using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using MrHuo.OAuth.Github;
using MrHuo.OAuth.Microsoft;
using System.IdentityModel.Tokens.Jwt;
using System.Management;
using System.Security.Claims;
using System.Text;

namespace asg_form.Controllers
{


    [ApiController]
    public class OAuthController : Controller
    {
       
        private readonly RoleManager<Role> roleManager;
        private readonly UserManager<User> userManager;

        public OAuthController(
            RoleManager<Role> roleManager, UserManager<User> userManager)
        {

            this.roleManager = roleManager;
            this.userManager = userManager;
        }




        [HttpGet("oauth/setpassword")]
        public async Task<object> SetPasswordAsync(string username,string password, [FromServices] IOptions<JWTOptions> jwtOptions)
        {
            var user = await userManager.FindByNameAsync(username);
            await userManager.AddPasswordAsync(user, password);
            var claims = new List<Claim>();
            claims.Add(new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()));
            claims.Add(new Claim(ClaimTypes.Name, user.UserName));
            var roles = await userManager.GetRolesAsync(user);
            foreach (string role in roles)
            {
                claims.Add(new Claim(ClaimTypes.Role, role));
            }
            string jwtToken = BuildToken(claims, jwtOptions.Value);
            return jwtToken;
        }


        [HttpGet("oauth/{type}")]
        public IActionResult Index(
            string type,string recall,
            [FromServices] GithubOAuth githubOAuth,
            [FromServices] MicrosoftOAuth microsoftOAuth
        )
        {
            var redirectUrl = "";
            switch (type.ToLower())
            {
                case "github":
                    {
                        redirectUrl = githubOAuth.GetAuthorizeUrl();
                        break;
                    }
                case "microsoft":
                    {
                       redirectUrl = microsoftOAuth.GetAuthorizeUrl();
                        break;
                    }
                default:
                    return NotFound($"没有实现【{type}】登录方式！");
            }
            return Redirect(redirectUrl);
        }


        private static string BuildToken(IEnumerable<Claim> claims, JWTOptions options)
        {
            DateTime expires = DateTime.Now.AddSeconds(options.ExpireSeconds);
            byte[] keyBytes = Encoding.UTF8.GetBytes(options.SigningKey);
            var secKey = new SymmetricSecurityKey(keyBytes);

            var credentials = new SigningCredentials(secKey,
                SecurityAlgorithms.HmacSha256Signature);
            var tokenDescriptor = new JwtSecurityToken(expires: expires,
                signingCredentials: credentials, claims: claims);
            return new JwtSecurityTokenHandler().WriteToken(tokenDescriptor);
        }

        [HttpGet("oauth/{type}callback")]
        public async Task<IActionResult> LoginCallback(
            string type,
            [FromServices] GithubOAuth githubOAuth,
            [FromServices] MicrosoftOAuth microsoftOAuth,
            [FromServices] IOptions<JWTOptions> jwtOptions,
            [FromQuery] string code,
            [FromQuery] string state)
        {
            try
            {
                switch (type.ToLower())
                {
                    case "github":
                        {
                            var authorizeResult = await githubOAuth.AuthorizeCallback(code, state);
                            if (!authorizeResult.IsSccess)
                            {
                                throw new Exception(authorizeResult.ErrorMessage);
                            }
                            var userinfo = await githubOAuth.GetUserInfoAsync(authorizeResult.AccessToken);
                            //如果该Gitgub用户不存在，则创建一个
                            var user = new User() { Id=20,UserName = $"gh{userinfo.Name}", Email = userinfo.Email };
                            if (user == null)
                            {
                                var user_new = await userManager.FindByNameAsync(userinfo.Name);
                                var r = await userManager.CreateAsync(user);
                                return Redirect($"https://commentary.idvasg.cn/oauth/next?username=gh{userinfo.Name}");
                            }
                            var claims = new List<Claim>();
                            claims.Add(new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()));
                            claims.Add(new Claim(ClaimTypes.Name, user.UserName));
                            var roles = await userManager.GetRolesAsync(user);
                            foreach (string role in roles)
                            {
                               claims.Add(new Claim(ClaimTypes.Role, role));
                            }
                            string jwtToken = BuildToken(claims, jwtOptions.Value);
                            return Redirect($"https://commentary.idvasg.cn/oauth/loginok?token={jwtToken}");
                            break;
                        }
                        case "microsoft":
                        {
                            var authorizeResult = await microsoftOAuth.AuthorizeCallback(code, state);
                            if (!authorizeResult.IsSccess)
                            {
                                throw new Exception(authorizeResult.ErrorMessage);
                            }
                            var userinfo = await githubOAuth.GetUserInfoAsync(authorizeResult.AccessToken);
                            var user = new User() { Id = 20, UserName = $"ms{userinfo.Name}", Email = userinfo.Email };
                            if (user == null)
                            {
                                var user_new = await userManager.FindByNameAsync(userinfo.Name);
                                var r = await userManager.CreateAsync(user);
                                return Redirect($"https://commentary.idvasg.cn/oauth/next?username=gh{userinfo.Name}");
                            }
                            var claims = new List<Claim>();
                            claims.Add(new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()));
                            claims.Add(new Claim(ClaimTypes.Name, user.UserName));
                            var roles = await userManager.GetRolesAsync(user);
                            foreach (string role in roles)
                            {
                                claims.Add(new Claim(ClaimTypes.Role, role));
                            }
                            string jwtToken = BuildToken(claims, jwtOptions.Value);
                            return Redirect($"https://commentary.idvasg.cn/oauth/loginok?token={jwtToken}");

                            break;
                        }
                    default:
                        throw new Exception($"没有实现【{type}】登录回调！");
                }
            }
            catch (Exception ex)
            {
                return Content(ex.Message);
            }
        }
    }
}