package config_test

import (
	"strings"
	"testing"

	"sneak.berlin/go/netwatch/internal/config"
	"sneak.berlin/go/netwatch/internal/globals"
	"sneak.berlin/go/netwatch/internal/logger"

	"go.uber.org/fx"
)

// requireConfigError builds the config as main does and fails the
// test unless that fails with an error naming setting. It uses
// fx.New, because fxtest.New fails the test itself on an error.
func requireConfigError(t *testing.T, setting string) {
	t.Helper()

	app := fx.New(
		fx.NopLogger,
		fx.Provide(globals.New, logger.New, config.New),
		fx.Invoke(func(*config.Config) {}),
	)

	err := app.Err()
	if err == nil || !strings.Contains(err.Error(), setting) {
		t.Fatalf("config error = %v, want one naming %s", err, setting)
	}
}

// TestReportsPerMinuteMustBePositive: unchecked, zero would panic
// when the routes are built, and a negative rate would lift the
// limit.
func TestReportsPerMinuteMustBePositive(t *testing.T) {
	t.Setenv("REPORTS_PER_MINUTE", "0")

	requireConfigError(t, "REPORTS_PER_MINUTE")
}

// TestDataDirMaxBytesMustBeANumber: viper reads a value that is not
// a number, such as "1GB", as 0, which would refuse every report.
func TestDataDirMaxBytesMustBeANumber(t *testing.T) {
	t.Setenv("DATA_DIR_MAX_BYTES", "1GB")

	requireConfigError(t, "DATA_DIR_MAX_BYTES")
}