// Copyright 2016 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Package create provides functions to create new content.
package create

import (
	"bytes"
	"os"
	"os/exec"
	"path/filepath"

	"github.com/gohugoio/hugo/helpers"
	"github.com/gohugoio/hugo/hugolib"
	jww "github.com/spf13/jwalterweatherman"
)

// NewContent creates a new content file in the content directory based upon the
// given kind, which is used to lookup an archetype.
func NewContent(s *hugolib.Site, kind, targetPath string) error {
	jww.INFO.Println("attempting to create ", targetPath, "of", kind)

	archetypeFilename := findArchetype(s, kind)

	var (
		content []byte
		err     error
	)

	content, err = executeArcheTypeAsTemplate(s, kind, targetPath, archetypeFilename)
	if err != nil {
		return err
	}

	contentPath := s.PathSpec.AbsPathify(filepath.Join(s.Cfg.GetString("contentDir"), targetPath))

	if err := helpers.SafeWriteToDisk(contentPath, bytes.NewReader(content), s.Fs.Source); err != nil {
		return err
	}

	jww.FEEDBACK.Println(contentPath, "created")

	editor := s.Cfg.GetString("newContentEditor")
	if editor != "" {
		jww.FEEDBACK.Printf("Editing %s with %q ...\n", targetPath, editor)

		cmd := exec.Command(editor, contentPath)
		cmd.Stdin = os.Stdin
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr

		return cmd.Run()
	}

	return nil
}

// FindArchetype takes a given kind/archetype of content and returns an output
// path for that archetype.  If no archetype is found, an empty string is
// returned.
func findArchetype(s *hugolib.Site, kind string) (outpath string) {
	search := []string{s.PathSpec.AbsPathify(s.Cfg.GetString("archetypeDir"))}

	if s.Cfg.GetString("theme") != "" {
		themeDir := filepath.Join(s.PathSpec.AbsPathify(s.Cfg.GetString("themesDir")+"/"+s.Cfg.GetString("theme")), "/archetypes/")
		if _, err := s.Fs.Source.Stat(themeDir); os.IsNotExist(err) {
			jww.ERROR.Printf("Unable to find archetypes directory for theme %q at %q", s.Cfg.GetString("theme"), themeDir)
		} else {
			search = append(search, themeDir)
		}
	}

	for _, x := range search {
		// If the new content isn't in a subdirectory, kind == "".
		// Therefore it should be excluded otherwise `is a directory`
		// error will occur. github.com/gohugoio/hugo/issues/411
		var pathsToCheck []string

		if kind == "" {
			pathsToCheck = []string{"default.md", "default"}
		} else {
			pathsToCheck = []string{kind + ".md", kind, "default.md", "default"}
		}
		for _, p := range pathsToCheck {
			curpath := filepath.Join(x, p)
			jww.DEBUG.Println("checking", curpath, "for archetypes")
			if exists, _ := helpers.Exists(curpath, s.Fs.Source); exists {
				jww.INFO.Println("curpath: " + curpath)
				return curpath
			}
		}
	}

	return ""
}