<?php

namespace App\Http\Controllers\Api;

use App\Admin\Filters\LedgerFilter;
use App\Admin\Filters\StoreFilter;
use App\Http\Resources\StoreResource;
use App\Models\Ledger;
use App\Models\Store;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

class StatisticsController extends Controller
{
    /**
     * 首页统计
     */
    public function dashboard(Request $request): array
    {
        $query = Ledger::filter(
            $this->defaultFilterInput($request), LedgerFilter::class
        );

        // 昨天
        $yesterday = Carbon::yesterday();

        //--------------------------------------------------------------------------
        // 本月总账录入
        //--------------------------------------------------------------------------
        $currentMonthLedger = (clone $query)
            ->select([DB::raw('SUM(sales) as sales'), DB::raw('SUM(expenditure) as expenditure')])
            ->whereBetween('date', [$yesterday->copy()->startOfMonth()->format('Y-m-d'), $yesterday->format('Y-m-d')])
            ->first();

        //--------------------------------------------------------------------------
        // 昨日总账录入
        //--------------------------------------------------------------------------
        $yesterdayLedger = (clone $query)->where('date', $yesterday->format('Y-m-d'))->first();

        //--------------------------------------------------------------------------
        // 近 30 天趋势数据
        //--------------------------------------------------------------------------
        $start = $yesterday->copy()->subDays(29);
        $end = $yesterday->copy();
        /** @var \Illuminate\Database\Eloquent\Collection */
        $ledgers30days = (clone $query)
            ->whereBetween('date', [$start, $end])
            ->get(['date', 'sales', 'expenditure'])
            ->keyBy('date');

        return [
            // 本月总账录入
            'current_month_ledger' => [
                // 截止日期
                'deadline' => $yesterday->format('Y-m-d'),
                'sales' => trim_zeros($currentMonthLedger->sales ?? 0),
                'expenditure' => trim_zeros($currentMonthLedger->expenditure ?? 0),
            ],
            // 昨日累计金额
            'yesterday_ledger' => [
                'date' => $yesterday->format('Y-m-d'),
                'sales' => trim_zeros($yesterdayLedger->sales ?? 0),
                'expenditure' => trim_zeros($yesterdayLedger->expenditure ?? 0),
            ],
            // 近30天趋势数据
            'trend_data_of_30days' => $this->prepareTrendData($start->copy(), $end->copy(), $ledgers30days),
        ];
    }

    /**
     * 门店统计
     */
    public function stores(Request $request)
    {
        $request->validate(
            rules: [
                'start_at' => ['bail', 'required', 'date_format:Y-m-d'],
                'end_at' => ['bail', 'required', 'date_format:Y-m-d'],
            ],
            attributes: [
                'start_at' => '开始日期',
                'end_at' => '结束日期',
            ],
        );

        $storeLedgerStats = Ledger::select(['store_id', DB::raw('SUM(sales) as sales')])
            ->whereBetween('date', [$request->input('start_at'), $request->input('end_at')])
            ->groupBy('store_id');

        $stores = Store::filter($this->defaultFilterInput($request), StoreFilter::class)
            ->leftJoinSub($storeLedgerStats, 'store_ledger_stats', fn ($join) => $join->on('stores.id', '=', 'store_ledger_stats.store_id'))
            ->orderBy('sales', 'desc')
            ->orderBy('id', 'asc')
            ->get();

        return $stores->map(function (Store $store) {
            return [
                'store' => StoreResource::make($store),
                'sales' => trim_zeros($store->sales ?: 0),
            ];
        });
    }

    /**
     * 准备趋势数据
     */
    protected function prepareTrendData(Carbon $start, Carbon $end, Collection $ledgers): array
    {
        $data = collect();

        do {
            $ledger = $ledgers->get(
                $date = $start->format('Y-m-d')
            );

            $data->push([
                'date' => $date,
                'sales' => trim_zeros($ledger->sales ?? 0),
                'expenditure' => trim_zeros($ledger->expenditure ?? 0),
            ]);

            $start->addDay();
        } while ($start->lte($end));

        return $data->all();
    }

    /**
     * 处理区域和门店过滤条件
     */
    protected function defaultFilterInput(Request $request): array
    {
        $input = [];

        if ($request->filled('store_id')) {
            $input['store_id'] = $request->input('store_id');
        } else {
            $region = [];

            if ($request->filled('province_code')) {
                $region['provinceCode'] = $request->input('province_code');
            }

            if ($request->filled('city_code')) {
                $region['cityCode'] = $request->input('city_code');
            }

            $input['region'] = $region;
        }

        return $input;
    }
}