package agent

import (
	"context"
	"encoding/hex"
	"encoding/json"
	"strconv"
	"ycc-server/app/main/model"
	"ycc-server/common/ctxdata"
	"ycc-server/common/globalkey"
	"ycc-server/common/xerr"
	"ycc-server/pkg/lzkit/crypto"

	"github.com/Masterminds/squirrel"
	"github.com/pkg/errors"

	"ycc-server/app/main/api/internal/svc"
	"ycc-server/app/main/api/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type GeneratingLinkLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewGeneratingLinkLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GeneratingLinkLogic {
	return &GeneratingLinkLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *GeneratingLinkLogic) GeneratingLink(req *types.AgentGeneratingLinkReq) (resp *types.AgentGeneratingLinkResp, err error) {
	userID, err := ctxdata.GetUidFromCtx(l.ctx)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "生成推广链接失败, %v", err)
	}

	// 1. 获取代理信息
	agentModel, err := l.svcCtx.AgentModel.FindOneByUserId(l.ctx, userID)
	if err != nil {
		if errors.Is(err, model.ErrNotFound) {
			return nil, errors.Wrapf(xerr.NewErrMsg("您不是代理"), "")
		}
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "查询代理信息失败, %v", err)
	}

	// 2. 获取系统配置
	basePrice, err := l.getConfigFloat("base_price")
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "获取基础底价配置失败, %v", err)
	}
	systemMaxPrice, err := l.getConfigFloat("system_max_price")
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "获取系统价格上限配置失败, %v", err)
	}

	// 4. 计算实际底价（基础底价 + 等级加成）
	levelBonus := l.getLevelBonus(agentModel.Level)
	actualBasePrice := basePrice + float64(levelBonus)

	// 5. 验证设定价格范围
	if req.SetPrice < actualBasePrice || req.SetPrice > systemMaxPrice {
		return nil, errors.Wrapf(xerr.NewErrMsg("设定价格必须在 %.2f 到 %.2f 之间"), "设定价格必须在 %.2f 到 %.2f 之间", actualBasePrice, systemMaxPrice)
	}

	// 6. 检查是否已存在相同的链接（同一代理、同一产品、同一价格）
	builder := l.svcCtx.AgentLinkModel.SelectBuilder().Where(squirrel.And{
		squirrel.Eq{"agent_id": agentModel.Id},
		squirrel.Eq{"product_id": req.ProductId},
		squirrel.Eq{"set_price": req.SetPrice},
		squirrel.Eq{"del_state": globalkey.DelStateNo},
	})

	existingLinks, err := l.svcCtx.AgentLinkModel.FindAll(l.ctx, builder, "")
	if err != nil && !errors.Is(err, model.ErrNotFound) {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "查询推广链接失败, %v", err)
	}

	if len(existingLinks) > 0 {
		// 已存在，直接返回
		return &types.AgentGeneratingLinkResp{
			LinkIdentifier: existingLinks[0].LinkIdentifier,
		}, nil
	}

	// 7. 生成推广链接标识
	var agentIdentifier types.AgentIdentifier
	agentIdentifier.AgentID = agentModel.Id
	agentIdentifier.ProductID = req.ProductId
	agentIdentifier.SetPrice = req.SetPrice
	agentIdentifierByte, err := json.Marshal(agentIdentifier)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "序列化标识失败, %v", err)
	}

	// 8. 加密链接标识
	secretKey := l.svcCtx.Config.Encrypt.SecretKey
	key, decodeErr := hex.DecodeString(secretKey)
	if decodeErr != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "获取AES密钥失败: %+v", decodeErr)
	}

	encrypted, err := crypto.AesEncryptURL(agentIdentifierByte, key)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "加密链接标识失败, %v", err)
	}

	// 9. 保存推广链接
	agentLink := &model.AgentLink{
		AgentId:         agentModel.Id,
		UserId:          userID,
		ProductId:       req.ProductId,
		LinkIdentifier:  encrypted,
		SetPrice:        req.SetPrice,
		ActualBasePrice: actualBasePrice,
	}

	_, err = l.svcCtx.AgentLinkModel.Insert(l.ctx, nil, agentLink)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "保存推广链接失败, %v", err)
	}

	return &types.AgentGeneratingLinkResp{
		LinkIdentifier: encrypted,
	}, nil
}

// getLevelBonus 获取等级加成
func (l *GeneratingLinkLogic) getLevelBonus(level int64) int64 {
	switch level {
	case 1: // 普通
		return 6
	case 2: // 黄金
		return 3
	case 3: // 钻石
		return 0
	default:
		return 0
	}
}

// getConfigFloat 获取配置值（浮点数）
func (l *GeneratingLinkLogic) getConfigFloat(configKey string) (float64, error) {
	config, err := l.svcCtx.AgentConfigModel.FindOneByConfigKey(l.ctx, configKey)
	if err != nil {
		return 0, err
	}
	value, err := strconv.ParseFloat(config.ConfigValue, 64)
	if err != nil {
		return 0, errors.Wrapf(err, "解析配置值失败, key: %s, value: %s", configKey, config.ConfigValue)
	}
	return value, nil
}