<?php

namespace App\Services;

use App\Models\TreasuryAccount;
use App\Models\TreasuryLaunch;
use Illuminate\Database\Eloquent\Collection;

class TreasuryAccountService
{
    /**
     * Lista as contas de tesouraria por escopo:
     * - franqueador (rede/conta-mãe): sem unit_id => contas com unit_id null;
     * - franchisee: unit_id da unidade ativa => contas daquela unidade.
     * Cada conta recebe o saldo (entradas - saídas dos lançamentos).
     */
    public function getAll(?int $unitId = null): Collection
    {
        $accounts = TreasuryAccount::query()
            ->when(
                $unitId !== null,
                fn ($query) => $query->where('unit_id', $unitId),
                fn ($query) => $query->whereNull('unit_id'),
            )
            ->orderBy('created_at', 'desc')
            ->get();

        $this->attachBalances($accounts);

        return $accounts;
    }

    /**
     * Calcula o saldo de cada conta em duas agregações:
     * saldo = soma das entradas (to_account) - soma das saídas (from_account).
     */
    private function attachBalances(Collection $accounts): void
    {
        $ids = $accounts->pluck('id');

        if ($ids->isEmpty()) {
            return;
        }

        $incoming = TreasuryLaunch::whereIn('to_account_id', $ids)
            ->groupBy('to_account_id')
            ->selectRaw('to_account_id, SUM(amount) as total')
            ->pluck('total', 'to_account_id');

        $outgoing = TreasuryLaunch::whereIn('from_account_id', $ids)
            ->groupBy('from_account_id')
            ->selectRaw('from_account_id, SUM(amount) as total')
            ->pluck('total', 'from_account_id');

        foreach ($accounts as $account) {
            $balance = (float) ($incoming[$account->id] ?? 0) - (float) ($outgoing[$account->id] ?? 0);
            $account->setAttribute('balance', $balance);
        }
    }

    public function findById(int $id): ?TreasuryAccount
    {
        return TreasuryAccount::find($id);
    }

    public function create(array $data): TreasuryAccount
    {
        // Sem unit_id => conta da rede (franqueador). Com unit_id => conta da unidade (franchisee).
        $data['unit_id'] = $data['unit_id'] ?? null;

        return TreasuryAccount::create($data);
    }

    public function update(int $id, array $data): ?TreasuryAccount
    {
        $model = $this->findById($id);

        if (!$model) {
            return null;
        }

        $model->update($data);
        return $model->fresh();
    }

    public function delete(int $id): bool
    {
        $model = $this->findById($id);

        if (!$model) {
            return false;
        }

        return $model->delete();
    }

    // Add custom business logic methods here
}