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

namespace BlueWest.WebApi.Controllers
{
    /// <summary>
    /// The controller responsible to fetch currency data
    /// </summary>
    [ApiController]
    [Route("[controller]")]
    public class CurrencyController : ControllerBase
    {
        private readonly CountryDbContext _dbContext;
        

        public CurrencyController(CountryDbContext dbContext)
        {
            _dbContext = dbContext;
        }

        /// <summary>
        /// Gets the currency data from currency table
        /// </summary>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        [HttpGet]
        public ActionResult GetCurrencies()
        {
            var dbContext = _dbContext.Currencies;
            
            if (dbContext != null)
            {
                return Ok(dbContext.ToArray());
            }
            
            return new NotFoundResult();
        }

        /// <summary>
        /// Add Currency to the table of currencies
        /// </summary>
        /// <param name="currencyToCreate">Currency data to create</param>
        /// <param name="currencyAssociatedCountries">Countries</param>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status201Created)]
        [HttpPost]
        public ActionResult AddCurrency(CurrencyCreate currencyToCreate)
        {
            
            var newCurrency = currencyToCreate.ToCurrency();
            _dbContext.Currencies.Add(newCurrency);
            _dbContext.SaveChanges();
            return CreatedAtRoute(nameof(GetCurrencyById), new {CurrencyId = newCurrency.Code}, newCurrency);
        }

        /// <summary>
        /// Update a currency data from the Currency table in the database
        /// </summary>
        /// <param name="currencyNumber">The currency number we want to update</param>
        /// <param name="currencyToUpdate">Currency Data to update</param>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status400BadRequest)]
        [HttpPut("{currencyNumber}")]
        public ActionResult UpdateCurrency(int currencyNumber, CurrencyUpdate currencyToUpdate)
        {
            var currency = _dbContext.Currencies.FirstOrDefault(x => x.Num == currencyNumber);

            if (currency != null)
            {
                var updatedCurrency = new Currency(currencyToUpdate, currencyNumber, new List<Country>());
                _dbContext.Update(updatedCurrency);
                _dbContext.SaveChanges();
                return Ok(updatedCurrency);
            }

            return new NotFoundResult();
        }


        /// <summary>
        ///  Gets a currency by the currency number (id)
        /// </summary>
        /// <param name="currencyId">The id of the currency to get</param>
        /// <returns></returns>
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        [HttpGet("{currencyId}", Name = nameof(GetCurrencyById))]
        public ActionResult GetCurrencyById(int currencyId)
        {
            var array = _dbContext.Countries.FirstOrDefault(x => x.Code == currencyId);

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

            return new NotFoundResult();
        }
    }
}