package gql

import (

"context"

"encoding/json"

"errors"

"fmt"

"strings"

)

func AsGQL(ctx context.Context, req interface{}) (*string, error) {

mp := make(map[string]interface{})

bytes, err := json.Marshal(req)

if err != nil {

return nil, err

}

err = json.Unmarshal(bytes, &mp)

if err != nil {

return nil, err

}

fields := []string{}

for k, i := range mp {

// GQL Selection

switch i.(type) {

case bool:

// GQL Selection

fields = append(fields, k)

case map[string]interface{}:

// Nested GQL/Struct

nested, err := AsGQL(ctx, i)

if err != nil {

return nil, err

}

fields = append(fields, fmt.Sprintf("%s {\n%s\n}", k, *nested))

default:

return nil, errors.New("Unsupported Type! Cannot generate GQL")

}

}

q := strings.Join(fields, "\n")

return &q, nil

}