using System.Collections.Generic;
using System.Globalization;
using System;

[Serializable]
public class DispatchProperty
{
    [Serializable]
    public class AreaProperty
    {
        public WorldArea areaType;
        public float[] rndMissionPosMoveTime = new float[] { 10, 20, 30, 40, 50, 60 };
        public DispatchMissionProperty[] missionProperties;

        public int MaxRndMissionPosCnt => rndMissionPosMoveTime.Length;
    }

    public uint maxLevel = 100;
    public uint maxEmployeeCount = 3;
    public float missionProgressTimeSec = 5;
    public float missionRefreshTimeSec = 60;

    public AreaProperty[] areas = new AreaProperty[]
    {
        new AreaProperty { areaType = WorldArea.East },
        new AreaProperty { areaType = WorldArea.West },
        new AreaProperty { areaType = WorldArea.South },
        new AreaProperty { areaType = WorldArea.North },
    };
}

[Serializable]
public class DispatchPlayerProperty
{
    [Serializable]
    public class AreaPlayerProperty
    {
        public WorldArea areaType;
        public bool needRefreshMission;
        public bool needClearEmployee;
        public string refreshEndTime = DateTime.MaxValue.ToString(FormatString.DateTimeParse, CultureInfo.InvariantCulture);
        public int missionPositionIndex;
        public uint[] employeeIDs = new uint[0];
        public DispatchMissionPlayerProperty mission;
    }

    public uint dispatchExp;

    public AreaPlayerProperty[] areas = new AreaPlayerProperty[]
    {
        new AreaPlayerProperty { areaType = WorldArea.East },
        new AreaPlayerProperty { areaType = WorldArea.West },
        new AreaPlayerProperty { areaType = WorldArea.South },
        new AreaPlayerProperty { areaType = WorldArea.North },
    };
}

public partial class DispatchData
{
    DispatchProperty property;
    DispatchPlayerProperty playerProperty;

    Area[] areas;

    public uint MaxLevel => property.maxLevel;
    public uint MaxEmployeeCount => property.maxEmployeeCount;
    public float MissionRefreshTimeSec => property.missionRefreshTimeSec;
    public uint DispatchLevel { get; private set; }
    public uint DispatchExp => playerProperty.dispatchExp;
    public IList<Area> Areas => areas;

    public DispatchData(DispatchProperty property, DispatchPlayerProperty playerProperty)
    {
        this.property = property;
        this.playerProperty = playerProperty;

        areas = new Area[playerProperty.areas.Length];
        for (int i = 0; i < areas.Length; ++i)
        {
            areas[i] = new Area(this, property.areas[i], playerProperty.areas[i]);
        }

        DispatchLevel = GetDispatchLevelByExp(playerProperty.dispatchExp);
    }

    public bool AddDispatchExp(uint exp)
    {
        playerProperty.dispatchExp += exp;

        uint prevLevel = DispatchLevel;
        DispatchLevel = GetDispatchLevelByExp(DispatchExp, DispatchLevel);

        return prevLevel != DispatchLevel;
    }

    public uint GetDispatchLevelByExp(uint exp, uint offset = 2)
    {
        if (offset < 2)
            offset = 2;
        
        for (uint i = offset; i <= MaxLevel; i++)
        {
            if(exp < GetTotalExpToLevel(i))
                return i - 1;
        }

        return MaxLevel;
    }

    public uint GetTotalExpToLevel(uint level)
    {
        //TODO : this is temp code
        const uint baseExp = 100;
        const uint expPerLevel = 10;

        if(level < 2) return 0;

        uint a = level - 1;
        uint b = a - 1;

        return baseExp * a + expPerLevel * Utility.PermutationAdd(b);
    }

    public bool TryGetArea(WorldArea areaType, out Area result)
    {
        result = null;

        for (int i = 0; i < areas.Length; ++i)
        {
            if (areas[i].AreaType == areaType)
            {
                result = areas[i];
                break;
            }
        }

        return result != null;
    }
}

public partial class DispatchData
{
    [Serializable]
    public class Area
    {
        DispatchProperty.AreaProperty property;
        DispatchPlayerProperty.AreaPlayerProperty playerProperty;

        public DispatchData DispatchData { get; private set; }
        public DispatchMissionData Mission { get; private set; }
        public WorldArea AreaType => playerProperty.areaType;
        public DateTime RefreshEndTime => DateTime.ParseExact(playerProperty.refreshEndTime, FormatString.DateTimeParse, CultureInfo.InvariantCulture);
        public int MissionPositionIndex => playerProperty.missionPositionIndex;
        public IList<uint> EmployeeIDs => playerProperty.employeeIDs;
        public float MissionMoveTime => property.rndMissionPosMoveTime[MissionPositionIndex];
        public float MissionProgressTime => DispatchData.property.missionProgressTimeSec;
        public bool NeedRefreshMission => playerProperty.needRefreshMission;
        public bool NeedClearEmployee => playerProperty.needClearEmployee;
        public string ImageAtlasPath => GameProperty.Instance.AreaImageAtlasName;
        public string ImageNameInAtlas => AreaType.ToString();

        public event Action OnRefreshMission;

        public Area(DispatchData dispatchData, DispatchProperty.AreaProperty areaProperty, DispatchPlayerProperty.AreaPlayerProperty areaPlayerProperty)
        {
            property = areaProperty;
            playerProperty = areaPlayerProperty;

            DispatchData = dispatchData;

            if (TryGetAreaMissionProperty(out var missionProp))
                Mission = new DispatchMissionData(this, missionProp, playerProperty.mission);
            else
                RefreshMission(TimeUtils.Now());
        }

        private bool TryGetAreaMissionProperty(out DispatchMissionProperty result)
        {
            for (int j = 0; j < property.missionProperties.Length; ++j)
            {
                var missionProp = property.missionProperties[j];
                if (missionProp.id == playerProperty.mission.id)
                {
                    result = missionProp;
                    return true;
                }
            }

            result = null;
            return false;
        }

        public void SetEmployeeID(int slotIndex, uint id)
        {
            if (slotIndex >= playerProperty.employeeIDs.Length)
                Array.Resize(ref playerProperty.employeeIDs, slotIndex + 1);

            playerProperty.employeeIDs[slotIndex] = id;
        }

        public void ClearEmployeeID()
        {
            playerProperty.employeeIDs = new uint[DispatchData.MaxEmployeeCount];
        }

        public void StartRefreshTime(DateTime now)
        {
            playerProperty.needRefreshMission = true;
            playerProperty.refreshEndTime = (now.AddSeconds(DispatchData.MissionRefreshTimeSec)).ToString(FormatString.DateTimeParse, CultureInfo.InvariantCulture);
        }

        public bool IsInRefreshTime(DateTime now) => now < RefreshEndTime;

        public void StartMission(DateTime now)
        {
            playerProperty.needClearEmployee = true;
            Mission.Start(now);
        }

        public void RefreshMission(DateTime now)
        {
            if (!property.missionProperties.TryGetRandomValue(out var missionProp))
            {
                Logger.LogError("Can't find mission property for area type: " + AreaType.ToString());
                return;
            }

            playerProperty.needRefreshMission = false;
            playerProperty.needClearEmployee = false;
            playerProperty.refreshEndTime = now.ToString(FormatString.DateTimeParse, CultureInfo.InvariantCulture);
            playerProperty.missionPositionIndex = UnityEngine.Random.Range(0, property.MaxRndMissionPosCnt);
            ClearEmployeeID();

            playerProperty.mission.id = missionProp.id;
            playerProperty.mission.gotReward = true;
            playerProperty.mission.needGetResult = false;
            playerProperty.mission.hasResult = false;
            playerProperty.mission.isSucceed = false;
            playerProperty.mission.recommendNationalities = GetRecommendNationalities();
            playerProperty.mission.bonusRewardTargets = GetRandomBonusRewards(missionProp);
            playerProperty.mission.endTime = now.ToString(FormatString.DateTimeParse, CultureInfo.InvariantCulture);

            Mission = new DispatchMissionData(this, missionProp, playerProperty.mission);

            OnRefreshMission?.Invoke();
        }

        private uint[] GetRecommendNationalities()
        {
            //TODO : get max count by dispatch level
            const int maxCount = 3;

            var result = new uint[maxCount];
            for (int i = 0; i < maxCount; ++i)
            {
                result[i] = (uint)UnityEngine.Random.Range(0, (int)Nationality.Kind.Count);
            }

            return result;
        }

        private uint[] GetRandomBonusRewards(DispatchMissionProperty missionProp)
        {
            //TODO : get random bonus rewards
            const int maxCount = 3;

            if(missionProp.rewardCandidates.Length < maxCount)
                throw new Exception("Not enough reward candidates");

            var result = new uint[maxCount];

            var candidates = new HashSet<uint>();
            for(uint i = 0; i < missionProp.rewardCandidates.Length; i++)
            {
                candidates.Add(i);
            }

            int curCount = 0;
            while(curCount < maxCount)
            {
                uint rnd = (uint)UnityEngine.Random.Range(0, missionProp.rewardCandidates.Length);
                if(candidates.Contains(rnd))
                {
                    result[curCount++] = rnd;
                    candidates.Remove(rnd);
                }
            }

            return result;
        }
    }
}