package user

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"os"
	"time"

	"bdrp-server/app/main/api/internal/svc"
	"bdrp-server/app/main/api/internal/types"
	"bdrp-server/app/main/model"
	"bdrp-server/common/ctxdata"
	"bdrp-server/common/xerr"
	"bdrp-server/pkg/lzkit/crypto"

	pkgerrors "github.com/pkg/errors"
	"github.com/zeromicro/go-zero/core/logx"
	"github.com/zeromicro/go-zero/core/stores/redis"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
)

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

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

// cancelledMobilePlain 生成唯一占位明文手机号（11 位），用于释放真实手机号唯一约束
func cancelledMobilePlain(userID int64) string {
	return fmt.Sprintf("199%09d", userID%1000000000)
}

func (l *CancelOutLogic) CancelOut(req *types.CancelOutReq) error {
	userID, err := ctxdata.GetUidFromCtx(l.ctx)
	if err != nil {
		return pkgerrors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "用户信息, %v", err)
	}

	user, err := l.svcCtx.UserModel.FindOne(l.ctx, userID)
	if err != nil {
		if errors.Is(err, model.ErrNotFound) {
			return pkgerrors.Wrapf(xerr.NewErrCode(xerr.USER_NOT_FOUND), "用户不存在")
		}
		return pkgerrors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "查询用户失败: %v", err)
	}
	if user.Disable == 1 {
		return pkgerrors.Wrapf(xerr.NewErrCode(xerr.USER_DISABLED), "账号已被封禁")
	}
	if user.CancelledAt.Valid {
		return pkgerrors.Wrapf(xerr.NewErrCode(xerr.USER_CANCELLED), "账号已注销")
	}
	if !user.Mobile.Valid || user.Mobile.String == "" {
		return pkgerrors.Wrapf(xerr.NewErrMsg("请先绑定手机号后再注销账号"), "注销账号, 未绑定手机号 userId=%d", userID)
	}

	secretKey := l.svcCtx.Config.Encrypt.SecretKey
	encryptedMobile := user.Mobile.String

	if os.Getenv("ENV") != "development" {
		codeKey := fmt.Sprintf("%s:%s", "cancelAccount", encryptedMobile)
		cacheCode, err := l.svcCtx.Redis.Get(codeKey)
		if err != nil {
			if errors.Is(err, redis.Nil) {
				return pkgerrors.Wrapf(xerr.NewErrMsg("验证码已过期"), "注销账号, 验证码过期")
			}
			return pkgerrors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "注销账号, 读取验证码失败: %v", err)
		}
		if cacheCode != req.Code {
			return pkgerrors.Wrapf(xerr.NewErrMsg("验证码不正确"), "注销账号, 验证码不正确")
		}
	}

	placeholderPlain := cancelledMobilePlain(userID)
	placeholderEnc, err := crypto.EncryptMobile(placeholderPlain, secretKey)
	if err != nil {
		return pkgerrors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "注销账号, 生成占位手机号失败: %v", err)
	}

	agentModel, err := l.svcCtx.AgentModel.FindOneByUserId(l.ctx, userID)
	if err != nil && !errors.Is(err, model.ErrNotFound) {
		return pkgerrors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "查询代理信息失败: %v", err)
	}

	err = l.svcCtx.UserModel.Trans(l.ctx, func(tranCtx context.Context, session sqlx.Session) error {
		dbUser, err := l.svcCtx.UserModel.FindOne(tranCtx, userID)
		if err != nil {
			return err
		}
		if dbUser.CancelledAt.Valid {
			return xerr.NewErrCode(xerr.USER_CANCELLED)
		}

		dbUser.CancelledAt = sql.NullTime{Time: time.Now(), Valid: true}
		dbUser.Mobile = sql.NullString{String: placeholderEnc, Valid: true}
		dbUser.Nickname = sql.NullString{String: "已注销用户", Valid: true}
		dbUser.Password = sql.NullString{Valid: false}
		dbUser.Info = ""
		if err := l.svcCtx.UserModel.UpdateWithVersion(tranCtx, session, dbUser); err != nil {
			return pkgerrors.Wrapf(err, "更新用户注销状态失败")
		}

		authBuilder := l.svcCtx.UserAuthModel.SelectBuilder().Where("user_id = ?", userID)
		userAuths, err := l.svcCtx.UserAuthModel.FindAll(tranCtx, authBuilder, "")
		if err != nil && !errors.Is(err, model.ErrNotFound) {
			return pkgerrors.Wrapf(err, "查询用户授权失败")
		}
		for _, ua := range userAuths {
			if err := l.svcCtx.UserAuthModel.Delete(tranCtx, session, ua.Id); err != nil {
				return pkgerrors.Wrapf(err, "删除用户授权失败 id=%d", ua.Id)
			}
		}

		queryBuilder := l.svcCtx.QueryModel.SelectBuilder().Where("user_id = ?", userID)
		queries, err := l.svcCtx.QueryModel.FindAll(tranCtx, queryBuilder, "")
		if err != nil && !errors.Is(err, model.ErrNotFound) {
			return pkgerrors.Wrapf(err, "查询用户查询记录失败")
		}
		for _, q := range queries {
			if err := l.svcCtx.QueryModel.Delete(tranCtx, session, q.Id); err != nil {
				return pkgerrors.Wrapf(err, "删除查询记录失败 id=%d", q.Id)
			}
		}

		if agentModel != nil {
			ag, err := l.svcCtx.AgentModel.FindOne(tranCtx, agentModel.Id)
			if err != nil {
				return err
			}
			ag.Mobile = placeholderEnc
			ag.WechatId = sql.NullString{Valid: false}
			if err := l.svcCtx.AgentModel.UpdateWithVersion(tranCtx, session, ag); err != nil {
				return pkgerrors.Wrapf(err, "更新代理占位信息失败")
			}
		}

		return nil
	})
	if err != nil {
		var ce *xerr.CodeError
		if errors.As(err, &ce) {
			return ce
		}
		return pkgerrors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "用户注销失败: %v", err)
	}

	return nil
}