2 files changed, 219 insertions, 0 deletions
diff --git a/internal/bookmarks/bookmarks.go b/internal/bookmarks/bookmarks.go
new file mode 100644
index 0000000..4b839ed
--- /dev/null
+++ b/internal/bookmarks/bookmarks.go
@@ -0,0 +1,173 @@
+// Package bookmarks is lectio's small persistent store of reader bookmarks
+// (a book+chapter with a note and tags), a JSON file in the data dir so the
+// web reader -- and, later, the TUI/CLI -- can share it.
+package bookmarks
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+// Bookmark is one saved place in the Bible: a book+chapter with a note and tags.
+type Bookmark struct {
+	ID      string   `json:"id"`
+	Book    string   `json:"book"` // canonical English name (Bible-corpus key)
+	Chapter int      `json:"chapter"`
+	Note    string   `json:"note"`
+	Tags    []string `json:"tags"`
+	Created string   `json:"created"` // RFC3339
+}
+
+// Store is the bookmarks file, guarded by a mutex (each op load-modify-saves).
+type Store struct {
+	path string
+	mu   sync.Mutex
+}
+
+// Open resolves the store path (${XDG_DATA_HOME:-~/.local/share}/lectio/
+// bookmarks.json, mirroring the sigla store) and returns a ready Store. It never
+// fails: a missing file simply reads as an empty list.
+func Open() *Store {
+	base := os.Getenv("XDG_DATA_HOME")
+	if base == "" {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			home = "."
+		}
+		base = filepath.Join(home, ".local", "share")
+	}
+	return &Store{path: filepath.Join(base, "lectio", "bookmarks.json")}
+}
+
+// ParseTags splits a comma-separated tag string into trimmed, non-empty tags.
+func ParseTags(s string) []string {
+	var out []string
+	for _, t := range strings.Split(s, ",") {
+		if t = strings.TrimSpace(t); t != "" {
+			out = append(out, t)
+		}
+	}
+	return out
+}
+
+// List returns all bookmarks, newest first. A missing file is an empty list,
+// not an error. If tag is non-empty, only bookmarks carrying that tag are returned.
+func (s *Store) List(tag string) ([]Bookmark, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	all, err := s.load()
+	if err != nil {
+		return nil, err
+	}
+	sort.SliceStable(all, func(i, j int) bool { return all[i].Created > all[j].Created })
+	if tag == "" {
+		return all, nil
+	}
+	var out []Bookmark
+	for _, b := range all {
+		for _, t := range b.Tags {
+			if t == tag {
+				out = append(out, b)
+				break
+			}
+		}
+	}
+	return out, nil
+}
+
+// Add assigns an ID + Created timestamp, appends the bookmark, and saves.
+func (s *Store) Add(b Bookmark) (Bookmark, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	all, err := s.load()
+	if err != nil {
+		return Bookmark{}, err
+	}
+	b.ID = strconv.FormatInt(time.Now().UnixNano(), 36)
+	// RFC3339Nano (not plain RFC3339): two Adds can land in the same
+	// wall-clock second, and List's newest-first sort needs the extra
+	// precision to break the tie correctly (RFC3339Nano is still valid
+	// RFC3339 -- fractional seconds are permitted, just usually omitted).
+	b.Created = time.Now().Format(time.RFC3339Nano)
+	all = append(all, b)
+	if err := s.save(all); err != nil {
+		return Bookmark{}, err
+	}
+	return b, nil
+}
+
+// Delete removes the bookmark with id (a no-op if absent).
+func (s *Store) Delete(id string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	all, err := s.load()
+	if err != nil {
+		return err
+	}
+	kept := all[:0]
+	for _, b := range all {
+		if b.ID != id {
+			kept = append(kept, b)
+		}
+	}
+	return s.save(kept)
+}
+
+// Tags returns the sorted, de-duplicated set of all tags in use.
+func (s *Store) Tags() ([]string, error) {
+	all, err := s.List("")
+	if err != nil {
+		return nil, err
+	}
+	set := map[string]bool{}
+	for _, b := range all {
+		for _, t := range b.Tags {
+			set[t] = true
+		}
+	}
+	tags := make([]string, 0, len(set))
+	for t := range set {
+		tags = append(tags, t)
+	}
+	sort.Strings(tags)
+	return tags, nil
+}
+
+func (s *Store) load() ([]Bookmark, error) {
+	data, err := os.ReadFile(s.path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	var list []Bookmark
+	if len(data) == 0 {
+		return nil, nil
+	}
+	if err := json.Unmarshal(data, &list); err != nil {
+		return nil, err
+	}
+	return list, nil
+}
+
+func (s *Store) save(list []Bookmark) error {
+	if err := os.MkdirAll(filepath.Dir(s.path), 0o755); err != nil {
+		return err
+	}
+	data, err := json.MarshalIndent(list, "", "  ")
+	if err != nil {
+		return err
+	}
+	tmp := s.path + ".tmp"
+	if err := os.WriteFile(tmp, data, 0o644); err != nil {
+		return err
+	}
+	return os.Rename(tmp, s.path)
+}
diff --git a/internal/bookmarks/bookmarks_test.go b/internal/bookmarks/bookmarks_test.go
new file mode 100644
index 0000000..40e10e0
--- /dev/null
+++ b/internal/bookmarks/bookmarks_test.go
@@ -0,0 +1,46 @@
+package bookmarks
+
+import (
+	"testing"
+)
+
+func TestStoreRoundTrip(t *testing.T) {
+	t.Setenv("XDG_DATA_HOME", t.TempDir())
+	s := Open()
+
+	if got, _ := s.List(""); len(got) != 0 {
+		t.Fatalf("empty store should list nothing, got %d", len(got))
+	}
+	b, err := s.Add(Bookmark{Book: "John", Chapter: 3, Note: "for God so loved", Tags: []string{"grace", "gospel"}})
+	if err != nil || b.ID == "" || b.Created == "" {
+		t.Fatalf("add: %+v err=%v", b, err)
+	}
+	if _, err := s.Add(Bookmark{Book: "Luke", Chapter: 15, Tags: []string{"gospel"}}); err != nil {
+		t.Fatal(err)
+	}
+
+	all, _ := s.List("")
+	if len(all) != 2 || all[0].Book != "Luke" { // newest first
+		t.Errorf("list = %+v", all)
+	}
+	tagged, _ := s.List("grace")
+	if len(tagged) != 1 || tagged[0].Book != "John" {
+		t.Errorf("tag filter = %+v", tagged)
+	}
+	if tags, _ := s.Tags(); len(tags) != 2 || tags[0] != "gospel" {
+		t.Errorf("tags = %v", tags)
+	}
+	if err := s.Delete(b.ID); err != nil {
+		t.Fatal(err)
+	}
+	if all, _ := s.List(""); len(all) != 1 || all[0].Book != "Luke" {
+		t.Errorf("after delete = %+v", all)
+	}
+}
+
+func TestParseTags(t *testing.T) {
+	got := ParseTags("  grace , gospel ,, mercy ")
+	if len(got) != 3 || got[0] != "grace" || got[2] != "mercy" {
+		t.Errorf("ParseTags = %v", got)
+	}
+}