package main

import (
    "log"
    "github.com/mjarkk/yarql"
)

type Post struct {
	Id    uint `gq:",ID"`
	Title string `gq:"name"`
}

type QueryRoot struct{}

func (QueryRoot) ResolvePosts() []Post {
	return []Post{
		{1, "post 1"},
		{2, "post 2"},
		{3, "post 3"},
	}
}

type MethodRoot struct{}

func main() {
	s := yarql.NewSchema()

    err := s.Parse(QueryRoot{}, MethodRoot{}, nil)
	if err != nil {
		log.Fatal(err)
	}

	errs := s.Resolve([]byte(`
		{
			posts {
				id
				name
			}
		}
	`), yarql.ResolveOptions{})
	for _, err := range errs {
		log.Fatal(err)
	}

    fmt.Println(string(s.Result))
    // {"data": {
    //   "posts": [
    //     {"id": "1", "name": "post 1"},
    //     {"id": "2", "name": "post 2"},
    //     {"id": "3", "name": "post 3"}
    //   ]
    // },"errors":[],"extensions":{}}
}

struct {
	A string
}

struct {
	A func() string
}

type A struct {}
func (A) ResolveA() string {return "Ahh yea"}

struct {
	// internal fields are ignored
	bar string

	// ignore public fields
	Bar string `gq:"-"`
}

struct {
	// Change the graphql field name to "bar"
	Foo string `gq:"bar"`
}

struct Foo {
	// Notice the "," before the id
	Id string `gq:",id"`

	// Pointers and numbers are also supported
	// NOTE NUMBERS WILL BE CONVERTED TO STRINGS IN OUTPUT
	PostId *int `gq:",id"`
}

// Label method response as ID using AttrIsID
// The value returned for AttrIsID is ignored
// You can also still just fine append an error: (string, AttrIsID, error)
func (Foo) ResolveExampleMethod() (string, AttrIsID) {
	return "i'm an ID type", 0
}

func (A) ResolveUserID(args struct{ Id int }) int {
	return args.Id
}

func (A) ResolveMe() (*User, error) {
	me, err := fetchMe()
	return me, err
}

func (A) ResolveMe(ctx *yarql.Ctx) User {
	ctx.SetValue("resolved_me", true)
	return ctx.GetValue("me").(User)
}

yarql.RequestOptions{
	Values: map[string]interface{}{
		"key": "value",
	},
}

import "context"

yarql.RequestOptions{
	Context: context.Background(),
}

func (A) ResolveUser(ctx *yarql.Ctx) User {
	c := ctx.GetContext()
	c = context.WithValue(c, "resolved_user", true)
	ctx.SetContext(c)

	return User{}
}

// The enum type, everywhere where this value is used it will be converted to an enum in graphql
// This can also be a: string, int(*) or uint(*)
type Fruit uint8

const (
	Apple Fruit = iota
	Peer
	Grapefruit
)

func main() {
	s := yarql.NewSchema()

	// The map key is the enum it's key in graphql
	// The map value is the go value the enum key is mapped to or the other way around
	// Also the .RegisterEnum(..) method must be called before .Parse(..)
	s.RegisterEnum(map[string]Fruit{
		"APPLE":      Apple,
		"PEER":       Peer,
		"GRAPEFRUIT": Grapefruit,
	})

	s.Parse(QueryRoot{}, MethodRoot{}, nil)
}

type QuerySchema struct {
	Bar      BarWImpl
	Baz      BazWImpl
	BarOrBaz InterfaceType
}

type InterfaceType interface {
	// Interface fields
	ResolveFoo() string
	ResolveBar() string
}

type BarWImpl struct{}

// Implements hints this library to register BarWImpl
// THIS MUST BE CALLED FOR EVERY TYPE THAT IMPLEMENTS InterfaceType
var _ = yarql.Implements((*InterfaceType)(nil), BarWImpl{})

func (BarWImpl) ResolveFoo() string { return "this is bar" }
func (BarWImpl) ResolveBar() string { return "This is bar" }

type BazWImpl struct{}
var _ = yarql.Implements((*InterfaceType)(nil), BazWImpl{})
func (BazWImpl) ResolveFoo() string { return "this is baz" }
func (BazWImpl) ResolveBar() string { return "This is baz" }

func main() {
	s := yarql.NewSchema()

	// Also the .RegisterEnum(..) method must be called before .Parse(..)
	s.RegisterDirective(Directive{
		// What is the name of the directive
		Name: "skip_2",

		// Where can this directive be used in the query
		Where: []DirectiveLocation{
			DirectiveLocationField,
			DirectiveLocationFragment,
			DirectiveLocationFragmentInline,
		},

		// This methods's input work equal to field arguments
		// tough the output is required to return DirectiveModifier
		// This method is called always when the directive is used
		Method: func(args struct{ If bool }) DirectiveModifier {
			return DirectiveModifier{
				Skip: args.If,
			}
		},

		// The description of the directive
		Description: "Directs the executor to skip this field or fragment when the `if` argument is true.",
	})

	s.Parse(QueryRoot{}, MethodRoot{}, nil)
}

func (SomeStruct) ResolveUploadFile(args struct{ File *multipart.FileHeader }) string {
	// ...
}