package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"text/template"

	"github.com/xor-gate/debpkg"
	"src.dualinventive.com/go/common/version/version"
)

func miscDir() string {
	_, file, _, _ := runtime.Caller(0)
	return filepath.Dir(filepath.Dir(file)) + "/misc"
}

func processTemplate(t *template.Template, name string, vars interface{}) (string, error) {
	f, err := ioutil.TempFile("", name)
	if err != nil {
		return "", err
	}
	defer f.Close()

	if err := t.ExecuteTemplate(f, name, vars); err != nil {
		return "", err
	}
	return f.Name(), nil
}

func main() {
	t, err := template.New("tex").Delims("@", "@").Option("missingkey=error").ParseGlob(miscDir() + "/*.in")
	if err != nil {
		panic(err)
	}

	deb := debpkg.New()
	if err := deb.Config("package.yml"); err != nil {
		panic(fmt.Errorf("Error while loading config file: %v", err))
	}
	deb.SetName(os.Getenv("PROJECT_NAME"))
	deb.SetVersion(version.GetVersion())

	vars := map[string]interface{}{
		"PROJECT_APP_NAME":                    os.Getenv("PROJECT_NAME"),
		"CPACK_PROJECT_APP_NAME":              strings.TrimLeft(os.Getenv("PROJECT_NAME"), "di-"),
		"CPACK_DEBIAN_INSTALL_POSTINST_EXTRA": "",
	}

	file, err := processTemplate(t, "prerm.in", vars)
	if err != nil {
		panic(err)
	}
	deb.AddControlExtra("prerm", file)

	file, err = processTemplate(t, "postinst.in", vars)
	if err != nil {
		panic(err)
	}
	deb.AddControlExtra("postinst", file)

	file, err = processTemplate(t, "postrm.in", vars)
	if err != nil {
		panic(err)
	}
	deb.AddControlExtra("postrm", file)

	if err := deb.Write(""); err != nil {
		fmt.Println("debpkg: error:", err)
		return
	}
}