using Comal.Classes;
using Comal.Stores;
using InABox.Core;
using InABox.Database;

namespace PRS.Shared.Database_Update_Scripts;

internal class Update_7_56 : DatabaseUpdateScript
{
    public override VersionNumber Version => new(7, 56);

    public override bool Update()
    {

        List<StockHolding> allholdings = new List<StockHolding>();
        
        Logger.Send(LogType.Information, "", $"- Loading Stock Movements");
        var movements = DbFactory.NewProvider(Logger.Main).Query(
            null,
            Columns.None<StockMovement>().Add(x => x.ID)
                .Add(x => x.Location.ID)
                .Add(x => x.Product.ID)
                .Add(x => x.Style.ID)
                .Add(x => x.Job.ID)
                .Add(x => x.Dimensions.Unit.ID)
                .Add(x => x.Dimensions.Quantity)
                .Add(x => x.Dimensions.Height)
                .Add(x => x.Dimensions.Width)
                .Add(x => x.Dimensions.Length)
                .Add(x => x.Dimensions.Weight)
                .Add(x => x.Dimensions.UnitSize)
                .Add(x => x.Dimensions.Value)
                .Add(x => x.JobRequisitionItem.ID)
                .Add(x => x.Units)
                .Add(x => x.Cost)
        );

        Logger.Send(LogType.Information, "", $"Processing {movements.Rows.Count} Stock Movements");
        foreach (var row in movements.Rows)
        {
            var movement = row.ToObject<StockMovement>();
            var holding = allholdings.FirstOrDefault(x =>
                (x.Product.ID == movement.Product.ID)
                && (x.Location.ID == movement.Location.ID)
                && (x.Style.ID == movement.Style.ID)
                && (x.Job.ID == movement.Job.ID)
                && (x.Dimensions.Unit.ID == movement.Dimensions.Unit.ID)
                && (x.Dimensions.UnitSize == movement.Dimensions.UnitSize)
            );
            if (holding == null)
            {
                holding = new();
                holding.Location.ID = movement.Location.ID;
                holding.Product.ID = movement.Product.ID;
                holding.Style.ID = movement.Style.ID;
                holding.Job.ID = movement.Job.ID;
                holding.Dimensions.CopyFrom(movement.Dimensions);
                allholdings.Add(holding);
            }

            holding.Units += movement.Units;
            holding.Qty += movement.Units * movement.Dimensions.Value;
            holding.Value += movement.Units * movement.Cost;
            holding.Available += (movement.JobRequisitionItem.ID == Guid.Empty ? movement.Units : 0.0);

            holding.Weight = holding.Qty * holding.Dimensions.Weight;
            holding.AverageValue = holding.Units != 0 ? holding.Value / holding.Units : 0.0F;
            
            if ((row.Index > 0) && (row.Index % 1000 == 0))
                Logger.Send(LogType.Information, "", $"Processed {row.Index} movements / {allholdings.Count} holdings");
            
        }
        if (movements.Rows.Count % 1000 != 0)
            Logger.Send(LogType.Information, "", $"Processed {movements.Rows.Count} movements / {allholdings.Count} holdings");

        var nonempty = allholdings.Where(x => Math.Abs(x.Units) >= 0.000001F).ToList();
        Logger.Send(LogType.Information, "", $"Saving {nonempty.Count} non-empty Stock Holdings");
        var updates = new List<StockHolding>();
        int i = 0;
        while (i < nonempty.Count)
        {
            updates.Add(nonempty[i]);
            if (updates.Count == 1000)
            {
                DbFactory.NewProvider(Logger.Main).Save(updates);
                Logger.Send(LogType.Information, "", $"Saved {i+1}/{nonempty.Count} Stock Holdings");
                updates.Clear();
            }
            i++;
        }
        if (updates.Any())
        {
            DbFactory.NewProvider(Logger.Main).Save(updates);
            Logger.Send(LogType.Information, "", $"Saved {nonempty.Count}/{nonempty.Count} Stock Holdings");
        }  

        return true;
    }
}