#!/usr/bin/env bash

declare -r esc=$'\033'
declare -r c_reset="${esc}[0m"
declare -r c_red="${esc}[31m"

err() {
  printf "${c_red}%s${c_reset}\n" "$*" >&2
}

die() {
  [[ -n "$1" ]] && err "$1"
  exit 1
}

has() {
  local verbose=0
  if [[ $1 == '-v' ]]; then
    verbose=1
    shift
  fi
  for c; do c="${c%% *}"
    if ! command -v "$c" &> /dev/null; then
      (( verbose > 0 )) && err "$c not found"
      return 1
    fi
  done
}

openurl() {
  local url="$1"
  local browser
  case "$url" in
    *youtube.com*|*youtu.be*|*vimeo.com*)
      browser=$(select_from \
        mpv mplayer2 mplayer) ;;
    *)
      browser=$(select_from \
        -c "pgrep -u $USER -i" \
        firefox chromium-browser chrome)
      [[ ! $browser ]] && browser='w3m'
      ;;
  esac
  $browser "$url"
}

# http://stackoverflow.com/a/10660730
rawurlencode() {
  local string="$*"
  local strlen=${#string}
  local encoded=""
  for (( pos=0; pos < strlen; pos++ )); do
    c="${string:$pos:1}"
    case "$c" in
      [-_.~a-zA-Z0-9])
        o="$c" ;;
      *)
        printf -v o '%%%02x' "'$c"
    esac
    encoded+="${o}"
  done
  echo "${encoded}"
}

has -v curl jq fzf || die

if [[ -z "$*" ]]; then
  die 'nothing to search for'
fi

response=$( curl -sfL "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&rsz=8&q=$(rawurlencode "$*")" ) || die 'error connecting to google, check connection'
json=$( jq -c '.["responseData"]["results"] | map("\(.unescapedUrl) \(.title) | \(.content)") | .[]' <<< "$response" ) || die 'error parsing results :('
url=$( fzf -e --ansi --cycle --inline-info <\
  <( sed -r 's/<[^>]*>//g; s/\\n//g; s/^\s*"//; s/",?$//' <<< "$json" ) |
  cut -d' ' -f1 )

if [[ -n "$url" ]]; then
  openurl "$url"
fi