@page "/patient/medical_history"

@attribute [Authorize(Roles = UserRoles.Patient)]
@layout PatientLayout

@inject IPatientManagementService PatientManagementService
@inject IAuthenticationService AuthenticationService
@inject NavigationManager NavigationManager
@inject IJSRuntime JSRuntime

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

<h3>Medical History</h3>

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

@if (uploadedFile != null)
{
    <div class="card mt-4">
        <div class="card-header">
            Medical History
        </div>
        <div class="card-body">
            <img src="pngtree-pdf-file-icon-png-png-image_4899509.png" style="width:100px" alt="Medical Document" id="medicalDocument"/>
            <div class="mt-4">
                <button class="btn btn-primary" @onclick="PromptFileUpdate">Update</button>
                <button class="btn btn-danger" @onclick="DeleteFile">Delete</button>
                <button class="btn btn-secondary" @onclick="DownloadFile">Download</button>
            </div>
        </div>
    </div>
}
else
{
    <div class="card mt-4">
        <div class="card-header">
            Upload Medical History
        </div>
        <div class="card-body">
            <InputFile OnChange="HandleFileSelected"/>
        </div>
    </div>
}


@code {
    private MedicalHistory uploadedFile;
    private string statusMessage;
    private bool isSuccess;

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

    private async Task CheckMedicalHistory()
    {
        var userInfo = await AuthenticationService.GetUserInformation();
        uploadedFile = await PatientManagementService.GetMedicalHistoryAsync(userInfo.Id);
        StateHasChanged();
    }

    private async Task HandleFileSelected(InputFileChangeEventArgs e)
    {
        var file = e.File;
        if (file == null)
        {
            statusMessage = "No file selected.";
            isSuccess = false;
            StateHasChanged();
            return;
        }

        // Check if the file MIME type is 'application/pdf'
        if (!file.ContentType.Equals("application/pdf", StringComparison.OrdinalIgnoreCase))
        {
            statusMessage = "Only PDF files are allowed.";
            isSuccess = false;
            StateHasChanged();
            return;
        }

        using var memoryStream = new MemoryStream();
        await file.OpenReadStream().CopyToAsync(memoryStream);
        var fileContent = memoryStream.ToArray();

        var userInfo = await AuthenticationService.GetUserInformation();
        var response = await PatientManagementService.UploadMedicalHistoryAsync(userInfo.Id, fileContent);

        statusMessage = response.Message;
        isSuccess = response.StatusCode == HttpStatusCodes.Created; // Assume HttpStatusCodes.Created represents successful upload
        await CheckMedicalHistory();

        StateHasChanged();
    }


    private void PromptFileUpdate()
    {
        JSRuntime.InvokeVoidAsync("document.getElementById", "hiddenFileInput");
    }

    private async Task DeleteFile()
    {
        if (uploadedFile != null)
        {
            var success = await PatientManagementService.DeleteMedicalHistoryAsync(uploadedFile.Id);
            if (success)
            {
                uploadedFile = null;
                statusMessage = "File deleted successfully.";
                isSuccess = true;
                StateHasChanged();
            }
            else
            {
                statusMessage = "Failed to delete file.";
                isSuccess = false;
            }
        }
    }

    private async Task DownloadFile()
    {
        if (uploadedFile != null)
        {
            var fileContent = await PatientManagementService.DownloadMedicalHistoryAsync(uploadedFile.Id);
            if (fileContent != null)
            {
                var base64 = Convert.ToBase64String(fileContent);
                var href = $"data:application/octet-stream;base64,{base64}";
                await JSRuntime.InvokeVoidAsync("downloadFile", "MedicalHistory.pdf", href);
            }
        }
    }

}