#!/bin/bash

ROOT_DIR="$(git rev-parse --show-toplevel)"
DOCS_PATH="${ROOT_DIR}/docs"
COOK_PATH="${ROOT_DIR}/cook"
IMAGES_PATH="${DOCS_PATH}/assets/images"

# readonly DIR
readonly ROOT_DIR
readonly DOCS_PATH
readonly IMAGES_PATH
readonly COOK_PATH

# Check is variable is null
function is_null {
  [ -z "${1}" ]
}

# Check if command exists
function command_exists(){
  command -v "${1}" &> /dev/null
}

# Check if file exists
function file_exists(){
  [ -f "{1}" ]
}

# printf usage_error if something isn't right.
function usage_error() {
  show_usage "${1}"
  printf "\nTry %s -h for more options.\n" "${1}" >&2
  exit 1
}

function show_usage(){
  printf "Usage: %s [OPTIONS] FILENAMES\n" "${1}"
}

function show_version(){
  printf "%s version %s\n" "${1}" "${2}"; exit 0
}

function script_desc(){
  printf "%s\n\n" "${1}"
}

# Show the help
function show_help(){
  show_usage "${1}"
  script_desc "${2}"
  printf "Mandatory arguments:\n"
  printf "  FILENAME            The cook filename to move\n\n"
  printf "Options:\n"
  printf "  -h, --help          Print this Help.\n"
  printf "  -v, --version       Print script version and exit.\n"
  exit 0
}

function get_category(){
  d1=$(basename "$(dirname "${1}")")
  d2=$(basename "$(dirname "$(dirname "${1}")")")
  if [ "${d2}" == "cook" ]; then
    printf "%s\n" "${d1}"
  else
    printf "%s/%s\n" "${d2}" "${d1}"
  fi
}

function show_error(){
  printf "Could not get \`%s\`\n" "${1}"
  exit 1
}

function get_extension() {
  printf '%s\n' "${1#*.}"
}

function to_lower() {
  s="${1// /-}"
  printf '%s\n' "${s,,}"
}

function remove_extension() {
  printf '%s\n' "${1%%.*}"
}

function get_image() {
  s="${1}"
  if [ -f "${s}.jpg" ]; then
    readlink -f "${s}.jpg"
  elif [ -f "${s}.png" ]; then
    readlink -f "${s}.png"
  fi
}

function get_filename() {
  basename "${1}"
}

function get_recipe_path(){
  s=$(readlink -f "${1}")
  printf '%s\n' "${s}"
}

function get_recipe_filename(){
  get_filename "${1}"
}

function get_recipe_name(){
  recipe_filename=$(get_filename "${1}")
  remove_extension "${recipe_filename}"
}

function get_markdown_path(){
  recipe_name=$(get_recipe_name "${1}")
  category=$(get_category "${1}")
  lower=$(to_lower "${recipe_name}")
  readlink -f "${COOK_PATH}/${category}/${lower}.md"
}

function get_image_path(){
  category=$(get_category "${1}")
  recipe_name=$(get_recipe_name "${1}")
  get_image "${COOK_PATH}/${category}/${recipe_name}"
}

function get_new_image_path(){
  recipe_name=$(get_recipe_name "${1}")
  lower=$(to_lower "${recipe_name}")
  image_path=$(get_image_path "${1}")
  image_extension=$(get_extension "${image_path}")
  printf "%s/%s.%s" "${IMAGES_PATH}" "${lower}" "${image_extension}"
}

function get_new_markdown_path(){
  recipe_name=$(get_recipe_name "${1}")
  category=$(get_category "${1}")
  lower=$(to_lower "${recipe_name}")
  printf "%s/%s/%s.md" "${DOCS_PATH}" "${category}" "${lower}"
}

function debug_print(){
  recipe_path=$(get_recipe_path "${1}")
  printf "recipe_path: %s\n" "${recipe_path}"
  printf "category: %s\n" "$(get_category "${recipe_path}")"
  printf "recipe_filename: %s\n" "$(get_filename "${recipe_path}")"
  printf "recipe_name: %s\n" "$(get_recipe_name "${recipe_path}")"
  printf "markdown_path: %s\n" "$(get_markdown_path "${recipe_path}")"
  printf "image_path: %s\n" "$(get_image_path "${recipe_path}")"
  printf "new_image_path: %s\n" "$(get_new_image_path "${recipe_path}")"
  printf "new_markdown_path: %s\n" "$(get_new_markdown_path "${recipe_path}")"
}

function do_checks(){
  filename=$(get_filename "${1}")
  file_extension=$(get_extension "${filename}")
  if ! [ "${file_extension}" == "cook" ]; then
    printf "File extension is not \`cook\`, %s\n" "${filename}"
    exit 1
  fi
  test -f "${1}" || (printf "File does not exist, %s\n" "${1}" && exit 1)
  mime_type=$(get_mime_type "${1}")
  if ! [ "${mime_type}" == "text/plain" ]; then
    printf "Mime type is not \`tex/plain\`, %s\n" "${mime_type}"
    exit 1
  fi
}

function get_mime_type(){
  file -b --mime-type "${1}"
}