package agentrecharge

import (
	"context"

	"github.com/break/junhong_cmp_fiber/pkg/constants"
	apperrors "github.com/break/junhong_cmp_fiber/pkg/errors"
)

// OnlinePaymentMethodConfigReader 提供代理在线自充允许范围的严格读取能力。
type OnlinePaymentMethodConfigReader interface {
	GetStrict(ctx context.Context, key string) (string, error)
}

// OnlinePaymentMethodPolicy 将受控配置值映射为对外可见的线上支付方式集合。
type OnlinePaymentMethodPolicy struct {
	reader OnlinePaymentMethodConfigReader
}

// NewOnlinePaymentMethodPolicy 创建代理在线自充允许范围策略。
func NewOnlinePaymentMethodPolicy(reader OnlinePaymentMethodConfigReader) *OnlinePaymentMethodPolicy {
	return &OnlinePaymentMethodPolicy{reader: reader}
}

// AllowedMethods 严格读取允许范围；配置缺失使用注册默认值，非法值失败关闭。
func (p *OnlinePaymentMethodPolicy) AllowedMethods(ctx context.Context) ([]string, error) {
	if p == nil || p.reader == nil {
		return nil, apperrors.New(apperrors.CodeServiceUnavailable, "代理在线充值允许范围未配置")
	}
	value, err := p.reader.GetStrict(ctx, constants.SystemConfigAgentSelfRechargeAllowedMethods)
	if err != nil {
		return nil, apperrors.Wrap(apperrors.CodeNoPaymentConfig, err, "读取代理在线充值允许范围失败")
	}
	switch value {
	case constants.AgentSelfRechargeAllowedWechatOnly:
		return []string{constants.RechargeMethodWechat}, nil
	case constants.AgentSelfRechargeAllowedAlipayOnly:
		return []string{constants.RechargeMethodAlipay}, nil
	case constants.AgentSelfRechargeAllowedBoth:
		return []string{constants.RechargeMethodWechat, constants.RechargeMethodAlipay}, nil
	default:
		return nil, apperrors.New(apperrors.CodeNoPaymentConfig, "代理在线充值允许范围值非法")
	}
}

// IsAllowed 判断业务支付方式是否在当前受控允许范围内。
func (p *OnlinePaymentMethodPolicy) IsAllowed(ctx context.Context, method string) error {
	methods, err := p.AllowedMethods(ctx)
	if err != nil {
		return err
	}
	for _, allowed := range methods {
		if allowed == method {
			return nil
		}
	}
	return apperrors.New(apperrors.CodeNoPaymentConfig, "当前支付方式不在代理在线充值允许范围内")
}