using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Manager.Interfaces.DTO;
using Manager.Interfaces.Models;
using Manager.Services;
using ManagerService.Service.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using NSwag.Annotations;

namespace ManagerService.Controllers
{
    [Authorize] // TODO Add ROLES (Roles = "Admin")
    [ApiController, Route("api/[controller]")]
    [OpenApiTag("Resource", Description = "Resource management")]
    public class ResourceController : ControllerBase
    {
        private ResourceDatabaseService _resourceService;
        private SectionDatabaseService _sectionService;
        private ConfigurationDatabaseService _configurationService;
        private readonly ILogger<ResourceController> _logger;

        public ResourceController(ILogger<ResourceController> logger, ResourceDatabaseService resourceService, SectionDatabaseService sectionService, ConfigurationDatabaseService configurationService)
        {
            _logger = logger;
            _resourceService = resourceService;
            _sectionService = sectionService;
            _configurationService = configurationService;
        }

        /// <summary>
        /// Get a list of all resources (summary)
        /// </summary>
        /// <param name="id">id instance</param>  
        [ProducesResponseType(typeof(List<ResourceDTO>), 200)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpGet]
        public ObjectResult Get([FromQuery] string instanceId)
        {
            try
            {
                List<Resource> resources = _resourceService.GetAll(instanceId);

                return new OkObjectResult(resources.Select(r => r.ToDTO(r.Type == ResourceType.ImageUrl)));
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }


        /// <summary>
        /// Get a specific resource 
        /// </summary>
        /// <param name="id">id resource</param>  
        [AllowAnonymous]
        [ProducesResponseType(typeof(ResourceDTO), 200)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpGet("{id}/detail")]
        public ObjectResult GetDetail(string id)
        {
            try
            {
                Resource resource = _resourceService.GetById(id);

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

                return new OkObjectResult(resource.ToDTO(resource.Type == ResourceType.ImageUrl));
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) {};
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Show a specific resource (as a picture or video stream)
        /// </summary>
        /// <param name="id">id resource</param>  
        [AllowAnonymous]
        [ProducesResponseType(typeof(FileResult), 200)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpGet("{id}")]
        public ActionResult Show(string id)
        {
            try
            {
                Resource resource = _resourceService.GetById(id);

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

                var file = Convert.FromBase64String(resource.Data);

                if (resource.Type == ResourceType.Image)
                {
                    return new FileContentResult(file, "image/png");
                }
                if (resource.Type == ResourceType.Video)
                {
                    return new FileContentResult(file, "application/octet-stream");
                }

                return new FileContentResult(file, "image/png");
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Upload a specific resource (picture or video)
        /// </summary> 
        [ProducesResponseType(typeof(string), 200)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPost("upload"), DisableRequestSizeLimit]
        public IActionResult Upload([FromForm] string label, [FromForm] string type, [FromForm] string instanceId) // Create but with local //[FromBody] ResourceDetailDTO uploadResource
        {
            try
            {
                if (label == null || type == null || instanceId == null)
                    throw new ArgumentNullException("One of resource params is null");

                List<Resource> resources = new List<Resource>();

                foreach (var file in Request.Form.Files) 
                {
                    if (file.Length > 0)
                    {
                        var stringResult = "";
                        if (file.Length > 0)
                        {
                            using (var ms = new MemoryStream())
                            {
                                file.CopyTo(ms);
                                var fileBytes = ms.ToArray();
                                stringResult = Convert.ToBase64String(fileBytes);
                            }
                        }
                        // Todo add some verification ? 
                        Resource resource = new Resource();
                        resource.Label = label;
                        resource.Type = (ResourceType)Enum.Parse(typeof(ResourceType), type);
                        resource.DateCreation = DateTime.Now;
                        resource.Data = stringResult;
                        resource.InstanceId = instanceId;
                        Resource resourceCreated = _resourceService.Create(resource);
                        resources.Add(resourceCreated);
                    }
                }
                return Ok(resources.Select(r => r.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>
        /// Create a new resource
        /// </summary>
        /// <param name="newResource">New resource info</param>  
        [ProducesResponseType(typeof(ResourceDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 409)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPost]
        public ObjectResult Create([FromBody] ResourceDTO newResource)
        {
            try
            {
                if (newResource == null)
                    throw new ArgumentNullException("Resource param is null");

                // Todo add some verification ? 
                Resource resource = new Resource();
                resource.InstanceId = newResource.instanceId;
                resource.Label = newResource.label;
                resource.Type = newResource.type;
                resource.DateCreation = DateTime.Now;
                resource.Data = newResource.data;
                resource.InstanceId = newResource.instanceId;

                Resource resourceCreated = _resourceService.Create(resource);

                return new OkObjectResult(resourceCreated.ToDTO(resource.Type == ResourceType.ImageUrl));
            }
            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 a resource
        /// </summary>
        /// <param name="updatedResource">Resource to update</param>  
        [ProducesResponseType(typeof(ResourceDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPut]
        public ObjectResult Update([FromBody] ResourceDTO updatedResource)
        {
            try
            {
                if (updatedResource == null)
                    throw new ArgumentNullException("Resource param is null");

                Resource resource = _resourceService.GetById(updatedResource.id);

                if (resource == null)
                    throw new KeyNotFoundException("Resource does not exist");

                // Todo add some verification ? 
                resource.InstanceId = updatedResource.instanceId;
                resource.Label = updatedResource.label;
                resource.Type = updatedResource.type;
                resource.Data = updatedResource.data;

                Resource resourceModified = _resourceService.Update(updatedResource.id, resource);

                return new OkObjectResult(resourceModified.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 a resource
        /// </summary>
        /// <param name="id">Id of resource 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("Resource param is null");

                var ressource = _resourceService.GetById(id);
                if (ressource == null)
                    throw new KeyNotFoundException("Resource does not exist");


                foreach (var configuration in _configurationService.GetAll(ressource.InstanceId))
                {
                    if (configuration.ImageId == id)
                    {
                        configuration.ImageId = null;
                        configuration.ImageSource = null;
                    }
                }


                // Delete all resource occurence
                foreach (var section in _sectionService.GetAll(ressource.InstanceId))
                {
                    if (section.ImageId == id)
                    {
                        section.ImageId = null;
                        section.ImageSource = null;
                    }

                    switch (section.Type)
                    {
                        case SectionType.Map:
                            MapDTO mapDTO = JsonConvert.DeserializeObject<MapDTO>(section.Data);
                            mapDTO.iconResourceId = mapDTO.iconResourceId == id ? null : mapDTO.iconResourceId;
                            foreach (var point in mapDTO.points)
                            {
                                foreach (var image in point.images)
                                {
                                    image.imageSource = image.imageResourceId == id ? null : image.imageSource;
                                    image.imageResourceId = image.imageResourceId == id ? null : image.imageResourceId;
                                }
                            }
                            section.Data = JsonConvert.SerializeObject(mapDTO);
                            break;
                        case SectionType.Slider:
                            SliderDTO sliderDTO = JsonConvert.DeserializeObject<SliderDTO>(section.Data);
                            List<ImageDTO> imagesToKeep = new List<ImageDTO>();
                            foreach (var image in sliderDTO.images)
                            {
                                if (image.resourceId != id)
                                    imagesToKeep.Add(image);
                            }
                            sliderDTO.images = imagesToKeep;
                            section.Data = JsonConvert.SerializeObject(sliderDTO);
                            break;
                        case SectionType.Quizz:
                            QuizzDTO quizzDTO = JsonConvert.DeserializeObject<QuizzDTO>(section.Data);
                            foreach (var question in quizzDTO.questions)
                            {
                                question.source = question.resourceId == id ? null : question.source;
                                question.resourceId = question.resourceId == id ? null : question.resourceId;
                            }
                            if (quizzDTO.bad_level != null) {
                                quizzDTO.bad_level.source = quizzDTO.bad_level.resourceId == id ? null : quizzDTO.bad_level.source;
                                quizzDTO.bad_level.resourceId = quizzDTO.bad_level.resourceId == id ? null : quizzDTO.bad_level.resourceId;
                            }
                            if (quizzDTO.medium_level != null)
                            {
                                quizzDTO.medium_level.source = quizzDTO.medium_level.resourceId == id ? null : quizzDTO.medium_level.source;
                                quizzDTO.medium_level.resourceId = quizzDTO.medium_level.resourceId == id ? null : quizzDTO.medium_level.resourceId;
                            }
                            if (quizzDTO.good_level != null)
                            {
                                quizzDTO.good_level.source = quizzDTO.good_level.resourceId == id ? null : quizzDTO.good_level.source;
                                quizzDTO.good_level.resourceId = quizzDTO.good_level.resourceId == id ? null : quizzDTO.good_level.resourceId;
                            }
                            if (quizzDTO.great_level != null)
                            {
                                quizzDTO.great_level.source = quizzDTO.great_level.resourceId == id ? null : quizzDTO.great_level.source;
                                quizzDTO.great_level.resourceId = quizzDTO.great_level.resourceId == id ? null : quizzDTO.great_level.resourceId;
                            }
                            section.Data = JsonConvert.SerializeObject(quizzDTO);
                            break;
                        case SectionType.Article:
                            ArticleDTO articleDTO = JsonConvert.DeserializeObject<ArticleDTO>(section.Data);
                            List<ImageDTO> imagesArticleToKeep = new List<ImageDTO>();
                            foreach (var image in articleDTO.images)
                            {
                                if (image.resourceId != id)
                                    imagesArticleToKeep.Add(image);
                            }
                            articleDTO.images = imagesArticleToKeep;
                            section.Data = JsonConvert.SerializeObject(articleDTO);
                            break;
                    }

                    _sectionService.Update(section.Id, section);
                }

                _resourceService.Remove(id);

                return new ObjectResult("The resource 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 };
            }
        }
    }
}