import class Foundation.Bundle
import class Foundation.ProcessInfo
import struct Foundation.URL

private class BundleFinder {}

extension Foundation.Bundle {
    /// Returns the resource bundle associated with the current Swift module.
    static let module: Bundle = {
        let bundleName = "swift-crypto_Crypto"

        let overrides: [URL]
        #if DEBUG
        // The 'PACKAGE_RESOURCE_BUNDLE_PATH' name is preferred since the expected value is a path. The
        // check for 'PACKAGE_RESOURCE_BUNDLE_URL' will be removed when all clients have switched over.
        // This removal is tracked by rdar://107766372.
        if let override = ProcessInfo.processInfo.environment["PACKAGE_RESOURCE_BUNDLE_PATH"]
                       ?? ProcessInfo.processInfo.environment["PACKAGE_RESOURCE_BUNDLE_URL"] {
            overrides = [URL(fileURLWithPath: override)]
        } else {
            overrides = []
        }
        #else
        overrides = []
        #endif

        let candidates = overrides + [
            // Bundle should be present here when the package is linked into an App.
            Bundle.main.resourceURL,

            // Bundle should be present here when the package is linked into a framework.
            Bundle(for: BundleFinder.self).resourceURL,

            // For command-line tools.
            Bundle.main.bundleURL,
        ]

        for candidate in candidates {
            let bundlePath = candidate?.appendingPathComponent(bundleName + ".bundle")
            if let bundle = bundlePath.flatMap(Bundle.init(url:)) {
                return bundle
            }
        }
        fatalError("unable to find bundle named swift-crypto_Crypto")
    }()
}