package app

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

func TestResolveConfigPathExplicit(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "custom.json")
	if err := os.WriteFile(path, []byte("{}"), 0o600); err != nil {
		t.Fatal(err)
	}
	got, err := ResolveConfigPath(path, "")
	if err != nil {
		t.Fatal(err)
	}
	want, _ := filepath.Abs(path)
	if got != want {
		t.Fatalf("got %q, want %q", got, want)
	}
}

func TestResolveConfigPathEnvironmentIsAuthoritative(t *testing.T) {
	_, err := ResolveConfigPath("", filepath.Join(t.TempDir(), "missing.json"))
	if err == nil || !strings.Contains(err.Error(), "ENV_CONTROLLER_CONFIG") {
		t.Fatalf("expected environment-path error, got %v", err)
	}
}

func TestResolveConfigPathCurrentDirectory(t *testing.T) {
	oldWD, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}
	dir := t.TempDir()
	if err := os.Chdir(dir); err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = os.Chdir(oldWD) })

	path := filepath.Join(dir, "controller.json")
	if err := os.WriteFile(path, []byte("{}"), 0o600); err != nil {
		t.Fatal(err)
	}
	got, err := ResolveConfigPath("", "")
	if err != nil {
		t.Fatal(err)
	}
	if got != path {
		t.Fatalf("got %q, want %q", got, path)
	}
}

func TestResolveConfigPathMentionsExample(t *testing.T) {
	oldWD, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}
	dir := t.TempDir()
	if err := os.Chdir(dir); err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = os.Chdir(oldWD) })

	example := filepath.Join(dir, "controller.example.json")
	if err := os.WriteFile(example, []byte("{}"), 0o600); err != nil {
		t.Fatal(err)
	}
	_, err = ResolveConfigPath("", "")
	if err == nil || !strings.Contains(err.Error(), example) {
		t.Fatalf("expected hint for %q, got %v", example, err)
	}
}