using MyCore.Interfaces.DTO;
using MyCore.Interfaces.Models;
using MyCore.Services.MyControlPanel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace MyCore.Service.Services
{
    public class GroupService
    {
        public static GroupDetailDTO CreateOrUpdate(GroupDatabaseService _GroupDatabaseService, DeviceDatabaseService _DeviceDatabaseService, string userId, GroupCreateOrUpdateDetailDTO groupCreateOrUpdateDetailDTO, bool create)
        {
            List<Device> devices = new List<Device>();
            Group group;
            if (create)
            {
                group = new Group();
                group.CreatedDate = DateTime.Now;
                group.DevicesIds = new List<string>();
            }
            else
            {
                group = _GroupDatabaseService.GetById(groupCreateOrUpdateDetailDTO.Id);
            }

            group.UserId = userId;
            group.Name = groupCreateOrUpdateDetailDTO.Name;
            group.Type = group.Type; // TODO
            group.UpdatedDate = DateTime.Now;
            group.DevicesIds.AddRange(groupCreateOrUpdateDetailDTO.DeviceIds);

            if (create)
            {
                group = _GroupDatabaseService.Create(group);
            }
            else
            {
                group = _GroupDatabaseService.Update(group);
            }

            foreach (var deviceId in groupCreateOrUpdateDetailDTO.DeviceIds)
            {
                Device device = _DeviceDatabaseService.GetById(deviceId);
                devices.Add(device);
                device.GroupIds.Add(group.Id);
                _DeviceDatabaseService.Update(device);
            }

            return group.ToDTO(devices.Select(d => d.ToDTO()).ToList());
        }

        public static List<GroupDetailDTO> CreateFromZigbeeAsync(GroupDatabaseService _GroupDatabaseService, DeviceDatabaseService _DeviceDatabaseService, string userId, List<Zigbee2MqttGroup> zigbee2MqttGroups) 
        {
            List<GroupDetailDTO> groups = new List<GroupDetailDTO>();

            foreach (var zigbee2MqttGroup in zigbee2MqttGroups.Where(z => z.members.Count > 0)) // Only take group with members
            {
                List<Device> devices = new List<Device>();
                Group group;

                group = new Group();
                group.CreatedDate = DateTime.Now;
                group.DevicesIds = new List<string>();
                group.ServiceIdentification = zigbee2MqttGroup.id;
                group.UserId = userId;
                group.Name = zigbee2MqttGroup.friendly_name;
                group.Type = "zigbee2mqtt";
                group.UpdatedDate = DateTime.Now;

                foreach (var member in zigbee2MqttGroup.members) 
                {
                    Device device = _DeviceDatabaseService.GetByServiceIdentification(member.ieee_address);
                    if (device != null) {
                        group.DevicesIds.Add(device.Id);
                    }
                }
                
                group = _GroupDatabaseService.Create(group);

                foreach (var deviceId in group.DevicesIds)
                {
                    Device device = _DeviceDatabaseService.GetById(deviceId);
                    devices.Add(device);
                    if (device.GroupIds == null)
                        device.GroupIds = new List<string>();
                    device.GroupIds.Add(group.Id);
                    _DeviceDatabaseService.Update(device);
                }

                groups.Add(group.ToDTO(devices.Select(d => d.ToDTO()).ToList()));
            }

            return groups;
        }

        // We only go in this method if the group config change during operation
        public static void CompareGroupsFromZigbee2Mqtt(string userId, List<Group> groups, List<Zigbee2MqttGroup> zigbee2MqttGroups, DeviceDatabaseService _DeviceDatabaseService, GroupDatabaseService _GroupDatabaseService) 
        {
            // We do not refresh all list as we don't want to create plenty of new groupId and have to delete from device param everytime
            List<Zigbee2MqttGroup> existingGroups = new List<Zigbee2MqttGroup>();
            foreach (var group in groups) 
            {
                var devicesFromGroup = _DeviceDatabaseService.GetByGroup(group.Id);
                // convert existing group to zigbee2mqtt group
                existingGroups.Add(new Zigbee2MqttGroup { friendly_name = group.Name, id = group.ServiceIdentification, members = devicesFromGroup.Select(d => new Member() { ieee_address = d.ServiceIdentification }).ToList() }); ;
            }

            foreach (var zigbee2MqttGroup in zigbee2MqttGroups) 
            {
                var existingGroupWithThisId = existingGroups.Where(eg => eg.id == zigbee2MqttGroup.id).ToList().FirstOrDefault();

                if (existingGroupWithThisId == null)
                {
                    // New group -> Create it !
                    CreateFromZigbeeAsync(_GroupDatabaseService, _DeviceDatabaseService, userId, zigbee2MqttGroups.Where(z => z.id == zigbee2MqttGroup.id).ToList());
                } else {
                    if (!Enumerable.SequenceEqual(zigbee2MqttGroup.members.Select(m => m.ieee_address).OrderBy(t => t), existingGroupWithThisId.members.Select(m => m.ieee_address).OrderBy(t => t)))
                    {
                        // different ? Update

                        // As user not change everytime.. => Hard refresh. 
                        var groupToDelete = groups.Where(eg => eg.ServiceIdentification == existingGroupWithThisId.id).FirstOrDefault();

                        // Delete in device first
                        var devicesInGroup = _DeviceDatabaseService.GetByGroup(groupToDelete.Id);

                        foreach (var device in devicesInGroup) 
                        {
                            device.GroupIds = device.GroupIds.Where(g => g != groupToDelete.Id).ToList();
                            _DeviceDatabaseService.Update(device);
                        }
                        // Delete group
                        _GroupDatabaseService.Remove(groupToDelete.Id);

                        // Create new group
                        CreateFromZigbeeAsync(_GroupDatabaseService, _DeviceDatabaseService, userId, new List<Zigbee2MqttGroup>() { zigbee2MqttGroup });
                    }
                }
                // else do nothing
            }
        }


    }
}