<?php

namespace App\Services;

use App\Models\Barobill\BarobillBankTransaction;
use App\Models\Barobill\BarobillBankTransactionOverride;
use App\Models\Barobill\BarobillBankTransactionSplit;
use Illuminate\Support\Facades\DB;

/**
 * 바로빌 은행 거래 서비스 (React 연동용)
 *
 * MNG에서 동기화된 barobill_bank_transactions 데이터를
 * React 프론트엔드에서 조회/분개/수정 등 처리
 */
class BarobillBankTransactionService extends Service
{
    /**
     * 은행 거래 목록 조회 (기간별, 계좌번호별)
     */
    public function index(array $params): array
    {
        $tenantId = $this->tenantId();
        $startDate = $params['start_date'] ?? now()->startOfMonth()->format('Y-m-d');
        $endDate = $params['end_date'] ?? now()->format('Y-m-d');
        $accountNum = $params['bank_account_num'] ?? null;
        $search = $params['search'] ?? null;
        $perPage = $params['per_page'] ?? 50;

        $query = BarobillBankTransaction::where('tenant_id', $tenantId)
            ->whereBetween('trans_date', [$startDate, $endDate]);

        if ($accountNum) {
            $query->where('bank_account_num', $accountNum);
        }

        if ($search) {
            $query->where(function ($q) use ($search) {
                $q->where('summary', 'like', "%{$search}%")
                    ->orWhere('memo', 'like', "%{$search}%")
                    ->orWhere('client_name', 'like', "%{$search}%");
            });
        }

        $query->orderByDesc('trans_date')->orderByDesc('trans_dt');

        $transactions = $query->paginate($perPage);

        // 분할/오버라이드 정보 로드
        $uniqueKeys = $transactions->getCollection()->map->unique_key->toArray();

        $splits = BarobillBankTransactionSplit::where('tenant_id', $tenantId)
            ->whereIn('original_unique_key', $uniqueKeys)
            ->orderBy('sort_order')
            ->get()
            ->groupBy('original_unique_key');

        $overrides = BarobillBankTransactionOverride::getByUniqueKeys($tenantId, $uniqueKeys);

        $transactions->getCollection()->transform(function ($tx) use ($splits, $overrides) {
            $tx->splits = $splits->get($tx->unique_key, collect());
            $tx->has_splits = $tx->splits->isNotEmpty();
            $tx->override = $overrides->get($tx->unique_key);

            return $tx;
        });

        return [
            'data' => $transactions,
        ];
    }

    /**
     * 계좌 목록 (필터용)
     */
    public function accounts(): array
    {
        $tenantId = $this->tenantId();

        $accounts = BarobillBankTransaction::where('tenant_id', $tenantId)
            ->select('bank_account_num', 'bank_name')
            ->distinct()
            ->orderBy('bank_account_num')
            ->get();

        return ['items' => $accounts];
    }

    /**
     * 거래 분할 조회
     */
    public function getSplits(string $uniqueKey): array
    {
        $tenantId = $this->tenantId();
        $splits = BarobillBankTransactionSplit::getByUniqueKey($tenantId, $uniqueKey);

        return ['items' => $splits];
    }

    /**
     * 거래 분할 저장
     */
    public function saveSplits(string $uniqueKey, array $items): array
    {
        $tenantId = $this->tenantId();

        return DB::transaction(function () use ($tenantId, $uniqueKey, $items) {
            BarobillBankTransactionSplit::where('tenant_id', $tenantId)
                ->where('original_unique_key', $uniqueKey)
                ->delete();

            $created = [];
            foreach ($items as $index => $item) {
                $created[] = BarobillBankTransactionSplit::create([
                    'tenant_id' => $tenantId,
                    'original_unique_key' => $uniqueKey,
                    'split_amount' => $item['split_amount'],
                    'account_code' => $item['account_code'] ?? null,
                    'account_name' => $item['account_name'] ?? null,
                    'deduction_type' => $item['deduction_type'] ?? null,
                    'evidence_name' => $item['evidence_name'] ?? null,
                    'description' => $item['description'] ?? null,
                    'memo' => $item['memo'] ?? null,
                    'sort_order' => $index + 1,
                    'bank_account_num' => $item['bank_account_num'] ?? null,
                    'trans_dt' => $item['trans_dt'] ?? null,
                    'trans_date' => $item['trans_date'] ?? null,
                    'original_deposit' => $item['original_deposit'] ?? 0,
                    'original_withdraw' => $item['original_withdraw'] ?? 0,
                    'summary' => $item['summary'] ?? null,
                ]);
            }

            return ['items' => $created, 'count' => count($created)];
        });
    }

    /**
     * 거래 분할 삭제
     */
    public function deleteSplits(string $uniqueKey): array
    {
        $tenantId = $this->tenantId();
        $deleted = BarobillBankTransactionSplit::where('tenant_id', $tenantId)
            ->where('original_unique_key', $uniqueKey)
            ->delete();

        return ['deleted_count' => $deleted];
    }

    /**
     * 적요/분류 오버라이드 저장
     */
    public function saveOverride(string $uniqueKey, ?string $modifiedSummary, ?string $modifiedCast): BarobillBankTransactionOverride
    {
        $tenantId = $this->tenantId();

        return BarobillBankTransactionOverride::saveOverride($tenantId, $uniqueKey, $modifiedSummary, $modifiedCast);
    }

    /**
     * 수동 은행 거래 등록
     */
    public function storeManual(array $data): BarobillBankTransaction
    {
        $tenantId = $this->tenantId();

        return BarobillBankTransaction::create([
            'tenant_id' => $tenantId,
            'bank_account_num' => $data['bank_account_num'],
            'bank_code' => $data['bank_code'] ?? null,
            'bank_name' => $data['bank_name'] ?? null,
            'trans_date' => $data['trans_date'],
            'trans_time' => $data['trans_time'] ?? null,
            'trans_dt' => $data['trans_dt'] ?? $data['trans_date'].($data['trans_time'] ?? '000000'),
            'deposit' => $data['deposit'] ?? 0,
            'withdraw' => $data['withdraw'] ?? 0,
            'balance' => $data['balance'] ?? 0,
            'summary' => $data['summary'] ?? null,
            'cast' => $data['cast'] ?? null,
            'memo' => $data['memo'] ?? null,
            'trans_office' => $data['trans_office'] ?? null,
            'account_code' => $data['account_code'] ?? null,
            'account_name' => $data['account_name'] ?? null,
            'client_code' => $data['client_code'] ?? null,
            'client_name' => $data['client_name'] ?? null,
            'is_manual' => true,
        ]);
    }

    /**
     * 수동 은행 거래 수정
     */
    public function updateManual(int $id, array $data): BarobillBankTransaction
    {
        $tx = BarobillBankTransaction::where('tenant_id', $this->tenantId())
            ->where('is_manual', true)
            ->findOrFail($id);

        $tx->update($data);

        return $tx->fresh();
    }

    /**
     * 수동 은행 거래 삭제
     */
    public function destroyManual(int $id): bool
    {
        $tx = BarobillBankTransaction::where('tenant_id', $this->tenantId())
            ->where('is_manual', true)
            ->findOrFail($id);

        return $tx->delete();
    }

    /**
     * 잔액 요약
     */
    public function balanceSummary(array $params): array
    {
        $tenantId = $this->tenantId();
        $date = $params['date'] ?? now()->format('Y-m-d');

        $accounts = BarobillBankTransaction::where('tenant_id', $tenantId)
            ->select('bank_account_num', 'bank_name')
            ->distinct()
            ->get();

        $summary = [];
        foreach ($accounts as $account) {
            $lastTx = BarobillBankTransaction::where('tenant_id', $tenantId)
                ->where('bank_account_num', $account->bank_account_num)
                ->where('trans_date', '<=', $date)
                ->orderByDesc('trans_date')
                ->orderByDesc('trans_dt')
                ->first();

            $summary[] = [
                'bank_account_num' => $account->bank_account_num,
                'bank_name' => $account->bank_name,
                'balance' => $lastTx ? $lastTx->balance : 0,
                'last_trans_date' => $lastTx?->trans_date,
            ];
        }

        return ['items' => $summary];
    }
}