using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using xCommons.Attributes;
using xCommons.Extensions;
using xExceptions.Constants;
using xIdentityHelper;
using xIdentityModels.Constants;
using xIdentityModels.Dtos;
using xIdentityModels.Navigations;
using xModels.Dtos;
using static IdentityServer4.IdentityServerConstants;

namespace xIds.Controllers
{
    public partial class AccountController
    {
        //
        #region Friendship Actions ...
        //
        #region Actions ...
        /// <summary>
        /// Follow a User
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipFollowing</see></returns>
        [RequireXPowered]
        [HttpPost("Friendship/{destUser}/Follow")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<XFriendshipFollowing>> Follow(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .Follow(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Cancel Following
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>a boolean value</returns>
        [HttpPost("Friendship/{destUser}/Cancel")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<bool>> Cancel(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .Cancel(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result);
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Unfollow a Follower
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns></returns>
        [HttpPost("Friendship/{destUser}/UnFollowFollower")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult> UnFollowFollower(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                await IdentityManager
                    .UnFollowFollower(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok();
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Unfollow Following
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns></returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpPost("Friendship/{destUser}/UnFollowFollowing")]
        public async Task<ActionResult> UnFollowFollowing(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                await IdentityManager
                    .UnFollowFollowing(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok();
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Block a Follower
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipFollowing</see></returns>
        [HttpPost("Friendship/{destUser}/Block")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<XFriendshipFollowing>> Block(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .Block(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);

                //
                return exResult;
            }
        }

        /// <summary>
        /// Unblock a Blocked User
        /// </summary>
        /// <param name="destUser">an instance of <see>XFriendshipFollowing</see></param>
        /// <returns>an instance of <see>XFriendshipFollowing</see></returns>
        [HttpPost("Friendship/{destUser}/UnBlock")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<XFriendshipFollowing>> UnBlock(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .UnBlock(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }
        #endregion

        //
        #region Request Handlers ...
        /// <summary>
        /// Accept a Following Request 
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipFollower</see></returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpPost("Friendship/{destUser}/AcceptRequest")]
        public async Task<ActionResult<XFriendshipFollower>> AcceptRequest(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .AcceptRequest(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Reject a Following Request
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipFollower</see></returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpPost("Friendship/{destUser}/RejectRequest")]
        public async Task<ActionResult<XFriendshipFollower>> RejectRequest(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .RejectRequest(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }
        #endregion

        //
        #region Getters ...
        /// <summary>
        /// Check a User IsFollower of Requested User 
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>a boolean value</returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpGet("Friendship/{destUser}/IsFollower")]
        public async Task<ActionResult<bool>> IsFollower(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .IsFollower(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result);
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get Follower State of a User
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipState</see></returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpGet("Friendship/{destUser}/FollowerState")]
        public async Task<ActionResult<XFriendshipState>> FollowerState(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .GetFollowerState(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result);
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get Specific Follower 
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipFollower</see></returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpGet("Friendship/{destUser}/Follower")]
        public async Task<ActionResult<XFriendshipFollower>> Follower(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .GetFollower(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get Followers List Of Current User 
        /// </summary>
        /// <returns>a collection of <see>XFriendshipFollower</see></returns>
        [HttpGet("Friendship/Followers")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<IEnumerable<XFriendshipFollower>>> Followers()
        {
            //
            // Do Action ...
            try
            {
                //
                var result = await IdentityManager
                    .GetFollowers(User.Identity.Name);

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);

                //
                return exResult;
            }
        }

        /// <summary>
        /// Get All Followers List Includes Blocked, Requested and etc 
        /// of Current User
        /// </summary>
        /// <returns>a collection of <see>XFriendshipFollower</see></returns>
        [HttpGet("Friendship/AllFollowers")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<IEnumerable<XFriendshipFollower>>> AllFollowers()
        {
            //
            // Do Action ...
            try
            {
                //
                var result = await IdentityManager
                    .GetAllFollowers(User.Identity.Name);

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get All Followers List Includes Blocked, Requested and etc 
        /// of Current User based On Query Model ...
        /// </summary>
        /// <returns>a Query Result of <see>XFriendDto</see></returns>
        [HttpGet("Friendship/QueryFollowers")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<XQueryResult<XFriendDto>>> QueryFollowers(
            [FromQuery] XQuery query,
            [FromQuery] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Normalizing Dest User ...
                var userInfo = await GetUserInfo();
                bool isAdmin = userInfo.Roles.Contains(XUserRoles.ADMIN);
                if (destUser.IsNullOrEmpty())
                {
                    destUser = userInfo.UserName;
                }
                bool isDestUserValid = isAdmin || destUser == userInfo.UserId || destUser == userInfo.Email || destUser == userInfo.PhoneNumber || destUser == userInfo.UserName;
                if (!isDestUserValid)
                {
                    XException.NotAllowed.Throw();
                }

                //                
                var result = await IdentityManager
                    .QueryFollowers(
                        query: query,
                        userSelectByParam: destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Check a User is in Followings of Current User
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>a boolean value</returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpGet("Friendship/{destUser}/IsFollowing")]
        public async Task<ActionResult<bool>> IsFollowing(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .IsFollowing(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result);
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get Following State Relation between Specific User 
        /// and Current User
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipState</see></returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpGet("Friendship/{destUser}/FollowingState")]
        public async Task<ActionResult<XFriendshipState>> FollowingState(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .GetFollowingState(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result);
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get Specific Following Model
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipFollowing</see></returns>
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        [HttpGet("Friendship/{destUser}/Following")]
        public async Task<ActionResult<XFriendshipFollowing>> Following(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Validate Args ...
                ValidationProvider.NotEmpty(destUser);

                //
                var result = await IdentityManager
                    .GetFollowing(
                        User.Identity.Name,
                        destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get Followings of Current User
        /// </summary>
        /// <returns>a collection of <see>XFriendshipFollowing</see></returns>
        [HttpGet("Friendship/Followings")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<IEnumerable<XFriendshipFollowing>>> Followings()
        {
            //
            // Do Action ...
            try
            {
                //
                var result = await IdentityManager
                    .GetFollowings(User.Identity.Name);

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get All Following List Includes Blocked, Requested and etc 
        /// of Current User
        /// </summary>
        /// <returns>a collection of <see>XFriendshipFollowing</see></returns>
        [HttpGet("Friendship/AllFollowings")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<IEnumerable<XFriendshipFollowing>>> AllFollowings()
        {
            //
            // Do Action ...
            try
            {
                //
                var result = await IdentityManager
                    .GetAllFollowings(User.Identity.Name);

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get All Following List Includes Blocked, Requested and etc 
        /// of Current User based On Query Model ...
        /// </summary>
        /// <returns>a Query Result of <see>XFriendDto</see></returns>
        [HttpGet("Friendship/QueryFollowings")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<XQueryResult<XFriendDto>>> QueryFollowings(
            [FromQuery] XQuery query,
            [FromQuery] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                // Normalizing Dest User ...
                var userInfo = await GetUserInfo();
                bool isAdmin = userInfo.Roles.Contains(XUserRoles.ADMIN);
                if (destUser.IsNullOrEmpty())
                {
                    destUser = userInfo.UserName;
                }
                bool isDestUserValid = isAdmin || destUser == userInfo.UserId || destUser == userInfo.Email || destUser == userInfo.PhoneNumber || destUser == userInfo.UserName;
                if (!isDestUserValid)
                {
                    XException.NotAllowed.Throw();
                }

                //                
                var result = await IdentityManager
                    .QueryFollowings(
                        query: query,
                        userSelectByParam: destUser
                    );

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }
        #endregion

        //
        #region Others ...
        /// <summary>
        /// Return Following UserName's List of Current User 
        /// </summary>
        /// <returns>a collection of UserNames</returns>
        [HttpGet("Friendship/FollowingsList")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<IEnumerable<string>>> FollowingsList()
        {
            //
            // Do Action ...
            try
            {
                //
                var result = await IdentityManager
                    .GetFollowingList(User.Identity.Name);

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Return Followers UserName's List of Current User 
        /// </summary>
        /// <returns>a collection of UserNames</returns>
        [HttpGet("Friendship/FollowersList")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<IEnumerable<string>>> FollowersList()
        {
            //
            // Do Action ...
            try
            {
                //
                var result = await IdentityManager
                    .GetFollowersList(User.Identity.Name);

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }

        /// <summary>
        /// Get Friendship Info Model between Specific User and Current User
        /// </summary>
        /// <param name="destUser">a user identifier which represent destination user</param>
        /// <returns>an instance of <see>XFriendshipInfoDto</see></returns>
        [HttpGet("Friendship/{destUser}/FriendshipInfo")]
        [Authorize(Policy = LocalApi.PolicyName)]
        [Authorize(Policy = XPolicies.EnabledUser)]
        public async Task<ActionResult<XFriendshipInfoDto>> FriendshipInfo(
            [FromRoute] string destUser
        )
        {
            //
            // Do Action ...
            try
            {
                //
                var result = await IdentityManager
                    .GetFriendshipInfo(User.Identity.Name, destUser);

                //
                return Ok(result
                    .ToDynamicObject());
            }
            catch (Exception ex)
            {
                //
                var exResult = GetExceptionActionResult(ex);
                return exResult;
            }
        }
        #endregion
        #endregion        
    }
}