package placement

import (
	"context"
	"strings"

	libthreads "haixun-backend/internal/library/threadsapi"
)

type ReplyMediaResolveInput struct {
	AccessToken  string
	StorageState string
	ExternalID   string
	Permalink    string
	HintText     string
}

// ResolveReplyMediaWithFallback resolves a Threads reply target id via API and permalink scraping.
func ResolveReplyMediaWithFallback(ctx context.Context, in ReplyMediaResolveInput) (string, error) {
	return resolveReplyMedia(ctx, in, false)
}

// ResolveReplyMediaForPublish prefers fast permalink scraping, then API lookup.
func ResolveReplyMediaForPublish(ctx context.Context, in ReplyMediaResolveInput) (string, error) {
	return resolveReplyMedia(ctx, in, true)
}

func resolveReplyMedia(ctx context.Context, in ReplyMediaResolveInput, publishFastPath bool) (string, error) {
	if libthreads.IsNumericMediaID(in.ExternalID) {
		return strings.TrimSpace(in.ExternalID), nil
	}

	permalink := strings.TrimSpace(in.Permalink)
	if publishFastPath && permalink != "" {
		if scraped, sErr := RunResolveMediaFromPermalink(ctx, permalink, in.StorageState); sErr == nil && libthreads.IsNumericMediaID(scraped) {
			return scraped, nil
		}
	}

	client := libthreads.NewClient(in.AccessToken)
	id, err := client.ResolveReplyMedia(ctx, libthreads.ResolveReplyMediaInput{
		ExternalID: in.ExternalID,
		Permalink:  in.Permalink,
		HintText:   in.HintText,
	})
	if err == nil && libthreads.IsNumericMediaID(id) {
		return id, nil
	}

	if !publishFastPath && permalink != "" {
		if scraped, sErr := RunResolveMediaFromPermalink(ctx, permalink, in.StorageState); sErr == nil && libthreads.IsNumericMediaID(scraped) {
			return scraped, nil
		}
	}

	return "", err
}