<?php

namespace addons\shopro\tests;

/**
 * 分销佣金预期计算器（与 Commission.php 算法一致，用于测试对照）
 */
class CommissionScenarioCalculator
{
    /**
     * @param array $options
     *  - amount float 结算金额
     *  - commission_level int 分销层级 1-3
     *  - chain array 上级链（从直推起）每项: name, agent_level, commission_1/2/3, differential_amount, management_rate
     *  - self_buy bool 是否自购
     *  - buyer_name string 买家代号（自购时用于跳过级差）
     *  - is_repurchase bool 是否复购
     *  - chain_enable / differential_enable / management_enable / repurchase_self_enable / repurchase_referrer_enable
     *  - repurchase_rate float 复购一级关系链比例(%)，级差模式下无效
     *  - differential_mode bool 是否级差模式（级差模式下 repurchase_rate 不覆盖一级佣金）
     *  - repurchase_self_type fixed|rate
     *  - repurchase_self_amount / repurchase_self_rate
     */
    public static function calculate(array $options)
    {
        $amount = floatval($options['amount'] ?? 0);
        $commissionLevel = intval($options['commission_level'] ?? 3);
        $chain = $options['chain'] ?? [];
        $selfBuy = !empty($options['self_buy']);
        $buyerName = $options['buyer_name'] ?? 'Buyer';
        $isRepurchase = !empty($options['is_repurchase']);

        $chainEnable = array_key_exists('chain_enable', $options) ? (bool) $options['chain_enable'] : true;
        $differentialEnable = array_key_exists('differential_enable', $options) ? (bool) $options['differential_enable'] : true;
        $managementEnable = array_key_exists('management_enable', $options) ? (bool) $options['management_enable'] : true;
        $repurchaseSelfEnable = array_key_exists('repurchase_self_enable', $options) ? (bool) $options['repurchase_self_enable'] : true;
        $repurchaseReferrerEnable = array_key_exists('repurchase_referrer_enable', $options) ? (bool) $options['repurchase_referrer_enable'] : true;
        $productRepurchaseEnable = array_key_exists('product_repurchase_enable', $options) ? (bool) $options['product_repurchase_enable'] : true;

        $repurchaseRate = floatval($options['repurchase_rate'] ?? 0);
        $differentialMode = !empty($options['differential_mode']);
        $repurchaseSelfType = $options['repurchase_self_type'] ?? 'fixed';
        $repurchaseSelfAmount = floatval($options['repurchase_self_amount'] ?? 5);
        $repurchaseSelfRate = floatval($options['repurchase_self_rate'] ?? 3);

        $rewards = [];
        $skipReferrer = $isRepurchase && !$repurchaseReferrerEnable;

        if (!$skipReferrer) {
            if ($chainEnable) {
                $rewards = array_merge($rewards, self::calcChain(
                    $chain,
                    $amount,
                    $commissionLevel,
                    $isRepurchase,
                    $repurchaseRate,
                    $differentialMode
                ));
            }
            if ($differentialEnable) {
                $rewards = array_merge($rewards, self::calcDifferential(
                    $chain,
                    $selfBuy,
                    $buyerName
                ));
            }
            if ($managementEnable) {
                $rewards = array_merge($rewards, self::calcManagement(
                    $chain,
                    $amount
                ));
            }
        }

        // 复购已优化为付款时直接减免，分销模块不再向买家发放事后返现佣金
        // if ($isRepurchase && $repurchaseSelfEnable && $productRepurchaseEnable) { ... }

        $total = 0;
        foreach ($rewards as $row) {
            $total += floatval($row['commission']);
        }

        return [
            'rewards' => $rewards,
            'total' => round($total, 2),
        ];
    }

    protected static function calcChain($chain, $amount, $commissionLevel, $isRepurchase, $repurchaseRate, $differentialMode = false)
    {
        $rewards = [];
        $depth = 1;
        foreach ($chain as $node) {
            if ($depth > $commissionLevel) {
                break;
            }
            $rateKey = 'commission_' . $depth;
            $rate = floatval($node[$rateKey] ?? 0);
            if ($depth === 1 && $isRepurchase && $repurchaseRate > 0 && !$differentialMode && $rate > 0) {
                $rate = $repurchaseRate;
            }
            if ($rate > 0) {
                $rewards[] = [
                    'name' => $node['name'],
                    'award_type' => 'chain',
                    'commission_level' => $depth,
                    'commission' => round($amount * $rate * 0.01, 2),
                    'rate' => $rate,
                ];
            }
            $depth++;
        }
        return $rewards;
    }

    protected static function calcDifferential($chain, $selfBuy, $buyerName)
    {
        $rewards = [];
        $prevTier = 0;

        if ($selfBuy && !empty($chain)) {
            $buyerNode = null;
            foreach ($chain as $node) {
                if ($node['name'] === $buyerName) {
                    $buyerNode = $node;
                    break;
                }
            }
            if ($buyerNode) {
                $prevTier = floatval($buyerNode['differential_amount'] ?? 0);
            }
        }

        $depth = 1;
        foreach ($chain as $node) {
            if ($selfBuy && $node['name'] === $buyerName) {
                $depth++;
                continue;
            }
            $tier = floatval($node['differential_amount'] ?? 0);
            $payout = round(max(0, $tier - $prevTier), 2);
            $prevTier = max($prevTier, $tier);
            if ($payout > 0) {
                $rewards[] = [
                    'name' => $node['name'],
                    'award_type' => 'differential',
                    'commission_level' => $depth,
                    'commission' => $payout,
                    'tier' => $tier,
                ];
            }
            $depth++;
        }
        return $rewards;
    }

    protected static function calcManagement($chain, $amount)
    {
        $rewards = [];
        $depth = 1;
        foreach ($chain as $node) {
            $rate = floatval($node['management_rate'] ?? 0);
            if ($rate > 0) {
                $rewards[] = [
                    'name' => $node['name'],
                    'award_type' => 'management',
                    'commission_level' => $depth,
                    'commission' => round($amount * $rate * 0.01, 2),
                    'rate' => $rate,
                ];
            }
            $depth++;
        }
        return $rewards;
    }

    /** 内置三个标准测试场景 */
    public static function builtInScenarios()
    {
        $levels = [
            'L1' => ['commission_1' => 10, 'commission_2' => 0, 'commission_3' => 0, 'differential_amount' => 40, 'management_rate' => 5],
            'L2' => ['commission_1' => 10, 'commission_2' => 5, 'commission_3' => 0, 'differential_amount' => 80, 'management_rate' => 3],
            'L3' => ['commission_1' => 10, 'commission_2' => 5, 'commission_3' => 3, 'differential_amount' => 120, 'management_rate' => 2],
        ];

        $chainNormal = [
            array_merge(['name' => 'C(直推)'], $levels['L1']),
            array_merge(['name' => 'B(二级)'], $levels['L2']),
            array_merge(['name' => 'A(三级)'], $levels['L3']),
        ];

        $chainSelfBuy = [
            array_merge(['name' => 'C(自购)'], $levels['L1']),
            array_merge(['name' => 'B(二级)'], $levels['L2']),
            array_merge(['name' => 'A(三级)'], $levels['L3']),
        ];

        return [
            'scenario_1' => [
                'title' => '场景1：首购 · 买家D · 上级C→B→A · 订单1000元 · 三类全开',
                'steps' => [
                    '1. 确认分销设置：关系链/级差/管理奖/本人复购返现 均开启',
                    '2. 确认等级：L1档40元/5%，L2档80元/3%，L3档120元/2%；关系链 10%/5%/3%',
                    '3. 分销商品勾选：参与分销 + 级差 + 管理奖 + 复购返现',
                    '4. 建立关系：A→B→C→D（D 为普通买家或分销商均可）',
                    '5. D 首次下单 1000 元并支付（结算基数=商品价 1000）',
                    '6. 查表：SELECT * FROM fa_shopro_commission_reward WHERE order_item_id=订单明细ID',
                ],
                'options' => [
                    'amount' => 1000,
                    'commission_level' => 3,
                    'chain' => $chainNormal,
                    'buyer_name' => 'D(买家)',
                    'self_buy' => false,
                    'is_repurchase' => false,
                ],
            ],
            'scenario_2' => [
                'title' => '场景2：自购 · 分销商C自买1000元 · 上级B→A · 内购开启',
                'steps' => [
                    '1. 分销设置开启「分销内购」',
                    '2. C 为 L1 分销商，上级 B(L2)、A(L3)',
                    '3. C 自己下单 1000 元并支付',
                    '4. 级差应跳过 C 本人，从 C 的档位 40 作为 prevTier',
                    '5. 管理奖 C 本人也应获得 5%',
                ],
                'options' => [
                    'amount' => 1000,
                    'commission_level' => 3,
                    'chain' => $chainSelfBuy,
                    'buyer_name' => 'C(自购)',
                    'self_buy' => true,
                    'is_repurchase' => false,
                ],
            ],
            'scenario_3' => [
                'title' => '场景3：复购 · D 第二次购买1000元 · 付款时已立减5元（不返现）',
                'steps' => [
                    '1. D 历史已有至少一笔包含该指定商品的有效订单 (status in 1,2)',
                    '2. 复购推荐人分佣=继续分佣；本人复购立减=开启，类型=固定5元',
                    '3. 商品勾选参与复购立减',
                    '4. D 再次下单时直接立减 5 元，实付 995 元',
                    '5. 推荐人仍拿关系链+级差+管理奖；D 本人付款立减，不再产生返现佣金',
                ],
                'options' => [
                    'amount' => 1000,
                    'commission_level' => 3,
                    'chain' => $chainNormal,
                    'buyer_name' => 'D(买家)',
                    'self_buy' => false,
                    'is_repurchase' => true,
                    'repurchase_self_type' => 'fixed',
                    'repurchase_self_amount' => 5,
                ],
            ],
            'scenario_4' => [
                'title' => '场景4：复购 · 推荐人不再分佣 · 买家付款立减5元（佣金奖池为0）',
                'steps' => [
                    '1. 分销设置：复购推荐人分佣=不再分佣',
                    '2. D 复购付款时已直接立减 5 元',
                    '3. 预期：C/B/A 无分销佣金，买家已立减亦无返现佣金，总佣金为 0',
                ],
                'options' => [
                    'amount' => 1000,
                    'commission_level' => 3,
                    'chain' => $chainNormal,
                    'buyer_name' => 'D(买家)',
                    'self_buy' => false,
                    'is_repurchase' => true,
                    'repurchase_referrer_enable' => false,
                    'repurchase_self_type' => 'fixed',
                    'repurchase_self_amount' => 5,
                ],
            ],
        ];
    }
}