package users

import (
	"context"
	"database/sql"
	"time"

	"backend/app/events"
	"backend/database/fields"
	"backend/database/models/qvyun_v2/public/model"
	"backend/database/models/qvyun_v2/public/table"
	"backend/pkg/oauth"
	"backend/providers/event"
	"backend/providers/otel"

	. "github.com/go-jet/jet/v2/postgres"
	"github.com/samber/lo"
	log "github.com/sirupsen/logrus"
	"go.opentelemetry.io/otel/attribute"
	semconv "go.opentelemetry.io/otel/semconv/v1.15.0"
	"golang.org/x/crypto/bcrypt"
)

// @provider:except
type Service struct {
	db    *sql.DB
	event *event.PubSub
	log   *log.Entry `inject:"false"`
}

func (svc *Service) Prepare() error {
	svc.log = log.WithField("module", "users.service")
	_ = Int(1)
	return nil
}

// GetUsersByOpenID Get user by open id
func (svc *Service) GetUserByOpenID(ctx context.Context, channel fields.AuthChannel, openID string) (*model.Users, error) {
	_, span := otel.Start(ctx, "users.service.GetUsersByOpenID")
	defer span.End()

	userId, err := svc.GetUserIDByOpenID(ctx, channel, openID)
	if err != nil {
		// span 添加用户不存在事件
		span.AddEvent("user not found")
		return nil, err
	}

	tbl := table.Users
	stmt := tbl.SELECT(tbl.AllColumns).WHERE(tbl.ID.EQ(Int64(userId)))
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var user model.Users
	if err := stmt.QueryContext(ctx, svc.db, &user); err != nil {
		return nil, err
	}

	return &user, nil
}

func (svc *Service) GetUserIDByOpenID(ctx context.Context, channel fields.AuthChannel, openID string) (int64, error) {
	_, span := otel.Start(ctx, "users.service.GetUserIDByOpenID")
	defer span.End()

	span.SetAttributes(
		attribute.String("channel", channel.String()),
		attribute.String("openID", openID),
	)

	tbl := table.UserOauths

	stmt := tbl.
		SELECT(tbl.UserID.AS("user_id")).
		WHERE(
			tbl.Channel.EQ(Int16(int16(channel))).
				AND(tbl.OpenID.EQ(String(openID))),
		)
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var result struct {
		UserID int64
	}

	if err := stmt.QueryContext(ctx, svc.db, &result); err != nil {
		return 0, err
	}

	return result.UserID, nil
}

// CreateUser
func (svc *Service) CreateUser(ctx context.Context, user *model.Users) (*model.Users, error) {
	_, span := otel.Start(ctx, "users.service.CreateUser")
	defer span.End()
	span.SetAttributes(
		attribute.String("user.username", user.Username),
		attribute.String("user.email", user.Email),
		attribute.String("user.phone", user.Phone),
	)

	if user.CreatedAt.IsZero() {
		user.CreatedAt = time.Now()
	}

	if user.UpdatedAt.IsZero() {
		user.UpdatedAt = time.Now()
	}

	user.Status = int16(fields.UserStatusPending)

	// use bcrypt to hash password
	pwd, err := bcrypt.GenerateFromPassword([]byte(user.Password), bcrypt.DefaultCost)
	if err != nil {
		return nil, err
	}
	user.Password = string(pwd)

	tbl := table.Users
	stmt := tbl.INSERT(tbl.MutableColumns).MODEL(user).ON_CONFLICT(tbl.Email, tbl.Phone, tbl.Username).DO_NOTHING().RETURNING(tbl.AllColumns)
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var m model.Users
	if err = stmt.QueryContext(ctx, svc.db, &m); err != nil {
		return nil, err
	}

	// if user created successfully, trigger event
	span.AddEvent("user created")
	svc.event.Publish(&events.UserRegister{ID: m.ID})

	return &m, err
}

// GetUserByID
func (svc *Service) GetUserByID(ctx context.Context, userID int64) (*model.Users, error) {
	_, span := otel.Start(ctx, "users.service.GetUserByID")
	defer span.End()
	span.SetAttributes(
		attribute.Int64("user.id", userID),
	)

	tbl := table.Users
	stmt := tbl.SELECT(tbl.AllColumns).WHERE(tbl.ID.EQ(Int64(userID)))
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var user model.Users
	if err := stmt.QueryContext(ctx, svc.db, &user); err != nil {
		return nil, err
	}

	return &user, nil
}

// AttachUserOAuth
func (svc *Service) AttachUserOAuth(ctx context.Context, user *model.Users, channel fields.AuthChannel, oauthInfo oauth.OAuthInfo) error {
	_, span := otel.Start(ctx, "users.service.AttachUserOAuth")
	defer span.End()
	span.SetAttributes(
		attribute.Int64("user.id", user.ID),
		attribute.String("channel", channel.String()),
		attribute.String("openID", oauthInfo.GetOpenID()),
	)

	m := &model.UserOauths{
		ID:           0,
		CreatedAt:    time.Now(),
		UpdatedAt:    time.Now(),
		DeletedAt:    nil,
		Channel:      channel,
		UserID:       user.ID,
		UnionID:      lo.ToPtr(oauthInfo.GetUnionID()),
		OpenID:       oauthInfo.GetOpenID(),
		AccessToken:  oauthInfo.GetAccessToken(),
		RefreshToken: oauthInfo.GetRefreshToken(),
		ExpireAt:     oauthInfo.GetExpiredAt(),
		Meta:         new(string),
	}

	tbl := table.UserOauths
	stmt := tbl.
		INSERT(tbl.MutableColumns).
		MODEL(m).
		ON_CONFLICT(tbl.Channel, tbl.UserID).
		DO_UPDATE(
			SET(
				tbl.UnionID.SET(String(oauthInfo.GetUnionID())),
				tbl.OpenID.SET(String(oauthInfo.GetOpenID())),
				tbl.AccessToken.SET(String(oauthInfo.GetAccessToken())),
				tbl.RefreshToken.SET(String(oauthInfo.GetRefreshToken())),
				tbl.ExpireAt.SET(TimestampT(oauthInfo.GetExpiredAt())),
			),
		)

	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	if _, err := stmt.ExecContext(ctx, svc.db); err != nil {
		return err
	}

	return nil
}