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package item
import (
"fmt"
"log"
"os"
"path/filepath"
"sync"
"gopkg.in/yaml.v3"
"thehouseoficarus/internal/behavior"
)
type ItemStore struct {
mu sync.Mutex
dataDir string
pathIndex map[string]string
cache map[string]*ItemDef
}
func NewItemStore(dataDir string) *ItemStore {
s := &ItemStore{
dataDir: dataDir,
pathIndex: behavior.BuildPathIndex(filepath.Join(dataDir, "items")),
cache: make(map[string]*ItemDef),
}
return s
}
func (s *ItemStore) Load(id string) (*ItemDef, error) {
s.mu.Lock()
defer s.mu.Unlock()
if def, ok := s.cache[id]; ok {
return def, nil
}
path, ok := s.pathIndex[id]
if !ok {
return nil, fmt.Errorf("read item %s: no such item", id)
}
data, err := os.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("read item %s: %w", id, err)
}
var def ItemDef
if err := yaml.Unmarshal(data, &def); err != nil {
return nil, fmt.Errorf("parse item %s: %w", id, err)
}
warnDeclaredIDMismatch("item", path, id, def.ID)
def.ID = id
s.cache[id] = &def
return &def, nil
}
func (s *ItemStore) LoadAll() ([]*ItemDef, error) {
s.mu.Lock()
defer s.mu.Unlock()
dir := filepath.Join(s.dataDir, "items")
var defs []*ItemDef
err := behavior.WalkYAMLDir(dir, func(path, id string, data []byte) error {
if def, ok := s.cache[id]; ok {
defs = append(defs, def)
return nil
}
var def ItemDef
if err := yaml.Unmarshal(data, &def); err != nil {
return fmt.Errorf("parse item %s: %w", id, err)
}
warnDeclaredIDMismatch("item", path, id, def.ID)
def.ID = id
s.cache[id] = &def
defs = append(defs, &def)
return nil
})
return defs, err
}
// warnDeclaredIDMismatch logs when a data file declares an id: that disagrees
// with its filename. IDs come from the filename (def.ID = id above), so the
// declared value is silently ignored at runtime; without this warning an author
// sees no sign that the id they wrote is dead.
func warnDeclaredIDMismatch(kind, path, filenameID, declaredID string) {
if declaredID != "" && declaredID != filenameID {
log.Printf("%s %s: file declares id %q but is loaded as %q; the filename is authoritative and the declared id is ignored",
kind, path, declaredID, filenameID)
}
}
// PathIndex returns a copy of the id→path index, safe to iterate concurrently.
func (s *ItemStore) PathIndex() map[string]string {
s.mu.Lock()
defer s.mu.Unlock()
out := make(map[string]string, len(s.pathIndex))
for id, p := range s.pathIndex {
out[id] = p
}
return out
}
func (s *ItemStore) IDSet() map[string]bool {
s.mu.Lock()
defer s.mu.Unlock()
ids := make(map[string]bool, len(s.pathIndex))
for id := range s.pathIndex {
ids[id] = true
}
return ids
}
func (s *ItemStore) Reload(dataDir string) {
s.mu.Lock()
defer s.mu.Unlock()
s.cache = make(map[string]*ItemDef)
s.pathIndex = behavior.BuildPathIndex(filepath.Join(dataDir, "items"))
}
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