using Mapster;
using Microsoft.EntityFrameworkCore;
using Persistence.Database.Model;
using Persistence.Models;
using Persistence.Repositories;

namespace Persistence.Repository.Repositories;
public class ChangeLogRepository : IChangeLogRepository
{
    private DbContext db;

    public ChangeLogRepository(DbContext db)
    {
        this.db = db;
    }

    public async Task<int> Clear(Guid idUser, Guid idDiscriminator, CancellationToken token)
    {
        var updateTime = DateTimeOffset.UtcNow;

        var dbSet = db.Set<ChangeLog>();
        var query = dbSet
            .Where(s => s.IdDiscriminator == idDiscriminator)
            .Where(e => e.Obsolete == null);

        var entitiesToDelete = await query.ToArrayAsync(token);

        foreach (var entity in entitiesToDelete)
        {
            entity.Obsolete = updateTime;
            entity.IdEditor = idUser;
        }

        return await db.SaveChangesAsync(token);
    }

    public async Task<int> ClearAndInsertRange(Guid idUser, Guid idDiscriminator, IEnumerable<DataWithWellDepthAndSectionDto> dtos, CancellationToken token)
    {
        var result = 0;
        using var transaction = await db.Database.BeginTransactionAsync(token);
        try
        {
            result += await Clear(idUser, idDiscriminator, token);
            result += await InsertRange(idUser, idDiscriminator, dtos, token);

            await transaction.CommitAsync(token);
            return result;
        }
        catch
        {
            await transaction.RollbackAsync(token);
            throw;
        }
    }

    public async Task<IEnumerable<ChangeLogDto>> GetChangeLogForDate(Guid idDiscriminator, DateTimeOffset dateBegin, DateTimeOffset dateEnd, CancellationToken token)
    {
        var dbSet = db.Set<ChangeLog>();
        var query = dbSet.Where(s => s.IdDiscriminator == idDiscriminator);

        var min = dateBegin;
        var max = dateEnd;

        var createdQuery = query.Where(e => e.Creation >= min && e.Creation <= max);
        var editedQuery = query.Where(e => e.Obsolete != null && e.Obsolete >= min && e.Obsolete <= max);

        query = createdQuery.Union(editedQuery);
        var entities = await query.ToListAsync(token);

        var dtos = entities.Select(e => new ChangeLogDto
        {
            Creation = e.Creation,
            IdAuthor = e.IdAuthor,
            IdEditor = e.IdEditor,
            IdNext = e.IdNext,
            Obsolete = e.Obsolete,
            Value = new DataWithWellDepthAndSectionDto()
            {
                Value = e.Value,
                IdSection = e.IdSection,
                Id = e.Id,
                DepthEnd = e.DepthEnd,
                DepthStart = e.DepthStart
            }
        });

        return dtos;
    }

    public async Task<IEnumerable<DataWithWellDepthAndSectionDto>> GetByDate(Guid idDiscriminator, DateTimeOffset momentUtc, CancellationToken token)
    {
        var dbSet = db.Set<ChangeLog>();
        var dbQuery = dbSet
            .Where(s => s.IdDiscriminator == idDiscriminator)
            .Where(e => e.Creation <= momentUtc)
            .Where(e => e.Obsolete == null || e.Obsolete >= momentUtc);

        var entities = await dbQuery.ToArrayAsync(token);
        var dtos = entities.Select(e => e.Adapt<DataWithWellDepthAndSectionDto>());

        return dtos;
    }

    public Task<IEnumerable<DateOnly>> GetDatesChange(CancellationToken token)
    {
        throw new NotImplementedException();
    }

    public Task<IEnumerable<IDictionary<string, object>>> GetGtDate(DateTimeOffset dateBegin, CancellationToken token)
    {
        throw new NotImplementedException();
    }

    public Task<int> InsertRange(Guid idUser, Guid idDiscriminator, IEnumerable<DataWithWellDepthAndSectionDto> dtos, CancellationToken token)
    {
        foreach (var dto in dtos)
        {
            var entity = CreateEntityFromDto(idUser, idDiscriminator, dto);
            db.Set<ChangeLog>().Add(entity);
        }

        var result = db.SaveChangesAsync(token);

        return result;
    }

    private ChangeLog CreateEntityFromDto(Guid idUser, Guid idDiscriminator, DataWithWellDepthAndSectionDto dto)
    {
        var entity = new ChangeLog()
        {
            Id = default,
            Creation = DateTimeOffset.UtcNow,
            IdAuthor = idUser,
            IdDiscriminator = idDiscriminator,
            IdEditor = idUser,

            Value = dto.Value,
            IdSection = dto.IdSection,
            DepthStart = dto.DepthStart,
            DepthEnd = dto.DepthEnd,
        };

        return entity;
    }

    public async Task<int> MarkAsDeleted(Guid idUser, IEnumerable<Guid> ids, CancellationToken token)
    {
        var result = 0;
        var dbSet = db.Set<ChangeLog>();

        var updatedEntity = dbSet
           .Where(s => ids.Contains(s.Id))
           .FirstOrDefault();
        if (updatedEntity != null)
        {
            updatedEntity.Obsolete = DateTimeOffset.UtcNow;

            result = await db.SaveChangesAsync(token);
        }

        return result;
    }

    public Task<int> UpdateOrInsertRange(int idUser, IEnumerable<IDictionary<string, object>> dtos, CancellationToken token)
    {
        throw new NotImplementedException();
    }

    public async Task<int> UpdateRange(Guid idUser, Guid idDiscriminator, IEnumerable<DataWithWellDepthAndSectionDto> dtos, CancellationToken token)
    {
        var dbSet = db.Set<ChangeLog>();

        var updatedIds = dtos.Select(d => d.Id);
        var updatedEntities = dbSet
            .Where(s => updatedIds.Contains(s.Id))
            .ToDictionary(s => s.Id);
        //todo
        foreach (var dto in dtos)
        {
            var newEntity = CreateEntityFromDto(idUser, idDiscriminator, dto);
            dbSet.Add(newEntity);

            var updatedEntity = updatedEntities.GetValueOrDefault(dto.Id)!;
            updatedEntity.IdNext = newEntity.Id;
            updatedEntity.Obsolete = DateTimeOffset.UtcNow;
            updatedEntity.IdEditor = idUser;

        }

        var result = await db.SaveChangesAsync(token);

        return result;
    }
}