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** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt VS Tools.
**
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using System.Globalization;
using System.Linq;
using System.Windows.Controls;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.Shell.Interop;
using EnvDTE;

namespace QtVsTools.Wizards.Util
{
    using Core;
    using VisualStudio;

    internal class FileExistsinFilterValidationRule : VCLanguageManagerValidationRule
    {
        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            if (value is string) {
                var dte = VsServiceProvider.GetService<SDTE, DTE>();
                if (dte == null)
                    return ValidationResult.ValidResult;

                var project = HelperFunctions.GetSelectedProject(dte);
                if (project == null)
                    return ValidationResult.ValidResult;

                var files = HelperFunctions.GetProjectFiles(project, Filter);
                if (files.Count == 0)
                    return ValidationResult.ValidResult;

                var fileName = (value as string).ToUpperInvariant();
                if (files.FirstOrDefault(x => x.ToUpperInvariant() == fileName) != null)
                    return new ValidationResult(false, @"File already exists.");
                return ValidationResult.ValidResult;
            }
            return new ValidationResult(false, @"Invalid file name.");
        }

        public FilesToList Filter { get; set; }
    }
}