package broker

import (
	"encoding/json"
	"fmt"
)

type ProvisionParameters struct {
	RestoreFromLatestSnapshotOf *string `json:"restore_from_latest_snapshot_of"`
}

func ParseProvisionParameters(data []byte) (*ProvisionParameters, error) {
	var parsedParams provisionParametersParser
	err := json.Unmarshal(data, &parsedParams)
	if err != nil {
		return nil, err
	}
	if len(parsedParams.invalid) > 0 {
		return nil, fmt.Errorf("unknown provision parameters: %v", parsedParams.invalid)
	}
	return &parsedParams.valid, nil
}

type provisionParametersParser struct {
	valid   ProvisionParameters
	invalid map[string]interface{}
}

func (p *provisionParametersParser) UnmarshalJSON(bs []byte) error {
	if err := json.Unmarshal(bs, &p.valid); err != nil {
		return err
	}
	if err = json.Unmarshal(bs, &p.invalid); err != nil {
		return err
	}
	delete(p.invalid, "restore_from_latest_snapshot_of")
	return nil
}