#!/bin/bash

# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# This sets up a Photon Controller with the tenant, project, flavors
# and image that are needed to deploy Kubernetes with kube-up.
#
# This is not meant to be used in production: it creates resource tickets
# (quotas) that are arbitrary and not likely to work in your environment.
# However, it may be a quick way to get your environment set up to try out
# a Kubernetes installation.
#
# It uses the names for the tenant, project, and flavors as specified in the
# config-common.sh file
#
# If you want to do this by hand, this script is equivalent to the following
# Photon Controller commands (assuming you haven't edited config-common.sh
# to change the names)
#
# photon target set https://192.0.2.2
# photon tenant create kube-tenant
# photon tenant set kube-tenant
# photon resource-ticket create --tenant kube-tenant --name kube-resources --limits "vm.memory 1000 GB, vm 1000 COUNT"
# photon project create --tenant kube-tenant --resource-ticket kube-resources --name kube-project --limits "vm.memory 1000 GB, vm 1000 COUNT"
# photon project set kube-project
# photon -n flavor create --name "kube-vm" --kind "vm" --cost "vm 1 COUNT, vm.cpu 1 COUNT, vm.memory 2 GB"
# photon -n flavor create --name "kube-disk" --kind "ephemeral-disk" --cost "ephemeral-disk 1 COUNT"
# photon image create kube.vmdk -n kube-image -i EAGER
#
# Note that the kube.vmdk can be downloaded as specified in the documentation.

set -o errexit
set -o nounset
set -o pipefail

setvar KUBE_ROOT = "$(dirname "${BASH_SOURCE[0]}")/../.."
# shellcheck source=./util.sh
source "${KUBE_ROOT}/cluster/photon-controller/util.sh"

proc main {
  verify-cmd-in-path photon
  set-target
  create-tenant
  create-project
  create-vm-flavor ${PHOTON_MASTER_FLAVOR} ${SETUP_MASTER_FLAVOR_SPEC}
  if test ${PHOTON_MASTER_FLAVOR} != ${PHOTON_NODE_FLAVOR} {
    create-vm-flavor ${PHOTON_NODE_FLAVOR} ${SETUP_NODE_FLAVOR_SPEC}
  }
  create-disk-flavor
  create-image
}

proc parse-cmd-line {
  setvar PHOTON_TARGET = ${1:-""}
  setvar PHOTON_VMDK = ${2:-""}

  if [[ "${PHOTON_TARGET}" = "" || "${PHOTON_VMDK}" = "" ]] {
    echo "Usage: setup-prereq <photon target> <path-to-kube-vmdk>"
    echo "Target should be a URL like https://192.0.2.1"
    echo ""
    echo "This will create the following, based on the configuration in config-common.sh"
    echo "    * A tenant named ${PHOTON_TENANT}"
    echo "    * A project named ${PHOTON_PROJECT}"
    echo "    * A VM flavor named ${PHOTON_MASTER_FLAVOR}"
    echo "    * A disk flavor named ${PHOTON_DISK_FLAVOR}"
    echo "It will also upload the Kube VMDK"
    echo ""
    echo "It creates the tenant with a resource ticket (quota) that may"
    echo "be inappropriate for your environment. For a production"
    echo "environment, you should configure these to match your"
    echo "environment."
    exit 1
  }

  echo "Photon Target: ${PHOTON_TARGET}"
  echo "Photon VMDK: ${PHOTON_VMDK}"
}

proc set-target {
  ${PHOTON} target set ${PHOTON_TARGET} > /dev/null 2>&1
}

proc create-tenant {
  local rc=0
  local output

  ${PHOTON} tenant list | grep -q "\t${PHOTON_TENANT}$" > /dev/null 2>&1 || setvar rc = ""$?
  if [[ ${rc} -eq 0 ]] {
    echo "Tenant ${PHOTON_TENANT} already made, skipping"
  } else {
    echo "Making tenant ${PHOTON_TENANT}"
    setvar rc = '0'
    setvar output = $(${PHOTON} tenant create "${PHOTON_TENANT}" 2>&1) || do {
      echo "ERROR: Could not create tenant \"${PHOTON_TENANT}\", exiting"
      echo "Output from tenant creation:"
      echo ${output}
      exit 1
    }
  }
  ${PHOTON} tenant set ${PHOTON_TENANT} > /dev/null 2>&1
}

proc create-project {
  local rc=0
  local output

  ${PHOTON} project list | grep -q "\t${PHOTON_PROJECT}\t" > /dev/null 2>&1  || setvar rc = ""$?
  if [[ ${rc} -eq 0 ]] {
    echo "Project ${PHOTON_PROJECT} already made, skipping"
  } else {
    echo "Making project ${PHOTON_PROJECT}"
    setvar rc = '0'
    setvar output = $(${PHOTON} resource-ticket create --tenant "${PHOTON_TENANT}" --name "${PHOTON_TENANT}-resources" --limits "${SETUP_TICKET_SPEC}" 2>&1) || do {
      echo "ERROR: Could not create resource ticket, exiting"
      echo "Output from resource ticket creation:"
      echo ${output}
      exit 1
    }

    setvar rc = '0'
    setvar output = $(${PHOTON} project create --tenant "${PHOTON_TENANT}" --resource-ticket "${PHOTON_TENANT}-resources" --name "${PHOTON_PROJECT}" --limits "${SETUP_PROJECT_SPEC}" 2>&1) || do {
      echo "ERROR: Could not create project \"${PHOTON_PROJECT}\", exiting"
      echo "Output from project creation:"
      echo ${output}
      exit 1
    }
  }
  ${PHOTON} project set ${PHOTON_PROJECT}
}

proc create-vm-flavor {
  local flavor_name=${1}
  local flavor_spec=${2}
  local rc=0
  local output

  ${PHOTON} flavor list | grep -q "\t${flavor_name}\t" > /dev/null 2>&1 || setvar rc = ""$?
  if [[ ${rc} -eq 0 ]] {
    check-flavor-ready ${flavor_name}
    echo "Flavor ${flavor_name} already made, skipping"
  } else {
    echo "Making VM flavor ${flavor_name}"
    setvar rc = '0'
    setvar output = $(${PHOTON} -n flavor create --name "${flavor_name}" --kind "vm" --cost "${flavor_spec}" 2>&1) || do {
      echo "ERROR: Could not create vm flavor \"${flavor_name}\", exiting"
      echo "Output from flavor creation:"
      echo ${output}
      exit 1
    }
  }
}

proc create-disk-flavor {
  local rc=0
  local output

  ${PHOTON} flavor list | grep -q "\t${PHOTON_DISK_FLAVOR}\t" > /dev/null 2>&1  || setvar rc = ""$?
  if [[ ${rc} -eq 0 ]] {
    check-flavor-ready ${PHOTON_DISK_FLAVOR}
    echo "Flavor ${PHOTON_DISK_FLAVOR} already made, skipping"
  } else {
    echo "Making disk flavor ${PHOTON_DISK_FLAVOR}"
    setvar rc = '0'
    setvar output = $(${PHOTON} -n flavor create --name "${PHOTON_DISK_FLAVOR}" --kind "ephemeral-disk" --cost "${SETUP_DISK_FLAVOR_SPEC}" 2>&1) || do {
      echo "ERROR: Could not create disk flavor \"${PHOTON_DISK_FLAVOR}\", exiting"
      echo "Output from flavor creation:"
      echo ${output}
      exit 1
    }
  }
}

proc check-flavor-ready {
  local flavor_name=${1}
  local rc=0

  local flavor_id
  setvar flavor_id = $(${PHOTON} flavor list | grep  "\t${flavor_name}\t" | awk '{print $1}') || do {
    echo "ERROR: Found ${flavor_name} but cannot find it's id"
    exit 1
  }

  ${PHOTON} flavor show ${flavor_id} | grep "\tREADY\$" > /dev/null 2>&1  || do {
    echo "ERROR: Flavor \"${flavor_name}\" already exists but is not READY. Please delete or fix it."
    exit 1
  }
}

proc create-image {
  local rc=0
  local num_images
  local output

  ${PHOTON} image list | grep "\t${PHOTON_IMAGE}\t" | grep -q ERROR > /dev/null 2>&1 || setvar rc = ""$?
  if [[ ${rc} -eq 0 ]] {
    echo "Warning: You have at least one ${PHOTON_IMAGE} image in the ERROR state. You may want to investigate."
    echo "Images in the ERROR state will be ignored."
  }

  setvar rc = '0'
  # We don't use grep -c because it exists non-zero when there are no matches, tell shellcheck
  # shellcheck disable=SC2126 
  setvar num_images = $(${PHOTON} image list | grep "\t${PHOTON_IMAGE}\t" | grep READY | wc -l)
  if [[ "${num_images}" -gt 1 ]] {
    echo "Warning: You have more than one good ${PHOTON_IMAGE} image. You may want to remove duplicates."
  }

  ${PHOTON} image list | grep "\t${PHOTON_IMAGE}\t" | grep -q READY > /dev/null 2>&1 || setvar rc = ""$?
  if [[ ${rc} -eq 0 ]] {
    echo "Image ${PHOTON_VMDK} already uploaded, skipping"
  } else {
    echo "Uploading image ${PHOTON_VMDK}"
    setvar rc = '0'
    setvar output = $(${PHOTON} image create "${PHOTON_VMDK}" -n "${PHOTON_IMAGE}" -i EAGER 2>&1) || do {
      echo "ERROR: Could not upload image, exiting"
      echo "Output from image create:"
      echo ${output}
      exit 1
    }
  }
}

# We don't want silent pipeline failure: we check for failure
set +o pipefail

parse-cmd-line @ARGV
main