//
//  GroceryStateModels.swift
//  Nextcloud Cookbook iOS Client
//

import Foundation

/// Tracks grocery list state for a recipe, stored as `_groceryState` in the recipe JSON on the server.
struct GroceryState: Codable {
    var version: Int = 1
    var lastModified: String
    var items: [String: GroceryItemState]

    init(lastModified: String = GroceryStateDate.now(), items: [String: GroceryItemState] = [:]) {
        self.version = 1
        self.lastModified = lastModified
        self.items = items
    }
}

struct GroceryItemState: Codable {
    enum Status: String, Codable {
        case added
        case completed
        case removed
    }

    var status: Status
    var addedAt: String
    var modifiedAt: String

    init(status: Status, addedAt: String = GroceryStateDate.now(), modifiedAt: String = GroceryStateDate.now()) {
        self.status = status
        self.addedAt = addedAt
        self.modifiedAt = modifiedAt
    }
}

/// ISO 8601 date helpers. Dates are stored as strings to avoid coupling to a parent encoder's date strategy.
enum GroceryStateDate {
    private static let formatter: ISO8601DateFormatter = {
        let f = ISO8601DateFormatter()
        f.formatOptions = [.withInternetDateTime]
        return f
    }()

    static func now() -> String {
        formatter.string(from: Date())
    }

    static func date(from string: String) -> Date? {
        formatter.date(from: string)
    }

    static func string(from date: Date) -> String {
        formatter.string(from: date)
    }
}