<?php

namespace App\Filament\Tenant\Resources\WorkOrderResource\RelationManagers;

use App\Models\Tenant\Part;
use App\Models\Tenant\PartReservation;
use App\Models\Tenant\WorkOrderPart;
use App\Services\Warehouse\WarehouseService;
use App\Tenancy\TenantManager;
use Filament\Actions;
use Filament\Forms;
use Filament\Notifications\Notification;
use Filament\Resources\RelationManagers\RelationManager;
use Filament\Schemas\Components\Utilities\Get;
use Filament\Schemas\Components\Utilities\Set;
use Filament\Schemas\Schema;
use Filament\Tables;
use Filament\Tables\Table;

class PartsRelationManager extends RelationManager
{
    protected static string $relationship = 'parts';

    protected static ?string $title = null;

    public static function getTitle(\Illuminate\Database\Eloquent\Model $ownerRecord, string $pageClass): string
    {
        return __('Piese');
    }

    private static function minMargin(): float
    {
        $company = app(TenantManager::class)->current();
        return (float) data_get($company?->settings, 'min_discount_margin_pct', 0);
    }

    public function form(Schema $schema): Schema
    {
        return $schema->components([
            Forms\Components\Select::make('part_id')
                ->label(__('Din catalog (lasă gol pentru text liber)'))
                ->options(fn () => Part::where('is_active', true)
                    ->get()
                    ->mapWithKeys(fn ($p) => [$p->id => "{$p->name} " . ($p->article ? "[{$p->article}] " : '') . "(stoc: {$p->qty})"])
                    ->toArray())
                ->searchable()
                ->live()
                ->afterStateUpdated(function ($state, Set $set) {
                    if ($state && $part = Part::find($state)) {
                        $set('name', $part->name);
                        $set('article', $part->article);
                        $set('brand', $part->brand);
                        if ($part->unit_id) { $set('unit_id', $part->unit_id); } else { $set('unit', $part->unit); }
                        $set('buy_price', $part->buy_price);
                        $set('sell_price', $part->sell_price);
                    }
                })
                ->columnSpanFull(),
            Forms\Components\TextInput::make('name')->label(__('Denumire'))->required()->columnSpanFull(),
            Forms\Components\TextInput::make('article')->label(__('Cod articol'))->maxLength(64),
            Forms\Components\TextInput::make('brand')->maxLength(64),
            Forms\Components\TextInput::make('qty')->label(__('Cantitate'))->numeric()->default(1)->required(),
            Forms\Components\Select::make('unit_id')->label(__('UM'))->options(\App\Models\Tenant\Unit::forSelect())->searchable()->default(fn () => \App\Models\Tenant\Unit::where('code','buc')->value('id'))->default('buc'),
            Forms\Components\TextInput::make('buy_price')->label(__('Preț achiziție'))->numeric()->default(0),
            Forms\Components\TextInput::make('sell_price')->label(__('Preț vânzare'))->numeric()->required(),
            Forms\Components\TextInput::make('discount_pct')
                ->label(__('Reducere %'))
                ->numeric()
                ->default(0)
                ->minValue(0)
                ->maxValue(100)
                ->step(0.01)
                ->live(onBlur: true)
                ->rules([
                    fn (Get $get): \Closure => function (string $attribute, $value, \Closure $fail) use ($get) {
                        $sellPrice = max(0, (float) $get('sell_price'));
                        $buyPrice  = max(0, (float) $get('buy_price'));
                        $disc      = min(100, max(0, (float) $value));
                        $effective = round($sellPrice * (1 - $disc / 100), 2);

                        if ($buyPrice > 0 && $effective < $buyPrice) {
                            $fail(__('Prețul efectiv (:eff MDL) este sub prețul de achiziție (:buy MDL).', [
                                'eff' => number_format($effective, 2),
                                'buy' => number_format($buyPrice, 2),
                            ]));
                            return;
                        }

                        $minMargin = self::minMargin();
                        if ($minMargin > 0 && $sellPrice > 0 && $buyPrice > 0 && $effective > 0) {
                            $margin = ($effective - $buyPrice) / $effective * 100;
                            if ($margin < $minMargin) {
                                $fail(__('Marja (:m%) este sub limita minimă (:min%). Necesită permisiune specială.', [
                                    'm'   => number_format($margin, 1),
                                    'min' => number_format($minMargin, 1),
                                ]));
                            }
                        }
                    },
                ])
                ->helperText(function (Get $get, $state) {
                    $sellPrice = max(0, (float) $get('sell_price'));
                    $buyPrice  = max(0, (float) $get('buy_price'));
                    $disc      = min(100, max(0, (float) $state));
                    if ($sellPrice <= 0) return null;
                    $effective = round($sellPrice * (1 - $disc / 100), 2);
                    $minMargin = self::minMargin();
                    if ($buyPrice > 0) {
                        $margin = $effective > 0 ? ($effective - $buyPrice) / $effective * 100 : 0;
                        $color  = ($effective < $buyPrice) ? '🔴' : (($minMargin > 0 && $margin < $minMargin) ? '🟠' : '🟢');
                        return "{$color} " . __('Efectiv:') . ' ' . number_format($effective, 2) . ' MDL · ' . __('Marjă:') . ' ' . number_format($margin, 1) . '%';
                    }
                    return __('Efectiv:') . ' ' . number_format($effective, 2) . ' MDL';
                }),
            Forms\Components\Select::make('status')
                ->options(\App\Support\I18n::opts(WorkOrderPart::STATUSES))
                ->default('needed')
                ->required()
                ->helperText(__('La trecere pe „Montată" se scade automat din stoc.')),
            Forms\Components\Textarea::make('notes')->label(__('Observații'))->columnSpanFull()->rows(2),
        ]);
    }

    public function table(Table $table): Table
    {
        return $table
            ->recordTitleAttribute('name')
            ->columns([
                Tables\Columns\TextColumn::make('name')->label(__('Piesă'))->wrap(),
                Tables\Columns\TextColumn::make('article')->label(__('Cod'))->placeholder('—'),
                Tables\Columns\TextColumn::make('brand')->placeholder('—'),
                Tables\Columns\TextColumn::make('qty')->label(__('Cant.'))->alignRight(),
                Tables\Columns\TextColumn::make('sell_price')->label(__('Preț'))->money('MDL')->alignRight(),
                Tables\Columns\TextColumn::make('discount_pct')->label(__('Disc.'))->alignRight()
                    ->formatStateUsing(fn ($state) => $state > 0 ? number_format((float)$state, 1) . '%' : '—')
                    ->color(fn ($state) => $state > 0 ? 'warning' : null),
                Tables\Columns\TextColumn::make('total')->money('MDL')->alignRight(),
                Tables\Columns\TextColumn::make('status')
                    ->formatStateUsing(fn ($s) => __(WorkOrderPart::STATUSES[$s] ?? $s))
                    ->badge()
                    ->colors([
                        'gray' => ['needed'],
                        'warning' => ['ordered'],
                        'info' => ['delivered'],
                        'success' => ['installed'],
                    ]),
            ])
            ->headerActions([
                Actions\CreateAction::make()
                    ->label(__('Adaugă piesă'))
                    ->modalHeading(__('Adaugă piesă în fișă')),

                Actions\Action::make('bulk_discount_parts')
                    ->label(__('Reducere globală'))
                    ->icon('heroicon-m-tag')
                    ->color('warning')
                    ->schema([
                        Forms\Components\TextInput::make('discount_pct')
                            ->label(__('Reducere % (toate piesele)'))
                            ->numeric()
                            ->minValue(0)
                            ->maxValue(100)
                            ->step(0.01)
                            ->required()
                            ->helperText(__('Aplică același % de reducere la toate piesele din această fișă.')),
                    ])
                    ->action(function (array $data) {
                        $disc      = min(100, max(0, (float) $data['discount_pct']));
                        $minMargin = self::minMargin();
                        $blocked   = 0;

                        foreach ($this->getOwnerRecord()->parts as $part) {
                            $sell      = (float) $part->sell_price;
                            $buy       = (float) $part->buy_price;
                            $effective = round($sell * (1 - $disc / 100), 2);

                            if ($buy > 0 && $effective < $buy) { $blocked++; continue; }
                            if ($minMargin > 0 && $sell > 0 && $buy > 0 && $effective > 0) {
                                $margin = ($effective - $buy) / $effective * 100;
                                if ($margin < $minMargin) { $blocked++; continue; }
                            }
                            $part->update(['discount_pct' => $disc]);
                        }

                        $msg = $blocked > 0
                            ? __(':n piese blocate (sub limita de marjă sau preț achiziție).', ['n' => $blocked])
                            : null;

                        Notification::make()
                            ->title(__('Reducere aplicată'))
                            ->body($msg)
                            ->{$blocked > 0 ? 'warning' : 'success'}()
                            ->send();
                    }),
            ])
            ->actions([
                Actions\Action::make('smart_price')
                    ->label(__('Preț inteligent'))
                    ->icon('heroicon-m-sparkles')
                    ->color('primary')
                    ->visible(fn (WorkOrderPart $r) => (bool) $r->part_id)
                    ->modalHeading(__('Preț contextual'))
                    ->modalSubmitActionLabel('Aplică prețul')
                    ->modalContent(function (WorkOrderPart $r) {
                        $wo = $r->workOrder;
                        $part = $r->part;
                        $quote = app(\App\Services\Pricing\PricingEngine::class)->quote(
                            $part, $wo?->vehicle, $wo?->client, $wo?->urgency ?? 'normal'
                        );
                        return view('filament.tenant.smart-price', ['quote' => $quote, 'item' => $r]);
                    })
                    ->action(function (WorkOrderPart $r) {
                        $wo = $r->workOrder;
                        $quote = app(\App\Services\Pricing\PricingEngine::class)->quote(
                            $r->part, $wo?->vehicle, $wo?->client, $wo?->urgency ?? 'normal'
                        );
                        $r->sell_price = $quote['final'];
                        $r->save();
                        Notification::make()
                            ->title('Preț actualizat: ' . number_format($quote['final'], 2) . ' MDL')
                            ->success()->send();
                    }),
                Actions\Action::make('issue_now')
                    ->label(__('Eliberează'))
                    ->icon('heroicon-m-arrow-up-on-square')
                    ->color('warning')
                    ->visible(fn (WorkOrderPart $r) => $r->part_id
                        && PartReservation::where('work_order_part_id', $r->id)
                            ->where('status', PartReservation::STATUS_ACTIVE)
                            ->exists())
                    ->requiresConfirmation()
                    ->modalDescription('Confirmă că mecanicul ia fizic piesa din depozit. Stocul scade acum, fără să aștepți închiderea fișei.')
                    ->action(function (WorkOrderPart $r) {
                        $n = app(WarehouseService::class)->issueNow($r);
                        Notification::make()
                            ->title("Eliberat: {$n} rezervări consumate")
                            ->success()->send();
                    }),
                Actions\Action::make('return_part')
                    ->label(__('Restituire'))
                    ->icon('heroicon-m-arrow-uturn-left')
                    ->color('gray')
                    ->visible(fn (WorkOrderPart $r) => $r->part_id
                        && PartReservation::where('work_order_part_id', $r->id)
                            ->where('status', PartReservation::STATUS_CONSUMED)
                            ->exists())
                    ->schema([
                        Forms\Components\TextInput::make('qty')
                            ->label(__('Cantitate restituită'))
                            ->numeric()
                            ->required()
                            ->minValue(0.001)
                            ->default(fn (WorkOrderPart $r) => (float) $r->qty),
                        Forms\Components\Textarea::make('notes')->rows(2)->label(__('Observații')),
                    ])
                    ->action(function (WorkOrderPart $r, array $data) {
                        $batch = app(WarehouseService::class)->returnPart(
                            $r, (float) $data['qty'], $data['notes'] ?? null
                        );
                        Notification::make()
                            ->title($batch ? __('Piesa returnată în stoc') : __('Nimic de restituit'))
                            ->{$batch ? 'success' : 'warning'}()
                            ->send();
                    }),
                Actions\EditAction::make(),
                Actions\DeleteAction::make(),
            ])
            ->emptyStateHeading(__('Nicio piesă montată.'))
            ->emptyStateDescription(__('Adaugă piesele necesare din catalog. Stocul se rezervă automat, iar la marcarea „Montată" scade FIFO.'))
            ->emptyStateIcon('heroicon-o-cube');
    }
}