@page "/doctor/patients_medical_history"
@attribute [Authorize(Roles = UserRoles.Doctor)]
@layout DoctorLayout
@inject IDoctorManagementService DoctorManagementService
@inject IAuthenticationService AuthenticationService
@inject IJSRuntime JSRuntime

<script src="fileHelper.js"></script>
<script src="downloadFile.js"></script>

<h3>Patient Medical Histories</h3>


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

<div class="row mt-4">
    @foreach (var patient in patients)
    {
        <div class="col-md-4 mb-4">
            <div class="card">
                <div class="card-body text-center">
                    <div>
                        <strong>Status: </strong>
                        @if (patientHasAccess(patient.Id))
                        {
                            <span class="text-success">Granted</span>
                        }
                        else
                        {
                            <span class="text-danger">Revoked</span>
                        }
                    </div>
                    <img src="user.png" style="width: 70px" alt="Patient" class="img-fluid mt-3"/>
                    <h5 class="mt-3">@patient.Name</h5>
                    <button class="btn btn-info mt-2" @onclick="() => DownloadMedicalHistory(patient.Id)" disabled="@(patientHasAccess(patient.Id) ? false : true)">Download Medical History</button>
                </div>
            </div>
        </div>
    }
</div>

@code {
    private string statusMessage;
    private bool isSuccess;
    private List<Patient> patients = new();
    private List<Guid> grantedAccessPatients = new();

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

    private async Task LoadPatientsAndAccessStatus()
    {
        var userInfo = await AuthenticationService.GetUserInformation();
        patients = await DoctorManagementService.GetAllPatientsAsync();
        await UpdatePatientAccessStatuses(userInfo.Id);
    }

    private async Task UpdatePatientAccessStatuses(Guid doctorId)
    {
        foreach (var patient in patients)
        {
            var medicalHistory = await DoctorManagementService.GetMedicalHistoryAsync(patient.Id);
            if (medicalHistory == null) continue;
            if (await DoctorManagementService.CheckForAccessAsync(medicalHistory.Id, doctorId))
            {
                grantedAccessPatients.Add(patient.Id);
            }
        }

        StateHasChanged();
    }

    private bool patientHasAccess(Guid patientId)
    {
        return grantedAccessPatients.Contains(patientId);
    }

    private async Task DownloadMedicalHistory(Guid patientId)
    {
        var medicalHistory = await DoctorManagementService.DownloadMedicalHistoryAsync(patientId);
        if (medicalHistory != null)
        {
            var base64 = Convert.ToBase64String(medicalHistory);
            var href = $"data:application/octet-stream;base64,{base64}";
            await JSRuntime.InvokeVoidAsync("downloadFile", "MedicalHistory.pdf", href);
        }
        else
        {
            statusMessage = "Failed to download medical history.";
            isSuccess = false;
        }
    }

}