#if os(macOS)
import Foundation
import DocsKit
import Observation
import RastrilloApple
import SwiftUI

/// Scene values are opaque IDs, never credentials. Reserve before opening a scene.
@MainActor @Observable final class DocsWindows {
    struct Entry: Identifiable {
        let id: UUID
        let account: String
        var document: String
        let client: NativeHTTP
        var title: String
        var isOpen = false
        var isDraft = false
    }
    var entries: [Entry] = []
    var activeAccount: String?
    var createRequested = false
    var accountsRequested = false
    func reserve(account: String, document: String, title: String, client: NativeHTTP) -> UUID {
        if let index = entries.firstIndex(where: { $0.account == account && $0.client.origin == client.origin && $0.document == document }) {
            var entry = entries.remove(at: index)
            entry.title = title
            entry.isOpen = true
            entries.insert(entry, at: 0)
            return entry.id
        }
        let entry = Entry(id: UUID(), account: account, document: document, client: client, title: title, isOpen: true)
        entries.insert(entry, at: 0)
        return entry.id
    }
    func reserveDraft(account: String, client: NativeHTTP) -> UUID {
        let id = UUID()
        entries.insert(Entry(id: id, account: account, document: "draft-" + id.uuidString, client: client, title: docsMacString("Untitled document"), isOpen: true, isDraft: true), at: 0)
        return id
    }
    func attach(_ id: UUID, document: String, title: String) {
        guard let index = entries.firstIndex(where: { $0.id == id }) else { return }
        entries[index].document = document; entries[index].title = title; entries[index].isDraft = false
        let account = entries[index].account
        entries.removeAll { $0.id != id && !$0.isOpen && $0.account == account && $0.document == document }
    }
    func updateRecents(_ documents: [(String, String)], account: String, client: NativeHTTP) {
        for (document, title) in documents {
            if let index = entries.firstIndex(where: { $0.account == account && $0.client.origin == client.origin && $0.document == document }) {
                entries[index].title = title
            } else {
                entries.append(Entry(id: UUID(), account: account, document: document, client: client, title: title))
            }
        }
    }
    func setOpen(_ id: UUID, _ value: Bool) {
        if let index = entries.firstIndex(where: { $0.id == id }) {
            if !value && entries[index].isDraft { entries.remove(at: index) } else { entries[index].isOpen = value }
        }
    }
    func canSignOut(_ account: String?) -> Bool { !entries.contains { $0.account == account && $0.isOpen } }
}
extension FocusedValues { @Entry var docsWindowAccount: String? }
#endif