<?php

namespace App\Services\Ai;

use App\Models\Tenant\Client;
use App\Models\Tenant\Part;
use App\Models\Tenant\Vehicle;
use App\Models\Tenant\WorkOrder;

/**
 * Executes tool calls dispatched by the chat AI. Each tool runs against the
 * current tenant context (BelongsToTenant scopes apply automatically) and
 * returns a small, AI-digestible result (capped row counts, truncated fields).
 */
class AiToolExecutor
{
    public const TOOLS = [
        [
            'name' => 'search_clients',
            'description' => 'Caută clienți după nume sau telefon (snippet, case-insensitive). Returnează max 10.',
            'input_schema' => [
                'type' => 'object',
                'properties' => [
                    'query' => ['type' => 'string', 'description' => 'Fragment nume sau telefon'],
                ],
                'required' => ['query'],
            ],
        ],
        [
            'name' => 'get_vehicle',
            'description' => 'Detalii vehicul după placă (plate) sau VIN, plus ultima fișă de lucru.',
            'input_schema' => [
                'type' => 'object',
                'properties' => [
                    'plate_or_vin' => ['type' => 'string', 'description' => 'Numărul de înmatriculare sau VIN'],
                ],
                'required' => ['plate_or_vin'],
            ],
        ],
        [
            'name' => 'find_parts',
            'description' => 'Caută piese în catalog după nume/cod/brand. Returnează max 15 cu stoc și preț.',
            'input_schema' => [
                'type' => 'object',
                'properties' => [
                    'query' => ['type' => 'string'],
                ],
                'required' => ['query'],
            ],
        ],
        [
            'name' => 'recent_workorders',
            'description' => 'Ultimele fișe de lucru deschise/recente. Folosește pentru a răspunde la „ce lucrăm acum".',
            'input_schema' => [
                'type' => 'object',
                'properties' => [
                    'limit' => ['type' => 'integer', 'description' => 'Câte (max 20)'],
                    'only_open' => ['type' => 'boolean', 'description' => 'Doar cele necelinate (default true)'],
                ],
            ],
        ],
        [
            'name' => 'low_stock_parts',
            'description' => 'Listează piesele cu stoc sub minimum (alertă reaprovizionare).',
            'input_schema' => [
                'type' => 'object',
                'properties' => [
                    'limit' => ['type' => 'integer'],
                ],
            ],
        ],
    ];

    /** @return array result payload, JSON-encodable */
    public function execute(string $name, array $input): array
    {
        return match ($name) {
            'search_clients' => $this->searchClients((string) ($input['query'] ?? '')),
            'get_vehicle' => $this->getVehicle((string) ($input['plate_or_vin'] ?? '')),
            'find_parts' => $this->findParts((string) ($input['query'] ?? '')),
            'recent_workorders' => $this->recentWorkOrders(
                (int) ($input['limit'] ?? 5),
                (bool) ($input['only_open'] ?? true),
            ),
            'low_stock_parts' => $this->lowStockParts((int) ($input['limit'] ?? 15)),
            default => ['error' => "unknown tool: {$name}"],
        };
    }

    private function searchClients(string $q): array
    {
        if (trim($q) === '') return ['rows' => []];
        $like = '%' . $q . '%';
        $rows = Client::where(fn ($w) => $w->where('name', 'like', $like)
                ->orWhere('phone', 'like', $like)
                ->orWhere('email', 'like', $like))
            ->limit(10)
            ->get(['id', 'name', 'phone', 'email', 'status'])
            ->toArray();
        return ['count' => count($rows), 'rows' => $rows];
    }

    private function getVehicle(string $key): array
    {
        if (trim($key) === '') return ['found' => false];
        $v = Vehicle::with('client:id,name,phone')
            ->where(fn ($w) => $w->where('plate', $key)->orWhere('vin', $key))
            ->first();
        if (! $v) return ['found' => false];
        $lastWo = WorkOrder::where('vehicle_id', $v->id)
            ->latest('opened_at')->first(['number', 'opened_at', 'status', 'total']);
        return [
            'found' => true,
            'id' => $v->id,
            'make' => $v->make, 'model' => $v->model, 'year' => $v->year,
            'plate' => $v->plate, 'vin' => $v->vin, 'mileage' => $v->mileage,
            'client' => $v->client ? ['name' => $v->client->name, 'phone' => $v->client->phone] : null,
            'last_workorder' => $lastWo,
        ];
    }

    private function findParts(string $q): array
    {
        if (trim($q) === '') return ['rows' => []];
        $like = '%' . $q . '%';
        $rows = Part::where('is_active', true)
            ->where(fn ($w) => $w->where('name', 'like', $like)
                ->orWhere('article', 'like', $like)
                ->orWhere('brand', 'like', $like))
            ->limit(15)
            ->get(['id', 'name', 'article', 'brand', 'category', 'qty', 'unit', 'sell_price'])
            ->toArray();
        return ['count' => count($rows), 'rows' => $rows];
    }

    private function recentWorkOrders(int $limit, bool $onlyOpen): array
    {
        $limit = max(1, min(20, $limit));
        $q = WorkOrder::with(['client:id,name', 'vehicle:id,plate'])
            ->orderByDesc('opened_at');
        if ($onlyOpen) $q->whereNotIn('status', ['done', 'cancelled']);
        $rows = $q->limit($limit)->get(['id', 'number', 'client_id', 'vehicle_id', 'status', 'opened_at', 'total']);
        return ['count' => $rows->count(), 'rows' => $rows->map(fn ($w) => [
            'number' => $w->number,
            'client' => $w->client?->name,
            'plate' => $w->vehicle?->plate,
            'status' => $w->status,
            'opened_at' => $w->opened_at?->toDateString(),
            'total' => (float) $w->total,
        ])->all()];
    }

    private function lowStockParts(int $limit): array
    {
        $limit = max(1, min(50, $limit));
        $rows = Part::where('is_active', true)
            ->whereColumn('qty', '<=', 'min_qty')
            ->orderBy('qty')
            ->limit($limit)
            ->get(['id', 'name', 'article', 'qty', 'min_qty', 'unit'])
            ->toArray();
        return ['count' => count($rows), 'rows' => $rows];
    }
}