using Microsoft.EntityFrameworkCore;
using Microsoft.SelfService.Portal.Core.API.Context;
using Microsoft.SelfService.Portal.Core.API.Interfaces;
using Microsoft.SelfService.Portal.Core.API.Models;

namespace Microsoft.SelfService.Portal.Core.API.Repository
{
    public class DeploymentBatchRepository : IDeploymentBatchInterface
    {
        private readonly DataContext _context;

        public DeploymentBatchRepository(DataContext context)
        {
            _context = context;
        }

        public ICollection<DeploymentGroupModel> GetDeploymentBatches()
        {
            return _context.DeploymentGroups.ToList();
        }

        public DeploymentGroupModel? GetDeploymentBatchById(Guid id)
        {
            return _context.DeploymentGroups
                .Include(t => t.Template)
                .ThenInclude(tc => tc.TemplateCategory)
                .ThenInclude(s => s.Service)
                .Include(d => d.Deployments)
                .ThenInclude(vm => vm.Target)
                .Include(batch => batch.TemplateSelections)
                .ThenInclude(selection => selection.TemplateVersion)
                .Include(batch => batch.ParameterValues)
                .Include(batch => batch.TargetAssignments)
                .ThenInclude(target => target.Target)
                .Where(dg => dg.Id == id).FirstOrDefault();
        }

        public bool AddDeploymentBatchById(DeploymentGroupModel deploymentBatch, ICollection<Guid>? targetIds)
        {
            if (deploymentBatch.Id == Guid.Empty)
            {
                deploymentBatch.Id = Guid.NewGuid();
            }

            var template = _context.Templates
                .Include(existing => existing.TemplateCategory)
                .ThenInclude(existing => existing.Service)
                .FirstOrDefault(existing => existing.Id == deploymentBatch.TemplateId);

            if (template == null)
            {
                return false;
            }

            if (deploymentBatch.DeploymentRuleId.HasValue)
            {
                var ruleExists = _context.DeploymentRules.Any(existing => existing.Id == deploymentBatch.DeploymentRuleId.Value);
                if (!ruleExists)
                {
                    return false;
                }
            }

            var isCloudService = template.TemplateCategory.Service.IsCloudService;
            var selectedTargetIds = (targetIds ?? Array.Empty<Guid>())
                .Distinct()
                .ToList();

            if (!isCloudService && selectedTargetIds.Count == 0)
            {
                return false;
            }

            if (selectedTargetIds.Count > 0)
            {
                var existingTargetIds = _context.Targets
                    .Where(existing => selectedTargetIds.Contains(existing.Id))
                    .Select(existing => existing.Id)
                    .ToHashSet();

                if (existingTargetIds.Count != selectedTargetIds.Count)
                {
                    return false;
                }
            }

            _context.Add(deploymentBatch);

            if (!SaveChanges())
            {
                return false;
            }

            if (!isCloudService)
            {
                foreach (var targetId in selectedTargetIds)
                {
                    _context.Deployments.Add(new DeploymentModel
                    {
                        DeploymentGroupId = deploymentBatch.Id,
                        TargetId = targetId,
                        Status = QueueJobStatus.Pending,
                        JSONData = "{}"
                    });
                }

                return SaveChanges();
            }

            return true;
        }

        public bool DeleteDeploymentBatchById(DeploymentGroupModel deploymentBatch)
        {
            var deployments = _context.Deployments
                .Where(existing => existing.DeploymentGroupId == deploymentBatch.Id)
                .ToList();

            if (deployments.Count > 0)
            {
                _context.Deployments.RemoveRange(deployments);
            }

            _context.Remove(deploymentBatch);
            return SaveChanges();
        }

        public bool EditDeploymentBatchById(DeploymentGroupModel deploymentBatch)
        {
            _context.Update(deploymentBatch);
            return SaveChanges();
        }

        public bool CheckDeploymentBatchById(Guid id)
        {
            return _context.DeploymentGroups
                   .Any(d => d.Id == id);
        }

        public bool SaveChanges()
        {
            var saved = _context.SaveChanges();
            return saved > 0 ? true : false;
        }
    }
}