using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using VEPROMS.CSLA.Library;
using Volian.Base.Library;
using Volian.Controls.Library;
using System.Linq;


namespace VEPROMS
{
	//C2024-047 Redesign PROMS Security Dialog
	public partial class dlgManageSecurity : Form
	{
		#region Log4Net
		private static readonly log4net.ILog _MyLog = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
		#endregion

		#region Main Form / Shared Code
		private GroupInfoList myGroupInfoList;
		private UserInfoList myUserInfoList;
		private List<MembershipInfo> myMembershipInfoList;
		private Folder myFolder;

		public dlgManageSecurity()
		{
			InitializeComponent();
		}
		private void dlgManageSecurity_Load(object sender, EventArgs e)
		{
			//load all folders
			myFolder = Folder.Get(1);

			//Default to Users Tab
			tcSecurity.SelectedIndex = 2;
		}

		//This is called when the Index Changes for main tab Control
		//it loads info for the current tab
		private void changedTab(object sender, EventArgs e)
		{
			LoadRefreshGroupUsers();

			switch (tcSecurity.SelectedIndex)
			{
				//Manage Folders
				case 0:
					SetupFolderOptions();
					break;
				//Manage Groups
				case 1:
					SetupGroups();
					break;
				//Manage Users (note that this is the default)
				case 2:
					SetupUserOptions();
					break;
                //Default Options tab
				case 3:
					SetupDefaultGroupOptions();
					break;
			}
		}
		//Loads a refreshed list of Groups and Users
		private void LoadRefreshGroupUsers()
		{
			GroupInfoList.Reset();
			myGroupInfoList = GroupInfoList.Get();
			UserInfoList.Reset();
			myUserInfoList = UserInfoList.Get();
		}
		#endregion

		#region Manage Folders
		//Sets up Folders
		private void SetupFolderOptions()
		{
			if (tvFolders.Nodes.Count == 0)
			{
				FolderInfo fi = FolderInfo.Get(1);
				LoadChildFolders(fi, null);
			}
		}
		//loads child folders in tree view
		private void LoadChildFolders(FolderInfo fi, TreeNode tn)
		{
			if (tn == null)
			{
				tn = tvFolders.Nodes.Add(fi.Name);
				tn.Tag = fi;
			}
			else
			{
				tn = tn.Nodes.Add(fi.Name);
				tn.Tag = fi;
			}
			if (fi.ChildFolderCount > 0)
			{
				foreach (FolderInfo fic in fi.SortedChildFolders)
				{
					LoadChildFolders(fic, tn);
				}
			}
		}
		//Handles Creating a New Group
		private void createGroupMenuItem(object sender, EventArgs e)
		{
			try
			{
				ToolStripDropDownItem tsddi = sender as ToolStripDropDownItem;
				TreeNode tn = tvFolders.SelectedNode;
				FolderInfo fi = tn.Tag as FolderInfo;
				AddNewGroup(tsddi.Text, fi);
			}
			catch (Exception ex)
			{
				_MyLog.Warn("createGroupMenuItem", ex);
			}
		}
		private void AddNewGroup(string txt, FolderInfo fi)
		{
			txt = txt.Replace("Create", "").Replace(" a ", "").Replace("Group", "").Trim();
			RoleInfoList ril = RoleInfoList.Get();
			// B2022-080: cannot add a new group in Proms security.  if the sql database's 'Roles' table was not initialized with the default roles, such as Set Administrator,
			//   Writer, Reviewer, RO Editor, the Adding of new groups won't work.  Databases should have this loaded by default.
			//   Promsfixes has queries that insert these, but only gets run if there are no assignments (see commands under --define Roles)
			if (ril == null || ril.Count < 2)
			{
				MessageBox.Show("Roles table is missing entries.\r\nPlease contact Volian to create other groups.", "Cannot create groups", MessageBoxButtons.OK, MessageBoxIcon.Warning);
				return;
			}

            foreach (var ri in ril.Where(ri => ri.Name == txt))
            {
                string gin = string.Format("{0}s - {1}", ri.Name, fi.Name);
                if (!myGroupInfoList.Any(gi => gi.GroupName == gin))
                {
                    Group group = Group.MakeGroup(gin, null, null);
                    Assignment.MakeAssignment(group, Role.Get(ri.RID), Folder.Get(fi.FolderID), null);
                }
            }

            LoadRefreshGroupUsers();
		}
		private void tvFolders_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
		{
			tvFolders.SelectedNode = e.Node;
		}

		#endregion

		#region Manage Groups
		//Sets up Group Options
		private void SetupGroups()
		{
			cbGroupSelection.Items.Clear();
			foreach (GroupInfo gi in myGroupInfoList)
				cbGroupSelection.Items.Add(gi.GroupName);
			cbGroupSelection.SelectedIndex = 0;
		}

		private void cbGroupSelection_SelectedIndexChanged(object sender, EventArgs e) => updateMembershipLists();

		//Updates the lists of members / nonMembers
		private void updateMembershipLists()
		{
			myMembershipInfoList = new List<MembershipInfo>();
			if (cbGroupSelection.SelectedIndex > -1)
			{
				GroupInfo gi = myGroupInfoList[cbGroupSelection.SelectedIndex];
				gi.RefreshGroupMemberships();
				if (gi.GroupMembershipCount > 0)
					myMembershipInfoList.AddRange(gi.GroupMemberships.Where(mi => mi.EndDate == null || mi.EndDate == string.Empty).OrderBy(x => x.MyUserUserID));
			}
			lstMembers.DataSource = myMembershipInfoList;
			lstMembers.ValueMember = "UID";
			lstMembers.DisplayMember = "MyUserUserID";

			//set NonMembers to Users that are not in Members
			lstNonMembers.DataSource = myUserInfoList.Select(x => x.UserID).Except(myMembershipInfoList.Select(x => x.MyUser.UserID)).ToList();
		}

		//Add a Member to a Group
		private void addMember_Click(object sender, EventArgs e)
		{
			int groupIndex = cbGroupSelection.SelectedIndex;
			string selectedUserID = lstNonMembers.SelectedValue.ToString();
			int selectedUID = UserInfo.GetByUserID(selectedUserID).UID;
			GroupInfo gi = myGroupInfoList[groupIndex];
			User selectedUser = User.Get(selectedUID);

			Membership.MakeMembership(selectedUser, Group.Get(gi.GID), null, "");
			updateMembershipLists();
			lstNonMembers.SelectedIndex = -1;

			int index = lstMembers.FindString(selectedUserID);
			lstMembers.SetSelected(index, true);
		}

		//Remove a Member From a Group
		private void removeMember_Click(object sender, EventArgs e)
		{
			if (lstMembers.SelectedIndex > -1)
			{
				MembershipInfo mi = (MembershipInfo)lstMembers.SelectedItem;
				string selectedUserID = mi.MyUserUserID;
				string msg = "Are you sure you want to remove this Group Member?";
				if (MessageBox.Show(this, msg, "Confirm Group Member Removal", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question) == DialogResult.Yes)
				{
					if (mi.MyGroup.GroupName == "Administrators" && mi.MyGroup.GroupMemberships.Count(mm => mm.EndDate == null || mm.EndDate == string.Empty) == 1)
					{
						MessageBox.Show("You must have at least 1 user assigned to the Administrators group", "One Administrator Required", MessageBoxButtons.OK, MessageBoxIcon.Warning);
						return;
					}
					Membership m = Membership.Get(mi.UGID);
					m.EndDate = DateTime.Now.ToShortDateString();
					m.Save();
					updateMembershipLists();
					lstMembers.SelectedIndex = -1;
					lstNonMembers.SelectedItem = selectedUserID;
				}
			}
		}

		//Deletes the Currently Selected Group
		private void deleteGroup_Click(object sender, EventArgs e)
		{
			if (cbGroupSelection.SelectedIndex < 0)
			{
				MessageBox.Show("You must select a group to delete", "No Group Selected", MessageBoxButtons.OK, MessageBoxIcon.Warning);
				return;
			}
			GroupInfo gi = myGroupInfoList[cbGroupSelection.SelectedIndex];
			if(myFolder.FolderConfig.Security_Group == gi.GID)
			{
				MessageBox.Show("Cannot Delete Default Group", "Attempt to Delete Default", MessageBoxButtons.OK, MessageBoxIcon.Warning);
				return;
			}
			bool deleteOK = true;
            if (gi.GroupMembershipCount > 0 && gi.GroupMemberships.Any(mi => mi.EndDate == null || mi.EndDate == string.Empty))
                deleteOK = false;
            if (!deleteOK)
			{
				MessageBox.Show("There are still users who are members of this group.  You need to delete all members in order to delete this group.", "Group Has Members", MessageBoxButtons.OK, MessageBoxIcon.Warning);
				return;
			}
			if (MessageBox.Show("Are you sure you want to delete this group?", "Confirm Deleting Group", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question) == DialogResult.Yes)
			{
				Group.Delete(gi.GID);
				LoadRefreshGroupUsers();
				SetupGroups();
			}
		}

		#endregion

		#region Manage Users

		//Sets up UserOptions
		private void SetupUserOptions()
		{
			lstUsers.Items.Clear();
			foreach (UserInfo ui in myUserInfoList)
				lstUsers.Items.Add(ui.UserID);
			lstUsers.SelectedIndex = -1;
			lstGroups.DataSource = null;
		}

		#region Manage Users - User Options

		//Build Membership list based on selected user
		private void lstUsers_SelectedIndexChanged(object sender, EventArgs e)
		{
			myMembershipInfoList = new List<MembershipInfo>();
			if (lstUsers.SelectedIndex > -1)
			{
				UserInfo ui = myUserInfoList[lstUsers.SelectedIndex];
				if (ui.UserMembershipCount > 0)
				{
					myMembershipInfoList.AddRange(ui.UserMemberships.Where(mi => mi.EndDate == null || mi.EndDate == string.Empty));
				}
			}

			lstGroups.DataSource = myMembershipInfoList;
			lstGroups.ValueMember = "UGID";
			lstGroups.DisplayMember = "MyGroupName";
		}

		//Select User and set up Mouse Click Menus based on
		//where click in User Box
		private void lstUsers_MouseUp(object sender, MouseEventArgs e)
		{
			if (e.Button == MouseButtons.Right)
			{
				int k = lstUsers.IndexFromPoint(e.Location);
				if (k >= 0)
				{
					lstUsers.SelectedIndex = k;
					editUserToolStripMenuItem.Visible = deleteUserToolStripMenuItem.Visible = true;
				}
				else
				{
					addUserToolStripMenuItem.Visible = true;
					editUserToolStripMenuItem.Visible = deleteUserToolStripMenuItem.Visible = false;
				}

				cmUsers.Show(lstUsers, e.Location);
			}
			else if (e.Button == MouseButtons.Left)
			{
				int k = lstUsers.IndexFromPoint(e.Location);
				if (k >= 0)
				{
					lstUsers.SelectedIndex = k;
				}
			}
		}

		//Adds a new User
		private void addUserToolStripMenuItem_Click(object sender, EventArgs e)
		{
			User u = User.MakeUser("[Enter New UserID]", "", "", "", "", "", "", "", "", "", "", DateTime.Now, "");
			frmManageUser frm = new frmManageUser("add");
			frm.MyUser = u;
			if (frm.ShowDialog(this) == DialogResult.OK)
			{
				u = frm.MyUser;
				u.Save();
				Membership.MakeMembership(u, Group.Get(myFolder.FolderConfig.Security_Group), "", "");

				//Update the User list to reflect the added user
				LoadRefreshGroupUsers();
				SetupUserOptions();
				lstUsers.SelectedItem = u.UserID;
			}
			else
			{
				u.Delete();
			}
		}

		//Edit a User's details
		private void editUserToolStripMenuItem_Click(object sender, EventArgs e)
		{
			if (lstUsers.SelectedIndex == -1)
			{
				MessageBox.Show("You must select a user to edit", "No User Selected", MessageBoxButtons.OK, MessageBoxIcon.Warning);
				return;
			}
			UserInfo ui = myUserInfoList[lstUsers.SelectedIndex];
			using (User u = User.Get(ui.UID))
			{
				frmManageUser frm = new frmManageUser("edit");
				frm.MyUser = u;
				if (frm.ShowDialog(this) == DialogResult.OK)
				{
					frm.MyUser.Save();

					//Update the User list to reflect the edited user
					//this is done in case the UserID is updated so the list updates to reflect that
					LoadRefreshGroupUsers();
					SetupUserOptions();
					lstUsers.SelectedItem = u.UserID;
				}
			}
		}

		//Delete a User
		private void deleteUserToolStripMenuItem_Click(object sender, EventArgs e)
		{
			if (lstUsers.SelectedIndex == -1)
			{
				MessageBox.Show("You must select a user to delete", "No User Selected", MessageBoxButtons.OK, MessageBoxIcon.Warning);
				return;
			}
			UserInfo ui = myUserInfoList[lstUsers.SelectedIndex];
			SessionInfoList sil = SessionInfoList.Get();
			foreach (SessionInfo si in sil)
			{
				if (si.UserID == ui.UserID && (si.DTSEnd == null))
				{
					MessageBox.Show("The user selected has an active session.  You may not delete the user at this time.", "User Active Session", MessageBoxButtons.OK, MessageBoxIcon.Warning);
					return;
				}
			}
			int nummemberships = ui.UserMemberships.Count(mi => mi.EndDate == null || mi.EndDate == string.Empty);
			string mem_text = nummemberships > 0 ? "\r\nNote that this will remove all memberships that this user has." : "";
			if (MessageBox.Show($"Are you sure you want to delete this user?{mem_text}", "Confirm Deleting User", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question) == DialogResult.Yes)
			{
				foreach (MembershipInfo minfo in ui.UserMemberships.Where(mi => mi.EndDate == null || mi.EndDate == string.Empty))
                {
					Membership m = Membership.Get(minfo.UGID);
					m.EndDate = DateTime.Now.ToShortDateString();
					m.Save();
				}

				User.Delete(ui.UID);

				//Update the User list to reflect the deleted user
				LoadRefreshGroupUsers();
				SetupUserOptions();
				lstUsers.SelectedIndex = -1;
				lstGroups.DataSource = null;
			}
		}

		#endregion

		#region Manage Users - Member Options

		//Adds Context Menu for when a Group is selected
		private void lstGroups_MouseUp(object sender, MouseEventArgs e)
		{
			cmMembers.Items.Clear();
			lstGroups.SelectedIndex = -1;

			if (e.Button == MouseButtons.Right)
			{
				int k = lstGroups.IndexFromPoint(e.Location);
				if (k >= 0)
				{
					lstGroups.SelectedIndex = k;
					cmMembers.Items.Add(this.removeMemberToolStripMenuItem);

				}

				var groupsCanAddTo = myGroupInfoList.Select(x => new { x.GroupName, x.GID }).Except(myMembershipInfoList.Select(x => new { x.MyGroup.GroupName, x.GID }));
				foreach (var possiblegroup in groupsCanAddTo)
				{
					ToolStripMenuItemwithValue AddToMenuItem = new ToolStripMenuItemwithValue($"Add as Member to Group: {possiblegroup.GroupName}", possiblegroup.GID);
					AddToMenuItem.Click += addMemberToolStripMenuItem_Click;
					cmMembers.Items.Add(AddToMenuItem);
				}

				cmMembers.Show(lstGroups, e.Location);

			}
			else if (e.Button == MouseButtons.Left)
			{
				int k = lstGroups.IndexFromPoint(e.Location);
				if (k >= 0)
				{
					lstGroups.SelectedIndex = k;
				}
			}
		}

		//Adds a User to a Group
		private void addMemberToolStripMenuItem_Click(object sender, EventArgs e)
		{
			ToolStripMenuItemwithValue item = (ToolStripMenuItemwithValue)sender;
			int userIndex = lstUsers.SelectedIndex;
			UserInfo ui = myUserInfoList[userIndex];

			Membership.MakeMembership(User.Get(ui.UID), Group.Get((int) item.Value), null, "");

			//Update the Group list to reflect the added group
			LoadRefreshGroupUsers();
			lstUsers_SelectedIndexChanged(sender, e);
		}

		//Removes a User from a Group
		private void removeMemberToolStripMenuItem_Click(object sender, EventArgs e)
		{
			MembershipInfo mi = (MembershipInfo)lstGroups.SelectedItem;
			string msg = "Are you sure you want to remove this Group Member?";
			if (MessageBox.Show(this, msg, "Confirm Group Member Removal", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question) == DialogResult.Yes)
			{
                if (mi.MyGroup.GroupName == "Administrators" && mi.MyGroup.GroupMemberships.Count(mm => mm.EndDate == null || mm.EndDate == string.Empty) == 1)
                {
                    MessageBox.Show("You must have at least 1 user assigned to the Administrators group", "One Administrator Required", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    return;
                }
                Membership m = Membership.Get(mi.UGID);
				m.EndDate = DateTime.Now.ToShortDateString();
				m.Save();

				//Update the Group list to reflect the removed group
				LoadRefreshGroupUsers();
				lstUsers_SelectedIndexChanged(sender, e);
			}
		}

		#endregion

		#endregion

		#region Default Options
		//Sets up Default Group options for Default Tab
		private void SetupDefaultGroupOptions()
		{
			pnlGroups.Controls.Clear();
			foreach (GroupInfo gi in myGroupInfoList)
			{
				RadioButton rb = new RadioButton();
				rb.Text = gi.GroupName;
				rb.Parent = pnlGroups;
				rb.Dock = DockStyle.Top;
				rb.Tag = gi;
				rb.CheckedChanged -= new EventHandler(rb_CheckedChanged);
				rb.CheckedChanged += new EventHandler(rb_CheckedChanged);
				pnlGroups.Controls.Add(rb);
				rb.BringToFront();
				if (myFolder.FolderConfig.Security_Group == 0 && gi.GID == 1)
				{
					myFolder.FolderConfig.Security_Group = gi.GID;
					rb.Checked = true;
					myFolder.Save();
				}
				else if (myFolder.FolderConfig.Security_Group == gi.GID)
				{
					rb.Checked = true;
				}
			}
		}
		//Handles changing the default group
		private void rb_CheckedChanged(object sender, EventArgs e)
		{
			RadioButton rb = sender as RadioButton;
			GroupInfo gi = rb.Tag as GroupInfo;
			label8.Text = gi.GroupAssignments[0].MyRole.Title + " for " + gi.GroupAssignments[0].MyFolder.Name;
			myFolder.FolderConfig.Security_Group = gi.GID;
			myFolder.Save();
		}
		#endregion

	}
}