@using Oqtane.Services
@using Oqtane.Modules
@using Oqtane.Models
@using Oqtane.Security
@using Oqtane.Shared
@namespace Oqtane.Modules.Controls
@inherits ModuleBase
@inject IRoleService RoleService
@inject IUserService UserService

@if (roles != null)
{
    <br />
    <table class="table">
        <tbody>
            <tr>
                <th>Role</th>
                @foreach (PermissionString permission in permissions)
                {
                    <th style="text-align: center;">@permission.PermissionName @EntityName</th>
                }
            </tr>
            @foreach (Role role in roles)
            {
                <tr>
                    <td>@role.Name</td>
                    @foreach (PermissionString permission in permissions)
                    {
                        var p = permission;
                        <td style="text-align: center;">
                            <TriStateCheckBox Value=@GetPermissionValue(p.Permissions, role.Name) Disabled=@GetPermissionDisabled(role.Name) OnChange="@(e => PermissionChanged(e, p.PermissionName, role.Name))" />
                        </td>
                    }
                </tr>
            }
        </tbody>
    </table>
    @if (@users.Count != 0)
    {
        <table class="table">
            <thead>
                <tr>
                    <th>User</th>
                    @foreach (PermissionString permission in permissions)
                    {
                        <th style="text-align: center;">@permission.PermissionName @EntityName</th>
                    }
                </tr>
            </thead>
            <tbody>
                @foreach (User user in users)
                {
                    string userid = "[" + user.UserId.ToString() + "]";
                    <tr>
                        <td>@user.DisplayName</td>
                        @foreach (PermissionString permission in permissions)
                        {
                            var p = permission;
                            <td style="text-align: center;">
                                <TriStateCheckBox Value=@GetPermissionValue(p.Permissions, userid) Disabled=@GetPermissionDisabled(userid) OnChange="@(e => PermissionChanged(e, p.PermissionName, userid))" />
                            </td>
                        }
                    </tr>
                }
            </tbody>
        </table>
    }
    <table class="table">
        <tbody>
            <tr>
                <td style="text-align: right;"><label for="Username" class="control-label">User: </label></td>
                <td><input type="text" name="Username" class="form-control" placeholder="Enter Username" @bind="@username" /></td>
                <td style="text-align: left;"><button type="button" class="btn btn-primary" @onclick="@AddUser">Add</button></td>
            </tr>
        </tbody>
    </table>
    <br />
    <ModuleMessage Type="MessageType.Error" Message="@message" />
}

@code {
    [Parameter]
    public string EntityName { get; set; }

    [Parameter]
    public string Permissions { get; set; }

    string permissionnames = "";
    List<Role> roles;
    List<PermissionString> permissions = new List<PermissionString>();
    List<User> users = new List<User>();
    string username = "";
    string message = "";

    protected override async Task OnInitializedAsync()
    {
        permissionnames = PageState.ModuleDefinitions.Find(item => item.ModuleDefinitionName == ModuleState.ModuleDefinitionName).Permissions;
        if (string.IsNullOrEmpty(permissionnames))
        {
            permissionnames = "View,Edit";
        }
        roles = await RoleService.GetRolesAsync(ModuleState.SiteId);
        roles.Insert(0, new Role { Name = Constants.AllUsersRole });

        foreach (string permissionname in permissionnames.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
        {
            permissions.Add(new PermissionString { PermissionName = permissionname, Permissions = "" });
        }
        foreach (PermissionString permissionstring in UserSecurity.GetPermissionStrings(Permissions))
        {
            if (permissions.Find(item => item.PermissionName == permissionstring.PermissionName) != null)
            {
                permissions[permissions.FindIndex(item => item.PermissionName == permissionstring.PermissionName)].Permissions = permissionstring.Permissions;
            }
            if (permissionstring.Permissions.Contains("["))
            {
                foreach (string user in permissionstring.Permissions.Split(new char[] { '[' }, StringSplitOptions.RemoveEmptyEntries))
                {
                    if (user.Contains("]"))
                    {
                        int userid = int.Parse(user.Substring(0, user.IndexOf("]")));
                        if (users.Where(item => item.UserId == userid).FirstOrDefault() == null)
                        {
                            users.Add(await UserService.GetUserAsync(userid, ModuleState.SiteId));
                        }
                    }
                }
            }
        }
    }

    private bool? GetPermissionValue(string Permissions, string SecurityKey)
    {
        if ((";" + Permissions + ";").Contains(";" + "!" + SecurityKey + ";"))
        {
            return false; // deny permission
        }
        else
        {
            if ((";" + Permissions + ";").Contains(";" + SecurityKey + ";"))
            {
                return true; // grant permission
            }
            else
            {
                return null; // not specified
            }
        }
    }

    private bool GetPermissionDisabled(string RoleName)
    {
        if (RoleName == Constants.AdminRole)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    private async Task AddUser()
    {
        if (users.Where(item => item.Username == username).FirstOrDefault() == null)
        {
            try
            {
                User user = await UserService.GetUserAsync(username, ModuleState.SiteId);
                if (user != null)
                {
                    users.Add(user);
                }
            }
            catch
            {
                message = "Username Does Not Exist";
            }
        }
        username = "";
    }

    private void PermissionChanged(bool? Value, string PermissionName, string SecurityId)
    {
        bool? selected = Value;
        PermissionString permission = permissions.Find(item => item.PermissionName == PermissionName);
        if (permission != null)
        {
            List<string> ids = permission.Permissions.Split(';').ToList();

            ids.Remove(SecurityId); // remove grant permission
            ids.Remove("!" + SecurityId); // remove deny permission

            switch (selected)
            {
                case true:
                    ids.Add(SecurityId); // add grant permission
                    break;
                case false:
                    ids.Add("!" + SecurityId); // add deny permission
                    break;
                case null:
                    break; // permission not specified
            }
            permissions[permissions.FindIndex(item => item.PermissionName == PermissionName)].Permissions = string.Join(";", ids.ToArray());
        }
    }

    public string GetPermissions()
    {
        return UserSecurity.SetPermissionStrings(permissions);
    }
}