// Package integration contains genqlient's integration tests, which run
// against a real server (defined in internal/integration/server/server.go).
//
// These are especially important for cases where we generate nontrivial logic,
// such as JSON-unmarshaling.
package integration

import (
	"context"
	"net/http"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/Khan/genqlient/graphql"
	"github.com/Khan/genqlient/internal/integration/server"
)

func TestSimpleQuery(t *testing.T) {
	_ = `# @genqlient
	query simpleQuery { me { id name luckyNumber } }`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := simpleQuery(ctx, client)
	require.NoError(t, err)

	assert.Equal(t, "1", resp.Me.Id)
	assert.Equal(t, "Yours Truly", resp.Me.Name)
	assert.Equal(t, 17, resp.Me.LuckyNumber)
}

func TestServerError(t *testing.T) {
	_ = `# @genqlient
	query failingQuery { fail me { id } }`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := failingQuery(ctx, client)
	// As long as we get some response back, we should still return a full
	// response -- and indeed in this case it should even have another field
	// (which didn't err) set.
	assert.Error(t, err)
	assert.NotNil(t, resp)
	assert.Equal(t, "1", resp.Me.Id)
}

func TestNetworkError(t *testing.T) {
	ctx := context.Background()
	client := graphql.NewClient("https://nothing.invalid/graphql", http.DefaultClient)

	resp, err := failingQuery(ctx, client)
	// As we guarantee in the README, even on network error you always get a
	// non-nil response; this is so you can write e.g.
	//	resp, err := failingQuery(ctx)
	//	return resp.Me.Id, err
	// without a bunch of extra ceremony.
	assert.Error(t, err)
	assert.NotNil(t, resp)
	assert.Equal(t, new(failingQueryResponse), resp)
}

func TestVariables(t *testing.T) {
	_ = `# @genqlient
	query queryWithVariables($id: ID!) { user(id: $id) { id name luckyNumber } }`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := queryWithVariables(ctx, client, "2")
	require.NoError(t, err)

	assert.Equal(t, "2", resp.User.Id)
	assert.Equal(t, "Raven", resp.User.Name)
	assert.Equal(t, -1, resp.User.LuckyNumber)

	resp, err = queryWithVariables(ctx, client, "374892379482379")
	require.NoError(t, err)

	assert.Zero(t, resp.User)
}

func TestInterfaceNoFragments(t *testing.T) {
	_ = `# @genqlient
	query queryWithInterfaceNoFragments($id: ID!) {
		being(id: $id) { id name }
		me { id name }
	}`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := queryWithInterfaceNoFragments(ctx, client, "1")
	require.NoError(t, err)

	// We should get the following response:
	//	me: User{Id: 1, Name: "Yours Truly"},
	//	being: User{Id: 1, Name: "Yours Truly"},

	assert.Equal(t, "1", resp.Me.Id)
	assert.Equal(t, "Yours Truly", resp.Me.Name)

	// Check fields both via interface and via type-assertion:
	assert.Equal(t, "User", resp.Being.GetTypename())
	assert.Equal(t, "1", resp.Being.GetId())
	assert.Equal(t, "Yours Truly", resp.Being.GetName())

	user, ok := resp.Being.(*queryWithInterfaceNoFragmentsBeingUser)
	require.Truef(t, ok, "got %T, not User", resp.Being)
	assert.Equal(t, "1", user.Id)
	assert.Equal(t, "Yours Truly", user.Name)

	resp, err = queryWithInterfaceNoFragments(ctx, client, "3")
	require.NoError(t, err)

	// We should get the following response:
	//	me: User{Id: 1, Name: "Yours Truly"},
	//	being: Animal{Id: 3, Name: "Fido"},

	assert.Equal(t, "1", resp.Me.Id)
	assert.Equal(t, "Yours Truly", resp.Me.Name)

	assert.Equal(t, "Animal", resp.Being.GetTypename())
	assert.Equal(t, "3", resp.Being.GetId())
	assert.Equal(t, "Fido", resp.Being.GetName())

	animal, ok := resp.Being.(*queryWithInterfaceNoFragmentsBeingAnimal)
	require.Truef(t, ok, "got %T, not Animal", resp.Being)
	assert.Equal(t, "3", animal.Id)
	assert.Equal(t, "Fido", animal.Name)

	resp, err = queryWithInterfaceNoFragments(ctx, client, "4757233945723")
	require.NoError(t, err)

	// We should get the following response:
	//	me: User{Id: 1, Name: "Yours Truly"},
	//	being: null

	assert.Equal(t, "1", resp.Me.Id)
	assert.Equal(t, "Yours Truly", resp.Me.Name)

	assert.Nil(t, resp.Being)
}

func TestInterfaceListField(t *testing.T) {
	_ = `# @genqlient
	query queryWithInterfaceListField($ids: [ID!]!) {
		beings(ids: $ids) { id name }
	}`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := queryWithInterfaceListField(ctx, client,
		[]string{"1", "3", "12847394823"})
	require.NoError(t, err)

	require.Len(t, resp.Beings, 3)

	// We should get the following three beings:
	//	User{Id: 1, Name: "Yours Truly"},
	//	Animal{Id: 3, Name: "Fido"},
	//	null

	// Check fields both via interface and via type-assertion:
	assert.Equal(t, "User", resp.Beings[0].GetTypename())
	assert.Equal(t, "1", resp.Beings[0].GetId())
	assert.Equal(t, "Yours Truly", resp.Beings[0].GetName())

	user, ok := resp.Beings[0].(*queryWithInterfaceListFieldBeingsUser)
	require.Truef(t, ok, "got %T, not User", resp.Beings[0])
	assert.Equal(t, "1", user.Id)
	assert.Equal(t, "Yours Truly", user.Name)

	assert.Equal(t, "Animal", resp.Beings[1].GetTypename())
	assert.Equal(t, "3", resp.Beings[1].GetId())
	assert.Equal(t, "Fido", resp.Beings[1].GetName())

	animal, ok := resp.Beings[1].(*queryWithInterfaceListFieldBeingsAnimal)
	require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
	assert.Equal(t, "3", animal.Id)
	assert.Equal(t, "Fido", animal.Name)

	assert.Nil(t, resp.Beings[2])
}

func TestInterfaceListPointerField(t *testing.T) {
	_ = `# @genqlient
	query queryWithInterfaceListPointerField($ids: [ID!]!) {
		# @genqlient(pointer: true)
		beings(ids: $ids) {
			__typename id name
		}
	}`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := queryWithInterfaceListPointerField(ctx, client,
		[]string{"1", "3", "12847394823"})
	require.NoError(t, err)

	require.Len(t, resp.Beings, 3)

	// Check fields both via interface and via type-assertion:
	assert.Equal(t, "User", (*resp.Beings[0]).GetTypename())
	assert.Equal(t, "1", (*resp.Beings[0]).GetId())
	assert.Equal(t, "Yours Truly", (*resp.Beings[0]).GetName())

	user, ok := (*resp.Beings[0]).(*queryWithInterfaceListPointerFieldBeingsUser)
	require.Truef(t, ok, "got %T, not User", (*resp.Beings[0]))
	assert.Equal(t, "1", user.Id)
	assert.Equal(t, "Yours Truly", user.Name)

	assert.Equal(t, "Animal", (*resp.Beings[1]).GetTypename())
	assert.Equal(t, "3", (*resp.Beings[1]).GetId())
	assert.Equal(t, "Fido", (*resp.Beings[1]).GetName())

	animal, ok := (*resp.Beings[1]).(*queryWithInterfaceListPointerFieldBeingsAnimal)
	require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
	assert.Equal(t, "3", animal.Id)
	assert.Equal(t, "Fido", animal.Name)

	assert.Nil(t, *resp.Beings[2])
}

func TestFragments(t *testing.T) {
	_ = `# @genqlient
	query queryWithFragments($ids: [ID!]!) {
		beings(ids: $ids) {
			__typename id
			... on Being { id name }
			... on Animal {
				id
				hair { hasHair }
				species
				owner {
					id
					... on Being { name }
					... on User { luckyNumber }
				}
			}
			... on Lucky { luckyNumber }
			... on User { hair { color } }
		}
	}`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := queryWithFragments(ctx, client, []string{"1", "3", "12847394823"})
	require.NoError(t, err)

	require.Len(t, resp.Beings, 3)

	// We should get the following three beings:
	//	User{Id: 1, Name: "Yours Truly"},
	//	Animal{Id: 3, Name: "Fido"},
	//	null

	// Check fields both via interface and via type-assertion when possible
	// User has, in total, the fields: __typename id name luckyNumber.
	assert.Equal(t, "User", resp.Beings[0].GetTypename())
	assert.Equal(t, "1", resp.Beings[0].GetId())
	assert.Equal(t, "Yours Truly", resp.Beings[0].GetName())
	// (hair and luckyNumber we need to cast for)

	user, ok := resp.Beings[0].(*queryWithFragmentsBeingsUser)
	require.Truef(t, ok, "got %T, not User", resp.Beings[0])
	assert.Equal(t, "1", user.Id)
	assert.Equal(t, "Yours Truly", user.Name)
	assert.Equal(t, "Black", user.Hair.Color)
	assert.Equal(t, 17, user.LuckyNumber)

	// Animal has, in total, the fields:
	//	__typename
	//	id
	//	species
	//	owner {
	//		id
	//		name
	//		... on User { luckyNumber }
	//	}
	assert.Equal(t, "Animal", resp.Beings[1].GetTypename())
	assert.Equal(t, "3", resp.Beings[1].GetId())
	// (hair, species, and owner.* we have to cast for)

	animal, ok := resp.Beings[1].(*queryWithFragmentsBeingsAnimal)
	require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
	assert.Equal(t, "3", animal.Id)
	assert.Equal(t, SpeciesDog, animal.Species)
	assert.True(t, animal.Hair.HasHair)

	assert.Equal(t, "1", animal.Owner.GetId())
	assert.Equal(t, "Yours Truly", animal.Owner.GetName())
	// (luckyNumber we have to cast for, again)

	owner, ok := animal.Owner.(*queryWithFragmentsBeingsAnimalOwnerUser)
	require.Truef(t, ok, "got %T, not User", animal.Owner)
	assert.Equal(t, "1", owner.Id)
	assert.Equal(t, "Yours Truly", owner.Name)
	assert.Equal(t, 17, owner.LuckyNumber)

	assert.Nil(t, resp.Beings[2])
}

func TestNamedFragments(t *testing.T) {
	_ = `# @genqlient
	fragment AnimalFields on Animal {
		id
		hair { hasHair }
		owner { id ...UserFields ...LuckyFields }
	}

	fragment MoreUserFields on User {
		id
		hair { color }
	}

	fragment LuckyFields on Lucky {
		...MoreUserFields
		luckyNumber
	}
	
	fragment UserFields on User {
		id
		...LuckyFields
		...MoreUserFields
	}

	query queryWithNamedFragments($ids: [ID!]!) {
		beings(ids: $ids) {
			__typename id
			...AnimalFields
			...UserFields
		}
	}`

	ctx := context.Background()
	server := server.RunServer()
	defer server.Close()
	client := graphql.NewClient(server.URL, http.DefaultClient)

	resp, err := queryWithNamedFragments(ctx, client, []string{"1", "3", "12847394823"})
	require.NoError(t, err)

	require.Len(t, resp.Beings, 3)

	// We should get the following three beings:
	//	User{Id: 1, Name: "Yours Truly"},
	//	Animal{Id: 3, Name: "Fido"},
	//	null

	// Check fields both via interface and via type-assertion when possible
	// User has, in total, the fields: __typename id luckyNumber.
	assert.Equal(t, "User", resp.Beings[0].GetTypename())
	assert.Equal(t, "1", resp.Beings[0].GetId())
	// (luckyNumber, hair we need to cast for)

	user, ok := resp.Beings[0].(*queryWithNamedFragmentsBeingsUser)
	require.Truef(t, ok, "got %T, not User", resp.Beings[0])
	assert.Equal(t, "1", user.Id)
	assert.Equal(t, "1", user.UserFields.Id)
	assert.Equal(t, "1", user.UserFields.MoreUserFields.Id)
	assert.Equal(t, "1", user.UserFields.LuckyFieldsUser.MoreUserFields.Id)
	// on UserFields, but we should be able to access directly via embedding:
	assert.Equal(t, 17, user.LuckyNumber)
	assert.Equal(t, "Black", user.Hair.Color)
	assert.Equal(t, "Black", user.UserFields.MoreUserFields.Hair.Color)
	assert.Equal(t, "Black", user.UserFields.LuckyFieldsUser.MoreUserFields.Hair.Color)

	// Animal has, in total, the fields:
	//	__typename
	//	id
	//	hair { hasHair }
	//	owner { id luckyNumber }
	assert.Equal(t, "Animal", resp.Beings[1].GetTypename())
	assert.Equal(t, "3", resp.Beings[1].GetId())
	// (hair.* and owner.* we have to cast for)

	animal, ok := resp.Beings[1].(*queryWithNamedFragmentsBeingsAnimal)
	require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
	// Check that we filled in *both* ID fields:
	assert.Equal(t, "3", animal.Id)
	assert.Equal(t, "3", animal.AnimalFields.Id)
	// on AnimalFields:
	assert.True(t, animal.Hair.HasHair)
	assert.Equal(t, "1", animal.Owner.GetId())
	// (luckyNumber we have to cast for, again)

	owner, ok := animal.Owner.(*AnimalFieldsOwnerUser)
	require.Truef(t, ok, "got %T, not User", animal.Owner)
	// Check that we filled in *both* ID fields:
	assert.Equal(t, "1", owner.Id)
	assert.Equal(t, "1", owner.UserFields.Id)
	assert.Equal(t, "1", owner.UserFields.MoreUserFields.Id)
	assert.Equal(t, "1", owner.UserFields.LuckyFieldsUser.MoreUserFields.Id)
	// on UserFields:
	assert.Equal(t, 17, owner.LuckyNumber)
	assert.Equal(t, "Black", owner.UserFields.MoreUserFields.Hair.Color)
	assert.Equal(t, "Black", owner.UserFields.LuckyFieldsUser.MoreUserFields.Hair.Color)

	// Lucky-based fields we can also get by casting to the fragment-interface.
	luckyOwner, ok := animal.Owner.(LuckyFields)
	require.Truef(t, ok, "got %T, not Lucky", animal.Owner)
	assert.Equal(t, 17, luckyOwner.GetLuckyNumber())

	assert.Nil(t, resp.Beings[2])
}

func TestGeneratedCode(t *testing.T) {
	// TODO(benkraft): Check that gqlgen is up to date too.  In practice that's
	// less likely to be a problem, since it should only change if you update
	// the schema, likely too add something new, in which case you'll notice.
	RunGenerateTest(t, "internal/integration/genqlient.yaml")
}

//go:generate go run github.com/Khan/genqlient genqlient.yaml