using Microsoft.Extensions.Options;

namespace StopShopping.FileApi.Services.Implementions;

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

    private readonly IWebHostEnvironment _env;
    private readonly AppOptions _appOptions;

    public async Task<ApiResponse<FileUploadResp>> 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);

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

        return new ApiResponse<FileUploadResp>(result);
    }

    private string GetFileUrl(UploadScences scences, string fileName)
    {
        return $"{_appOptions.Domain}/{GetRelativeToRootPath(scences, fileName)
            .Replace(Path.DirectorySeparatorChar, '/')}";
    }

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