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

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
                .Include(batch => batch.TemplateSelections)
                .ThenInclude(selection => selection.TemplateVersion)
                .ThenInclude(version => version.Template)
                .Include(batch => batch.TargetAssignments)
                .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 requestedTemplateVersionId = deploymentBatch.TemplateSelections
                .OrderBy(selection => selection.SortOrder)
                .Select(selection => (Guid?)selection.TemplateVersionId)
                .FirstOrDefault();

            var templateVersion = requestedTemplateVersionId.HasValue
                ? _context.TemplateVersions
                    .Include(version => version.Template)
                    .ThenInclude(template => template.TemplateCategory)
                    .ThenInclude(category => category.Service)
                    .FirstOrDefault(version => version.Id == requestedTemplateVersionId.Value)
                : null;

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

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

            deploymentBatch.TemplateId = template.Id;

            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>())
                .Concat(deploymentBatch.TargetAssignments.Select(assignment => assignment.TargetId))
                .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 (deploymentBatch.TemplateSelections.Count == 0)
            {
                templateVersion ??= template.TemplateVersions?
                    .OrderByDescending(version => version.IsPublished)
                    .ThenByDescending(version => version.PublishedAt)
                    .ThenByDescending(version => version.Created)
                    .FirstOrDefault();

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

                deploymentBatch.TemplateSelections.Add(new DeploymentTemplateSelectionModel
                {
                    Id = Guid.NewGuid(),
                    DeploymentGroupId = deploymentBatch.Id,
                    TemplateVersionId = templateVersion.Id,
                    TemplateRole = "Service",
                    SortOrder = 10,
                    Alias = template.Name
                });
            }

            if (deploymentBatch.TargetAssignments.Count == 0)
            {
                var sortOrder = 10;
                foreach (var targetId in selectedTargetIds)
                {
                    var targetName = _context.Targets
                        .Where(target => target.Id == targetId)
                        .Select(target => target.Name)
                        .FirstOrDefault();

                    deploymentBatch.TargetAssignments.Add(new DeploymentTargetAssignmentModel
                    {
                        Id = Guid.NewGuid(),
                        DeploymentGroupId = deploymentBatch.Id,
                        TargetId = targetId,
                        RoleKey = "Node",
                        SortOrder = sortOrder,
                        NodeDataJson = JsonSerializer.Serialize(new { nodeName = targetName ?? targetId.ToString() })
                    });
                    sortOrder += 10;
                }
            }

            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 templateSelections = _context.DeploymentTemplateSelections
                .Where(existing => existing.DeploymentGroupId == deploymentBatch.Id)
                .ToList();
            var parameterValues = _context.DeploymentParameterValues
                .Where(existing => existing.DeploymentGroupId == deploymentBatch.Id)
                .ToList();
            var targetAssignments = _context.DeploymentTargetAssignments
                .Where(existing => existing.DeploymentGroupId == deploymentBatch.Id)
                .ToList();
            var deployments = _context.Deployments
                .Where(existing => existing.DeploymentGroupId == deploymentBatch.Id)
                .ToList();

            if (parameterValues.Count > 0)
            {
                _context.DeploymentParameterValues.RemoveRange(parameterValues);
            }

            if (targetAssignments.Count > 0)
            {
                _context.DeploymentTargetAssignments.RemoveRange(targetAssignments);
            }

            if (templateSelections.Count > 0)
            {
                _context.DeploymentTemplateSelections.RemoveRange(templateSelections);
            }

            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;
        }
    }
}