// Package native provides a generator target describing the current system.
// This is accomplished using several conditionally compiled source files.
package native

import "runtime"
import "git.tebibyte.media/fspl/fspl/generator"

// LLVM supported operating systems (note: capitalization is wrong)
// https://llvm.org/doxygen/Triple_8h_source.html
// GOOS and GOARCH values:
// https://go.dev/doc/install/source#environment

// NativeTarget returns a target describing the current system.
func NativeTarget () generator.Target {
	target := generator.Target { }
	switch runtime.GOARCH {
	case "386":      target.WordSize = 32; target.Arch = "i386"
	case "amd64":    target.WordSize = 64; target.Arch = "x86_64"
	case "amd64p32": target.WordSize = 32; target.Arch = "x86" // might be inaccurate
	case "arm":      target.WordSize = 32; target.Arch = "arm"
	case "arm64":    target.WordSize = 64; target.Arch = "aarch64"
	case "arm64be":  target.WordSize = 64; target.Arch = "aarch64_be"
	case "armbe":    target.WordSize = 32; target.Arch = "armeb"
	case "loong":    target.WordSize = 32; target.Arch = "loongarch32"
	case "loong64":  target.WordSize = 64; target.Arch = "loongarch64"
	case "mips":     target.WordSize = 32; target.Arch = "mips"
	case "mips64":   target.WordSize = 64; target.Arch = "mips64"
	case "mips64le": target.WordSize = 64; target.Arch = "mips64el"
	case "mipsle":   target.WordSize = 32; target.Arch = "mipsel"
	case "ppc":      target.WordSize = 32; target.Arch = "ppc32"
	case "ppc64":    target.WordSize = 64; target.Arch = "ppc64"
	case "ppc64le":  target.WordSize = 64; target.Arch = "ppc64le"
	case "riscv":    target.WordSize = 32; target.Arch = "riscv32"
	case "riscv64":  target.WordSize = 64; target.Arch = "riscv64"
	case "sparc":    target.WordSize = 32; target.Arch = "sparc"
	case "sparc64":  target.WordSize = 64; target.Arch = "sparcv9"
	case "wasm":     target.WordSize = 64; target.Arch = "wasm64"
	default:         target.WordSize = 64; target.Arch = "unknown"
	}
	switch runtime.GOOS {
	case "aix":       target.OS = "aix"
	case "android":   target.OS = "linux"
	case "darwin":    target.OS = "darwin"
	case "dragonfly": target.OS = "dragonfly"
	case "freebsd":   target.OS = "freebsd"
	case "illumos":   target.OS = "illumos"
	case "ios":       target.OS = "ios"
	case "js":        target.OS = "unknown"
	case "linux":     target.OS = "linux"
	case "nacl":      target.OS = "nacl"
	case "netbsd":    target.OS = "netbsd"
	case "openbsd":   target.OS = "openbsd"
	case "plan9":     target.OS = "plan9" // does not seem to be supported by LLVM at the moment
	case "solaris":   target.OS = "solaris"
	case "wasip1":    target.OS = "wasi"
	case "windows":   target.OS = "win32"
	default:          target.OS = "unknown"
	}
	
	return target
}