feat(processor): fetch YouTube watch time in bulk using the API

internal/reader/processor/reading_time.go

@@ -0,0 +1,63 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package processor // import "miniflux.app/v2/internal/reader/processor
+
+import (
+	"log/slog"
+
+	"miniflux.app/v2/internal/model"
+	"miniflux.app/v2/internal/reader/readingtime"
+	"miniflux.app/v2/internal/storage"
+)
+
+func updateEntryReadingTime(store *storage.Storage, feed *model.Feed, entry *model.Entry, entryIsNew bool, user *model.User) {
+	if !user.ShowReadingTime {
+		slog.Debug("Skip reading time estimation for this user", slog.Int64("user_id", user.ID))
+		return
+	}
+
+	// Define a type for watch time fetching functions
+	type watchTimeFetcher func(string) (int, error)
+
+	// Define watch time fetching scenarios
+	watchTimeScenarios := []struct {
+		shouldFetch func(*model.Entry) bool
+		fetchFunc   watchTimeFetcher
+		platform    string
+	}{
+		{shouldFetchYouTubeWatchTimeForSingleEntry, fetchYouTubeWatchTimeForSingleEntry, "YouTube"},
+		{shouldFetchNebulaWatchTime, fetchNebulaWatchTime, "Nebula"},
+		{shouldFetchOdyseeWatchTime, fetchOdyseeWatchTime, "Odysee"},
+		{shouldFetchBilibiliWatchTime, fetchBilibiliWatchTime, "Bilibili"},
+	}
+
+	// Iterate through scenarios and attempt to fetch watch time
+	for _, scenario := range watchTimeScenarios {
+		if scenario.shouldFetch(entry) {
+			if entryIsNew {
+				if watchTime, err := scenario.fetchFunc(entry.URL); err != nil {
+					slog.Warn("Unable to fetch watch time",
+						slog.String("platform", scenario.platform),
+						slog.Int64("user_id", user.ID),
+						slog.Int64("entry_id", entry.ID),
+						slog.String("entry_url", entry.URL),
+						slog.Int64("feed_id", feed.ID),
+						slog.String("feed_url", feed.FeedURL),
+						slog.Any("error", err),
+					)
+				} else {
+					entry.ReadingTime = watchTime
+				}
+			} else {
+				entry.ReadingTime = store.GetReadTime(feed.ID, entry.Hash)
+			}
+			break
+		}
+	}
+
+	// Fallback to text-based reading time estimation
+	if entry.ReadingTime == 0 && entry.Content != "" {
+		entry.ReadingTime = readingtime.EstimateReadingTime(entry.Content, user.DefaultReadingSpeed, user.CJKReadingSpeed)
+	}
+}