package main

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

	"os/exec"

	"src.dualinventive.com/go/common/version/version"
)

var (
	reviewHeaderTex = `% select the document template
\documentclass[a4paper]{di/codereview}
\title{@.PROJECT_NAME@}
\author{@.USER@}
\productowner{Dual Inventive Techology Centre B.V.}
\releasedate{\DIdate\today}
\documentstatus{Concept}
\documentversion{@.VERSION@}
\begin{document}
\maketitle
`
	reviewFooterTex = `
\end{document}`

	reviewFile = `
\newpage
\rhead{\detokenize{@.FILENAME@}}
\inputminted[fontsize=\footnotesize,tabsize=8,linenos=true,numberblanklines=true,showspaces=false,breaklines=true]{@.FILETYPE@}{@.FILENAME@}
`
)

func main() {
	var sourcefiles []string
	var crMatches []string
	crtxt, err := ioutil.ReadFile("codereview.txt")
	if err == nil {
		crMatches = strings.Split(string(crtxt), "\n")
	}

	filepath.Walk(".", func(path string, f os.FileInfo, err error) error {
		if strings.HasPrefix(path, "vendor") || f.IsDir() {
			return nil
		}
		include := true
		if len(crMatches) > 0 {
			include = false
			for _, match := range crMatches {
				if strings.HasPrefix(path, match) {
					include = true
				}
			}
		}
		if include && strings.HasSuffix(path, ".go") {
			sourcefiles = append(sourcefiles, path)
		}
		return nil
	})

	crfile, err := ioutil.TempFile(".", "codereview")
	defer func() {
		name := crfile.Name()
		crfile.Close()
		os.Remove(name)
	}()
	if err != nil {
		panic(err)
	}
	t, err := template.New("tex").Delims("@", "@").Parse(reviewHeaderTex)
	if err != nil {
		panic(err)
	}

	user := os.Getenv("USER")
	if len(user) == 0 {
		user = os.Getenv("USERNAME")
	}

	ver := version.GetVersion()

	tmplData := map[string]string{
		"VERSION":      ver,
		"PROJECT_NAME": os.Getenv("PROJECT_NAME"),
		"USER":         user,
	}

	if err := t.Execute(crfile, tmplData); err != nil {
		panic(err)
	}

	for _, file := range sourcefiles {
		rt, err := template.New("tex").Delims("@", "@").Parse(reviewFile)
		if err != nil {
			panic(err)
		}
		tmplData := map[string]string{
			"FILENAME": file,
			"FILETYPE": "go",
		}
		if err := rt.Execute(crfile, tmplData); err != nil {
			panic(err)
		}
	}

	crfile.WriteString(reviewFooterTex)

	fmt.Println("PDF-Latex (pass 1)")
	c := exec.Command("/usr/local/texlive/2016/bin/x86_64-linux/pdflatex", "-interaction=batchmode", "-shell-escape", crfile.Name())
	if err := c.Run(); err != nil {
		panic(err)
	}

	fmt.Println("PDF-Latex (pass 2)")
	c = exec.Command("/usr/local/texlive/2016/bin/x86_64-linux/pdflatex", "-interaction=batchmode", "-shell-escape", crfile.Name())
	if err := c.Run(); err != nil {
		panic(err)
	}

	fmt.Println("PDF-Latex (pass 3)")
	c = exec.Command("/usr/local/texlive/2016/bin/x86_64-linux/pdflatex", "-interaction=batchmode", "-shell-escape", crfile.Name())
	if err := c.Run(); err != nil {
		panic(err)
	}

	fmt.Println("Codereview is present in codereview-" + ver + ".pdf")
	os.Remove(crfile.Name() + ".aux")
	os.Remove(crfile.Name() + ".log")
	os.Remove(crfile.Name() + ".out")
	os.Rename(crfile.Name()+".pdf", os.Getenv("PROJECT_NAME")+"-"+ver+".pdf")
}