using AutoMapper;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.SelfService.Portal.Core.API.Context;
using Microsoft.SelfService.Portal.Core.API.Dto.ConfigurationValue.Add;
using Microsoft.SelfService.Portal.Core.API.Dto.ConfigurationValue.Get;
using Microsoft.SelfService.Portal.Core.API.JsonDocuments;
using Microsoft.SelfService.Portal.Core.API.Models;

namespace Microsoft.SelfService.Portal.Core.API.Controllers
{
    [Route("api/configuration-values")]
    [ApiController]
    public class ConfigurationValueController : Controller
    {
        private readonly DataContext _context;
        private readonly IMapper _mapper;

        public ConfigurationValueController(DataContext context, IMapper mapper)
        {
            _context = context;
            _mapper = mapper;
        }

        [HttpGet]
        [ProducesResponseType(200, Type = typeof(IEnumerable<GetConfigurationValueDto>))]
        public IActionResult GetConfigurationValues([FromQuery] Guid? definitionId, [FromQuery] string? scopeType, [FromQuery] Guid? scopeId)
        {
            var query = _context.ConfigurationValues
                .AsNoTracking()
                .Include(value => value.ConfigurationDefinition)
                .AsQueryable();

            if (definitionId.HasValue)
                query = query.Where(value => value.ConfigurationDefinitionId == definitionId.Value);

            if (!string.IsNullOrWhiteSpace(scopeType))
                query = query.Where(value => value.ScopeType == scopeType);

            if (scopeId.HasValue)
                query = query.Where(value => value.ScopeId == scopeId.Value);

            var values = query
                .OrderBy(value => value.ScopeType)
                .ThenBy(value => value.SortOrder)
                .ThenBy(value => value.ConfigurationDefinition.Name)
                .ToList();

            return Ok(_mapper.Map<List<GetConfigurationValueDto>>(values));
        }

        [HttpPost]
        [ProducesResponseType(200, Type = typeof(Guid))]
        [ProducesResponseType(400)]
        public IActionResult AddConfigurationValue([FromBody] AddConfigurationValueDto configurationValue)
        {
            if (configurationValue == null)
                return BadRequest(ModelState);

            if (!_context.ConfigurationDefinitions.Any(definition => definition.Id == configurationValue.ConfigurationDefinitionId))
            {
                ModelState.AddModelError(nameof(configurationValue.ConfigurationDefinitionId), "Configuration definition was not found.");
                return BadRequest(ModelState);
            }

            if (!string.IsNullOrWhiteSpace(configurationValue.ValueJson))
            {
                try
                {
                    configurationValue.ValueJson = ConfigurationDocumentValidator.NormalizeAndValidate(
                        configurationValue.ValueJson,
                        ConfigurationDocumentKind.Metadata).JsonData;
                }
                catch (ConfigurationDocumentValidationException ex)
                {
                    ModelState.AddModelError(nameof(configurationValue.ValueJson), ex.Message);
                    return BadRequest(ModelState);
                }
            }

            var model = _mapper.Map<ConfigurationValueModel>(configurationValue);
            model.Id = Guid.NewGuid();
            model.ValueHash = TemplateVersionModel.ComputeSha256(model.ValueJson ?? model.SourcePath ?? string.Empty);

            _context.ConfigurationValues.Add(model);
            _context.SaveChanges();

            return Ok(model.Id);
        }

        [HttpDelete("{id}")]
        [ProducesResponseType(204)]
        [ProducesResponseType(404)]
        public IActionResult DeleteConfigurationValue(Guid id)
        {
            var value = _context.ConfigurationValues.FirstOrDefault(existing => existing.Id == id);
            if (value == null)
                return NotFound();

            _context.ConfigurationValues.Remove(value);
            _context.SaveChanges();

            return NoContent();
        }
    }
}