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import { isMatch } from 'super-regex';
import { ParsedStream, UserData } from '../db/schemas';
import { createLogger, FeatureControl, getTimeTakenSincePoint } from '../utils';
import {
formRegexFromKeywords,
compileRegex,
parseRegex,
} from '../utils/regex';
import { StreamSelector } from '../parser/streamExpression';
const logger = createLogger('precomputer');
class StreamPrecomputer {
private userData: UserData;
constructor(userData: UserData) {
this.userData = userData;
}
public async precompute(streams: ParsedStream[]) {
const preferredRegexPatterns =
FeatureControl.isRegexAllowed(this.userData) &&
this.userData.preferredRegexPatterns
? await Promise.all(
this.userData.preferredRegexPatterns.map(async (pattern) => {
return {
name: pattern.name,
negate: parseRegex(pattern.pattern).flags.includes('n'),
pattern: await compileRegex(pattern.pattern),
};
})
)
: undefined;
const preferredKeywordsPatterns = this.userData.preferredKeywords
? await formRegexFromKeywords(this.userData.preferredKeywords)
: undefined;
if (!preferredRegexPatterns && !preferredKeywordsPatterns) {
return;
}
const start = Date.now();
if (preferredKeywordsPatterns) {
streams.forEach((stream) => {
stream.keywordMatched =
isMatch(preferredKeywordsPatterns, stream.filename || '') ||
isMatch(preferredKeywordsPatterns, stream.folderName || '') ||
isMatch(
preferredKeywordsPatterns,
stream.parsedFile?.releaseGroup || ''
) ||
isMatch(preferredKeywordsPatterns, stream.indexer || '');
});
}
const determineMatch = (
stream: ParsedStream,
regexPattern: { pattern: RegExp; negate: boolean },
attribute?: string
) => {
return attribute ? isMatch(regexPattern.pattern, attribute) : false;
};
if (preferredRegexPatterns) {
streams.forEach((stream) => {
for (let i = 0; i < preferredRegexPatterns.length; i++) {
// if negate, then the pattern must not match any of the attributes
// and if the attribute is undefined, then we can consider that as a non-match so true
const regexPattern = preferredRegexPatterns[i];
const filenameMatch = determineMatch(
stream,
regexPattern,
stream.filename
);
const folderNameMatch = determineMatch(
stream,
regexPattern,
stream.folderName
);
const releaseGroupMatch = determineMatch(
stream,
regexPattern,
stream.parsedFile?.releaseGroup
);
const indexerMatch = determineMatch(
stream,
regexPattern,
stream.indexer
);
let match =
filenameMatch ||
folderNameMatch ||
releaseGroupMatch ||
indexerMatch;
match = regexPattern.negate ? !match : match;
if (match) {
stream.regexMatched = {
name: regexPattern.name,
pattern: regexPattern.pattern.source,
index: i,
};
break;
}
}
});
}
if (this.userData.preferredStreamExpressions?.length) {
const selector = new StreamSelector();
const streamToConditionIndex = new Map<string, number>();
// Go through each preferred filter condition, from highest to lowest priority.
for (
let i = 0;
i < this.userData.preferredStreamExpressions.length;
i++
) {
const expression = this.userData.preferredStreamExpressions[i];
// From the streams that haven't been matched to a higher-priority condition yet...
const availableStreams = streams.filter(
(stream) => !streamToConditionIndex.has(stream.id)
);
// ...select the ones that match the current condition.
try {
const selectedStreams = await selector.select(
availableStreams,
expression
);
// And for each of those, record that this is the best condition they've matched so far.
for (const stream of selectedStreams) {
streamToConditionIndex.set(stream.id, i);
}
} catch (error) {
logger.error(
`Failed to apply preferred stream expression "${expression}": ${
error instanceof Error ? error.message : String(error)
}`
);
}
}
// Now, apply the results to the original streams list.
for (const stream of streams) {
stream.streamExpressionMatched = streamToConditionIndex.get(stream.id);
}
}
logger.info(
`Precomputed preferred filters in ${getTimeTakenSincePoint(start)}`
);
}
}
export default StreamPrecomputer;
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