using System.Collections.Generic;

namespace Model
{
    public static class StatusTransitionManager
    {
        private static readonly Dictionary<string, List<string>> transitions =
            new Dictionary<string, List<string>>
            {
                // 掛單狀態
                { "401", new List<string> { "402", "404" } },
                { "402", new List<string> { "403" } },
                { "403", new List<string>() },
                { "404", new List<string>() },

                // 床位狀態
                { "101", new List<string> {"101", "102","103"} },
                { "102", new List<string> { "101" } },
                { "103", new List<string> { "101" } },
            };

        public static bool CanTransition(string currentCode, string targetCode)
        {
            if (string.IsNullOrEmpty(currentCode))
            {
                return targetCode == "401" || targetCode == "402" || targetCode == "101";
            }
            if(string.IsNullOrEmpty(targetCode))
            { return false; }
            return transitions.ContainsKey(currentCode) &&
                   transitions[currentCode].Contains(targetCode);
        }
    }
}