feat(app): add internal components batch 4

internal/app/library.go

@@ -0,0 +1,59 @@
+package app
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+type libraryLoadError struct {
+	failures map[string]error
+}
+
+func (failure *libraryLoadError) Error() string {
+	var messages []string
+	for source, cause := range failure.failures {
+		messages = append(messages, fmt.Sprintf("%s 获取失败: %v", source, publicError(cause)))
+	}
+	sort.Strings(messages)
+	return strings.Join(messages, "\n")
+}
+
+func dramaProvider(drama Drama) string {
+	if source := canonicalProviderSource(drama.Source); source != "" {
+		return source
+	}
+	if source, _, ok := splitProviderDramaID(drama.ID); ok {
+		return source
+	}
+	return ""
+}
+
+func mergeLoadedDramas(cached, fresh []Drama, loadErr error) []Drama {
+	return mergeSourceDramas(cached, fresh, loadErr, "")
+}
+
+func matchesSourceFilter(provider, source string) bool {
+	return canonicalProviderSource(provider) == sourceHongguo && (source == "" || canonicalProviderSource(source) == sourceHongguo)
+}
+
+func mergeSourceDramas(cached, fresh []Drama, loadErr error, source string) []Drama {
+	cached, fresh = onlyHongguoDramas(cached), onlyHongguoDramas(fresh)
+	merged := make([]Drama, 0, len(cached)+len(fresh))
+	positions := make(map[string]int, cap(merged))
+	for _, batch := range [][]Drama{cached, fresh} {
+		for _, drama := range batch {
+			if drama.ID == "" {
+				continue
+			}
+			if position, found := positions[drama.ID]; found {
+				merged[position] = mergeDramaMetadata(drama, merged[position])
+			} else {
+				positions[drama.ID] = len(merged)
+				merged = append(merged, drama)
+			}
+		}
+	}
+	sort.SliceStable(merged, func(left, right int) bool { return merged[left].DisplayTitle() < merged[right].DisplayTitle() })
+	return merged
+}