FEDEO/backend/src/modules/banking-institution.ts

export type BankingInstitution = {
    bic?: unknown
    [key: string]: unknown
}

export const findBankInstitutionByBic = (
    institutions: unknown,
    bic: string,
): BankingInstitution | null => {
    if (!Array.isArray(institutions)) return null

    const normalizedBic = bic.trim().toUpperCase()
    if (!normalizedBic) return null

    const institution = institutions.find((candidate): candidate is BankingInstitution => {
        if (!candidate || typeof candidate !== "object") return false
        const candidateBic = (candidate as BankingInstitution).bic
        return typeof candidateBic === "string" && candidateBic.trim().toUpperCase() === normalizedBic
    })

    return institution || null
}