<?php

namespace App\Services;

use App\Models\BadDebts\BadDebt;
use App\Models\Orders\Client;
use App\Models\Tenants\Approval;
use App\Models\Tenants\Deposit;
use App\Models\Tenants\ExpectedExpense;
use Carbon\Carbon;

/**
 * 종합 분석 보고서 서비스
 */
class ComprehensiveAnalysisService extends Service
{
    /**
     * 종합 분석 데이터 조회
     */
    public function getAnalysis(array $params): array
    {
        $date = isset($params['date']) ? Carbon::parse($params['date']) : Carbon::today();
        $month = $date->month;
        $year = $date->year;

        return [
            'today_issue' => $this->getTodayIssue($date),
            'monthly_expense' => $this->getMonthlyExpense($year, $month),
            'card_management' => $this->getCardManagement($year, $month),
            'entertainment' => $this->getEntertainment($year, $month),
            'welfare' => $this->getWelfare($year, $month),
            'receivable' => $this->getReceivable($year, $month),
            'debt_collection' => $this->getDebtCollection(),
        ];
    }

    /**
     * 오늘의 이슈 - 결재 대기 문서
     */
    protected function getTodayIssue(Carbon $date): array
    {
        $tenantId = $this->tenantId();

        $pendingApprovals = Approval::where('tenant_id', $tenantId)
            ->pending()
            ->with(['form', 'drafter'])
            ->orderBy('drafted_at', 'desc')
            ->limit(10)
            ->get();

        $categories = ['전체필터'];
        $items = [];

        foreach ($pendingApprovals as $approval) {
            $category = $approval->form?->name ?? '결재요청';
            if (! in_array($category, $categories)) {
                $categories[] = $category;
            }

            $items[] = [
                'id' => (string) $approval->id,
                'category' => $category,
                'description' => $approval->title,
                'requires_approval' => true,
                'time' => $approval->drafted_at?->format('H:i') ?? '',
            ];
        }

        return [
            'filter_options' => $categories,
            'items' => $items,
        ];
    }

    /**
     * 당월 예상 지출 내역
     */
    protected function getMonthlyExpense(int $year, int $month): array
    {
        $tenantId = $this->tenantId();

        // 이번 달 예상 지출 합계
        $expenses = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->selectRaw('transaction_type, SUM(amount) as total')
            ->groupBy('transaction_type')
            ->get()
            ->keyBy('transaction_type');

        // 미지급 금액
        $unpaidTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->where('payment_status', 'pending')
            ->sum('amount');

        // 지급 완료 금액
        $paidTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->where('payment_status', 'paid')
            ->sum('amount');

        // 연체 금액
        $overdueTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->where('expected_payment_date', '<', Carbon::today())
            ->where('payment_status', 'pending')
            ->sum('amount');

        $cards = [
            ['id' => 'expense-1', 'label' => '이번 달 예상 지출', 'amount' => (float) ($unpaidTotal + $paidTotal)],
            ['id' => 'expense-2', 'label' => '미지급 금액', 'amount' => (float) $unpaidTotal],
            ['id' => 'expense-3', 'label' => '지급 완료', 'amount' => (float) $paidTotal],
            ['id' => 'expense-4', 'label' => '연체 금액', 'amount' => (float) $overdueTotal],
        ];

        $checkPoints = [];
        if ($overdueTotal > 0) {
            $checkPoints[] = [
                'id' => 'expense-cp-1',
                'type' => 'warning',
                'message' => '연체 중인 지출이 있습니다.',
                'highlight' => number_format($overdueTotal).'원',
            ];
        }
        if ($unpaidTotal > $paidTotal * 2) {
            $checkPoints[] = [
                'id' => 'expense-cp-2',
                'type' => 'info',
                'message' => '미지급 금액이 지급 완료 금액보다 많습니다.',
            ];
        }

        return [
            'cards' => $cards,
            'check_points' => $checkPoints,
        ];
    }

    /**
     * 카드/가지급금 관리
     */
    protected function getCardManagement(int $year, int $month): array
    {
        $tenantId = $this->tenantId();

        // 가지급금 (suspense)
        $suspenseTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->where('transaction_type', 'suspense')
            ->where('payment_status', '!=', 'paid')
            ->sum('amount');

        // 선급금 (advance)
        $advanceTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->where('transaction_type', 'advance')
            ->where('payment_status', '!=', 'paid')
            ->sum('amount');

        // 이번 달 카드 사용액 (가상 - 실제로는 CardTransaction 등 필요)
        $monthlyCardUsage = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereIn('transaction_type', ['suspense', 'advance'])
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->sum('amount');

        // 미정산 금액
        $unsettledTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereIn('transaction_type', ['suspense', 'advance'])
            ->where('payment_status', 'pending')
            ->sum('amount');

        $cards = [
            ['id' => 'card-1', 'label' => '가지급금 잔액', 'amount' => (float) $suspenseTotal],
            ['id' => 'card-2', 'label' => '선급금 잔액', 'amount' => (float) $advanceTotal],
            ['id' => 'card-3', 'label' => '이번 달 카드 사용액', 'amount' => (float) $monthlyCardUsage],
            ['id' => 'card-4', 'label' => '미정산 금액', 'amount' => (float) $unsettledTotal],
        ];

        $checkPoints = [];
        if ($suspenseTotal > 10000000) {
            $checkPoints[] = [
                'id' => 'card-cp-1',
                'type' => 'warning',
                'message' => '가지급금이 1,000만원을 초과했습니다.',
                'highlight' => '정산이 필요합니다.',
            ];
        }
        if ($unsettledTotal > 0) {
            $checkPoints[] = [
                'id' => 'card-cp-2',
                'type' => 'info',
                'message' => '미정산 금액이 '.number_format($unsettledTotal).'원 있습니다.',
            ];
        }

        return [
            'cards' => $cards,
            'check_points' => $checkPoints,
        ];
    }

    /**
     * 접대비 현황
     */
    protected function getEntertainment(int $year, int $month): array
    {
        $tenantId = $this->tenantId();

        // 실제로는 expense_category 등으로 접대비 분류 필요
        // 현재는 기본값 반환
        $monthlyTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->where('transaction_type', 'other')
            ->sum('amount');

        $yearlyTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->where('transaction_type', 'other')
            ->sum('amount');

        $cards = [
            ['id' => 'ent-1', 'label' => '이번 달 접대비', 'amount' => (float) ($monthlyTotal * 0.1)],
            ['id' => 'ent-2', 'label' => '연간 접대비 누계', 'amount' => (float) ($yearlyTotal * 0.1)],
        ];

        $checkPoints = [];
        // 접대비 한도 초과 경고 (예시)
        $limit = 5000000; // 월 500만원 한도
        if ($monthlyTotal * 0.1 > $limit) {
            $checkPoints[] = [
                'id' => 'ent-cp-1',
                'type' => 'error',
                'message' => '접대비가 월 한도를 초과했습니다.',
                'highlight' => number_format($limit).'원 초과',
            ];
        }

        return [
            'cards' => $cards,
            'check_points' => $checkPoints,
        ];
    }

    /**
     * 복리후생비 현황
     */
    protected function getWelfare(int $year, int $month): array
    {
        $tenantId = $this->tenantId();

        // 실제로는 expense_category 등으로 복리후생비 분류 필요
        $monthlyTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->whereIn('transaction_type', ['salary', 'insurance'])
            ->sum('amount');

        $salaryTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->where('transaction_type', 'salary')
            ->sum('amount');

        $insuranceTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereMonth('expected_payment_date', $month)
            ->where('transaction_type', 'insurance')
            ->sum('amount');

        $yearlyTotal = ExpectedExpense::where('tenant_id', $tenantId)
            ->whereYear('expected_payment_date', $year)
            ->whereIn('transaction_type', ['salary', 'insurance'])
            ->sum('amount');

        $cards = [
            ['id' => 'wf-1', 'label' => '이번 달 복리후생비', 'amount' => (float) $monthlyTotal],
            ['id' => 'wf-2', 'label' => '급여 지출', 'amount' => (float) $salaryTotal],
            ['id' => 'wf-3', 'label' => '보험료 지출', 'amount' => (float) $insuranceTotal],
            ['id' => 'wf-4', 'label' => '연간 복리후생비 누계', 'amount' => (float) $yearlyTotal],
        ];

        $checkPoints = [];
        // 복리후생비 비율 경고 (예시)
        if ($monthlyTotal > 0 && $salaryTotal > 0) {
            $ratio = ($monthlyTotal / $salaryTotal) * 100;
            if ($ratio < 5 || $ratio > 20) {
                $checkPoints[] = [
                    'id' => 'wf-cp-1',
                    'type' => 'warning',
                    'message' => '복리후생비 비율이 정상 범위(5~20%)를 벗어났습니다.',
                ];
            }
        }

        return [
            'cards' => $cards,
            'check_points' => $checkPoints,
        ];
    }

    /**
     * 미수금 현황
     */
    protected function getReceivable(int $year, int $month): array
    {
        $tenantId = $this->tenantId();

        // 총 미수금 (거래처별)
        $totalReceivable = Client::where('tenant_id', $tenantId)
            ->where('is_active', true)
            ->sum('outstanding_balance');

        // 이번 달 입금
        $monthlyDeposit = Deposit::where('tenant_id', $tenantId)
            ->whereYear('deposit_date', $year)
            ->whereMonth('deposit_date', $month)
            ->sum('amount');

        // 오늘 입금
        $todayDeposit = Deposit::where('tenant_id', $tenantId)
            ->whereDate('deposit_date', Carbon::today())
            ->sum('amount');

        // 연체 미수금 (credit_limit 초과 거래처)
        $overdueReceivable = Client::where('tenant_id', $tenantId)
            ->where('is_active', true)
            ->whereColumn('outstanding_balance', '>', 'credit_limit')
            ->sum('outstanding_balance');

        $cards = [
            [
                'id' => 'rcv-1',
                'label' => '총 미수금',
                'amount' => (float) $totalReceivable,
                'sub_amount' => (float) $overdueReceivable,
                'sub_label' => '한도초과',
            ],
            [
                'id' => 'rcv-2',
                'label' => '이번 달 입금',
                'amount' => (float) $monthlyDeposit,
            ],
            [
                'id' => 'rcv-3',
                'label' => '오늘 입금',
                'amount' => (float) $todayDeposit,
            ],
            [
                'id' => 'rcv-4',
                'label' => '연체 미수금',
                'amount' => (float) $overdueReceivable,
            ],
        ];

        $checkPoints = [];

        // 한도 초과 거래처
        $overdueClients = Client::where('tenant_id', $tenantId)
            ->where('is_active', true)
            ->whereColumn('outstanding_balance', '>', 'credit_limit')
            ->select('name', 'outstanding_balance')
            ->limit(3)
            ->get();

        foreach ($overdueClients as $client) {
            $checkPoints[] = [
                'id' => 'rcv-cp-'.($client->id ?? uniqid()),
                'type' => 'error',
                'message' => $client->name.'의 미수금이 한도를 초과했습니다.',
                'highlight' => '거래 주의가 필요합니다.',
            ];
        }

        return [
            'cards' => $cards,
            'check_points' => $checkPoints,
            'has_detail_button' => true,
            'detail_button_label' => '거래처별 미수금 현황',
            'detail_button_path' => '/accounting/receivables-status',
        ];
    }

    /**
     * 채권추심 현황
     */
    protected function getDebtCollection(): array
    {
        $tenantId = $this->tenantId();

        // 추심중 건수 및 금액
        $collectingData = BadDebt::where('tenant_id', $tenantId)
            ->collecting()
            ->selectRaw('COUNT(*) as count, SUM(debt_amount) as total')
            ->first();

        // 법적조치 건수 및 금액
        $legalData = BadDebt::where('tenant_id', $tenantId)
            ->legalAction()
            ->selectRaw('COUNT(*) as count, SUM(debt_amount) as total')
            ->first();

        // 회수완료 금액 (이번 년도)
        $recoveredTotal = BadDebt::where('tenant_id', $tenantId)
            ->recovered()
            ->whereYear('closed_at', Carbon::now()->year)
            ->sum('debt_amount');

        // 대손처리 금액
        $badDebtTotal = BadDebt::where('tenant_id', $tenantId)
            ->badDebt()
            ->sum('debt_amount');

        $cards = [
            ['id' => 'debt-1', 'label' => '추심중', 'amount' => (float) ($collectingData->total ?? 0)],
            ['id' => 'debt-2', 'label' => '법적조치 진행', 'amount' => (float) ($legalData->total ?? 0)],
            ['id' => 'debt-3', 'label' => '올해 회수 완료', 'amount' => (float) $recoveredTotal],
            ['id' => 'debt-4', 'label' => '대손처리 금액', 'amount' => (float) $badDebtTotal],
        ];

        $checkPoints = [];
        $collectingCount = $collectingData->count ?? 0;
        $legalCount = $legalData->count ?? 0;

        if ($collectingCount > 0) {
            $checkPoints[] = [
                'id' => 'debt-cp-1',
                'type' => 'info',
                'message' => '현재 추심 진행 중인 건이 '.$collectingCount.'건 있습니다.',
            ];
        }
        if ($legalCount > 0) {
            $checkPoints[] = [
                'id' => 'debt-cp-2',
                'type' => 'warning',
                'message' => '법적조치 진행 중인 건이 '.$legalCount.'건 있습니다.',
            ];
        }

        return [
            'cards' => $cards,
            'check_points' => $checkPoints,
        ];
    }
}