using System.Collections.Generic;
using System.Linq;
using BlueWest.Data;
using BlueWest.WebApi.MySQL;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace BlueWest.WebApi.Controllers
{
    /// <summary>
    /// Controller responsible to get country data
    /// </summary>
    [ApiController]
    [Route("[controller]")]
    public class CountryController : ControllerBase
    {
        private readonly CountryDbContext _dbContext;

        /// <summary>
        /// Controller responsible for handling country data in the Country table
        /// </summary>
        /// <param name="dbContext"></param>
        public CountryController(CountryDbContext dbContext)
        {
            _dbContext = dbContext;
        }


        /// <summary>
        /// Add Country
        /// </summary>
        /// <param name="countryToCreate">The country data to create</param>
        /// <returns>The newly created country</returns>
        /// /// <summary>
        /// Creates a Country.
        /// </summary>
        /// <remarks>
        /// Sample request:
        ///
        ///     POST /Countries
        ///     {
        ///        "code": 1,
        ///        "stateName": "United States of America",
        ///        "tld": "us"
        ///     }
        ///
        /// </remarks>
        /// <response code="201">Returns the newly created country</response>
        [ProducesResponseType(StatusCodes.Status201Created)]
        [HttpPost]
        public ActionResult AddCountry(CountryCreate countryToCreate)
        {
            var newCountry = countryToCreate.ToCountry();
            _dbContext.Countries.Add(newCountry);
            _dbContext.SaveChanges();
            return CreatedAtRoute(nameof(GetCountryById), new {countryId = newCountry.Code}, newCountry);
        }

        /// <summary>
        /// Updates a Country
        /// </summary>
        /// <param name="countryCode">The country ISO 3166 code</param>
        /// <param name="countryToUpdate">Country payload data</param>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status400BadRequest)]
        [HttpPut("{countryCode}")]
        public ActionResult UpdateCountry(int countryCode, CountryUpdate countryToUpdate)
        {
            var country = _dbContext.Countries.FirstOrDefault(x => x.Code == countryCode);

            if (country != null)
            {
                var updatedCountry = new Country(countryToUpdate, countryCode, country.Currencies, country.Users);
                _dbContext.Countries.Update(updatedCountry);
                return Ok(updatedCountry);
            }

            return new NotFoundResult();
        }


        /// <summary>
        /// Get countries
        /// </summary>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        [HttpGet]
        public ActionResult GetCountries()
        {
            var array = _dbContext.Countries;

            if (array != null)
            {
                return Ok(array.ToArray());
            }

            return new NotFoundResult();
        }

        /// <summary>
        /// Get Country by Id
        /// </summary>
        /// <param name="countryId">ISO 3166-1 country numeric code</param>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        [HttpGet("{countryId}", Name = nameof(GetCountryById))]
        public ActionResult GetCountryById(int countryId)
        {
            var array = _dbContext.Countries.FirstOrDefault(x => x.Code == countryId);

            if (array != null)
            {
                return Ok(array);
            }

            return new NotFoundResult();
        }

        /// <summary>
        /// Get currencies of a country
        /// </summary>
        /// <param name="countryId"></param>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        [HttpGet("{countryId}/currencies")]
        public ActionResult GetCountryCurrencies(int countryId)
        {
            var country = _dbContext.Countries.FirstOrDefault(d => d.Code == countryId);

            if (country == null) return new NotFoundResult();

            var array = _dbContext
                .Countries
                .Where(data => data.Code == countryId)
                .SelectMany(o => o.Currencies)
                .ToArray();

            return Ok(array);
        }
    }
}