@page "/patient/doctor_access"
@attribute [Authorize(Roles = UserRoles.Patient)]
@layout PatientLayout
@inject IPatientManagementService PatientManagementService
@inject IAuthenticationService AuthenticationService
@inject NavigationManager NavigationManager

<h3>Manage Access to Medical History</h3>

@if (!string.IsNullOrEmpty(statusMessage))
{
    <div class="alert @(isSuccess ? "alert-success" : "alert-danger")" role="alert">
        @statusMessage
    </div>
}

<div class="row mt-4">
    @foreach (var doctor in doctors)
    {
        <div class="col-md-4 mb-4">
            <div class="card">
                <div class="card-body text-center">
                    <div>
                        <strong>Status: </strong>
                        @if (doctorHasAccess(doctor.Id))
                        {
                            <span class="text-success">Granted</span>
                        }
                        else
                        {
                            <span class="text-danger">Revoked</span>
                        }
                    </div>
                    <img src="user.png" style="width: 70px" alt="Doctor" class="img-fluid mt-3"/>
                    <h5 class="mt-3">Dr. @doctor.Name</h5>
                    <button class="btn btn-success mt-2" @onclick="() => GrantAccess(doctor.Id)">Grant Access</button>
                    <button class="btn btn-warning mt-2" @onclick="() => RevokeAccess(doctor.Id)">Revoke Access</button>
                </div>
            </div>
        </div>
    }
</div>

@code {
    private string statusMessage;
    private bool isSuccess;
    private List<Doctor> doctors = new();
    private readonly List<Guid> grantedAccessDoctors = new();
    private Guid medicalRecordId;

    protected override async Task OnInitializedAsync()
    {
        await LoadDoctorsAndAccessStatus();
    }

    private async Task LoadDoctorsAndAccessStatus()
    {
        var userInfo = await AuthenticationService.GetUserInformation();
        var medicalHistory = await PatientManagementService.GetMedicalHistoryAsync(userInfo.Id);

        if (medicalHistory != null)
        {
            medicalRecordId = medicalHistory.Id;
            doctors = await PatientManagementService.GetAllDoctorsAsync();
            await UpdateDoctorAccessStatuses(userInfo.Id);
        }
        else
        {
            statusMessage = "Failed to load medical history.";
            isSuccess = false;
        }
    }

    private async Task UpdateDoctorAccessStatuses(Guid patientId)
    {
        if (medicalRecordId != Guid.Empty)
        {
            foreach (var doctor in doctors)
            {
                if (await PatientManagementService.CheckForAccessAsync(medicalRecordId, doctor.Id))
                {
                    grantedAccessDoctors.Add(doctor.Id);
                }
            }

            StateHasChanged();
        }
    }

    private bool doctorHasAccess(Guid doctorId)
    {
        return grantedAccessDoctors.Contains(doctorId);
    }

    private async Task GrantAccess(Guid doctorId)
    {
        if (medicalRecordId != Guid.Empty)
        {
            var success = await PatientManagementService.GrantAccessAsync(medicalRecordId, doctorId);
            if (success)
            {
                grantedAccessDoctors.Add(doctorId);
                statusMessage = "Access granted successfully.";
                isSuccess = true;
            }
            else
            {
                statusMessage = "Failed to grant access.";
                isSuccess = false;
            }

            StateHasChanged();
        }
    }

    private async Task RevokeAccess(Guid doctorId)
    {
        if (medicalRecordId != Guid.Empty)
        {
            var success = await PatientManagementService.RevokeAccessAsync(medicalRecordId, doctorId);
            if (success)
            {
                grantedAccessDoctors.Remove(doctorId);
                statusMessage = "Access revoked successfully.";
                isSuccess = true;
            }
            else
            {
                statusMessage = "Failed to revoke access.";
                isSuccess = false;
            }

            StateHasChanged();
        }
    }

}