using System.Data;
using System.Reflection;
using Dapper;
using JdeScoping.DataAccess.Extensions;
using JdeScoping.DataAccess.Models;
using JdeScoping.DataAccess.Models.FilterEntries;
using Shouldly;
using Xunit;

namespace JdeScoping.DataAccess.Tests.Extensions;

/// <summary>
/// Unit tests for TableValuedParameterExtensions.
/// </summary>
public sealed class TableValuedParameterExtensionsTests
{
    #region CreateWorkOrderFilterParameter Tests

    [Fact]
    public void CreateWorkOrderFilterParameter_ProducesCorrectSchema()
    {
        // Arrange
        var model = new SearchModel
        {
            WorkOrderFilter =
            [
                new WorkOrderFilterEntry { WorkOrderNumber = 12345, ItemNumber = "ABC" }
            ]
        };

        // Act
        var param = model.CreateWorkOrderFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.ShouldNotBeNull();
        dataTable.Columns.Count.ShouldBe(1);
        dataTable.Columns.Contains("WorkOrderNumber").ShouldBeTrue();
        dataTable.Columns["WorkOrderNumber"]!.DataType.ShouldBe(typeof(long));
    }

    [Fact]
    public void CreateWorkOrderFilterParameter_WithEmptyCollection_ProducesEmptyDataTable()
    {
        // Arrange
        var model = new SearchModel
        {
            WorkOrderFilter = []
        };

        // Act
        var param = model.CreateWorkOrderFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.ShouldNotBeNull();
        dataTable.Rows.Count.ShouldBe(0);
    }

    [Fact]
    public void CreateWorkOrderFilterParameter_PopulatesCorrectData()
    {
        // Arrange
        var model = new SearchModel
        {
            WorkOrderFilter =
            [
                new WorkOrderFilterEntry { WorkOrderNumber = 12345 },
                new WorkOrderFilterEntry { WorkOrderNumber = 67890 }
            ]
        };

        // Act
        var param = model.CreateWorkOrderFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(2);
        dataTable.Rows[0]["WorkOrderNumber"].ShouldBe(12345L);
        dataTable.Rows[1]["WorkOrderNumber"].ShouldBe(67890L);
    }

    #endregion

    #region CreateItemNumberFilterParameter Tests

    [Fact]
    public void CreateItemNumberFilterParameter_ProducesCorrectSchema()
    {
        // Arrange
        var model = new SearchModel
        {
            ItemNumberFilter =
            [
                new ItemNumberFilterEntry { ItemNumber = "ABC123" }
            ]
        };

        // Act
        var param = model.CreateItemNumberFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.ShouldNotBeNull();
        dataTable.Columns.Count.ShouldBe(1);
        dataTable.Columns.Contains("ItemNumber").ShouldBeTrue();
        dataTable.Columns["ItemNumber"]!.DataType.ShouldBe(typeof(string));
    }

    [Fact]
    public void CreateItemNumberFilterParameter_WithEmptyCollection_ProducesEmptyDataTable()
    {
        // Arrange
        var model = new SearchModel
        {
            ItemNumberFilter = []
        };

        // Act
        var param = model.CreateItemNumberFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(0);
    }

    #endregion

    #region CreateProfitCenterFilterParameter Tests

    [Fact]
    public void CreateProfitCenterFilterParameter_ProducesCorrectSchema()
    {
        // Arrange
        var model = new SearchModel
        {
            ProfitCenterFilter =
            [
                new ProfitCenterFilterEntry { Code = "PC001" }
            ]
        };

        // Act
        var param = model.CreateProfitCenterFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Columns.Count.ShouldBe(1);
        dataTable.Columns.Contains("Code").ShouldBeTrue();
        dataTable.Columns["Code"]!.DataType.ShouldBe(typeof(string));
    }

    [Fact]
    public void CreateProfitCenterFilterParameter_WithEmptyCollection_ProducesEmptyDataTable()
    {
        // Arrange
        var model = new SearchModel
        {
            ProfitCenterFilter = []
        };

        // Act
        var param = model.CreateProfitCenterFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(0);
    }

    #endregion

    #region CreateWorkCenterFilterParameter Tests

    [Fact]
    public void CreateWorkCenterFilterParameter_ProducesCorrectSchema()
    {
        // Arrange
        var model = new SearchModel
        {
            WorkCenterFilter =
            [
                new WorkCenterFilterEntry { Code = "WC001" }
            ]
        };

        // Act
        var param = model.CreateWorkCenterFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Columns.Count.ShouldBe(1);
        dataTable.Columns.Contains("Code").ShouldBeTrue();
        dataTable.Columns["Code"]!.DataType.ShouldBe(typeof(string));
    }

    [Fact]
    public void CreateWorkCenterFilterParameter_WithEmptyCollection_ProducesEmptyDataTable()
    {
        // Arrange
        var model = new SearchModel
        {
            WorkCenterFilter = []
        };

        // Act
        var param = model.CreateWorkCenterFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(0);
    }

    #endregion

    #region CreateComponentLotFilterParameter Tests

    [Fact]
    public void CreateComponentLotFilterParameter_ProducesCorrectSchema()
    {
        // Arrange
        var model = new SearchModel
        {
            ComponentLotFilter =
            [
                new ComponentLotFilterEntry { LotNumber = "LOT001", ItemNumber = "ITEM001" }
            ]
        };

        // Act
        var param = model.CreateComponentLotFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Columns.Count.ShouldBe(2);
        dataTable.Columns.Contains("ComponentLotNumber").ShouldBeTrue();
        dataTable.Columns.Contains("ItemNumber").ShouldBeTrue();
        dataTable.Columns["ComponentLotNumber"]!.DataType.ShouldBe(typeof(string));
        dataTable.Columns["ItemNumber"]!.DataType.ShouldBe(typeof(string));
    }

    [Fact]
    public void CreateComponentLotFilterParameter_WithEmptyCollection_ProducesEmptyDataTable()
    {
        // Arrange
        var model = new SearchModel
        {
            ComponentLotFilter = []
        };

        // Act
        var param = model.CreateComponentLotFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(0);
    }

    [Fact]
    public void CreateComponentLotFilterParameter_PopulatesCorrectData()
    {
        // Arrange
        var model = new SearchModel
        {
            ComponentLotFilter =
            [
                new ComponentLotFilterEntry { LotNumber = "LOT001", ItemNumber = "ITEM001" },
                new ComponentLotFilterEntry { LotNumber = "LOT002", ItemNumber = "ITEM002" }
            ]
        };

        // Act
        var param = model.CreateComponentLotFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(2);
        dataTable.Rows[0]["ComponentLotNumber"].ShouldBe("LOT001");
        dataTable.Rows[0]["ItemNumber"].ShouldBe("ITEM001");
    }

    #endregion

    #region CreateOperatorFilterParameter Tests

    [Fact]
    public void CreateOperatorFilterParameter_ProducesCorrectSchema()
    {
        // Arrange
        var model = new SearchModel
        {
            OperatorFilter =
            [
                new OperatorFilterEntry { UserId = "USER01", AddressNumber = 123 }
            ]
        };

        // Act
        var param = model.CreateOperatorFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Columns.Count.ShouldBe(1);
        dataTable.Columns.Contains("UserName").ShouldBeTrue();
        dataTable.Columns["UserName"]!.DataType.ShouldBe(typeof(string));
    }

    [Fact]
    public void CreateOperatorFilterParameter_WithEmptyCollection_ProducesEmptyDataTable()
    {
        // Arrange
        var model = new SearchModel
        {
            OperatorFilter = []
        };

        // Act
        var param = model.CreateOperatorFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(0);
    }

    #endregion

    #region CreateItemOperationMisFilterParameter Tests

    [Fact]
    public void CreateItemOperationMisFilterParameter_ProducesCorrectSchema()
    {
        // Arrange
        var model = new SearchModel
        {
            ItemOperationMisFilter =
            [
                new ItemOperationMisFilterEntry
                {
                    ItemNumber = "ITEM001",
                    OperationNumber = "010",
                    MisNumber = "MIS001",
                    MisRevision = "A"
                }
            ]
        };

        // Act
        var param = model.CreateItemOperationMisFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Columns.Count.ShouldBe(4);
        dataTable.Columns.Contains("ItemNumber").ShouldBeTrue();
        dataTable.Columns.Contains("OperationNumber").ShouldBeTrue();
        dataTable.Columns.Contains("MisNumber").ShouldBeTrue();
        dataTable.Columns.Contains("MisRevision").ShouldBeTrue();

        dataTable.Columns["ItemNumber"]!.DataType.ShouldBe(typeof(string));
        dataTable.Columns["OperationNumber"]!.DataType.ShouldBe(typeof(string));
        dataTable.Columns["MisNumber"]!.DataType.ShouldBe(typeof(string));
        dataTable.Columns["MisRevision"]!.DataType.ShouldBe(typeof(string));
    }

    [Fact]
    public void CreateItemOperationMisFilterParameter_WithEmptyCollection_ProducesEmptyDataTable()
    {
        // Arrange
        var model = new SearchModel
        {
            ItemOperationMisFilter = []
        };

        // Act
        var param = model.CreateItemOperationMisFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(0);
    }

    [Fact]
    public void CreateItemOperationMisFilterParameter_PopulatesCorrectData()
    {
        // Arrange
        var model = new SearchModel
        {
            ItemOperationMisFilter =
            [
                new ItemOperationMisFilterEntry
                {
                    ItemNumber = "ITEM001",
                    OperationNumber = "010",
                    MisNumber = "MIS001",
                    MisRevision = "A"
                }
            ]
        };

        // Act
        var param = model.CreateItemOperationMisFilterParameter();
        var dataTable = ExtractDataTable(param);

        // Assert
        dataTable.Rows.Count.ShouldBe(1);
        dataTable.Rows[0]["ItemNumber"].ShouldBe("ITEM001");
        dataTable.Rows[0]["OperationNumber"].ShouldBe("010");
        dataTable.Rows[0]["MisNumber"].ShouldBe("MIS001");
        dataTable.Rows[0]["MisRevision"].ShouldBe("A");
    }

    #endregion

    #region Helper Methods

    /// <summary>
    /// Extracts the underlying DataTable from a Dapper table-valued parameter.
    /// Uses reflection to access internal fields across different Dapper versions.
    /// </summary>
    private static DataTable ExtractDataTable(SqlMapper.ICustomQueryParameter param)
    {
        // The TableValuedParameter wraps a DataTable - try multiple field/property names
        // across different Dapper versions
        var type = param.GetType();
        var bindingFlags = BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance;

        // Try field names used in different Dapper versions
        var fieldNames = new[] { "_table", "table", "Table", "_dataTable", "dataTable" };
        foreach (var fieldName in fieldNames)
        {
            var field = type.GetField(fieldName, bindingFlags);
            if (field != null && field.FieldType == typeof(DataTable))
            {
                var value = field.GetValue(param);
                if (value is DataTable dt)
                    return dt;
            }
        }

        // Try property names
        var propertyNames = new[] { "Table", "DataTable", "table", "_table" };
        foreach (var propName in propertyNames)
        {
            var prop = type.GetProperty(propName, bindingFlags);
            if (prop != null && prop.PropertyType == typeof(DataTable))
            {
                var value = prop.GetValue(param);
                if (value is DataTable dt)
                    return dt;
            }
        }

        // Last resort: scan all fields
        foreach (var field in type.GetFields(bindingFlags))
        {
            if (field.FieldType == typeof(DataTable))
            {
                var value = field.GetValue(param);
                if (value is DataTable dt)
                    return dt;
            }
        }

        // Scan all properties
        foreach (var prop in type.GetProperties(bindingFlags))
        {
            if (prop.PropertyType == typeof(DataTable))
            {
                var value = prop.GetValue(param);
                if (value is DataTable dt)
                    return dt;
            }
        }

        throw new InvalidOperationException(
            $"Could not extract DataTable from {type.FullName}. " +
            $"Fields: {string.Join(", ", type.GetFields(bindingFlags).Select(f => f.Name))}. " +
            $"Properties: {string.Join(", ", type.GetProperties(bindingFlags).Select(p => p.Name))}");
    }

    #endregion
}