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import React, { useMemo } from 'react';
import {
Line,
XAxis,
YAxis,
CartesianGrid,
Tooltip,
ReferenceLine,
ResponsiveContainer,
Area,
ComposedChart,
} from 'recharts';
/**
* Data point for trend chart
*/
export interface TrendDataPoint {
timestamp: string;
value: number;
status: string;
}
/**
* Summary statistics
*/
export interface TrendSummary {
avgValue: number;
minValue: number;
maxValue: number;
breachCount: number;
uptimePercentage: number;
dataPointCount: number;
}
export interface SLOTrendProps {
/** SLO name for display */
sloName: string;
/** Target percentage */
target: number;
/** Trend data points */
data: TrendDataPoint[];
/** Summary statistics */
summary?: TrendSummary;
/** Time range label */
periodLabel?: string;
/** Show area fill under the line */
showArea?: boolean;
/** Chart height */
height?: number;
/** Loading state */
isLoading?: boolean;
/** Compact mode (hides summary) */
compact?: boolean;
/** Additional CSS classes */
className?: string;
}
/**
* Format timestamp for display
*/
function formatTimestamp(timestamp: string, showTime: boolean = true): string {
const date = new Date(timestamp);
if (showTime) {
return date.toLocaleString('en-US', {
month: 'short',
day: 'numeric',
hour: '2-digit',
minute: '2-digit',
});
}
return date.toLocaleDateString('en-US', {
month: 'short',
day: 'numeric',
});
}
/**
* Get status color
*/
function getStatusColor(status: string): string {
switch (status) {
case 'healthy':
return '#22c55e'; // green-500
case 'warning':
return '#eab308'; // yellow-500
case 'critical':
return '#ef4444'; // red-500
default:
return '#6b7280'; // gray-500
}
}
/**
* Custom tooltip component
*/
function CustomTooltip({
active,
payload,
label,
target,
}: {
active?: boolean;
payload?: Array<{ value: number; payload: TrendDataPoint }>;
label?: string;
target: number;
}) {
if (!active || !payload || !payload.length) return null;
const data = payload[0];
const value = data.value;
const status = data.payload.status;
const isMeetingTarget = value >= target;
return (
<div className="bg-white dark:bg-gray-800 p-3 rounded-lg shadow-lg border border-gray-200 dark:border-gray-700">
<p className="text-xs text-gray-500 dark:text-gray-400 mb-1">
{formatTimestamp(label || '')}
</p>
<p className="text-lg font-bold" style={{ color: getStatusColor(status) }}>
{value.toFixed(2)}%
</p>
<p className="text-xs text-gray-500 dark:text-gray-400">
Target: {target}%
{isMeetingTarget ? (
<span className="ml-2 text-green-500">Meeting target</span>
) : (
<span className="ml-2 text-red-500">Below target</span>
)}
</p>
</div>
);
}
/**
* SLOTrend Component
*
* Displays historical SLO performance as a line chart with target reference line.
*/
export function SLOTrend({
sloName,
target,
data,
summary,
periodLabel = 'Last 7 Days',
showArea = true,
height = 300,
isLoading = false,
compact = false,
className = '',
}: SLOTrendProps) {
// Prepare chart data
const chartData = useMemo(() => {
return data.map((point) => ({
...point,
formattedTime: formatTimestamp(point.timestamp, data.length <= 48),
}));
}, [data]);
// Calculate y-axis domain
const yDomain = useMemo(() => {
if (data.length === 0) return [95, 100];
const values = data.map((d) => d.value);
const min = Math.min(...values, target);
const max = Math.max(...values);
// Round down min and up max to nice values
const roundedMin = Math.floor(min - 1);
const roundedMax = Math.ceil(max + 0.5);
return [Math.max(0, roundedMin), Math.min(100, roundedMax)];
}, [data, target]);
if (isLoading) {
return (
<div
className={`bg-white dark:bg-gray-800 rounded-lg shadow p-4 ${className}`}
data-testid="slo-trend"
>
<div className="h-6 w-48 bg-gray-200 dark:bg-gray-700 rounded animate-pulse mb-4" />
<div
className="bg-gray-200 dark:bg-gray-700 rounded animate-pulse"
style={{ height: `${height}px` }}
/>
</div>
);
}
return (
<div
className={`bg-white dark:bg-gray-800 rounded-lg shadow ${className}`}
data-testid="slo-trend"
>
{/* Header */}
<div className="p-4 border-b border-gray-200 dark:border-gray-700">
<div className="flex items-center justify-between">
<div>
<h3 className="text-lg font-semibold text-gray-900 dark:text-white">
{sloName}
</h3>
<p className="text-sm text-gray-500 dark:text-gray-400">
Target: {target}% | {periodLabel}
</p>
</div>
{summary && !compact && (
<div className="text-right">
<p className="text-2xl font-bold text-gray-900 dark:text-white">
{summary.avgValue.toFixed(2)}%
</p>
<p className="text-xs text-gray-500 dark:text-gray-400">Average</p>
</div>
)}
</div>
</div>
{/* Chart */}
<div className="p-4" style={{ height: `${height}px` }}>
{data.length === 0 ? (
<div className="flex items-center justify-center h-full text-gray-500 dark:text-gray-400">
No historical data available
</div>
) : (
<ResponsiveContainer width="100%" height="100%">
<ComposedChart data={chartData} margin={{ top: 10, right: 10, left: 0, bottom: 0 }}>
<CartesianGrid strokeDasharray="3 3" className="stroke-gray-200 dark:stroke-gray-700" />
<XAxis
dataKey="formattedTime"
tick={{ fontSize: 11 }}
tickLine={false}
axisLine={false}
className="text-gray-500 dark:text-gray-400"
interval="preserveStartEnd"
/>
<YAxis
domain={yDomain}
tick={{ fontSize: 11 }}
tickLine={false}
axisLine={false}
className="text-gray-500 dark:text-gray-400"
tickFormatter={(v) => `${v}%`}
/>
<Tooltip content={<CustomTooltip target={target} />} />
<ReferenceLine
y={target}
stroke="#ef4444"
strokeDasharray="5 5"
strokeWidth={2}
label={{
value: `Target: ${target}%`,
position: 'right',
fontSize: 11,
fill: '#ef4444',
}}
/>
{showArea && (
<Area
type="monotone"
dataKey="value"
fill="url(#colorGradient)"
stroke="none"
/>
)}
<Line
type="monotone"
dataKey="value"
stroke="#3b82f6"
strokeWidth={2}
dot={false}
activeDot={{ r: 6, fill: '#3b82f6' }}
/>
<defs>
<linearGradient id="colorGradient" x1="0" y1="0" x2="0" y2="1">
<stop offset="5%" stopColor="#3b82f6" stopOpacity={0.3} />
<stop offset="95%" stopColor="#3b82f6" stopOpacity={0} />
</linearGradient>
</defs>
</ComposedChart>
</ResponsiveContainer>
)}
</div>
{/* Summary stats */}
{summary && !compact && (
<div className="px-4 pb-4">
<div className="grid grid-cols-4 gap-4 p-3 bg-gray-50 dark:bg-gray-900/50 rounded-lg">
<div>
<p className="text-xs text-gray-500 dark:text-gray-400">Min</p>
<p
className={`text-lg font-semibold ${
summary.minValue >= target
? 'text-green-600 dark:text-green-400'
: 'text-red-600 dark:text-red-400'
}`}
>
{summary.minValue.toFixed(2)}%
</p>
</div>
<div>
<p className="text-xs text-gray-500 dark:text-gray-400">Max</p>
<p className="text-lg font-semibold text-green-600 dark:text-green-400">
{summary.maxValue.toFixed(2)}%
</p>
</div>
<div>
<p className="text-xs text-gray-500 dark:text-gray-400">Breaches</p>
<p
className={`text-lg font-semibold ${
summary.breachCount === 0
? 'text-green-600 dark:text-green-400'
: 'text-red-600 dark:text-red-400'
}`}
>
{summary.breachCount}
</p>
</div>
<div>
<p className="text-xs text-gray-500 dark:text-gray-400">SLO Compliance</p>
<p
className={`text-lg font-semibold ${
summary.uptimePercentage >= 99
? 'text-green-600 dark:text-green-400'
: summary.uptimePercentage >= 95
? 'text-yellow-600 dark:text-yellow-400'
: 'text-red-600 dark:text-red-400'
}`}
>
{summary.uptimePercentage.toFixed(1)}%
</p>
</div>
</div>
</div>
)}
</div>
);
}
export default SLOTrend;
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