package main

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

	"git.milar.in/milarin/buildinfo"
	"git.milar.in/milarin/configfile"
)

func Init() {
	flag.Parse()
	var err error

	if *ShowVersion {
		buildinfo.Print(buildinfo.Options{})
		os.Exit(0)
	}

	if *FindConfigFile {
		if configFilePath, err := configfile.Path("json"); err == nil {
			fmt.Println(configFilePath)
			os.Exit(0)
		}
	}

	if *SaveConfigFile {
		if configFilePath, err := SaveConfig(); err == nil {
			Println(ColorDone.Sprintf("config file saved at '%s'", configFilePath))
			os.Exit(0)
		} else {
			Println(ColorError.Sprint(fmt.Errorf("saving config file failed: %w", err)))
			os.Exit(1)
		}
	} else if !*IgnoreConfigFile {
		if err := LoadConfig(); err != nil {
			Println(ColorError.Sprint(fmt.Errorf("loading config file failed: %w", err)))
		}
	}

	OutputFileTmpl.Parse(*OutputFile)

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

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

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

	if err := FillCompileConfigs(); err != nil {
		Println(ColorError.Sprint(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) {
		Println(ColorError.Sprintf("no Go module found at '%s'", ModulePath))
		os.Exit(1)
	}

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

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

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

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