#!/usr/bin/env bash
source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
source "$PLUGIN_CORE_AVAILABLE_PATH/common/property-functions"
set -eo pipefail
[[ $DOKKU_TRACE ]] && set -x

cmd-git-allow-host() {
  declare desc="adds a host to known_hosts"
  local cmd="git:allow-host"
  [[ "$1" == "$cmd" ]] && shift 1
  declare HOST="$1"
  [[ -z "$HOST" ]] && dokku_log_fail "Please supply a git host"

  ssh-keyscan -t rsa "$HOST" >> "$DOKKU_ROOT/.ssh/known_hosts"
  dokku_log_info1 "$HOST added to known hosts"
}

cmd-git-sync() {
  declare desc="clone or fetch an app from remote git repo"
  local cmd="git:sync"
  [[ "$1" == "$cmd" ]] && shift 1
  declare APP GIT_REMOTE GIT_REF FLAG

  ARGS=()
  for arg in "$@"; do
    if [[ "$arg" == "--build" ]]; then
      FLAG="--build"
      continue
    fi

    ARGS+=("$arg")
  done

  APP="${ARGS[0]}"
  GIT_REMOTE="${ARGS[1]}"
  GIT_REF="${ARGS[2]}"

  verify_app_name "$APP"

  if [[ -z "$GIT_REMOTE" ]]; then
    dokku_log_fail "Missing GIT_REMOTE parameter"
    return
  fi

  local APP_ROOT="$DOKKU_ROOT/$APP"
  if [[ "$(git -C "$APP_ROOT" count-objects)" == "0 objects, 0 kilobytes" ]]; then
    fn-git-clone "$APP" "$GIT_REMOTE" "$GIT_REF"
  else
    fn-git-fetch "$APP" "$GIT_REMOTE" "$GIT_REF"
  fi

  if [[ "$FLAG" == "--build" ]]; then
    if [[ -n "$GIT_REF" ]]; then
      GIT_REF="$(git -C "/home/dokku/$APP" rev-parse "$GIT_REF")"
      plugn trigger receive-app "$APP" "$GIT_REF"
    else
      plugn trigger receive-app "$APP"
    fi
  fi
}

cmd-git-public-key() {
  declare desc="outputs the dokku public deploy key"
  local cmd="git:public-key"
  [[ "$1" == "$cmd" ]] && shift 1

  if [[ ! -f "$DOKKU_ROOT/.ssh/id_rsa.pub" ]]; then
    dokku_log_fail "There is no deploy key"
  fi
  cat "$DOKKU_ROOT/.ssh/id_rsa.pub"
}

cmd-git-report() {
  declare desc="displays a git report for one or more apps"
  declare cmd="git:report"
  [[ "$1" == "$cmd" ]] && shift 1
  declare APP="$1" INFO_FLAG="$2"
  local INSTALLED_APPS=$(dokku_apps)

  if [[ -n "$APP" ]] && [[ "$APP" == --* ]]; then
    INFO_FLAG="$APP"
    APP=""
  fi

  if [[ -z "$APP" ]] && [[ -z "$INFO_FLAG" ]]; then
    INFO_FLAG="true"
  fi

  if [[ -z "$APP" ]]; then
    for app in $INSTALLED_APPS; do
      cmd-git-report-single "$app" "$INFO_FLAG" | tee || true
    done
  else
    cmd-git-report-single "$APP" "$INFO_FLAG"
  fi
}

cmd-git-report-single() {
  declare APP="$1" INFO_FLAG="$2"
  local APP_DIR="$DOKKU_ROOT/$APP"
  if [[ "$INFO_FLAG" == "true" ]]; then
    INFO_FLAG=""
  fi
  verify_app_name "$APP"
  local flag_map=(
    "--git-deploy-branch: $(fn-plugin-property-get "git" "$APP" "deploy-branch" "master")"
    "--git-global-deploy-branch: $(fn-plugin-property-get "git" "--global" "deploy-branch" "master")"
    "--git-keep-git-dir: $(fn-plugin-property-get "git" "$APP" "keep-git-dir" "false")"
    "--git-rev-env-var: $(fn-plugin-property-get "git" "$APP" "rev-env-var" "GIT_REV")"
    "--git-sha: $(git -C "$APP_DIR" rev-parse --short HEAD 2>/dev/null || false)"
    "--git-last-updated-at: $(fn-git-last-updated-at "$APP")"
  )

  if [[ -z "$INFO_FLAG" ]]; then
    dokku_log_info2_quiet "${APP} git information"
    for flag in "${flag_map[@]}"; do
      key="$(echo "${flag#--}" | cut -f1 -d' ' | tr - ' ')"
      dokku_log_verbose "$(printf "%-30s %-25s" "${key^}" "${flag#*: }")"
    done
  else
    local match=false
    local value_exists=false
    for flag in "${flag_map[@]}"; do
      valid_flags="${valid_flags} $(echo "$flag" | cut -d':' -f1)"
      if [[ "$flag" == "${INFO_FLAG}:"* ]]; then
        value=${flag#*: }
        size="${#value}"
        if [[ "$size" -ne 0 ]]; then
          echo "$value" && match=true && value_exists=true
        else
          match=true
        fi
      fi
    done
    [[ "$match" == "true" ]] || dokku_log_fail "Invalid flag passed, valid flags:${valid_flags}"
    [[ "$value_exists" == "true" ]] || dokku_log_fail "not deployed"
  fi
}

fn-git-create-hook() {
  declare APP="$1"
  local APP_PATH="$DOKKU_ROOT/$APP"
  local PRERECEIVE_HOOK="$APP_PATH/hooks/pre-receive"

  if [[ ! -d "$APP_PATH/refs" ]]; then
    git init -q --bare "$APP_PATH" >/dev/null
  fi

  cat >"$PRERECEIVE_HOOK" <<EOF
#!/usr/bin/env bash
set -e
set -o pipefail

cat | DOKKU_ROOT="$DOKKU_ROOT" dokku git-hook $APP
EOF
  chmod +x "$PRERECEIVE_HOOK"
}

fn-git-clone() {
  declare desc="creates an app from remote git repo"
  declare APP="$1" GIT_REMOTE="$2" GIT_REF="$3"
  local APP_CLONE_ROOT="$DOKKU_LIB_ROOT/data/git/$APP"
  local APP_ROOT="$DOKKU_ROOT/$APP"
  [[ -z "$APP" ]] && dokku_log_fail "Please specify an app to run the command on"

  if [[ "$(git -C "$APP_ROOT" count-objects)" != "0 objects, 0 kilobytes" ]]; then
    dokku_log_fail "The clone subcommand can only be executed for new applications"
  fi

  if [[ -d "$APP_CLONE_ROOT" ]]; then
    dokku_log_fail "Clone in progress"
  fi

  if [[ -z "$GIT_REF" ]]; then
    GIT_REF="$(fn-git-deploy-branch "$APP")"
  fi

  dokku_log_info1_quiet "Cloning $APP from $GIT_REMOTE#$GIT_REF"
  trap 'rm -rf $APP_CLONE_ROOT > /dev/null' RETURN INT TERM EXIT

  is_ref=true
  git clone --depth 1 -n -qq --branch "$GIT_REF" "$GIT_REMOTE" "$APP_CLONE_ROOT" 2>/dev/null && is_ref=false
  rm -rf "$APP_CLONE_ROOT"

  if [[ "$is_ref" == "true" ]]; then
    git clone -n -qq "$GIT_REMOTE" "$APP_CLONE_ROOT" 2>/dev/null
    git -C "$APP_CLONE_ROOT" checkout -qq "$GIT_REF"
  else
    git clone -n -qq --branch "$GIT_REF" "$GIT_REMOTE" "$APP_CLONE_ROOT" 2>/dev/null
    if git -C "$APP_CLONE_ROOT" show-ref --verify "refs/heads/$GIT_REF" >/dev/null 2>&1; then
      dokku_log_verbose "Detected branch, setting deploy-branch to $GIT_REF"
      fn-plugin-property-write "git" "$APP" "deploy-branch" "$GIT_REF"
    fi
  fi

  DOKKU_DEPLOY_BRANCH="$(fn-git-deploy-branch "$APP")"
  if [[ "$GIT_REF" != "$DOKKU_DEPLOY_BRANCH" ]]; then
    if [[ "$is_ref" == "true" ]]; then
      git -C "$APP_CLONE_ROOT" branch -qq -D "$DOKKU_DEPLOY_BRANCH" 2>/dev/null || true
    fi
    git -C "$APP_CLONE_ROOT" checkout -qq -b "$DOKKU_DEPLOY_BRANCH"
  fi

  rsync -a "$APP_CLONE_ROOT/.git/" "$APP_ROOT"
  fn-git-create-hook "$APP"
}

fn-git-fetch() {
  declare APP="$1" GIT_REMOTE="$2" GIT_REF="$3"
  local DOKKU_DEPLOY_BRANCH
  local APP_ROOT="$DOKKU_ROOT/$APP"

  if [[ "$(git -C "$APP_ROOT" count-objects)" == "0 objects, 0 kilobytes" ]]; then
    dokku_log_fail "The fetch subcommand can only be executed for existing applications"
  fi

  DOKKU_DEPLOY_BRANCH="$(fn-git-deploy-branch "$APP")"
  if ! git -C  "$APP_ROOT" check-ref-format --branch "$DOKKU_DEPLOY_BRANCH" >/dev/null 2>&1; then
    echo $'\e[1G\e[K'"-----> WARNING: Invalid branch name '$DOKKU_DEPLOY_BRANCH' specified via DOKKU_DEPLOY_BRANCH."
    echo $'\e[1G\e[K'"-----> For more details, please see the man page for 'git-check-ref-format.'"
    return
  fi

  git -C  "$APP_ROOT" remote rm remote > /dev/null 2>&1 || true
  git -C  "$APP_ROOT" remote add --mirror=fetch --no-tags remote "$GIT_REMOTE"
  if [[ -z "$GIT_REF" ]]; then
    git -C  "$APP_ROOT" fetch --update-head-ok remote "$DOKKU_DEPLOY_BRANCH"
  else
    git -C  "$APP_ROOT" fetch --update-head-ok remote
    git -C  "$APP_ROOT" update-ref "refs/heads/$DOKKU_DEPLOY_BRANCH" "$GIT_REF"
  fi
}

fn-git-last-updated-at() {
  declare desc="retrieve the deploy branch for a given application"
  declare APP="$1"
  local DOKKU_DEPLOY_BRANCH="$(fn-git-deploy-branch "$APP")"
  local HEAD_FILE="/home/dokku/$APP/refs/heads/$DOKKU_DEPLOY_BRANCH"

  if [[ -f "$HEAD_FILE" ]]; then
    stat -c %Y "$HEAD_FILE"
  fi
}

fn-git-deploy-branch() {
  declare desc="retrieve the deploy branch for a given application"
  local APP="$1"
  local DEFAULT_BRANCH="${2-master}"

  local DOKKU_DEPLOY_BRANCH="$(fn-plugin-property-get "git" "$APP" "deploy-branch" "")"
  local DOKKU_GLOBAL_DEPLOY_BRANCH="$(fn-plugin-property-get "git" "--global" "deploy-branch" "")"
  if [[ -n "$DOKKU_DEPLOY_BRANCH" ]]; then
    echo "$DOKKU_DEPLOY_BRANCH"
  elif [[ -n "$DOKKU_GLOBAL_DEPLOY_BRANCH" ]]; then
    echo "$DOKKU_GLOBAL_DEPLOY_BRANCH"
  else
    echo "$DEFAULT_BRANCH"
  fi
}