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package world
import (
"fmt"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"gopkg.in/yaml.v3"
)
// CountExtraInbound returns the number of exits in rooms OTHER than A and C
// that point into B, plus any A/C exits to B other than the expected
// (A→dir→B, C→oppositeDir→B). A nonzero result means B has been modified
// since it was inserted and a remove would silently orphan edges. It walks
// data/rooms and matches \b<id>\b against raw file contents to skip rooms
// that don't mention bID at all, then unmarshals only the matching files.
//
// Shared by the in-game room-remove command and the admin API so the two
// removal paths cannot drift.
func CountExtraInbound(dataDir string, bID, aID, cID int, dir, oppositeDir ExitDir) int {
roomsDir := filepath.Join(dataDir, "rooms")
re := regexp.MustCompile(fmt.Sprintf(`\b%d\b`, bID))
var extra int
_ = filepath.WalkDir(roomsDir, func(path string, d os.DirEntry, err error) error {
if err != nil || d.IsDir() || filepath.Ext(path) != ".yaml" {
return nil
}
data, rerr := os.ReadFile(path)
if rerr != nil {
return nil
}
if !re.MatchString(string(data)) {
return nil
}
idStr := strings.TrimSuffix(filepath.Base(path), ".yaml")
rid, serr := strconv.Atoi(idStr)
if serr != nil || rid == bID {
return nil
}
var room Room
if yerr := yaml.Unmarshal(data, &room); yerr != nil {
return nil
}
if room.Exits == nil {
return nil
}
for ed, exitDef := range room.Exits {
if exitDef.Room != bID {
continue
}
// Allowed: A→dir→B and C→oppositeDir→B.
if rid == aID && ed == dir {
continue
}
if rid == cID && ed == oppositeDir {
continue
}
extra++
}
return nil
})
return extra
}
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