using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using Esprima;
using Esprima.Ast;
using Jint.Runtime;
using Newtonsoft.Json.Linq;
using Xunit;
using Xunit.Abstractions;

namespace Jint.Tests.Ecma
{
    public class Chapter6 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 6")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch06", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch06", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter7 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 7")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch07", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch07", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter8 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 8")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch08", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch08", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter9 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 9")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch09", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch09", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter10 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 10")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch10", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch10", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter11 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 11")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch11", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch11", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter12 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 12")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch12", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch12", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter13 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 13")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch13", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch13", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter14 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 14")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch14", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch14", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public class Chapter15 : EcmaTest
    {
        // couple of tests are really slow, run in parallel
        internal const string SlowTest1 = "ch15/15.1/15.1.3/15.1.3.1/S15.1.3.1_A2.5_T1.js";
        internal const string SlowTest2 = "ch15/15.1/15.1.3/15.1.3.1/S15.1.3.1_A2.5_T1.js";

        [Theory(DisplayName = "Ecma Chapter 15")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch15", false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {"ch15", true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            if (sourceFile.Source == SlowTest1 || sourceFile.Source == SlowTest2)
            {
                return;
            }
            
            RunTestInternal(sourceFile);
        }
    }
    
    public class Chapter15_SlowTest1 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 15 Slow Test 1")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {Chapter15.SlowTest1, false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {Chapter15.SlowTest1, true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }
        
    public class Chapter15_SlowTest2 : EcmaTest
    {
        [Theory(DisplayName = "Ecma Chapter 15 Slow Test 2")]
        [MemberData(nameof(SourceFiles), parameters: new object[] {Chapter15.SlowTest2, false })]
        [MemberData(nameof(SourceFiles), parameters: new object[] {Chapter15.SlowTest2, true }, Skip = "Skipped")]
        protected void RunTest(SourceFile sourceFile)
        {
            RunTestInternal(sourceFile);
        }
    }

    public abstract class EcmaTest
    {
        private static string _lastError;
        private static Script staSource;
        private static readonly string BasePath;
        private static readonly List<SourceFile> _sourceFiles = new List<SourceFile>(10_000);
        private static readonly TimeZoneInfo _pacificTimeZone;

        static EcmaTest()
        {
            try
            {
                _pacificTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
            }
            catch (TimeZoneNotFoundException)
            {
                // https://stackoverflow.com/questions/47848111/how-should-i-fetch-timezoneinfo-in-a-platform-agnostic-way
                // should be natively supported soon https://github.com/dotnet/runtime/issues/18644
                _pacificTimeZone = TimeZoneInfo.FindSystemTimeZoneById("America/Los_Angeles");
            }

            var assemblyPath = new Uri(typeof(EcmaTest).GetTypeInfo().Assembly.Location).LocalPath;
            var assemblyDirectory = new FileInfo(assemblyPath).Directory;
            BasePath = assemblyDirectory.Parent.Parent.Parent.FullName;

            var localPath = assemblyDirectory.Parent.Parent.Parent.FullName;

            var fixturesPath = Path.Combine(localPath, "TestCases/alltests.json");

            var content = File.ReadAllText(fixturesPath);
            var doc = JArray.Parse(content);
            var path = Path.Combine(localPath, "TestCases");

            foreach (var jToken in doc)
            {
                _sourceFiles.Add(new SourceFile((JObject) jToken, path));
            }
        }

        protected void RunTestInternal(SourceFile sourceFile)
        {
            var fullName = Path.Combine(BasePath, sourceFile.BasePath, sourceFile.Source);
            if (!File.Exists(fullName))
            {
                throw new ArgumentException("Could not find source file: " + fullName);
            }

            string code = File.ReadAllText(fullName);
            var negative = code.Contains("@negative");

            RunTestCode(code, negative);
        }

        protected void RunTestCode(string code, bool negative)
        {
            _lastError = null;

            //NOTE: The Date tests in test262 assume the local timezone is Pacific Standard Time
            var engine = new Engine(cfg => cfg
                .LocalTimeZone(_pacificTimeZone)
            );

            // loading driver
            if (staSource == null)
            {
                var driverFilename = Path.Combine(BasePath, "TestCases/sta.js");
                var source = File.ReadAllText(driverFilename);
                staSource = new JavaScriptParser(source, new ParserOptions("sta.js")).ParseScript();
            }

            engine.Execute(staSource);

            if (negative)
            {
                try
                {
                    engine.Execute(code);
                    Assert.True(_lastError != null);
                    Assert.False(true);
                }
                catch
                {
                    // exception is expected
                }

            }
            else
            {
                try
                {
                    engine.Execute(code);
                }
                catch (JavaScriptException j)
                {
                    _lastError = TypeConverter.ToString(j.Error);
                }
                catch (Exception e)
                {
                    _lastError = e.ToString();
                }

                Assert.Null(_lastError);
            }
        }

        public static IEnumerable<object[]> SourceFiles(string prefix, bool skipped)
        {
            var results = new List<object[]>();
            foreach(var sourceFile in _sourceFiles)
            {
                if (prefix != null && !sourceFile.Source.StartsWith(prefix))
                {
                    continue;
                }

                if (sourceFile.Skip
                    && (sourceFile.Reason == "part of new test suite"
                        || sourceFile.Reason.IndexOf("configurable", StringComparison.OrdinalIgnoreCase) > -1))
                {
                    // we consider this obsolete and we don't need to process at all
                    continue;
                }

                if (skipped == sourceFile.Skip)
                {
                    results.Add(new object [] { sourceFile });
                }
            }

            return results;
        }

        public class SourceFile : IXunitSerializable
        {
            public SourceFile()
            {
            }

            public SourceFile(JObject node, string basePath)
            {
                Skip = node["skip"].Value<bool>();
                Source = node["source"].ToString();
                Reason = node["reason"].ToString();
                BasePath = basePath;
            }

            public string Source { get; set; }
            public bool Skip { get; set; }
            public string Reason { get; set; }
            public string BasePath { get; set; }

            public void Deserialize(IXunitSerializationInfo info)
            {
                Skip = info.GetValue<bool>(nameof(Skip));
                Source = info.GetValue<string>(nameof(Source));
                Reason = info.GetValue<string>(nameof(Reason));
                BasePath = info.GetValue<string>(nameof(BasePath));
            }

            public void Serialize(IXunitSerializationInfo info)
            {
                info.AddValue(nameof(Skip), Skip);
                info.AddValue(nameof(Source), Source);
                info.AddValue(nameof(Reason), Reason);
                info.AddValue(nameof(BasePath), BasePath);
            }

            public override string ToString()
            {
                return Source;
            }
        }
    }
}