// Clients Page Module

class ClientsPage {
    constructor() {
        this.clients = [];
        this.init();
    }

    async init() {
        // Load data
        await Promise.all([
            this.loadClients(),
            this.loadClientUsageChart()
        ]);
        
        // Setup event listeners
        this.setupEventListeners();
    }

    async loadClients() {
        try {
            const data = await window.api.get('/clients');
            this.clients = data;
            this.renderClientsTable();
        } catch (error) {
            console.error('Error loading clients:', error);
            window.authManager.showToast('Failed to load clients', 'error');
        }
    }

    renderClientsTable() {
        const tableBody = document.querySelector('#clients-table tbody');
        if (!tableBody) return;
        
        if (this.clients.length === 0) {
            tableBody.innerHTML = '<tr><td colspan="8" class="text-center">No clients configured</td></tr>';
            return;
        }

        tableBody.innerHTML = this.clients.map(client => {
            const statusClass = client.status === 'active' ? 'success' : 'secondary';
            const statusIcon = client.status === 'active' ? 'check-circle' : 'clock';
            const created = luxon.DateTime.fromISO(client.created_at).toFormat('MMM dd, yyyy');
            
            return `
                <tr>
                    <td><span class="badge-client">${client.id}</span></td>
                    <td><strong>${client.name}</strong></td>
                    <td>
                        <code class="token-display">sk-••••${client.id.substring(client.id.length - 4)}</code>
                    </td>
                    <td>${created}</td>
                    <td>${client.last_used ? window.api.formatTimeAgo(client.last_used) : 'Never'}</td>
                    <td>${client.requests_count.toLocaleString()}</td>
                    <td>
                        <span class="status-badge ${statusClass}">
                            <i class="fas fa-${statusIcon}"></i>
                            ${client.status}
                        </span>
                    </td>
                    <td>
                        <div class="action-buttons">
                            <button class="btn-action" title="Edit" onclick="window.clientsPage.editClient('${client.id}')">
                                <i class="fas fa-edit"></i>
                            </button>
                            <button class="btn-action danger" title="Delete" onclick="window.clientsPage.deleteClient('${client.id}')">
                                <i class="fas fa-trash"></i>
                            </button>
                        </div>
                    </td>
                </tr>
            `;
        }).join('');
    }

    async loadClientUsageChart() {
        try {
            const cm = window.chartManager || await window.waitForChartManager();
            if (!cm) { this.showEmptyChart('client-usage-chart', 'Chart system unavailable'); return; }

            const data = await window.api.get('/usage/clients');
            
            if (!data || data.length === 0) {
                this.showEmptyChart('client-usage-chart', 'No client usage data yet');
                return;
            }

            const chartData = {
                labels: data.map(item => item.client_id),
                datasets: [{
                    label: 'Requests',
                    data: data.map(item => item.requests),
                    color: '#6366f1'
                }]
            };
            
            cm.createHorizontalBarChart('client-usage-chart', chartData);
            
        } catch (error) {
            console.error('Error loading client usage chart:', error);
            this.showEmptyChart('client-usage-chart', 'Failed to load usage data');
        }
    }

    showEmptyChart(canvasId, message) {
        const canvas = document.getElementById(canvasId);
        if (!canvas) return;
        const container = canvas.closest('.chart-container');
        if (container) {
            canvas.style.display = 'none';
            let msg = container.querySelector('.empty-chart-msg');
            if (!msg) {
                msg = document.createElement('div');
                msg.className = 'empty-chart-msg';
                msg.style.cssText = 'display:flex;align-items:center;justify-content:center;height:200px;color:var(--fg4);font-size:0.9rem;';
                container.appendChild(msg);
            }
            msg.textContent = message;
        }
    }

    setupEventListeners() {
        const addBtn = document.getElementById('add-client');
        if (addBtn) {
            addBtn.onclick = () => this.showAddClientModal();
        }
    }

    showAddClientModal() {
        const modal = document.createElement('div');
        modal.className = 'modal active';
        modal.innerHTML = `
            <div class="modal-content">
                <div class="modal-header">
                    <h3 class="modal-title">Create New API Client</h3>
                    <button class="modal-close" onclick="this.closest('.modal').remove()">
                        <i class="fas fa-times"></i>
                    </button>
                </div>
                <div class="modal-body">
                    <div class="form-control">
                        <label for="new-client-name">Display Name</label>
                        <input type="text" id="new-client-name" placeholder="e.g. My Coding Assistant" required>
                    </div>
                    <div class="form-control">
                        <label for="new-client-id">Custom ID (Optional)</label>
                        <input type="text" id="new-client-id" placeholder="e.g. personal-app">
                        <small>Leave empty to generate automatically</small>
                    </div>
                </div>
                <div class="modal-footer">
                    <button class="btn btn-secondary" onclick="this.closest('.modal').remove()">Cancel</button>
                    <button class="btn btn-primary" id="confirm-create-client">Create Client</button>
                </div>
            </div>
        `;
        
        document.body.appendChild(modal);
        
        modal.querySelector('#confirm-create-client').onclick = async () => {
            const name = modal.querySelector('#new-client-name').value;
            const id = modal.querySelector('#new-client-id').value;
            
            if (!name) {
                window.authManager.showToast('Name is required', 'error');
                return;
            }

            try {
                await window.api.post('/clients', { name, client_id: id || null });
                window.authManager.showToast(`Client "${name}" created`, 'success');
                modal.remove();
                this.loadClients();
            } catch (error) {
                window.authManager.showToast(error.message, 'error');
            }
        };
    }

    async deleteClient(id) {
        if (!confirm(`Are you sure you want to delete client ${id}? This cannot be undone.`)) return;

        try {
            await window.api.delete(`/clients/${id}`);
            window.authManager.showToast('Client deleted', 'success');
            this.loadClients();
        } catch (error) {
            window.authManager.showToast(error.message, 'error');
        }
    }

    editClient(id) {
        window.authManager.showToast('Edit client not implemented yet', 'info');
    }
}

window.initClients = async () => {
    window.clientsPage = new ClientsPage();
};