<?php

namespace App\Services;

use App\Models\Tenants\CondolenceExpense;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\DB;

class CondolenceExpenseService extends Service
{
    /**
     * 목록 조회 (페이지네이션 + 필터)
     */
    public function index(array $params): LengthAwarePaginator
    {
        $query = CondolenceExpense::query();

        // 연도 필터
        if (! empty($params['year'])) {
            $query->inYear((int) $params['year']);
        }

        // 카테고리 필터
        if (! empty($params['category']) && $params['category'] !== 'all') {
            $query->byCategory($params['category']);
        }

        // 통합 검색
        if (! empty($params['search'])) {
            $search = $params['search'];
            $query->where(function ($q) use ($search) {
                $q->where('partner_name', 'like', "%{$search}%")
                    ->orWhere('description', 'like', "%{$search}%")
                    ->orWhere('memo', 'like', "%{$search}%");
            });
        }

        // 정렬
        $sortBy = $params['sort_by'] ?? 'event_date';
        $sortOrder = $params['sort_order'] ?? 'desc';
        $query->orderBy($sortBy, $sortOrder)->orderByDesc('id');

        $perPage = $params['per_page'] ?? 50;

        return $query->paginate($perPage);
    }

    /**
     * 상세 조회
     */
    public function show(int $id): CondolenceExpense
    {
        return CondolenceExpense::with('creator:id,name')->findOrFail($id);
    }

    /**
     * 등록
     */
    public function store(array $data): CondolenceExpense
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        return DB::transaction(function () use ($data, $tenantId, $userId) {
            return CondolenceExpense::create([
                'tenant_id' => $tenantId,
                'event_date' => $data['event_date'] ?? null,
                'expense_date' => $data['expense_date'] ?? null,
                'partner_name' => $data['partner_name'],
                'description' => $data['description'] ?? null,
                'category' => $data['category'],
                'has_cash' => $data['has_cash'] ?? false,
                'cash_method' => ($data['has_cash'] ?? false) ? ($data['cash_method'] ?? null) : null,
                'cash_amount' => ($data['has_cash'] ?? false) ? ($data['cash_amount'] ?? 0) : 0,
                'has_gift' => $data['has_gift'] ?? false,
                'gift_type' => ($data['has_gift'] ?? false) ? ($data['gift_type'] ?? null) : null,
                'gift_amount' => ($data['has_gift'] ?? false) ? ($data['gift_amount'] ?? 0) : 0,
                'total_amount' => $this->calculateTotal($data),
                'memo' => $data['memo'] ?? null,
                'created_by' => $userId,
                'updated_by' => $userId,
            ]);
        });
    }

    /**
     * 수정
     */
    public function update(int $id, array $data): CondolenceExpense
    {
        $userId = $this->apiUserId();

        return DB::transaction(function () use ($id, $data, $userId) {
            $expense = CondolenceExpense::findOrFail($id);

            $expense->fill([
                'event_date' => $data['event_date'] ?? $expense->event_date,
                'expense_date' => $data['expense_date'] ?? $expense->expense_date,
                'partner_name' => $data['partner_name'] ?? $expense->partner_name,
                'description' => $data['description'] ?? $expense->description,
                'category' => $data['category'] ?? $expense->category,
                'has_cash' => $data['has_cash'] ?? $expense->has_cash,
                'cash_method' => ($data['has_cash'] ?? $expense->has_cash) ? ($data['cash_method'] ?? $expense->cash_method) : null,
                'cash_amount' => ($data['has_cash'] ?? $expense->has_cash) ? ($data['cash_amount'] ?? $expense->cash_amount) : 0,
                'has_gift' => $data['has_gift'] ?? $expense->has_gift,
                'gift_type' => ($data['has_gift'] ?? $expense->has_gift) ? ($data['gift_type'] ?? $expense->gift_type) : null,
                'gift_amount' => ($data['has_gift'] ?? $expense->has_gift) ? ($data['gift_amount'] ?? $expense->gift_amount) : 0,
                'total_amount' => $this->calculateTotal(array_merge($expense->toArray(), $data)),
                'memo' => $data['memo'] ?? $expense->memo,
                'updated_by' => $userId,
            ]);

            $expense->save();

            return $expense->fresh();
        });
    }

    /**
     * 삭제 (소프트)
     */
    public function destroy(int $id): bool
    {
        $userId = $this->apiUserId();

        return DB::transaction(function () use ($id, $userId) {
            $expense = CondolenceExpense::findOrFail($id);
            $expense->deleted_by = $userId;
            $expense->save();
            $expense->delete();

            return true;
        });
    }

    /**
     * 통계 조회
     */
    public function summary(array $params): array
    {
        $query = CondolenceExpense::query();

        if (! empty($params['year'])) {
            $query->inYear((int) $params['year']);
        }

        if (! empty($params['category']) && $params['category'] !== 'all') {
            $query->byCategory($params['category']);
        }

        $stats = $query->selectRaw('
            COUNT(*) as total_count,
            COALESCE(SUM(total_amount), 0) as total_amount,
            COALESCE(SUM(cash_amount), 0) as cash_total,
            COALESCE(SUM(gift_amount), 0) as gift_total,
            COALESCE(SUM(CASE WHEN category = ? THEN 1 ELSE 0 END), 0) as congratulation_count,
            COALESCE(SUM(CASE WHEN category = ? THEN 1 ELSE 0 END), 0) as condolence_count,
            COALESCE(SUM(CASE WHEN category = ? THEN total_amount ELSE 0 END), 0) as congratulation_amount,
            COALESCE(SUM(CASE WHEN category = ? THEN total_amount ELSE 0 END), 0) as condolence_amount
        ', [
            CondolenceExpense::CATEGORY_CONGRATULATION,
            CondolenceExpense::CATEGORY_CONDOLENCE,
            CondolenceExpense::CATEGORY_CONGRATULATION,
            CondolenceExpense::CATEGORY_CONDOLENCE,
        ])->first();

        return [
            'total_count' => (int) $stats->total_count,
            'total_amount' => (int) $stats->total_amount,
            'cash_total' => (int) $stats->cash_total,
            'gift_total' => (int) $stats->gift_total,
            'congratulation_count' => (int) $stats->congratulation_count,
            'condolence_count' => (int) $stats->condolence_count,
            'congratulation_amount' => (int) $stats->congratulation_amount,
            'condolence_amount' => (int) $stats->condolence_amount,
        ];
    }

    /**
     * 총금액 자동 계산
     */
    private function calculateTotal(array $data): int
    {
        $cash = ($data['has_cash'] ?? false) ? (int) ($data['cash_amount'] ?? 0) : 0;
        $gift = ($data['has_gift'] ?? false) ? (int) ($data['gift_amount'] ?? 0) : 0;

        return $cash + $gift;
    }
}