@inject IApprovalService approvalService
@inject ISnackbar snackbar
@inject MesaFabApprovalAuthStateProvider authStateProvider

<MudDialog>
    <DialogContent>
        @if (availableApprovers is not null) {
            <MudPaper Class="p-2">
                <MudSelect T="User"
                           Label="Select a User"
                           Required
                           Variant="Variant.Outlined"
                           AnchorOrigin="Origin.BottomCenter"
                           @bind-Value=selectedUser
                           Text="@(selectedUser is null ? "" : selectedUser.GetFullName())">
                    @foreach (User user in availableApprovers) {
                        <MudSelectItem Value="@user">
                            @user.GetFullName()
                        </MudSelectItem>
                    }
                </MudSelect>
            </MudPaper>
        }
    </DialogContent>
    <DialogActions>
        <MudButton Variant="Variant.Filled"
                   Color="Color.Tertiary"
                   Class="m1-auto"
                   OnClick=Submit>
            <MudText>Submit</MudText>
        </MudButton>
        <MudButton Variant="Variant.Filled"
                   Color="Color.Secondary"
                   Class="m1-auto"
                   OnClick=Cancel>
            <MudText>Cancel</MudText>
        </MudButton>
    </DialogActions>
</MudDialog>

<MudOverlay Visible=processing DarkBackground="true" AutoClose="false">
    <MudProgressCircular Color="Color.Info" Size="Size.Medium" Indeterminate="true" />
</MudOverlay>

@code {
    [CascadingParameter] MudDialogInstance MudDialog { get; set; }

    [Parameter]
    public User selectedUser { get; set; }

    private bool processing = false;

    private HashSet<User> availableApprovers = new();

    protected override async Task OnInitializedAsync() {
        try {
            processing = true;

            string roleName = "QA_PRE_APPROVAL";
            string subRoleName = "QA_PRE_APPROVAL";

            IEnumerable<User> qaApprovers = await GetApprovalGroupMembersForRoleAndSubRole(roleName, subRoleName);

            foreach (User approver in qaApprovers)
                availableApprovers.Add(approver);

            roleName = "MRB Approver";
            subRoleName = "MRBApprover";

            IEnumerable<User> mrbApprovers = await GetApprovalGroupMembersForRoleAndSubRole(roleName, subRoleName);

            foreach (User approver in mrbApprovers)
                availableApprovers.Add(approver);

            selectedUser = availableApprovers.First();

            processing = false;
        } catch (Exception ex) {
            processing = false;
            snackbar.Add($"Unable to get all approvers, because {ex.Message}", Severity.Error);
        }
    }

    private void Submit() {
        MudDialog.Close(DialogResult.Ok(selectedUser));
    }

    private void Cancel() {
        MudDialog.Close(DialogResult.Cancel());
    }

    private async Task<IEnumerable<User>> GetApprovalGroupMembersForRoleAndSubRole(string roleName, string subRoleName) {
        HashSet<User> members = new();

        int roleId = await approvalService.GetRoleIdForRoleName(roleName);

        if (roleId <= 0) throw new Exception($"could not find {roleName} role ID");

        IEnumerable<SubRole> subRoles = await approvalService.GetSubRolesForSubRoleName(subRoleName, roleId);

        foreach (SubRole subRole in subRoles) {
            IEnumerable<User> subRoleMembers = await approvalService.GetApprovalGroupMembers(subRole.SubRoleID);

            foreach (User member in subRoleMembers) {
                members.Add(member);
            }
        }

        return members;
    }
}