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

namespace ManagerService.Controllers
{
    /// <summary>
    /// Les points d'intérêt d'une <b>maquette 3D</b> — item E7 du lot XR-4.
    ///
    /// <b>Pourquoi un contrôleur à part.</b> Le CRUD des points existe déjà, mais il est
    /// écrit sur <c>SectionMap</c> : <c>OfType&lt;SectionMap&gt;()</c>, <c>MapPoints</c>.
    /// Une maquette a les mêmes points — c'est le même <c>GeoPoint</c> — sur une autre
    /// collection. Élargir <c>SectionMapController</c> aurait mélangé deux types de
    /// section dans chaque méthode ; ce contrôleur-ci ne parle que de maquettes.
    ///
    /// La différence de fond tient en un champ : ici un point porte une
    /// <c>LocalTransform</c> (x, y, z dans le repère du modèle) là où une carte porte
    /// une géométrie PostGIS. Les deux coexistent sur l'entité, et rien n'oblige un point
    /// à n'en avoir qu'une.
    /// </summary>
    [Authorize(Policy = ManagerService.Service.Security.Policies.ContentEditor)]
    [ApiController, Route("api/[controller]")]
    [OpenApiTag("SectionScene3D", Description = "3D model section points of interest")]
    public class SectionScene3DController : ControllerBase
    {
        private readonly ILogger<SectionScene3DController> _logger;
        private readonly MyInfoMateDbContext _myInfoMateDbContext;

        public SectionScene3DController(ILogger<SectionScene3DController> logger,
                                        MyInfoMateDbContext myInfoMateDbContext)
        {
            _logger = logger;
            _myInfoMateDbContext = myInfoMateDbContext;
        }

        /// <summary>Get all points of interest of a 3D model section</summary>
        /// <param name="sectionId">Section id</param>
        [AllowAnonymous]
        [RequireAppKey]
        [ProducesResponseType(typeof(List<GeoPointDTO>), 200)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpGet("{sectionId}/points")]
        public ObjectResult GetAllPointsFromSection(string sectionId)
        {
            try
            {
                var section = _myInfoMateDbContext.Sections
                    .OfType<SectionScene3D>()
                    .Include(s => s.Points)
                    .FirstOrDefault(s => s.Id == sectionId);

                if (section == null)
                    throw new KeyNotFoundException("3D model section does not exist");

                return new OkObjectResult(
                    (section.Points ?? new List<GeoPoint>()).Select(p => p.ToDTO()).ToList());
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>Add a point of interest to a 3D model section</summary>
        /// <param name="sectionId">Section id</param>
        /// <param name="geoPointDTO">Point to create</param>
        [ProducesResponseType(typeof(GeoPointDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPost("{sectionId}/points")]
        public ObjectResult CreatePoint(string sectionId, [FromBody] GeoPointDTO geoPointDTO)
        {
            try
            {
                if (geoPointDTO == null)
                    throw new ArgumentNullException("GeoPoint is null");

                var section = _myInfoMateDbContext.Sections
                    .OfType<SectionScene3D>()
                    .Include(s => s.Points)
                    .FirstOrDefault(s => s.Id == sectionId);

                if (section == null)
                    throw new KeyNotFoundException("3D model section does not exist");

                var point = new GeoPoint
                {
                    Title = geoPointDTO.title,
                    Description = geoPointDTO.description,
                    Contents = geoPointDTO.contents,
                    ImageResourceId = geoPointDTO.imageResourceId,
                    ImageUrl = geoPointDTO.imageUrl,
                    Schedules = geoPointDTO.schedules,
                    Prices = geoPointDTO.prices,
                    Phone = geoPointDTO.phone,
                    Email = geoPointDTO.email,
                    Site = geoPointDTO.site,

                    // Un point neuf n'a pas encore été posé sur la maquette : il arrive à
                    // l'origine du modèle, là où l'éditeur le montrera pour qu'on le place.
                    LocalTransform = geoPointDTO.localTransform ?? new Position3D()
                };

                section.Points ??= new List<GeoPoint>();
                section.Points.Add(point);

                _myInfoMateDbContext.SaveChanges();

                return new OkObjectResult(point.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>Update a point of interest, position included</summary>
        /// <param name="geoPointDTO">Point to update</param>
        [ProducesResponseType(typeof(GeoPointDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPut("points")]
        public ObjectResult UpdatePoint([FromBody] GeoPointDTO geoPointDTO)
        {
            try
            {
                if (geoPointDTO == null)
                    throw new ArgumentNullException("GeoPoint param is null");

                var point = _myInfoMateDbContext.GeoPoints
                    .FirstOrDefault(p => p.Id == geoPointDTO.id);

                if (point == null)
                    throw new KeyNotFoundException("GeoPoint does not exist");

                point.Title = geoPointDTO.title ?? point.Title;
                point.Description = geoPointDTO.description ?? point.Description;
                point.Contents = geoPointDTO.contents ?? point.Contents;
                point.ImageResourceId = geoPointDTO.imageResourceId ?? point.ImageResourceId;
                point.ImageUrl = geoPointDTO.imageUrl ?? point.ImageUrl;

                // C'est le champ que l'éditeur 3D renvoie à chaque déplacement, et la
                // seule raison pour laquelle cette route est appelée souvent.
                if (geoPointDTO.localTransform != null)
                    point.LocalTransform = geoPointDTO.localTransform;

                _myInfoMateDbContext.SaveChanges();

                return new OkObjectResult(point.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 point of interest</summary>
        /// <param name="id">Point id</param>
        [ProducesResponseType(typeof(string), 200)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpDelete("points/{id}")]
        public ObjectResult DeletePoint(int id)
        {
            try
            {
                var point = _myInfoMateDbContext.GeoPoints.FirstOrDefault(p => p.Id == id);

                if (point == null)
                    throw new KeyNotFoundException("GeoPoint does not exist");

                _myInfoMateDbContext.GeoPoints.Remove(point);
                _myInfoMateDbContext.SaveChanges();

                return new OkObjectResult("Point deleted");
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }
    }
}