import Foundation

/// Uploads the social.org file to a WebDAV server via HTTP PUT.
///
/// Supports optional Basic Auth. The `url` must point directly to the
/// `social.org` file on the WebDAV server.
public struct WebDAVUploader: FeedUploader {

    public let url: URL
    public let username: String?
    public let password: String?
    private let session: URLSession

    public init(url: URL, username: String? = nil, password: String? = nil, session: URLSession = .shared) {
        self.url = url
        self.username = username
        self.password = password
        self.session = session
    }

    public func upload(content: String) async throws {
        var request = URLRequest(url: url)
        request.httpMethod = "PUT"
        request.setValue("text/plain; charset=utf-8", forHTTPHeaderField: "Content-Type")
        request.httpBody = Data(content.utf8)

        if let username, let password, !username.isEmpty {
            let credentials = Data("\(username):\(password)".utf8).base64EncodedString()
            request.setValue("Basic \(credentials)", forHTTPHeaderField: "Authorization")
        }

        let (_, response): (Data, URLResponse)
        do { (_, response) = try await session.data(for: request) }
        catch { throw UploadError.networkError(underlying: error.localizedDescription) }

        if let http = response as? HTTPURLResponse, !(200..<300).contains(http.statusCode) {
            throw UploadError.uploadFailed(statusCode: http.statusCode)
        }
    }
}