<?php

namespace App\Http\Controllers\Api;

use App\Models\Ledger;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

class StatsController extends Controller
{
    public function dashboard(Request $request)
    {
        /** @var \App\Models\Employee */
        $user = $request->user();

        $query = Ledger::when($user->isAdministrator(), function ($query) use ($request) {
            if ($request->filled('store_id')) {
                return $query->where('store_id', $request->input('store_id'));
            }

            if (! $request->anyFilled(['province_code', 'city_code'])) {
                return;
            }

            $query->whereHas('store', function ($query) use ($request) {
                $request->whenFilled('province_code', fn ($code) => $query->where('region->provinceCode', $code));
                $request->whenFilled('city_code', fn ($code) => $query->where('region->cityCode', $code));
            });
        }, fn ($query) => $query->where('store_id', $user->store_id));

        // 今天
        $today = Carbon::today();

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

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

        //--------------------------------------------------------------------------
        // 近 30 天趋势数据
        //--------------------------------------------------------------------------
        $start = $today->copy()->subDays(30);
        $end = $start->copy()->addDays(29);
        /** @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' => $today->format('Y-m-d'),
                'sales' => trim_zeros($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),
        ];
    }

    public function test(Request $request)
    {
        /** @var \App\Models\Employee */
        $user = $request->user();
    }

    /**
     * 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();
    }
}