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import * as path from 'path';
import {
scanFiles,
calculateChangeAmplification,
getParser,
Severity,
IssueType,
} from '@aiready/core';
import type {
ChangeAmplificationOptions,
ChangeAmplificationReport,
FileChangeAmplificationResult,
ChangeAmplificationIssue,
} from './types';
export async function analyzeChangeAmplification(
options: ChangeAmplificationOptions
): Promise<ChangeAmplificationReport> {
// Use core scanFiles which respects .gitignore recursively
const files = await scanFiles({
...options,
include: options.include || ['**/*.{ts,tsx,js,jsx,py,go}'],
});
// Compute graph metrics: fanIn and fanOut
const dependencyGraph = new Map<string, string[]>(); // key: file, value: imported files
const reverseGraph = new Map<string, string[]>(); // key: file, value: files that import it
// Initialize graph
for (const file of files) {
dependencyGraph.set(file, []);
reverseGraph.set(file, []);
}
// Parse files to build dependency graph
let processed = 0;
for (const file of files) {
processed++;
if (processed % 50 === 0 || processed === files.length) {
options.onProgress?.(
processed,
files.length,
`analyzing dependencies (${processed}/${files.length})`
);
}
try {
const parser = getParser(file);
Iif (!parser) continue;
const content = fs.readFileSync(file, 'utf8');
const parseResult = parser.parse(content, file);
const dependencies = parseResult.imports.map((i) => i.source);
const extensions = ['.ts', '.tsx', '.js', '.jsx'];
for (const dep of dependencies) {
const depDir = path.dirname(file);
let resolvedPath: string | undefined;
if (dep.startsWith('.')) {
// Relative import resolution
const absoluteDepBase = path.resolve(depDir, dep);
// Try extensions
for (const ext of extensions) {
const withExt = absoluteDepBase + ext;
Iif (files.includes(withExt)) {
resolvedPath = withExt;
break;
}
}
// Try /index variations
Eif (!resolvedPath) {
for (const ext of extensions) {
const withIndex = path.join(absoluteDepBase, `index${ext}`);
Iif (files.includes(withIndex)) {
resolvedPath = withIndex;
break;
}
}
}
} else {
// Non-relative import (package or absolute)
// Exact match or matches a file in our set (normalized)
const depWithoutExt = dep.replace(/\.(ts|tsx|js|jsx)$/, '');
resolvedPath = files.find((f) => {
const fWithoutExt = f.replace(/\.(ts|tsx|js|jsx)$/, '');
return (
fWithoutExt === depWithoutExt ||
fWithoutExt.endsWith(`/${depWithoutExt}`)
);
});
}
if (resolvedPath && resolvedPath !== file) {
dependencyGraph.get(file)?.push(resolvedPath);
reverseGraph.get(resolvedPath)?.push(file);
}
}
} catch (err) {
void err;
}
}
const fileMetrics = files.map((file) => {
const fanOut = dependencyGraph.get(file)?.length || 0;
const fanIn = reverseGraph.get(file)?.length || 0;
return { file, fanOut, fanIn };
});
const riskResult = calculateChangeAmplification({ files: fileMetrics });
// Fallback: If score is 0 but we have files, ensure it's at least a baseline if not truly "explosive"
let finalScore = riskResult.score;
Iif (
finalScore === 0 &&
files.length > 0 &&
riskResult.rating !== 'explosive'
) {
finalScore = 10;
}
const results: FileChangeAmplificationResult[] = [];
// Helper for severity mapping
const getLevel = (s: any): number => {
Iif (s === Severity.Critical || s === 'critical') return 4;
Eif (s === Severity.Major || s === 'major') return 3;
if (s === Severity.Minor || s === 'minor') return 2;
if (s === Severity.Info || s === 'info') return 1;
return 0;
};
for (const hotspot of riskResult.hotspots) {
const issues: ChangeAmplificationIssue[] = [];
if (hotspot.amplificationFactor > 20) {
issues.push({
type: IssueType.ChangeAmplification,
severity:
hotspot.amplificationFactor > 40 ? Severity.Critical : Severity.Major,
message: `High change amplification detected (Factor: ${hotspot.amplificationFactor}). Changes here cascade heavily.`,
location: { file: hotspot.file, line: 1 },
suggestion: `Reduce coupling. Fan-out is ${hotspot.fanOut}, Fan-in is ${hotspot.fanIn}.`,
});
}
// We only push results for files that have either high fan-in or fan-out
if (hotspot.amplificationFactor > 5) {
results.push({
fileName: hotspot.file,
issues,
metrics: {
aiSignalClarityScore: 100 - hotspot.amplificationFactor, // Just a rough score
},
});
}
}
return {
summary: {
totalFiles: files.length,
totalIssues: results.reduce((sum, r) => sum + r.issues.length, 0),
criticalIssues: results.reduce(
(sum, r) =>
sum + r.issues.filter((i) => getLevel(i.severity) === 4).length,
0
),
majorIssues: results.reduce(
(sum, r) =>
sum + r.issues.filter((i) => getLevel(i.severity) === 3).length,
0
),
score: finalScore,
rating: riskResult.rating,
recommendations: riskResult.recommendations,
},
results,
};
}
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