using System.Collections.Generic;
using System.Linq;

namespace VisionCommon {
    public static class FovPatternAgentManager {
        private static object _lock = new object();
        public static Dictionary<SubSysInfo, PatternAgentBase> _PatternAgents = new Dictionary<SubSysInfo, PatternAgentBase>();

        public static void SetAgent(SubSysInfo subSysInfo, PatternAgentBase patternAgent) {
            lock (_lock) {
                if (!_PatternAgents.ContainsKey(subSysInfo)) {
                    _PatternAgents.Add(subSysInfo, patternAgent);
                }
            }
        }

        public static PatternAgentBase GetAgent(SubSysInfo subSysInfo) {
            lock (_lock) {
                if (_PatternAgents.ContainsKey(subSysInfo)) {
                    return _PatternAgents[subSysInfo];
                }
            }
            return null;
        }

        public static Dictionary<SubSysInfo, PatternAgentBase> GetAgents() {
            lock (_lock) {
                return _PatternAgents;
            }
        }

        public static void DeleteUnusedAgent(List<SubSysInfo> newSubSysInfos) {
            lock (_lock) {
                foreach (SubSysInfo oldSubSysInfo in _PatternAgents.Keys.ToList()) {
                    if (!newSubSysInfos.Contains(oldSubSysInfo)) {
                        if (_PatternAgents.ContainsKey(oldSubSysInfo)) {
                            _PatternAgents[oldSubSysInfo].Dispose();
                            _PatternAgents.Remove(oldSubSysInfo);
                        }
                    }
                }
            }
        }

        public static bool IsNewSubSysInfo(SubSysInfo subSysInfo) {
            lock (_lock) {
                if (!_PatternAgents.ContainsKey(subSysInfo)) {
                    return true;
                }
                else {
                    return false;
                }
            }
        }

        public static void Clear() {
            lock (_lock) {
                _PatternAgents.Clear();
            }
        }
    }
}