package page

import (
	"bytes"
	"errors"
	"flag"
	"fmt"
	goutil "git.gutmet.org/goutil.git/misc"
	gen "git.gutmet.org/wombat.git/generate"
	"io/ioutil"
	"os"
	"path/filepath"
	"text/template"
)

var pageStub string = `---
title: {{.Title}}
description: {{.Description}}
---
`

type page struct {
	Title       string
	Description string
}

type pageFlags struct {
	title       string
	description string
	path        string
	noserve     bool
}

func ensureDirectory(file string) {
	dir := filepath.Dir(file)
	err := os.MkdirAll(dir, 0755)
	if err != nil {
		panic(err)
	}
}

func makePageFile(path string, title string, description string, content string) error {
	ensureDirectory(path)
	page := page{}
	page.Title = title
	page.Description = description
	t := template.Must(template.New("pageStub").Parse(pageStub))
	buf := new(bytes.Buffer)
	t.Execute(buf, page)
	err := goutil.WriteFile(path, buf.String()+content)
	return err
}

func newPage(fl pageFlags) error {
	var err error
	var content string
	if fl.path == "" {
		return errors.New("need path")
	}
	if filepath.Ext(fl.path) != ".md" {
		fl.path += ".md"
	}
	if goutil.PathExists(fl.path) {
		return errors.New(fl.path + " already exists...")
	}
	if fl.description != "" && fl.title != "" {
		tmpcontent, _ := ioutil.ReadAll(os.Stdin)
		content = string(tmpcontent)
	}
	if fl.title == "" {
		fl.title, err = goutil.AskFor("Title")
		if err != nil {
			return err
		}
	}
	if fl.description == "" {
		fl.description, err = goutil.AskFor("Description")
		if err != nil {
			return err
		}
	}
	err = makePageFile(fl.path, fl.title, fl.description, content)
	if err != nil {
		return err
	}
	if content == "" {
		wait := true
		err = goutil.OpenInEditor(fl.path, wait)
		if err != nil {
			fmt.Println(err)
			fmt.Println("trying default application...")
			err = goutil.OpenInDefaultApp(fl.path, wait)
		}
	}
	if err != nil {
		return err
	}
	return gen.Generate(gen.GenerateFlags{Noserve: fl.noserve})
}

func Command() (goutil.CommandFlagsInit, goutil.CommandFunc) {
	f := pageFlags{}
	flagsInit := func(s *flag.FlagSet) {
		s.StringVar(&f.path, "path", "", "file to post to")
		s.StringVar(&f.title, "title", "", "if title and description are set: read content from stdin")
		s.StringVar(&f.description, "description", "", "if title and description are set: read content from stdin")
		s.BoolVar(&f.noserve, "noserve", false, "don't generate and serve afterwards")
	}
	return flagsInit, func([]string) error { return newPage(f) }
}