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package game
import "sync"
// FlagChangeCallback is invoked when a world flag value actually changes
// (old value differs from new, or new flag is created with a truthy value).
type FlagChangeCallback func(name string, value any)
// FlagStore holds world flags — shared mutable state visible to all players
// (e.g. opened doors, quest state). Player-specific flags live on
// *player.Player.Flags instead. FlagStore is safe for concurrent use.
type FlagStore struct {
mu sync.Mutex
flags map[string]any
callbacks []FlagChangeCallback
}
func NewFlagStore() *FlagStore {
return &FlagStore{flags: make(map[string]any)}
}
func (f *FlagStore) OnChange(cb FlagChangeCallback) {
f.mu.Lock()
defer f.mu.Unlock()
f.callbacks = append(f.callbacks, cb)
}
func (f *FlagStore) Get(name string) (any, bool) {
f.mu.Lock()
defer f.mu.Unlock()
v, ok := f.flags[name]
return v, ok
}
func (f *FlagStore) Set(name string, value any) {
f.mu.Lock()
old, existed := f.flags[name]
f.flags[name] = value
cbs := f.callbacks
f.mu.Unlock()
if !existed || !valuesEqual(old, value) {
for _, cb := range cbs {
cb(name, value)
}
}
}
func (f *FlagStore) SetAll(m map[string]any) {
f.mu.Lock()
changed := make(map[string]any)
for k, v := range m {
old, existed := f.flags[k]
f.flags[k] = v
if !existed || !valuesEqual(old, v) {
changed[k] = v
}
}
cbs := f.callbacks
f.mu.Unlock()
for k, v := range changed {
for _, cb := range cbs {
cb(k, v)
}
}
}
func (f *FlagStore) Delete(name string) {
f.mu.Lock()
defer f.mu.Unlock()
delete(f.flags, name)
}
func (f *FlagStore) All() map[string]any {
f.mu.Lock()
defer f.mu.Unlock()
out := make(map[string]any, len(f.flags))
for k, v := range f.flags {
out[k] = v
}
return out
}
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