using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using SeaHaven.Services.Interfaces;

namespace Api.SeaHavenIndustries.Infrastructure
{
    public class FileStorageAdapter : IFileStoragePort
    {
        private readonly IWebHostEnvironment _webHostEnvironment;
        private readonly IHttpContextAccessor _httpContext;

        public FileStorageAdapter(IWebHostEnvironment webHostEnvironment, IHttpContextAccessor httpContext)
        {
            _webHostEnvironment = webHostEnvironment;
            _httpContext = httpContext;
        }

        public async Task<string> SaveFileAsync(IFormFile file)
        {
            var fileName = Path.GetFileName(file.FileName);
            if (string.IsNullOrWhiteSpace(fileName))
                throw new InvalidDataException("The uploaded file must have a valid name.");

            var uniqueFileName = $"{Guid.NewGuid()}_{fileName}";
            var uploadPath = Path.Combine("Assets", "Documents");
            var webRoot = ResolveWebRoot();
            var fullPath = Path.Combine(webRoot, uploadPath, uniqueFileName);

            Directory.CreateDirectory(Path.GetDirectoryName(fullPath)!);

            using (var stream = System.IO.File.Create(fullPath))
            {
                await file.CopyToAsync(stream);
            }

            var request = _httpContext.HttpContext?.Request
                ?? throw new InvalidOperationException("An active HTTP request is required to build the file URL.");
            var domain = $"{request.Scheme}://{request.Host}";
            return $"{domain}/{uploadPath.Replace("\\", "/")}/{uniqueFileName}";
        }

        public bool TryDelete(string fileUrl)
        {
            if (string.IsNullOrWhiteSpace(fileUrl))
                return false;

            try
            {
                if (!TryResolveDocumentPath(fileUrl, out var fullPath))
                    return false;

                if (!System.IO.File.Exists(fullPath))
                    return false;

                System.IO.File.Delete(fullPath);
                return true;
            }
            catch
            {
                return false;
            }
        }

        public Stream? OpenRead(string fileUrl)
        {
            if (string.IsNullOrWhiteSpace(fileUrl))
                return null;

            try
            {
                if (!TryResolveDocumentPath(fileUrl, out var fullPath))
                    return null;

                return System.IO.File.Exists(fullPath) ? System.IO.File.OpenRead(fullPath) : null;
            }
            catch
            {
                return null;
            }
        }

        private bool TryResolveDocumentPath(string fileUrl, out string fullPath)
        {
            fullPath = string.Empty;
            if (!Uri.TryCreate(fileUrl, UriKind.Absolute, out var uri))
                return false;

            var relativePath = Uri.UnescapeDataString(uri.AbsolutePath).TrimStart('/');
            if (string.IsNullOrWhiteSpace(relativePath)
                || relativePath.Contains("..", StringComparison.Ordinal)
                || !relativePath.StartsWith("Assets/Documents/", StringComparison.OrdinalIgnoreCase))
            {
                return false;
            }

            var webRoot = Path.GetFullPath(ResolveWebRoot());
            var documentsRoot = Path.GetFullPath(Path.Combine(webRoot, "Assets", "Documents"))
                .TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar)
                + Path.DirectorySeparatorChar;
            var candidatePath = Path.GetFullPath(
                Path.Combine(webRoot, relativePath.Replace('/', Path.DirectorySeparatorChar)));
            if (!candidatePath.StartsWith(documentsRoot, StringComparison.OrdinalIgnoreCase))
                return false;

            fullPath = candidatePath;
            return true;
        }

        private string ResolveWebRoot()
            => _webHostEnvironment.WebRootPath
                ?? Path.Combine(_webHostEnvironment.ContentRootPath, "wwwroot");
    }

    public class DispatchEmailAdapter : IDispatchEmailPort
    {
        private readonly Helper.SendMessage _sendMessage;

        public DispatchEmailAdapter(Helper.SendMessage sendMessage)
        {
            _sendMessage = sendMessage;
        }

        public async Task<bool> SendDispatchEmailAsync(string emailTo, string subject, string htmlBody, string? replyTo)
        {
            return await _sendMessage.SendDispatchEmail(emailTo, subject, htmlBody, replyTo);
        }
    }

    public class VendorTokenAdapter : IVendorTokenPort
    {
        private readonly IVendorPortalTokenService _tokenService;

        public VendorTokenAdapter(IVendorPortalTokenService tokenService)
        {
            _tokenService = tokenService;
        }

        public async Task<string> GetOrCreateActiveTokenAsync(int vendorId)
        {
            var token = await _tokenService.GetOrCreateActiveTokenAsync(
                vendorId, CancellationToken.None);
            return token.Token;
        }
    }

    public class VendorDocumentStorageAdapter : IVendorDocumentStoragePort
    {
        private readonly IWebHostEnvironment _environment;

        public VendorDocumentStorageAdapter(IWebHostEnvironment environment)
        {
            _environment = environment;
        }

        public async Task SaveAsync(int vendorId, int dispatchId, string storedFileName, Stream content, CancellationToken cancellationToken)
        {
            var path = Helper.VendorDocumentStorage.ResolvePath(_environment.ContentRootPath, vendorId, dispatchId, storedFileName);
            Directory.CreateDirectory(Path.GetDirectoryName(path)!);
            await using var file = File.Create(path);
            await content.CopyToAsync(file, cancellationToken);
        }

        public Stream OpenRead(int vendorId, int dispatchId, string storedFileName)
        {
            var path = Helper.VendorDocumentStorage.ResolvePath(_environment.ContentRootPath, vendorId, dispatchId, storedFileName);
            return File.OpenRead(path);
        }

        public void Delete(int vendorId, int dispatchId, string storedFileName)
        {
            var path = Helper.VendorDocumentStorage.ResolvePath(_environment.ContentRootPath, vendorId, dispatchId, storedFileName);
            if (File.Exists(path))
            {
                File.Delete(path);
            }
        }
    }
}