//            Copyright Keysight Technologies 2012-2019
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, you can obtain one at http://mozilla.org/MPL/2.0/.
using OpenTap.Addin;
using System;
using System.Xml.Linq;

namespace OpenTap.Plugins
{
    /// <summary> Serializer implementation for TestStepList. </summary>
    internal class TestStepListSerializer : TapSerializerPlugin
    {


        /// <summary> The order of this serializer. </summary>
        public override double Order
        {
            get { return 2; }
        }
        /// <summary> Deserialization implementation. </summary>
        public override bool Deserialize(XElement elem, ITypeData t, Action<object> setResult)
        {
            if (t.IsA(typeof(TestStepList)) == false) return false;
            var steps = new TestStepList();
            var sequenceNameAttr = elem.Attribute("SequenceName");
            steps.SequenceName = sequenceNameAttr?.Value ?? string.Empty;
            foreach (var subnode in elem.Elements())
            {
                if (subnode.Name == varName)
                {
                    TestVariable v = null;
                    try
                    {
                        if (!Serializer.Deserialize(subnode, x => v = (TestVariable)x))
                        {
                            Serializer.PushError(subnode, "Unable to deserialize test step.");
                            continue; // skip to next step.
                        }
                    }
                    catch (Exception ex)
                    {
                        Serializer.PushError(subnode, "Unable to deserialize test step.", ex);
                        continue;
                    }

                    if (v != null)
                        steps.Variables.Add(v);
                }
                else
                {
                    ITestStep result = null;
                    try
                    {
                        if (!Serializer.Deserialize(subnode, x => result = (ITestStep)x))
                        {
                            Serializer.PushError(subnode, "Unable to deserialize test step.");
                            continue; // skip to next step.
                        }
                    }
                    catch (Exception ex)
                    {
                        Serializer.PushError(subnode, "Unable to deserialize test step.", ex);
                        continue;
                    }

                    if (result != null)
                        steps.Add(result);
                }
            }
            setResult(steps);
            return true;
        }

        static XName testStepName = "TestStep";
        static XName varName = "Variable";
        /// <summary> Serialization implementation. </summary>
        public override bool Serialize(XElement elem, object target, ITypeData expectedType)
        {
            if (target is TestStepList)
            {
                TestStepList list = (TestStepList)target;
                if (!string.IsNullOrEmpty(list.SequenceName))
                {
                    elem.Add(new XAttribute("SequenceName", list.SequenceName));
                }
                for (int i = 0; i < list.Count; i++)
                {
                    var item = list[i];
                    var newelem = new XElement(testStepName);
                    Serializer.Serialize(newelem, item, null, true);
                    elem.Add(newelem);
                }
                var vars = list.Variables;
                if (vars != null && vars.Count > 0)
                {
                    for (int i = 0; i < vars.Count; i++)
                    {
                        var item = vars[i];
                        var newelem = new XElement(varName);
                        Serializer.Serialize(newelem, item, null, true);
                        elem.Add(newelem);
                    }
                }

                return true;
            }
            return false;
        }
    }

}