using System.Linq;
using System.Threading.Tasks;
using Util.Data.Metadata;
using Xunit;

namespace Util.Data.Dapper.Tests.Metadata; 

/// <summary>
/// Sql Server数据库元数据服务测试
/// </summary>
public class SqlServerMetadataServiceTest {
    /// <summary>
    /// 数据库元信息服务
    /// </summary>
    private readonly IMetadataService _metadataService;

    /// <summary>
    /// 初始化
    /// </summary>
    public SqlServerMetadataServiceTest( IMetadataService service ) {
        _metadataService = service;
    }

    /// <summary>
    /// 测试获取数据库名称
    /// </summary>
    [Fact]
    public async Task TestDatabaseName() {
        var info = await _metadataService.GetDatabaseInfoAsync();
        Assert.Equal( "Util.Data.Dapper.Test", info.Name );
    }

    /// <summary>
    /// 测试获取表信息
    /// </summary>
    [Fact]
    public async Task TestTableInfo() {
        var info = await _metadataService.GetDatabaseInfoAsync();
        var table = info.Tables.FirstOrDefault( t => t.Name == "Product" );
        Assert.NotNull( table );
        Assert.Equal( "Products", table.Schema );
        Assert.Equal( "产品", table.Comment );
    }

    /// <summary>
    /// 测试获取主键信息
    /// </summary>
    [Fact]
    public async Task TestPrimaryKey() {
        var info = await _metadataService.GetDatabaseInfoAsync();
        var table = info.Tables.First( t => t.Name == "OrderItem" );
        var pkColumn = table.Columns.FirstOrDefault( t => t.Name == "OrderItemId" );
        Assert.NotNull( pkColumn );
        Assert.True( pkColumn.IsPrimaryKey );
        var fkColumn = table.Columns.FirstOrDefault( t => t.Name == "OrderId" );
        Assert.NotNull( fkColumn );
        Assert.False( fkColumn.IsPrimaryKey );
    }

    /// <summary>
    /// 测试获取自增信息
    /// </summary>
    [Fact]
    public async Task TestAutoIncrement() {
        var info = await _metadataService.GetDatabaseInfoAsync();
        var table = info.Tables.FirstOrDefault( t => t.Name == "Customer" );
        Assert.NotNull( table );
        var column = table.Columns.FirstOrDefault( t => t.Name == "CustomerId" );
        Assert.NotNull( column );
        Assert.True( column.IsAutoIncrement );
        Assert.Equal( "int", column.DataType );
    }

    /// <summary>
    /// 测试获取数值精度信息
    /// </summary>
    [Fact]
    public async Task TestPrecision() {
        var info = await _metadataService.GetDatabaseInfoAsync();
        var table = info.Tables.FirstOrDefault( t => t.Name == "Product" );
        Assert.NotNull( table );
        var column = table.Columns.FirstOrDefault( t => t.Name == "Price" );
        Assert.NotNull( column );
        Assert.Equal( 12, column.Precision );
        Assert.Equal( 2, column.Scale );
    }

    /// <summary>
    /// 测试获取字符串列信息
    /// </summary>
    [Fact]
    public async Task TestStringInfo() {
        var info = await _metadataService.GetDatabaseInfoAsync();
        var table = info.Tables.FirstOrDefault( t => t.Name == "Product" );
        Assert.NotNull( table );
        var count = table.Columns.Count( t => t.Name == "Code" );
        Assert.Equal( 1, count );
        var column = table.Columns.FirstOrDefault( t => t.Name == "Code" );
        Assert.NotNull( column );
        Assert.Equal( "产品编码", column.Comment );
        Assert.False( column.IsPrimaryKey );
        Assert.True( column.IsNullable );
        Assert.Equal( "nvarchar", column.DataType );
        Assert.Equal( 100, column.Length );
    }
}