From 684d0b6a57d2eb79730ade63baccdc6e59bebc29 Mon Sep 17 00:00:00 2001
From: Saya Andy <saya.andy@posteo.com>
Date: Sat, 1 Aug 2026 19:58:57 +0700
Subject: feat: repurpose metadata parser as article transcoder for saya.uz and
 telegram

---
 internal/transcoder/sayauz.go | 138 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 internal/transcoder/sayauz.go

(limited to 'internal/transcoder/sayauz.go')

diff --git a/internal/transcoder/sayauz.go b/internal/transcoder/sayauz.go
new file mode 100644
index 0000000..ee888e5
--- /dev/null
+++ b/internal/transcoder/sayauz.go
@@ -0,0 +1,138 @@
+package transcoder
+
+import (
+	"fmt"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/SayaAndy/saya-today-article-metadata-add/config"
+	"github.com/SayaAndy/saya-today-article-metadata-add/internal/draft"
+	"github.com/SayaAndy/saya-today-article-metadata-add/internal/storage"
+)
+
+type SayauzTranscoder struct {
+	category string
+	storage  storage.StorageClient
+}
+
+func NewSayauzTranscoder(cfg any) (Transcoder, error) {
+	sayauzCfg, ok := cfg.(*config.SayauzConfig)
+	if !ok {
+		return nil, fmt.Errorf("invalid config for sayauz transcoder")
+	}
+
+	newClient, ok := storage.NewStorageClientMap[sayauzCfg.Storage.Type]
+	if !ok {
+		return nil, fmt.Errorf("unsupported storage type %q for sayauz transcoder", sayauzCfg.Storage.Type)
+	}
+	storageClient, err := newClient(&sayauzCfg.Storage)
+	if err != nil {
+		return nil, fmt.Errorf("init storage client: %w", err)
+	}
+
+	return &SayauzTranscoder{
+		category: sayauzCfg.Category,
+		storage:  storageClient,
+	}, nil
+}
+
+func (t *SayauzTranscoder) Name() string { return "sayauz" }
+
+func (t *SayauzTranscoder) Transcode(doc *draft.Document) error {
+	if doc.Metadata == nil {
+		return fmt.Errorf("draft %q has no frontmatter metadata", doc.SourcePath)
+	}
+
+	prodKey := t.category + "/" + doc.Codename + ".md"
+
+	// publishedTime is the first-publish time: reuse an existing value (from the
+	// draft frontmatter, else from the already-published object), otherwise stamp now.
+	inject := doc.Metadata.PublishedTime.IsZero()
+	if inject {
+		published := time.Time{}
+		if meta, err := t.storage.GetMetadata(prodKey); err == nil {
+			if v := meta["published-time"]; v != "" {
+				if parsed, err := time.Parse(time.RFC3339, v); err == nil {
+					published = parsed
+				}
+			}
+		} else {
+			slog.Warn("could not read existing metadata for publishedTime, stamping now",
+				slog.String("key", prodKey), slog.String("error", err.Error()))
+		}
+		if published.IsZero() {
+			published = time.Now()
+		}
+		doc.Metadata.PublishedTime = published
+	}
+
+	formatted := formatContent(doc.RawContent, doc.Metadata.PublishedTime, inject)
+
+	localPath := filepath.Join(filepath.Dir(doc.SourcePath), doc.Codename+".md")
+	if err := os.WriteFile(localPath, formatted, 0o644); err != nil {
+		return fmt.Errorf("write formatted file %q: %w", localPath, err)
+	}
+
+	if err := t.storage.Put(prodKey, formatted, doc.Metadata); err != nil {
+		return fmt.Errorf("upload %q: %w", prodKey, err)
+	}
+
+	slog.Info("sayauz published page",
+		slog.String("key", prodKey),
+		slog.String("local", localPath))
+	return nil
+}
+
+func (t *SayauzTranscoder) Finalize() error {
+	return t.storage.BuildIndex()
+}
+
+// formatContent renders a draft into its published form: standalone "..."
+// separator lines become blank lines (trailing ones are dropped), and when
+// inject is true a "publishedTime:" line is added after "actionDate:" in the
+// frontmatter. Frontmatter, galleries and "---" rules are otherwise untouched.
+func formatContent(raw []byte, published time.Time, inject bool) []byte {
+	lines := strings.Split(string(raw), "\n")
+	out := make([]string, 0, len(lines)+1)
+
+	inFrontmatter := false
+	frontmatterDone := false
+
+	for i, line := range lines {
+		trimmed := strings.TrimSpace(line)
+
+		if !frontmatterDone {
+			if i == 0 && trimmed == "---" {
+				inFrontmatter = true
+				out = append(out, line)
+				continue
+			}
+			if inFrontmatter {
+				out = append(out, line)
+				switch {
+				case trimmed == "---":
+					inFrontmatter = false
+					frontmatterDone = true
+				case inject && strings.HasPrefix(trimmed, "actionDate:"):
+					out = append(out, "publishedTime: "+published.Format(time.RFC3339))
+				}
+				continue
+			}
+		}
+
+		if trimmed == "..." {
+			out = append(out, "")
+			continue
+		}
+		out = append(out, line)
+	}
+
+	for len(out) > 0 && out[len(out)-1] == "" {
+		out = out[:len(out)-1]
+	}
+
+	return []byte(strings.Join(out, "\n"))
+}
-- 
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