package config

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

func TestLoadUsesDefaultsAndOverrides(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "gl.toml")
	contents := []byte("[grpc]\nport = 0\nshutdown-timeout = \"3s\"\n")
	if err := os.WriteFile(path, contents, 0o600); err != nil {
		t.Fatal(err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.GRPC.Port != 0 || cfg.GRPC.ShutdownTimeout != 3*time.Second {
		t.Fatalf("unexpected grpc config: %+v", cfg.GRPC)
	}
	if cfg.Database.Name != "gl_db" || cfg.Database.Port != 5432 {
		t.Fatalf("unexpected database defaults: %+v", cfg.Database)
	}
}

func TestLoadRejectsInvalidConfiguration(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "gl.toml")
	if err := os.WriteFile(path, []byte("[grpc]\nshutdown-timeout = \"0s\"\n"), 0o600); err != nil {
		t.Fatal(err)
	}

	if _, err := Load(path); err == nil {
		t.Fatal("expected validation error")
	}
}

func TestLoadReturnsMissingFileError(t *testing.T) {
	if _, err := Load(filepath.Join(t.TempDir(), "missing.toml")); err == nil {
		t.Fatal("expected missing file error")
	}
}