package couchbase

import (
	"context"
	"fmt"
	"log"
	"reflect"
	"time"

	"github.com/authorizerdev/authorizer/server/constants"
	"github.com/authorizerdev/authorizer/server/db/models"
	"github.com/authorizerdev/authorizer/server/graph/model"
	"github.com/authorizerdev/authorizer/server/memorystore"
	"github.com/couchbase/gocb/v2"
	"github.com/google/uuid"
)

// AddUser to save user information in database
func (p *provider) AddUser(ctx context.Context, user models.User) (models.User, error) {
	if user.ID == "" {
		user.ID = uuid.New().String()
	}

	if user.Roles == "" {
		defaultRoles, err := memorystore.Provider.GetStringStoreEnvVariable(constants.EnvKeyDefaultRoles)
		if err != nil {
			return user, err
		}
		user.Roles = defaultRoles
	}

	user.CreatedAt = time.Now().Unix()
	user.UpdatedAt = time.Now().Unix()
	insertOpt := gocb.InsertOptions{
		Context: ctx,
	}
	_, err := p.db.Collection(models.Collections.User).Insert(user.ID, user, &insertOpt)
	if err != nil {
		return user, err
	}
	return user, nil
}

// UpdateUser to update user information in database
func (p *provider) UpdateUser(ctx context.Context, user models.User) (models.User, error) {
	user.UpdatedAt = time.Now().Unix()
	unsertOpt := gocb.UpsertOptions{
		Context: ctx,
	}
	_, err := p.db.Collection(models.Collections.User).Upsert(user.ID, user, &unsertOpt)
	if err != nil {
		return user, err
	}
	return user, nil
}

// DeleteUser to delete user information from database
func (p *provider) DeleteUser(ctx context.Context, user models.User) error {
	removeOpt := gocb.RemoveOptions{
		Context: ctx,
	}
	_, err := p.db.Collection(models.Collections.User).Remove(user.ID, &removeOpt)
	// query := fmt.Sprintf("INSERT INTO %s %s VALUES %s IF NOT EXISTS", KeySpace+"."+models.Collections.User, fields, values)

	// sessionCollection := p.db.Collection(models.Collections.Session).Queue()
	// _, err = sessionCollection.DeleteMany(ctx, bson.M{"user_id": user.ID}, options.Delete())
	// if err != nil {
	// 	return err
	// }
	if err != nil {
		return err
	}
	return nil
}

// ListUsers to get list of users from database
func (p *provider) ListUsers(ctx context.Context, pagination model.Pagination) (*model.Users, error) {
	users := []*model.User{}
	// r := p.db.Collection(models.Collections.User).
	paginationClone := pagination

	inventoryScope := p.db.Scope("_default")
	userQuery := fmt.Sprintf("SELECT * FROM auth._default.%s ORDER BY id OFFSET %d LIMIT %d", models.Collections.User, paginationClone.Offset, paginationClone.Limit)

	queryResult, err := inventoryScope.Query(userQuery, &gocb.QueryOptions{})

	if err != nil {
		return nil, err
	}

	for queryResult.Next() {
		var user models.User
		err := queryResult.Row(&user)
		if err != nil {
			log.Fatal(err)
		}
		users = append(users, user.AsAPIUser())
	}

	if err := queryResult.Err(); err != nil {
		return nil, err

	}

	return &model.Users{
		Pagination: &paginationClone,
		Users:      users,
	}, nil
}

// GetUserByEmail to get user information from database using email address
func (p *provider) GetUserByEmail(ctx context.Context, email string) (models.User, error) {
	var user models.User
	// inventoryScope := p.db.Scope("_default")
	// userQuery := fmt.Sprintf("SELECT * FROM auth._default.%s WHERE email = '%s' LIMIT %d", models.Collections.User, email, 1)
	queryResult, err := p.db.Collection(models.Collections.User).Get("email:"+email, &gocb.GetOptions{})
	if err != nil {
		return user, err
	}

	// queryResult, err := inventoryScope.Query(userQuery, &gocb.QueryOptions{})
	err = queryResult.Content(&user)

	if err != nil {
		return user, err
	}

	// for queryResult.Next() {
	// 	var user models.User
	// 	err := queryResult.Row(&user)
	// 	if err != nil {
	// 		log.Fatal(err)
	// 	}
	// 	return user, nil
	// }

	return user, nil
}

// GetUserByID to get user information from database using user ID
func (p *provider) GetUserByID(ctx context.Context, id string) (models.User, error) {
	var user models.User
	queryResult, err := p.db.Collection(models.Collections.User).Get("id:"+id, &gocb.GetOptions{})
	if err != nil {
		return user, err
	}

	err = queryResult.Content(&user)
	if err != nil {
		return user, err
	}
	return user, nil
}

// UpdateUsers to update multiple users, with parameters of user IDs slice
// If ids set to nil / empty all the users will be updated
func (p *provider) UpdateUsers(ctx context.Context, data map[string]interface{}, ids []string) error {
	// set updated_at time for all users
	data["updated_at"] = time.Now().Unix()
	inventoryScope := p.db.Scope("_default")

	updateFields := ""
	for key, value := range data {
		if key == "_id" {
			continue
		}

		if key == "_key" {
			continue
		}

		if value == nil {
			updateFields += fmt.Sprintf("%s = null,", key)
			continue
		}

		valueType := reflect.TypeOf(value)
		if valueType.Name() == "string" {
			updateFields += fmt.Sprintf("%s = '%s', ", key, value.(string))
		} else {
			updateFields += fmt.Sprintf("%s = %v, ", key, value)
		}
	}

	if ids != nil && len(ids) > 0 {
		for _, v := range ids {
			userQuery := fmt.Sprintf("UPDATE auth._default.%s SET %s WHERE id = '%s'", models.Collections.User, updateFields, v)
			_, err := inventoryScope.Query(userQuery, &gocb.QueryOptions{})
			if err != nil {
				return err
			}
		}
	} else {
		userQuery := fmt.Sprintf("UPDATE auth._default.%s SET %s WHERE id IS NOT NULL", models.Collections.User, updateFields)
		_, err := inventoryScope.Query(userQuery, &gocb.QueryOptions{})
		if err != nil {
			return err
		}
	}

	return nil
}