// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.TestCommon;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Xunit;

namespace Microsoft.AspNetCore.Mvc.Core
{
    public class HtmlHelperDropDownListExtensionsTest
    {
        private static readonly List<SelectListItem> BasicSelectList = new List<SelectListItem>
        {
            new SelectListItem { Text = "Zero",  Value = "0"},
            new SelectListItem { Text = "One",   Value = "1"},
            new SelectListItem { Text = "Two",   Value = "2"},
            new SelectListItem { Text = "Three", Value = "3"},
        };

        [Fact]
        public void DropDownList_FindsSelectList()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property1]]\" name=\"HtmlEncode[[Property1]]\">" +
                "<option value=\"HtmlEncode[[0]]\">HtmlEncode[[Zero]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[1]]\">HtmlEncode[[One]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[2]]\">HtmlEncode[[Two]]</option>" + Environment.NewLine +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[3]]\">HtmlEncode[[Three]]</option>" + Environment.NewLine +
                "</select>";
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData.ModelState.SetModelValue("Property1", 3, "3");
            helper.ViewData["Property1"] = BasicSelectList;

            // Act
            var dropDownListResult = helper.DropDownList("Property1");

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListResult));
        }

        [Fact]
        public void DropDownList_FindsSelectList_UsesOptionLabel()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property1]]\" name=\"HtmlEncode[[Property1]]\">" +
                "<option value=\"\">HtmlEncode[[--select--]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[0]]\">HtmlEncode[[Zero]]</option>" + Environment.NewLine +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[1]]\">HtmlEncode[[One]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[2]]\">HtmlEncode[[Two]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[3]]\">HtmlEncode[[Three]]</option>" + Environment.NewLine +
                "</select>";
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData.ModelState.SetModelValue("Property1", 1, "1");
            helper.ViewData["Property1"] = BasicSelectList;

            // Act
            var dropDownListResult = helper.DropDownList("Property1", "--select--");

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListResult));
        }

        [Fact]
        public void DropDownList_UsesSpecifiedExpressionAndSelectList()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property2]]\" name=\"HtmlEncode[[Property2]]\">" +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[4]]\">HtmlEncode[[Four]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[5]]\">HtmlEncode[[Five]]</option>" + Environment.NewLine +
                "</select>";
            var selectList = new List<SelectListItem>
            {
                new SelectListItem { Text = "Four", Value = "4" },
                new SelectListItem { Text = "Five", Value = "5" },
            };
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData.Model = new TestModel { Property2 = "4" };

            // Act
            var dropDownListResult = helper.DropDownList("Property2", selectList);

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListResult));
        }

        [Fact]
        public void DropDownList_UsesSpecifiedExpressionAndSelectListAndHtmlAttributes()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property1]]\" Key=\"HtmlEncode[[Value]]\" name=\"HtmlEncode[[Property1]]\">" +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[4]]\">HtmlEncode[[Four]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[5]]\">HtmlEncode[[Five]]</option>" + Environment.NewLine +
                "</select>";
            var selectList = new List<SelectListItem>
            {
                new SelectListItem { Text = "Four", Value = "4" },
                new SelectListItem { Text = "Five", Value = "5" },
            };
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData.ModelState.SetModelValue("Property1", 4, "4");
            helper.ViewData["Property1"] = BasicSelectList;

            // Act
            var dropDownListResult = helper.DropDownList("Property1", selectList, new { Key = "Value", name = "CustomName" });

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListResult));
        }

        [Fact]
        public void DropDownList_UsesExpressionAndSpecifiedSelectListAndOptionLabel()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property2]]\" name=\"HtmlEncode[[Property2]]\">" +
                "<option value=\"\">HtmlEncode[[--select--]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[4]]\">HtmlEncode[[Four]]</option>" + Environment.NewLine +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[5]]\">HtmlEncode[[Five]]</option>" + Environment.NewLine +
                "</select>";
            var selectList = new List<SelectListItem>
            {
                new SelectListItem { Text = "Four", Value = "4" },
                new SelectListItem { Text = "Five", Value = "5" },
            };
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData.Model = new TestModel { Property2 = "5" };

            // Act
            var dropDownListResult = helper.DropDownList("Property2", selectList, "--select--");

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListResult));
        }

        [Fact]
        public void DropDownListFor_NullSelectListFindsListFromViewData()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property1]]\" name=\"HtmlEncode[[Property1]]\">" +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[0]]\">HtmlEncode[[Zero]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[1]]\">HtmlEncode[[One]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[2]]\">HtmlEncode[[Two]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[3]]\">HtmlEncode[[Three]]</option>" + Environment.NewLine +
                "</select>";
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData["Property1"] = BasicSelectList;
            helper.ViewData.Model = new TestModel { Property1 = 0 };

            // Act
            var dropDownListForResult = helper.DropDownListFor(m => m.Property1, selectList: null);

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListForResult));
        }

        [Fact]
        public void DropDownListFor_UsesSpecifiedExpressionAndSelectList()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property2]]\" name=\"HtmlEncode[[Property2]]\">" +
                "<option value=\"HtmlEncode[[4]]\">HtmlEncode[[Four]]</option>" + Environment.NewLine +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[5]]\">HtmlEncode[[Five]]</option>" + Environment.NewLine +
                "</select>";
            var selectList = new List<SelectListItem>
            {
                new SelectListItem { Text = "Four", Value = "4" },
                new SelectListItem { Text = "Five", Value = "5" },
            };
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData["Property1"] = BasicSelectList;
            helper.ViewData.Model = new TestModel { Property2 = "5" };

            // Act
            var dropDownListForResult = helper.DropDownListFor(m => m.Property2, selectList);

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListForResult));
        }

        [Fact]
        public void DropDownListFor_UsesSpecifiedExpressionAndSelectListAndHtmlAttributes()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property3_2_]]\" Key=\"HtmlEncode[[Value]]\" name=\"HtmlEncode[[Property3[2]]]\">" +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[4]]\">HtmlEncode[[Four]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[5]]\">HtmlEncode[[Five]]</option>" + Environment.NewLine +
                "</select>";
            var selectList = new List<SelectListItem>
            {
                new SelectListItem { Text = "Four", Value = "4" },
                new SelectListItem { Text = "Five", Value = "5" },
            };
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData.Model = new TestModel { Property3 = new List<string> { "0", "2", "4" } };

            // Act
            var dropDownListForResult = helper.DropDownListFor(m => m.Property3[2], selectList, new { Key = "Value", name = "CustomName" });

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListForResult));
        }

        [Fact]
        public void DropDownListFor_UsesSpecifiedSelectListAndOptionLabel()
        {
            // Arrange
            var expectedHtml = "<select id=\"HtmlEncode[[Property2]]\" name=\"HtmlEncode[[Property2]]\">" +
                "<option value=\"\">HtmlEncode[[--select--]]</option>" + Environment.NewLine +
                "<option value=\"HtmlEncode[[4]]\">HtmlEncode[[Four]]</option>" + Environment.NewLine +
                "<option selected=\"HtmlEncode[[selected]]\" value=\"HtmlEncode[[5]]\">HtmlEncode[[Five]]</option>" + Environment.NewLine +
                "</select>";
            var selectList = new List<SelectListItem>
            {
                new SelectListItem { Text = "Four", Value = "4" },
                new SelectListItem { Text = "Five", Value = "5" },
            };
            var metadataProvider = new EmptyModelMetadataProvider();
            var helper = DefaultTemplatesUtilities.GetHtmlHelper(new ViewDataDictionary<TestModel>(metadataProvider));
            helper.ViewContext.ClientValidationEnabled = false;
            helper.ViewData.Model = new TestModel { Property2 = "5" };

            // Act
            var dropDownListForResult = helper.DropDownListFor(m => m.Property2, selectList, "--select--");

            // Assert
            Assert.Equal(expectedHtml, HtmlContentUtilities.HtmlContentToString(dropDownListForResult));
        }

        private class TestModel
        {
            public int Property1 { get; set; }

            public string Property2 { get; set; }

            public List<string> Property3 { get; set; }
        }
    }
}
