//
//  AccountManager.swift
//  Nextcloud Cookbook iOS Client
//
//  Created by Vincent Meilinger on 16.01.25.
//

import Foundation

@Observable
class AccountManager {
    var accounts: [any Account] = []
    var authTokens: [String: String] = [:]
    
    /// Save account as JSON.
    func save(account: any Account, authToken: String?) async throws {
        account.saveTokenToKeychain(authToken!)
        let data = try JSONEncoder().encode(account)
        
        let accountDir = account.accountType.rawValue + "/" + account.id.uuidString + "/account.json"
        await DataStore.shared.save(data: data, toPath: accountDir)
    }
    
    /// Load accounts from JSON files.
    func loadAccounts() async throws {
        // Read data from file or user defaults
        for accountType in AccountType.allCases {
            // List all account UUIDs under the /accountType directory
            let accountUUIDs = DataStore.shared.listAllFolders(dir: accountType.rawValue + "/")
            
            // Decode each account and fetch the authToken
            for accountUUID in accountUUIDs {
                do {
                    guard let account = try await DataStore.shared.loadDynamic(fromPath: accountType.rawValue + "/" + accountUUID + "/account.json", type: accountType.accountType) else {
                        continue
                    }
                    authTokens[accountUUID] = (account as! any Account).getTokenFromKeychain() ?? ""
                    self.accounts.append(account as! (any Account))
                } catch {
                    continue
                }
            }
        }
    }
}