using System;
using System.Text;
using Util.Data.Sql.Builders.Conditions;
using Util.Data.Sql.Builders.Params;
using Util.Data.Sql.Tests.Samples;
using Xunit;

namespace Util.Data.Sql.Tests.Builders.Conditions; 

/// <summary>
/// Sql小于查询条件测试
/// </summary>
public class LessConditionTest {
    /// <summary>
    /// 参数管理器
    /// </summary>
    private readonly IParameterManager _parameterManager;

    /// <summary>
    /// 测试初始化
    /// </summary>
    public LessConditionTest() {
        _parameterManager = new ParameterManager( TestDialect.Instance );
    }

    /// <summary>
    /// 获取结果
    /// </summary>
    private string GetResult( ISqlCondition condition ) {
        var result = new StringBuilder();
        condition.AppendTo( result );
        return result.ToString();
    }

    /// <summary>
    /// 测试创建条件 - 验证列名为空
    /// </summary>
    [Fact]
    public void TestCreate_Validate() {
        Assert.Throws<ArgumentNullException>( () => {
            var condition = new LessCondition( _parameterManager, "", 1, true );
        } );
    }

    /// <summary>
    /// 测试获取条件 - 参数化
    /// </summary>
    [Fact]
    public void TestGetCondition_1() {
        var condition = new LessCondition( _parameterManager, "a", 1, true );
        Assert.Equal( "a<@_p_0", GetResult( condition ) );
        Assert.Equal( 1, _parameterManager.GetValue( "@_p_0" ) );
    }

    /// <summary>
    /// 测试获取条件 - 非参数化
    /// </summary>
    [Fact]
    public void TestGetCondition_2() {
        var condition = new LessCondition( _parameterManager, "a", "b", false );
        Assert.Equal( "a<b", GetResult( condition ) );
        Assert.Equal( 0, _parameterManager.GetParams().Count );
    }

    /// <summary>
    /// 测试获取条件 - 值为ISqlBuilder
    /// </summary>
    [Fact]
    public void TestGetCondition_3() {
        var result = new StringBuilder();
        result.Append( "a<" );
        result.AppendLine( "(Select [a] " );
        result.Append( "From [b])" );

        var builder = new TestSqlBuilder().Select( "a" ).From( "b" );
        var condition = new LessCondition( _parameterManager, "a", builder, true );
        Assert.Equal( result.ToString(), GetResult( condition ) );
    }
}