using AutoMapper;
using DamageAssesment.Api.UsersAccess.Db;
using DamageAssesment.Api.UsersAccess.Interfaces;
using DamageAssesment.Api.UsersAccess.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using System.Data;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;

namespace DamageAssesment.Api.UsersAccess.Providers
{
    public class UsersAccessProvider : IUsersAccessProvider
    {
        private readonly UsersAccessDbContext userAccessDbContext;
        private readonly ILogger<UsersAccessProvider> logger;
        private readonly IMapper mapper;
        //private readonly IEmployeeServiceProvider employeeServiceProvider;
        private readonly JwtSettings jwtSettings;
        private readonly ITokenServiceProvider tokenServiceProvider;

        public UsersAccessProvider(IOptions<JwtSettings> options, ITokenServiceProvider tokenServiceProvider, UsersAccessDbContext userAccessDbContext, IEmployeeServiceProvider employeeServiceProvider, ILogger<UsersAccessProvider> logger, IMapper mapper)
        {
            this.userAccessDbContext = userAccessDbContext;
            //this.employeeServiceProvider = employeeServiceProvider;
            this.logger = logger;
            this.mapper = mapper;
            jwtSettings = options.Value;
            this.tokenServiceProvider = tokenServiceProvider;
           // seedData();
        }

        public void seedData()
        {
            if (!userAccessDbContext.Users.Any())
            {
                userAccessDbContext.Users.Add(new Db.User { Id = 1, EmployeeId = 1, EmployeeCode = "Emp1", RoleId = 1, IsActive = true, CreateDate = DateTime.Now });
                userAccessDbContext.Users.Add(new Db.User { Id = 2, EmployeeId = 2, EmployeeCode = "Emp2", RoleId = 2, IsActive = true, CreateDate = DateTime.Now });
                userAccessDbContext.Users.Add(new Db.User { Id = 3, EmployeeId = 3, EmployeeCode = "Emp3", RoleId = 3, IsActive = true, CreateDate = DateTime.Now });
                userAccessDbContext.SaveChanges();
            }

            if (!userAccessDbContext.Roles.Any())
            {
                userAccessDbContext.Roles.Add(new Db.Role { Id = 1, Name = "admin", Description ="Administrator role have full access" });
                userAccessDbContext.Roles.Add(new Db.Role { Id = 2, Name = "user", Description =" User role"});
                userAccessDbContext.Roles.Add(new Db.Role { Id = 3, Name = "survey", Description ="Survey role" });
                userAccessDbContext.Roles.Add(new Db.Role { Id = 4, Name = "report", Description ="Report role"});
                userAccessDbContext.Roles.Add(new Db.Role { Id = 5, Name = "document", Description ="Document role" });
                userAccessDbContext.SaveChanges();
            }
        }

        public async Task<(bool IsSuccess, IEnumerable<Models.User> Users, string ErrorMessage)> GetUsersAsync()
        {
            try
            {
                logger?.LogInformation("Gell all Users from DB");
                var users = await userAccessDbContext.Users.ToListAsync();
                if (users != null)
                {
                    logger?.LogInformation($"{users.Count} Items(s) found");
                    var result = mapper.Map<IEnumerable<Db.User>, IEnumerable<Models.User>>(users);
                    return (true, result, null);
                }
                return (false, null, "Not found");
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, Models.User User, string ErrorMessage)> GetUsersAsync(int Id)
        {
            try
            {
                logger?.LogInformation("Querying Users table");
                var user = await userAccessDbContext.Users.SingleOrDefaultAsync(s => s.Id == Id);
                if (user != null)
                {
                    logger?.LogInformation($"User Id: {Id} found");
                    var result = mapper.Map<Db.User, Models.User>(user);
                    return (true, result, null);
                }
                return (false, null, "Not found");
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, Models.User User, string ErrorMessage)> PostUserAsync(Models.User user)
        {
            try
            {
                if (user != null)
                {
                    var _user = mapper.Map<Models.User, Db.User>(user);
                    userAccessDbContext.Users.Add(_user);
                    user.Id = _user.Id;
                    await userAccessDbContext.SaveChangesAsync();
                    return (true, user, "Successful");
                }
                else
                {
                    logger?.LogInformation($"null object cannot be added");
                    return (false, null, $"null object cannot be added");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, Models.User User, string ErrorMessage)> PutUserAsync(int Id, Models.User user)
        {
            try
            {
                if (user != null)
                {
                    var _user = await userAccessDbContext.Users.AsNoTracking().Where(s => s.Id == Id).SingleOrDefaultAsync();

                    if (_user != null)
                    {
                        int count = userAccessDbContext.Users.Where(u => u.Id != user.Id).Count();
                        if (count == 0)
                        {
                            await userAccessDbContext.SaveChangesAsync();
                            logger?.LogInformation($"Employee Id:  {user.EmployeeId} updated successfuly");
                            return (true, mapper.Map<Db.User, Models.User>(_user), $"Employee Id:  {_user.EmployeeId} updated successfuly");
                        }
                        else
                        {
                            logger?.LogInformation($"Employee Id:  {user.EmployeeId} is already exist");
                            return (false, null, $"Employee Id:  {user.EmployeeId} is already exist");
                        }
                    }
                    else
                    {
                        logger?.LogInformation($"User Id : {Id} Not found");
                        return (false, null, "Not Found");
                    }
                }
                else
                {
                    logger?.LogInformation($"User Id: {Id} Bad Request");
                    return (false, null, "Bad request");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, Models.User User, string ErrorMessage)> DeleteUserAsync(int Id)
        {
            try
            {
                var user = await userAccessDbContext.Users.Where(x => x.Id == Id).SingleOrDefaultAsync();

                if (user != null)
                {
                    userAccessDbContext.Users.Remove(user);
                    await userAccessDbContext.SaveChangesAsync();
                    logger?.LogInformation($"User Id: {Id} deleted Successfuly");
                    return (true, mapper.Map<Db.User, Models.User>(user), $"User Id: {Id} deleted Successfuly");
                }
                else
                {
                    logger?.LogInformation($"User Id : {Id} Not found");
                    return (false, null, "Not Found");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, TokenResponse TokenResponse, string ErrorMessage)> AuthenticateAsync(string employecode)
        {
          
            if (employecode != null)
              {
                //implementation for dadeschools authentication
                // var employees = await employeeServiceProvider.getEmployeesAsync();
                // var employee = employees.Where(e=> e.EmployeeCode.ToLower() == employecode.ToLower()).SingleOrDefault();
                var user = userAccessDbContext.Users.Where(x => x.IsActive == true && x.EmployeeCode.ToLower() == employecode.ToLower()).SingleOrDefault();
       
                          if (user != null)
                          {

                              var r = await GetRolesAsync();
                              var role = r.Roles.Where(x => x.Id == user.RoleId).SingleOrDefault();

                              var authClaims = new List<Claim> {
                               new Claim(ClaimTypes.Name, user.EmployeeCode),
                               new Claim(ClaimTypes.Role, role.Name),
                               new Claim(JwtRegisteredClaimNames.Jti,Guid.NewGuid().ToString())

                              };

                              /// Generate Token
                              var tokenhandler = new JwtSecurityTokenHandler();
                              var tokenkey = Encoding.UTF8.GetBytes(jwtSettings.securitykey);
                              var tokendesc = new SecurityTokenDescriptor
                              {
                                  Audience = "",
                                  NotBefore = DateTime.Now,
                                  Subject = new ClaimsIdentity(authClaims),
                                  Expires = DateTime.Now.AddMinutes(30),
                                  SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(tokenkey), SecurityAlgorithms.HmacSha256)
                              };
                              var token = tokenhandler.CreateToken(tokendesc);
                              string finaltoken = tokenhandler.WriteToken(token);

                              var response = new TokenResponse() { jwttoken = finaltoken, refreshtoken = await tokenServiceProvider.GenerateToken(mapper.Map<Db.User,Models.User>(user)) };
                              return (true, response, "Authentication success and token issued.");
                          }
                          else
                          {
                              return (false, null, "user inactive or not exist.");
                          }
                  }

              else
              {
                  return (false, null, "Credentials are required to authenticate.");
              }
        }
        public async Task<(bool IsSuccess, IEnumerable<Models.Role> Roles, string ErrorMessage)> GetRolesAsync()
        {
            try
            {
                logger?.LogInformation("Gell all Roles from DB");
                var roles = await userAccessDbContext.Roles.ToListAsync();
                if (roles != null)
                {
                    logger?.LogInformation($"{roles.Count} Items(s) found");
                    var result = mapper.Map<IEnumerable<Db.Role>, IEnumerable<Models.Role>>(roles);
                    return (true, result, null);
                }
                return (false, null, "Not found");
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, Models.TokenResponse TokenResponse, string ErrorMessage)> RefreshTokenAsync(TokenResponse tokenResponse)
        {
            //Generate token
            var tokenhandler = new JwtSecurityTokenHandler();
            var tokenkey = Encoding.UTF8.GetBytes(this.jwtSettings.securitykey);
            SecurityToken securityToken;
            var principal = tokenhandler.ValidateToken(tokenResponse.jwttoken, new TokenValidationParameters
            {
                ValidateIssuerSigningKey = true,
                IssuerSigningKey = new SymmetricSecurityKey(tokenkey),
                ValidateIssuer = false,
                ValidateAudience = false,

            }, out securityToken);

            var token = securityToken as JwtSecurityToken;
            if (token != null && !token.Header.Alg.Equals(SecurityAlgorithms.HmacSha256))
            {
                return (false, null, "Unauthorized");
            }
            var username = principal.Identity?.Name;

            var tokens = await userAccessDbContext.Tokens.ToListAsync();
            var users = await userAccessDbContext.Users.ToListAsync();

            var user = (from u in users
                        join t in tokens
                        on u.Id equals t.UserId
                        where u.EmployeeId == 1
                        && t.RefreshToken == tokenResponse.refreshtoken
                        select u).FirstOrDefault();

            if (user == null)
                return (false, null, "Invalid Token Response object provided");

            var _user = mapper.Map<Db.User, Models.User>(user);
            var response = tokenServiceProvider.TokenAuthenticate(_user, principal.Claims.ToArray()).Result;
            return (true, response, "Token authenticated and refreshed.");
        }


    }
}