<?php

namespace Modules\Core\Payment\Filament\Resources;

use Filament\Actions\Action;
use Filament\Forms\Components\Select;
use Filament\Forms\Components\TextInput;
use Filament\Resources\Resource;
use Filament\Schemas\Components\Component;
use Filament\Schemas\Components\Utilities\Get;
use Filament\Tables\Columns\IconColumn;
use Filament\Tables\Columns\TextColumn;
use Filament\Tables\Columns\ToggleColumn;
use Filament\Tables\Table;
use Illuminate\Support\Facades\Event;
use Modules\Core\Payment\Events\PaymentMethodsReordered;
use Modules\Core\Payment\Filament\Resources\PaymentMethodResource\Pages\ListPaymentMethods;
use Modules\Core\Payment\Models\PaymentMethod;
use Modules\Core\Payment\Services\PaymentDriverRegistry;
use Modules\Core\Payment\Services\PaymentMethodCache;
use Modules\Core\Payment\Services\PaymentMethodService;

/**
 * The DB-instance layer for Payment (see docs/payments.md) — admin
 * creatable/deletable, same as Lunar's own ShippingMethodResource. A row's
 * `driver` is picked from a Select populated by
 * PaymentDriverRegistry::labels() (mirrors Modules\Core\Shipping\
 * Extensions\ShippingMethodResourceExtension::driverSelect()'s use of
 * Shipping::getSupportedDrivers()), not a hardcoded options list, and
 * never the raw driver class name — a third-party driver registered from
 * its own package's service provider shows up here with no change to
 * this class.
 *
 * Every write goes through Modules\Core\Payment\Services\
 * PaymentMethodService — create/edit/delete/the enabled toggle all call
 * it, not PaymentMethod::create()/update()/delete() directly, so cache
 * invalidation and event dispatch happen in one place. The ONE exception
 * is drag-to-reorder: Filament's own reorderTable() always writes the new
 * `position` values via its own raw bulk SQL query before our
 * afterReordering() hook ever runs — there is no seam to route that
 * specific write through the service (short of disabling drag-reorder
 * entirely and rebuilding it from scratch), so that hook only forgets the
 * cache and dispatches PaymentMethodsReordered; the data itself is
 * already correct in the database by the time it fires.
 *
 * `driver_missing_at` (set by the `boboko:payment:sync-drivers` command
 * when a row's driver no longer resolves) is surfaced as its own table
 * column, deliberately distinct from `enabled` — an admin needs to tell
 * "I turned this off" apart from "the driver code was removed" at a
 * glance, not have both look like the same disabled state.
 *
 * `authorized_status` only appears in the form when `capture_mode` is
 * "Hold now, charge later" — it's simply unreachable for a "Charge
 * immediately" method (that mode only ever produces PaymentCaptured,
 * never PaymentAuthorized), so showing it unconditionally would just be
 * a confusing, always-irrelevant field for most methods.
 */
class PaymentMethodResource extends Resource
{
    protected static ?string $model = PaymentMethod::class;

    protected static string|\BackedEnum|null $navigationIcon = 'heroicon-o-credit-card';

    protected static string|\UnitEnum|null $navigationGroup = 'Settings';

    protected static ?string $modelLabel = 'Payment Method';

    protected static ?string $pluralModelLabel = 'Payment Methods';

    public static function table(Table $table): Table
    {
        return $table
            ->columns([
                TextColumn::make('position')
                    ->label('Order')
                    ->sortable(),
                TextColumn::make('name')
                    ->label('Name')
                    ->searchable(),
                TextColumn::make('type')
                    ->label('Type'),
                TextColumn::make('driver')
                    ->label('Driver')
                    ->formatStateUsing(fn (?string $state) => static::driverLabel($state)),
                IconColumn::make('driver_missing_at')
                    ->label('Driver status')
                    ->boolean()
                    ->trueIcon('heroicon-o-exclamation-triangle')
                    ->falseIcon('heroicon-o-check-circle')
                    ->trueColor('danger')
                    ->falseColor('success')
                    ->tooltip(fn (PaymentMethod $record) => $record->driver_missing_at
                        ? 'Driver not found as of '.$record->driver_missing_at->diffForHumans()
                        : 'Driver resolves correctly'),
                ToggleColumn::make('enabled')
                    ->label('Enabled')
                    ->updateStateUsing(fn (PaymentMethod $record, $state) => app(PaymentMethodService::class)
                        ->update($record, ['enabled' => $state])),
                TextColumn::make('data.fee')
                    ->label('Fee')
                    ->formatStateUsing(fn (?int $state) => $state
                        ? number_format($state / 100, 2)
                        : '—'),
                TextColumn::make('updated_at')
                    ->label('Last updated')
                    ->dateTime(),
            ])
            ->reorderable('position')
            ->afterReordering(function (array $order) {
                app(PaymentMethodCache::class)->forget();

                Event::dispatch(new PaymentMethodsReordered(array_map('intval', array_values($order))));
            })
            ->recordActions([
                static::editAction(),
                static::editFeeAction(),
                static::deleteAction(),
            ])
            ->defaultSort('position');
    }

    /**
     * @return array<Component>
     */
    public static function getFormComponents(): array
    {
        return [
            TextInput::make('name')
                ->label('Name')
                ->required()
                ->maxLength(255),
            TextInput::make('type')
                ->label('Type')
                ->helperText('Machine-facing slug — stored on the cart/order, used by other code to identify this method. Cannot be changed once orders reference it.')
                ->required()
                ->unique(ignoreRecord: true)
                ->maxLength(255),
            static::getDriverFormComponent(),
            Select::make('capture_mode')
                ->label('Capture mode')
                ->helperText('Whether checkout charges immediately, or places a hold to settle later.')
                ->options([
                    'pay' => 'Charge immediately',
                    'authorize' => 'Hold now, charge later',
                ])
                ->default('pay')
                ->live()
                ->required(),
            static::getOrderStatusSelect('captured_status', 'Order status once paid')
                ->helperText('Applied the moment a payment is fully charged.'),
            static::getOrderStatusSelect('authorized_status', 'Order status once held')
                ->helperText('Applied the moment a hold is placed, before it\'s charged.')
                ->visible(fn (Get $get) => $get('capture_mode') === 'authorize'),
            static::getOrderStatusSelect('refunded_status', 'Order status once refunded')
                ->helperText('Applied when a payment taken through this method is refunded — even if the refund itself is processed through a different method.'),
        ];
    }

    public static function getDriverFormComponent(): Component
    {
        return Select::make('driver')
            ->label('Driver')
            ->options(fn () => app(PaymentDriverRegistry::class)->labels())
            ->required();
    }

    /**
     * Lunar's own Order::status is a plain, admin-extensible string
     * (config('lunar.orders.statuses')) rather than a fixed enum —
     * deliberately so a store can add its own custom status without a
     * code change (see docs/payments.md). This Select still reads from
     * that same open-ended list, just so an admin picks a real status
     * instead of typing a slug from memory.
     */
    private static function getOrderStatusSelect(string $name, string $label): Select
    {
        return Select::make($name)
            ->label($label)
            ->options(collect(config('lunar.orders.statuses', []))
                ->map(fn (array $status) => $status['label'] ?? $status)
                ->all())
            ->native(false);
    }

    public static function getPages(): array
    {
        return [
            'index' => ListPaymentMethods::route('/'),
        ];
    }

    public static function canCreate(): bool
    {
        return true;
    }

    public static function canDelete($record = null): bool
    {
        return true;
    }

    private static function editAction(): Action
    {
        return Action::make('edit')
            ->label('Edit')
            ->icon('heroicon-o-pencil-square')
            ->schema(static::getFormComponents())
            ->fillForm(fn (PaymentMethod $record) => $record->only([
                'name', 'type', 'driver', 'capture_mode', 'captured_status', 'authorized_status', 'refunded_status',
            ]))
            ->action(fn (PaymentMethod $record, array $data) => app(PaymentMethodService::class)->update($record, $data));
    }

    /**
     * $data['fee'] is stored as an integer minor unit (cents), matching
     * Lunar's own Price convention everywhere else in this codebase — the
     * form collects/displays a decimal and converts at the boundary.
     */
    private static function editFeeAction(): Action
    {
        return Action::make('edit_fee')
            ->label('Edit fee')
            ->icon('heroicon-o-pencil')
            ->schema([
                TextInput::make('fee')
                    ->label('Fee')
                    ->numeric()
                    ->minValue(0)
                    ->step(0.01)
                    ->helperText('Flat surcharge added when this payment method is selected.'),
            ])
            ->fillForm(fn (PaymentMethod $record) => [
                'fee' => filled($record->data['fee'] ?? null) ? $record->data['fee'] / 100 : null,
            ])
            ->action(function (PaymentMethod $record, array $data) {
                app(PaymentMethodService::class)->update($record, [
                    'data' => [
                        ...$record->data->toArray(),
                        'fee' => filled($data['fee']) ? (int) round($data['fee'] * 100) : null,
                    ],
                ]);
            });
    }

    private static function deleteAction(): Action
    {
        return Action::make('delete')
            ->label('Delete')
            ->icon('heroicon-o-trash')
            ->color('danger')
            ->requiresConfirmation()
            ->action(fn (PaymentMethod $record) => app(PaymentMethodService::class)->delete($record));
    }

    private static function driverLabel(?string $key): string
    {
        if ($key === null) {
            return '—';
        }

        return app(PaymentDriverRegistry::class)->label($key) ?? $key;
    }
}