package config

import (
	"os"
	"testing"

	"github.com/rs/zerolog"
	"github.com/spf13/viper"
)

// writeTestConfigFile creates a test config file at given filename location
func writeTestConfigFile(t *testing.T, filename string) {
	testdata := []byte("[application]\nlisten = \"127.0.0.1\"\n[database]\nport = 54321\ntestbool = false")
	err := os.WriteFile(filename, testdata, 0644)
	if err != nil {
		t.Fatalf("Can't write test file %q: %v", filename, err)
	}
}

// removeTestConfigFile removes given config file
func removeTestConfigFile(t *testing.T, filename string) {
	err := os.Remove(filename)
	if err != nil {
		t.Fatalf("Can't remove test file %q: %v", filename, err)
	}
}

// TestLoadConfigFile calls config.loadConfigFile
// to check if a valid Configuration can be loaded.
func TestLoadConfigFile(t *testing.T) {
	logger := NewLogger(zerolog.InfoLevel)
	dir, err := os.Getwd()
	if err != nil {
		t.Fatalf("Can't get current working directory")
	}

	testFile := dir + "/" + "config_unittest.toml"

	writeTestConfigFile(t, testFile)

	defer removeTestConfigFile(t, testFile)

	loadConfigFile(testFile, logger)

	if viper.GetString("application.listen") != "127.0.0.1" {
		t.Fatalf(`viper.GetString("application.listen") = %q, want "127.0.0.1"`, viper.GetString("application.listen"))
	}

	if viper.GetInt("database.port") != 54321 {
		t.Fatalf(`viper.GetInt("database.port") = %q, want 54321`, viper.GetInt("database.port"))
	}

	if viper.GetBool("database.testbool") != false {
		t.Fatalf(`viper.GetBool("database.testbool") = true, want false`)
	}

	if viper.GetString("invalid.config.value") != "" {
		t.Fatalf(`viper.GetString("invalid.config.value") = %q, want ""`, viper.GetString("invalid.config.value"))
	}
}