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using Components;

using Components.Aphid.Interpreter;

using System;

using System.CodeDom;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

using System.Text;

using System.Threading.Tasks;

namespace AphidCodeGenerator

{

public class AphidObjectGenerator : IAphidCodeObject

{

private static readonly Type[] _types = new Type[]

{

typeof(byte),

typeof(sbyte),

typeof(Int16),

typeof(UInt16),

typeof(Int32),

typeof(UInt32),

typeof(Int64),

typeof(UInt64),

};

private static readonly Type[] _arrayTypes = new Type[]

{

typeof(decimal),

typeof(string),

typeof(bool),

};

public string CodeFile { get { return @"Interpreter\AphidObject.g.cs"; } }

static CodeMethodInvokeExpression CreateSetValue(CodeExpression src)

{

return CodeHelper

.Arg("property")

.GetMethod("SetValue")

.Invoke(new CodeExpression[]

{

CodeHelper.Arg("destObj"),

src,

CodeHelper.Null()

});

}

static CodeConditionStatement CreateSetValueCondition(Type type, CodeExpression src)

{

var prop = CodeHelper.Arg("property");

var propType = prop.GetProperty("PropertyType");

var setValue = CreateSetValue(src);

var condition = new CodeConditionStatement();

condition.Condition = new CodeBinaryOperatorExpression(

propType,

CodeBinaryOperatorType.ValueEquality,

CodeHelper.TypeOf(type));

condition.TrueStatements.Add(setValue);

condition.TrueStatements.Add(CodeHelper.Return(CodeHelper.True()));

return condition;

}

static CodeConditionStatement CreateNumberSetValueCondition(Type type)

{

return CreateSetValueCondition(

type,

CodeHelper

.TypeRefExp(typeof(Convert))

.GetMethod("To" + type.Name)

.Invoke(CodeHelper.Arg("srcObj").GetProperty("Value")));

}

static CodeConditionStatement CreateArraySetValueCondition(Type type)

{

string lambda = type == typeof(decimal) ? "x => x.GetNumber()" :

type == typeof(bool) ? "x => x.GetBool()" :

type == typeof(string) ? "x => x.GetString()" :

string.Format("x => ({0})x.GetNumber()", type.FullName);

var toArray = CodeHelper

.Arg("srcObj")

.InvokeMethod("GetList")

.InvokeMethod("Select",

new CodeSnippetExpression(lambda))

.InvokeMethod("ToArray");

return CreateSetValueCondition(type.MakeArrayType(), toArray);

}

static CodeMemberMethod TrySetProperty(CodeStatement firstCondition)

{

var method = new CodeMemberMethod();

method.ReturnType = CodeHelper.TypeRef(typeof(bool));

method.Name = "TrySetProperty";

method.AddParameter(typeof(PropertyInfo), "property");

method.AddParameter(typeof(object), "destObj");

method.AddParameter(typeof(AphidObject), "srcObj");

method.Statements.Add(firstCondition);

return method;

}

public CodeObject CreateCodeObject()

{

var conditions = _types

.Select(CreateNumberSetValueCondition)

.Concat(_types

.Concat(_arrayTypes)

.Select(CreateArraySetValueCondition));

var firstCondition = conditions.First();

var currentCondition = firstCondition;

foreach (var condition in conditions.Skip(1))

{

currentCondition.FalseStatements.Add(condition);

currentCondition = condition;

}

currentCondition.FalseStatements.Add(CodeHelper.Return(CodeHelper.False()));

var type = new CodeTypeDeclaration("AphidObject") { IsPartial = true };

type.Members.Add(TrySetProperty(firstCondition));

var ns = new CodeNamespace();

ns.Imports.Add(new CodeNamespaceImport("System.Linq"));

ns.Name = "Components.Aphid.Interpreter";

ns.Types.Add(type);

var unit = new CodeCompileUnit();

unit.Namespaces.Add(ns);

return unit;

}

}

}