package database

import (
	"encoding/json"
	"strings"
	"testing"
	"time"
)

func TestApplyEnvPreservesFilePoolAndHidesDSN(t *testing.T) {
	cfg := DefaultConfig()
	cfg.MaxOpenConns = 3
	cfg.MaxIdleConns = 1
	cfg.PingTimeout = time.Second
	t.Setenv("OMNI_TEST_DSN", "user:secret@tcp(localhost:3306)/test")
	t.Setenv("OMNI_TEST_MAX_IDLE_CONNS", "0")
	got, err := ApplyEnv(cfg, "OMNI_TEST_")
	if err != nil {
		t.Fatal(err)
	}
	if got.MaxOpenConns != 3 || got.MaxIdleConns != 0 || got.PingTimeout != time.Second {
		t.Fatalf("lost file defaults: %+v", got)
	}
	data, err := json.Marshal(got)
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(string(data), "secret") || !strings.Contains(string(data), "maxOpenConns") {
		t.Fatalf("unsafe config encoding: %s", data)
	}
	t.Setenv("OMNI_TEST_MAX_OPEN_CONNS", "bad")
	if _, err = ApplyEnv(cfg, "OMNI_TEST_"); err == nil {
		t.Fatal("invalid override accepted")
	}
}