Restructure & refactor codebase

internal/glance/widget-shared.go

@@ -0,0 +1,62 @@
+package glance
+
+import (
+	"math"
+	"sort"
+	"time"
+)
+
+const twitchGqlEndpoint = "https://gql.twitch.tv/gql"
+const twitchGqlClientId = "kimne78kx3ncx6brgo4mv6wki5h1ko"
+
+type forumPost struct {
+	Title           string
+	DiscussionUrl   string
+	TargetUrl       string
+	TargetUrlDomain string
+	ThumbnailUrl    string
+	CommentCount    int
+	Score           int
+	Engagement      float64
+	TimePosted      time.Time
+	Tags            []string
+	IsCrosspost     bool
+}
+
+type forumPostList []forumPost
+
+const depreciatePostsOlderThanHours = 7
+const maxDepreciation = 0.9
+const maxDepreciationAfterHours = 24
+
+func (p forumPostList) calculateEngagement() {
+	var totalComments int
+	var totalScore int
+
+	for i := range p {
+		totalComments += p[i].CommentCount
+		totalScore += p[i].Score
+	}
+
+	numberOfPosts := float64(len(p))
+	averageComments := float64(totalComments) / numberOfPosts
+	averageScore := float64(totalScore) / numberOfPosts
+
+	for i := range p {
+		p[i].Engagement = (float64(p[i].CommentCount)/averageComments + float64(p[i].Score)/averageScore) / 2
+
+		elapsed := time.Since(p[i].TimePosted)
+
+		if elapsed < time.Hour*depreciatePostsOlderThanHours {
+			continue
+		}
+
+		p[i].Engagement *= 1.0 - (math.Max(elapsed.Hours()-depreciatePostsOlderThanHours, maxDepreciationAfterHours)/maxDepreciationAfterHours)*maxDepreciation
+	}
+}
+
+func (p forumPostList) sortByEngagement() {
+	sort.Slice(p, func(i, j int) bool {
+		return p[i].Engagement > p[j].Engagement
+	})
+}