using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Options;
using StopShopping.Services.Extensions;
using StopShopping.Services.Models;
using StopShopping.Services.Models.Req;
using StopShopping.Services.Models.Resp;

namespace StopShopping.Services.Implementions;

public class FileService : IFileService
{
    public FileService(IOptions<AppOptions> appOptions,
        IWebHostEnvironment webHostEnvironment)
    {
        _appOptions = appOptions.Value;
        _env = webHostEnvironment;
    }

    private readonly AppOptions _appOptions;
    private readonly IWebHostEnvironment _env;

    public async Task<ApiResponse<FileUpload>> UploadFileAsync(UploadParams payload)
    {
        var newName = Guid.NewGuid().ToString("N").ToLower();
        var extension = Path.GetExtension(payload.File!.FileName);
        var newFullName = $"{newName}{extension}";
        var relativeToRootPath = GetRelativeToRootPath(payload.Scences, newFullName);
        var targetPath = Path.Combine(_env.WebRootPath, GetRelativeToRootPath(payload.Scences));

        if (!Directory.Exists(targetPath))
        {
            Directory.CreateDirectory(targetPath);
        }

        using var file = new FileStream(
            Path.Combine(_env.WebRootPath, relativeToRootPath),
            FileMode.CreateNew,
            FileAccess.Write);

        await payload.File.CopyToAsync(file);

        FileUpload result = new()
        {
            NewName = newFullName,
            Url = GetFileUrl(payload.Scences, newFullName)
        };

        return new ApiResponse<FileUpload>(result);
    }

    public string GetFileUrl(UploadScences scences, string fileName)
    {
        var relativeToRootPath = GetRelativeToRootPath(scences, fileName);

        return $"{_appOptions.DomainPath}/{relativeToRootPath.Replace(Path.DirectorySeparatorChar, '/')}";
    }

    private string GetRelativeToRootPath(UploadScences scences, string fileName = "")
    {
        return Path.Combine(
            "images",
            scences.GetTargetDirectory(),
            fileName);
    }
}