//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="ExpBinaryOperatorNode"
// Project: StgSharp
// AuthorGroup: Nitload Space
// Copyright (c) Nitload Space. All rights reserved.
//     
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//     
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using Microsoft.CodeAnalysis.CSharp;

using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace StgSharp.Script.Express
{
    public class ExpBinaryOperatorNode : ExpSyntaxNode
    {

        private ExpInstantiableElement _returnType;

        private ExpSyntaxNode _left;
        private ExpSyntaxNode _right;

        private ExpBinaryOperatorNode(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
            : base(source)
        {
            _left = left;
            _right = right;
        }

        public override ExpInstantiableElement EqualityTypeConvert => _returnType;

        public override ExpSyntaxNode Left => _left;

        public override ExpSyntaxNode Right => _right;

        public string Operator { get; private set; }

        public static ExpBinaryOperatorNode Add(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (!left.IsNumber && !right.IsNumber) {
                throw new ExpInvalidTypeException(source, "Number",
                                                   left.EqualityTypeConvert.Name);
            }
            bool isFloat =
                    (left._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0 ||
                    (right._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0;
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = isFloat ? ExpressCompile.ExpReal : ExpressCompile.ExpInt,
                _nodeFlag = ExpNodeFlag.Operator_Binary | ExpNodeFlag.BuiltinType_Number,
                CodeConvertTemplate = "{0} + {1}",
            };
        }

        public static ExpBinaryOperatorNode Assign(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (left.EqualityTypeConvert != right.EqualityTypeConvert) {
                throw new ExpInvalidTypeException(
                    source, left.EqualityTypeConvert.Name, right.EqualityTypeConvert.Name);
            }
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpInstantiableElement.Void,
                _nodeFlag = ExpNodeFlag.Operator_Binary | left._nodeFlag,
                Operator = "=",
                CodeConvertTemplate = "{0} = {1}",
            };
        }

        public static ExpBinaryOperatorNode CompareInstanceEqual(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpressCompile.ExpBool,
                _nodeFlag = ExpNodeFlag.BuiltinType_Boolean | ExpNodeFlag.Operator_Binary,
                CodeConvertTemplate = "!ReferenceEquals({0}, {1})",
            };
        }

        public static ExpBinaryOperatorNode CompareInstanceNotEqual(
                                            Token source,
                                            ExpSyntaxNode left,
                                            ExpSyntaxNode right)
        {
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpressCompile.ExpBool,
                _nodeFlag = ExpNodeFlag.BuiltinType_Boolean | ExpNodeFlag.Operator_Binary,
                CodeConvertTemplate = "ReferenceEquals({0}, {1})",
            };
        }

        public static ExpBinaryOperatorNode ConvertElement(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (right is not ExpMetaRefNode metaRef) {
                throw new ExpInvalidTypeException(
                    source, "<source of element>", right.EqualityTypeConvert.Name);
            }
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = metaRef.SourceRef,
                _nodeFlag = ExpNodeFlag.Operator_Binary,
                /*
                 * 0. instance to convert
                 * 1. target type
                 */
                CodeConvertTemplate = @"({0} as {1})"
            };
        }

        public static ExpBinaryOperatorNode Div(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (!left.IsNumber && !right.IsNumber) {
                throw new ExpInvalidTypeException(source, "Number",
                                                   left.EqualityTypeConvert.Name);
            }
            bool isFloat =
                    (left._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0 ||
                    (right._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0;
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = isFloat ? ExpressCompile.ExpReal : ExpressCompile.ExpInt,
                _nodeFlag = ExpNodeFlag.Operator_Binary | ExpNodeFlag.BuiltinType_Number,
                CodeConvertTemplate = "{0} / {1}",
            };
        }

        public static ExpBinaryOperatorNode EqualTo(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (left.EqualityTypeConvert != right.EqualityTypeConvert) {
                throw new ExpInvalidTypeException(
                    source, left.EqualityTypeConvert.Name, right.EqualityTypeConvert.Name);
            }
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpressCompile.ExpBool,
                _nodeFlag = ExpNodeFlag.BuiltinType_Boolean | ExpNodeFlag.Operator_Binary,
                CodeConvertTemplate = "{0} == {1}",
            };
        }

        public static ExpBinaryOperatorNode GreaterThan(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (!left.IsNumber && !right.IsNumber) {
                throw new ExpInvalidTypeException(source, "Number",
                                                   left.EqualityTypeConvert.Name);
            }
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpressCompile.ExpBool,
                _nodeFlag = ExpNodeFlag.BuiltinType_Boolean | ExpNodeFlag.Operator_Binary,
                CodeConvertTemplate = "{0} > {1}",
            };
        }

        public static ExpBinaryOperatorNode LessThan(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (!left.IsNumber && !right.IsNumber) {
                throw new ExpInvalidTypeException(source, "Number",
                                                   left.EqualityTypeConvert.Name);
            }
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpressCompile.ExpBool,
                _nodeFlag = ExpNodeFlag.BuiltinType_Boolean | ExpNodeFlag.Operator_Binary,
                CodeConvertTemplate = "{0} < {1}",
            };
        }

        public static ExpBinaryOperatorNode Mul(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (!left.IsNumber && !right.IsNumber) {
                throw new ExpInvalidTypeException(source, "Number",
                                                   left.EqualityTypeConvert.Name);
            }
            bool isFloat =
                    (left._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0 ||
                    (right._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0;
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = isFloat ? ExpressCompile.ExpReal : ExpressCompile.ExpInt,
                _nodeFlag = ExpNodeFlag.Operator_Binary | ExpNodeFlag.BuiltinType_Number,
                CodeConvertTemplate = "{0} * {1}",
            };
        }

        public static ExpBinaryOperatorNode NotEqualTo(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (left.EqualityTypeConvert != right.EqualityTypeConvert) {
                throw new ExpInvalidTypeException(
                    source, left.EqualityTypeConvert.Name, right.EqualityTypeConvert.Name);
            }
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpressCompile.ExpBool,
                _nodeFlag = ExpNodeFlag.BuiltinType_Boolean | ExpNodeFlag.Operator_Binary,
                CodeConvertTemplate = "{0} != {1}",
            };
        }

        public static ExpBinaryOperatorNode SmallerThan(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (!left.IsNumber && !right.IsNumber) {
                throw new ExpInvalidTypeException(source, "Number",
                                                   left.EqualityTypeConvert.Name);
            }
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = ExpressCompile.ExpBool,
                _nodeFlag = ExpNodeFlag.BuiltinType_Boolean | ExpNodeFlag.Operator_Binary,
                CodeConvertTemplate = "{0} < {1}",
            };
        }

        public static ExpBinaryOperatorNode Sub(Token source, ExpSyntaxNode left, ExpSyntaxNode right)
        {
            if (!left.IsNumber && !right.IsNumber) {
                throw new ExpInvalidTypeException(source, "Number",
                                                   left.EqualityTypeConvert.Name);
            }
            bool isFloat =
                    (left._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0 ||
                    (right._nodeFlag | ExpNodeFlag.BuiltinType_Real) == 0;
            return new ExpBinaryOperatorNode(source, left, right)
            {
                _returnType = isFloat ? ExpressCompile.ExpReal : ExpressCompile.ExpInt,
                _nodeFlag = ExpNodeFlag.Operator_Binary | ExpNodeFlag.BuiltinType_Number,
                CodeConvertTemplate = "{0} - {1}",
            };
        }

    }
}