package config

import (
	"os"
	"path/filepath"
	"testing"
)

func TestApplyEnvFileDoesNotOverrideExisting(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, ".env")
	if err := os.WriteFile(path, []byte("DOTENV_TEST_KEY=fromfile\nDOTENV_ONLY_FILE=only\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("DOTENV_TEST_KEY", "fromprocess")
	t.Setenv("DOTENV_ONLY_FILE", "")
	// Empty existing must still block override (matches tests that clear keys).
	_ = os.Unsetenv("DOTENV_ONLY_FILE")

	if err := applyEnvFile(path); err != nil {
		t.Fatal(err)
	}
	if got := os.Getenv("DOTENV_TEST_KEY"); got != "fromprocess" {
		t.Fatalf("override: got %q", got)
	}
	if got := os.Getenv("DOTENV_ONLY_FILE"); got != "only" {
		t.Fatalf("missing fill: got %q", got)
	}
}

func TestFindMonorepoRootFromAPIDir(t *testing.T) {
	cwd, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}
	// This test file lives under apps/api/internal/config — walk should find repo root.
	root, ok := findMonorepoRoot()
	if !ok {
		t.Fatalf("findMonorepoRoot from cwd %s", cwd)
	}
	if _, err := os.Stat(filepath.Join(root, "apps", "api")); err != nil {
		t.Fatalf("root %s missing apps/api: %v", root, err)
	}
	if _, err := os.Stat(filepath.Join(root, "apps", "web")); err != nil {
		t.Fatalf("root %s missing apps/web: %v", root, err)
	}
}

func TestLoadDotEnvPathOverride(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "custom.env")
	if err := os.WriteFile(path, []byte("DOTENV_PATH_ONLY=yes\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("DOTENV_PATH", path)
	_ = os.Unsetenv("DOTENV_PATH_ONLY")
	loadDotEnv()
	if got := os.Getenv("DOTENV_PATH_ONLY"); got != "yes" {
		t.Fatalf("DOTENV_PATH load: got %q", got)
	}
}