using System;
using Microsoft.EntityFrameworkCore;
using System.Linq;
using System.Collections.Generic;
using Oqtane.Modules;
using SZUAbsolventenverein.Module.PremiumArea.Models;

namespace SZUAbsolventenverein.Module.PremiumArea.Repository
{
    public interface IEngineerApplicationRepository
    {
        IEnumerable<EngineerApplication> GetEngineerApplications(int ModuleId);
        IEnumerable<EngineerApplication> GetEngineerApplications(int ModuleId, string status);
        EngineerApplication GetEngineerApplication(int ApplicationId);
        EngineerApplication GetEngineerApplication(int ApplicationId, bool tracking);
        EngineerApplication AddEngineerApplication(EngineerApplication EngineerApplication);
        EngineerApplication UpdateEngineerApplication(EngineerApplication EngineerApplication);
        void DeleteEngineerApplication(int ApplicationId);
    }

    public class EngineerApplicationRepository : IEngineerApplicationRepository, ITransientService
    {
        private readonly IDbContextFactory<PremiumAreaContext> _factory;

        public EngineerApplicationRepository(IDbContextFactory<PremiumAreaContext> factory)
        {
            _factory = factory;
        }

        public IEnumerable<EngineerApplication> GetEngineerApplications(int ModuleId)
        {
            using var db = _factory.CreateDbContext();
            return db.EngineerApplication.Where(item => item.ModuleId == ModuleId).ToList();
        }

        public IEnumerable<EngineerApplication> GetEngineerApplications(int ModuleId, string status)
        {
            using var db = _factory.CreateDbContext();
            return db.EngineerApplication.Where(item => item.ModuleId == ModuleId && item.Status == status).ToList();
        }

        public EngineerApplication GetEngineerApplication(int ApplicationId)
        {
            return GetEngineerApplication(ApplicationId, true);
        }

        public EngineerApplication GetEngineerApplication(int ApplicationId, bool tracking)
        {
            using var db = _factory.CreateDbContext();
            if (tracking)
            {
                return db.EngineerApplication.Find(ApplicationId);
            }
            else
            {
                return db.EngineerApplication.AsNoTracking()
                    .FirstOrDefault(item => item.ApplicationId == ApplicationId);
            }
        }

        public EngineerApplication AddEngineerApplication(EngineerApplication EngineerApplication)
        {
            using var db = _factory.CreateDbContext();
            try
            {
                EngineerApplication.CreatedBy = EngineerApplication.CreatedBy ?? "system";
                EngineerApplication.CreatedOn = DateTime.UtcNow;
                EngineerApplication.ModifiedBy = EngineerApplication.ModifiedBy ?? "system";
                EngineerApplication.ModifiedOn = DateTime.UtcNow;
                db.EngineerApplication.Add(EngineerApplication);
                db.SaveChanges();
            }
            catch (Exception ex)
            {
                // Throwing a new exception with more details so it's visible
                var msg = $"DB Error: {ex.Message} | Inner: {ex.InnerException?.Message}";
                Console.WriteLine(msg); // Log to console for dotnet run
                throw new Exception(msg, ex);
            }

            return EngineerApplication;
        }

        public EngineerApplication UpdateEngineerApplication(EngineerApplication EngineerApplication)
        {
            using var db = _factory.CreateDbContext();
            try
            {
                var existing = db.EngineerApplication.Find(EngineerApplication.ApplicationId);
                if (existing != null)
                {
                    existing.FileId = EngineerApplication.FileId;
                    existing.Status = EngineerApplication.Status;
                    existing.SubmittedOn = EngineerApplication.SubmittedOn;
                    existing.ApprovedOn = EngineerApplication.ApprovedOn;

                    existing.ModifiedBy = EngineerApplication.ModifiedBy ?? "system";
                    existing.ModifiedOn = DateTime.UtcNow;
                    db.SaveChanges();
                }
            }
            catch (Exception ex)
            {
                var msg = $"DB Error (Update): {ex.Message} | Inner: {ex.InnerException?.Message}";
                Console.WriteLine(msg);
                throw new Exception(msg, ex);
            }

            return EngineerApplication;
        }

        public void DeleteEngineerApplication(int ApplicationId)
        {
            using var db = _factory.CreateDbContext();
            EngineerApplication EngineerApplication = db.EngineerApplication.Find(ApplicationId);
            db.EngineerApplication.Remove(EngineerApplication);
            db.SaveChanges();
        }
    }
}