package service

import (
	"context"
	"errors"
	"fmt"
	"math/rand"

	"gitea.com/bitwsd/core/common/log"
	"gitea.com/bitwsd/document_ai/internal/storage/cache"
	"gitea.com/bitwsd/document_ai/internal/storage/dao"
	"gitea.com/bitwsd/document_ai/pkg/sms"
)

type UserService struct {
	userDao *dao.UserDao
}

func NewUserService() *UserService {
	return &UserService{
		userDao: dao.NewUserDao(),
	}
}

func (svc *UserService) GetSmsCode(ctx context.Context, phone string) (string, error) {
	limit, err := cache.GetUserSendSmsLimit(ctx, phone)
	if err != nil {
		log.Error(ctx, "func", "GetSmsCode", "msg", "get user send sms limit error", "error", err)
		return "", err
	}
	if limit >= cache.UserSendSmsLimitCount {
		return "", errors.New("sms code send limit reached")
	}

	user, err := svc.userDao.GetByPhone(dao.DB.WithContext(ctx), phone)
	if err != nil {
		log.Error(ctx, "func", "GetSmsCode", "msg", "get user error", "error", err)
		return "", err
	}
	if user == nil {
		user = &dao.User{Phone: phone}
		err = svc.userDao.Create(dao.DB.WithContext(ctx), user)
		if err != nil {
			log.Error(ctx, "func", "GetSmsCode", "msg", "create user error", "error", err)
			return "", err
		}
	}

	code := fmt.Sprintf("%06d", rand.Intn(1000000))
	err = sms.SendMessage(&sms.SendSmsRequest{PhoneNumbers: phone, SignName: sms.Signature, TemplateCode: sms.TemplateCode, TemplateParam: fmt.Sprintf(sms.TemplateParam, code)})
	if err != nil {
		log.Error(ctx, "func", "GetSmsCode", "msg", "send message error", "error", err)
		return "", err
	}

	cacheErr := cache.SetUserSmsCode(ctx, phone, code)
	if cacheErr != nil {
		log.Error(ctx, "func", "GetSmsCode", "msg", "set user sms code error", "error", cacheErr)
	}
	cacheErr = cache.SetUserSendSmsLimit(ctx, phone)
	if cacheErr != nil {
		log.Error(ctx, "func", "GetSmsCode", "msg", "set user send sms limit error", "error", cacheErr)
	}
	return code, nil
}

func (svc *UserService) VerifySmsCode(ctx context.Context, phone, code string) (uid int64, err error) {
	user, err := svc.userDao.GetByPhone(dao.DB.WithContext(ctx), phone)
	if err != nil {
		log.Error(ctx, "func", "VerifySmsCode", "msg", "get user error", "error", err, "phone", phone)
		return 0, err
	}
	if user == nil {
		log.Error(ctx, "func", "VerifySmsCode", "msg", "user not found", "phone", phone)
		return 0, errors.New("user not found")
	}

	storedCode, err := cache.GetUserSmsCode(ctx, phone)
	if err != nil {
		log.Error(ctx, "func", "VerifySmsCode", "msg", "get user sms code error", "error", err)
		return 0, err
	}
	if storedCode != code {
		log.Error(ctx, "func", "VerifySmsCode", "msg", "invalid sms code", "phone", phone, "code", code, "storedCode", storedCode)
		return 0, errors.New("invalid sms code")
	}

	cacheErr := cache.DeleteUserSmsCode(ctx, phone)
	if cacheErr != nil {
		log.Error(ctx, "func", "VerifySmsCode", "msg", "delete user sms code error", "error", cacheErr)
	}

	return user.ID, nil
}

func (svc *UserService) GetUserInfo(ctx context.Context, uid int64) (*dao.User, error) {
	user, err := svc.userDao.GetByID(dao.DB.WithContext(ctx), uid)
	if err != nil {
		log.Error(ctx, "func", "GetUserInfo", "msg", "get user error", "error", err)
		return nil, err
	}

	if user == nil {
		log.Warn(ctx, "func", "GetUserInfo", "msg", "user not found", "uid", uid)
		return &dao.User{}, nil
	}

	return user, nil
}