add autocomplete for the claim function

cmd/themis-server/main.go

@@ -90,11 +90,17 @@ func main() {
 					Name:        "claim-type",
 					Description: "one of `area`, `region` or `trade`",
 					Type:        discordgo.ApplicationCommandOptionString,
+					Choices: []*discordgo.ApplicationCommandOptionChoice{
+						{Name: "Area", Value: themis.CLAIM_TYPE_AREA},
+						{Name: "Region", Value: themis.CLAIM_TYPE_REGION},
+						{Name: "Trade Node", Value: themis.CLAIM_TYPE_TRADE},
+					},
 				},
 				{
-					Name:        "name",
-					Description: "the name of zone claimed",
-					Type:        discordgo.ApplicationCommandOptionString,
+					Name:         "name",
+					Description:  "the name of zone claimed",
+					Type:         discordgo.ApplicationCommandOptionString,
+					Autocomplete: true,
 				},
 			},
 		},
@@ -142,6 +148,11 @@ func main() {
 			}
 		},
 		"claim": func(s *discordgo.Session, i *discordgo.InteractionCreate) {
+			if i.Type == discordgo.InteractionApplicationCommandAutocomplete {
+				handleClaimAutocomplete(ctx, store, s, i)
+				return
+			}
+
 			opts := i.ApplicationCommandData().Options
 			claimType, err := themis.ClaimTypeFromString(opts[0].StringValue())
 			if err != nil {
@@ -306,6 +317,38 @@ func formatClaimsTable(claims []themis.Claim) string {
 	return sb.String()
 }
 
+func handleClaimAutocomplete(ctx context.Context, store *themis.Store, s *discordgo.Session, i *discordgo.InteractionCreate) {
+	opts := i.ApplicationCommandData().Options
+	claimType, err := themis.ClaimTypeFromString(opts[0].StringValue())
+	if err != nil {
+		log.Printf("[error]: %s\n", err)
+		return
+	}
+
+	availability, err := store.ListAvailability(ctx, claimType, opts[1].StringValue())
+	if err != nil {
+		log.Printf("[error]: %s\n", err)
+		return
+	}
+
+	choices := make([]*discordgo.ApplicationCommandOptionChoice, 0, len(availability))
+	for _, s := range availability {
+		choices = append(choices, &discordgo.ApplicationCommandOptionChoice{
+			Name:  s,
+			Value: s,
+		})
+	}
+
+	if err := s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+		Type: discordgo.InteractionApplicationCommandAutocompleteResult,
+		Data: &discordgo.InteractionResponseData{
+			Choices: choices[:min(len(choices), 25)],
+		},
+	}); err != nil {
+		log.Printf("[error]: %s\n", err)
+	}
+}
+
 func serve(address string) error {
 	http.Handle("/health", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte("OK"))
@@ -313,3 +356,10 @@ func serve(address string) error {
 
 	return http.ListenAndServe(address, nil)
 }
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}

migrations/init.sql

@@ -3940,7 +3940,7 @@ INSERT OR IGNORE INTO provinces VALUES('4937','Lau','3','1','1','1','','Polynesi
 INSERT OR IGNORE INTO provinces VALUES('4938','Vanua Levu','5','2','2','1','','Polynesian Triangle','','Land','Oceania','Oceania','Oceania','Fiji');
 INSERT OR IGNORE INTO provinces VALUES('4939','Te Urewera','8','3','4','1','','Polynesian Triangle','','Land','Oceania','Oceania','Oceania','Te Ika a Maui Waho');
 INSERT OR IGNORE INTO provinces VALUES('4940','Lake Tulare','','','','','','','','Lake','','','','');
-INSERT OR IGNORE INTO provinces VALUES('4941','Lake Cahuilla','','','','','','','','Lake','','','',NULL);
+INSERT OR IGNORE INTO provinces VALUES('4941','Lake Cahuilla','','','','','','','','Lake','','','','');
 
 CREATE TABLE IF NOT EXISTS claim_types (
     claim_type TEXT PRIMARY KEY

store.go

@@ -144,6 +144,40 @@ func (s *Store) Claim(ctx context.Context, player, province string, claimType Cl
 	return nil
 }
 
+func (s *Store) ListAvailability(ctx context.Context, claimType ClaimType, search ...string) ([]string, error) {
+	queryParams := []any{string(claimType)}
+	queryPattern := `SELECT DISTINCT(provinces.%[1]s)
+	FROM provinces LEFT JOIN claims ON provinces.%[1]s = claims.val AND claims.claim_type = ?
+	WHERE claims.val IS NULL
+	AND provinces.typ = 'Land'`
+	if len(search) > 0 && search[0] != "" {
+		// only take one search param, ignore the rest
+		queryPattern += `AND provinces.%[1]s LIKE ?`
+		queryParams = append(queryParams, fmt.Sprintf("%%%s%%", search[0]))
+	}
+
+	stmt, err := s.db.PrepareContext(ctx, fmt.Sprintf(queryPattern, claimTypeToColumn[claimType]))
+	if err != nil {
+		return nil, fmt.Errorf("failed to prepare query: %w", err)
+	}
+
+	rows, err := stmt.QueryContext(ctx, queryParams...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute query: %w", err)
+	}
+
+	avail := make([]string, 0)
+	for rows.Next() {
+		var s string
+		if err := rows.Scan(&s); err != nil {
+			return nil, fmt.Errorf("failed to scan rows: %w", err)
+		}
+		avail = append(avail, s)
+	}
+
+	return avail, nil
+}
+
 func (s *Store) ListClaims(ctx context.Context) ([]Claim, error) {
 	stmt, err := s.db.PrepareContext(ctx, `SELECT id, player, claim_type, val FROM claims`)
 	if err != nil {

store_test.go

@@ -68,3 +68,50 @@ func TestStore_Claim(t *testing.T) {
 		})
 	}
 }
+
+func TestAvailability(t *testing.T) {
+	store, err := NewStore("file::memory:?cache=shared")
+	assert.NoError(t, err)
+
+	store.Claim(context.TODO(), "foo", "Genoa", CLAIM_TYPE_TRADE)
+	store.Claim(context.TODO(), "foo", "Venice", CLAIM_TYPE_TRADE)
+	store.Claim(context.TODO(), "foo", "English Channel", CLAIM_TYPE_TRADE)
+
+	// There's a total of 80 distinct trade nodes, there should be 77 available
+	// after the three claims above
+	availability, err := store.ListAvailability(context.TODO(), CLAIM_TYPE_TRADE)
+	assert.NoError(t, err)
+	assert.Equal(t, 77, len(availability))
+
+	store.Claim(context.TODO(), "foo", "France", CLAIM_TYPE_REGION)
+	store.Claim(context.TODO(), "foo", "Italy", CLAIM_TYPE_REGION)
+
+	// There's a total of 73 distinct regions, there should be 71 available
+	// after the two claims above
+	availability, err = store.ListAvailability(context.TODO(), CLAIM_TYPE_REGION)
+	assert.NoError(t, err)
+	assert.Equal(t, 71, len(availability))
+
+	store.Claim(context.TODO(), "foo", "Normandy", CLAIM_TYPE_AREA)
+	store.Claim(context.TODO(), "foo", "Champagne", CLAIM_TYPE_AREA)
+	store.Claim(context.TODO(), "foo", "Lorraine", CLAIM_TYPE_AREA)
+	store.Claim(context.TODO(), "foo", "Provence", CLAIM_TYPE_AREA)
+
+	// There's a total of 823 distinct regions, there should be 819 available
+	// after the four claims above
+	availability, err = store.ListAvailability(context.TODO(), CLAIM_TYPE_AREA)
+	assert.NoError(t, err)
+	assert.Equal(t, 819, len(availability))
+
+	// There is both a Trade Node and an Area called 'Valencia', while the trade
+	// node is claimed, the area should show up in the availability list (even
+	// though there are conflicting provinces)
+	store.Claim(context.TODO(), "foo", "Valencia", CLAIM_TYPE_TRADE)
+	availability, err = store.ListAvailability(context.TODO(), CLAIM_TYPE_AREA)
+	assert.NoError(t, err)
+	assert.Equal(t, 819, len(availability)) // availability for areas should be the same as before
+
+	availability, err = store.ListAvailability(context.TODO(), CLAIM_TYPE_AREA, "bay")
+	assert.NoError(t, err)
+	assert.Equal(t, 3, len(availability)) // availability for areas should be the same as before
+}