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package canvas
import (
"database/sql"
"path/filepath"
"testing"
"penguins.lan/database"
)
func canvasTestDB(t *testing.T) *sql.DB {
db, err := sql.Open("sqlite3", filepath.Join(t.TempDir(), "c.db"))
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { db.Close() })
if _, err := database.Migrate(db); err != nil {
t.Fatal(err)
}
return db
}
func pixelAt(buf []byte, x, y int) int {
i := (y*Cols + x) * 3
return int(buf[i])<<16 | int(buf[i+1])<<8 | int(buf[i+2])
}
func TestCurrentCanvasReplaysPixels(t *testing.T) {
db := canvasTestDB(t)
if _, err := database.SavePixel(db, "u", 1, 2, 0xe50000); err != nil {
t.Fatal(err)
}
buf, err := currentCanvas(db)
if err != nil {
t.Fatal(err)
}
if got := pixelAt(buf, 1, 2); got != 0xe50000 {
t.Errorf("placed pixel = %06x, want e50000", got)
}
if got := pixelAt(buf, 0, 0); got != defaultColor {
t.Errorf("untouched pixel = %06x, want white", got)
}
}
func TestSnapshotBakesThenReplays(t *testing.T) {
db := canvasTestDB(t)
if _, err := database.SavePixel(db, "u", 5, 5, 0x000000); err != nil {
t.Fatal(err)
}
if err := takeSnapshot(db); err != nil {
t.Fatal(err)
}
if _, err := database.SavePixel(db, "u", 6, 6, 0x02be01); err != nil {
t.Fatal(err)
}
buf, err := currentCanvas(db)
if err != nil {
t.Fatal(err)
}
if got := pixelAt(buf, 5, 5); got != 0x000000 {
t.Errorf("baked pixel = %06x, want black", got)
}
if got := pixelAt(buf, 6, 6); got != 0x02be01 {
t.Errorf("replayed pixel = %06x, want green", got)
}
if err := takeSnapshot(db); err != nil {
t.Fatal(err)
}
var n int
if err := db.QueryRow("SELECT COUNT(*) FROM canvas_snapshots").Scan(&n); err != nil {
t.Fatal(err)
}
if n != 1 {
t.Errorf("snapshot rows = %d, want 1", n)
}
}
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