package object

import (
	"fmt"
	"os"
	"path/filepath"

	"gopkg.in/yaml.v3"
	"thehouseoficarus/internal/behavior"
)

type ObjectStore struct {
	dataDir   string
	pathIndex map[string]string
	cache     map[string]*ObjectDef
}

func NewObjectStore(dataDir string) *ObjectStore {
	return &ObjectStore{
		dataDir:   dataDir,
		pathIndex: behavior.BuildPathIndex(filepath.Join(dataDir, "objects")),
		cache:     make(map[string]*ObjectDef),
	}
}

func (s *ObjectStore) Load(id string) (*ObjectDef, error) {
	if def, ok := s.cache[id]; ok {
		return def, nil
	}
	path, ok := s.pathIndex[id]
	if !ok {
		return nil, fmt.Errorf("read object %s: no such object", id)
	}
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("read object %s: %w", id, err)
	}
	var def ObjectDef
	if err := yaml.Unmarshal(data, &def); err != nil {
		return nil, fmt.Errorf("parse object %s: %w", id, err)
	}
	def.ID = id
	s.cache[id] = &def
	return &def, nil
}

func (s *ObjectStore) PathIndex() map[string]string {
	return s.pathIndex
}

func (s *ObjectStore) IDSet() map[string]bool {
	ids := make(map[string]bool)
	for id := range s.pathIndex {
		ids[id] = true
	}
	return ids
}

func (s *ObjectStore) Reload(dataDir string) {
	s.cache = make(map[string]*ObjectDef)
	s.pathIndex = behavior.BuildPathIndex(filepath.Join(dataDir, "objects"))
}