refactor: split subscription planner modules

internal/service/subscription_guid.go

@@ -0,0 +1,69 @@
+package service
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+func stableRSSItemGUID(title, guid, link, enclosureURL string) string {
+	parts := []string{"rss", strings.ToLower(strings.TrimSpace(title))}
+	for _, raw := range []string{guid, enclosureURL, link} {
+		if key := stableDownloadURLKey(raw); key != "" {
+			parts = append(parts, key)
+			return strings.Join(parts, "|")
+		}
+		if raw = strings.TrimSpace(raw); raw != "" {
+			parts = append(parts, strings.ToLower(raw))
+			return strings.Join(parts, "|")
+		}
+	}
+	return strings.Join(parts, "|")
+}
+
+func stableSiteSearchGUID(item SearchResult, download string) string {
+	parts := []string{
+		"site",
+		strings.ToLower(strings.TrimSpace(firstNonEmpty(item.SiteID, item.SiteName))),
+		strings.ToLower(strings.TrimSpace(item.Category)),
+		strings.ToLower(strings.TrimSpace(item.Title)),
+		fmt.Sprintf("%d", item.Size),
+	}
+	if key := stableDownloadURLKey(download); key != "" {
+		parts = append(parts, key)
+	}
+	return strings.Join(parts, "|")
+}
+
+func stableDownloadURLKey(raw string) string {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return ""
+	}
+	u, err := url.Parse(raw)
+	if err != nil {
+		return strings.ToLower(raw)
+	}
+	if strings.EqualFold(u.Scheme, "magnet") {
+		xt := strings.ToLower(strings.TrimSpace(u.Query().Get("xt")))
+		if xt != "" {
+			return "magnet:" + xt
+		}
+		return strings.ToLower(raw)
+	}
+	if u.Host == "" {
+		return strings.ToLower(raw)
+	}
+	q := u.Query()
+	kept := make([]string, 0, 4)
+	for _, key := range []string{"id", "tid", "torrent", "torrent_id", "torrentid", "hash", "info_hash"} {
+		if value := strings.TrimSpace(q.Get(key)); value != "" {
+			kept = append(kept, key+"="+strings.ToLower(value))
+		}
+	}
+	base := strings.ToLower(strings.TrimRight(u.Host, "/") + "/" + strings.TrimLeft(u.Path, "/"))
+	if len(kept) > 0 {
+		return base + "?" + strings.Join(kept, "&")
+	}
+	return base
+}