mlbstats/internal/statsapi/feed.go

package statsapi

import (
	"encoding/json"
	"errors"
	"log"
	"strconv"
	"strings"
)

type FeedParams struct {
	GamePk string
}

type FeedResponse map[string]any

type Play struct {
	Result     result
	About      about
	AtBatIndex int
}

type result struct {
	Event       string
	Description string
	RBI         int
	AwayScore   int
	HomeScore   int
}

type about struct {
	AtBatIndex       json.Number
	IsTopInning      bool
	Inning           json.Number
	IsScoringPlay    bool
	CaptivatingIndex json.Number
}

func expand(arr []any, idx int) []any {
	var all []any
	if idx < len(arr) {
		all = arr
	} else {
		all = make([]any, idx+1)
		copy(all[:len(arr)], arr)
		all[idx] = make(map[string]any)
	}
	return all
}

func setValue(obj any, key string, value any) error {
	var err error
	switch v := obj.(type) {
	case *FeedResponse:
		log.Println("Formerly %v", (*v)[key])
		(*v)[key] = value
	case map[string]any:
		log.Println("Formerly %v", v[key])
		v[key] = value
	case []any:
		idx, err := strconv.Atoi(key)
		if err != nil {
			break
		}

		v = expand(v, idx)
		v[idx] = value
	default:
		err = errors.New("couldn't determine type")
	}

	return err
}

func patch(obj any, path string, value any) error {
	var err error
	first, rest, found := strings.Cut(path, "/")
	if !found {
		setValue(obj, first, value)
	}

	switch v := obj.(type) {
	case *FeedResponse:
		err = patch((*v)[first], rest, value)
	case map[string]any:
		err = patch(v[first], rest, value)
	case []any:
		idx, err := strconv.Atoi(first)
		if err != nil {
			break
		}

		v = expand(v, idx)
		err = patch(v[idx], rest, value)
	default:
		err = errors.New("couldn't determine type")
	}

	return err
}

func (f *FeedResponse) Patch(instr *instruction) {
	log.Println("updating %v to %v", instr.Path, instr.Value)
	err := patch(f, instr.Path, instr.Value)
	if err != nil {
		log.Println(err)
	}
}