Function checkSeasonPattern

Source

export function checkSeasonPattern(
  leftTitle: string,
  rightTitle: string,
): number {
  // Patterns to detect season/part/volume indicators
  const seasonPatterns = [
    // Basic season patterns
    /season\s+(\d+)/gi,
    /s(\d+)(?:\s|$)/gi,
    /saison\s+(\d+)/gi,

    // Part patterns
    /part\s+(\d+)/gi,
    /partie\s+(\d+)/gi,

    // Volume patterns
    /vol\.\s*(\d+)/gi,
    /volume\s+(\d+)/gi,

    // Tome patterns (French)
    /tome\s+(\d+)/gi,

    // Roman numerals (more comprehensive)
    /\b(?:season|part|tome|vol\.?|volume)?\s*([IVX]+)\b/gi,

    // Arc patterns
    /arc\s+(\d+)/gi,

    // Cour patterns (anime seasons)
    /cour\s+(\d+)/gi,
  ];

  // Check if either title contains any season pattern
  let hasLeftPattern = false;
  let hasRightPattern = false;

  for (const pattern of seasonPatterns) {
    if (pattern.test(leftTitle)) hasLeftPattern = true;
    if (pattern.test(rightTitle)) hasRightPattern = true;
  }

  // If only one has a season pattern, remove it and check similarity
  if (hasLeftPattern || hasRightPattern) {
    let cleanLeft = leftTitle;
    let cleanRight = rightTitle;

    // Remove all season patterns
    for (const pattern of seasonPatterns) {
      cleanLeft = cleanLeft.replaceAll(pattern, "").trim();
      cleanRight = cleanRight.replaceAll(pattern, "").trim();
    }

    // Normalize and compare
    const normalizedLeft = cleanLeft
      .toLowerCase()
      .replaceAll(/[^\w\s]/g, "")
      .trim();
    const normalizedRight = cleanRight
      .toLowerCase()
      .replaceAll(/[^\w\s]/g, "")
      .trim();
    if (normalizedLeft === normalizedRight) {
      return 0.95; // High similarity, just season difference
    }
  }

  return -1; // No season pattern detected
}
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