import Foundation

enum RsyncLocator {
    static let candidates = [
        "/opt/homebrew/bin/rsync",
        "/usr/local/bin/rsync",
        "/usr/bin/rsync"
    ]

    static func locate() -> String {
        candidates.first(where: isTrustedExecutableCandidate) ?? "/usr/bin/rsync"
    }

    static func isTrustedExecutableCandidate(_ path: String) -> Bool {
        let manager = FileManager.default
        guard manager.isExecutableFile(atPath: path) else { return false }

        let resolved = URL(fileURLWithPath: path).resolvingSymlinksInPath().path
        var isDirectory: ObjCBool = false
        guard manager.fileExists(atPath: resolved, isDirectory: &isDirectory), !isDirectory.boolValue else { return false }

        do {
            let attributes = try manager.attributesOfItem(atPath: resolved)
            return attributes[.type] as? FileAttributeType == .typeRegular
        } catch {
            return false
        }
    }
}