<?php

namespace App\Module\Transfer\Events;

use App\Module\Transfer\Models\TransferApp;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Queue\SerializesModels;

/**
 * 手续费计算事件
 *
 * 在计算手续费时触发，允许其他模块修改手续费数额
 */
class FeeCalculatingEvent
{
    use Dispatchable, SerializesModels;

    /**
     * 划转应用
     */
    public TransferApp $app;

    /**
     * 原始金额
     */
    public string $amount;

    /**
     * 手续费类型：'in' 或 'out'
     */
    public string $type;

    /**
     * 计算出的手续费金额
     */
    public string $feeAmount;


    /**
     * 是否被修改过
     */
    public bool $isModified = false;

    /**
     * 修改原因（用于日志记录）
     */
    public ?string $modificationReason = null;

    /**
     * 修改者标识（模块名或服务名）
     */
    public ?string $modifiedBy = null;

    /**
     * 额外的上下文数据
     */
    public array $context = [];

    /**
     * 创建事件实例
     *
     * @param TransferApp $app 划转应用
     * @param string $amount 原始金额
     * @param string $type 手续费类型
     * @param string $feeAmount 手续费金额
     * @param array $context 额外的上下文数据
     */
    public function __construct(
        TransferApp $app,
        string $amount,
        string $type,

        string $feeAmount,

        array $context = []
    ) {
        $this->app = $app;
        $this->amount = $amount;
        $this->type = $type;
        $this->feeAmount = $feeAmount;
        $this->context = $context;
    }

    /**
     * 修改手续费金额
     *
     * @param string $newFeeAmount 新的手续费金额
     * @param string $reason 修改原因
     * @param string $modifiedBy 修改者标识
     * @return void
     */
    public function modifyFeeAmount(string $newFeeAmount, string $reason, string $modifiedBy): void
    {
        $this->feeAmount = $newFeeAmount;

        $this->isModified = true;
        $this->modificationReason = $reason;
        $this->modifiedBy = $modifiedBy;
    }

    /**
     * 修改手续费率（会重新计算手续费金额）
     *
     * @param float $newFeeRate 新的手续费率
     * @param string $reason 修改原因
     * @param string $modifiedBy 修改者标识
     * @return void
     */
    public function modifyFeeRate(float $newFeeRate, string $reason, string $modifiedBy): void
    {
        $this->feeAmount = bcmul($this->amount, (string)$newFeeRate, 4);
        $this->isModified = true;
        $this->modificationReason = $reason;
        $this->modifiedBy = $modifiedBy;
    }

    /**
     * 设置免手续费
     *
     * @param string $reason 免费原因
     * @param string $modifiedBy 修改者标识
     * @return void
     */
    public function setFree(string $reason, string $modifiedBy): void
    {

        $this->feeAmount = '0.0000';

        $this->isModified = true;
        $this->modificationReason = $reason;
        $this->modifiedBy = $modifiedBy;
    }

    /**
     * 增加手续费金额
     *
     * @param string $additionalFee 额外手续费
     * @param string $reason 增加原因
     * @param string $modifiedBy 修改者标识
     * @return void
     */
    public function addFee(string $additionalFee, string $reason, string $modifiedBy): void
    {
        $this->feeAmount = bcadd($this->feeAmount, $additionalFee, 4);

        $this->isModified = true;
        $this->modificationReason = $reason;
        $this->modifiedBy = $modifiedBy;
    }

    /**
     * 减少手续费金额
     *
     * @param string $discountFee 减免手续费
     * @param string $reason 减免原因
     * @param string $modifiedBy 修改者标识
     * @return void
     */
    public function reduceFee(string $discountFee, string $reason, string $modifiedBy): void
    {
        $newFeeAmount = bcsub($this->feeAmount, $discountFee, 4);

        // 确保手续费不为负数
        if (bccomp($newFeeAmount, '0', 4) < 0) {
            $newFeeAmount = '0.0000';
        }

        $this->feeAmount = $newFeeAmount;

        $this->isModified = true;
        $this->modificationReason = $reason;
        $this->modifiedBy = $modifiedBy;
    }

    /**
     * 获取手续费计算结果
     *
     * @return array
     */
    public function getResult(): array
    {
        return [

            'fee_amount' => $this->feeAmount,

            'is_modified' => $this->isModified,
            'modification_reason' => $this->modificationReason,
            'modified_by' => $this->modifiedBy,
        ];
    }

    /**
     * 获取上下文数据
     *
     * @param string $key 键名
     * @param mixed $default 默认值
     * @return mixed
     */
    public function getContext(string $key, $default = null)
    {
        return $this->context[$key] ?? $default;
    }

    /**
     * 设置上下文数据
     *
     * @param string $key 键名
     * @param mixed $value 值
     * @return void
     */
    public function setContext(string $key, $value): void
    {
        $this->context[$key] = $value;
    }

    /**
     * 检查是否为转入手续费
     *
     * @return bool
     */
    public function isTransferIn(): bool
    {
        return $this->type === 'in';
    }

    /**
     * 检查是否为转出手续费
     *
     * @return bool
     */
    public function isTransferOut(): bool
    {
        return $this->type === 'out';
    }
}