using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.DataProtection;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using NuGet.Packaging.Core;
using nuget_host.Data;
using nuget_host.Entities;
using nuget_host.Helpers;

namespace nuget_host.Controllers
{

    [AllowAnonymous]
    public class PackagesController : Controller
    {
        private readonly ILogger<PackagesController> logger;
        private readonly IDataProtector protector;

        private readonly NugetSettings nugetSettings;
        ApplicationDbContext dbContext;

        public PackagesController(
            ILoggerFactory loggerFactory,
            IDataProtectionProvider provider,
            IOptions<NugetSettings> nugetOptions,
            ApplicationDbContext dbContext)
        {
            logger = loggerFactory.CreateLogger<PackagesController>();
            nugetSettings = nugetOptions.Value;
            protector = provider.CreateProtector(nugetSettings.ProtectionTitle);
            this.dbContext = dbContext;
        }

        [HttpPut("packages")]
        public async Task<IActionResult> Put()
        {
            try
            {


                var clientVersionId = Request.Headers["X-NuGet-Client-Version"];
                var apiKey = Request.Headers["X-NuGet-ApiKey"];
                ViewData["versionId"] = typeof(PackagesController).Assembly.FullName;
                var files = new List<string>();
                ViewData["files"] = files;

                var clearkey = protector.Unprotect(apiKey);
                var apikey = dbContext.ApiKeys.SingleOrDefault(k => k.Id == clearkey);
                if (apikey == null)
                {
                    logger.LogInformation("403 : no api-key");
                    return Unauthorized();
                }

                foreach (var file in Request.Form.Files)
                {
                    string initpath = Path.Combine(Environment.GetEnvironmentVariable("TEMP") ??
                    Environment.GetEnvironmentVariable("TMP") ?? "/tmp",
                     $"nuget_host-{Guid.NewGuid()}.nupkg");

                    using (FileStream fw = new FileStream(initpath, FileMode.Create))
                    {
                        file.CopyTo(fw);
                    }

                    using (FileStream fw = new FileStream(initpath, FileMode.Open))
                    {
                        var archive = new ZipArchive(fw);

                        foreach (var entry in archive.Entries)
                        {
                            if (entry.FullName.EndsWith(".nuspec"))
                            {
                                // var entry = archive.GetEntry(filename);
                                var specstr = entry.Open();
                                NuGet.Packaging.Core.NuspecCoreReader reader = new NuspecCoreReader(specstr);

                                string pkgdesc = reader.GetDescription();
                                string pkgid = reader.GetId();
                                var version = reader.GetVersion();
                                string pkgidpath = Path.Combine(nugetSettings.PackagesRootDir,
                                    pkgid);
                                string pkgpath = Path.Combine(pkgidpath, version.Version.ToString());
                                string name = $"{pkgid}-{version}.nupkg";
                                string fullpath = Path.Combine(pkgpath, name);


                                var source = new FileInfo(initpath);
                                var dest = new FileInfo(fullpath);
                                var destdir = new DirectoryInfo(dest.DirectoryName);
                                if (dest.Exists)
                                {
                                    ViewData["error"] = "existe déjà";
                                    logger.LogInformation("400 : existe déjà");
                                    return BadRequest(ViewData);
                                }


                                destdir.Create();
                                source.MoveTo(fullpath);
                                files.Add(name);
                                var newpkg = new Package
                                {
                                    Id = pkgid,
                                    Description = pkgdesc,
                                    OwnerId = apikey.UserId
                                };
                                dbContext.Packages.Add(newpkg);

                                var newversion = new PackageVersion
                                {
                                    Package = newpkg,
                                    Major = version.Major,
                                    Minor = version.Minor,
                                    Patch = version.Patch,
                                    IsPrerelease = version.IsPrerelease,
                                    FullString = version.ToFullString()
                                };
                                dbContext.PackageVersions.Add(newversion);

                                await dbContext.SaveChangesAsync();
                                logger.LogInformation($"new package : {entry.Name}");
                               
                                   
                            }
                        }
                    }

                }
                return Ok(ViewData);
            }
            catch (Exception ex)
            {
                return new ObjectResult(new { ViewData, ex.Message, ex.StackTrace })
                { StatusCode = 500 };
            }
        }

        [HttpGet("packages/{spec}")]
        public IActionResult Index(string spec)
        {
            if (string.IsNullOrEmpty(spec))
            {
                ViewData["warn"] = "no spec";
            }
            else
            {
                ViewData["spec"] = spec;
                // TODO Assert valid sem ver spec
                var filelst = new DirectoryInfo(nugetSettings.PackagesRootDir);
                var fi = new FileInfo(spec);
                var lst = filelst.GetDirectories(spec);
                ViewData["lst"] = lst.Select(entry => entry.Name);
            }
            return Ok(ViewData);
        }



        [Authorize]
        [HttpGet("api/get-key/{*apikey}")]
        public IActionResult GetApiKey(string apiKey)
        {
            return Ok(protector.Protect(apiKey));
        }
    }
}