//
//  MoodStatusViewModel.swift
//  QuickLocation
//

import Foundation
import RxSwift
import RxCocoa

final class MoodStatusViewModel {

    enum SaveValidation {
        case missing
        case ready(Int)
    }

    let items = MoodStatusCatalog.items
    let selectedMoodIndex = BehaviorRelay<Int?>(value: nil)

    private(set) var isSaving = false

    init() {
        let mood = AppContextManager.shared.account?.mood ?? 0
        if (1...36).contains(mood) {
            selectedMoodIndex.accept(mood)
        } else if let firstMoodIndex = items.first?.moodIndex {
            selectedMoodIndex.accept(firstMoodIndex)
        }
    }

    func select(moodIndex: Int) {
        selectedMoodIndex.accept(moodIndex)
    }

    func applyServerMood(_ moodIndex: Int) {
        if MoodStatusCatalog.item(moodIndex: moodIndex) != nil {
            selectedMoodIndex.accept(moodIndex)
        } else {
            selectedMoodIndex.accept(items.first?.moodIndex)
        }
    }

    func selectedItem() -> MoodStatusItem? {
        guard let moodIndex = selectedMoodIndex.value else { return nil }
        return MoodStatusCatalog.item(moodIndex: moodIndex)
    }

    func validateSave() -> SaveValidation {
        guard let moodIndex = selectedMoodIndex.value else { return .missing }
        return .ready(moodIndex)
    }

    func beginSaving() {
        isSaving = true
    }

    func endSaving() {
        isSaving = false
    }
}