using System;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using GazpromApp.Messages;
using GazpromApp.Models;
using GazpromApp.Utils;

namespace GazpromApp.ViewModels;

public partial class EquipmentViewModel : ViewModelBase
{
    public ViewModelBase? Parent { get; set; }
    private Equipment Equipment { get; }

    [ObservableProperty]
    private string? _name;
    
    [ObservableProperty]
    private string? _description;

    [ObservableProperty] 
    private DateTime _creationDate;

    public ObservableCollection<ImageViewModel> Images { get; set; } = [];
    
    public ObservableCollection<PropertyViewModel> Properties { get; set; }

    public ObservableCollection<InspectionViewModel> Inspections { get; set; }
    
    public ObservableCollection<EquipmentViewModel> Equipments { get; set; }
    
    [ObservableProperty]
    private string _nearestInspection;

    [RelayCommand]
    private void AddEquipment()
    {
        Equipments.Add(new EquipmentViewModel{ Name = "Новое оборудование", Description = "Описание оборудования", Parent = this});
        CallSavePoint(this);
    }
    
    [RelayCommand]
    private void RemoveEquipment()
    {
        WeakReferenceMessenger.Default.Send(new RemoveEquipmentMessage(this));
    }
    
    private void RemoveEquipment(object sender, RemoveEquipmentMessage msg)
    {
        if (Equipments.Contains(msg.Equipment))
            Equipments.Remove(msg.Equipment);
        CallSavePoint(this);
    }

    private void CallSavePoint(EquipmentViewModel equipment)
    {
        var current = equipment;
        while (current.Parent is EquipmentViewModel model)
            current = model ?? throw new InvalidOperationException("Parent equipment not found in hierarchy");  

        if (current.Parent is PointViewModel pointViewModel)
            WeakReferenceMessenger.Default.Send(new EditPointMessage(pointViewModel));
    }
    
    public EquipmentViewModel()
    {
        Name = string.Empty;
        Description = string.Empty;
        CreationDate = DateTime.Now;
        Properties = [];
        Inspections = [];
        Equipments = [];
        NearestInspection = "Нету инспекций";
        Equipment = new Equipment();
        
        WeakReferenceMessenger.Default.Register<RemoveEquipmentMessage>(this, RemoveEquipment);
    }

    public EquipmentViewModel(Equipment equipment)
    {
        Name = equipment.Name;
        Description = equipment.Description;
        CreationDate = equipment.CreationDate;
        Images = new ObservableCollection<ImageViewModel>(equipment.Images.Select(i => new ImageViewModel(i)));
        Properties = new ObservableCollection<PropertyViewModel>(equipment.Properties.Select(e => new PropertyViewModel(e)));
        Equipments = new ObservableCollection<EquipmentViewModel>(equipment.Equipments.Select(e => new EquipmentViewModel(e){Parent = this}));
        
        var times = equipment.Inspections.Select(e => new InspectionViewModel(e))
            .Select(e => e.GetNearestDates())
            .ToList();
        
        Inspections = new ObservableCollection<InspectionViewModel>(equipment.Inspections
            .Select((e, i) => new InspectionViewModel(e) { InspectionDate = times[i][0] }));
        
        NearestInspection = times
            .Where(e => e[1] > DateTime.Now)
            .Select(e => e[1])
            .OrderBy(e => e)
            .FirstOrDefault()
            .ToLongDateString();

        if (Inspections.Count == 0) NearestInspection = "Нету инспекций";
        Equipment = equipment;
        
        WeakReferenceMessenger.Default.Register<RemoveEquipmentMessage>(this, RemoveEquipment);
    }

    public Equipment GetEquipment()
    {
        Equipment.Name = Name;
        Equipment.Description = Description;
        Equipment.CreationDate = CreationDate;
        Equipment.Images = Images.Select(e => e.GetImage()).ToList();
        Equipment.Inspections = Inspections.Select(e => e.GetInspection()).ToList();
        Equipment.Properties = Properties.Select(e => e.GetProperty()).ToList();
        Equipment.Equipments = Equipments.Select(e => e.GetEquipment()).ToList();
        
        return Equipment;
    }
}