namespace GrossesMitainesAPI.Controllers;

#region Dependencies
using GrossesMitainesAPI.Data;
using GrossesMitainesAPI.Models;
using GrossesMitainesAPI.Services;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Cors;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNet.Identity;
using System.Data;
using System.Linq;

#endregion

[EnableCors("_myAllowSpecificOrigins"), ApiController, Route("api/[controller]"),
 Authorize(AuthenticationSchemes = "Identity.Application", Roles = "Administrateur")]
public class InvoiceController : Controller {
    #region DI Fields
    private readonly ILogger<InvoiceController> _logger;
    private readonly InventoryContext _context;
    private readonly DatabaseCacheService _cache;
    private readonly SignInManager<InventoryUser> _signInMan;
    private readonly Microsoft.AspNetCore.Identity.UserManager<InventoryUser> _userMan;

    #endregion

    #region Ctor
    public InvoiceController(ILogger<InvoiceController> logger,
                             InventoryContext context,
                             DatabaseCacheService cache,
                             SignInManager<InventoryUser> signInMan,
                             Microsoft.AspNetCore.Identity.UserManager<InventoryUser> userMan) {
        _logger = logger;
        _context = context;
        _cache = cache;
        _userMan = userMan;
        _signInMan = signInMan;
    }

    #endregion

    #region API Methods
    [HttpGet, Authorize(Roles = "Client, Administrateur")]
    public async Task<ActionResult<List<InvoiceModel>>> Get(bool? all = false) {
        IList<string> roles;
        string id;
        try { // Trouver les rôles de l'utilisateur, assumer non-admin si impossible à trouver.
            var user = await _userMan.GetUserAsync(_signInMan.Context.User);
            roles = await _userMan.GetRolesAsync(user);
        }
        catch (Exception e) {
            _logger.LogError(10, e.Message);
            roles = new List<string>();
        }

        try {
            id = _signInMan.Context.User.Identity.GetUserId();
            if (all is not null && all == true && roles.Contains("Administrateur"))
                return Ok(_context.Invoices
                    .Include("ShippingAddress")
                    .Include(x => x.Products)
                    .ThenInclude(y => y.Product)
                    .ToList());

            else
                return Ok(_context.Invoices
                    .Include("ShippingAddress")
                    .Include(x => x.Products)
                    .ThenInclude(y => y.Product)
                    .Where(x => x.LinkedAccount != null && x.LinkedAccount.Id == id).ToList());
        }
        catch (Exception e) {
            _logger.LogError(10, e.Message);
            return BadRequest();
        }
    }

    [HttpGet("{id}"), Authorize(Roles = "Client, Administrateur")]
    public async Task<ActionResult<InvoiceModel>> Get(int id) {
        IList<string> roles;
        InvoiceModel inv;

        try { // Trouver les rôles de l'utilisateur, assumer non-admin si impossible à trouver.
            roles = await _userMan.GetRolesAsync(await _userMan.GetUserAsync(_signInMan.Context.User));
        }
        catch (Exception e) {
            _logger.LogError(10, e.Message);
            roles = new List<string>();
        }

        try {
            inv = _context.Invoices.Where(x => x.Id == id).Include("ShippingAddress").First();
        }
        catch (Exception e) {
            _logger.LogError(10, e.Message);
            return BadRequest();
        }

        if (roles.Contains("Administrateur") ||
            (inv.LinkedAccount is not null &&
            inv.LinkedAccount.Id == _signInMan.Context.User.Identity.GetUserId()))
            return inv;
        else return Unauthorized();
    }

    [HttpPost, AllowAnonymous]
    public async Task<ActionResult<InvoiceModel>> Post(SendInvoiceModel sinv) {
        var user = await _userMan.GetUserAsync(_signInMan.Context.User);
        var prodcom = sinv.ProdQuant;
        Dictionary<int, uint> badprods = new();
        List<ProductModel> prods;
        InvoiceModel inv = new() {
            FirstName = sinv.FirstName,
            LastName = sinv.LastName,
            EmailAddress = sinv.EmailAddress,
            PhoneNumber = sinv.PhoneNumber,
            PurchaseDate = DateTime.Now
        };
        AddressModel ad = _context.Addresses.FirstOrDefault(x => x.CivicNumber == sinv.CivicNumber &&
                                                        x.Appartment == sinv.Appartment &&
                                                        x.Street == sinv.Street &&
                                                        x.City == sinv.City &&
                                                        x.Province == sinv.Province &&
                                                        x.Country == sinv.Country) ??
                                                        new() {
                                                            CivicNumber = sinv.CivicNumber,
                                                            Appartment = sinv.Appartment,
                                                            Street = sinv.Street,
                                                            City = sinv.City,
                                                            Province = sinv.Province,
                                                            Country = sinv.Country,
                                                            PostalCode = sinv.PostalCode
                                                        };
        inv.ShippingAddress = ad;
        if (user is not null)
            inv.LinkedAccount = user;

        try {
            prods = _context.Products.Where(x => sinv.ProdQuant.Select(x => x.Key).Contains(x.Id)).ToList();
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return BadRequest();
        }

        if (prods.Count == 0)
            return BadRequest("Vous devez inclure au moins un produit à votre commande.");

        foreach (var prod in sinv.ProdQuant) { // Update de quantités dans l'inventaire.
            ProductModel inventProd = prods.Where(x => x.Id == prod.Key).First();
            if (inventProd.Quantity > prod.Value)
                badprods.Add(prod.Key, prod.Value);
            if (inventProd.Quantity == prod.Value) {
                inventProd.Quantity = 0;
                inventProd.Status = inventProd.Status == ProductModel.States.Clearance ?
                                                         ProductModel.States.Discontinued :
                                                         ProductModel.States.BackOrder;
            }
            else inventProd.Quantity -= prod.Value;
            inventProd.LastSale = DateTime.Now;
            inventProd.Sales += prod.Value;
        }

        if (badprods.Count > 0) // Retour des produits non-achetable avec l'inventaire restant.
            return BadRequest(badprods.ToArray());

        try { // Faire les updates dans la BD.
            _context.Addresses.Add(ad);
            _context.Invoices.Add(inv);
            _context.Products.UpdateRange(prods);
            _context.SaveChanges();
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return BadRequest(e.InnerException.Message);
        }

        _cache.askForRefresh();
        return Ok(inv);
    }

    [HttpPost("Cancel/{id}"), Authorize(Roles = "Client, Administrateur")]
    public async Task<ActionResult<InvoiceModel>> Cancel(int id) {
        InvoiceModel inv;
        IList<string> roles;

        try { // Trouver la commande.
            inv = _context.Invoices.Where(x => x.Id == id)
                                   .Include("Product").First();
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return BadRequest();
        }

        try { // Trouver les rôles de l'utilisateur, assumer non-admin si impossible à trouver.
            roles = await _userMan.GetRolesAsync(await _userMan.GetUserAsync(_signInMan.Context.User));
        }
        catch (Exception e) {
            _logger.LogError(10, e.Message);
            roles = new List<string>();
        }

        // Pour ne pas pouvoir arbitrairement annuler la commande d'un autre client en tant que client.
        if (!((inv.LinkedAccount is not null &&
             inv.LinkedAccount.Id == _signInMan.Context.User.Identity.GetUserId()) ||
             roles.Contains("Administrateur")))
            return Unauthorized();

        if (inv.Status == InvoiceModel.InStates.Cancelled ||
            inv.Status == InvoiceModel.InStates.Returned)
            return BadRequest("La commande à déjà été annulée.");

        if (inv.Status == InvoiceModel.InStates.Shipped)
            return BadRequest("Il est trop tard pour annuler votre commande, veuillez contacter le service à la clientèle pour retourner la commande.");

        inv.Status = InvoiceModel.InStates.Cancelled;

        foreach (var prod in inv.Products) { // Revert l'inventaire.
            if (prod.Product.Quantity == 0)
                if (prod.Product.Status == ProductModel.States.Discontinued)
                    prod.Product.Status = ProductModel.States.Clearance;
                else prod.Product.Status = ProductModel.States.Available;
            prod.Product.Quantity = prod.Product.Quantity + prod.Quantity;
            prod.Product.Sales -= prod.Quantity;
        }

        try {
            _context.Update(inv);
            _context.SaveChanges();
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return BadRequest();
        }

        _cache.askForRefresh();
        return Ok(inv);
    }

    #endregion
}