using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Linq;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.DataProtection;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using NuGet.Versioning;
using isnd.Data;
using isnd.Entities;
using Unleash;
using isnd.Services;
using isnd.ViewModels;
using System.Threading.Tasks;
using isnd.Interfaces;

namespace isnd.Controllers
{

    [AllowAnonymous]
    public partial class PackagesController : Controller
    {
        const int maxTake = 100;

        const string _pkgRootPrefix = "~/package";
        const string defaultSemVer = "2.0.0";
        private readonly Resource[] _ressources;
        private readonly ILogger<PackagesController> _logger;
        private readonly IDataProtector _protector;

        private readonly IsndSettings _isndSettings;
        readonly ApplicationDbContext _dbContext;
        private readonly IPackageManager _packageManager;
        private readonly IUnleash _unleashĈlient;

        public PackagesController(
            ILoggerFactory loggerFactory,
            IDataProtectionProvider provider,
            IOptions<IsndSettings> isndOptions,
            IUnleash unleashĈlient,
            ApplicationDbContext dbContext,
            IPackageManager pm)
        {
            _logger = loggerFactory.CreateLogger<PackagesController>();
            _isndSettings = isndOptions.Value;
            _protector = provider.CreateProtector(_isndSettings.ProtectionTitle);
            _dbContext = dbContext;
            _packageManager = pm;
            _unleashĈlient = unleashĈlient;
            _ressources = _packageManager.GetResources(_unleashĈlient).ToArray();
        }

        // dotnet add . package -s http://localhost:5000/packages isn
        // packages/FindPackagesById()?id='isn'&semVerLevel=2.0.0

        // Search
        // GET {@id}?q={QUERY}&skip={SKIP}&take={TAKE}&prerelease={PRERELEASE}&semVerLevel={SEMVERLEVEL}&packageType={PACKAGETYPE}


        // GET: PackageVersion
        public async Task<IActionResult> Index(PackageIndexViewModel model)
        {
            var applicationDbContext = _dbContext.Packages.Include(p => p.Versions).Where(
                p => (  model.Prerelease || p.Versions.Any(v => !v.IsPrerelease))
            && ((model.query == null) || p.Id.StartsWith(model.query)));
            model.data = await applicationDbContext.ToArrayAsync();
            return View(model);
        }

        // GET: PackageVersion/Details/5
        public async Task<IActionResult> Details(string pkgid)
        {
            if (pkgid == null)
            {
                return NotFound();
            }

            var packageVersion =  _dbContext.PackageVersions
                .Include(p => p.Package)
                .Where(m => m.PackageId == pkgid)
                .OrderByDescending(p => p)
                ;

            if (packageVersion == null)
            {
                return NotFound();
            }
            bool results = await packageVersion.AnyAsync();
            var latest = await packageVersion.FirstAsync();

            return View("Details", new PackageDetailViewModel { latest = latest, pkgid = pkgid, totalHits = packageVersion.Count(), data = packageVersion.Take(10).ToArray() } );

        }


        [HttpGet("~/index.json")]
        public IActionResult ApiIndex()
        {
            return Ok(_ressources);
        }

//
        [HttpGet(_pkgRootPrefix)]
        public IActionResult Index()
        {
                // https://docs.microsoft.com/en-us/nuget/api/catalog-resource#versioning
            return Ok(PackageManager.CurrentCatalogIndex);
        }

        // GET /autocomplete?id=isn.protocol&prerelease=true
        [HttpGet(_pkgRootPrefix + "/autocomplete")]
        public IActionResult AutoComplete(
            string id,
            string semVerLevel,
            bool prerelease = false,
            string packageType = null,
            int skip = 0,
            int take = 25)
        {
            if (take > maxTake)
            {
                ModelState.AddModelError("take", "Maximum exceeded");
                return BadRequest(ModelState);
            }
            if (semVerLevel != defaultSemVer)
            {
                ModelState.AddModelError("semVerLevel", defaultSemVer + " expected");
            }
            
            return Ok(_packageManager.AutoComplete(id,skip,take,prerelease,packageType));
        }
        // TODO GET {@id}/{LOWER_ID}/index.json 
        // LOWER_ID 	URL 	string 	yes 	The package ID, lowercased
        // response : versions 	array of strings 	yes 	The versions available
        [HttpGet(_pkgRootPrefix + "/{id}/{lower}/index.json")]
        public IActionResult GetVersions(
            string id,
            string lower,
            bool prerelease = false,
            string packageType = null,
            int skip = 0,
            int take = 25)
        {
            if (take > maxTake)
            {
                ModelState.AddModelError("take", "Maximum exceeded");
            }
            // NugetVersion
            if (!NuGetVersion.TryParse(lower, out NuGetVersion parsedVersion))
            {
                ModelState.AddModelError("lower", "invalid version string");
            }
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            return Ok(new
            {
                versions = _packageManager.GetVersions(
                    id, parsedVersion, prerelease, packageType, skip, take)
            });
        }

        // TODO GET GET {@id}/{LOWER_ID}/{LOWER_VERSION}/{LOWER_ID}.{LOWER_VERSION}.nupkg
        // LOWER_ID 	URL 	string 	yes 	The package ID, lowercase
        // LOWER_VERSION 	URL 	string 	yes 	The package version, normalized and lowercased
        // response 200 : the package
        [HttpGet(_pkgRootPrefix + "/{id}/{lower}/{idf}-{lowerf}.nupkg")]
        public IActionResult GetPackage(
           [FromRoute] string id, [FromRoute] string lower,
            [FromRoute] string idf, [FromRoute] string lowerf)
        {
            var pkgpath = Path.Combine(_isndSettings.PackagesRootDir,
            id, lower, $"{id}-{lower}.nupkg"
            );

            FileInfo pkgfi = new FileInfo(pkgpath);

            if (!pkgfi.Exists)
                {
                    return BadRequest("!pkgfi.Exists");
                }
            return File(pkgfi.OpenRead(), "application/zip; charset=binary");
        }

        // TODO GET {@id}/{LOWER_ID}/{LOWER_VERSION}/{LOWER_ID}.nuspec
        // response 200 : the nuspec
        [HttpGet(_pkgRootPrefix + "/{id}/{lower}/{idf}-{lowerf}.nuspec")]
        public IActionResult GetNuspec(
            [FromRoute][SafeName][Required] string id,
            [FromRoute][SafeName][Required] string lower,
            [FromRoute][SafeName][Required] string idf,
            [FromRoute][SafeName][Required] string lowerf)
        {
            var pkgpath = Path.Combine(_isndSettings.PackagesRootDir,
            id, lower, $"{id}.nuspec");

            FileInfo pkgfi = new FileInfo(pkgpath);
            if (!pkgfi.Exists)
                {
                    return BadRequest("!pkgfi.Exists");
                }

            return File(pkgfi.OpenRead(), "text/xml; charset=utf-8");
        }
    }
}