<?php

namespace plugin\saiadmin\app\service;

use DateTimeImmutable;

/** Statistics::business_device_data 的经营口径；未知成本/有效分成不按零处理。 */
class DeviceOperationMetrics
{
    public static function calculate(array $row, array $daily, DateTimeImmutable $now): array
    {
        $amount = (float) $row['total_amount'];
        $today = (float) $row['today_amount'];
        $yesterday = (float) $row['yesterday_amount'];
        $rate = isset($row['merchant_rate']) ? (float) $row['merchant_rate'] : null;
        $managerRate = isset($row['manager_rate']) ? (float) $row['manager_rate'] : null;
        $cost = isset($row['cost_price']) ? (float) $row['cost_price'] : null;
        $started = empty($row['bind_time']) ? null : new DateTimeImmutable($row['bind_time']);
        $days = $started && $started <= $now
            ? (int) $started->setTime(0, 0)->diff($now->setTime(0, 0))->days + 1 : 0;
        $average = $days > 0 ? $amount / $days : null;
        $performance = self::performance($yesterday, $average ?? 0.0);
        $recovery = self::recovery($cost, $managerRate, $started, $days, $daily);

        return array_merge($row, [
            'id' => (int) $row['id'],
            'goods_type' => (int) $row['goods_type'],
            'manage_agent_id' => (int) $row['manage_agent_id'],
            'merchant_id' => (int) ($row['merchant_id'] ?? 0),
            'total_amount' => round($amount, 2),
            'today_amount' => round($today, 2),
            'yesterday_amount' => round($yesterday, 2),
            'total_orders' => (int) $row['total_orders'],
            'today_orders' => (int) $row['today_orders'],
            'yesterday_orders' => (int) $row['yesterday_orders'],
            'paid_orders' => (int) $row['paid_orders'],
            'unit_price' => (int) $row['paid_orders'] > 0 ? round($amount / (int) $row['paid_orders'], 4) : 0,
            'merchant_rate' => $rate,
            'manager_rate' => $managerRate,
            'cost_price' => $cost,
            'total_profit' => self::profit($amount, $rate),
            'today_profit' => self::profit($today, $rate),
            'yesterday_profit' => self::profit($yesterday, $rate),
            // 旧页面“盈利率”实际为净交易额 / 成本，并非利润率。
            'profit_rate_value' => $cost !== null && $cost > 0 ? round($amount / $cost * 100, 4) : null,
            'daily_growth' => $yesterday > 0 ? round(($today - $yesterday) / $yesterday * 100, 2) : null,
            'operated_days' => $days,
            'daily_average_amount' => $average === null ? null : round($average, 4),
        ], $recovery, $performance);
    }

    private static function profit(float $amount, ?float $rate): ?float
    {
        // 无交易额即可确定收益为 0；有交易额但缺分成时保持未知。
        if ($amount === 0.0) {
            return 0.0;
        }
        return $rate === null ? null : round($amount * $rate / 100, 4);
    }

    private static function performance(float $yesterday, float $average): array
    {
        $score = $average > 0 ? $yesterday / $average : 0;
        $labels = ['最差', '差', '一般', '中等', '好', '良', '优良', '优秀'];
        $grade = 7;
        foreach ([0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2] as $index => $threshold) {
            if ($score <= $threshold) {
                $grade = $index;
                break;
            }
        }
        return ['performance_grade' => $grade, 'today_performance' => $labels[$grade]];
    }

    /** 按日期正序找首次回本日，收入查询已排除本次铺货之前的订单。 */
    private static function recovery(?float $cost, ?float $rate, ?DateTimeImmutable $started, int $days, array $daily): array
    {
        $result = ['is_cost_recovery' => null, 'cost_recovery_date' => null, 'cost_recovery_days' => null];
        if ($cost === null || $rate === null || $started === null || $days <= 0) {
            return $result;
        }
        $result['is_cost_recovery'] = false;
        $recoveryDate = $cost === 0.0 ? $started->format('Y-m-d') : null;
        $cumulative = 0.0;
        foreach ($daily as $day) {
            if ($recoveryDate !== null) {
                break;
            }
            if ($day['stat_date'] < $started->format('Y-m-d')) {
                continue;
            }
            $cumulative += (float) $day['amount'] * $rate / 100;
            if (round($cumulative, 4) >= $cost) {
                $recoveryDate = $day['stat_date'];
            }
        }
        if ($recoveryDate !== null) {
            $result['is_cost_recovery'] = true;
            $result['cost_recovery_date'] = $recoveryDate;
            $result['cost_recovery_days'] = (int) $started->setTime(0, 0)->diff(new DateTimeImmutable($recoveryDate))->days + 1;
        }
        return $result;
    }
}