import Foundation

enum ClaudeAuthService {
    static func parseOAuthJSON(_ json: [String: Any], source: ClaudeCredentialSource = .credentialsFile) throws -> ClaudeOAuthCredentials {
        let oauth = json["claudeAiOauth"] as? [String: Any]
        guard let oauth,
              let accessToken = oauth["accessToken"] as? String,
              !accessToken.isEmpty
        else {
            throw ClaudeAuthError.tokenNotFound
        }

        var expiresAt: Date?
        if let expiresMs = oauth["expiresAt"] as? Double {
            expiresAt = Date(timeIntervalSince1970: expiresMs / 1000)
        }

        let subscriptionType = oauth["subscriptionType"] as? String
        return ClaudeOAuthCredentials(
            accessToken: accessToken,
            expiresAt: expiresAt,
            subscriptionType: subscriptionType,
            source: source
        )
    }
}

enum ClaudeCredentialSource: String, Sendable {
    case credentialsFile
    case manual
}

enum ClaudeAuthError: Error, LocalizedError {
    case tokenNotFound

    var errorDescription: String? {
        switch self {
        case .tokenNotFound:
            "No OAuth token found."
        }
    }
}

struct ClaudeOAuthCredentials: Sendable {
    let accessToken: String
    let expiresAt: Date?
    let subscriptionType: String?
    let source: ClaudeCredentialSource
}