Outpost/Outpost/Root/SessionStore.swift

import Foundation
import Observation
import OutlineKit

@MainActor
@Observable
final class SessionStore {
    private static let serverURLDefaultsKey = "outline.serverURL"

    private let tokenStore: TokenStoring
    private let defaults: UserDefaults

    var isSignedIn: Bool
    private(set) var userId: String?
    var userName: String?
    var userEmail: String?
    var userAvatarURL: URL?
    var userLanguage: String?
    var userPreferences: OutlineUserPreferences?
    var teamName: String?
    var teamAvatarURL: URL?
    private(set) var apiClient: OutlineAPIClient?
    /// Same object as `apiClient` when the offline cache is available — kept
    /// as a separately-typed reference so Settings can reach cache/sync-queue
    /// specific methods (`flushPendingOperations`, `performFullSync`, etc.)
    /// without downcasting the protocol-typed `apiClient` everywhere.
    private(set) var cachingClient: CachingOutlineAPIClient?
    let networkMonitor = NetworkMonitor()
    /// `nil` only if the on-disk SwiftData store failed to open (e.g. disk
    /// full) — in that case `apiClient` falls back to talking to the server
    /// directly with no offline cache, rather than failing sign-in outright.
    private let cacheStore: OfflineCacheStore?

    var serverURL: URL? {
        defaults.string(forKey: Self.serverURLDefaultsKey).flatMap(URL.init(string:))
    }

    init(tokenStore: TokenStoring = KeychainTokenStore(), defaults: UserDefaults = .standard) {
        self.tokenStore = tokenStore
        self.defaults = defaults
        self.isSignedIn = (try? tokenStore.token()) != nil
        self.cacheStore = (try? OfflineCacheStore.makeContainer()).map(OfflineCacheStore.init(modelContainer:))

        if isSignedIn, let serverURL {
            (apiClient, cachingClient) = Self.makeAPIClient(serverURL: serverURL, tokenStore: tokenStore, cache: cacheStore)
        }
    }

    func signIn(serverURL: URL, user: OutlineUser, team: OutlineTeam) {
        defaults.set(serverURL.absoluteString, forKey: Self.serverURLDefaultsKey)
        (apiClient, cachingClient) = Self.makeAPIClient(serverURL: serverURL, tokenStore: tokenStore, cache: cacheStore)
        apply(user: user, team: team, serverURL: serverURL)
        isSignedIn = true
    }

    private static func makeAPIClient(
        serverURL: URL,
        tokenStore: TokenStoring,
        cache: OfflineCacheStore?
    ) -> (OutlineAPIClient, CachingOutlineAPIClient?) {
        let live = LiveOutlineAPIClient(
            configuration: OutlineConfiguration(baseURL: serverURL),
            tokenStore: tokenStore
        )
        guard let cache else { return (live, nil) }
        let caching = CachingOutlineAPIClient(live: live, cache: cache)
        return (caching, caching)
    }

    func signOut() {
        try? tokenStore.clear()
        defaults.removeObject(forKey: Self.serverURLDefaultsKey)
        isSignedIn = false
        userId = nil
        userName = nil
        userEmail = nil
        userAvatarURL = nil
        userLanguage = nil
        userPreferences = nil
        teamName = nil
        teamAvatarURL = nil
        apiClient = nil
        cachingClient = nil
    }

    /// Re-fetches user/workspace name/logo on relaunch, when the token survived but this
    /// in-memory state didn't.
    func refreshTeamInfoIfNeeded() async {
        guard isSignedIn, teamName == nil, let apiClient, let serverURL else { return }
        guard let auth = try? await apiClient.authInfo() else { return }
        apply(user: auth.user, team: auth.team, serverURL: serverURL)
    }

    /// Settings calls this after a successful name/avatar change so the
    /// sidebar's account footer and everywhere else reading these reflect
    /// it immediately, without waiting for the next `auth.info` refresh.
    func applyUpdatedProfile(_ user: OutlineUser) {
        guard let serverURL else { return }
        userId = user.id
        userName = user.name
        userAvatarURL = user.avatarUrl.flatMap { URL(string: $0, relativeTo: serverURL)?.absoluteURL }
        userLanguage = user.language
        userPreferences = user.preferences
    }

    private func apply(user: OutlineUser, team: OutlineTeam, serverURL: URL) {
        userId = user.id
        userName = user.name
        userEmail = user.email
        // Outline can return either an absolute URL or a server-relative path
        // (e.g. `/api/files.get?key=...`) for avatarUrl — resolve against the
        // configured server so relative paths don't fail as "unsupported URL".
        userAvatarURL = user.avatarUrl.flatMap { URL(string: $0, relativeTo: serverURL)?.absoluteURL }
        userLanguage = user.language
        userPreferences = user.preferences
        teamName = team.name
        teamAvatarURL = team.avatarUrl.flatMap { URL(string: $0, relativeTo: serverURL)?.absoluteURL }
    }
}