import { isMatchingSnak } from './is_matching_snak.js'

export function isMatchingClaimFactory (newClaim, matchingQualifiers) {
  return function isMatchingClaim (existingClaim) {
    const { mainsnak, qualifiers = {} } = existingClaim
    if (!isMatchingSnak(mainsnak, newClaim.mainsnak)) return false
    if (matchingQualifiers) {
      for (const property of matchingQualifiers) {
        const [ pid, option = 'all' ] = property.split(':')
        if (newClaim.qualifiers[pid] != null && qualifiers[pid] == null) return false
        if (newClaim.qualifiers[pid] == null && qualifiers[pid] != null) return false
        const propertyQualifiersMatch = matchFunctions[option](newClaim.qualifiers[pid], qualifiers[pid])
        if (!propertyQualifiersMatch) return false
      }
    }
    return true
  }
}

const matchFunctions = {
  all: (newPropertyQualifiers, existingPropertyQualifiers) => {
    for (const newQualifier of newPropertyQualifiers) {
      for (const existingQualifier of existingPropertyQualifiers) {
        if (!isMatchingSnak(existingQualifier, newQualifier)) return false
      }
    }
    return true
  },
  any: (newPropertyQualifiers, existingPropertyQualifiers) => {
    for (const newQualifier of newPropertyQualifiers) {
      for (const existingQualifier of existingPropertyQualifiers) {
        if (isMatchingSnak(existingQualifier, newQualifier)) return true
      }
    }
    return false
  },
}