#! /bin/bash

gitlab() (
   is() {
      echo "$*" | grep -q gitlab.app && ! echo "$*" | grep -q '/wikis/'
   }

   get() {
      local project="$1"
      local blob="$2"
      project="$(urlencode "$project")"
      blob="$(urlencode "$blob")"
      local path="api/v4/projects/$project/repository/files/$blob/raw"
      _gcurl "https://gitlab-app.eng.qops.net/$path"
   }

   expand() {
      local cache_key="gitlab expand $*"
      if cache get "$cache_key"; then
         return 0
      fi
      _expand "$@" | sort | cache put "$cache_key"
   }

   _expand() {
      local url="$1"
      local project="$(_url_to_project_root "$url" | head -n 1)"
      local root="$(_url_to_project_root "$url" | tail -n 1)"
      __expand "$project" "$root"
   }

   _url_to_project_root() {
      local url="$1"
      local url_path="${url#http*://gitlab*.net/}"
      local project="${url_path%%/-/*}"
      local root="${url_path#*$project}"
      local root="${root#*/-/}"
      local root="${root#tree/}"
      local root="${root#blob/}"
      local root="${root#*/}"
      echo "$project"
      echo "$root"
   }

   __expand() {
      local project="$1"
      local root="${2:-"/"}"

      local b64_files=()
      local b64_trees=("$root")
      local i=0

      find_each() {
         local type="$1"
         shift
         echo "$*" \
            | jq -c .[] \
            | grep "\"type\":\"$type\"" \
            | jq -r .path \
            | while read -r line; do echo "$line" | base64; done \
            | grep .
      }
      while [ "$i" -lt "${#b64_trees[@]}" ]; do
         got="$(_list_tree "$project" "${b64_trees[i]}")"
         for b64_tree in $(find_each "tree" "$got"); do
            if ! echo "${b64_trees[@]}" | grep -q "[ ^]$b64_tree[ $]"; then
               b64_trees+=("$b64_tree")
            fi
         done
         for b64_file in $(find_each "blob" "$got"); do
            if ! echo "${b64_files[@]}" | grep -q "[ ^]$b64_file[ $]"; then
               b64_files+=("$b64_file")
            fi
         done
         i=$((i+1))
      done
      echo "$project" | base64
      for b64_file in "${b64_files[@]}"; do
         echo "$b64_file"
      done
   }

   _list_tree() {
      local project="$(urlencode "$1")"
      local path="/api/v4/projects/$project/repository/tree"
      local query="recursive=true&path=$2"
      _gcurl "https://gitlab-app.eng.qops.net/$path?$query"
   }

   _gcurl() {
      local cache_key="gitlab _gcurl $*"
      if cache get "$cache_key"; then
         return 0
      fi
      __gcurl "$@" | cache put "$cache_key"
   }

   __gcurl() {
      curl -sS -H "Authorization: Bearer $GITLAB_PAT" "$@"
   }

   "$@"
)

urlencode() (
    LC_COLLATE=C
    local length="${#1}"
    for (( i = 0; i < length; i++ )); do
        local c="${1:$i:1}"
        case $c in
            [a-zA-Z0-9.~_-]) printf '%s' "$c" ;;
            *) printf '%%%02X' "'$c" ;;
        esac
    done
)