import { api } from '../api.js';

export class AdminDashboard extends HTMLElement {
    constructor() {
        super();
        this.users = [];
        this.boundHandleClick = this.handleClick.bind(this);
        this.boundHandleSubmit = this.handleSubmit.bind(this);
    }

    async connectedCallback() {
        this.addEventListener('click', this.boundHandleClick);
        this.addEventListener('submit', this.boundHandleSubmit);
        await this.loadUsers();
    }

    disconnectedCallback() {
        this.removeEventListener('click', this.boundHandleClick);
        this.removeEventListener('submit', this.boundHandleSubmit);
    }

    async loadUsers() {
        try {
            this.users = await api.listUsers();
            this.render();
        } catch (error) {
            console.error('Failed to load users:', error);
            this.innerHTML = '<p class="error-message">Failed to load users. Do you have admin privileges?</p>';
        }
    }

    render() {
        this.innerHTML = `
            <div class="admin-dashboard-container">
                <h2>Admin Dashboard</h2>

                <div class="admin-section">
                    <h3>User Management</h3>
                    <button id="createUserButton" class="button button-primary">Create New User</button>
                    <div class="user-list">
                        ${this.users.map(user => this.renderUser(user)).join('')}
                    </div>
                </div>

                <div id="userModal" class="modal">
                    <div class="modal-content">
                        <span class="close-button">&times;</span>
                        <h3>Edit User</h3>
                        <form id="userForm">
                            <input type="hidden" id="userId">
                            <label for="username">Username:</label>
                            <input type="text" id="username" required>
                            <label for="email">Email:</label>
                            <input type="email" id="email" required>
                            <label for="password">Password (leave blank to keep current):</label>
                            <input type="password" id="password">
                            <label for="isSuperuser">Superuser:</label>
                            <input type="checkbox" id="isSuperuser">
                            <label for="isActive">Active:</label>
                            <input type="checkbox" id="isActive">
                            <label for="is2faEnabled">2FA Enabled:</label>
                            <input type="checkbox" id="is2faEnabled">
                            <label for="storageQuotaBytes">Storage Quota (Bytes):</label>
                            <input type="number" id="storageQuotaBytes">
                            <label for="planType">Plan Type:</label>
                            <input type="text" id="planType">
                            <button type="submit" class="button button-primary">Save</button>
                        </form>
                    </div>
                </div>
            </div>
        `;
    }

    handleClick(e) {
        const target = e.target;

        if (target.id === 'createUserButton') {
            this._showUserModal();
            return;
        }

        if (target.classList.contains('close-button')) {
            this.querySelector('#userModal').style.display = 'none';
            return;
        }

        const userItem = target.closest('.user-item');
        if (userItem) {
            const userId = userItem.dataset.userId;
            if (target.classList.contains('button-danger')) {
                this._deleteUser(userId);
            } else if (target.classList.contains('button')) {
                this._showUserModal(userId);
            }
        }
    }

    handleSubmit(e) {
        if (e.target.id === 'userForm') {
            this._handleUserFormSubmit(e);
        }
    }

    _showUserModal(userId = null) {
        const modal = this.querySelector('#userModal');
        const form = this.querySelector('#userForm');
        form.reset(); // Clear previous form data

        if (userId) {
            const user = this.users.find(u => u.id == userId);
            if (user) {
                this.querySelector('#userId').value = user.id;
                this.querySelector('#username').value = user.username;
                this.querySelector('#email').value = user.email;
                this.querySelector('#isSuperuser').checked = user.is_superuser;
                this.querySelector('#isActive').checked = user.is_active;
                this.querySelector('#is2faEnabled').checked = user.is_2fa_enabled;
                this.querySelector('#storageQuotaBytes').value = user.storage_quota_bytes;
                this.querySelector('#planType').value = user.plan_type;
                this.querySelector('h3').textContent = 'Edit User';
            }
        } else {
            this.querySelector('#userId').value = '';
            this.querySelector('h3').textContent = 'Create New User';
        }
        modal.style.display = 'block';
    }

    async _handleUserFormSubmit(event) {
        event.preventDefault();
        const userId = this.querySelector('#userId').value;
        const userData = {
            username: this.querySelector('#username').value,
            email: this.querySelector('#email').value,
            password: this.querySelector('#password').value || undefined, // Only send if not empty
            is_superuser: this.querySelector('#isSuperuser').checked,
            is_active: this.querySelector('#isActive').checked,
            is_2fa_enabled: this.querySelector('#is2faEnabled').checked,
            storage_quota_bytes: parseInt(this.querySelector('#storageQuotaBytes').value),
            plan_type: this.querySelector('#planType').value,
        };

        try {
            if (userId) {
                await api.updateUser(userId, userData);
            } else {
                await api.createUser(userData);
            }
            this.querySelector('#userModal').style.display = 'none';
            await this.loadUsers(); // Refresh the list
        } catch (error) {
            console.error('Failed to save user:', error);
            alert('Failed to save user: ' + error.message);
        }
    }

    async _deleteUser(userId) {
        if (!confirm('Are you sure you want to delete this user?')) {
            return;
        }
        try {
            await api.deleteUser(userId);
            await this.loadUsers(); // Refresh the list
        } catch (error) {
            console.error('Failed to delete user:', error);
            alert('Failed to delete user: ' + error.message);
        }
    }

    renderUser(user) {
        const formatBytes = (bytes) => {
            if (bytes === 0) return '0 Bytes';
            const k = 1024;
            const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
            const i = Math.floor(Math.log(bytes) / Math.log(k));
            return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
        };

        return `
            <div class="user-item" data-user-id="${user.id}">
                <span>
                    ${user.username} (${user.email}) - Superuser: ${user.is_superuser ? 'Yes' : 'No'} - 2FA: ${user.is_2fa_enabled ? 'Yes' : 'No'} - Active: ${user.is_active ? 'Yes' : 'No'} - Storage: ${formatBytes(user.storage_quota_bytes)} - Plan: ${user.plan_type}
                </span>
                <div class="user-actions">
                    <button class="button button-small">Edit</button>
                    <button class="button button-small button-danger">Delete</button>
                </div>
            </div>
        `;
    }
}

customElements.define('admin-dashboard', AdminDashboard);