using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Web;
using System.Web.Hosting;
using System.Xml.Linq;
using HtmlAgilityPack;
using Orchard.Specs.Hosting;
using Orchard.Specs.Util;
using TechTalk.SpecFlow;
using NUnit.Framework;

namespace Orchard.Specs.Bindings {
    [Binding]
    public class WebAppHosting {
        private WebHost _webHost;
        private RequestDetails _details;
        private HtmlDocument _doc;
        private MessageSink _messages;

        [Given(@"I have a clean site")]
        public void GivenIHaveACleanSite() {
            _webHost = new WebHost();
            _webHost.Initialize("Orchard.Web", "/");

            var sink = new MessageSink();
            _webHost.Execute(() => {
                HostingTraceListener.SetHook(msg => sink.Receive(msg));
            });
            _messages = sink;
        }

        public class MessageSink : MarshalByRefObject {
            readonly IList<string> _messages = new List<string>();

            public void Receive(string message) {
                _messages.Add(message);
            }
        }


        [Given(@"I have module ""(.*)""")]
        public void GivenIHaveModule(string moduleName) {
            _webHost.CopyExtension("Modules", moduleName);
        }

        [Given(@"I have theme ""(.*)""")]
        public void GivenIHaveTheme(string themeName) {
            _webHost.CopyExtension("Themes", themeName);
        }

        [Given(@"I have core ""(.*)""")]
        public void GivenIHaveCore(string moduleName) {
            _webHost.CopyExtension("Core", moduleName);
        }

        [Given(@"I have a clean site with")]
        public void GivenIHaveACleanSiteWith(Table table) {
            GivenIHaveACleanSite();
            foreach (var row in table.Rows) {
                foreach (var name in row["names"].Split(',').Select(x => x.Trim())) {
                    switch (row["extension"]) {
                        case "core":
                            GivenIHaveCore(name);
                            break;
                        case "module":
                            GivenIHaveModule(name);
                            break;
                        case "theme":
                            GivenIHaveTheme(name);
                            break;
                        default:
                            Assert.Fail("Unknown extension type {0}", row["extension"]);
                            break;
                    }
                }
            }
        }

        [Given(@"I am on ""(.*)""")]
        public void GivenIAmOn(string urlPath) {
            WhenIGoTo(urlPath);
        }


        [When(@"I go to ""(.*)""")]
        public void WhenIGoTo(string urlPath) {
            _details = _webHost.SendRequest(urlPath);
            _doc = new HtmlDocument();
            _doc.Load(new StringReader(_details.ResponseText));
        }

        [When(@"I follow ""(.*)""")]
        public void WhenIFollow(string linkText) {
            var link = _doc.DocumentNode
                .SelectNodes("//a")
                .Single(elt => elt.InnerText == linkText);

            var urlPath = link.Attributes["href"].Value;

            WhenIGoTo(urlPath);
        }

        [When(@"I fill in")]
        public void WhenIFillIn(Table table) {
            var inputs = _doc.DocumentNode
                .SelectNodes("//input") ?? Enumerable.Empty<HtmlNode>();

            foreach (var row in table.Rows) {
                var r = row;
                var input = inputs.SingleOrDefault(x => x.GetAttributeValue("name", x.GetAttributeValue("id", "")) == r["name"]);
                Assert.That(input, Is.Not.Null, "Unable to locate <input> name {0} in page html:\r\n\r\n{1}", r["name"], _details.ResponseText);
                input.Attributes.Add("value", row["value"]);
            }
        }

        [When(@"I hit ""(.*)""")]
        public void WhenIHit(string submitText) {
            var submit = _doc.DocumentNode
                .SelectNodes("//input[@type='submit']")
                .Single(elt => elt.GetAttributeValue("value", null) == submitText);

            var form = Form.LocateAround(submit);
            var urlPath = form.Start.GetAttributeValue("action", _details.UrlPath);
            var inputs = form.Children
                    .SelectMany(elt => elt.DescendantsAndSelf("input"))
                    .GroupBy(elt => elt.GetAttributeValue("name", elt.GetAttributeValue("id", "")), elt => elt.GetAttributeValue("value", ""))
                    .ToDictionary(elt => elt.Key, elt => (IEnumerable<string>)elt);

            _details = _webHost.SendRequest(urlPath, inputs);
            _doc = new HtmlDocument();
            _doc.Load(new StringReader(_details.ResponseText));
        }


        [Then(@"the status should be (.*) (.*)")]
        public void ThenTheStatusShouldBe(int statusCode, string statusDescription) {
            Assert.That(_details.StatusCode, Is.EqualTo(statusCode));
            Assert.That(_details.StatusDescription, Is.EqualTo(statusDescription));
        }

        [Then(@"I should see ""(.*)""")]
        public void ThenIShouldSee(string text) {
            Assert.That(_details.ResponseText, Is.StringContaining(text));
        }

        [Then(@"the title contains ""(.*)""")]
        public void ThenTheTitleContainsText(string text) {
            ScenarioContext.Current.Pending();
        }
    }

    public class Form {
        public static Form LocateAround(HtmlNode cornerstone) {
            foreach (var inspect in cornerstone.AncestorsAndSelf()) {

                var form = inspect.PreviousSiblingsAndSelf().FirstOrDefault(
                    n => n.NodeType == HtmlNodeType.Element && n.Name == "form");
                if (form == null)
                    continue;

                var endForm = inspect.NextSiblingsAndSelf().FirstOrDefault(
                    n => n.NodeType == HtmlNodeType.Text && n.InnerText == "</form>");
                if (endForm == null)
                    continue;

                return new Form {
                    Start = form,
                    End = endForm,
                    Children = form.NextSibling.NextSiblingsAndSelf().TakeWhile(n => n != endForm).ToArray()
                };
            }

            return null;
        }


        public HtmlNode Start { get; set; }
        public HtmlNode End { get; set; }
        public IEnumerable<HtmlNode> Children { get; set; }
    }

    static class HtmlExtensions {
        public static IEnumerable<HtmlNode> PreviousSiblingsAndSelf(this HtmlNode node) {
            var scan = node;
            while (scan != null) {
                yield return scan;
                scan = scan.PreviousSibling;
            }
        }
        public static IEnumerable<HtmlNode> NextSiblingsAndSelf(this HtmlNode node) {
            var scan = node;
            while (scan != null) {
                yield return scan;
                scan = scan.NextSibling;
            }
        }
    }
}