package assets

import (
	"fmt"
	"io"
)

const (
	exitOK    = 0
	exitFail  = 1  // problems found / per-file failures
	exitUsage = 64 // bad invocation / unknown subcommand / bad flags
	exitTool  = 70 // missing external tool / internal error
)

// Run executes an assets subcommand. args[0] is the subcommand; returns the
// process exit code.
func Run(args []string, stdout, stderr io.Writer, getenv func(string) string) int {
	if len(args) == 0 {
		printUsage(stderr)
		return exitUsage
	}
	rest := args[1:]
	switch args[0] {
	case "check-dupes":
		return runCheckDupes(rest, stdout, stderr)
	case "clean-dupes":
		return runCleanDupes(rest, stdout, stderr)
	case "check-mdl":
		return runCheckMDL(rest, stdout, stderr)
	case "fix-mdl":
		return runFixMDL(rest, stdout, stderr)
	case "convert":
		return runConvert(rest, stdout, stderr)
	case "upscale":
		return runUpscale(rest, stdout, stderr)
	case "compile":
		return runCompile(rest, stdout, stderr, getenv)
	default:
		fmt.Fprintf(stderr, "assets: unknown subcommand %q\n\n", args[0])
		printUsage(stderr)
		return exitUsage
	}
}

func printUsage(w io.Writer) {
	fmt.Fprint(w, `usage:
  assets compile      [--nwn INSTALL] [--non-recursive] <dir>...
  assets convert      [--to dds|png|tga] [--backend PATH] [--non-recursive] <dir>...
  assets upscale      [--scale N] [--backend PATH] [--non-recursive] <dir>...
  assets check-mdl    <path>...
  assets fix-mdl      [--dry-run] <path>...
  assets check-dupes  <dir>...
  assets clean-dupes  [--dry-run] <primary> <clean>
`)
}