package config_test

import (
	"errors"
	"testing"

	"go.uber.org/fx"

	"sneak.berlin/go/dnswatcher/internal/config"
	"sneak.berlin/go/dnswatcher/internal/globals"
	"sneak.berlin/go/dnswatcher/internal/logger"
)

func TestNewReturnsErrNoTargetsWhenEmpty(t *testing.T) {
	// Cannot use t.Parallel() because t.Setenv modifies the process
	// environment.
	t.Setenv("DNSWATCHER_TARGETS", "")
	t.Setenv("DNSWATCHER_DATA_DIR", t.TempDir())

	var cfg *config.Config

	app := fx.New(
		fx.Provide(
			func() *globals.Globals {
				return &globals.Globals{
					Appname: "dnswatcher-test-empty",
				}
			},
			logger.New,
			config.New,
		),
		fx.Populate(&cfg),
		fx.NopLogger,
	)

	err := app.Err()
	if err == nil {
		t.Fatal(
			"expected error when DNSWATCHER_TARGETS is empty, got nil",
		)
	}

	if !errors.Is(err, config.ErrNoTargets) {
		t.Errorf("expected ErrNoTargets, got: %v", err)
	}
}

func TestNewSucceedsWithTargets(t *testing.T) {
	// Cannot use t.Parallel() because t.Setenv modifies the process
	// environment.
	t.Setenv("DNSWATCHER_TARGETS", "example.com")
	t.Setenv("DNSWATCHER_DATA_DIR", t.TempDir())

	// Prevent loading a local config file by changing to a temp dir.
	t.Chdir(t.TempDir())

	var cfg *config.Config

	app := fx.New(
		fx.Provide(
			func() *globals.Globals {
				return &globals.Globals{
					Appname: "dnswatcher-test-ok",
				}
			},
			logger.New,
			config.New,
		),
		fx.Populate(&cfg),
		fx.NopLogger,
	)

	err := app.Err()
	if err != nil {
		t.Fatalf(
			"expected no error with valid targets, got: %v",
			err,
		)
	}

	if len(cfg.Domains) != 1 || cfg.Domains[0] != "example.com" {
		t.Errorf(
			"expected [example.com], got domains=%v",
			cfg.Domains,
		)
	}
}