using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using Volo.Docs.Documents;
using Volo.Docs.Formatting;
using Volo.Docs.Projects;

namespace Volo.Docs.Pages.Documents.Project
{
    public class IndexModel : PageModel
    {
        [BindProperty(SupportsGet = true)]
        public string ProjectName { get; set; }

        [BindProperty(SupportsGet = true)]
        public string Version { get; set; } = "";

        [BindProperty(SupportsGet = true)]
        public string DocumentName { get; set; }

        public string ProjectFormat { get; set; }

        public string DocumentNameWithExtension { get; private set; }

        public DocumentWithDetailsDto Document { get; private set; }

        public List<VersionInfo> Versions { get; private set; }

        public List<SelectListItem> VersionSelectItems => Versions.Select(v => new SelectListItem
        {
            Text = v.DisplayText,
            Value = "/documents/" + ProjectName + "/" + v.Version + "/" + DocumentName,
            Selected = v.IsSelected
        }).ToList();

        public NavigationWithDetailsDto Navigation { get; private set; }

        private readonly IDocumentAppService _documentAppService;
        private readonly IDocumentConverterFactory _documentConverterFactory;
        private readonly IProjectAppService _projectAppService;

        public IndexModel(IDocumentAppService documentAppService, IDocumentConverterFactory documentConverterFactory, IProjectAppService projectAppService)
        {
            _documentAppService = documentAppService;
            _documentConverterFactory = documentConverterFactory;
            _projectAppService = projectAppService;
        }

        public VersionInfo LatestVersionInfo
        {
            get
            {
                var latestVersion = Versions.First();

                latestVersion.DisplayText = $"{latestVersion.Version} - " + DocsAppConsts.LatestVersion;
                latestVersion.Version = latestVersion.Version;

                return latestVersion;
            }
        }

        public async Task OnGet()
        {
            var projectDto = await _projectAppService.FindByShortNameAsync(ProjectName);

            ProjectFormat = projectDto.Format;

        
            DocumentNameWithExtension = DocumentName + "." + projectDto.Format;

            var versions = await _documentAppService.GetVersions(projectDto.ShortName, projectDto.DefaultDocumentName,
                projectDto.ExtraProperties, projectDto.DocumentStoreType, DocumentNameWithExtension);

            Versions = versions.Select(v => new VersionInfo(v, v)).ToList();

            if (string.Equals(Version, DocsAppConsts.LatestVersion, StringComparison.OrdinalIgnoreCase))
            {
                LatestVersionInfo.IsSelected = true;
                Version = LatestVersionInfo.Version;
            }
            else
            {
                var versionFromUrl = Versions.FirstOrDefault(v => v.Version == Version);
                if (versionFromUrl != null)
                {
                    versionFromUrl.IsSelected = true;
                    Version = versionFromUrl.Version;
                }
                else
                {
                    Versions.First().IsSelected = true;
                    Version = Versions.First().Version;
                }
            }

            Document = await _documentAppService.GetByNameAsync(ProjectName, DocumentNameWithExtension, Version, true);
            var converter = _documentConverterFactory.Create(Document.Format ?? projectDto.Format);
            var content = converter.NormalizeLinks(Document.Content, Document.Project.ShortName, Document.Version, Document.LocalDirectory);
            content = converter.Convert(content);

            content = HtmlNormalizer.ReplaceImageSources(content, Document.RawRootUrl, Document.LocalDirectory);
            content = HtmlNormalizer.ReplaceCodeBlocksLanguage(content, "language-C#", "language-csharp"); //todo find a way to make it on client in prismJS configuration (eg: map C# => csharp)
            Document.Content = content;

            Navigation = await _documentAppService.GetNavigationDocumentAsync(ProjectName, Version, false);
            Navigation.ConvertItems();

        }

    }
}