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* Usage Stats Panel Component
*
* Platform usage statistics dashboard:
* - User stats (total, new, active)
* - Interview stats
* - Daily activity charts
* - Resume uploads
*/
import React, { useState, useEffect, useCallback } from 'react';
import {
BarChart3, RefreshCw, Users, FileText, MessageSquare,
TrendingUp, Calendar, Activity, Clock, ArrowUp, ArrowDown
} from 'lucide-react';
import { getToken } from '../../services/api';
const API_BASE = import.meta.env.VITE_API_URL || '';
// Stats card component
const StatsCard = ({ icon: Icon, title, value, change, changeType, subtitle }) => {
return (
<div className="usage-stat-card">
<div className="stat-icon">
<Icon size={24} />
</div>
<div className="stat-content">
<span className="stat-value">{value.toLocaleString()}</span>
<span className="stat-title">{title}</span>
{change !== undefined && (
<span className={`stat-change ${changeType}`}>
{changeType === 'up' ? <ArrowUp size={12} /> : <ArrowDown size={12} />}
{change}%
</span>
)}
{subtitle && <span className="stat-subtitle">{subtitle}</span>}
</div>
</div>
);
};
// Simple bar chart component
const SimpleBarChart = ({ data, dataKey, labelKey, title }) => {
if (!data || data.length === 0) return null;
const maxValue = Math.max(...data.map(d => d[dataKey] || 0));
return (
<div className="simple-bar-chart">
<h4>{title}</h4>
<div className="chart-bars">
{data.map((item, idx) => (
<div key={idx} className="bar-container">
<div
className="bar"
style={{
height: `${maxValue > 0 ? (item[dataKey] / maxValue) * 100 : 0}%`
}}
>
<span className="bar-value">{item[dataKey]}</span>
</div>
<span className="bar-label">
{new Date(item[labelKey]).toLocaleDateString('en-US', {
month: 'short',
day: 'numeric'
})}
</span>
</div>
))}
</div>
</div>
);
};
function UsageStatsPanel() {
const [stats, setStats] = useState(null);
const [loading, setLoading] = useState(true);
const [error, setError] = useState(null);
const [days, setDays] = useState(7);
// Fetch stats
const fetchStats = useCallback(async () => {
setLoading(true);
setError(null);
try {
const token = getToken();
const response = await fetch(`${API_BASE}/api/admin/usage-stats?days=${days}`, {
headers: {
'Authorization': `Bearer ${token}`,
'Content-Type': 'application/json'
}
});
if (!response.ok) throw new Error('Failed to fetch usage stats');
const data = await response.json();
if (data.success) {
setStats(data.stats);
}
} catch (err) {
setError(err.message);
} finally {
setLoading(false);
}
}, [days]);
// Initial fetch
useEffect(() => {
fetchStats();
}, [fetchStats]);
if (loading) {
return (
<div className="admin-loading">
<RefreshCw className="spinning" size={40} />
<p>Loading usage statistics...</p>
</div>
);
}
if (error) {
return (
<div className="admin-error">
<p>Error: {error}</p>
<button onClick={fetchStats}>Retry</button>
</div>
);
}
const { users, interviews, resumes, daily } = stats || {};
return (
<div className="usage-stats-panel">
{/* Header */}
<div className="panel-header">
<div className="header-left">
<BarChart3 size={24} />
<h2>Usage Statistics</h2>
</div>
<div className="header-right">
<select
value={days}
onChange={(e) => setDays(Number(e.target.value))}
className="period-selector"
>
<option value={7}>Last 7 days</option>
<option value={14}>Last 14 days</option>
<option value={30}>Last 30 days</option>
</select>
<button className="refresh-btn" onClick={fetchStats} disabled={loading}>
<RefreshCw size={16} className={loading ? 'spinning' : ''} />
Refresh
</button>
</div>
</div>
{/* Main Stats Cards */}
<div className="stats-grid">
<StatsCard
icon={Users}
title="Total Users"
value={users?.total || 0}
subtitle={`${users?.new || 0} new in last ${days} days`}
/>
<StatsCard
icon={Activity}
title="Active Users"
value={users?.active || 0}
subtitle={`Active in last ${days} days`}
/>
<StatsCard
icon={MessageSquare}
title="Total Interviews"
value={interviews?.total || 0}
subtitle={`${interviews?.recent || 0} recent`}
/>
<StatsCard
icon={FileText}
title="Total Resumes"
value={resumes?.total || 0}
/>
</div>
{/* Charts Section */}
<div className="charts-section">
<div className="chart-container">
<SimpleBarChart
data={daily}
dataKey="interviews"
labelKey="date"
title="Daily Interviews"
/>
</div>
<div className="chart-container">
<SimpleBarChart
data={daily}
dataKey="signups"
labelKey="date"
title="Daily Signups"
/>
</div>
<div className="chart-container">
<SimpleBarChart
data={daily}
dataKey="api_requests"
labelKey="date"
title="Daily API Requests"
/>
</div>
</div>
{/* Daily Breakdown Table */}
{daily && daily.length > 0 && (
<div className="daily-breakdown">
<h3><Calendar size={18} /> Daily Breakdown</h3>
<table className="admin-table">
<thead>
<tr>
<th>Date</th>
<th>Interviews</th>
<th>Signups</th>
<th>API Requests</th>
</tr>
</thead>
<tbody>
{daily.map((day, idx) => (
<tr key={idx}>
<td>{new Date(day.date).toLocaleDateString()}</td>
<td>{day.interviews}</td>
<td>{day.signups}</td>
<td>{day.api_requests}</td>
</tr>
))}
</tbody>
</table>
</div>
)}
</div>
);
}
export default UsageStatsPanel;
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