//
//  SaveAndRefreshMenu.swift
//  Todos
//
//  Created by Sam Jaffe on 3/9/26.
//

import SwiftUI
import SwiftData
internal import Combine

struct AutosaveMenu: View {
  @Environment(\.modelContext) private var modelContext
  @AppStorage(UserDefaultsKeys.WeekStart) private var weekStart = Date()
  let inPreview = ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"

  @Query private var items: [Project]
  @Binding var hasAutosave: Bool

  var body: some View {
    Button("Save and Cleanup") {
      tryAutosave()
    }
    .keyboardShortcut("R", modifiers: [.command, .shift])
//    .disabled(!shouldAutosave)

    Text("     Next Autosave: after \(ymd(nextSunday(weekStart)))")
      .onAppear(perform: tryAutosave)
  }

  func tryAutosave() {
    if shouldAutosave && !inPreview {
      saveAndCleanup(weekStart)
      weekStart = Date()
      hasAutosave = true
    }
  }

  func nextSunday(_ date: Date) -> Date {
    Calendar.current.nextDate(after: date,
                              matching: DateComponents(weekday: 1),
                              matchingPolicy: .nextTime)!
  }

  func ymd(_ date: Date) -> String {
    date.formatted(.iso8601.year().month().day())
  }

  var shouldAutosave: Bool {
    ymd(Date()) > ymd(nextSunday(weekStart))
  }

  func saveAndCleanup(_ date: Date) {
    SaveController.save(items, toUrl: SaveController.filename(date: ymd(date)))

    for item in items {
      item.tasks.removeAll(where: { $0.status == .complete })
      for task in item.tasks {
        if task.status == .inProgress {
          task.status = .todo
        }

        task.subtasks.removeAll(where: { $0.status == .complete })
        for subtask in task.subtasks where subtask.status == .inProgress {
          subtask.status = .todo
        }
      }
    }
  }
}

#Preview {
  @Previewable @State var hasAutosave = true
  AutosaveMenu(hasAutosave: $hasAutosave)
}