using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;

using Dapper;

using Fab2ApprovalSystem.Misc;
using Fab2ApprovalSystem.Models;

namespace Fab2ApprovalSystem.DMO;

public class AdminDMO {
    private readonly IDbConnection db = new SqlConnection(GlobalVars.DB_CONNECTION_STRING);
#if !NET8
    private static FabApprovalTrainingEntities FabApprovalDB = new FabApprovalTrainingEntities();
#endif

    public List<ParentChildModel> GetAllSubRoles(string showInactiveRoles = "") {
        List<ParentChildModel> results = new();

        List<Role> roles = GetSubRoles();

        ParentChildModel child;
        ParentChildModel parent;

        foreach (Role r in roles) {
            parent = new ParentChildModel {
                id = r.RoleID,
                parentid = -1,
                text = r.RoleName,
                value = r.RoleID.ToString()
            };

            foreach (SubRole sr in r.SubRoles) {
                if (sr.Inactive) {
                    // hide inactive roles unless parameter says otherwise
                    if (!showInactiveRoles.Equals("true"))
                        continue;
                }

                child = new ParentChildModel {
                    id = sr.SubRoleID,
                    parentid = r.RoleID,
                    text = sr.SubRoleCategoryItem + (sr.Inactive ? " (Inactive)" : ""),
                    value = sr.SubRoleID.ToString()
                };
                results.Add(child);
            }

            results.Add(parent);
        };
        return results;
    }

    public List<Role> GetSubRoles() {
        StringBuilder sql = new();
        sql.Append(
            "SELECT  R.RoleID, R.RoleName, SubRoleID, SubRoleCategoryItem, SR.RoleID, SR.Inactive " +
            "FROM vSubRoles SR " +
            "INNER JOIN Role R ON R.RoleID =  SR.RoleID " +
            "ORDER BY R.RoleID, SubRoleCategoryItem ");

        db.Open();
        Dictionary<int, Role> lookup = new();
        List<Role> data = db.Query<Role, SubRole, Role>(sql.ToString(),
                (parent, child) => {
                    Role role;
                    if (!lookup.TryGetValue(parent.RoleID, out role)) {
                        lookup.Add(parent.RoleID, role = parent);
                    }
                    role.SubRoles.Add(child);
                    return role;
                },
                splitOn: "SubRoleID").Distinct().ToList();

        return data;
    }

    public List<UserSubRoles> GetUserSubRoles(int userId) {
        DynamicParameters parameters = new();
        parameters.Add("@UserId", userId);
        List<UserSubRoles> userSubRoleList = db.Query<UserSubRoles>("GetSubRolesByUserId", parameters, commandType: CommandType.StoredProcedure).ToList();
        return userSubRoleList;
    }

    public IEnumerable<LoginModel> GetAllUsersBySubRole(int subRole) {
        StringBuilder sql = new();
        sql.Append("SELECT FirstName + ' ' + LastName AS FullName , LoginID, FirstName, LastName, U.UserID,  SubRoleID ");
        sql.Append("FROM UserSubRole UR ");
        sql.Append("INNER JOIN Users U ON  UR.UserID = U.UserID ");
        sql.Append("WHERE UR.SubRoleID = " + subRole.ToString() + " ");
        sql.Append("ORDER BY FirstName");

        return db.Query<LoginModel>(sql.ToString()).ToList();
    }

    public void AddUserRoles(int subRole, string userids) {
        string sql;

        string[] arrayOfUsers = userids.Split(new char[] { '~' });

        for (int i = 0; i < arrayOfUsers.Length; i++) {
            sql = "INSERT INTO UserSubRole (UserID, SubRoleID) VALUES (" + arrayOfUsers[i] + ", " + subRole + " )";
            db.Execute(sql);
        }

    }

    public void DeleteUserFromAllTrainingGroups(int userId) {
        string sql = "DELETE FROM TrainingGroupMembers WHERE UserId = " + userId;

        db.Open();
        db.Execute(sql);
        return;
    }

    public void DeleteUserRoles(int subRole, string userids) {
        string sql;

        string[] arrayOfUsers = userids.Split(new char[] { '~' });

        for (int i = 0; i < arrayOfUsers.Length; i++) {
            sql = "DELETE FROM UserSubRole WHERE UserID = " + arrayOfUsers[i] + " AND SubRoleID = " + subRole;
            db.Execute(sql);
        }

    }

#if !NET8

    public List<TrainingReportUser> GetTrainingReportUsers() {
        List<TrainingReportUser> CurrentReportUsers = (from a in FabApprovalDB.TrainingReportUsers select a).ToList();
        return CurrentReportUsers;
    }

#endif

#if NET8

    public List<TrainingReportUser> GetTrainingReportUsers() =>
        throw new NotImplementedException();

#endif

#if !NET8
    public List<TECNNotificationsUser> GetTECNNotificationUsers() {
        List<TECNNotificationsUser> currentTECNNotificationUsers = (from a in FabApprovalDB.TECNNotificationsUsers select a).ToList();
        return currentTECNNotificationUsers;
    }
#endif

    public void TrainingReportAddUser(int userId) {
        string sql = "INSERT INTO TrainingReportUsers (UserId) " + "VALUES ('" + userId + "') ";

        db.Open();
        db.Execute(sql);
        return;
    }

    public void TECNExpirationAddUser(int userId) {
        string sql = "INSERT INTO TECNNotificationsUsers (UserId) " + "VALUES ('" + userId + "') ";

        db.Open();
        db.Execute(sql);

        return;
    }

    public void TrainingReportDeleteUser(int userId) {
        DynamicParameters parameters = new();
        parameters.Add("@UserID", userId);

        db.Execute("DeleteUserFromTrainingReport", parameters, commandType: CommandType.StoredProcedure);
        return;
    }

    public void TECNExpirationDeleteUser(int userId) {
        DynamicParameters parameters = new();
        parameters.Add("@UserID", userId);

        db.Execute("DeleteUserFromTECNReport", parameters, commandType: CommandType.StoredProcedure);
        return;
    }

    public List<TrainingGroup> GetTrainingGroups() {
#if !NET8
        var TrainingGroups = from a in FabApprovalDB.TrainingGroups select a;
        List<TrainingGroup> GroupsToReturn = TrainingGroups.ToList();

        return GroupsToReturn;
#endif
#if NET8
    throw new NotImplementedException();
#endif
    }

#if !NET8

    public void AddNewTrainingGroup(string groupName) {
        TrainingGroup existing = null;
        // Check to see that the group name doesn't exist.
        try {
            existing = (from a in FabApprovalDB.TrainingGroups where a.TrainingGroupName == groupName select a).FirstOrDefault();
        } catch {
        }


        if (existing == null) {
            string sql = "INSERT INTO TrainingGroups (TrainingGroupName) " + "VALUES ('" + groupName + "') ";

            this.db.Open();
            this.db.Execute(sql);
            return;
        } else {
            return;
        }
    }
#endif

    public void DeleteTrainingGroup(int groupID) {
        try {
            string sql = "DELETE FROM TrainingGroups WHERE TrainingGroupID = " + groupID;
            db.Open();
            db.Execute(sql);

            sql = "DELETE FROM TrainingGroupMembers WHERE TrainingGroupID = " + groupID;
            db.Execute(sql);
            return;
        } catch {
        }
    }

#if !NET8
    public List<TrainingGroupMember> GetTrainingGroupMembers(int GroupID) {
        return (from a in FabApprovalDB.TrainingGroupMembers where a.TrainingGroupID == GroupID select a).ToList();
    }

    public void AddUserToGroup(int userId, int groupId) {
        UserAccountDMO userDB = new UserAccountDMO();
        string userFullName = userDB.GetUserByID(userId).FullName;

        TrainingGroupMember existing = null;

        existing = (from a in FabApprovalDB.TrainingGroupMembers where a.TrainingGroupID == groupId && a.UserID == userId select a).FirstOrDefault();
        if (existing == null) {
            var parameters = new DynamicParameters();

            parameters = new DynamicParameters();
            parameters.Add("@GroupID", groupId);
            parameters.Add("@UserID", userId);
            parameters.Add("@UserFullName", userFullName);

            this.db.Execute("AddUserToTrainingGroup", parameters, commandType: CommandType.StoredProcedure);
        } else {
            throw new Exception("The user already exists in this training group.");
        }

    }
#endif
    public void DeleteFromGroup(int userId, int groupId) {
        DynamicParameters parameters = new();
        parameters.Add("@GroupID", groupId);
        parameters.Add("@UserID", userId);

        db.Execute("DeleteUserFromTrainingGroup", parameters, commandType: CommandType.StoredProcedure);

        return;
    }

    public void DeleteUser(UserAccountDMO userDMO, TrainingDMO trainingDMO, LoginModel loginModel) {
        if (loginModel != null) {
            userDMO.DeleteUser(loginModel);
            // Remove open trainings
            // Get a list of all user assigned trainings.
            List<TrainingAssignment> trainingAssignments = trainingDMO.GetTrainingAssignmentsByUserID(loginModel.UserID);

            // Go Through that list.
            foreach (var trainingAssignment in trainingAssignments) {
                // Delete Any document acknowledgements.
                trainingDMO.DeleteTrainingDocAck(trainingAssignment.ID);
                // Delete the training assignment itself
                trainingDMO.DeleteTrainingAssignment(trainingAssignment.ID);
                // Check the parent Training task to set to to complete if applicable.
                if (trainingDMO.CheckTrainingStatus(trainingAssignment.ID)) {
                    int TrainingID = trainingAssignment.TrainingID;
                    // Set Training status to complete
                    trainingDMO.UpdateTrainingStatus(TrainingID);
                }

            }

            // Remove user from any Training Groups
            DeleteUserFromAllTrainingGroups(loginModel.UserID);

            // Remove User from training report notifications
            TrainingReportDeleteUser(loginModel.UserID);
            // Remove user from TECN Expiration Notifications
            TECNExpirationDeleteUser(loginModel.UserID);
            // Get user subroles
            List<UserSubRoles> userSubRoles = GetUserSubRoles(loginModel.UserID);
            // Delete user from any subroles
            foreach (var userSubRole in userSubRoles) {
                DeleteUserRoles(userSubRole.SubRoleID, loginModel.UserID.ToString());
            }
        }
    }

}