package schema

import (
	"errors"
	"reflect"
	"slices"

	"github.com/google/generative-ai-go/genai"
	"github.com/openai/openai-go"
)

type enum struct {
	basic

	values []string
}

func (e enum) FunctionParameters() openai.FunctionParameters {
	return openai.FunctionParameters{
		"type":        "string",
		"description": e.Description(),
		"enum":        e.values,
	}
}

func (e enum) GoogleParameters() *genai.Schema {
	return &genai.Schema{
		Type:        genai.TypeString,
		Description: e.Description(),
		Enum:        e.values,
	}
}

func (e enum) AnthropicInputSchema() map[string]any {
	return map[string]any{
		"type":        "string",
		"description": e.Description(),
		"enum":        e.values,
	}
}

func (e enum) FromAny(val any) (reflect.Value, error) {
	v := reflect.ValueOf(val)
	if v.Kind() != reflect.String {
		return reflect.Value{}, errors.New("expected string, got " + v.Kind().String())
	}

	s := v.String()
	if !slices.Contains(e.values, s) {
		return reflect.Value{}, errors.New("value " + s + " not in enum")
	}

	return v, nil
}

func (e enum) SetValueOnField(obj reflect.Value, val reflect.Value) {
	if !e.required {
		val = val.Addr()
	}
	obj.Field(e.index).Set(val)
}