package wand

import (
	"errors"
	"fmt"
	"github.com/iancoleman/strcase"
	"io"
	"path/filepath"
)

func exec(stdout, stderr io.Writer, exit func(int), cmd Cmd, env, args []string) {
	cmd = insertHelp(cmd)
	_, cmd.name = filepath.Split(args[0])
	cmd.name = strcase.ToKebab(cmd.name)
	if err := validateCommand(cmd); err != nil {
		panic(err)
	}

	args = args[1:]
	e := readEnv(cmd.name, env)
	cmd, fullCmd, args := selectCommand(cmd, args)
	if cmd.impl == nil {
		fmt.Fprint(stderr, errors.New("subcommand not specified"))
		suggestHelp(stderr, cmd, fullCmd)
		exit(1)
		return
	}

	if cmd.helpRequested {
		showHelp(stdout, cmd, fullCmd)
		return
	}

	bo := boolOptions(cmd)
	cl := readArgs(bo, args)
	if hasHelpOption(cmd, cl.options) {
		showHelp(stdout, cmd, fullCmd)
		return
	}

	if err := validateInput(cmd, e, cl); err != nil {
		fmt.Fprint(stderr, err)
		suggestHelp(stderr, cmd, fullCmd)
		exit(1)
		return
	}

	output, err := apply(cmd, e, cl)
	if err != nil {
		fmt.Fprint(stderr, err)
		exit(1)
		return
	}

	if err := printOutput(stdout, output); err != nil {
		fmt.Fprint(stderr, err)
		exit(1)
		return
	}
}