Blog/app/internal/utils/content.go

package utils

import (
	"encoding/json"
	"strings"
)

// ExtractImageKeysFromContent parses the rich text JSON and extracts all image fileKey values
func ExtractImageKeysFromContent(content string) ([]string, error) {
	var contentData map[string]interface{}
	if err := json.Unmarshal([]byte(content), &contentData); err != nil {
		return nil, err
	}

	var imageKeys []string
	extractImageKeys(contentData, &imageKeys)
	return imageKeys, nil
}

// extractImageKeys recursively searches for image nodes and collects their fileKey values
func extractImageKeys(data interface{}, keys *[]string) {
	switch v := data.(type) {
	case map[string]interface{}:
		// Check if this is an image node
		if nodeType, ok := v["type"].(string); ok && nodeType == "image" {
			if fileKey, ok := v["fileKey"].(string); ok && fileKey != "" {
				*keys = append(*keys, fileKey)
			}
		}
		// Recurse into all map values
		for _, value := range v {
			extractImageKeys(value, keys)
		}
	case []interface{}:
		// Recurse into all array elements
		for _, item := range v {
			extractImageKeys(item, keys)
		}
	}
}

// ExtractArchiveKeysFromContent parses the rich text JSON and extracts all archive fileKey values
func ExtractArchiveKeysFromContent(content string) ([]string, error) {
	var contentData map[string]interface{}
	if err := json.Unmarshal([]byte(content), &contentData); err != nil {
		return nil, err
	}

	var archiveKeys []string
	extractArchiveKeys(contentData, &archiveKeys)
	return archiveKeys, nil
}

// extractArchiveKeys recursively searches for archive nodes and collects their fileKey values
func extractArchiveKeys(data interface{}, keys *[]string) {
	switch v := data.(type) {
	case map[string]interface{}:
		// Check if this is an archive node
		if nodeType, ok := v["type"].(string); ok && nodeType == "archive" {
			if fileKey, ok := v["fileKey"].(string); ok && fileKey != "" {
				*keys = append(*keys, fileKey)
			}
		}
		// Recurse into all map values
		for _, value := range v {
			extractArchiveKeys(value, keys)
		}
	case []interface{}:
		// Recurse into all array elements
		for _, item := range v {
			extractArchiveKeys(item, keys)
		}
	}
}

// ExtractAllFileKeysFromContent extracts both image and archive file keys from content
func ExtractAllFileKeysFromContent(content string) ([]string, error) {
	imageKeys, err := ExtractImageKeysFromContent(content)
	if err != nil {
		return nil, err
	}

	archiveKeys, err := ExtractArchiveKeysFromContent(content)
	if err != nil {
		return nil, err
	}

	// Combine both slices
	allKeys := append(imageKeys, archiveKeys...)
	return allKeys, nil
}

// ExtractHashtagsFromContent parses the rich text JSON and extracts all hashtag text values
func ExtractHashtagsFromContent(content string) ([]string, error) {
	var contentData map[string]interface{}
	if err := json.Unmarshal([]byte(content), &contentData); err != nil {
		return nil, err
	}

	var hashtags []string
	hashtagSet := make(map[string]bool) // Use map to avoid duplicates
	extractHashtags(contentData, hashtagSet)

	// Convert map keys to slice
	for tag := range hashtagSet {
		hashtags = append(hashtags, tag)
	}
	return hashtags, nil
}

// extractHashtags recursively searches for hashtag nodes and collects their text values
func extractHashtags(data interface{}, hashtags map[string]bool) {
	switch v := data.(type) {
	case map[string]interface{}:
		// Check if this is a hashtag node
		if nodeType, ok := v["type"].(string); ok && nodeType == "hashtag" {
			if text, ok := v["text"].(string); ok && text != "" {
				// Remove the # prefix if present
				tag := strings.TrimPrefix(text, "#")
				if tag != "" {
					hashtags[tag] = true
				}
			}
		}
		// Recurse into all map values
		for _, value := range v {
			extractHashtags(value, hashtags)
		}
	case []interface{}:
		// Recurse into all array elements
		for _, item := range v {
			extractHashtags(item, hashtags)
		}
	}
}