//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="ExpSyntaxAnalyzer.RangeAndIndex"
// 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.Operations;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using ExpKeyword = StgSharp.Script.Express.ExpressCompile.Keyword;

namespace StgSharp.Script.Express
{
    public partial class ExpSyntaxAnalyzer
    {

        private void AppendToken_RangeAndIndex(Token t)
        {
            ExpSyntaxNode root;
            switch (t.Value)
            {
                case "[":
                    RangeAndIndexState state = new RangeAndIndexState();
                    state.CurrentState = t.Value;
                    _cache.CurrentDepthMark.StateCache = state;
                    break;
                case "]":
                    state = _cache.StateOfCurrentDepth<RangeAndIndexState>();

                    // Generate range or index object
                    if (_cache.StatementsInDepth.Count != 0)
                    {
                        throw new ExpInvalidSyntaxException(
                            "Range and index syntax error: expected one statement to define range beginning.");
                    }
                    ReverseAnalyzeStatement();
                    root = _cache.StatementsInDepth.Pop();
                    if (ExpNodeFlag.BuiltinType_Int.IsNotInFlag(root.NodeFlag)) {
                        throw new ExpInvalidTypeException(
                            root, "integer", root.EqualityTypeConvert?.Name ?? string.Empty);
                    }
                    if (state.CurrentState == "[") { } else { }
                    break;
                case ":":
                    state = _cache.StateOfCurrentDepth<RangeAndIndexState>();
                    if (state.CurrentState != "[") {
                        throw new ExpInvalidSyntaxException(
                            "Range and index syntax error: wrong position of :");
                    }
                    if (_cache.StatementsInDepth.Count != 0) {
                        throw new ExpInvalidSyntaxException(
                            "Range and index syntax error: expected one statement to define range beginning.");
                    }
                    ReverseAnalyzeStatement();
                    root = _cache.StatementsInDepth.Pop();
                    if (ExpNodeFlag.BuiltinType_Int.IsNotInFlag(root.NodeFlag)) {
                        throw new ExpInvalidTypeException(
                            root, "integer", root.EqualityTypeConvert?.Name ?? string.Empty);
                    }
                    state.RangeStart = root;
                    break;
                default:
                    state = _cache.StateOfCurrentDepth<RangeAndIndexState>();
                    if (t.Value == "?")
                    {
                        switch (state.CurrentState)
                        {
                            case ":":
                                _cache.PushOperand(new ExpIntNode(t, int.MaxValue, true));
                                break;
                            case "[":
                                _cache.PushOperand(new ExpIntNode(t, int.MaxValue, true));
                                break;
                            default:
                                throw new ExpInvalidSyntaxException(
                                    "Range and index syntax error: \"?\" can only be used in range or index");
                        }
                    }
                    AppendToken_Common(t);
                    break;
            }
        }

        private class RangeAndIndexState : ICompileDepthState
        {

            public ExpSyntaxNode RangeStart { get; set; }

            public string CurrentState { get; set; } = string.Empty;

        }

    }
}