inabox/InABox.Database/ColumnUpdate.cs

using InABox.Core;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace InABox.Database;

public interface IColumnUpdate
{
    IColumn Column { get; }

    IComplexFormulaNode Update { get; }
}

public interface IColumnUpdate<T> : IColumnUpdate
{
    new Column<T> Column { get; }

    IColumn IColumnUpdate.Column => Column;
}

public class ColumnUpdate<T, TValue> : IColumnUpdate<T>
{
    public Column<T> Column { get; }

    public IComplexFormulaNode<T, TValue> Update { get; }

    IComplexFormulaNode IColumnUpdate.Update => Update;

    public ColumnUpdate(Expression<Func<T, TValue>> column, IComplexFormulaNode<T, TValue> update)
    {
        Column = new(CoreUtils.GetFullPropertyName(column));
        Update = update;
    }
}

public interface IColumnUpdates
{
    IEnumerable<IColumnUpdate> Updates();
}

public class ColumnUpdates<T> : List<IColumnUpdate<T>>, IColumnUpdates
{
    public IEnumerable<IColumnUpdate> Updates() => this;

    public ColumnUpdates<T> Add<TValue>(Expression<Func<T, TValue>> column, IComplexFormulaNode<T, TValue> update)
    {
        Add(new ColumnUpdate<T, TValue>(column, update));
        return this;
    }

    public ColumnUpdates<T> Add<TValue>(Expression<Func<T, TValue>> column, Func<IComplexFormulaGenerator<T, TValue>, IComplexFormulaNode<T, TValue>> update)
    {
        Add(new ColumnUpdate<T, TValue>(column, update(IComplexFormulaGenerator.Create<T, TValue>())));
        return this;
    }

    public ColumnUpdates<T> AddProperty<TValue>(Expression<Func<T, TValue>> column, Expression<Func<T, TValue>> field)
    {
        Add(new ColumnUpdate<T, TValue>(column, ComplexFormulaGenerator.Property(field)));
        return this;
    }

    public ColumnUpdates<T> AddConstant<TValue>(Expression<Func<T, TValue>> column, TValue constant)
    {
        Add(new ColumnUpdate<T, TValue>(column, ComplexFormulaGenerator.Constant<T, TValue>(constant)));
        return this;
    }
}