// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.AspNetCore.Testing;
using Microsoft.Extensions.Primitives;

namespace Microsoft.AspNetCore.Http.Abstractions;

public class QueryStringTests
{
    [Fact]
    public void CtorThrows_IfQueryDoesNotHaveLeadingQuestionMark()
    {
        // Act and Assert
        ExceptionAssert.ThrowsArgument(() => new QueryString("hello"), "value", "The leading '?' must be included for a non-empty query.");
    }

    [Fact]
    public void CtorNullOrEmpty_Success()
    {
        var query = new QueryString();
        Assert.False(query.HasValue);
        Assert.Null(query.Value);

        query = new QueryString(null);
        Assert.False(query.HasValue);
        Assert.Null(query.Value);

        query = new QueryString(string.Empty);
        Assert.False(query.HasValue);
        Assert.Equal(string.Empty, query.Value);
    }

    [Fact]
    public void CtorJustAQuestionMark_Success()
    {
        var query = new QueryString("?");
        Assert.True(query.HasValue);
        Assert.Equal("?", query.Value);
    }

    [Fact]
    public void ToString_EncodesHash()
    {
        var query = new QueryString("?Hello=Wor#ld");
        Assert.Equal("?Hello=Wor%23ld", query.ToString());
    }

    [Theory]
    [InlineData("name", "value", "?name=value")]
    [InlineData("na me", "val ue", "?na%20me=val%20ue")]
    [InlineData("name", "", "?name=")]
    [InlineData("name", null, "?name=")]
    [InlineData("", "value", "?=value")]
    [InlineData("", "", "?=")]
    [InlineData("", null, "?=")]
    public void CreateNameValue_Success(string name, string value, string expected)
    {
        var query = QueryString.Create(name, value);
        Assert.Equal(expected, query.Value);
    }

    [Fact]
    public void CreateFromList_Success()
    {
        var query = QueryString.Create(new[]
        {
                new KeyValuePair<string, string?>("key1", "value1"),
                new KeyValuePair<string, string?>("key2", "value2"),
                new KeyValuePair<string, string?>("key3", "value3"),
                new KeyValuePair<string, string?>("key4", null),
                new KeyValuePair<string, string?>("key5", "")
            });
        Assert.Equal("?key1=value1&key2=value2&key3=value3&key4=&key5=", query.Value);
    }

    [Fact]
    public void CreateFromListStringValues_Success()
    {
        var query = QueryString.Create(new[]
        {
                new KeyValuePair<string, StringValues>("key1", new StringValues("value1")),
                new KeyValuePair<string, StringValues>("key2", new StringValues("value2")),
                new KeyValuePair<string, StringValues>("key3", new StringValues("value3")),
                new KeyValuePair<string, StringValues>("key4", new StringValues()),
                new KeyValuePair<string, StringValues>("key5", new StringValues("")),
            });
        Assert.Equal("?key1=value1&key2=value2&key3=value3&key4=&key5=", query.Value);
    }

    [Theory]
    [InlineData(null, null, null)]
    [InlineData("", "", "")]
    [InlineData(null, "?name2=value2", "?name2=value2")]
    [InlineData("", "?name2=value2", "?name2=value2")]
    [InlineData("?", "?name2=value2", "?name2=value2")]
    [InlineData("?name1=value1", null, "?name1=value1")]
    [InlineData("?name1=value1", "", "?name1=value1")]
    [InlineData("?name1=value1", "?", "?name1=value1")]
    [InlineData("?name1=value1", "?name2=value2", "?name1=value1&name2=value2")]
    public void AddQueryString_Success(string query1, string query2, string expected)
    {
        var q1 = new QueryString(query1);
        var q2 = new QueryString(query2);
        Assert.Equal(expected, q1.Add(q2).Value);
        Assert.Equal(expected, (q1 + q2).Value);
    }

    [Theory]
    [InlineData("", "", "", "?=")]
    [InlineData("", "", null, "?=")]
    [InlineData("?", "", "", "?=")]
    [InlineData("?", "", null, "?=")]
    [InlineData("?", "name2", "value2", "?name2=value2")]
    [InlineData("?", "name2", "", "?name2=")]
    [InlineData("?", "name2", null, "?name2=")]
    [InlineData("?name1=value1", "name2", "value2", "?name1=value1&name2=value2")]
    [InlineData("?name1=value1", "na me2", "val ue2", "?name1=value1&na%20me2=val%20ue2")]
    [InlineData("?name1=value1", "", "", "?name1=value1&=")]
    [InlineData("?name1=value1", "", null, "?name1=value1&=")]
    [InlineData("?name1=value1", "name2", "", "?name1=value1&name2=")]
    [InlineData("?name1=value1", "name2", null, "?name1=value1&name2=")]
    public void AddNameValue_Success(string query1, string name2, string value2, string expected)
    {
        var q1 = new QueryString(query1);
        var q2 = q1.Add(name2, value2);
        Assert.Equal(expected, q2.Value);
    }

    [Fact]
    public void Equals_EmptyQueryStringAndDefaultQueryString()
    {
        // Act and Assert
        Assert.Equal(default(QueryString), QueryString.Empty);
        Assert.Equal(default(QueryString), QueryString.Empty);
        // explicitly checking == operator
        Assert.True(QueryString.Empty == default(QueryString));
        Assert.True(default(QueryString) == QueryString.Empty);
    }

    [Fact]
    public void NotEquals_DefaultQueryStringAndNonNullQueryString()
    {
        // Arrange
        var queryString = new QueryString("?foo=1");

        // Act and Assert
        Assert.NotEqual(default(QueryString), queryString);
    }

    [Fact]
    public void NotEquals_EmptyQueryStringAndNonNullQueryString()
    {
        // Arrange
        var queryString = new QueryString("?foo=1");

        // Act and Assert
        Assert.NotEqual(queryString, QueryString.Empty);
    }
}
