// =============================================================================
// DEE Action: ASA_Scenario1_CheckNextGenManagerHasCapacity
// Scenario:   1 — Migrate to Another Automation Manager
// Stage:      Acceptance Gate (second gate, after ReadyDelay)
//
// Purpose:
//   Before migrating an Automation Controller Instance from mixing-manager-legacy
//   to mixing-manager-nextgen, verify that the target manager has sufficient
//   capacity to host an additional instance. If the manager is at capacity,
//   return false so the task stays at SkippedGateFailed and retries on the
//   next polling pass.
//
// Demo Notes:
//   - The capacity is defined as a MES configuration value (int) in /Cmf/Tutorials/AutomationScheduleAction/Scenario1/NumberOfAvailableSlots.
//  - For demo purposes, the capacity is decremented every time an instance is scheduled, simulating the reservation of a slot for that instance. In a real scenario, the DEE would likely just check the current number of instances running on the target manager against a predefined maximum capacity.
//   - To test the scenario, set the NumberOfAvailableSlots configuration value to 0
//
// DEE Contract:
//   Input  - Task : AutomationScheduledActionTask  (current task context)
//   Output - Result : Boolean  (true = capacity available, false = no capacity)
//
// Fail-closed: any exception or unexpected result must be treated as false.
// =============================================================================


using Cmf.Foundation.BusinessOrchestration.Abstractions;
using Cmf.Foundation.BusinessOrchestration.ConfigurationManagement.InputObjects;
using Cmf.Foundation.Common.Abstractions;
using Cmf.Foundation.Configuration.Abstractions;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

namespace Cmf.Custom.Tutorials.AutomationScheduleAction.Actions
{
    public class ASA_Scenario1_CheckNextGenManagerHasCapacity : DeeDevBase
    {
        public override bool DeeTestCondition(Dictionary<string, object> Input)
        {
            //---Start DEE Condition Code---

            return true;

            //---End DEE Condition Code---

        }

        public override Dictionary<string, object> DeeActionCode(Dictionary<string, object> Input)
        {
            //---Start DEE Code---
            UseReference("", "Cmf.Foundation.BusinessOrchestration.Abstractions");
            UseReference("", "Cmf.Foundation.BusinessOrchestration.ConfigurationManagement");
            UseReference("", "Cmf.Foundation.BusinessOrchestration.ConfigurationManagement.InputObjects");

            //Lock to ensure that only one is reserving a slot a the time
            lock(this.GetType())
            {
                IServiceProvider _svcProvider = Input["ServiceProvider"] as IServiceProvider;

                IEntityFactory _entFactory = _svcProvider.GetService<IEntityFactory>();

                const string configName = "NumberOfAvailableSlots";
                const string configParentPath = "/Cmf/Tutorials/AutomationScheduleAction/Scenario1";
                const string configFullPath = $"{configParentPath}/{configName}";

                IConfig nrSlotsConfig = _entFactory.Create<IConfig>();
                if (!nrSlotsConfig.TryLoad(configFullPath))
                {
                    nrSlotsConfig.Name =  configName;
                    nrSlotsConfig.ValueType = "System.Int32";
                    nrSlotsConfig.Value =  1; //Default to 1 slot if config doesn't exist (so that only a single instance can be scheduled until the config is set up properly)
                    nrSlotsConfig.Create(configParentPath);
                }

                int nrSlots = nrSlotsConfig.GetConfigValue<int>();

                if(nrSlots > 0)
                {
                    nrSlotsConfig.Value = nrSlots - 1;
                    nrSlotsConfig.Save();
                    Input["Result"] = true;
                }
                else
                {
                    Input["Result"] = false;
                }
            }

            //---End DEE Code---
            return Input;
        }
    }
}