package s3browser

import (
	"fmt"

	"github.com/graph-gophers/dataloader"
	"github.com/graphql-go/graphql"
)

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

	queryFields := graphql.Fields{
		"files": &graphql.Field{
			Type: graphql.NewNonNull(graphql.NewList(graphqlFileType)),
			Args: graphql.FieldConfigArgument{
				"path": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.String),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				path, ok := p.Args["path"].(string)

				if !ok {
					return nil, nil
				}
				loader := p.Context.Value("loader").(map[string]*dataloader.Loader)
				thunk := loader["getFiles"].Load(p.Context, dataloader.StringKey(path))
				return thunk()
			},
		},
		"directorys": &graphql.Field{
			Type: graphql.NewNonNull(graphql.NewList(graphqlDirType)),
			Args: graphql.FieldConfigArgument{
				"path": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.String),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				path, ok := p.Args["path"].(string)

				if !ok {
					return nil, nil
				}
				loader := p.Context.Value("loader").(map[string]*dataloader.Loader)
				thunk := loader["getDirs"].Load(p.Context, dataloader.StringKey(path))
				return thunk()
			},
		},
		"file": &graphql.Field{
			Type: graphqlFileType,
			Args: graphql.FieldConfigArgument{
				"id": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				id, ok := p.Args["id"].(string)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				return File{
					ID: id,
				}, nil
			},
		},
	}

	mutationFields := graphql.Fields{
		"delete": &graphql.Field{
			Type: graphql.String,
			Args: graphql.FieldConfigArgument{
				"id": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				id, ok := p.Args["id"].(string)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				return id, deleteMutation(p.Context, id)
			},
		},
		"copy": &graphql.Field{
			Type: graphqlFileType,
			Args: graphql.FieldConfigArgument{
				"src": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
				"dest": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				src, ok := p.Args["src"].(string)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}
				dest, ok := p.Args["dest"].(string)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				return copyMutation(p.Context, src, dest)
			},
		},
		"move": &graphql.Field{
			Type: graphqlFileType,
			Args: graphql.FieldConfigArgument{
				"src": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
				"dest": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				src, ok := p.Args["src"].(string)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}
				dest, ok := p.Args["dest"].(string)
				if !ok {
					return nil, fmt.Errorf("Failed to parse args")
				}

				return moveMutation(p.Context, src, dest)
			},
		},
	}

	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)
}