<?php

namespace App\Controllers\Admin;

use App\Controllers\BaseController;
use App\Models\BagSaleModel;
use App\Models\BagIssueModel;
use App\Models\BagReceivingModel;
use App\Models\BagInventoryModel;

class SalesReport extends BaseController
{
    /**
     * P5-01: 판매 대장 (일자별/기간별)
     */
    public function salesLedger()
    {
        helper('admin');
        $lgIdx = admin_effective_lg_idx();
        if (!$lgIdx) return redirect()->to(site_url('admin'))->with('error', '지자체를 선택해 주세요.');

        $startDate = $this->request->getGet('start_date') ?? date('Y-m-01');
        $endDate   = $this->request->getGet('end_date') ?? date('Y-m-d');
        $mode      = $this->request->getGet('mode') ?? 'daily'; // daily or period

        $saleModel = model(BagSaleModel::class);
        $db = \Config\Database::connect();

        if ($mode === 'daily') {
            $result = $db->query("
                SELECT bs_sale_date, bs_ds_name, bs_bag_code, bs_bag_name, bs_type,
                       SUM(ABS(bs_qty)) as total_qty,
                       SUM(bs_amount) as total_amount
                FROM bag_sale
                WHERE bs_lg_idx = ? AND bs_sale_date BETWEEN ? AND ? AND bs_type IN('sale','return')
                GROUP BY bs_sale_date, bs_ds_name, bs_bag_code, bs_bag_name, bs_type
                ORDER BY bs_sale_date DESC, bs_ds_name, bs_bag_code
            ", [$lgIdx, $startDate, $endDate])->getResult();
        } else {
            $result = $db->query("
                SELECT bs_ds_name, bs_bag_code, bs_bag_name,
                       SUM(CASE WHEN bs_type='sale' THEN ABS(bs_qty) ELSE 0 END) as sale_qty,
                       SUM(CASE WHEN bs_type='sale' THEN bs_amount ELSE 0 END) as sale_amount,
                       SUM(CASE WHEN bs_type='return' THEN ABS(bs_qty) ELSE 0 END) as return_qty,
                       SUM(CASE WHEN bs_type='return' THEN bs_amount ELSE 0 END) as return_amount
                FROM bag_sale
                WHERE bs_lg_idx = ? AND bs_sale_date BETWEEN ? AND ?
                GROUP BY bs_ds_name, bs_bag_code, bs_bag_name
                ORDER BY bs_ds_name, bs_bag_code
            ", [$lgIdx, $startDate, $endDate])->getResult();
        }

        return view('admin/layout', [
            'title'   => '판매 대장',
            'content' => view('admin/sales_report/sales_ledger', compact('result', 'startDate', 'endDate', 'mode')),
        ]);
    }

    /**
     * P5-02: 일계표
     */
    public function dailySummary()
    {
        helper('admin');
        $lgIdx = admin_effective_lg_idx();
        if (!$lgIdx) return redirect()->to(site_url('admin'))->with('error', '지자체를 선택해 주세요.');

        $date = $this->request->getGet('date') ?? date('Y-m-d');
        $db = \Config\Database::connect();

        // 당일 판매
        $daily = $db->query("
            SELECT bs_bag_code, bs_bag_name,
                   SUM(CASE WHEN bs_type='sale' THEN ABS(bs_qty) ELSE 0 END) as sale_qty,
                   SUM(CASE WHEN bs_type='sale' THEN bs_amount ELSE 0 END) as sale_amount
            FROM bag_sale
            WHERE bs_lg_idx = ? AND bs_sale_date = ?
            GROUP BY bs_bag_code, bs_bag_name
            ORDER BY bs_bag_code
        ", [$lgIdx, $date])->getResult();

        // 당월 누계
        $monthStart = date('Y-m-01', strtotime($date));
        $monthly = $db->query("
            SELECT bs_bag_code, bs_bag_name,
                   SUM(CASE WHEN bs_type='sale' THEN ABS(bs_qty) ELSE 0 END) as sale_qty,
                   SUM(CASE WHEN bs_type='sale' THEN bs_amount ELSE 0 END) as sale_amount
            FROM bag_sale
            WHERE bs_lg_idx = ? AND bs_sale_date BETWEEN ? AND ?
            GROUP BY bs_bag_code, bs_bag_name
            ORDER BY bs_bag_code
        ", [$lgIdx, $monthStart, $date])->getResult();

        return view('admin/layout', [
            'title'   => '일계표',
            'content' => view('admin/sales_report/daily_summary', compact('daily', 'monthly', 'date')),
        ]);
    }

    /**
     * P5-03: 기간별 판매현황
     */
    public function periodSales()
    {
        helper('admin');
        $lgIdx = admin_effective_lg_idx();
        if (!$lgIdx) return redirect()->to(site_url('admin'))->with('error', '지자체를 선택해 주세요.');

        $startDate = $this->request->getGet('start_date') ?? date('Y-m-01');
        $endDate   = $this->request->getGet('end_date') ?? date('Y-m-d');
        $db = \Config\Database::connect();

        $result = $db->query("
            SELECT bs_bag_code, bs_bag_name,
                   SUM(CASE WHEN bs_type='sale' THEN ABS(bs_qty) ELSE 0 END) as sale_qty,
                   SUM(CASE WHEN bs_type='sale' THEN bs_amount ELSE 0 END) as sale_amount,
                   SUM(CASE WHEN bs_type='return' THEN ABS(bs_qty) ELSE 0 END) as return_qty,
                   SUM(CASE WHEN bs_type='return' THEN bs_amount ELSE 0 END) as return_amount
            FROM bag_sale
            WHERE bs_lg_idx = ? AND bs_sale_date BETWEEN ? AND ?
            GROUP BY bs_bag_code, bs_bag_name
            ORDER BY bs_bag_code
        ", [$lgIdx, $startDate, $endDate])->getResult();

        return view('admin/layout', [
            'title'   => '기간별 판매현황',
            'content' => view('admin/sales_report/period_sales', compact('result', 'startDate', 'endDate')),
        ]);
    }

    /**
     * P5-07: 봉투 수불 현황
     */
    public function supplyDemand()
    {
        helper('admin');
        $lgIdx = admin_effective_lg_idx();
        if (!$lgIdx) return redirect()->to(site_url('admin'))->with('error', '지자체를 선택해 주세요.');

        $startDate = $this->request->getGet('start_date') ?? date('Y-m-01');
        $endDate   = $this->request->getGet('end_date') ?? date('Y-m-d');
        $db = \Config\Database::connect();

        // 입고 합계
        $receiving = $db->query("
            SELECT br_bag_code, br_bag_name,
                   SUM(br_qty_sheet) as recv_qty
            FROM bag_receiving
            WHERE br_lg_idx = ? AND br_receive_date BETWEEN ? AND ?
            GROUP BY br_bag_code, br_bag_name
        ", [$lgIdx, $startDate, $endDate])->getResult();

        // 판매 합계
        $sales = $db->query("
            SELECT bs_bag_code, bs_bag_name,
                   SUM(CASE WHEN bs_type='sale' THEN ABS(bs_qty) ELSE 0 END) as sale_qty,
                   SUM(CASE WHEN bs_type='return' THEN ABS(bs_qty) ELSE 0 END) as return_qty
            FROM bag_sale
            WHERE bs_lg_idx = ? AND bs_sale_date BETWEEN ? AND ?
            GROUP BY bs_bag_code, bs_bag_name
        ", [$lgIdx, $startDate, $endDate])->getResult();

        // 불출 합계
        $issues = $db->query("
            SELECT bi2_bag_code, bi2_bag_name,
                   SUM(bi2_qty) as issue_qty
            FROM bag_issue
            WHERE bi2_lg_idx = ? AND bi2_issue_date BETWEEN ? AND ? AND bi2_status = 'normal'
            GROUP BY bi2_bag_code, bi2_bag_name
        ", [$lgIdx, $startDate, $endDate])->getResult();

        // 현재 재고
        $inventory = model(BagInventoryModel::class)->where('bi_lg_idx', $lgIdx)->findAll();

        return view('admin/layout', [
            'title'   => '봉투 수불 현황',
            'content' => view('admin/sales_report/supply_demand', compact('receiving', 'sales', 'issues', 'inventory', 'startDate', 'endDate')),
        ]);
    }
}