package agentstatus

import (
	"path/filepath"
	"strings"
)

// codexNpmPlatformDir returns the @openai npm optional-subpackage directory
// name that holds the platform-specific codex binary, e.g.
// "codex-darwin-arm64". ok is false for platforms codex does not publish.
//
// The @openai/codex npm package is only a JS launcher; the real binary lives
// in a per-platform optionalDependency subpackage. A missing/incomplete
// subpackage is the root cause of the spawn ENOENT seen in the field.
func codexNpmPlatformDir(goos, goarch string) (string, bool) {
	var nodeOS string
	switch goos {
	case "darwin":
		nodeOS = "darwin"
	case "linux":
		nodeOS = "linux"
	case "windows":
		nodeOS = "win32"
	default:
		return "", false
	}
	var nodeArch string
	switch goarch {
	case "arm64":
		nodeArch = "arm64"
	case "amd64":
		nodeArch = "x64"
	case "386":
		nodeArch = "ia32"
	default:
		return "", false
	}
	return "codex-" + nodeOS + "-" + nodeArch, true
}

func codexPlatformTargetTriple(goos, goarch string) (string, bool) {
	switch goos {
	case "darwin":
		switch goarch {
		case "arm64":
			return "aarch64-apple-darwin", true
		case "amd64":
			return "x86_64-apple-darwin", true
		}
	case "linux":
		switch goarch {
		case "arm64":
			return "aarch64-unknown-linux-musl", true
		case "amd64":
			return "x86_64-unknown-linux-musl", true
		}
	case "windows":
		switch goarch {
		case "arm64":
			return "aarch64-pc-windows-msvc", true
		case "amd64":
			return "x86_64-pc-windows-msvc", true
		}
	}
	return "", false
}

func codexPackageDirForBinary(binaryPath string) string {
	packageJSONPath := findAdapterPackageJSON(binaryPath, "@openai/codex")
	if packageJSONPath == "" {
		return ""
	}
	return filepath.Dir(packageJSONPath)
}

func npmGlobalPrefixFromPackageDir(pkgDir string) string {
	pkgDir = strings.TrimSpace(pkgDir)
	if pkgDir == "" {
		return ""
	}
	// pkgDir = .../node_modules/@openai/codex
	nodeModulesDir := filepath.Dir(filepath.Dir(pkgDir))
	if filepath.Base(nodeModulesDir) != "node_modules" {
		return ""
	}
	parent := filepath.Dir(nodeModulesDir)
	if filepath.Base(parent) == "lib" {
		parent = filepath.Dir(parent)
	}
	// Reject a degenerate/root prefix (e.g. pkgDir was "/node_modules/..." or
	// "C:\node_modules\..." or "\\server\share\node_modules\...") so we never
	// hand npm a `--prefix /` (or a drive/UNC root) and clobber the filesystem
	// root. A path is a root when its own parent is itself; this is cross-platform
	// (catches "/", "C:\", "\\server\share") and also covers "." / empty.
	cleaned := filepath.Clean(parent)
	if cleaned == "." || filepath.Dir(cleaned) == cleaned {
		return ""
	}
	return parent
}