using AutoMapper;
using Microsoft.AspNetCore.Mvc;
using Microsoft.SelfService.Portal.Core.API.Dto.Deployment.Add;
using Microsoft.SelfService.Portal.Core.API.Dto.Deployment.Get;
using Microsoft.SelfService.Portal.Core.API.Dto.Deployment.Edit;
using Microsoft.SelfService.Portal.Core.API.Interfaces;
using Microsoft.SelfService.Portal.Core.API.Models;
using Microsoft.SelfService.Portal.Core.API.Context;

using Microsoft.SelfService.Portal.Core.API.Events.Interfaces;
using System.Reflection;
using System.Collections;
using System.Dynamic;
using System.Text.Json;
using Microsoft.EntityFrameworkCore;

namespace Microsoft.SelfService.Portal.Core.API.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class DeploymentController : Controller
    {
        private readonly IDeploymentInterface _deploymentInterface;
        private readonly IQueueJobService _queueJobService;
        private readonly DataContext _context;
        private readonly IMapper _mapper;
        private readonly IEventHandlerInterface _eventHandlerInterface;

        public DeploymentController(
            IDeploymentInterface deploymentInterface,
            IQueueJobService queueJobService,
            DataContext context,
            IMapper mapper,
            IEventHandlerInterface eventHandlerInterface)
        {
            _deploymentInterface = deploymentInterface;
            _queueJobService = queueJobService;
            _context = context;
            _mapper = mapper;
            _eventHandlerInterface = eventHandlerInterface;
        }

        [HttpGet]
        [ProducesResponseType(200, Type = typeof(IEnumerable<DeploymentModel>))]
        public IActionResult GetDeployments()
        {
            var deployment = _mapper.Map<List<GetDeploymentDto>>(_deploymentInterface.GetDeployments());

            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            return Ok(deployment);
        }

        [HttpGet("{Id}")]
        [ProducesResponseType(200, Type = typeof(DeploymentModel))]
        [ProducesResponseType(400)]
        public IActionResult GetDeploymentById(Guid Id)
        {

            if (!_deploymentInterface.CheckDeploymentById(Id))
                return NotFound();

            var deployment = _mapper.Map<GetDeploymentDetailsDto>(_deploymentInterface.GetDeploymentById(Id));

            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            return Ok(deployment);
        }

        [HttpPost]
        [ProducesResponseType(204)]
        [ProducesResponseType(400)]
        public IActionResult AddDeploymentById([FromBody] AddDeploymentDto deployment)
        {

            if (deployment == null)
                return BadRequest(ModelState);

            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            var deploymentMap = _mapper.Map<DeploymentModel>(deployment);

            if (!_deploymentInterface.AddDeploymentById(deploymentMap))
            {
                ModelState.AddModelError("", "Something went wrong while saving");
                return StatusCode(500, ModelState);
            }

            return Ok(deploymentMap.Id);
        }

        [HttpPost("Request")]
        [ProducesResponseType(200)]
        [ProducesResponseType(400)]
        public IActionResult AddDeploymentRequest([FromBody] AddDeploymentRequestDto request)
        {
            if (request == null)
                return BadRequest(ModelState);

            if (request.VirtualMachineIds == null || request.VirtualMachineIds.Count == 0)
            {
                ModelState.AddModelError("", "At least one VirtualMachine must be selected.");
                return BadRequest(ModelState);
            }

            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            try
            {
                var queueJobId = _queueJobService.EnqueueDeploymentRequest(
                    request.DeploymentGroupId,
                    request.VirtualMachineIds,
                    request.JsonData);

                return Ok(queueJobId);
            }
            catch (InvalidOperationException ex)
            {
                ModelState.AddModelError("", ex.Message);
                return BadRequest(ModelState);
            }
        }

        [HttpGet("QueueJobs")]
        [ProducesResponseType(200, Type = typeof(IEnumerable<GetQueueJobDto>))]
        public IActionResult GetQueueJobs()
        {
            var queueJobs = _context.QueueJobs
                .AsNoTracking()
                .Include(job => job.Targets)
                .Include(job => job.Steps)
                .OrderByDescending(job => job.Created)
                .Select(job => new GetQueueJobDto
                {
                    Id = job.Id,
                    Type = job.Type,
                    Status = job.Status,
                    Attempts = job.Attempts,
                    MaxAttempts = job.MaxAttempts,
                    Started = job.Started,
                    Finished = job.Finished,
                    ErrorMessage = job.ErrorMessage,
                    TargetCount = job.Targets.Count,
                    SucceededTargetCount = job.Targets.Count(target => target.Status == QueueJobStatus.Succeeded),
                    FailedTargetCount = job.Targets.Count(target => target.Status == QueueJobStatus.Failed)
                })
                .ToList();

            return Ok(queueJobs);
        }

        [HttpGet("QueueJobs/{Id}")]
        [ProducesResponseType(200, Type = typeof(GetQueueJobDetailsDto))]
        [ProducesResponseType(404)]
        public IActionResult GetQueueJobById(Guid Id)
        {
            var queueJob = _context.QueueJobs
                .AsNoTracking()
                .Include(job => job.Targets)
                .Include(job => job.Steps)
                .FirstOrDefault(job => job.Id == Id);

            if (queueJob == null)
                return NotFound();

            var details = new GetQueueJobDetailsDto
            {
                Id = queueJob.Id,
                Type = queueJob.Type,
                Status = queueJob.Status,
                PayloadJson = queueJob.PayloadJson,
                Attempts = queueJob.Attempts,
                MaxAttempts = queueJob.MaxAttempts,
                Started = queueJob.Started,
                Finished = queueJob.Finished,
                ErrorMessage = queueJob.ErrorMessage,
                MetadataJson = queueJob.MetadataJson,
                RuleSnapshotJson = queueJob.RuleSnapshotJson,
                Created = queueJob.Created,
                CreatedBy = queueJob.CreatedBy,
                Modified = queueJob.Modified,
                ModifiedBy = queueJob.ModifiedBy,
                Targets = queueJob.Targets.Select(target => new GetQueueJobTargetDto
                {
                    Id = target.Id,
                    VirtualMachineId = target.VirtualMachineId,
                    DeploymentGroupId = target.DeploymentGroupId,
                    TemplateId = target.TemplateId,
                    Status = target.Status,
                    Attempts = target.Attempts,
                    ErrorMessage = target.ErrorMessage
                }).ToList(),
                Steps = queueJob.Steps
                    .OrderBy(step => step.SortOrder)
                    .Select(step => new GetQueueJobStepDto
                {
                    Id = step.Id,
                    DependsOnQueueJobStepId = step.DependsOnQueueJobStepId,
                    SortOrder = step.SortOrder,
                    Name = step.Name,
                    StepType = step.StepType,
                    Status = step.Status,
                    MetadataJson = step.MetadataJson,
                    ApprovedAt = step.ApprovedAt,
                    ApprovedBy = step.ApprovedBy,
                    ApprovalComment = step.ApprovalComment
                }).ToList()
            };

            return Ok(details);
        }

        [HttpPost("QueueJobs/{Id}/Retry")]
        [ProducesResponseType(204)]
        [ProducesResponseType(404)]
        public IActionResult RetryQueueJob(Guid Id)
        {
            if (!_queueJobService.RetryQueueJob(Id))
                return NotFound();

            return NoContent();
        }

        [HttpPost("QueueJobs/Steps/{stepId}/Approve")]
        [ProducesResponseType(204)]
        [ProducesResponseType(404)]
        public IActionResult ApproveQueueJobStep(Guid stepId, [FromBody] QueueJobStepApprovalDto? payload)
        {
            var approvedBy = payload?.ApprovedBy ?? User?.Identity?.Name ?? "System";
            if (!_queueJobService.ApproveQueueJobStep(stepId, approvedBy, payload?.Comment))
                return NotFound();

            return NoContent();
        }

        [HttpPost("QueueJobs/Steps/{stepId}/Reject")]
        [ProducesResponseType(204)]
        [ProducesResponseType(404)]
        public IActionResult RejectQueueJobStep(Guid stepId, [FromBody] QueueJobStepApprovalDto? payload)
        {
            var approvedBy = payload?.ApprovedBy ?? User?.Identity?.Name ?? "System";
            if (!_queueJobService.RejectQueueJobStep(stepId, approvedBy, payload?.Comment))
                return NotFound();

            return NoContent();
        }

        [HttpDelete("{Id}")]
        [ProducesResponseType(204)]
        [ProducesResponseType(400)]
        [ProducesResponseType(404)]
        public IActionResult DeleteDeploymentById(Guid Id)
        {
            if (!_deploymentInterface.CheckDeploymentById(Id))
                return NotFound();

            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            var deployment = _deploymentInterface.GetDeploymentById(Id);

            if (!_deploymentInterface.DeleteDeploymentById(deployment))
            {
                ModelState.AddModelError("", "Something went wrong while deleting");
                return StatusCode(500, ModelState);
            }
            return NoContent();
        }

        [HttpPut("{Id}")]
        [ProducesResponseType(204)]
        [ProducesResponseType(400)]
        [ProducesResponseType(404)]
        public IActionResult EditDeploymentById(Guid Id, [FromBody] EditDeploymentDto deployment)
        {
            if (deployment == null)
                return BadRequest(ModelState);

            if (!_deploymentInterface.CheckDeploymentById(Id))
                return NotFound();

            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            var deploymentMap = _mapper.Map<DeploymentModel>(deployment);
            deploymentMap.Id = Id;

            if (!_deploymentInterface.EditDeploymentById(deploymentMap))
            {
                ModelState.AddModelError("", "Something went wrong");
                return StatusCode(500, ModelState);
            }

            _eventHandlerInterface.FireEvent(this.GetType().Name, MethodBase.GetCurrentMethod().Name, Id);
            
            return NoContent();
        }
    }
}