package main

import (
	"encoding/json"
	"fmt"
  "context"

	"github.com/qri-io/jsonschema"
)

func main() {
  ctx := context.Background()
	var schemaData = []byte(`{
    "$id": "https://qri.io/schema/",
    "$comment" : "sample comment",
    "title": "Person",
    "type": "object",
    "properties": {
        "firstName": {
            "type": "string"
        },
        "lastName": {
            "type": "string"
        },
        "age": {
            "description": "Age in years",
            "type": "integer",
            "minimum": 0
        },
        "friends": {
          "type" : "array",
          "items" : { "title" : "REFERENCE", "$ref" : "#" }
        }
    },
    "required": ["firstName", "lastName"]
  }`)

  rs := &jsonschema.Schema{}
  if err := json.Unmarshal(schemaData, rs); err != nil {
    panic("unmarshal schema: " + err.Error())
  }

  var valid = []byte(`{
    "firstName" : "George",
    "lastName" : "Michael"
    }`)
  errs, err := rs.ValidateBytes(ctx, valid)
  if err != nil {
    panic(err)
  }

  if len(errs) > 0 {
    fmt.Println(errs[0].Error())
  }

  var invalidPerson = []byte(`{
    "firstName" : "Prince"
    }`)

  errs, err = rs.ValidateBytes(ctx, invalidPerson)
  if err != nil {
    panic(err)
  }
  if len(errs) > 0 {
    fmt.Println(errs[0].Error())
  }

  var invalidFriend = []byte(`{
    "firstName" : "Jay",
    "lastName" : "Z",
    "friends" : [{
      "firstName" : "Nas"
      }]
    }`)
  errs, err = rs.ValidateBytes(ctx, invalidFriend)
  if err != nil {
    panic(err)
  }
  if len(errs) > 0 {
    fmt.Println(errs[0].Error())
  }
}