feat(app): add character location tracking and display

esi_sso.go

@@ -78,6 +78,21 @@ type CharacterInfo struct {
 	CharacterName string `json:"character_name"`
 }
 
+// CharacterLocation represents a character's current location
+type CharacterLocation struct {
+    CharacterID     int64     `json:"character_id"`
+    CharacterName   string    `json:"character_name"`
+    SolarSystemID   int64     `json:"solar_system_id"`
+    SolarSystemName string    `json:"solar_system_name"`
+    RetrievedAt     time.Time `json:"retrieved_at"`
+}
+
+type esiCharacterLocationResponse struct {
+    SolarSystemID int64 `json:"solar_system_id"`
+    StationID     int64 `json:"station_id"`
+    StructureID   int64 `json:"structure_id"`
+}
+
 func NewESISSO(clientID string, redirectURI string, scopes []string) *ESISSO {
 	s := &ESISSO{
 		clientID:    clientID,
@@ -105,6 +120,43 @@ func (s *ESISSO) initDB() error {
 	return nil
 }
 
+// resolveSystemNameByID returns the system name for an ID from the local DB, or empty if not found
+func (s *ESISSO) resolveSystemNameByID(id int64) string {
+    if s.db == nil || id == 0 { return "" }
+    var ss SolarSystem
+    if err := s.db.Select("solarSystemName").First(&ss, "solarSystemID = ?", id).Error; err != nil { return "" }
+    return ss.SolarSystemName
+}
+
+// GetCharacterLocations returns current locations for all stored characters
+func (s *ESISSO) GetCharacterLocations(ctx context.Context) ([]CharacterLocation, error) {
+    if s.db == nil { return nil, errors.New("db not initialised") }
+    var tokens []ESIToken
+    if err := s.db.Find(&tokens).Error; err != nil { return nil, err }
+    out := make([]CharacterLocation, 0, len(tokens))
+    client := &http.Client{ Timeout: 5 * time.Second }
+    for i := range tokens {
+        t := &tokens[i]
+        tok, err := s.ensureAccessTokenFor(ctx, t)
+        if err != nil { continue }
+        req, err := http.NewRequestWithContext(ctx, http.MethodGet, esiBase+"/v2/characters/"+strconv.FormatInt(t.CharacterID,10)+"/location", nil)
+        if err != nil { continue }
+        req.Header.Set("Accept", "application/json")
+        req.Header.Set("Authorization", "Bearer "+tok)
+        resp, err := client.Do(req)
+        if err != nil { continue }
+        func() {
+            defer resp.Body.Close()
+            if resp.StatusCode != http.StatusOK { return }
+            var lr esiCharacterLocationResponse
+            if err := json.NewDecoder(resp.Body).Decode(&lr); err != nil { return }
+            name := s.resolveSystemNameByID(lr.SolarSystemID)
+            out = append(out, CharacterLocation{ CharacterID: t.CharacterID, CharacterName: t.CharacterName, SolarSystemID: lr.SolarSystemID, SolarSystemName: name, RetrievedAt: time.Now() })
+        }()
+    }
+    return out, nil
+}
+
 func (s *ESISSO) saveToken() {
 	if s.db == nil || s.characterID == 0 {
 		return