package repo

import (
	"os"
	"path/filepath"
)

// Root finds the repository root (directory that contains apps/pkg/go.mod
// and is not itself under apps/ — i.e. the real checkout root).
func Root() string {
	wd, err := os.Getwd()
	if err != nil {
		wd = "."
	}
	cur := wd
	for i := 0; i < 16; i++ {
		// Require apps/pkg/go.mod AND a sibling marker so that walking from
		// inside apps/pkg does not treat apps/ as the root (apps/pkg/go.mod
		// would match the old top-level pkg/ layout check).
		pkgMod := filepath.Join(cur, "apps", "pkg", "go.mod")
		if _, err := os.Stat(pkgMod); err == nil {
			if markerOK(cur) {
				return cur
			}
		}
		parent := filepath.Dir(cur)
		if parent == cur {
			break
		}
		cur = parent
	}
	return wd
}

func markerOK(root string) bool {
	for _, name := range []string{"build.ps1", "README.md", "configs", "outputs"} {
		if _, err := os.Stat(filepath.Join(root, name)); err == nil {
			return true
		}
	}
	return false
}