package config

import (
	"os"
	"testing"

	"github.com/spf13/viper"
	"github.com/stretchr/testify/assert"
)

// ---- ConfigDir ----

func TestConfigDirDefault(t *testing.T) {
	os.Unsetenv("CONFIG_PATH")
	assert.Equal(t, ".", ConfigDir())
}

func TestConfigDirFromEnv(t *testing.T) {
	os.Setenv("CONFIG_PATH", "/etc/app/config")
	defer os.Unsetenv("CONFIG_PATH")
	assert.Equal(t, "/etc/app/config", ConfigDir())
}

// ---- TZ ----

func TestTZDefault(t *testing.T) {
	os.Unsetenv("TZ")
	assert.Equal(t, "Asia/Shanghai", TZ())
}

func TestTZFromEnv(t *testing.T) {
	os.Setenv("TZ", "UTC")
	defer os.Unsetenv("TZ")
	assert.Equal(t, "UTC", TZ())
}

// ---- Init ----

func TestInitNoConfigFile(t *testing.T) {
	viper.Reset()
	defer viper.Reset()

	// Point to a directory that has no config.yaml — Init should log a
	// warning (ConfigFileNotFoundError) but must not call log.Fatalf.
	os.Setenv("CONFIG_PATH", t.TempDir())
	defer os.Unsetenv("CONFIG_PATH")

	assert.NotPanics(t, func() { Init() })
}

func TestInitWithConfigFile(t *testing.T) {
	viper.Reset()
	defer viper.Reset()

	dir := t.TempDir()
	// Write a minimal valid config file
	yaml := []byte("server:\n  application: test-app\n  address: :9090\n")
	if err := os.WriteFile(dir+"/config.yaml", yaml, 0644); err != nil {
		t.Fatal(err)
	}

	os.Setenv("CONFIG_PATH", dir)
	defer os.Unsetenv("CONFIG_PATH")

	assert.NotPanics(t, func() { Init() })
	assert.Equal(t, "test-app", viper.GetString("server.application"))
	assert.Equal(t, ":9090", viper.GetString("server.address"))
}