package gql

import (
	"fmt"

	"github.com/graphql-go/graphql"

	s3errors "git.kapelle.org/niklas/s3browser/internal/errors"
	helper "git.kapelle.org/niklas/s3browser/internal/helper"
	"git.kapelle.org/niklas/s3browser/internal/loader"
	types "git.kapelle.org/niklas/s3browser/internal/types"
	log "github.com/sirupsen/logrus"
)

//GraphqlSchema generate the schema with its root query and mutation
func GraphqlSchema() (graphql.Schema, error) {

	if !typesInit {
		GraphqlTypes()
	}

	queryFields := graphql.Fields{
		"files": &graphql.Field{
			Type: graphql.NewNonNull(graphql.NewList(graphql.NewNonNull(graphqlFileType))),
			Args: graphql.FieldConfigArgument{
				"path": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				path, ok := p.Args["path"].(*types.ID)

				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("querry 'files': ", path)

				loader := p.Context.Value("loader").(*loader.Loader)
				return loader.GetFiles(p.Context, *path)
			},
		},
		"directories": &graphql.Field{
			Type: graphql.NewNonNull(graphql.NewList(graphql.NewNonNull(graphqlDirType))),
			Args: graphql.FieldConfigArgument{
				"path": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				path, ok := p.Args["path"].(*types.ID)

				if !ok {
					return nil, nil
				}

				log.Debug("querry 'directorys': ", path)

				loader := p.Context.Value("loader").(*loader.Loader)
				return loader.GetDirs(p.Context, *path)
			},
		},
		"file": &graphql.Field{
			Type: graphqlFileType,
			Args: graphql.FieldConfigArgument{
				"id": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				id, ok := p.Args["id"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("querry 'file': ", id)

				return types.File{
					ID: *id,
				}, nil
			},
		},
		"authorized": &graphql.Field{
			Name:        "authorized",
			Type:        graphql.NewNonNull(graphql.Boolean),
			Description: "True if the user is authorized",
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				auth := helper.IsAuthenticated(p.Context)

				return auth, nil
			},
		},
		"buckets": &graphql.Field{
			Name:        "buckets",
			Type:        graphql.NewNonNull(graphql.NewList(graphql.String)),
			Description: "List available buckets",
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				loader := p.Context.Value("loader").(*loader.Loader)
				return loader.GetBuckets(p.Context)
			},
		},
	}

	mutationFields := graphql.Fields{
		"delete": &graphql.Field{
			Type: graphql.String,
			Args: graphql.FieldConfigArgument{
				"id": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				id, ok := p.Args["id"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("mutation 'delete': ", id)

				return id, deleteMutation(p.Context, *id)
			},
		},
		"copy": &graphql.Field{
			Type: graphqlFileType,
			Args: graphql.FieldConfigArgument{
				"src": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
				"dest": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				src, ok := p.Args["src"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}
				dest, ok := p.Args["dest"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("mutation 'copy': ", src, "-->", dest)

				return copyMutation(p.Context, *src, *dest)
			},
		},
		"move": &graphql.Field{
			Type: graphql.NewNonNull(graphqlFileType),
			Args: graphql.FieldConfigArgument{
				"src": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
				"dest": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				src, ok := p.Args["src"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}
				dest, ok := p.Args["dest"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("mutation 'move': ", src, "-->", dest)

				return moveFileMutation(p.Context, *src, *dest)
			},
		},
		"moveDir": &graphql.Field{
			Type: graphql.NewNonNull(graphql.NewList(graphqlFileType)),
			Args: graphql.FieldConfigArgument{
				"src": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
				"dest": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				src, ok := p.Args["src"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}
				dest, ok := p.Args["dest"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("mutation 'moveDir': ", src, "-->", dest)

				return moveDirMutation(p.Context, *src, *dest)
			},
		},
		"createDir": &graphql.Field{
			Type: graphql.NewNonNull(graphqlDirType),
			Args: graphql.FieldConfigArgument{
				"path": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				path, ok := p.Args["path"].(*types.ID)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("mutation 'createDir': ", path)

				return createDirectory(p.Context, *path)
			},
		},
		"deleteDir": &graphql.Field{
			Type: graphql.NewNonNull(graphql.String),
			Args: graphql.FieldConfigArgument{
				"path": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(objIDType),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				if !helper.IsAuthenticated(p.Context) {
					return nil, s3errors.ErrNotAuthenticated
				}

				path, ok := p.Args["path"].(*types.ID)

				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				log.Debug("mutation 'deleteDir': ", path)

				return path, deleteDirectory(p.Context, *path)
			},
		},
		"login": &graphql.Field{
			Type: graphql.NewNonNull(graphqlLoginResultType),
			Args: graphql.FieldConfigArgument{
				"username": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.String),
				},
				"password": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.String),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				username, ok := p.Args["username"].(string)

				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				password, ok := p.Args["password"].(string)

				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				return login(p.Context, username, password)
			},
		},
	}

	rootQuery := graphql.ObjectConfig{
		Name:   "RootQuery",
		Fields: queryFields,
	}

	rootMutation := graphql.ObjectConfig{
		Name:   "RootMutation",
		Fields: mutationFields,
	}

	schemaConfig := graphql.SchemaConfig{
		Query:    graphql.NewObject(rootQuery),
		Mutation: graphql.NewObject(rootMutation),
	}

	return graphql.NewSchema(schemaConfig)
}