
                }
            }
        );
    },

    _handleDelete() {
        const user = this._activeUser;
        if (!user) return;
        this.closeModal('user-modal');
        this._showConfirm(
            'Delete Tech User?',
            `Delete "${user.username}"? Their Nextcloud account will be disabled.`,
            async () => {
                try {
                    const response = await fetch(`/api/admin/tech-users/${user.username}`, {
                        method: 'DELETE'
                    });
                    if (!response.ok) {
                        const err = await response.json();
                        throw new Error(err.error || 'Failed');
                    }
                    this.closeModal('confirm-modal');
                    this.showToast(`Tech user "${user.username}" deleted`, 'success');
                    this.loadTechUsers();
                } catch (err) {
                    document.getElementById('confirm-modal-error').textContent = err.message;
                    document.getElementById('confirm-modal-error').style.display = 'block';
                }
            }
        );
    },

    // ── Generic Confirm Modal ────────────────────────────────────────────

    _showConfirm(title, message, onConfirm) {
        document.getElementById('confirm-modal-title').textContent = title;
        document.getElementById('confirm-modal-msg').textContent = message;
        document.getElementById('confirm-modal-error').style.display = 'none';
        document.getElementById('confirm-modal-ok').onclick = onConfirm;
        document.getElementById('confirm-modal').style.display = 'flex';
    },

    // ── Create Tech User ─────────────────────────────────────────────────

    async createTechUser() {
        const submitBtn = document.getElementById('tech-submit-btn');
        const formError = document.getElementById('tech-form-error');
        const formSuccess = document.getElementById('tech-form-success');

        const username = document.getElementById('new-tech-username').value.trim();
        const displayName = document.getElementById('new-tech-displayname').value.trim();
        const pin = document.getElementById('new-tech-pin').value;
        const pinConfirm = document.getElementById('new-tech-pin-confirm').value;

        formError.style.display = 'none';
        formSuccess.style.display = 'none';

        if (!username || !pin) {
            formError.textContent = 'Username and PIN are required';
            formError.style.display = 'block';
            return;
        }
        if (pin.length < 4) {
            formError.textContent = 'PIN must be at least 4 digits';
            formError.style.display = 'block';
            return;
        }
        if (pin !== pinConfirm) {
            formError.textContent = 'PINs do not match';
            formError.style.display = 'block';
            return;
        }

        submitBtn.disabled = true;
        submitBtn.textContent = 'Creating...';

        try {
            const response = await fetch('/api/admin/tech-users', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ username, display_name: displayName, pin })
            });

            const result = await response.json();
            if (!response.ok) throw new Error(result.error || 'Failed to create tech user');

            formSuccess.textContent = `Tech user "${username}" created!`;
            formSuccess.style.display = 'block';

            document.getElementById('add-tech-user-form').reset();
            this.loadTechUsers();

        } catch (err) {
            console.error('Error creating tech user:', err);
            formError.textContent = err.message;
            formError.style.display = 'block';
        } finally {
            submitBtn.disabled = false;
            submitBtn.textContent = 'Create Tech User';
        }
    },

    // ── Helpers ──────────────────────────────────────────────────────────

    closeModal(id) {
        document.getElementById(id).style.display = 'none';
    },

    showToast(message, type) {
        const toast = document.getElementById('toast');
        toast.textContent = message;
        toast.className = `toast ${type}`;
        toast.style.display = 'block';
        setTimeout(() => { toast.style.display = 'none'; }, 3000);
    },

    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }
};

window.Admin = Admin;