using System.Linq;
using System.Threading.Tasks;
using isnd.Services;
using isnd.Entities;
using Microsoft.AspNetCore.Mvc;
using System.Collections.Generic;
using NuGet.Versioning;

namespace isnd.Controllers
{
    public partial class PackagesController
    {
        // https://docs.microsoft.com/en-us/nuget/api/catalog-resource#versioning
        [HttpGet(_pkgRootPrefix + ApiConfig.Catalog)]
        public IActionResult CatalogIndex()
        {
            return Ok(PackageManager.CurrentCatalogIndex);
        }

        [HttpGet(_pkgRootPrefix + ApiConfig.CatalogPage + "-{id}")]
        public IActionResult Index(string id)
        {
            // https://docs.microsoft.com/en-us/nuget/api/catalog-resource#versioning
            return Ok(PackageManager.CurrentCatalogPages[int.Parse(id)]);
        }

        [HttpGet(_pkgRootPrefix + "{apiVersion}/" + ApiConfig.Registration
        + "/{id}/index.json")]
        public async Task<IActionResult> CatalogRegistrationAsync(string apiVersion, string id, string lower)
        {
            bool askForindex = lower == null;
            if (askForindex)
            {
                string sublower = lower.Substring(0, lower.Length - ApiConfig.IndexDotJson.Length);
                
                var pkgFromname = packageManager.SearchByName(id, 0, 1);
                if (pkgFromname == null) return NotFound();
                foreach (var item in pkgFromname.Items)
                {
                    item.Id = this.Url.Action();
                }
                return Ok(pkgFromname);
            }
            else
            {
                if (!NuGetVersion.TryParse(lower, out NuGetVersion version))
                    return BadRequest(lower);

                var pkgFromname = packageManager.GetVersions(id, version, true);
                if (pkgFromname == null) return NotFound();
                return Ok(pkgFromname);
            }
        }

        [HttpGet(_pkgRootPrefix + ApiConfig.CatalogLeaf + "/{id}/{version}/{lower}/index.json")]
        public async Task<IActionResult> CatalogLeafAsync(string id, string version, string lower)
        {
            var pkgvs = this.packageManager.GetCatalogLeaf(id, version, lower).ToArray();
            if (pkgvs.Count() == 0) return NotFound();
            List<string> types = pkgvs.Select(
                v => v.Type ?? "Dependency"
            ).Distinct().ToList();
            if (!types.Contains("PackageDelete"))
                types.Add("PackageDetails");
            var last = pkgvs.Last();
            var pub = last.LatestCommit.CommitTimeStamp;
            return Ok(new Data.Packages.Catalog.CatalogLeaf
            {
                CommitId = last.CommitId,
                Id = id,
                CommitTimeStamp = pub,
                Version = last.FullString,
                Published = pub,
                RefType = types.ToArray()
            });
        }
    }
}