package main import ( "fmt" "time" ) type scan struct { start time.Time origin *System dist float64 nextHitIndex int nextEchoIndex int results []scanResult } type scanResult struct { system *System dist float64 players map[*Connection]bool colonizedBy *Connection } func (r *scanResult) Empty() bool { return (r.players == nil || len(r.players) == 0) && r.colonizedBy == nil } func (r *scanResult) playerNames() []string { if r.players == nil || len(r.players) == 0 { return nil } names := make([]string, 0, len(r.players)) for conn := range r.players { names = append(names, conn.Name()) } return names } func NewScan(origin *System) *scan { return &scan{ origin: origin, start: time.Now(), results: make([]scanResult, 0, len(origin.Distances())), } } func (s *scan) Tick(frame int64) { s.dist += options.lightSpeed s.hits() s.echos() } func (s *scan) Dead() bool { return s.nextEchoIndex >= len(s.origin.Distances()) } func (s *scan) String() string { return fmt.Sprintf("[scan origin: %s start_time: %v]", s.origin.name, s.start) } func (s *scan) hits() { for ; s.nextHitIndex < len(s.origin.Distances()); s.nextHitIndex += 1 { candidate := s.origin.Distances()[s.nextHitIndex] if s.dist < candidate.dist { break } s.results = append(s.results, s.hitSystem(candidate.s, candidate.dist)) log_info("scan hit %v. Traveled %v in %v", candidate.s.name, candidate.dist, time.Since(s.start)) } } func (s *scan) hitSystem(sys *System, dist float64) scanResult { sys.NotifyInhabitants("scan detected from %v\n", s.origin) r := scanResult{ system: sys, colonizedBy: sys.colonizedBy, dist: dist * 2.0, } if sys.players != nil { r.players = make(map[*Connection]bool, len(sys.players)) for k, v := range sys.players { r.players[k] = v } } return r } func (s *scan) echos() { for ; s.nextEchoIndex < len(s.results); s.nextEchoIndex += 1 { res := s.results[s.nextEchoIndex] if s.dist < res.dist { break } log_info("echo from %v reached origin %v after %v", res.system.name, s.origin.name, time.Since(s.start)) if res.Empty() { continue } s.origin.NotifyInhabitants("results from scan of %v:\n", res.system) s.origin.NotifyInhabitants("\tdistance: %v\n", s.origin.DistanceTo(res.system)) inhabitants := res.playerNames() if inhabitants != nil { s.origin.NotifyInhabitants("\tinhabitants: %v\n", inhabitants) } if res.colonizedBy != nil { s.origin.NotifyInhabitants("\tcolonized by: %v\n", res.colonizedBy.Name()) } } }