package app

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

func TestResolveCampaignConfigPathExplicitWins(t *testing.T) {
	explicit := filepath.Join(t.TempDir(), "custom-campaign.yml")
	got, err := resolveCampaignConfigPathWithCandidates(explicit, []string{filepath.Join(t.TempDir(), "campaign.yml")})
	if err != nil {
		t.Fatalf("resolveCampaignConfigPathWithCandidates() error = %v", err)
	}
	if got != explicit {
		t.Fatalf("path = %q, want explicit path %q", got, explicit)
	}
}

func TestResolveCampaignConfigPathUsesFirstExistingDefault(t *testing.T) {
	dir := t.TempDir()
	missing := filepath.Join(dir, "missing.yml")
	found := filepath.Join(dir, "campaign.yml")
	if err := os.WriteFile(found, []byte("campaign: sample-campaign\n"), 0o644); err != nil {
		t.Fatalf("write campaign.yml: %v", err)
	}

	got, err := resolveCampaignConfigPathWithCandidates("", []string{missing, found})
	if err != nil {
		t.Fatalf("resolveCampaignConfigPathWithCandidates() error = %v", err)
	}
	if got != filepath.Clean(found) {
		t.Fatalf("path = %q, want %q", got, filepath.Clean(found))
	}
}

func TestResolveCampaignConfigPathErrorIncludesSearchedPaths(t *testing.T) {
	_, err := resolveCampaignConfigPathWithCandidates("", []string{"/usr/local/etc/narratio/campaign.yml", "/etc/narratio/campaign.yml"})
	if err == nil {
		t.Fatal("expected error, got nil")
	}
	if !strings.Contains(err.Error(), "searched") {
		t.Fatalf("error = %q, want searched paths", err.Error())
	}
	if !strings.Contains(err.Error(), "pass --campaign") {
		t.Fatalf("error = %q, want explicit-campaign guidance", err.Error())
	}
}