module Graphql.Generator.Mutation exposing (generate)

import Graphql.Generator.Context exposing (Context)
import Graphql.Generator.Field as FieldGenerator
import Graphql.Generator.Imports as Imports
import Graphql.Generator.StaticImports as StaticImports
import Graphql.Parser.ClassCaseName as ClassCaseName
import Graphql.Parser.Type as Type exposing (Field)
import String.Interpolate exposing (interpolate)


generate : Context -> List String -> List Field -> String
generate context moduleName fields =
    prepend context moduleName fields
        ++ (List.map (FieldGenerator.generateForObject context (context.mutation |> Maybe.withDefault (ClassCaseName.build ""))) fields |> String.join "\n\n")


prepend : Context -> List String -> List Field -> String
prepend ({ apiSubmodule } as context) moduleName fields =
    interpolate
        """module {0} exposing (..)

{2}
{1}
"""
        [ moduleName |> String.join "."
        , Imports.importsString apiSubmodule moduleName fields
        , StaticImports.all context
        ]