@using Indotalent.ConfigBackEnd.Extensions
@using Indotalent.Features.Sales.Invoice.Cqrs
@using Indotalent.Features.Sales.Invoice.Components
@using Indotalent.Shared.Utils
@using MudBlazor
@using Microsoft.JSInterop
@inject InvoiceService InvoiceService
@inject ISnackbar Snackbar
@inject IJSRuntime JSRuntime

<MudPaper Elevation="0" Square="true" Class="pa-6 mb-3 d-flex align-center justify-space-between" Style="border: 1px solid #DCEBFA;">
    <div class="d-flex align-center gap-4">
        <MudIconButton Icon="@Icons.Material.Filled.ArrowBack" OnClick="() => OnCancel.InvokeAsync()" />
        <div>
            <MudText Typo="Typo.h5" Style="font-weight: 900; color: #1a1a1a;">@(ReadOnly ? "Details" : "Edit") Invoice</MudText>
            <MudText Typo="Typo.body2" Style="color: #64748b;">@_model.AutoNumber</MudText>
        </div>
    </div>
    @if (ReadOnly || !string.IsNullOrEmpty(_model.Id))
    {
        <MudButton Variant="Variant.Filled"
                   Color="Color.Info"
                   StartIcon="@(_isPrinting ? null : Icons.Material.Filled.Print)"
                   OnClick="DownloadPdf"
                   Disabled="_isPrinting"
                   Style="border-radius: 4px; text-transform: none; font-weight: 700; box-shadow: none;">
            @if (_isPrinting)
            {
                <MudProgressCircular Class="ms-n1" Size="Size.Small" Indeterminate="true" />
                <MudText Class="ms-2">Generating PDF...</MudText>
            }
            else
            {
                <MudText>Print PDF</MudText>
            }
        </MudButton>
    }
</MudPaper>

<MudPaper Elevation="0" Outlined="true" Class="pa-8" Style="border-radius: 4px; border: 1px solid #DCEBFA;">
    <MudForm @ref="_form" Model="_model">
        <MudGrid Spacing="3">
            <MudItem xs="12"><MudText Typo="Typo.button" Color="Color.Primary" Style="font-weight: 800;">Basic Information</MudText><MudDivider /></MudItem>

            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2" Class="mb-0">Invoice Date</MudText>
                <MudDatePicker @bind-Date="_model.InvoiceDate" ReadOnly="ReadOnly"
                               Variant="Variant.Outlined" Margin="Margin.Dense" />
            </MudItem>

            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2" Class="mb-0">Sales Order Reference</MudText>
                <MudSelect T="string" Value="_model.SalesOrderId"
                           ValueChanged="OnSalesOrderChanged"
                           ReadOnly="ReadOnly"
                           Variant="Variant.Outlined" Margin="Margin.Dense" Dense="true" FullWidth="true"
                           AnchorOrigin="Origin.BottomCenter" TransformOrigin="Origin.TopCenter">
                    @foreach (var item in _lookup.SalesOrders)
                    {
                        <MudSelectItem Value="@item.Id">@item.Name</MudSelectItem>
                    }
                </MudSelect>
            </MudItem>

            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2" Class="mb-0">Status</MudText>
                <MudSelect T="Indotalent.Data.Enums.InvoiceStatus" @bind-Value="_model.InvoiceStatus"
                           ReadOnly="ReadOnly"
                           Variant="Variant.Outlined" Margin="Margin.Dense" Dense="true" FullWidth="true"
                           AnchorOrigin="Origin.BottomCenter" TransformOrigin="Origin.TopCenter">
                    @foreach (var item in _lookup.Statuses)
                    {
                        <MudSelectItem Value="@((Indotalent.Data.Enums.InvoiceStatus)item.Value)">@item.Name</MudSelectItem>
                    }
                </MudSelect>
            </MudItem>

            <MudItem xs="12">
                <MudText Typo="Typo.subtitle2" Class="mb-1">Description</MudText>
                <MudTextField @bind-Value="_model.Description"
                              ReadOnly="ReadOnly"
                              Variant="Variant.Outlined" Margin="Margin.Dense" Lines="2" FullWidth="true" />
            </MudItem>

            <MudItem xs="12" Class="mt-6">
                <_InvoiceSalesOrderItemDataTable Items="_items" ReadOnly="true" />
            </MudItem>

            <MudItem xs="12" sm="7"></MudItem>
            <MudItem xs="12" sm="5">
                <MudPaper Elevation="0" Outlined="true" Class="pa-4" Style="border-radius: 4px; background-color: #F8FAFC; border: 1px solid #DCEBFA;">
                    <MudText Typo="Typo.button" Color="Color.Primary" Style="font-weight: 800;" Class="mb-4 d-block">Payment Summary</MudText>
                    <div class="d-flex justify-space-between mb-2">
                        <MudText Typo="Typo.body2">Sub Total</MudText>
                        <MudText Typo="Typo.body2" Style="font-weight: 700;">@_beforeTax.ToString("N2")</MudText>
                    </div>
                    <div class="d-flex justify-space-between mb-2">
                        <MudText Typo="Typo.body2">Tax Amount</MudText>
                        <MudText Typo="Typo.body2" Style="font-weight: 700;">@_taxAmount.ToString("N2")</MudText>
                    </div>
                    <MudDivider Class="my-2" />
                    <div class="d-flex justify-space-between">
                        <MudText Typo="Typo.subtitle1" Style="font-weight: 900;">Total Amount</MudText>
                        <MudText Typo="Typo.subtitle1" Color="Color.Primary" Style="font-weight: 900;">@_afterTax.ToString("N2")</MudText>
                    </div>
                </MudPaper>
            </MudItem>

            <MudItem xs="12" Class="mt-4">
                <MudText Typo="Typo.button" Color="Color.Primary" Style="font-weight: 800;">Audit History</MudText>
                <MudDivider Class="mt-2 mb-4" />
            </MudItem>

            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2">Created At</MudText>
                <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@DateTimeExtensions.ToString(_model.CreatedAt)</MudText>
            </MudItem>
            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2">Created By</MudText>
                <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@(!string.IsNullOrEmpty(_model.CreatedBy) ? _model.CreatedBy : "System")</MudText>
            </MudItem>
            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2">Last Updated At</MudText>
                <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@DateTimeExtensions.ToString(_model.UpdatedAt)</MudText>
            </MudItem>
            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2">Last Updated By</MudText>
                <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@(!string.IsNullOrEmpty(_model.UpdatedBy) ? _model.UpdatedBy : "System")</MudText>
            </MudItem>
        </MudGrid>

        <div class="d-flex justify-end gap-2 mt-10">
            <MudButton OnClick="() => OnCancel.InvokeAsync()"
                       Variant="Variant.Outlined"
                       Disabled="_processing"
                       Style="border: 1px solid #e0e0e0; border-radius: 4px; text-transform: none; font-weight: 700;">
                @(ReadOnly ? "Back to List" : "Cancel")
            </MudButton>
            @if (!ReadOnly)
            {
                <MudButton Color="Color.Primary"
                           Variant="Variant.Filled"
                           OnClick="Submit"
                           Disabled="_processing"
                           Style="border-radius: 4px; text-transform: none; font-weight: 700;">
                    @if (_processing)
                    {
                        <MudProgressCircular Class="ms-n1" Size="Size.Small" Indeterminate="true" />
                        <MudText Class="ms-2">Updating...</MudText>
                    }
                    else
                    {
                        <MudText>Save Changes</MudText>
                    }
                </MudButton>
            }
        </div>
    </MudForm>
</MudPaper>

@code {
    [Parameter] public UpdateInvoiceRequest Data { get; set; } = new();
    [Parameter] public bool ReadOnly { get; set; } = false;
    [Parameter] public EventCallback OnCancel { get; set; }
    [Parameter] public EventCallback OnSuccess { get; set; }

    private MudForm _form = default!;
    private UpdateInvoiceRequest _model = new();
    private List<InvoiceSalesOrderItemResponse> _items = new();
    private InvoiceLookupResponse _lookup = new();
    private decimal _beforeTax = 0;
    private decimal _taxAmount = 0;
    private decimal _afterTax = 0;
    private bool _processing = false;
    private bool _isPrinting = false;

    protected override async Task OnInitializedAsync()
    {
        var resLookup = await InvoiceService.GetInvoiceLookupAsync();
        if (resLookup != null && resLookup.IsSuccess) _lookup = resLookup.Value ?? new();

        _model = Data;
        await RefreshItems();
    }

    private async Task OnSalesOrderChanged(string soId)
    {
        if (ReadOnly || _model.SalesOrderId == soId) return;
        _model.SalesOrderId = soId;
        await RefreshItems();
        Snackbar.Add("Sales Order reference changed. Payment summary and items have been updated.", Severity.Info);
    }

    private async Task RefreshItems()
    {
        if (string.IsNullOrEmpty(_model.SalesOrderId)) return;

        try
        {
            var response = await InvoiceService.GetSalesOrderDetailForInvoiceAsync(_model.SalesOrderId);
            await Task.Delay(500);
            
            if (response != null && response.IsSuccess && response.Value != null)
            {
                _items = response.Value.Items ?? new();
                _beforeTax = response.Value.BeforeTaxAmount ?? 0;
                _taxAmount = response.Value.TaxAmount ?? 0;
                _afterTax = response.Value.AfterTaxAmount ?? 0;
                StateHasChanged();
            }
        }
        catch (Exception ex)
        {
            Snackbar.Add($"Error: {ex.Message}", Severity.Error);
        }
    }

    private async Task DownloadPdf()
    {
        try
        {
            _isPrinting = true;
            StateHasChanged();
            await Task.Delay(1000);

            var response = await InvoiceService.GetInvoiceByIdAsync(_model.Id!);
            if (response != null && response.IsSuccess && response.Value != null)
            {
                var pdfBytes = InvoicePdfGenerator.Generate(response.Value);
                var fileName = $"INV_{response.Value.AutoNumber}.pdf";
                var base64 = Convert.ToBase64String(pdfBytes);
                await JSRuntime.InvokeVoidAsync("downloadFile", fileName, "application/pdf", base64);
                Snackbar.Add("PDF generated successfully.", Severity.Success);
            }
        }
        finally
        {
            _isPrinting = false;
            StateHasChanged();
        }
    }

    private async Task Submit()
    {
        await _form.Validate();
        if (!_form.IsValid) return;

        _processing = true;
        try
        {
            var response = await InvoiceService.UpdateInvoiceAsync(_model);
            await Task.Delay(500);

            if (response != null && response.IsSuccess)
            {
                Snackbar.Add("Updated successfully", Severity.Success);
                await OnSuccess.InvokeAsync();
            }
        }
        finally
        {
            _processing = false;
        }
    }
}