package lib

import (
	"encoding/json"
	"errors"
	"html/template"
	"os"
	"path"
	"strings"
)

const CONTENT_PATH string = "content"

type Content struct{
  Dir string
  Name string

  Title string    `json:"title"`
  ID string       `json:"id"`

  Md string    
  HTML template.HTML 

  Date string     `json:"date"`
  Author string   `json:"author"`
}

func ListContent(dir string) ([]Content, error) {
  var res []Content

  dirpath := path.Join(CONTENT_PATH, dir)
  entries, err := os.ReadDir(dirpath)
  if err != nil {
    return nil, errors.New("Cannot readdir: "+dirpath) 
  }

  for _, e := range entries {
    if(!strings.HasSuffix(e.Name(), ".json")) {
      continue
    }

    var con Content
    jsonfile := path.Join(dirpath, e.Name())
    jsoncon, err := os.ReadFile(jsonfile)

    if err != nil {
      return nil, errors.New("Cannot get JSON: "+jsonfile)
    }

    err = json.Unmarshal(jsoncon, &con)
    if err != nil {
      return nil, errors.New("Cannot parse JSON: "+jsonfile)
    }

    con.Dir = dir
    con.Name = strings.Split(e.Name(), ".")[0]
    res = append(res, con)
  }

  return res, nil
}

func GetContent(dir string, name string) (Content, error) {
  var res Content
  jsonfile := path.Join(CONTENT_PATH, dir, name+".json")
  mdfile := path.Join(CONTENT_PATH, dir, name+".md")

  res.Dir = dir
  res.Name = name

  jsoncontent, err := os.ReadFile(jsonfile)
  if err != nil {
    return res, errors.New("Cannot read JSON file: "+jsonfile)
  }

  rawcontent, err := os.ReadFile(mdfile)
  if err != nil {
    return res, errors.New("Cannot read markdown file: "+mdfile)
  }

  if(json.Unmarshal(jsoncontent, &res)!= nil) {
    return res, errors.New("Cannot parse JSON: "+jsonfile)
  }

  res.Md = string(rawcontent)
  res.HTML = template.HTML(ParseMarkdown(res.Md)) 
  return res, nil
}