@using Indotalent.Features.Purchase.Bill.Cqrs
@using Indotalent.Shared.Utils
@using MudBlazor
@inject BillService BillService
@inject ISnackbar Snackbar

<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;">Add Bill</MudText>
            <MudText Typo="Typo.body2" Style="color: #64748b;">Create a new vendor bill from Purchase Order.</MudText>
        </div>
    </div>
</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-1">Bill Date</MudText>
                <MudDatePicker @bind-Date="_model.BillDate"
                               Variant="Variant.Outlined" Margin="Margin.Dense" />
            </MudItem>

            <MudItem xs="12" sm="6">
                <MudText Typo="Typo.subtitle2" Class="mb-0">Purchase Order Reference</MudText>
                <MudSelect T="string" Value="_model.PurchaseOrderId"
                           ValueChanged="OnPurchaseOrderChanged"
                           For="@(() => _model.PurchaseOrderId)"
                           Variant="Variant.Outlined" Margin="Margin.Dense" Dense="true" FullWidth="true"
                           AnchorOrigin="Origin.BottomCenter" TransformOrigin="Origin.TopCenter">
                    @foreach (var item in _lookup.PurchaseOrders)
                    {
                        <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.BillStatus" @bind-Value="_model.BillStatus"
                           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.BillStatus)item.Value)">@item.Name</MudSelectItem>
                    }
                </MudSelect>
            </MudItem>

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

            <MudItem xs="12" Class="mt-6">
                <_BillPurchaseOrderItemDataTable 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>
        </MudGrid>

        <div class="d-flex justify-end gap-2 mt-8">
            <MudButton OnClick="() => OnCancel.InvokeAsync()"
                       Variant="Variant.Outlined"
                       Disabled="_processing"
                       Style="border-radius: 4px; text-transform: none; font-weight: 700;border: 1px solid #e0e0e0;">
                Cancel
            </MudButton>
            <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" Typo="Typo.button" Style="text-transform: none !important;">Processing...</MudText>
                }
                else
                {
                    <MudText>Create Bill</MudText>
                }
            </MudButton>
        </div>
    </MudForm>
</MudPaper>

@code {
    [Parameter] public EventCallback OnCancel { get; set; }
    [Parameter] public EventCallback OnSuccess { get; set; }

    private MudForm _form = default!;
    private CreateBillRequest _model = new() { BillDate = DateTime.Today, BillStatus = Indotalent.Data.Enums.BillStatus.Draft };
    private BillLookupResponse _lookup = new();
    private List<BillPurchaseOrderItemResponse> _items = new();
    private decimal _beforeTax = 0;
    private decimal _taxAmount = 0;
    private decimal _afterTax = 0;
    private bool _processing = false;

    protected override async Task OnInitializedAsync()
    {
        var res = await BillService.GetBillLookupAsync();
        if (res != null && res.IsSuccess) _lookup = res.Value ?? new();
    }

    private async Task OnPurchaseOrderChanged(string poId)
    {
        _model.PurchaseOrderId = poId;
        if (string.IsNullOrEmpty(poId))
        {
            _items.Clear();
            _beforeTax = 0;
            _taxAmount = 0;
            _afterTax = 0;
            return;
        }

        var res = await BillService.GetPurchaseOrderDetailForBillAsync(poId);
        await Task.Delay(500);
        if (res != null && res.IsSuccess && res.Value != null)
        {
            _items = res.Value.Items;
            _beforeTax = res.Value.BeforeTaxAmount ?? 0;
            _taxAmount = res.Value.TaxAmount ?? 0;
            _afterTax = res.Value.AfterTaxAmount ?? 0;
            Snackbar.Add("Purchase Order reference selected. Payment summary and items have been loaded.", Severity.Info);
        }
    }

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

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

            if (response != null && response.IsSuccess)
            {
                Snackbar.Add("Created successfully", Severity.Success);
                await OnSuccess.InvokeAsync();
            }
        }
        catch (Exception ex)
        {
            Snackbar.Add($"Error: {ex.Message}", Severity.Error);
        }
        finally
        {
            _processing = false;
        }
    }
}