package core

import (
	"path/filepath"
	"runtime"
)

// binaryNames maps GOOS -> GOARCH -> mihomo release asset base name.
// Mirrors core_manager.py's platform_map (core_manager.py:38-55). Unlike the
// Python version, no separate arch-normalization table is needed since
// runtime.GOARCH already reports "amd64"/"386"/"arm64"/"arm".
var binaryNames = map[string]map[string]string{
	"windows": {
		"amd64": "mihomo-windows-amd64",
		"386":   "mihomo-windows-386",
		"arm64": "mihomo-windows-arm64",
		"arm":   "mihomo-windows-arm32v7",
	},
	"linux": {
		"amd64": "mihomo-linux-amd64",
		"386":   "mihomo-linux-386",
		"arm64": "mihomo-linux-arm64",
		"arm":   "mihomo-linux-armv7",
	},
	"darwin": {
		"amd64": "mihomo-darwin-amd64",
		"arm64": "mihomo-darwin-arm64",
	},
}

// platformInfo returns (system, arch, binaryNameBase), or ok=false if the
// current platform/arch combination is unsupported.
func platformInfo() (system, arch, binaryName string, ok bool) {
	system = runtime.GOOS
	arch = runtime.GOARCH

	archs, systemSupported := binaryNames[system]
	if !systemSupported {
		return "", "", "", false
	}
	name, archSupported := archs[arch]
	if !archSupported {
		return "", "", "", false
	}
	return system, arch, name, true
}

// binaryPath returns the local path where the mihomo executable for the
// current platform is (or will be) stored.
func binaryPath(binDir string) string {
	system, arch, _, ok := platformInfo()
	if !ok {
		system, arch = runtime.GOOS, runtime.GOARCH
	}
	suffix := "-" + system + "-" + arch
	name := "mihomo" + suffix
	if system == "windows" {
		name += ".exe"
	}
	return filepath.Join(binDir, name)
}