using System;
using System.Collections.Generic;
using System.Linq;
using Manager.Helpers;
using Manager.Services;
using ManagerService.Data;
using ManagerService.DTOs;
using ManagerService.Helpers;
using ManagerService.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using NSwag.Annotations;

namespace ManagerService.Controllers
{
    [Authorize] // TODO Add ROLES (Roles = "Admin")
    [ApiController, Route("api/[controller]")]
    [OpenApiTag("Instance", Description = "Application instance management")]
    public class ApplicationInstanceController : ControllerBase
    {
        private readonly MyInfoMateDbContext _myInfoMateDbContext;

        private InstanceDatabaseService _instanceService;
        private UserDatabaseService _userService;
        private readonly ILogger<ApplicationInstanceController> _logger;
        private readonly ProfileLogic _profileLogic;
        IHexIdGeneratorService idService = new HexIdGeneratorService();

        public ApplicationInstanceController(ILogger<ApplicationInstanceController> logger, InstanceDatabaseService instanceService, UserDatabaseService userService, ProfileLogic profileLogic, MyInfoMateDbContext myInfoMateDbContext)
        {
            _logger = logger;
            _instanceService = instanceService;
            _userService = userService;
            _profileLogic = profileLogic;
            _myInfoMateDbContext = myInfoMateDbContext;
        }

        /// <summary>
        /// Get a list of all applicationInstance (summary)
        /// </summary>
        /// <param name="id">instance id</param>  
        [AllowAnonymous]
        [ProducesResponseType(typeof(List<ApplicationInstanceDTO>), 200)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpGet]
        public ObjectResult Get([FromQuery] string instanceId)
        {
            try
            {
                List<ApplicationInstance> applicationInstances = _myInfoMateDbContext.ApplicationInstances.Where(ai => ai.InstanceId == instanceId).ToList();

                return new OkObjectResult(applicationInstances.Select(ai => ai.ToDTO()).OrderBy(c => c.appType));
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Create a new application instance
        /// </summary>
        /// <param name="newApplicationInstanceDTO">New application instance info</param>  
        [ProducesResponseType(typeof(ApplicationInstanceDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 409)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPost]
        public ObjectResult Create([FromBody] ApplicationInstanceDTO newApplicationInstanceDTO)
        {
            try
            {
                if (newApplicationInstanceDTO == null)
                    throw new ArgumentNullException("Application instance param is null");

                // Todo add some verification ? 
                ApplicationInstance applicationInstance = new ApplicationInstance();
                applicationInstance.FromDTO(newApplicationInstanceDTO);
                applicationInstance.Id = idService.GenerateHexId();

                _myInfoMateDbContext.ApplicationInstances.Add(applicationInstance);

                _myInfoMateDbContext.SaveChanges();

                return new OkObjectResult(applicationInstance.ToDTO());
            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) { };
            }
            catch (InvalidOperationException ex)
            {
                return new ConflictObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Update an application instance
        /// </summary>
        /// <param name="updatedApplicationInstanceDTO">application instance to update</param>  
        [ProducesResponseType(typeof(ApplicationInstanceDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPut]
        public ObjectResult Update([FromBody] ApplicationInstanceDTO updatedApplicationInstanceDTO)
        {
            try
            {
                if (updatedApplicationInstanceDTO == null)
                    throw new ArgumentNullException("application instance param is null");

                ApplicationInstance applicationInstance = _myInfoMateDbContext.ApplicationInstances.FirstOrDefault(ai => ai.Id == updatedApplicationInstanceDTO.id); 

                if (applicationInstance == null)
                    throw new KeyNotFoundException("application instance does not exist");

                applicationInstance.FromDTO(updatedApplicationInstanceDTO);
                _myInfoMateDbContext.SaveChanges();

                return new OkObjectResult(applicationInstance.ToDTO());
            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) {};
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) {};
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Delete an application instance
        /// </summary>
        /// <param name="id">Id of application instance to delete</param>  
        [ProducesResponseType(typeof(string), 202)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpDelete("{id}")]
        public ObjectResult Delete(string id)
        {
            try
            {
                if (id == null)
                    throw new ArgumentNullException("application instance param is null");

                ApplicationInstance applicationInstance = _myInfoMateDbContext.ApplicationInstances.FirstOrDefault(ai => ai.Id == id);

                if (applicationInstance == null)
                    throw new KeyNotFoundException("application instance does not exist");

                //_instanceService.Remove(id);
                _myInfoMateDbContext.ApplicationInstances.Remove(applicationInstance);

                _myInfoMateDbContext.SaveChanges();

                return new ObjectResult("The application instance has been deleted") { StatusCode = 202 };

            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) { };
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Create a new application Link to specified application instance
        /// </summary>
        /// <param name="applicationInstanceId">Application instance id</param>  
        /// <param name="appConfigurationLinkDTO">Info to link config and application instance</param>  
        [ProducesResponseType(typeof(AppConfigurationLinkDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 409)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPost("{applicationInstanceId}/application-link")]
        public ObjectResult AddConfigurationToApplicationInstance(string applicationInstanceId, [FromBody] AppConfigurationLinkDTO appConfigurationLinkDTO)
        {
            try
            {
                if (applicationInstanceId == null)
                    throw new ArgumentNullException("Application instance param is null");

                if (appConfigurationLinkDTO == null)
                    throw new ArgumentNullException("Configuration param is null");

                ApplicationInstance applicationInstance = _myInfoMateDbContext.ApplicationInstances.Include(ai => ai.Configurations).FirstOrDefault(ai => ai.Id == applicationInstanceId);

                if (applicationInstance == null)
                    throw new KeyNotFoundException("This application instance was not found");

                Configuration configuration = _myInfoMateDbContext.Configurations.FirstOrDefault(c => c.Id == appConfigurationLinkDTO.configurationId);

                if (configuration == null)
                    throw new KeyNotFoundException("This configuration was not found");

                // Todo add some verification ? 
                AppConfigurationLink appConfigurationLink = new AppConfigurationLink();
                appConfigurationLink.Id = idService.GenerateHexId();
                appConfigurationLink.FromDTO(appConfigurationLinkDTO);

                _myInfoMateDbContext.AppConfigurationLinks.Add(appConfigurationLink);
                _myInfoMateDbContext.SaveChanges();

                return new OkObjectResult(appConfigurationLink.ToDTO());
            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) { };
            }
            catch (InvalidOperationException ex)
            {
                return new ConflictObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Remove configuration from instance
        /// </summary>
        /// <param name="applicationInstanceId">Application instance id</param>  
        /// <param name="appConfigurationLinkId">AppConfiguration id</param>  
        [ProducesResponseType(typeof(string), 202)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpDelete("{applicationInstanceId}/application-link/{appConfigurationLinkId}")]
        public ObjectResult DeleteAppConfigurationLink(string applicationInstanceId, string appConfigurationLinkId)
        {
            try
            {
                if (applicationInstanceId == null)
                    throw new ArgumentNullException("application instance param is null");

                if (appConfigurationLinkId == null)
                    throw new ArgumentNullException("Configuration param is null");

                ApplicationInstance applicationInstance = _myInfoMateDbContext.ApplicationInstances.FirstOrDefault(ai => ai.Id == applicationInstanceId);

                if (applicationInstance == null)
                    throw new KeyNotFoundException("application instance does not exist");

                AppConfigurationLink appConfigurationLink = _myInfoMateDbContext.AppConfigurationLinks.FirstOrDefault(acl => acl.Id == appConfigurationLinkId);

                if (appConfigurationLink == null)
                    throw new KeyNotFoundException("This app configuration link was not found");

                _myInfoMateDbContext.AppConfigurationLinks.Remove(appConfigurationLink);
                _myInfoMateDbContext.SaveChanges();

                return new ObjectResult("The app configuration link has been deleted") { StatusCode = 202 };
            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) { };
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }
    }
}