package config

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

	"git.eeqj.de/sneak/smartconfig"
)

// writeTestConfig writes yamlContent to a temp config file and returns
// the file path.
func writeTestConfig(t *testing.T, yamlContent string) string {
	t.Helper()

	tmpDir := t.TempDir()
	configPath := filepath.Join(tmpDir, "config.yml")

	err := os.WriteFile(configPath, []byte(yamlContent), 0o600)
	if err != nil {
		t.Fatalf("failed to write test config: %v", err)
	}

	return configPath
}

// checkAllowlistHosts loads the config at configPath and asserts that
// getStringSlice returns the three expected hosts.
func checkAllowlistHosts(t *testing.T, configPath string) {
	t.Helper()

	sc, err := loadTestConfig(configPath)
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	hosts := getStringSlice(sc)

	if len(hosts) != 3 {
		t.Errorf("expected 3 hosts, got %d: %v", len(hosts), hosts)
	}

	expected := []string{"static.sneak.cloud", "sneak.berlin", testHostS3}
	for i, want := range expected {
		if i >= len(hosts) {
			t.Errorf("missing host at index %d: want %q", i, want)

			continue
		}

		if hosts[i] != want {
			t.Errorf("host[%d] = %q, want %q", i, hosts[i], want)
		}
	}
}

func TestGetStringSlice_YAMLList(t *testing.T) {
	t.Parallel()

	yamlContent := `
allowlist_hosts:
  - static.sneak.cloud
  - sneak.berlin
  - s3.sneak.cloud
`

	checkAllowlistHosts(t, writeTestConfig(t, yamlContent))
}

func TestGetStringSlice_CommaSeparated(t *testing.T) {
	t.Parallel()

	// Backwards compatibility with comma-separated string values.
	yamlContent := `allowlist_hosts: "static.sneak.cloud, sneak.berlin, s3.sneak.cloud"`

	checkAllowlistHosts(t, writeTestConfig(t, yamlContent))
}

func TestGetStringSlice_Empty(t *testing.T) {
	t.Parallel()

	configPath := writeTestConfig(t, `port: 8080`)

	sc, err := loadTestConfig(configPath)
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	hosts := getStringSlice(sc)
	if len(hosts) != 0 {
		t.Errorf("expected nil or empty slice, got %v", hosts)
	}
}

// loadTestConfig is a helper to load a config file for testing.
func loadTestConfig(path string) (*smartconfig.Config, error) {
	return smartconfig.NewFromConfigPath(path)
}