package config

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

func TestLoadFromEnvironmentOverridesYAML(t *testing.T) {
	path := filepath.Join(t.TempDir(), "app.yaml")
	if err := os.WriteFile(path, []byte("database:\n  driver: postgres\nredis:\n  enabled: false\n"), 0600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("DATABASE_DRIVER", "mysql")
	t.Setenv("DATABASE_PORT", "3307")
	t.Setenv("REDIS_ENABLED", "true")
	t.Setenv("JWT_ACCESS_EXPIRE_MINUTES", "30")

	cfg, err := LoadFrom(path)
	if err != nil {
		t.Fatalf("LoadFrom() error = %v", err)
	}
	if cfg.Database.Driver != "mysql" || cfg.Database.Port != 3307 {
		t.Fatalf("database override failed: %+v", cfg.Database)
	}
	if !cfg.Redis.Enabled || cfg.JWT.AccessExpireMinutes != 30 {
		t.Fatalf("environment override failed: redis=%v jwt=%+v", cfg.Redis.Enabled, cfg.JWT)
	}
}

func TestSQLiteDefaults(t *testing.T) {
	path := filepath.Join(t.TempDir(), "app.yaml")
	if err := os.WriteFile(path, []byte("database:\n  driver: sqlite\n"), 0600); err != nil {
		t.Fatal(err)
	}
	cfg, err := LoadFrom(path)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Database.SQLitePath == "" || cfg.Database.MaxOpenConns != 1 {
		t.Fatalf("unexpected SQLite defaults: %+v", cfg.Database)
	}
}

func TestProductionRejectsDefaultJWTSecret(t *testing.T) {
	path := filepath.Join(t.TempDir(), "app.yaml")
	if err := os.WriteFile(path, []byte("app:\n  environment: production\ndatabase:\n  driver: sqlite\n"), 0600); err != nil {
		t.Fatal(err)
	}
	if _, err := LoadFrom(path); err == nil {
		t.Fatal("production config accepted the default JWT secret")
	}
}