import Foundation

@MainActor
@Observable
final class AIHistoryViewModel {
    var selectedFilter: AIHistoryFilter = .all
    var showDeleteAllConfirmation = false
    var entryPendingDeletion: AIHistoryEntry?

    private let historyManager: AIHistoryManager

    init(historyManager: AIHistoryManager = .shared) {
        self.historyManager = historyManager
    }

    var filteredEntries: [AIHistoryEntry] {
        historyManager.entries(matching: selectedFilter)
    }

    var isEmpty: Bool {
        historyManager.isEmpty
    }

    var hasFilteredEntries: Bool {
        !filteredEntries.isEmpty
    }

    func requestDelete(_ entry: AIHistoryEntry) {
        entryPendingDeletion = entry
    }

    func confirmDelete() {
        guard let entry = entryPendingDeletion else { return }
        historyManager.delete(id: entry.id)
        entryPendingDeletion = nil
    }

    func cancelDelete() {
        entryPendingDeletion = nil
    }

    func requestDeleteAll() {
        showDeleteAllConfirmation = true
    }

    func confirmDeleteAll() {
        historyManager.deleteAll()
        showDeleteAllConfirmation = false
    }

    func cancelDeleteAll() {
        showDeleteAllConfirmation = false
    }
}