add `delete-claim` command (#12)

Closes #9

cmd/themis-server/main.go

@@ -104,6 +104,18 @@ func main() {
 				},
 			},
 		},
+		{
+			Name:        "delete-claim",
+			Description: "Release one of your claims",
+			Type:        discordgo.ChatApplicationCommand,
+			Options: []*discordgo.ApplicationCommandOption{
+				{
+					Name:        "id",
+					Description: "numerical ID for the claim",
+					Type:        discordgo.ApplicationCommandOptionInteger,
+				},
+			},
+		},
 	}
 	handlers := map[string]Handler{
 		"ping": func(s *discordgo.Session, i *discordgo.InteractionCreate) {
@@ -219,6 +231,40 @@ func main() {
 				log.Println("[error] failed to respond to command:", err)
 			}
 		},
+		"delete-claim": func(s *discordgo.Session, i *discordgo.InteractionCreate) {
+			id := i.ApplicationCommandData().Options[0]
+			nick := i.Member.Nick
+			if nick == "" {
+				nick = i.Member.User.Username
+			}
+			err := store.DeleteClaim(ctx, int(id.IntValue()), nick)
+			if err != nil {
+				msg := "Oops, something went wrong :( blame @wperron"
+				if errors.Is(err, themis.ErrNoSuchClaim) {
+					msg = err.Error()
+				}
+				log.Printf("[error]: %s\n", err)
+				err = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+					Type: discordgo.InteractionResponseChannelMessageWithSource,
+					Data: &discordgo.InteractionResponseData{
+						Content: msg,
+					},
+				})
+				if err != nil {
+					log.Println("[error] failed to respond to command:", err)
+				}
+			}
+
+			err = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+				Type: discordgo.InteractionResponseChannelMessageWithSource,
+				Data: &discordgo.InteractionResponseData{
+					Content: "Got it chief.",
+				},
+			})
+			if err != nil {
+				log.Println("[error] failed to respond to command:", err)
+			}
+		},
 	}
 
 	registerHandlers(discord, handlers)

store.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	_ "embed"
+	"errors"
 	"fmt"
 	"strings"
 
@@ -268,3 +269,26 @@ func (s *Store) DescribeClaim(ctx context.Context, ID int) (ClaimDetail, error)
 		Provinces: provinces,
 	}, nil
 }
+
+var ErrNoSuchClaim = errors.New("No such claim found for player")
+
+func (s *Store) DeleteClaim(ctx context.Context, ID int, player string) error {
+	stmt, err := s.db.PrepareContext(ctx, "DELETE FROM claims WHERE id = ? AND player = ?")
+	if err != nil {
+		return fmt.Errorf("failed to prepare query: %w", err)
+	}
+
+	res, err := stmt.ExecContext(ctx, ID, player)
+	if err != nil {
+		return fmt.Errorf("failed to delete claim ID %d: %w", ID, err)
+	}
+
+	rows, err := res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("failed to get affected rows: %w", err)
+	}
+	if rows == 0 {
+		return ErrNoSuchClaim
+	}
+	return nil
+}

store_test.go

@@ -9,8 +9,10 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+const TEST_CONN_STRING = "file::memory:?cache=shared"
+
 func TestStore_Claim(t *testing.T) {
-	store, err := NewStore("file::memory:?cache=shared")
+	store, err := NewStore(TEST_CONN_STRING)
 	assert.NoError(t, err)
 
 	type args struct {
@@ -70,7 +72,7 @@ func TestStore_Claim(t *testing.T) {
 }
 
 func TestAvailability(t *testing.T) {
-	store, err := NewStore("file::memory:?cache=shared")
+	store, err := NewStore(TEST_CONN_STRING)
 	assert.NoError(t, err)
 
 	store.Claim(context.TODO(), "foo", "Genoa", CLAIM_TYPE_TRADE)
@@ -115,3 +117,19 @@ func TestAvailability(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, 3, len(availability)) // availability for areas should be the same as before
 }
+
+func TestDeleteClaim(t *testing.T) {
+	store, err := NewStore(TEST_CONN_STRING)
+	assert.NoError(t, err)
+
+	store.Claim(context.TODO(), "foo", "Genoa", CLAIM_TYPE_TRADE)
+	store.Claim(context.TODO(), "bar", "Balkans", CLAIM_TYPE_REGION)
+	store.Claim(context.TODO(), "baz", "English Channel", CLAIM_TYPE_TRADE)
+
+	err = store.DeleteClaim(context.TODO(), 1, "foo")
+	assert.NoError(t, err)
+
+	err = store.DeleteClaim(context.TODO(), 2, "foo")
+	assert.Error(t, err)
+	assert.ErrorIs(t, err, ErrNoSuchClaim)
+}