namespace GrossesMitainesAPI.Controllers;

#region Dependencies
using GrossesMitainesAPI.Models;
using System.Linq;
using GrossesMitainesAPI.Data;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.Authorization;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Cors;
using Microsoft.AspNetCore.Mvc;
using GrossesMitainesAPI.Services;
using System.Drawing;
using System.IO;
using Microsoft.EntityFrameworkCore.Storage;
using Microsoft.AspNetCore.Routing;
#endregion

/// <summary>
/// Ce contrôleur ne va pas chercher dans la cache,
/// mais les changements dans celui-ci entrainera
/// une demande de mise à jour dans cette dernière 
/// qui sera effectuée dans les 10 secondes après
/// l'éxécution d'une modification de la BD.
/// </summary>
[EnableCors("_myAllowSpecificOrigins"), ApiController, Route("api/[controller]"),
 Authorize(AuthenticationSchemes = "Identity.Application", Roles = "Administrateur")]
public class ProductController : ControllerBase {
    #region DI Fields
    private readonly ILogger<ProductController> _logger;
    private readonly InventoryContext _context;
    private readonly DatabaseCacheService _cache;
    private readonly IWebHostEnvironment _hostEnvironment;

    #endregion
    
    #region Ctor
    public ProductController(ILogger<ProductController> logger, InventoryContext context, DatabaseCacheService cache, IWebHostEnvironment hostEnvironment) {
        _logger = logger;
        _context = context;
        _cache = cache;
        _hostEnvironment = hostEnvironment;
    }

    #endregion

    #region API Methods
    [EnableCors("_myAllowSpecificOrigins"), HttpGet("Quantity"), AllowAnonymous]
    public ActionResult<uint> ProdCount(int id) {
        return _context.Products.FirstOrDefault(x => x.Id == id).Quantity;
    }

    [EnableCors("_myAllowSpecificOrigins"), HttpGet(), AllowAnonymous]
    public ActionResult<ProductViewModel> Get(int id) {
        ProductModel prod;
        try {
            prod = _context.Products.Where(x => x.Id == id).First();
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return NotFound();
        }
        _cache.addHit((uint)id);
        return new ProductViewModel(prod);
    }

    [EnableCors("_myAllowSpecificOrigins"), HttpPost()]
    public async Task<ActionResult<ProductModel>> Post([FromForm] ProductModel prod) {
        if (prod.Price <= prod.PromoPrice)
            prod.PromoPrice = prod.Price - 0.01M;
        try {
            if (prod.ImageFile != null)
                prod.ImageName = await SaveImage(prod.ImageFile);

            _context.Products.Add(prod);
            _context.SaveChanges();
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return BadRequest(e.Message);
        }
        _cache.askForRefresh();
        return prod;
    }

    [EnableCors("_myAllowSpecificOrigins"), HttpPatch()]
    public async Task<ActionResult<ProductModel>> Patch([FromForm] ProductModel prod) {
        string? oldImage = "";
        if (prod.Price <= prod.PromoPrice)
            prod.PromoPrice = prod.Price - 0.01M;
        try {
            if (prod.ImageFile is not null) {
                oldImage = prod.ImageName;
                prod.ImageName = await SaveImage(prod.ImageFile);
            }

            _context.Products.Update(prod);
            _context.SaveChanges();
            if (oldImage is not null and not "")
                DeleteImages(oldImage);
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return BadRequest(e.Message);
        }
        _cache.askForRefresh();
        return prod;
    }

    [EnableCors("_myAllowSpecificOrigins"), HttpDelete()]
    public ActionResult<int> Delete(int id) {
        try {
            var prod = _context.Products.Where(x => x.Id == id).First();
            string imageName = prod.ImageName;
            _context.Products.Remove(prod);
            _context.SaveChanges();
            DeleteImages(imageName);
        }
        catch (Exception e) {
            _logger.LogError(8, e.Message);
            return BadRequest(e.Message);
        }
        _cache.askForRefresh();
        return id;
    }

    #endregion

    #region Internal Methods
    private async Task<string> SaveImage(IFormFile imageFile) {
        string imageName = new String(Path.GetFileNameWithoutExtension(imageFile.FileName).Take(10).ToArray()).Replace(' ', '-').Replace("$","");
        imageName = imageName + DateTime.Now.ToString("yymmssfff") + Path.GetExtension(imageFile.FileName);
        var imagePath = Path.Combine(_hostEnvironment.ContentRootPath, "Images", imageName);

        using (var fileStream = new FileStream(imagePath, FileMode.Create)) {
            await imageFile.CopyToAsync(fileStream);
            SaveImageThumbnail(fileStream, imageName);
        }
        return imageName;
    }

    private void SaveImageThumbnail(FileStream stream, string imageName) {
        try {
            const float maxSize = 300f;
            Image image = Image.FromStream(stream);

            //Choisi le bon ratio de division pour ne pas dépasser le 300px ni dans height ni dans width
            float ratio = image.Width / (image.Height / maxSize) <= maxSize ? image.Height / maxSize : image.Width / maxSize;

            Bitmap resize = new Bitmap(image, new Size((int)(image.Width / ratio), (int)(image.Height / ratio)));
            string path = Path.Combine(_hostEnvironment.ContentRootPath, "Images", Path.GetFileNameWithoutExtension(imageName) + "_thumbnail" + Path.GetExtension(imageName));
            resize.Save(path);
        }
        catch (Exception ex) {
            _logger.LogError(8, ex.Message);
        }
    }

    private void DeleteImages(string imageName) {

        if (imageName == "default.jpg" || imageName == "default_thumbnail.jpg" || imageName.Contains("$"))
            return;

        var files = System.IO.Directory.GetFiles(_hostEnvironment.ContentRootPath + "/Images")
                                       .Where(x => x.Contains(Path.GetFileNameWithoutExtension(imageName))).ToArray();

        foreach (var file in files) 
            System.IO.File.Delete(file);
    }

    #endregion
}