// The Swift Programming Language
// https://docs.swift.org/swift-book

import Foundation
import ArgumentParser
import JellyfinAPI
import CryptoKit
import Logging

let SeanutVersion = "0.0.1"

@main
struct Seanut: AsyncParsableCommand {
    static var configuration = CommandConfiguration(
      abstract: "A utility to download media from jellyfin servers",
      subcommands: [SearchCommand.self, DownloadCommand.self, LoginCommand.self],
      defaultSubcommand: SearchCommand.self
    )

    static var Logger: Logger? = nil

    struct CommonArguments: ParsableArguments {
        @Option(name: .shortAndLong, help: "jellyfin server domain name")
        var domain: String

        @Flag(name: .long, help: "prints extra information to the console")
        var verbose = false
    }

    static func maybeSetLogger(_ opts: CommonArguments) {
        Seanut.Logger = opts.verbose ? Logging.Logger(label: "garden.focks.SeanutSwift.logger") : nil
    }

    static func generateJellyfinConfiguration(url: URL) -> JellyfinClient.Configuration {
        let hostname = Host.current().localizedName ?? "Seanut-Device"
        let digest = SHA256.hash(data: hostname.data(using: .utf8)!)
        
        return JellyfinClient.Configuration(
          url: url,
          client: "SeanutSwift",
          deviceName: hostname,
          deviceID: digest.compactMap({ String(format: "%02x", $0) }).joined(),
          version: SeanutVersion
        )
    }

    static func getAccessToken(client: JellyfinClient, username: String, password: String?) async {
        let pass: String? = password ?? {
            print("password>", terminator: " ")
            return readLine(strippingNewline: true)
        }()
        let domain = client.configuration.url.host!
        
        do {
            let auth = try await client.signIn(username: username,
                                               password: pass ?? "")
            let fileName = FileManager.default
              .homeDirectoryForCurrentUser
              .appendingPathComponent(".seanut/\(domain)")
            
            try auth.accessToken!.write(to: fileName, atomically: false, encoding: .utf8)
            print("Access token retrieved ☑️")
        } catch {
            print("Failed to login with provided credentials. please try again later.")
            exit(withError: error)
        }
    }

    static func retrieveAccessToken(for domain: URL) -> String? {
        let tokenPath = FileManager.default
          .homeDirectoryForCurrentUser
          .appendingPathComponent(".seanut/\(domain.host!)")
        return try? String(contentsOf: tokenPath) 
    }
}