package main

import (
	"errors"
	"flag"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
)

func Init() {
	flag.Parse()

	var err error

	ModulePath, err = filepath.Abs(flag.Arg(0))
	if err != nil {
		ColorError.Fprintln(os.Stderr, "determining module path failed")
		os.Exit(1)
	}

	*OutputDir, err = filepath.Abs(*OutputDir)
	if err != nil {
		ColorError.Fprintln(os.Stderr, "determining output path failed")
		os.Exit(1)
	}

	if _, err := exec.LookPath("go"); err != nil {
		ColorError.Fprintln(os.Stderr, "go not found in PATH. compilation not possible")
		os.Exit(1)
	}

	if err := FillCompileConfigs(); err != nil {
		ColorError.Fprintln(os.Stderr, fmt.Errorf("target architectures could not be determined: %w", err))
		os.Exit(1)
	}

	if _, err := os.Stat(filepath.Join(ModulePath, "go.mod")); errors.Is(err, os.ErrNotExist) {
		ColorError.Fprintf(os.Stderr, "no Go module found at '%s'\n", ModulePath)
		os.Exit(1)
	}

	if err := DetermineProjectName(); err != nil {
		ColorError.Fprintln(os.Stderr, fmt.Errorf("project name could not be determined: %w", err))
		os.Exit(1)
	}

	if err := os.MkdirAll(*OutputDir, 0744); err != nil {
		ColorError.Fprintln(os.Stderr, fmt.Errorf("output folder '%s' could not be made: %w", *OutputDir, err))
		os.Exit(1)
	}

	if err := CheckDirWritable(*OutputDir); err != nil {
		ColorError.Fprintf(os.Stderr, "output folder '%s' has insufficient permissions\n", *OutputDir)
		os.Exit(1)
	}

	if !*NoCompress {
		if _, err := exec.LookPath("upx"); err != nil {
			ColorWarn.Fprintln(os.Stderr, "upx not found in PATH. file compression not possible")
			*NoCompress = true
		}
	}
}